China Supal (Changzhou) Precision Tools Co.,Ltd Company News

Now the energy industry has become a hot topic, and development has always attracted much attention. In addition to the traditional energy industry, emerging clean energy sources such as wind power, nuclear power, solar energy and tidal energy are increasingly valued by people. The rapid development of the energy industry has also put forward higher requirements for its related manufacturing industries. Among them, the tool is the tool is that the tool is the tool. One of the most critical factors is that under the premise of ensuring the quality and production efficiency of processing, we must care about how to choose a knife that should choose to choose for ourselves for the energy industry, especially the new energy industry. Use interpretation and induction to obtain the most suitable product The choice of tools is a very logical job. Each new project is like a reasoning question. You need to use interpretation and induction to get the most suitable products. In short, it is a process of continuous demolition and integration. The client's parts are very specific. You must demolish this thing as small as possible, detailed attributes, and each attribute has an impact on the design of the tool. To summarize these impacts Essence For example, the processing of turbine blades, fan blades molds, a 5MW fan, its leaves can reach 60m long and 5m wide, the corresponding mold is also a big guy: from geometric perspective, large volume requires the quickly to remove the margin to remove the balance quickly. In Iska products, there are fast -metal cutting products such as the FEEDMILL series of tools under high -speed fees and interpolation and milling cutters. To remove the balance quickly, you must reduce the cutting resistance; when the long suspension is extended, it is easy to produce vibration. It is required that the cutting blade has strong impact resistance and good toughness; there is a space surface on the blades, and the knife is required to have arc elements. In summary, the following results can be obtained: Feedmill fast plane milling, cavity rough processing, Millshred for deep cavity and rough processing, and then use a round blades to process cavity. Another example is the blade of the turbine turbine. The leaves used in the high temperature and high voltage of the steam turbine at the thermal power station are all high -temperature alloys. Toughness, so the cutting force is large, and the cutting temperature is high. The cutting resistance is reflected in the design of the tool, and the cutting force needs to be reduced by increasing the front corner and the rear corner of the tool; inhibiting the impact of the cutting temperature, the relevant results can be obtained through the knowledge of the knife coating. The thermal conductivity of the blade (tool) to slow down the impact of the temperature. Its role is like a layer of thermal film, because it has a thermal conductivity coefficient that is much lower than the tool substrate and workpiece material. For high -temperature alloys, Iska's SPS82C and IC380 are all PVD and nitrogen carbide coating for this difficult processing material. There is a universal characteristic of the energy industry's parts. The material material is characterized by the processing of steel, stainless steel and high -temperature alloy. Iska has proposed the concept of FMR (FastMetalworkRemoval) at a very early days. And complete product lines can meet the processing of large workpieces. Beginning in 2009, Iska has an upgrade of Helido for milling products. In short, it is the double -sided of the blade. The direct result is that the number of cutting blades can be 2 times on a blade. At the same time, the dough blade is located through the tunnel -tail blade, a larger cutting front corner, a small negative edge of the blade, we can well increase the life of the blade, and the Helido product will be a direction for the main promotion in the future. In addition to the improvement of coating, except for SPS82C and IC380, which are two special products for high -temperature alloys, all coatings have the corresponding SUMO (speed demon) technology upgrade. On the basis of ordinary PVD and CVD coating, plus a layer of alumina, the surface of the blade mouth is smoother, reducing the formation of dandruff tumors, and increasing the life of the tool. From the beginning of research and development to actual sales, for conventional metal processing, in the comparison of the old products of Iska itself, the life expectancy increased by 10%to 30%. For non -metallic materials in the wind power industry, such as glass fiber, carbon fiber, and synthetic resin, Iska's poly crystal diamond knife (we call "PCDLINE") It has been proven to effectively prevent scales, damage, and crushing. These tools have common keywords: sharp blade, large front corners, front knife surface polishing, high -speed cutting, and small dandruff. Shan Gao helps you stimulate infinite wind energy In the process of the development of the new energy industry, Wind Energy, as a clean renewable energy source, is becoming more and more valued by countries around the world. European countries, the United States, and China have given strong support and promotion in their own energy planning. In the process of the development of the new energy industry, Wind Energy, as a clean renewable energy source, is becoming more and more valued by countries around the world. European countries, the United States, and China have given strong support and promotion in their own