CN203621222U - Drawing die - Google Patents

Abstract

The utility model discloses a drawing die, relates to the technical field of car manufacturing, and aims to avoid wrinkling of stamped parts and increase material utilization rate. The drawing die comprises a male die, a binder ring and a female die. The binder ring is disposed at the edge between the female die and the male die. The male die combines with the female die to form a cavity. The cavity is a structure with a differential part. The corner of a parting line of the drawing die is provided with a recess part. The recess part is close to the differential part of the cavity. The drawing die is mainly used for punching sheet metal.

Description

A drawing die

technical field

The utility model relates to the technical field of automobile manufacturing, in particular to a drawing die for punching and forming sheet metal parts.

Background technique

Nowadays, most of the sheet metal parts in automobiles, heavy industry and many machinery and electrical equipment are stamped by drawing dies. Drawing dies play a very important role in the field of automobile sheet metal parts manufacturing.

The drawing die is usually composed of three major parts: a punch, a die, and a blank holder, and most of the stamped parts that are stamped and formed have a structure with ups and downs, thus forming a ladder-like or ladder-like structure. Since the material always flows to the place where the profile is low during stamping, and it is difficult to control the uniformity of the feeding, the stamping parts lose stability and are relatively easy to wrinkle in the drop part, which affects the quality of the stamping parts.

For this reason, the existing technology proposes a solution, that is, when using a drawing die for stamping and molding, the "leftover meat" is used to fill up the drop part of the stamping part, so as to slow down the wrinkling of the drop part, and at the same time, the parting line adopts Smooth large corner transitions without sharp corners. Although this method of "remaining meat" can solve wrinkling, "remaining meat" is an unnecessary part of the stamped part, so the size of the stamped blank will be relatively large and the material utilization rate will be reduced.

Utility model content

The embodiment of the utility model provides a drawing die, which can better improve the utilization rate of materials while avoiding wrinkling of stamping parts.

In order to achieve the above object, the embodiments of the present utility model adopt the following technical solutions:

The utility model provides a drawing die, which comprises a punch, a blank holder, and a die. The edge portion between the die and the punch is provided with the blank holder, and the punch A mold cavity is formed after closing the die with the die, the cavity has a structure of a drop portion, a concave portion is provided at the corner of the parting line of the drawing die, and the concave portion is close to the drop of the cavity department.

Further, the concave part is arc-shaped.

Wherein, the corners of the edge of the die form a convex surface protruding to the cavity, the corners of the edge of the punch form a concave surface corresponding to the convex surface, and the concave surface and the convex surface cooperate to form the parting mold. The depression of the line.

Further, the corner of the edge of the blank holder corresponding to the concave surface is a convex surface.

The embodiment of the utility model provides a punch, a blank holder, and a die, the edge portion between the die and the punch is provided with the binder ring, and the punch and the die Form cavity after mold closing, described cavity has the structure of drop portion, the corner of parting line of described drawing mold is provided with recessed portion, and described recessed portion is close to the drop portion of described cavity, can like this Make the recessed part close to the drop part of the stamping part. During the sheet metal forming process, the drop part of the stamping part that is easy to wrinkle is pressed by the recessed part, so as to avoid the phenomenon of wrinkling to the greatest extent; because the utility model does not adopt the " The method of "remaining meat" is used to alleviate the wrinkling of stamping parts, so the size of stamping blanks can be made smaller, and the utilization rate of materials can be better improved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the schematic diagram that the parting line in the drawing die provided by the embodiment of the present invention has a concave part;

Fig. 2 is the enlarged schematic diagram of part A in Fig. 1;

Fig. 3 is a schematic diagram of a stamped part after being stamped and formed by the drawing die provided by the embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

First of all, for the drawing die, in the whole process of stamping the sheet, it usually goes through three processes of mold opening, mold closing and mold opening, and the whole process is defined as a stroke. When the mold is opened, the blank holder will be lifted up, which is slightly higher than the punch (fixed mold), and then the stamping part will be put into the middle of the drawing mold; then the concave mold (moving mold) will move downward and start to enter the closed mold state ; After the stamping part is pressed by the die and the blank holder, the continuous downward movement makes the punch bring the entire stamping part into the die, thus completing the entire drawing process. During the stamping process, the blank will flow from the high profile to the low profile, making the drop part of the stamping part prone to wrinkling. In order to avoid this phenomenon, the embodiment of the present invention provides a drawing die as described below.

