CN105834271A

CN105834271A - Deep drawing process for keeping inner circular bead unchanged and shrinking outer circular bead of cup bottom

Info

Publication number: CN105834271A
Application number: CN201610193830.XA
Authority: CN
Inventors: 童志刚; 胥波
Original assignee: FINEFORMING PRECISION ENGINEERING Co Ltd
Current assignee: Suzhou Sanwei precision metal products Co.,Ltd.
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2016-08-10
Anticipated expiration: 2036-03-31
Also published as: CN105834271B

Abstract

The invention discloses a deep drawing process for keeping an inner circular bead unchanged and shrinking an outer circular bead of a cup bottom. The process comprises the following steps that (1) drawing is conducted, specifically, a blank is drawn to the required diameter, and the angle of the inner circular bead of the cup bottom of the blank exceeds the angle of the inner circular bead of a final product after drawing; (2) forming is conducted, specifically, the cup bottom is completely formed, the size of the bottom plane is equal to the size required by the final product, the diameter of the inner circular bead of the cup bottom is greater than that of the inner circular bead of the final product, and a semi-finished product is obtained; and (3) thinning and drawing are conducted, specifically, the semi-finished product is machined to the size required by the final product through thinning and drawing, and the final product is obtained. The process is simple, the planeness of the bottom of the obtained final product is good, a new outer circular bead of the product and a drawn product with the approximate sizes of the outer circular bead and the inner circular bead of the cup bottom can be avoided during secondary drawing, and the yield is high.

Description

The technique that the constant bull nose of filleted corner at the bottom of deep drawn cup reduces

Technical field

The present invention relates to a kind of deep drawn processing technique, particularly relate to the technique that the constant bull nose of filleted corner at the bottom of a kind of deep drawn cup reduces.

Background technology

As it is shown in figure 5, fillet radius is as 0.6mm at the bottom of requiring cup with final products, as a example by material thickness is 1.8mm, round radius is normally should be 2.4mm, but is in order at some special requirement, and the radius of bull nose is less than normal radius, i.e. less than 2.4mm.Prior art is mainly by improving increase material by processed product stretching height, extruded by force by the material of increase by subsequent processing fills to the bull nose from upper operation stretching self-assembling formation (in detailed process, the change of shape of processed product is shown in Fig. 6) by unnecessary material again, making final product shape shape as shown in Figure 5, there is following defect in this technique:

1) owing to being product base material thickness to be caused to thicken excess stock extruding by force, then flatten technique by increase and thickening material is thinned and product base plane degree can be deteriorated after thinning again, thus demand can not be met；

2) front operation increases material is by improving stretching height, and rear operation is shorter than front operation due to height of punch when extruding.When mould mold closing, drift and front process part processing product have one section of difference in height, lower mold mold insert is when extruding, difference in height between drift and front process part processing can residual air and drawing oil, thus cause mould choke-out state oil and air cannot empty to show at product filleted corner and have pit at filleted corner on the final product and cause product bad.

Summary of the invention

In order to overcome the deficiencies in the prior art, the invention provides the technique that the constant bull nose of filleted corner at the bottom of a kind of deep drawn cup reduces.

The present invention is achieved through the following technical solutions:

The technique that the constant bull nose of filleted corner at the bottom of a kind of deep drawn cup reduces, including following step:

(1) stretching: stock is stretched to required diameter, and after stretching, at the bottom of the cup of stock, the angle of filleted corner exceedes the filleted corner of final products；

(2) shaping: being fully formed at the bottom of cup, soffit plane size is size needed for final products, its filleted corner diameter, more than the filleted corner diameter of final products, obtains semi-finished product；

(3) ironing: semi-finished product are processed into size needed for final products by ironing, obtain final products.

The technique that the constant bull nose of filleted corner at the bottom of described deep drawn cup reduces, described blank is cylinder.

The technique that the constant bull nose of filleted corner at the bottom of described deep drawn cup reduces, in described step (1), stretching uses continuous stretching die.

The technique that the constant bull nose of filleted corner at the bottom of described deep drawn cup reduces, in described step (1), stretching uses twin shaft punch press.

The technique that the constant bull nose of filleted corner at the bottom of described deep drawn cup reduces, in described step (3), concretely comprising the following steps of ironing: the first make contact of stretching die with semi-finished product is controlled on the inclined-plane of semi-finished product.

The technique that the constant bull nose of filleted corner at the bottom of described deep drawn cup reduces, is final products required form below first make contact.

The beneficial effect that the present invention is reached:

The technique of the present invention is simple, and the final products base plane degree obtained is good, and when can avoid redrawing, product new bull nose occurs and meets bull nose at the bottom of drawn products cup and the close product of filleted corner size, and yields is high.

Accompanying drawing explanation

Fig. 1 is the structural representation after stock stretching.

Fig. 2 is the structural representation of semi-finished product.

Fig. 3 is structural representation during semi-finished product ironing.

Fig. 4 is the structural representation after semi-finished product ironing.

Fig. 5 is the structural representation of final products

Fig. 6 is the shape changing figure of processed product in existing processing technique.

In figure: 1, stretching die, 2, semi-finished product, 3, first make contact, 4, final products.

Detailed description of the invention

The invention will be further described below in conjunction with the accompanying drawings.Following example are only used for clearly illustrating technical scheme, and can not limit the scope of the invention with this.

(1) stretching: as it is shown in figure 1, stock is stretched to required diameter, after stretching, at the bottom of the cup of stock, the angle of filleted corner exceedes the filleted corner of final products；

(2) shaping: as in figure 2 it is shown, be fully formed at the bottom of cup, soffit plane size is size needed for final products, its filleted corner diameter, more than the filleted corner diameter of final products, obtains semi-finished product；

(3) ironing: as shown in Figure 3, the first make contact 3 of stretching die 1 with semi-finished product 2 is controlled on the inclined-plane of semi-finished product 2, first make contact less than 3 is final products required form, by ironing, semi-finished product is processed into size needed for final products, obtains final products as shown in Figure 4.

Specifically, described blank is cylinder, and in described step (1), stretching uses continuous stretching die, uses twin shaft punch press.

Specifically, at the bottom of requiring cup with final products, fillet radius is as 0.6mm, and as a example by material thickness is 1.8mm, stock is diameter 60mm, the cylinder of thickness 1.8mm.

The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, on the premise of without departing from the technology of the present invention principle; can also make some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.

Claims

1. the technique that the constant bull nose of filleted corner at the bottom of deep drawn cup reduces, is characterized in that, including following step:

The technique that the constant bull nose of filleted corner at the bottom of deep drawn cup the most according to claim 1 reduces, is characterized in that, described blank is cylinder.

The technique that the constant bull nose of filleted corner at the bottom of deep drawn cup the most according to claim 1 reduces, is characterized in that, in described step (1), stretching uses continuous stretching die.

The technique that the constant bull nose of filleted corner at the bottom of deep drawn cup the most according to claim 1 reduces, is characterized in that, in described step (1), stretching uses twin shaft punch press.

The technique that the constant bull nose of filleted corner at the bottom of deep drawn cup the most according to claim 1 reduces, is characterized in that, in described step (3), and concretely comprising the following steps of ironing: the first make contact of stretching die with semi-finished product is controlled on the inclined-plane of semi-finished product.

The technique that the constant bull nose of filleted corner at the bottom of deep drawn cup the most according to claim 5 reduces, is characterized in that, is final products required form below first make contact.