How to maintain quality and precautions during large-scale machining

How to maintain quality during large-scale machining
1. In the process of large-scale mechanical processing, it controls the quality of raw materials. Generally, high-quality raw materials are the prerequisite for the production of high-quality products. No matter what method is adopted, the raw materials must undergo strict chemistry after arriving at the factory. Composition inspection, grain size determination, purity evaluation. The purpose is to adjust the heat treatment deformation in time to improve the quality of the tooth profile processing.
2.2. Civilized production: More than 30% of gear transmission noise is caused by burrs and bumps. Some factories remove burrs and bumps before the gearbox is assembled, which is a passive approach.
3. Make organizational preparations in order to be able to deal with it. It should be noted that in the normalizing or quenching and tempering process, the furnace temperature must be maintained uniformly, and the work-position equipment must be used to uniformly heat and cool the workpieces, and it is strictly forbidden to stack them together.
4. Large-scale machining needs to control the accuracy of gears, the basic requirements of gear accuracy, through practical verification, the gear accuracy must be controlled at GB10995-887~8, the linear speed is higher than 20m/s gear, the pitch limit deviation, The radial runout tolerance and tooth direction tolerance of the ring gear must be stable and reach 7-level accuracy.
5. Prevent heat treatment deformation: After rough machining, the tooth blank becomes a fine forging, which is normalized or quenched and tempered.
Precautions for large-scale machining
Wear protective equipment for large-scale machinery processing before work. It is forbidden to wear gloves and scarves. Before starting the machine tool, you must understand the purpose or operation method of each handle, and check whether each part of the machine tool is running normally. You must use it before starting the machine tool. The wrench clamps the tool and the workpiece, and the machine tool is not allowed to start without the permission of the instructor.
Before the large-scale machining of the machine tool is started, it is not allowed to work such as speed change, chip removal or size measurement, and it is not allowed to touch the running part. If there is foreign matter or chip on the machine tool, it is not allowed to take it by hand or blow it with the mouth. If the object is loose or the equipment is abnormal, stop immediately.