What is the gear machining accuracy and how to improve it?

One: Gear machining accuracy:

Gear accuracy refers to a grade of the comprehensive error of the gear shape, including some important parameters such as tooth profile, tooth direction, and radial runout.

The tooth profile refers to the radial shape of the tooth, the tooth direction refers to the longitudinal shape of the tooth, and the radial jump refers to the error of the distance between two adjacent teeth.

Gear machining accuracy is mainly to control the accuracy of gear transmission between gears during operation, such as: smoothness of transmission, fluctuation of instantaneous speed, if there is alternating reverse operation, whether the backlash of the tooth is minimized, if there is an impact The accuracy of the load should be slightly improved to reduce the damage to the gear caused by the impact load.

The gear machining accuracy has 13 accuracy grades, arranged in the order of numbers 0-12 from low to high, with 0 grade being the highest and 12 being the lowest.Gear processingEach processing link (heat treatment, gear grinding, etc.) will have an impact on its accuracy, which requires a complete quality management implementation.

XNUMX. Several major factors affecting gear machining accuracy:

In the process of gear processing, factors such as the manufacturing error of the tooth blank, the manufacturing of the tool, the grinding and installation error of the tool, the installation error of the machined parts, and the accuracy error of the machine tool will affect the processing accuracy of the gear and cause the processing error of the gear.

According to the standard error of GB/T1009.5, it can be divided into: cumulative error of circumferential section, error of base section, error of tooth profile, radial runout of ring gear, error of tooth direction, etc.

The choice of gear accuracy grade should be determined according to the purpose of the transmission, use conditions, transmission power, peripheral speed, performance indicators or other technical requirements.

XNUMX. Several methods to improve gear machining accuracy:

1. Improve gear processing technology:

Processing skills can have a greater impact on errors, so only by actively improving skills can the accuracy of gears be improved.

a. Make sure that the axis of the worktable and the central axis of the fixture can be completely overlapped.

b. Do sufficient inspection work before installing the tool, and then try to clean the end face and inner hole of the tool, and slowly push the blade into the handle. It should be emphasized that no heavy objects can be used to hammer the handle.

2. Improve the accuracy of the machine tool itself:

The problems of the machine tool itself are the factors that cause most of the reduction and unqualified gear machining accuracy. This is the first thing that everyone should pay attention to.

a. Pay attention to the various details of machine tool parts, carefully and scientifically adjust the cutting amount, materials and other details, especially the reasonable selection of tools, geometric parameters, cooling and lubrication, etc., find ways to improve the rigidity of the tools, and maintain the equipment in time Wait.

b. The machine tool must pay attention to the maintenance and maintenance of the machine tool in the process of processing gears. If there is a problem with the machine tool, it must be solved as soon as possible to prevent affecting the accuracy of gear processing.

3. Reduce the error of gear and tooling clamping, improve the processing technique, and improve the accuracy of the center axis of the fixture, the center of the mold, etc.:

4. Strictly limit the verticality of the nut axis to the end face.

The above is the description of gear machining accuracy shared with you today, including but not limited to, if you have any deficiencies, please add it. If you have more questions or related needs, you can click on the consultation window on the right side of EP for free consultation.