CNC machining of small holes in stainless steel materials
Compared with ordinary materials, the processing technology of stainless steel materials is more complex. How to process the small holes of stainless steel parts? Here are some skills on how to process the small holes of stainless steel parts?
In the field of machining, first of all, the design of process route and the selection of machining tools: according to the actual situation of small holes of stainless steel parts to be machined, the following process route can be formulated: rough inner shape – semi fine inner shape – fine inner shape – fine inner hole annular groove – end groove. The selection of cutting tools should be based on the characteristics of stainless steel and comprehensive consideration from all aspects. It includes the following points:
- In order to avoid the phenomenon of workpiece falling off, it is necessary to select the right-hand tool opposite to the thread of the thread mould.
- Try to choose the shape of the tool and the shape of the cutting groove (not smooth) with the smallest cutting force, so as to reduce the impact on the rigidity of the part.
- The arc of the tip should be moderate. If the arc is too large, it will produce chattering lines; If the arc is too small, the tool tip is easy to be damaged, which affects the service life of the tool.
- In the selection of cutter bar, the form of internal cooling should be selected, so that the parts will be fully cooled in the processing process, and the chip removal direction should be controlled accordingly.
Small hole machining control of stainless steel parts: due to the structure of mechanical parts, the positioning mode of thread mould can only be used for clamping during inner cavity turning. For the special requirements of workpiece machining, if the center of gravity is irregular, it will be easy to be unbalanced in the clamping system. At the same time, there are high requirements for dimensional accuracy, coaxiality and verticality. If there is a little error in the processing process, it may have a serious impact on the practical performance of the parts.
Therefore, for the machining of small holes in stainless steel parts, there should be strict requirements for the selection of tools, cutting parameters and the setting of process route. These factors will affect whether the part is qualified after machining. The machining accuracy of machining equipment itself is also very important!
The above is how to process stainless steel holes of precision machined parts. Thank you for your attention!
ken. tang@chengcg.com
How to prevent aluminum alloy processing deformation
In the field of mechanical parts processing industry, aluminum alloy parts processing is the most common metal material. In the processing of aluminum alloy parts, such parts are generally processed by aluminum alloy plate as a whole. Such parts have large metal removal and low rigidity. In the processing process, the material deformation will be caused by residual stress, clamping force and cutting movement.
Residual stress: during the formation of metal processing materials, the arrangement of metal crystals is not neat in the ideal state. The size and shape of crystals are different. There is original residual stress, which is slowly released over time and produces certain deformation. In addition, in the process of machining precision mechanical parts, the plastic deformation of metal cutting and the friction heat between the tool and the workpiece make the temperature difference between the machined surface and inner layer larger, produce greater thermal stress and form thermal stress plastic deformation.
The deformation produced in the cutting process of aluminum alloy materials is not caused by a single reason, but often the structure of the combined action of several reasons, and this combined action is not invariable in the machining process. With the continuous change of machining, it is difficult to judge which reason has the greatest impact on the deformation. We can only start from the cause of deformation, Adopt corresponding process methods to minimize machining deformation.
Clamping force: as the wall of aluminum alloy thin-walled cavity mechanical parts is relatively thin, whether clamping with Bench Vise or chuck will produce transverse or radial clamping force, which will inevitably produce clamping deformation. The degree of clamping deformation is related to the clamping force. If the clamping force is large, it will form unrecoverable plastic deformation.
If it is small, elastic deformation will be formed. The elastic deformation will recover after the part is unloaded, but the cutting is carried out when the elastic deformation does not recover. The recovery of single elastic deformation will bring new deformation to the processed part.
Cutting motion: the cutting process is the process of interaction between the tool and the workpiece, which enables the tool to remove part of the material from the workpiece. Cutting motion causes the phenomena of extrusion, tension and fracture between the crystal particles of the material. These phenomena will cause the displacement between the atoms of the crystal and form unrecoverable plastic deformation.
