4results about How to "Uniform wall thickness distribution" patented technology

The invention belongs to the technical field of metal thin-wall pipe fitting annular section shape and wall thickness control, and provides a large-size thin-wall pipe fitting hot air pressure forming pipe fitting section shape and wall thickness control device and method. The device comprises a pipe blank annular section control device and a final forming die for controlling annular flowing of materials to achieve local stamping. The pipe blank annular section control device controls the section shape, and the final forming die is used for controlling the wall thickness and achieving local rapid cooling in the hot air pressure forming process. Through the synergistic effect of the inner pressing ball and the outer pressing ball, the cross section of the pipe blank generates local convex and local concave characteristics at the same time, and the stability of the pipe blank in the machining process is improved only by changing clamping grooves of the upper pressing ring and the lower pressing ring for the pipe blank with the specific shape and diameter. And a cooling water channel of the final forming die is specially designed, so that the specific position of the pipe blank is locally and rapidly cooled during hot air pressure forming, and the phenomenon of local thinning and cracking of the pipe blank is effectively prevented.

The invention discloses a partition groove type oil distribution crankcase for a refrigeration compressor, and aims to provide a partition groove type oil distribution crankcase which can effectively solve the problem that the cylindricity precision of a friction working surface of a piston is influenced due to the arrangement of a U-shaped groove and can better control the cylindricity precision of a piston working hole matched with the piston; the partition groove type oil distribution crankcase for the refrigeration compressor can effectively solve the problem that the refrigeration efficiency of a refrigerator is reduced due to the fact that oil enters a friction working face of a piston from a U-shaped groove and then enters a refrigeration system of the refrigerator to participate in external circulation under the condition that assembly of an air cylinder assembly is not affected. The cylinder head is provided with a cylinder hole and a mounting groove, and the mounting groove is located above the cylinder hole and communicated with the cylinder hole. The oil cylinder further comprises a pipe sleeve, the pipe sleeve is embedded in the air cylinder hole, an inner hole of the pipe sleeve forms a piston working hole matched with the piston, the pipe sleeve blocks the installation groove, and therefore oil entering the piston working hole from the installation groove is blocked.

An independent air suspension supporting arm relates to the technical field of vehicle accessories and comprises an air bag supporting arm and a shock absorber supporting arm, the air bag supporting arm and the shock absorber supporting arm are integrally formed, an air bag mounting hole is formed in the connecting position of the air bag supporting arm and the shock absorber supporting arm, and the end of the air bag supporting arm is arranged to be a mounting end. The bottom of the air bag supporting arm is sequentially provided with a plurality of special-shaped structure grooves from the mounting end to the shock absorber supporting arm in the extending direction of the air bag supporting arm. And a shock absorber mounting hole is formed in the end part of the shock absorber supporting arm. The air bag supporting arm and the shock absorber supporting arm are integrated, the forming efficiency can be improved, the production cost can be reduced, the connecting strength and rigidity can be improved, and the product quality and the use safety can be improved.

The application discloses a kind of low plasticity metal pipe blank viscous medium circumferential progressive expansion joining method and device, belong to pipe plate expansion joining technical field.Utilize plunger movement extrusion viscous medium, and through the rotation of mandrel, the pressure that plunger provides viscous medium is circumferentially progressively applied to pipe blank, let pipe blank locally occur deformation, embed the recess that is opened inside pipe plate hole, after mandrel rotates multiple times, pipe blank gradually with pipe plate recess is fitted, form firm mechanical lock, complete expansion joining process.The application solves the current low plasticity metal pipe blank expansion joining deformation difficult, expansion joining after pull-off force small and so on, can effectively improve the connection quality of low plasticity metal pipe blank-pipe plate.Using viscous medium circumferential progressive expansion joining method, wall thickness distribution is uniform during plastic deformation of pipe blank, stress state is reasonable, increase the service life of connected joint.