CN101190449A

CN101190449A - Flanging shaping method for die orifice without concave die

Info

Publication number: CN101190449A
Application number: CNA2006101571477A
Authority: CN
Inventors: 王增强
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2006-11-29
Filing date: 2006-11-29
Publication date: 2008-06-04
Anticipated expiration: 2026-11-29
Also published as: CN101190449B

Abstract

The invention provides an internal flanging forming method of a no-female die opening. After the external flanging is formed, a bulge is formed on the billet before an internal flanging is formed; the radial dimension of the internal wall of the bottom port of the bulge is corresponding to the diameter of the internal hole. The method of the invention forms the bulge with a dimension corresponding to the diameter of the internal hole formed during the internal flanging forming in advance on the billet before the internal flanging is formed but after the external flanging is formed and effectively solves the flanging forming problem when the spacing between the external flanging and the internal flanging is small; furthermore, the pre-formed bulge leads the internal flanging forming to be easier and reduces the impact on the die.

Description

The flange forming method of no die die orifice

[technical field]

The present invention relates to a kind of flange forming method, especially a kind of flange forming method that does not have the die die orifice.

[background technology]

Flange is meant translates into the molding process of erectting straight flange with the bore edges of part or outer rotating edge under mould action, can make work piece have suitable shape by flange, perhaps has good stiffness (flange plays strengthening action), perhaps make work piece have rational spatial form, reduce the space hold of work piece, so in actual production, use wider.For workpiece shown in Figure 1, the process of interior flanging take usually to turn over earlier flanging 2, after turn over the processing step of in-flanges 4.The flange of flanging 2 can adopt conventional flange to rout up smoothly.If the die die orifice corresponding to the turn-up process of in-flanges 4 will be set on the mould, because flanging 2 has turned over during in-flanges 4 flange, the maximum of the thickness of die die orifice is a spacing size between flanging 2 and the in-flanges 4, and the flanging 2 and the spacing between the in-flanges 4 of workpiece shown in Figure 1 are very little.In Fig. 1, material thickness is 3.6mm, and the spacing between flanging 2 and the in-flanges 4 only is 2mm, that is the maximum of the thickness of die die orifice is 2mm.Obviously, such die die orifice undercapacity active force when bearing in-flanges 4 flange.Die orifice can't be set being applicable on the die of this type of workpiece, so be necessary to study a kind of flange mould that does not have the die die orifice.

[summary of the invention]

Technical problem to be solved by this invention provides a kind of flange forming method that does not have the die die orifice.

For solving the problems of the technologies described above, the invention provides a kind of in-flanges forming method that does not have the die die orifice, on blank, form the arch bag before the flanging moulding earlier, the radial dimension and the in-flanges obtained by molding endoporus pore size of the bottom port inwall of this arch bag adapt.

The bottom port inwall of arch bag is chosen suitable radial dimension, makes in-flanges obtained by molding endoporus pore size meet the demands.Basic ideas of the present invention are: form the arch bag that adapts with in-flanges obtained by molding endoporus pore size in advance on blank, like this, can under the situation that does not have the die die orifice, control the aperture size of in-flanges obtained by molding endoporus, simultaneously, being pre-formed the arch bag can make the in-flanges moulding more easy, the in-flanges forming force is less, reduces the impact to mould.

For the difficulty that further reduces the in-flanges moulding, reduce impact to mould, before the in-flanges moulding, on blank, offer earlier pre-punched hole.The step of offering pre-punched hole can be after forming the arch bag, before the in-flanges moulding, and pre-punched hole is opened in to encircle and wraps in this case; The step of offering pre-punched hole also can be before forming the arch bag, and in this case, the position of arch bag and flanging is with corresponding with the position of pre-punched hole.

The in-flanges forming method that the present invention does not have the die die orifice can may further comprise the steps:

A. form the arch bag on blank, the radial dimension and the in-flanges obtained by molding endoporus pore size of the bottom port inwall of this arch bag adapt;

B. carry out the flanging moulding;

C. offer pre-punched hole at the formed arch bag of step a middle part;

D. the formed arch bag of step a is carried out the in-flanges moulding.

For the ease of the in-flanges moulding, can adopt the punch of parabolic shaped structure that the formed arch bag of step a is translated into in-flanges in the steps d.

The inventive method is forming the arch bag that adapts with in-flanges obtained by molding endoporus pore size in advance on blank after the flanging moulding, before the in-flanges moulding, solved the flange moulding problem under the less situation of spacing between flanging and the in-flanges effectively, be pre-formed the arch bag and also make the in-flanges moulding more easy, reduced impact mould.

