CN101024235A

CN101024235A - Precision drawing convex-shaft method of ensuring puched draw-wall not become thin

Info

Publication number: CN101024235A
Application number: CN 200610013182
Authority: CN
Inventors: 刘长伟; 高峰
Original assignee: JINZHAO ELECTROMECHANICAL DEVELOPMENT Co Ltd TIANJIN
Current assignee: JINZHAO ELECTROMECHANICAL DEVELOPMENT Co Ltd TIANJIN
Priority date: 2006-02-20
Filing date: 2006-02-20
Publication date: 2007-08-29

Abstract

The invention relates to precision stretching convex shaft method used to make pressing stretching wall thickness be not thinning. It includes the following steps: pressing against the discharging board; stretching forming from the male die to the cavity die; the forming shape follows the male die; sending the stock belt into the secondary working procedure that containing the male die in the stock belt; wrapping the stretching stock belt into the secondary stretching cavity die hole; choking out the die to keep flatness and verticality. The invention can make the pressing stretching wall thickness be not thinning. Thus it can be used in continuous stretching die with one die many service positions, especially for the precise electron device or mechanics device such as convex shaft, connecting shaft etc.

Description

The method of the precision drawing convex-shaft that ensures puched draw-wall not become thin

Technical field

The invention belongs to the punching stretch method, particularly a kind of method of the precision drawing convex-shaft that ensures puched draw-wall not become thin.

Background technology

Existing punching stretch, as being drawn into tube or protruding axle from sheet material, the general mould that adopts will be through repeatedly stretching, but each the stretching stretch especially at last several times, and the wall thickness of general workpiece all will be along with the punching stretch attenuate.The workpiece that has proposes very high technical performance indexs such as intensity to the position that will stretch, and has so just reduced wall thickness.Therefore wall thickness after not reducing to stretch or the wall thickness after reducing to stretch have less proposed try one's best in drawing process.

Existing conventional punching stretch can not sort this problem out, and general at present conventional stretching is such: the stretching position is made up of punch and die and holding pad.The process of work is: workpiece material is put between mould punch and the die, punch press begins action, before punch and die matched moulds, holding pad is pressed in workpiece material on the die earlier, punch and die begin matched moulds, and punch is pressed into die with workpiece material workpiece material is stretched, because holding pad is pressed in stretching position workpiece material around the die shrinkage pool tightly, therefore the position that stretches is the material around the shrinkage pool mostly, therefore causes the wall thickness at workpiece stretching position to be drawn thin.

Summary of the invention

Technical problem to be solved by this invention is: the method that a kind of precision drawing convex-shaft that ensures puched draw-wall not become thin is provided.This method can solve puched draw-wall not become thin or few attenuation.The stamping parts of particularly suitable precision instrument uses.

Technical scheme of the present invention is:

A kind of method of the precision drawing convex-shaft that ensures puched draw-wall not become thin, it is characterized in that: in the process that substep repeatedly stretches, conventional punching stretch method is adopted in previous shallow stretching: earlier strip is pushed down with stripper, to the in-draw moulding of die hole, forming shape is with the punch shape by punch; After the method that adopts of several times progressively drawing process be: the strip of once-forming is sent in the secondary operation, and punch press begins action.Before punch and die matched moulds, earlier punch is contained in the bowl-shape strip that one-off drawing goes out, punch and die begin matched moulds.The fillet of die entrains into the one-off drawing strip in the succeeding stretch die hole.The patrix discharging spring of this moment will have enough big strength to keep the parastate of mould, and the choke-out of last pattern tool guarantees the perpendicularity of flatness and protruding axle.Through so several times progressively drawing process, form the workpiece of final tension shape at last again.

Effect of the present invention is:

Adopt the method for this precision drawing convex-shaft that ensures puched draw-wall not become thin to solve puched draw-wall not become thin or few attenuation.It may be used in the continuously elongated mould of a mould multistation.Especially requirement of strength height on Jing Mi electronic device, the accurate mechanical devices, the concrete little stretched portion of size is as protruding axle, positions such as connecting axle.

Description of drawings

Fig. 1 is that one of continuous process is processed in example one diel of using the method for the precision drawing convex-shaft that ensures puched draw-wall not become thin: mould open mode figure

Fig. 2 is that two of continuous process is processed in example one diel of using the method for the precision drawing convex-shaft that ensures puched draw-wall not become thin: mould upper and lower mould contact condition schematic diagram

Fig. 3 is that three of continuous process is processed in example one diel of using the method for the precision drawing convex-shaft that ensures puched draw-wall not become thin: mould closure state schematic diagram

Fig. 4 is that four of continuous process is processed in example one diel of using the method for the precision drawing convex-shaft that ensures puched draw-wall not become thin: mold stroke open mode schematic diagram

Fig. 5 is that five of continuous process is processed in example one diel of using the method for the precision drawing convex-shaft that ensures puched draw-wall not become thin: the discharging view behind the mould succeeding stretch

Fig. 6 is that six of continuous process is processed in example one diel of using the method for the precision drawing convex-shaft that ensures puched draw-wall not become thin: mould open mode schematic diagram