energy planning. As a leader in the wind power industry, Shan Gao knife can not only provide high -quality tools and professional processing technologies, but also always focus on providing overall solutions for metal cutting demand. In the long -term cooperation with famous fan component manufacturers in various countries in the world, the mountain height has accumulated rich experience and strictly meets the almost "harsh" processing requirements of wind power parts manufacturers. There are many factors such as fatigue, reliability, and vibration resistance from fatigue, reliability and vibration. For wind turbines, gear boxes, wind wheel hubs, wind power bearing (rotary support and gear), fan shafts, and wind turbine seats are extremely important working components. At the same time, they are also parts with high processing difficulty, high accuracy requirements, and large processing volume. Shan Gao provides a series of process solutions for this to help users in the wind power industry stand out in the fierce market competition. Wind power gear box is one of the important parts of the wind power unit. Because the operating conditions of the wind turbine are complicated, reliability, and the requirements of service life, the gear box must have sufficient rigidity, suitable support structure and wall thickness to meet complex stressive needs. Common materials include ball and ink cast iron and other high -intensity cast iron. The mechanical structure of the gear box is complex and huge, which requires hundreds of hours of precision processing. Parts are more processing. The types of machine processing of wind power gear box include milling (corn mills and three -sided blades), drilling (Perfomax series), and ravioli (bridge board 镗 风). It is worth mentioning that the diameter of the gear box connection holes exceeds 2m, and its tolerance requirements are H7. This processing is quite difficult. The mountain height Graflex bridge -type bull -headed standard products cover the size of 204 ~ 2155mm in diameter; giant (JUMBO) bridge plate hoe, the maximum diameter can reach 3200mm. They are composed of high -strength aluminum alloy and steel parts interface, taking into account the needs of flexibility, knife weight and rigidity. The accuracy requirements of maximum IT5 and RA0.6 in the essence of the essence, the size adjustment is also very convenient, which can be completed directly on the machine tool. At the same time, the modular design can also meet the needs of large diameter rounds and backbone. For example, the A731001JUMBO bridge-panel-type knife is rough with TCMT16T308-F2TK2000 blade. The cutting line speed is 150m/min, the feed speed VF reaches 25mm/min, and the depth AP is 5 ~ 6mm. The essence uses CCMT09T304-F2TK1000 blade, the cutting line speed is 120m/min, and the depth AP0.3mm is cut. These high -performance cutting parameters can ensure that customers have high component accuracy, but also greatly reduce the production cycle of customers. The wheels are also one of the important parts of the wind turbine. Its structure and force deformation are complicated. It will directly affect the normal operation and service life of the wind turbine. Therefore, it has the characteristics of high strength, good reliability, long fatigue life, and strong vibration resistance to meet the use conditions of -20 ° C ~ 40 ° C. Common materials are low -temperature low temperature and high shock tough iron iron. The main machine processing types of the wheels are milling and drilling. The wind wheel is huge, and the general processing cycle is long. A customer once encountered such a processing problem: Although all its machine tools were running at full load, production tasks could not be completed on time. In order to help customers cross the difficulty, Shanzhong designed a non-standard convertible formed tool with a diameter of 360mm and R85mm, supplemented by 335.19-1207en2R85-D09, F40M blade, and the cutting line speed is 200m/min. The quantity FZ0.14mm, cutting depth AP1 ~ 2mm, production efficiency is greatly improved, the production cycle of this wheel hub is shortened from the original 30H to within 16H. Customers were able to deliver smoothly to avoid major losses. DoubleOCTOMILL double -sided blade R220.48 plane milling cutter is very suitable for wheel milling and processing. The blade of the double -sided blade milling cutter is designed with a positive front angle. Each blade has 16 cutting blades. The same milling cutter can meet the application occasions of coarse and precise processing, and has imperative economy and generalality. The processing of wind power parts also includes a fan spindle, fan base, connecting flange, fan tower, planetary rack, fan blades, etc. For the processing of these parts, the mountain height has a solution for complete turning, milling and hole processing. Shan Gao's tools adhere to the concept of "becoming a strategic partner of customers" and are committed to improving the efficiency and competitiveness of processing for customers. "High energy processing" becomes the focus The eye -catching development of China's economy is continuing, and it is not exaggerated to describe it with supply. Railway networks and buildings are required to be inadequate. However, if a large number of mechanical equipment is introduced, the investment costs will be very large. Recently, customers have increasingly increased the requirements for "high energy production" and "high -efficiency production" on existing equipment. Because the temperature of the generator's blades is very high