The above is how to control the deformation of aluminum alloy processing in mechanical parts processing. Thank you for sharing!
ken. tang@chengcg.com
Function of rotary center of CNC machining parts
In the machining industry, ordinary machining equipment includes lathes, milling machines, grinders, wire cutting processing, etc., and precision machining equipment includes precision grinder processing, CNC lathe processing, CNC processing, slow wire walking processing, etc; Select reasonable processing technology and different processing equipment according to the accuracy requirements on the production drawings. General processing equipment will have auxiliary accessories, and auxiliary accessories also have different functions in. Let’s take a look at the application of rotary center of processing equipment accessories
In the process of machining mechanical parts, when complex or high-precision workpiece processing is encountered, auxiliary accessories are sometimes required to complete the processing. Such as lathe machining shaft parts, with the help of central hole positioning, the application of rotary center is very large. Because of the high precision of mechanical parts, it is a necessary machine tool accessory for high-speed cutting on small precision lathe.
The above is the application of the rotary top of processing equipment. Thank you for sharing!
ken. tang@chengcg.com
Surface oxidation treatment process of aluminum parts
During the processing of aluminum parts, some choose anodizing surface treatment process. Let’s see what kinds of process options are generally available for anodizing surface treatment:
- Aluminum materials can be divided into 5052, 5055, 6061, 6063, 7075 and other different materials. Surface sandblasting + oxidation: sandblasting includes 80#, 100#, 120#, 180# and so on. The higher the value, the finer the sandblasting, but at the same time, the worse the masking effect on surface machining defects. Oxidation after sandblasting will cover scratches, bumps and knife marks during machining;
- Simple oxidation: oxidation can be divided into natural color oxidation, colored oxidation, or multi-color oxidation according to customer requirements, such as black, red, yellow, green, etc. simple oxidation has high requirements for machining quality. If there are knife marks and scratches after machining, they will be exposed after oxidation;
- The film thickness, treatment time and process of aluminum oxidation can also be divided into bright oxidation, semi bright oxidation and matte oxidation (frosted surface). It is particularly emphasized here that matte oxidation has high requirements for material density and composition of aluminum. If there are material density, purity, composition defects and defects, serious surface quality defects will appear after oxidation, such as pores, black spots Oxidation spots, etc. Therefore, under the background of the current domestic aluminum quality situation, customers are not recommended to choose matte oxidation. If similar surface effects are required, the oxidation effect of spraying fine sand + semi bright is relatively close;
- There are also electrochemical reaction and chemical reaction. Oxidation can also be divided into anodic oxidation and conductive oxidation. Anodic oxidation is an electrochemical reaction, which generally takes a long time. The product surface has a film thickness of 10-15 microns, which is ideal in terms of wear resistance and hardness, but it is not conductive. Conductive oxidation is a pure chemical reaction, A very thin film is coated on the surface of the workpiece to only prevent atmospheric oxidation and corrosion. Because the film is very thin, it does not affect the conductivity of the workpiece;
The above is about the surface oxidation treatment process of aluminum parts processed by CNC. Thank you for your attention!
ken. tang@chengcg.com
Damage of cast iron to CNC machine tools
In the field of machining, we can encounter the processing of various metal materials, plastic materials, special materials and other spare parts. Generally, the materials with low density are easy to cut, and the requirements for tool selection are not high, nor does it hurt the machine tool (such as aluminum). There are also some materials that hurt the machine tool in the processing process, such as common cast iron materials. Let’s see why cast iron materials hurt the machine tool
Cast iron materials are believed to be familiar, because most machining equipment is made of cast iron. Cast iron materials have good wear resistance and high material density. Cast iron is made by die casting. It is strong. It has certain requirements for the knife in the processing process, and it is quite damaged to the machine tool. Cast iron is cast by die casting, and the cut materials are all gray powder, which will damage the machine tool accessories, bearings and screw rods, and damage the accuracy of the machine tool. If it is not a professional manufacturer engaged in cast iron processing, many mechanical parts processing manufacturers are unwilling to contact cast iron processing. If they process, they also need to use machine tools with poor accuracy, for fear of damaging the accuracy of the machine tools.
Does the cast iron material damage the machine tool in the machining industry? There is indeed damage to the machine tool. When we encounter the processing of cast iron materials, we can use machine tools with poor accuracy. In this way, it can be used reasonably without damaging the accuracy of the machine tool with good accuracy.
ken. tang@chengcg.com
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