1.1 Ensure the quality of the speed material
The material to make gears is the basis for ensuring the quality of the parts, it is therefore particularly important to control the quality of the gear equipment. Materials to make gears in our factory are generally alloy steels such as 20CRMNTI, 19CRNI5 and 20MNCR5. In addition to the inspection and acceptance of these forge parts treatment of the machine and deformation of thermal treatment, improve the parts to increase the quality of the machining of the parts. For example, our factory made a rough vehicle with large speed parts when manufacturing the liquid gearbox of the maintenance equipment for the YH350 railways, and it was a good processing effect in the future .
1.2 Control Gear Heat before error treatment
The heat of the gear is divided into two parts, one is the treatment of the explosion of the tooth and the other part is the treatment of the tooth.
1.2.1 Machining precision
During the treatment of the explosion of the teeth, the size and precision of the internal hole in the positioning of the gear parts are the most critical. Depending on the precision level of the equipment of our factory, the size tolerance of the interior holes in the equipment is generally 0.03. , which responds to the cost, in the production economy. The straight line of the inner hole should be checked at less than 0.01.
Check the front beat and the radial beat of the dental billet: the beat of the final face of the teeth directly affects the tolerance project when the teeth are rolled. The interior holes and the end faces must be treated at the same time to ensure the beat of the end ≤ 0.01. Time control less than 0.03.
1.2.2 Precision of dental treatment
In the dental treatment process, the main factors affecting tooth errors are: the accuracy of the equipment machine of the material;
床 Precision of the Jear’s treatment machine.
The accuracy of the machines for the processing of machines largely determines the accuracy of the machined equipment, so that the maintenance of machine tools must be carried out in accordance with the regulations.
Before preparing the dental part of the parts, the difference values for each part of the machine tools meet the requirements: for example, the radial difference in the main axis of the tool-tool <0.01, the axis From the jump knife <0.005, the jump, the jump, the jump, the jump to the axis of the knife <0.005, the tree of the knife moves <0.008, the knife is installed and the jump of diameter and The end of the jumps are <0.005, the top and top of the top and the top of the upper axis <0.008, and the positioning of the backrest back after the part of the part and the jump of diameter and the final jump <0 , 01.
刀 Machine treatment tool.
When the gear knife has entered the factory, the tool parameters must be accepted according to the design requirements. The tool level is generally used in a level.
(3) Positioning provision of the dental billet.
The space between the outside diameter and the interior pores of the clip should be as small as possible, generally less than 0.02. The threads on the nucleus shaft must ensure that verticality is less than 0.01, and the interior thread and the final surface of the shoulder nut must be less than 0.01.
1.3 Folding angle of the top of the tooth and the end of the tooth
After treatment of the tooth, it must face the dental end of the tooth and the rear corner of the dental end. The advantage of the eloquence of the tooth can also be treated with an inverted edge roll with an inverted edge during the tooth shape.
1.4 Check the quality of heat treatment
The accuracy of heat treatment on gears has a large impact. In order to ensure subsequent treatment, for the parts of the ordinary structure, the degree of ellipse of the inner hole after the heat of the parts is not greater than 0.03, and the size of the line of the line of law public is not greater than 0.03 in addition to the above provisions, the warming of the final surface of the part must not be greater than 0.05;
1.5 Relax heat after heat
Once the parts are treated with heat, there is a slight deformation as a whole and the quality of the surface is reduced.
When grinding interior holes after the equipment is hot, the inner hole and the end side should not be greater than 0.015. The division is concentric. The inner hole hole and the end fabric must be carried out at the same time to ensure the verticality of the end hole. During grinding as the other side of the positioning surface, the parallelism between the two ends must be guaranteed below 0.015. Parts of the treatment of the crushing machine for the round internship must be processed after treatment.
1.6 Dental essence machining
The dental treatment of our factory is generally used by a crushing treatment of the CNC tooth tooth.
For the grinding machine of the molding teeth, the top and back of the tool machine must be checked before and after the component of the clip parts, and the coaxiality between the two upper tips must be maintained as much as possible in position central. The situation, if there is more grinding and less grinding on the side, should adjust the grinding position in time to make sure that the grinding of the room is uniform and not prepared; Wheels particles; will replace the use of the mortar to avoid the insufficient phenomenon of equipment.
For the Green wheels grinding machine, because its grinding method is different from the grinding method of the tooth grinding machine, in addition to paying attention to the above requirements, it should also pay attention to aspects Following: the grinding of the sandwheel to verse belongs to the development method, and at the same time, there are several teeth to participate in grinding, so that the grinding calories have generated more, which can easily cause burns and cracks on the surface of the teeth. Flows and multiple volunteers. . , the tool for repairing the sandwiche is not the diamond pen is a square block.
For the grinding worker axis of the tooth tooth, the cord tree positions the outer circle and the interior pores of the parts are generally less than 0.015, the central axis is less than 0.01, the surface of the tree central is smooth without traces; objects; The nucleus axis wire must be crushed by the threaded bed to ensure that verticality is less than 0.01, and the wire is tightened and that the wire is loose.
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