[description of drawings]

For convenience of explanation, the present invention uses following preferred embodiment and accompanying drawing to do to describe in detail.

Fig. 1 is a kind of workpiece that comprises flanging 2 and in-flanges 4.

Fig. 2 adopts a kind of embodiment of the inventive method to process the schematic perspective view of the used retainer piece of workpiece shown in Figure 1.

Fig. 3 adopts a kind of embodiment of the inventive method to process the schematic perspective view of the used die of workpiece shown in Figure 1.

Fig. 4 is the schematic perspective view of the punch of parabolic shaped structure.

Fig. 5 is when adopting a kind of embodiment of the inventive method to process workpiece shown in Figure 1, the half-finished cross-sectional schematic of gained behind the completing steps a.

Fig. 6 is the cross-sectional schematic behind the semi-finished product completing steps b shown in Figure 5.

Fig. 7 is the cross-sectional schematic behind the semi-finished product completing steps c shown in Figure 6.

Fig. 8 is the schematic diagram of analysing and observe behind the semi-finished product completing steps d shown in Figure 7.

[specific embodiment]

In order to process workpiece shown in Figure 1, adopt a kind of embodiment of the inventive method, this method may further comprise the steps:

A. on blank, form the arch bag, the radial dimension and the in-flanges moulding of the bottom port inwall of this arch bag

Gained endoporus pore size adapts;

B. carry out the flanging moulding;

C. offer pre-punched hole at the formed arch bag of step a middle part;

D. the formed arch bag of step a is carried out the in-flanges moulding.

Adopt the punch of parabolic shaped structure shown in Figure 4 that the formed arch bag of step a is translated into in-flanges in the steps d.The shape processing parabolically of the upper end of this punch, this punch has bigger punch-nose angle, is convenient to moulding.

Fig. 5, Fig. 6, Fig. 7, Fig. 8 dissect direction according to the A-A among Fig. 1 semi-finished product and finished product are dissectd to obtain.

During processing and forming, form arch bag 1 according to step a on blank earlier, resulting semi-finished product as shown in Figure 5; Semi-finished product shown in Figure 5 are carried out the flanging moulding, and flanging 2 as shown in Figure 6; Pre-punched hole 3 is offered at arch bag middle part in Fig. 6, and pre-punched hole 3 is concentric with flanging 2, sees Fig. 7.

When the arch bag in the semi-finished product shown in Figure 7 is carried out the in-flanges moulding, earlier semi-finished product shown in Figure 7 are placed between retainer piece shown in Figure 2 and the die shown in Figure 3, semi-finished product among Fig. 7 are positioned at the circular collet 5 (size of the inwall size of collet 5 and flanging 2 outer surfaces is suitable) of retainer piece shown in Figure 2, half-finished bottom 9 among Fig. 7 is replaced with the upper surface 10 of retainer piece, the upper end of the half-finished flanging 2 among Fig. 7 and the outside platform 7 of die are replaced, with semi-finished product, the retainer piece, die the three fix, die, semi-finished product, the retainer piece is arranged from top to bottom successively, punch shown in Figure 4 then passes the retainer piece from bottom to top successively, semi-finished product, die, carry out the in-flanges moulding, in-flanges 4 was replaced with the inner edge platform 6 of die when the in-flanges moulding was finished, there is difference in height (referring to Fig. 3) between inner edge platform 6 and the outside platform 7, this difference in height equals the difference in height (referring to Fig. 1 and Fig. 8) between the in-flanges 4 and flanging 2 on the workpiece, and the binder platform 8 of die can play the effect of part die die orifice in the in-flanges forming process.

Claims

1. in-flanges forming method that does not have the die die orifice is characterized in that: form the arch bag before the flanging moulding earlier on blank, the radial dimension and the in-flanges obtained by molding endoporus pore size of the bottom port inwall that this arch wraps adapt.

2. the in-flanges forming method of no die die orifice according to claim 1 is characterized in that: offer earlier pre-punched hole before the in-flanges moulding on blank.

3. the in-flanges forming method of no die die orifice according to claim 2 is characterized in that: may further comprise the steps:

B. carry out the flanging moulding;

C. offer pre-punched hole at the formed arch bag of step a middle part;

D. the formed arch bag of step a is carried out the in-flanges moulding.

4. according to the in-flanges forming method of claim 1,2 or 3 described no die die orifices, it is characterized in that: adopt the punch of parabolic shaped structure that the formed arch bag of step a is carried out the in-flanges moulding in the steps d.