during operation, the materials are mostly used for heat alloys. In addition, due to its complicated shapes, not only the tools, drills and vertical milling cutters, etc., are used during processing. Sumitomo Electric hard alloy is difficult to cut materials in the car blade. The material AC500 series is used. There are difficult to cut materials in the drill bit to process a multi -purpose drill MD. With inventory, the corresponding size is quite rich, which can fully meet the requirements of the complex processing of customers. The above -mentioned tools are all special materials developed for the difficulty of processing, so they can exert excellent performance in terms of wear resistance and laugher -resistant blade. The eye -catching development of China's economy is continuing, and it is not exaggerated to describe it with supply. Railway networks and buildings are required to be inadequate. However, if a large number of mechanical equipment is introduced, the investment costs will be very large. Recently, customers have increasingly increased the requirements for "high energy production" and "high -efficiency production" on existing equipment. Therefore, the recommendation scheme of Sumitomo Electrician hard alloy is the following products with "high energy processing" as the following products. Drivery processing: Ultra -high advances greater than f = 0.5mm/r are recommended to process dandruff processing excellent high -energy break -breaking groove series SE and GE types when processing is recommended. When the request is higher (~ 0.8mm/R), the light -edged blade type LUW type and Guw type are recommended. Milling processing: It is recommended to use the MS1400 type of high -advancement and milling cutter. Although the depth cannot be greater than 1.5mm, the feed can be corresponding to 2mm/blade. Drilling processing: The newly developed J -shaped horizontal blade repair improves dandruff treatment. Coupled with a special crumb groove shape, it can also exert excellent dandruff discharge when processing. In addition, because the latest PVD coatings and DEX coatings are used, it has achieved long life. Here is a hard alloy multi -purpose drill GS/HGS type. If the aperture is more than 12.5mm, it is recommended to use the sword head -replaceable drill bit SMD type. High -hardness material processing During the high -speed/high -energy rate processing of high -hardness materials, there are 4 coating CBN materials according to different uses. BNC100 is recommended during high -speed/continuous processing, BNC160 is recommended during weak interruption, BNC200 is recommended during high energy processing, and BNC300 is recommended during interrupted processing. In addition, the high -push is recommended during processing or high -precision processing. The rotary supporting ring is a more representative difficult part in wind power components. According to the capacity (size) of the wind turbine, its size is also diverse, and the rotation support ring with a diameter of more than 2m is particularly difficult to process. In particular, the processing accuracy when processing (hard vehicle) after quenching (hard car) requires strict processing, the knife life is short, and there are many installation holes. The first recommendation of the bearing surface after quenching (Hardturning) is excellent wear resistance and can correspond to the BNC160 that can be processed by large -scale workpieces. If there are high -speed processing requirements, it is recommended to use BNC100. The company prepares three types of blades for various CBN materials, which can choose the most suitable blade port according to the degree of damage of the tool and the required surface roughness. Installed hole processing The installation holes of the rotary support ring are generally about φ25mm, and the hole depth is about 100mm. When processing these holes, it is recommended to use the WDX type on the right. Each blade has 4 blade corners that can be used in good economy, and the most suitable blade broken dandruff groove is also good when processing L/D = 5 deep pores. However, if the accuracy requirements of the hole are less than ± 0.15mm, the aforementioned SMD type is recommended.

Some general guidelines for choosing a solid carbide end mill based on industry recommendations: 1. Consider the material being machined: Different materials require different cutting speeds, feeds, and coatings. For example, a high-speed steel end mill may work well for aluminum, but a carbide end mill is better suited for machining steel. 2. Choose the right flute geometry: The flute geometry of the end mill affects chip evacuation, tool life, and surface finish. For roughing operations, a higher flute count and roughing geometry are recommended. For finishing operations, a lower flute count and finishing geometry are preferred. 3. Select the appropriate coating: Coatings such as TiN, TiCN, and TiAlN can extend tool life by reducing wear and increasing lubricity. However, the coating should be selected based on the material being machined and the specific application. 4. Determine the required tool diameter and length: The tool diameter and length should be selected based on the size of the features being machined and the rigidity of the machine tool. 5. Consider the manufacturer's reputation: Choose a reputable manufacturer that produces high-quality end mills with consistent performance and reliable delivery. Overall, it is important to carefully consider the specific requirements of the machining operation when selecting a solid carbide end mill.