Fig. 7 is the sectional drawing of processed workpiece strip

Among the figure: 1 upper bolster, 2 fixing backing plates, 3 fixed heads, 4 discharging backing plates, 5 unload strip, 6 concave templates, 7 die backing plates, 8 die shoes, 9 times strippers, 10 one-off drawing punch, 11 one-off drawing dies, stretching convex die after 12 secondaries, 13 secondaries are with the after-drawing die, 13.1 secondary is with after-drawing die pressure pin, 14 patrix discharging springs, 15 patrix spacer sleeves, 16 guide column, 17 correcting pre-punched hole punch, 18 correctings nail, 19 unload the strip limited post, 20 guide posts, 21 retainer posts, 22 times distance screws, 23 times guide pillars, 24 processed workpiece strips

The specific embodiment

The method of the precision drawing convex-shaft that originally ensures puched draw-wall not become thin, be in the process that substep repeatedly stretches, conventional punching stretch method is adopted in previous shallow stretching: earlier strip is pushed down with stripper, to the in-draw moulding of die hole, forming shape is with the punch shape by punch; After the method that adopts of several times progressively drawing process be: the strip of once-forming is sent in the secondary operation, and punch press begins action.Before punch and die matched moulds, earlier punch is contained in the bowl-shape strip that one-off drawing goes out, punch and die begin matched moulds.The fillet of die entrains into the one-off drawing strip in the succeeding stretch die hole.The patrix discharging spring of this moment will have enough big strength to keep the parastate of mould, and the choke-out of last pattern tool guarantees the perpendicularity (Fig. 2) of flatness and protruding axle.Through so several times progressively drawing process, form the workpiece of final tension shape at last again.

Use examples of implementation of the method, as Fig. 1--the-6th, the instantiation of the method for the precision drawing convex-shaft that application ensures puched draw-wall not become thin.This 1---6 figure is the continuous process of diel processing, and each figure is the static figure at several states of a jig frequency process of punching press:

Fig. 1 is one of an example diel processing continuous process mould open mode, the workpiece strip 24 that this moment is processed, be placed in counterdie and be connected between the following stripper 9 on the counterdie, by following distance screws 22 on the die shoe and guide post 20 processed workpiece strip 24 is located, hold processed workpiece strip 24 by retainer post 21.

Fig. 2 is the two molds upper and lower mould contact condition of example diel processing continuous process, a state in the process when the beginning upper and lower mould is near each other.

This moment is in the A district of mould: the one-off drawing punch 10 on the upper bolster 1 does not also contact strip 24.

This moment is in the B district of mould: the concave surface that the first time after the secondary on the upper bolster 1 on the first and processed workpiece strip 24 of stretching convex die 12, operation tentatively stamped out contacts, further when near each other at upper and lower mould, stretching convex die 12 will be on the processed workpiece strip 24 after the secondary first time, the edge of the concave surface that operation tentatively stamps out pushed up secondary on the die shoe 8 with in after-drawing die 13 holes, and the first time, the bottom and the secondary of the concave surface that operation tentatively stamps out held out against with the stretching die pressure pin 13.1 in after-drawing die 13 holes.

Fig. 3 is three mould closure states of example diel processing continuous process, when upper and lower mould further is close, when reaching the state of upper and lower mould closure:

This moment is in the A district of mould: the one-off drawing punch 10 on the upper bolster 1 with the one-off drawing die 11 of processed workpiece strip 24 on die shoe 8 in the shallow nest of shallow pull-shaped one-tenth.

This moment is in the B district of mould: mould flattens strip 24.

Fig. 4 is four mold stroke open modes of example diel processing continuous process, at this moment upper and lower mould begin mutually away from.

Fig. 5 is five mould discharging states of example diel processing continuous process, at this moment upper and lower mould further mutually away from.Following stripper 9 on the die shoe 8 breaks away from secondary stretching convex die 12 later on strip after the succeeding stretch in the strip 24 24.

Fig. 6 is six mould open modes of example diel processing continuous process, at this moment upper and lower mould further mutually away from.Reach the original state in the punching course one time.

Above process can be a several steps, forms the designing requirement of the key element part at this position of workpiece at last.

Fig. 7 is from left to right each procedure process that the sectional drawing of processed workpiece strip is represented, initial (Far Left) is the shallow stretching that the conventional punching press in first road forms, and what per step adopted afterwards is the punching course of this method.The final workpiece component designing requirement of (rightmost) formation to the end.

Claims

1, a kind of method of the precision drawing convex-shaft that ensures puched draw-wall not become thin, it is characterized in that: in the process that substep repeatedly stretches, conventional punching stretch method is adopted in previous shallow stretching: earlier strip is pushed down with stripper, to the in-draw moulding of die hole, forming shape is with the punch shape by punch; After the method that adopts of several times progressively drawing process be: the strip of once-forming is sent in the secondary operation, and punch press begins action; Before punch and die matched moulds, earlier punch is contained in the bowl-shape strip that one-off drawing goes out, punch and die begin matched moulds; The fillet of die entrains into the one-off drawing strip in the succeeding stretch die hole; The patrix discharging spring of this moment will have enough big strength to keep the parastate of mould, and the choke-out of last pattern tool guarantees the perpendicularity of flatness and protruding axle; Through so several times progressively drawing process, form the workpiece of final tension shape at last again.