Powder metallurgy die easy to demold
A powder metallurgy and mold release technology, applied in the field of powder metallurgy molds, to reduce friction and wear and increase service life
Pending Publication Date: 2021-07-09
BOSUN TOOLS CO LTD
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the existing technology, provide a safe and reliable demolding method, solve the problem of cracking of the friction block green body, and improve the cold press forming of the powder metallurgy brake pad friction block green body. Rate
Method used
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Embodiment Construction
[0029] Attached below Figure 1-6 , the specific embodiment of the present invention will be described.
[0030] A powder metallurgy mold that is easy to demould in the present invention comprises a female mold 1, a jacket 2, an upper punch 3, a lower punch 4, and a cylindrical pin 5; the female mold 1 is divided into a split structure along a dividing line 12, and The outer surface 11 of the female mold has a conical structure with a certain taper, and the inner surface 21 of the jacket has a conical structure with a certain taper. The outer jacket 2 and the female mold 1 are fitted on the outer surface 11 of the female mold. The lower punch 4 is provided with a number of circular through holes 41, the cylindrical pin 5 passes through the circular through hole 41 in the lower punch 4, and exposes the upper part 51 of the cylindrical pin; the lower punch 4 and the upper punch 3 pass through into the inner hole of the female mold 1.
[0031] Preferably, the cylindrical pin 5 ...
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The invention belongs to the field of powder metallurgy brake pad friction block cold press forming, and particularly relates to a powder metallurgy die easy to demold. The powder metallurgy die comprises a female die, an outer sleeve, an upper punch, a lower punch and a cylindrical pin; the female die is divided into a split structure along a dividing line, the outer side face of the female die is of a conical structure with a certain taper, the inner side face of the outer sleeve is of a conical structure with a certain taper, the outer sleeve and the female die are matched to be arranged on the outer side face of the female die in a sleeved mode, a plurality of round through holes are formed in the lower punch, the cylindrical pin penetrates through the round through holes in the lower punch, and the upper part of the cylindrical pin is exposed; and the lower punch and the upper punch penetrate into an inner hole of the female die. The powder metallurgy die solves the problem that the joint of the steel backing and a friction body cracks when the friction block steel backing and the friction body are subjected to one-time cold press molding; and friction abrasion of the inner wall of the female die of the steel die is reduced, and the service life of the steel die is prolonged.
Description
technical field [0001] The invention relates to a powder metallurgy mold which is easy to demould, and belongs to the field of cold press forming of friction blocks of powder metallurgy brake pads. Background technique [0002] The friction block production process of powder metallurgy brake pads is that the powder metallurgy friction material and the steel back are cold-pressed in a steel mold to obtain a friction block green body, and then sintered in a sintering furnace to obtain a friction block. The feature of this production process is that the friction material and the steel back are formed by cold pressing at one time, which reduces the process of placing the steel back before sintering in the traditional production process and improves the production efficiency. However, in this production process, when the friction body is cold-pressed and demoulded, due to the different materials of the friction body and the steel back, the friction force between the inner wall of...
Claims
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Login to View More IPC IPC(8): B22F3/03B22F7/08
CPCB22F3/03B22F7/08
Inventor 张瑞涛刘英凯王炳杰赵鹏鹏陈磊刘建刚成照楠
Owner BOSUN TOOLS CO LTD