High -speed milling (HSM) and high -efficiency energy milling (HPM) processing concept Example: Roughly processing hard steel, material hardness> 55HRC The application range of high -speed milling Diameter (according to the geometric size and accuracy of the workpiece) Type (rough processing, precision processing, slot, 3D contour, edge processing ...) Shape (Ball knife, round nose knife, multi -blade milling cutter ...) Materials (high -speed steel, hard alloy, metal ceramics, diamond, cubic boron nitride CBN) Knife coating (TIN, TICN, Tialn ...) Quality (radial beating, shape accuracy, dynamic balance, rigid) 2. High -speed spindle In fact, the high -speed main shaft is like the engine high speed and high power in the F1 car. The spindle can be divided into two specifications:

In order to ensure the welding quality, the welding knife should be carefully checked to find out the cause of the defects to improve. Before the inspection, the car knife should be sprayed or gently grinds the welds and impurities attached to the surface of the blade, and washed with kerosene. The inspection items and requirements are as follows: 1. Check the intensity of welds: Use a green carbonic silicon wheel to grind the back of a car knife, check the thickness of the welded layer, and the thickness requirements are below 0.15 mm. There is no shortage of pores and welds at the bottom surface of the knife tip support. The welds that are not filled with welds should not be more than 10%of the total length of the weld. If there is a hole, the blade will fall off when cutting. 2. Check the position of the blade in the knife groove: such as the stipulation of blade misplaced and sagging exceeding the technical conditions. 3. Check the welding intensity: Use a wooden hammer or copper hammer to hit the blade with a medium force, or to knock on the knife with a hammer with a hammer. Check the welding intensity of the blade, not necessarily check them one by one, and also adopt a random inspection method. Fourth, check the flatness of the blade: If there is a clear pit on the blade, it means that the blade is overheated and deforms, and the new blade should be burned. V. Check the crack: After the blade is cleaned by the kerosene, if the blade has a crack. The kerosene will penetrate into the crack and the black line appears. You can observe it with the naked eye. You can also observe 10-40 times the magnifying glass. Check the blade cracks, and you can also use color detecting method: 65%of kerosene, 30%transformer oil, and 5%pine oil -made solution are adjusted, and some sultan reds are slightly added. Place the car blade and blade in the solution for 10-15 minutes, then wash it with water, apply a layer of white soil (kaolin), and observe the surface after baking. It is revealed, and you can see it with the naked eye. The blade with cracks cannot be used, and it needs to be welded

Although the proportion of high -speed steel occupation is reduced in the consumption of tool materials, high -speed steel has a relative advantage in the threaded knife. In 2007, various types of tool consumption of various types of tools in the world, high -speed steel tools accounted for 38%, hard alloy knives accounted for 62%, and the medium threaded tools accounted for 18%of the total tool consumption. Among the threaded tools, high -speed steel materials accounted for To 95%. High -speed steel materials and knives are specially valued by high -speed steel for taps, and they are divided into high -speed steel for high -speed steel to develop and use. In addition to continuously improved the original steel number to gain morality, tap public high -speed steel is also launched, such as the International River, such as the International River. Metallurgical technology has HYTM2 and TV3 steel, French Erasteel gets GV3, Japan Nachi has HMT12 steel. After testing Germany, Japan, and South Korea, the invention of taps. Foreign tap materials are M35 (ie, W6MO5CR4V2CO5) or GV3, M3 (ie W6MO5CR4V3) and other cobalt -containing high -performance high -performance high -performance high -performance high -speed steel and powder high -speed steel. The materials are still based on the traditional technology of high -speed steel M2 (ie W6MO5CR4V2). This article discusses the production of M2, M3, and M35 high -speed steel for domestic traditional craftsmanship. The hardness and red hardness of the high -speed steel, the strength of the bending strength, and the cutting of these materials are cut into the cutting function. The tap is different under the premise of the geometric parameters and cutting of the specific products in this article.

