CN109570359B

CN109570359B - Drawing male die, drawing die and drawing process

Info

Publication number: CN109570359B
Application number: CN201811554550.2A
Authority: CN
Inventors: 何鹏申; 周翔; 范彦东; 曹呈; 张席席; 严佳丽
Original assignee: Anhui Jianghuai Automobile Group Corp
Current assignee: Anhui Jianghuai Automobile Group Corp
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2020-10-09
Anticipated expiration: 2038-12-18
Also published as: CN109570359A

Abstract

The invention discloses a drawing male die, a drawing die and a drawing process, wherein the drawing male die comprises a body, wherein a material flow control groove is arranged on the body, and the extension direction of the material flow control groove is vertical to the feeding direction of a blank; still be provided with blank line and trimming line on the body, keep having preset distance between blank line and the trimming line. According to the drawing male die, the drawing die and the drawing process, the material flow control in the Y direction is realized by arranging the material flow control groove, the formed blank is prevented from rebounding or distorting, wrinkles are eliminated, and meanwhile, the positioning of each process is realized by processing the positioning area between the blank line and the trimming line.

Description

Drawing male die, drawing die and drawing process

Technical Field

The invention relates to the technical field of stamping, in particular to a drawing male die, a drawing die and a drawing process.

Background

Automobile industry in 21 st century to reduce fuel consumption and CO₂And exhaust emissions have become a major social need. To accommodate this trend, steel has developed many types of high strength steel plates to help reduce the mass of automobiles while improving the safety of automobiles. The problems of light weight, collision safety, high-strength punch rebound, die abrasion and the like are considered.

The existing high-strength plates generally adopt a forming or drawing die (mainly adopting an opening). The forming die has the advantages of high material utilization rate and easy modification after rebound; but the defects of poor stability, uneven primary and secondary stress in the forming process, inconsistent primary and secondary strain, easy wrinkling and rebound, stress release and the like are caused. The closed drawing die has the advantages of stable forming, but has the defect that the problem of cracking cannot be solved due to the limitation of ductility of the high-strength plate. The open drawing die has the advantages of high material utilization rate, but has the defects that no material flow control means exists in the opening direction, and the open end has the problems of wrinkling to a certain degree, deviation of the opening direction and difficult positioning.

Disclosure of Invention

The invention aims to provide a drawing and pressing convex die, a drawing die and a drawing process, which are used for realizing material flow control in the Y direction, avoiding the rebound or distortion of a formed blank, eliminating wrinkles and realizing the positioning of each process.

The invention provides a drawing male die, which comprises:

the material flow control device comprises a body, wherein a material flow control groove is formed in the body, and the extending direction of the material flow control groove is perpendicular to the feeding direction of a blank;

the body is further provided with a blank line and a trimming line, and a preset distance is kept between the blank line and the trimming line.

The drawing punch as described above, wherein preferably, the depth of the material flow control groove is gradually reduced from the middle of the body to the direction of the trimming line, and a distance is kept between the end of the material flow control groove and the trimming line.

The drawing punch as described above, wherein, preferably, a scrap knife is further provided on the body.

The invention also provides a drawing die which comprises a lower die holder, wherein the drawing die also comprises the drawing male die provided by the invention, and the drawing male die is arranged on the lower die holder.

The invention also provides a drawing process, which comprises the following steps:

pressing, namely punching the blank into a basic shape and punching a material flow control groove on the blank;

cutting the blank, and removing the part of the blank, which is positioned outside the blank line;

trimming for the first time to obtain a molding profile of the blank, and processing a Y-direction positioning part and an X-direction positioning part on the blank;

shaping to substantially shape the preform;

and trimming for the second time to remove the Y-direction positioning part and the X-direction positioning part.

The drawing process as described above, wherein preferably, the first trimming specifically includes:

three X-direction positioning parts are machined in the length direction of the blank, and the three X-direction positioning parts are uniformly distributed in the length direction of the blank.

The drawing process as described above, wherein preferably, the Y-direction positioning portion is a middle portion of the flow control groove.

The drawing process as described above, wherein preferably, the second trimming specifically includes:

trimming hole positions on the blank;

trimming the side wall of the blank;

and removing the Y-direction positioning part and the X-direction positioning part.