Fig. 1 is the schematic diagram that the parting line in the drawing die provided by the embodiment of the present invention has a concave part. Convex die, die, also can not affect understanding embodiment of the present utility model.

Referring to Figures 1 and 2, the drawing die includes a punch, a blank holder 1, and a die, and the edge portion between the die and the punch is provided with the blank holder 1, and The punch mold and the concave mold are molded together to form a mold cavity, the mold cavity has a structure of a drop portion, a depression is provided at the corner of the parting line 2 of the drawing mold, and the depression 20 is close to The drop part of the cavity, so that the concave part can be close to the drop part of the stamping part. During the sheet material forming process, the drop part of the stamping part that is easy to wrinkle is pressed by the concave part, and the occurrence of wrinkling can be avoided to the greatest extent. phenomenon; in addition, because the utility model does not adopt the method of filling up "leftover meat" to alleviate the wrinkling of the stamping parts, the size of the blank stamping parts can be made relatively small, and the utilization rate of materials can be better improved.

As a preferred solution, the above-mentioned concave portion 20 may be in the shape of an arc, and such an arc-shaped concave portion can better control the uniformity of the flow direction of the web, and thus can better avoid wrinkling. Of course, the blank holder force can also be increased to further eliminate wrinkling.

For the concave part 20 of the parting line, it can specifically: form a convex surface protruding to the cavity at the corner of the edge of the die, and form a concave surface corresponding to the convex surface at the corner of the edge of the punch, the The concave surface cooperates with the convex surface to form the concave part 20 of the parting line 2 .

As a further preferred solution of the present invention, the corner of the edge of the blank holder 1 corresponding to the concave surface is also a convex surface.

The characteristics of this drawing die are described in conjunction with Fig. 1-Fig. 3. During the stamping process of the die, when the die moves downward and cooperates with the blank holder 1 to press the stamping part, the drawing die will press the stamping die when it is in this shape and the punch is formed. The boundary of the part is pressed, and at the same time, the concave part of the parting line presses the part of the height difference of the stamping part. In order to better avoid wrinkling, the concave part can also be made in a circular arc shape, so that the blank holder ring can be driven by the die. 1. When the downward movement is formed with the punch, the drop part will not wrinkle. The part B marked in Fig. 3 is a drop part, and there is no phenomenon after being stamped and formed by the drawing die provided by the embodiment of the present invention.

The drawing die provided by the embodiment of the utility model can punch and form various parts, such as the inner door, the outer panel, the upper column of the side wall, and the like.

The above are only specific embodiments of the present utility model, but the scope of protection of the present utility model is not limited thereto. Anyone familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present utility model. All should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (4)

1. a drawing die, it is characterized in that, comprise punch, blank holder, die, edge part between described die and described punch is provided with described blank holder, and form die cavity after described punch and described die matched moulds, described die cavity has the structure of fall-part, and the corner of the die parting line of described drawing die is provided with depressed part, and described depressed part is near the fall-part of described die cavity.

2. drawing die according to claim 1, is characterized in that, described depressed part is circular arc.

3. drawing die according to claim 1 and 2, it is characterized in that, the corner at described die edge forms protruding in described die cavity convex surface, and the corner at described punch edge forms the concave surface corresponding with described convex surface, and described concave surface and described convex surface match and form the depressed part of described die parting line.

4. drawing die according to claim 3, is characterized in that, the corner that described blank holder edge is corresponding with described concave surface is convex surface.

Images