Non -standard tools are a collective name for all non -standard knives, including non -standard car knives, knife, milling cutter, re -knife, knife, etc. Through these non -standard design For processing characteristics, we can also customize non -coating tools. During the customization process, the non -standard knife has encountered the problem of surface roughness. It can be achieved by changes in the geometric angle of the blade part. If the degree of the front and rear angles can be increased significantly, it will significantly improve the surface roughness of the workpiece. Non -standard tools can meet the production needs of different workpieces and have significant significance for mechanical production. There are several types of surface defects in design and production. The following editors will list one or two, and attach the reasons and solutions, hoping to help reference. 1. Circular ripple Reason: During the cutting process, the cut force changes greatly, and the work of pulling the knife is unobstructed, which causes the knife teeth to cut uneven cutting in the direction of the circle. Solution: Check whether the width of the blade is uniform and small, etc., especially the processing accuracy of the first seven or eight blade teeth of the school's quasi -department. From the perspective of use, the pulling speed should not be too high; the accuracy and stiffness of the bed should be good, and the phenomenon of tremor does not produce; whether the bending of the knife is super worse and the radial beating. 2. Blade grind Reason: The general wear volume VB needs to be grinded when it exceeds 0.3mm. Solution: During heavy grinding, it is generally performed on a dedicated grinding bed. For the shorter knife, it can also be grinded along the front knife surface with a disc wheel of the universal tool grinding machine. 3. Scratch Reason: Slightly. Solution: Check whether there is a gap in the injury of the knife tooth blade; whether the dandruff on the cutting teeth (especially the fine teeth) is not cleaned; The smooth steps are squeezed out of the non -smooth scroll. Surgery and scratching processing surfaces. 4. Squeeze the point Reason: Caused by severe squeezing friction between the rear knife surface and the processed surface. Solution: Adopt a well -performed cutting fluid, sufficient pouring, and proper heat treatment of workpieces with high hardness to reduce its hardness to eliminate this defect.

The characteristics, use, and type of commonly used re -re -cutting Characteristics of the re of the re-re-blade: The pillar is the cutting of the puppets, and the re-blade is cut in 4-8 blade, so the efficiency is high), the high-precision, and the hinge blade mouth with the blade band, so they get the obtained Better roughness; The pores that are used for drilling, expanding holes, and holes on the hinge workpiece are mainly to improve the processing accuracy of the holes and improve the roughness of the surface of the workpiece. The amount of cutting tools is generally very large. The re -cuttings used to process cylindrical holes are more commonly used. The re -cutter used to process the cone hole is a cone -shaped re -cutter, which is less used. From the perspective of usage, the housing and the machine are used for the re -re -blade, and the machine can be divided into a straight handle re -blade and a taper re -cutle. The hand is used in a straight handle. Most of the hinge structure consists of the working part and the handle. The work part is mainly cutting and calibrated, and the diameter of the calibration office has inverted cone. The handle is used to be held by the clip, which is divided into a straight handle and a cone handle. There are many types according to different purposes, so there are many standards for re -cuttings. Some of our more common standards include re -re -blades, straight handle machines with rectums, rectors of cone handle machines, and straight handle. Centellar re -re -blade and so on. There are two types of knife). The pupils of the re -cutter have straight grooves and spiral grooves. The hinge precision is D4, H7, H8, H9 and other precision levels. It is divided into three types: cylindrical, cone -shaped and doorway -shaped according to the shape of the reed holes; The installation method is divided into two types: handle and suit type; Divide straight grooves and spiral grooves according to the shape of the altitude Portum customization: In customized non -standard tools, the re -cutter is a more common custom -made tool. According to different products, deep, diameter, accuracy, roughness requirements, and workpiece materials are made Life, accuracy, roughness, and stability.

