Skip to main content

How are the reasons for the deformation of CNC machined parts?


In the process of CNC machining, the deformation of the workpiece is very common. If the precision is not enough, it can be used for secondary processing. However, the deformation of the workpiece has to be rebuilt. The deformation of the workpiece is a difficult problem. The best solution is to eliminate the deformation of the CNC machining parts from the root. Let's take a look at how the deformation of CNC machined parts is caused.

cnc machining

 1. The influence of the material and structure of the workpiece on the deformation of the workpiece
The amount of deformation and the complexity of the shape, the long width and the wall thickness are proportional to the rigidity and stability of the material. It is generally necessary to reduce the influence of these factors on the deformation of the workpiece when designing the part. Especially in some large parts and structures, it is necessary to make the structure reasonable. In the process of machining, it is necessary to control the hardness and looseness of the blank to ensure the quality of the blank and reduce the deformation of the workpiece.

cnc turning
2. Deformation caused by workpiece clamping
When clamping the workpiece, you need to select the correct clamping point and select the appropriate clamping force at that position. Therefore, it is necessary to keep the clamping point and the supporting point in line, so that the clamping force acts on the support, the clamping point should be as close as possible to the working surface, and the position where the force is not easily caused by the clamping deformation is selected.

When there is a clamping force acting in several directions on the workpiece, the order of the clamping force is required. For the workpiece to be in contact with the support, the clamping force should be applied first, not too large, and the main clamping force for balancing the cutting force, Should be at the end.
Secondly, it is necessary to increase the contact area between the workpiece and the jig and the axial clamping force used. Allowing the rigidity of the part to be enhanced is very effective in solving the clamping deformation. However, due to the shape and structure of thin-walled parts, it will result in lower rigidity. In this way, deformation occurs due to the application of the clamping force.

cnc machining parts
3. Deformation caused by workpiece processing
During the cutting process, due to the cutting force, the workpiece will have an elastic deformation toward the direction of the force, which is the knife phenomenon. For similar deformations, corresponding measures can be taken on the tool. When finishing, the tool is required to be sharp, so that on the one hand, the resistance formed by the friction between the tool and the workpiece can be reduced. On the other hand, the heat dissipation can be improved when the tool is cut. Ability to reduce residual internal stress on the workpiece.

The heat generated by the friction between the tool and the workpiece during machining also deforms the workpiece, and high-speed machining is generally selected. In this type of processing, since the cutting chips are removed in a short time, most of the cutting heat is carried away by the chips, which can effectively reduce the deformation.
cnc machining

In order to ensure the accuracy of the parts, a reasonable amount of cutting is required during the machining process. In the case of thin-walled parts with high processing precision, symmetric machining is generally adopted to equalize the stress generated on the opposite sides to reach a stable state, and the workpiece is flat after processing.

cnc milling
The above is a summary of the causes of the deformation of CNC machined parts. They are some of the more critical points. To ensure the quality of CNC machined parts, it is necessary to pay attention to these points in order to process CNC machined parts.

Labels

Labels:

Comments

Post a Comment

Popular posts from this blog

Machining and welding process notes for TC4 titanium alloy parts

Common welding methods for titanium and titanium alloys are as follows: Argon arc welding, submerged arc welding, vacuum electron beam welding, etc. Tungsten argon arc welding is used for thicknesses of 3 mm or less, and argon arc welding is done for 3 mm or more. The purity of argon is over 99.99%, and the content of air and water vapor in argon is strictly controlled. Currently, for TC4 titanium alloys, argon arc welding, plasma arc welding are often used for welding, but both methods need to be filled with welding material. Limitations on shield gas, purity and effectiveness increase the oxygen content of the joint, reduce its strength and increase its post-weld deformation. Electron beam welding and laser beam welding are used. The following is a description of precision welding and precautions for TC4 titanium alloy. 1. Weld hole problem Table of Contents 1. Weld hole problem 2, internal quality of welded part 3. Weld depth and its variation 4, j...
Post a Comment
Read more

Introduction to the correct choice of lubricating oil in summer

In the summer heat, not only the human body will have various adverse reactions, but also the car. Today, I will share with you one of the things you need to pay attention to in summer-lubricants. The role of lubricating oil The heat generated by the friction between the various moving bearing surfaces of the engine is second only to the heat when the engine cylinder is burned, and the lubricating oil takes the heat away by pressure lubrication, thus ensuring the normal operation of the friction surface. The heated lubricating oil returns to the oil pan through the oil passage for cooling. In terms of the structure of the engine, the oil pan is located under the engine*, and it is exposed to the air. It is generally made of materials with good thermal conductivity, and the lubricating oil is air-cooled through it. The cooled lubricating oil is sent to the lubricated surface again. The viscosity of the lubricating oil is very important for protecting the en...
Post a Comment
Read more
The production process of KOVAR parts processing has a great relationship with the process, including the process environment elements and the optimization configuration elements of the process route. The process route process needs to be formulated by an experienced person. The following is a brief explanation of the process process. The formulation of the process route process: First, the geometric structure of the parts, the core parts of the accuracy index, the accuracy requirements, material characteristics, heat treatment requirements and performance requirements, etc. should be carefully analyzed, and then the blanks of the parts should be reasonably selected, the cnc machining china equipment should be used reasonably, and reasonable measures should be taken. Many process links such as stress process measures are reasonably configured. In the production organization process, the process is strictly implemented. During the process, strict inspection is performed. For general p...
Post a Comment
Read more