When it comes to milling, it can be regarded as an important way in the field of aviation manufacturing. As we all know, it is generally expected to improve the material removal rate in the machining process. Traditional milling methods usually increase the tool meshing angle to meet the requirements of material removal rate. However, this will inevitably lead to long contact time between the tool and the workpiece, and the increase of cutting temperature, which will affect the service life of the tool.

Nowadays, there are high processing requirements for parts, but in the actual processing process, there will be many influencing factors that affect the accuracy of the plus I. The actual processed parts cannot reach the point of zero touching zero completely according to the drawing design, and there will be certain errors more or less. How to reduce these errors to the point that does not affect the use is a long-term research topic, this article will introduce how to improve the machining accuracy.

The workpiece is the basic component of modern machinery and equipment, and its plus I precision directly determines whether the quality and precision of the mechanical equipment can meet the production needs. Therefore, many workpieces are required to have sufficient machining accuracy in the machining process. The machining accuracy here mainly refers to whether the size, shape and surface of the parts in the machining process meet the relevant parameters in the design drawings,

If the ideal set parameters are obtained, then the size of the part is the average size, the shape of the part, that is, the absolute plane or circle, cylinder, cone or straight line, and the analysis from the surface of the part, the absolute vertical, parallel or symmetrical and coaxial. In the process of processing, there will be processing errors, that is, the deviation between the actual parameters and the ideal parameters of the design. And how to be able to reduce similar errors in the processing process. To make the processed workpiece meet the requirements of the design standard is what we need to study step by step at present.

Factors Affecting Machining Accuracy

There are many reasons for the influence of machining error, and the following will elaborate on the factors affecting the accuracy of machining:

(1) The principle error of processing mainly refers to the error caused by using the approximate blade contour or the approximate transmission relationship during the processing. The error of machining principle appears in thread, gear and complex surface machining.

(2) Adjustment error refers to the error caused by the adjustment of the workpiece in the processing process.

(3) The error of the machine tool refers to the machining error caused by the machine tool not being installed in place during the manufacturing process or due to the wear of the machine tool during use. The guide rail guide error of the machine tool refers to the error of the moving axis of the machine tool along the axis direction. The guide rail guide accuracy mainly affects the relative displacement of the tool along the guide rail direction and the workpiece in the error sensitive direction. Among them, the error of the machine tool rotation axis rotation axis along the direction of the central axis caused by the radial jump and other errors will be the error of the processed workpiece in the radial direction. The transmission error of the machine tool transmission chain is the machine tool movement from the motor transmission to the mobile axis. error between the transmission ratios.

Fixture error mainly refers:

(1) Positioning element. Tool guide elements. Manufacturing error of indexing mechanism, fixture body, etc;

(2) After the fixture is assembled, the relative size error between the working surfaces of the above components;

(3) The working surface of the fixture is worn during use.

(4) Process error refers to the workpiece in the processing process.

Due to the cutting force, clamping force. The deformation of the workpiece produced by the action of heavy and inertial forces, if these deformations are not taken into account in the processing process, will affect the adjusted process system.

The workpiece coordinate system, if processed according to this coordinate system, will produce a great deviation.

At the same time, different measurement methods may also bring-fixed error.

How to improve the machining accuracy

1 Adjust the process system. Adjust the amount of cutting tools by measuring the size of the tool through trial cutting. Cut again and repeat until the required size is reached. This method has low production efficiency and is mainly used for single-piece small batch production. The required size is obtained by pre-adjusting the relative positions of the machine tool, the fixture workpiece and the tool. This method has high productivity and is mainly used for mass production.

2 Reduce machine tool errors: (1) Improve the manufacturing accuracy of spindle components. The rotation accuracy of the bearing should be improved, and the accuracy of the parts with the bearing should be improved. (2) Appropriate pre-tightening of the rolling bearing: ① The clearance can be eliminated; ② The rigidity of the bearing can be increased; ③ The error of the rolling element can be averaged. (3) the spindle rotation accuracy is not reflected on the workpiece.

3 Reduce the transmission error of the transmission chain. The number of transmission parts is small, the transmission chain is short, and the transmission precision is high;

4 reduce tool wear. The tool must be resharpened before the tool size wear reaches the sharp wear stage.

5 Reduce the stress and deformation of the process system mainly from: (1) improve the stiffness of the system, especially to improve the stiffness of the weak link in the process system; (2) reduce the amount of knife, according to the material of the workpiece to choose a reasonable amount of knife.

It can be seen from some that the accuracy of each link in machining cannot be ignored, but the accuracy of the tool accounts for a large part. Therefore, it is still important to ensure the original accuracy of the tool and the wear resistance of the tool. If only the original accuracy of the tool is high, but in the process of use, the workpiece accuracy will also be affected due to frequent tool change due to tool wear.

German KHC brand milling cutter, using advanced German and Swiss grinding equipment, using European high-quality tungsten steel bars and coating technology with Swiss PLATIT, has created KHC high-precision, high-hardness metal cutting tools.