The shovel is a flat -shaped car knife that is equal to the zero front angle. While the main axis of the milling cuttings, the main axis of the lathe is rotated, and the shovel is advanced to the milling axis under the cams with the Archimede thread. It can be seen that the movement trajectory of any relative milling cutter on the cutting blade is the Akimid snail line, that is, the tooth curve of the shaped milling cutter from the shovel shovel is the Archimede snail line. Because the shovel knife is shovel along the radius of the milling cutter, it is called a radial shovel tooth. When the milling cutter turns the Δ0 corner, the cam is turned around the Δθ angle, and the shovel shovel out of the back of a blade tooth. Then, when the milling cutter turned the Δ1 corner, the cam was turned around the φ1 angle, and the shovel was quickly reset and then the return motion. In short, when a milling cutter turns a corner of the tooth, the shovel is completed. Each time this process is repeated, the shovel is cut off a tooth of the milling cutter, and the shovel is restored in situ.

The main functions of sculpting tools and stone carving machines Main functions: stone engraving, stone relief, stone yang carving, stone yin carving, stone line carving, stone cutting, stone hollow. 1. Classification of stone carving machine carving tools: A series (ordinary knife alloy knife): uses high -performance alloy materials, double -edged design, good sharpness, high cost performance, and easy to grind by hand. Disadvantages: Because the angle is not standard (there is another larger angle at the tip of the knife), it is not suitable for relief. Generally used for sculpting bluestone, marble! B series (standard angle alloy knife): uses high -performance alloy materials, double -edged design, angle standards, engraving, fine relief effects. Generally used for sculpting bluestone, marble! Can be made into a flat -bottomed knife with a flat bottom The C series (Metro Molf Diamond Mill Earlier): Metro Molf Diamond Stone Sword, Military High -tech "Moisturizing Diamond Stone Technology" manufacturing! It has the characteristics of good sharpness, high sculpture efficiency, no deformation of the carved knife head, high sculpture accuracy! Therefore, when carving marble, bluestone, sandstone and other materials, it is often used as the first choice for high -efficiency relief, which is also a weapon for engraving. D series (overall alloy triangular knife): The overall alloy triangular knife uses ultra -particle ultra -wear -resistant alloy. The abrasion resistance is much higher than other triangular knives on the market. Angle standard, good lettering effect! Customers with a universal grinding machine can use this knife. If there is no universal grinding machine, it is not recommended to use it! E series (PCD polycrystalline diamond knife): Adopt imported polycrystalline diamond blade, the quality is far from cheap domestic blade comparable! Using vacuum welding technology, blade does not damage or fall off; micro -grinding technology makes the blade sharpness and optimization of strength. It is generally used to engraved the small words of granite. Good hardness, high life, good engraving effect. When using, you should pay attention to the flexible knife, do not go too hard! F series (sintering diamond grinding head knife): sintering diamond grinding head is generally used for granite milling bottom. Because the knife is made of multi -layer diamond sintering, it has a very high life span! The disadvantage is that the sharpness is not high, and the knife head will deform. Therefore, sculpture marble, bluestone and other materials, in order to obtain higher output and carving effects, it is not recommended to use a sintering knife. When making granite and other difficult processing stones, in order to avoid too high knives, sintering grinders can be selected! G series (diamond four -edge knife): Generally engraved with granite small characters or line carving. The advantage is that the life span is high, the disadvantage is that the sharpness is relatively poor, and the carving depth is shallow!

In the process of deep hole machining, problems such as the dimensional accuracy, surface quality and tool life of the workpiece often occur. How to reduce or even avoid these problems is an urgent problem to be solved at present. The following are 6 common problems and solutions for deep hole machining of tools, I hope to help everyone! 1‍, the aperture increases, the error is large‍‍‍‍ (1) Causes The design value of the outer diameter of the reamer is too large or the reamer cutting edge has burrs; Cutting speed is too high; Improper feed rate or excessive machining allowance; The main declination angle of the reamer is too large; reamer bent; Chip edge adhered to the reamer cutting edge; When sharpening, the swing of the reaming cutting edge is out of tolerance; Inappropriate selection of cutting fluid; When installing the reamer, the oil on the surface of the taper shank is not wiped clean or the taper surface is bumped; After the flat tail of the taper shank is offset into the machine tool spindle, the taper shank taper interferes; The main shaft is bent or the main shaft bearing is too loose or damaged; Reamer floating is not flexible; When the axis is different from the workpiece and the force of both hands is uneven when reaming by hand, the reamer shakes from side to side. (2) Solutions Appropriately reduce the outer diameter of the reamer according to the specific situation; reduce cutting speed; Properly adjust the feed or reduce the machining allowance; Appropriately reduce the main declination angle; Straighten or scrap bent unusable reamers; Carefully trimmed with whetstone to pass; The control swing is within the allowable range; Choose cutting fluid with better cooling performance; Before installing the reamer, the reamer taper shank and the inside of the taper hole of the machine tool must be wiped clean, and the taper surface with bumps must be polished with whetstone; Grinding reamer flat tail; Adjust or replace the spindle bearing; Readjust the floating chuck and adjust the coaxiality; Pay attention to correct operation. 2. Aperture reduction (1) Causes The design value of the outer diameter of the reamer is too small; Cutting speed is too low; The feed rate is too large; The main declination angle of the reamer is too small; Inappropriate selection of cutting fluid; When sharpening, the worn part of the reamer is not worn off, and the elastic recovery reduces the aperture; When reaming steel parts, if the allowance is too large or the reamer is not sharp, it is easy to produce elastic recovery, which reduces the aperture and the inner hole is not round, and the aperture is unqualified. (2) Solutions Replace the outer diameter of the reamer; Appropriately increase the cutting speed; Appropriately reduce the feed; Properly increase the main declination angle; Choose oily cutting fluid with good lubricating performance; Replace the reamer regularly, and sharpen the cutting part of the reamer correctly; When designing the size of the reamer, the above factors should be considered, or the value should be selected according to the actual situation; For experimental cutting, take an appropriate allowance and sharpen the reamer. 3. The reamed inner hole is not round (1) Causes The reamer is too long, the rigidity is insufficient, and vibration occurs during reaming; The main declination angle of the reamer is too small; The reaming cutting edge is narrow; The reaming allowance is biased; There are gaps and cross holes on the surface of the inner hole; There are blisters and pores on the surface of the hole; The spindle bearing is loose, there is no guide sleeve, or the clearance between the reamer and the guide sleeve is too large, and the workpiece is deformed after being removed due to the thin-walled workpiece being clamped too tightly. (2) Solutions The reamer with insufficient rigidity can use the reamer with unequal pitch, and the installation of the reamer should adopt rigid connection to increase the main declination angle; Select qualified reamer to control hole position tolerance in pre-machining process; Adopt reamer with unequal pitch, adopt longer and more precise guide sleeve; Select qualified blanks; When using an equal-pitch reamer to ream more precise holes, the spindle clearance of the machine tool should be adjusted, and the matching clearance of the guide sleeve should be higher or an appropriate clamping method should be used to reduce the clamping force. 4. The inner surface of the hole has obvious facets (1) Causes The reaming allowance is too large; The rear angle of the cutting part of the reamer is too large; The reaming cutting edge is too wide; The surface of the workpiece has pores, sand holes and the spindle swing is too large. (2) Solutions Reduce the reaming allowance; Reduce the clearance angle of the cutting part; Grinding edge width; Select qualified blanks; Adjust the machine tool spindle. 5. The service life of the reamer is low (1) Causes Inappropriate reamer material; The reamer burns when sharpening; The selection of cutting fluid is inappropriate, the cutting fluid fails to flow smoothly, and the surface roughness value of cutting and reaming is too high. (2) Solutions Select the reamer material according to the processing material, and can use a carbide reamer or a coated reamer; Strictly control the amount of sharpening and cutting to avoid burns; Always choose the cutting fluid correctly according to the processing material; The chips in the chip flute are often removed, and the cutting fluid with sufficient pressure is used for fine grinding or grinding to meet the requirements. 6. The center line of the hole after reaming is not straight (1) Causes The drilling deflection before reaming, especially when the hole diameter is small, cannot correct the original curvature due to the poor rigidity of the reamer; The main declination angle of the reamer is too large; Poor guidance makes the reamer easy to deviate from the direction during reaming; The reverse taper of the cutting part is too large; The reamer is displaced at the gap in the middle of the interrupted hole; When reaming by hand, too much force in one direction forces the reamer to deflect to one end and destroys the verticality of the reamed hole. (2) Solutions Increase the hole reaming or boring process to correct the hole; Decrease the main declination angle; Adjust the appropriate reamer; Replace the reamer with a guide part or an extended cutting part;