According to the drawing male die, the drawing die and the drawing process, the material flow control in the Y direction is realized by arranging the material flow control groove, the formed blank is prevented from rebounding or distorting, wrinkles are eliminated, and meanwhile, the positioning of each process is realized by processing the positioning area between the blank line and the trimming line.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

FIG. 1 is a view of the blank as it begins to be formed on a drawing punch;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a top view of the blank prior to first trimming;

FIG. 4 is a top view of the blank prior to reforming;

fig. 5 is a top view of the blank prior to the second trimming.

Description of reference numerals:

100-preform 110-nip region 200-flow control channel

300-trimming line 400-blank line 500-scrap cutter 500

600-Y positioning part 700-X positioning part 800-trimming line

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

Referring to fig. 1 to 5, an embodiment of the present invention provides a drawing punch, including a body, a material flow control groove disposed on the body, and an extending direction of the material flow control groove is perpendicular to a feeding direction of a blank; the body is further provided with a blank line 400 and a trimming line 300, and a preset distance is kept between the blank line 400 and the trimming line 300.

Wherein, through the material flow control groove on the body, a corresponding material flow control groove can be formed on the blank as shown in figure 1. Compared with the prior art, the material flow control groove is arranged, so that the material flow control of the end part of the body in the Y direction is realized, and the Y-direction springback and distortion caused by the fact that the strain in the Y direction is far smaller than the strain in the X direction during drawing forming are avoided; thereby guaranteed the stability of material flow among the forming process, improved the shaping quality of finished piece, solved finished piece tip fold problem simultaneously. In addition, a preset distance is kept between the blank line 400 and the trimming line 300, so that a positioning area can be machined at the part between the blank line 400 and the trimming line 300, the subsequent process can be conveniently positioned, and the problem of difficulty in positioning in the prior art is solved. Wherein, Y direction is the feeding direction of the blank, and X direction is the direction vertical to the Y direction.

Further, as shown in fig. 1 and 2, the depth of the flow control groove 200 is gradually reduced from the middle of the body to the trimming line 300, and a distance is maintained between the end of the flow control groove 200 and the trimming line 300. That is, the depth of the material flow control groove 200 is gradually reduced from the middle part of the male die to two sides, so that the material flow resistance is too large to cause the cracking of the blank while the closed opening is prevented from being formed around the material flow control groove 200 and the draw bead.

Further, as shown in fig. 3, a waste material knife 500 may be further disposed on the body to cut off waste material and ensure smooth sliding of the waste material.

The embodiment of the invention also provides a drawing die which comprises a lower die holder and a drawing convex die provided by any embodiment of the invention, wherein the drawing convex die is arranged on the lower die holder.

The embodiment of the invention also provides a drawing process, which comprises the following steps:

step S1, swaging, punching the preform 100 into a basic shape, and punching the flow control groove 200 in the preform 100.

Specifically, the blank may be fed by a feeding device to the drawing punch the blank 100 to be formed, and further punched to preliminarily form the blank 100.

The Y-positioning part 600 may be a middle portion of the material flow control groove 200, so that the Y-positioning part 600 may be formed on the basis of the material flow control groove 200, and no additional process is required, thereby simplifying the process steps and improving the production efficiency.

And step S2, cutting the blank, and removing the part of the blank, which is positioned outside the blank line 400.

As shown in FIG. 1, a swage area 110 is typically reserved on the preform 100 to facilitate positioning of the preform 100 during initial forming; after the preform 100 is initially formed, the slug portion 110 may be cut away to provide the preform 100 shown in FIG. 3, thereby facilitating subsequent processing.

Step S3, first trimming to obtain the molded contour of the blank 100, and machining the Y-positioning part 600 and the X-positioning part 700 on the blank 100.

As shown in fig. 4, the X-direction positioning part 700 and the Y-direction positioning part 600 are both scraps to be cut off, so that the blank can be positioned in its entirety in each process by the parts of the blank 100 other than the region to be formed, and the blank to be formed is not damaged, thereby ensuring the forming quality.

It will be appreciated that, since the blank 100 is long in the feeding direction, in order to secure the positioning stability of the blank, three X-direction positioning portions 700 may be formed in the blank 100 in the longitudinal direction thereof, and the three X-direction positioning portions 700 are uniformly distributed in the blank 100 in the longitudinal direction thereof.

And step S4, shaping to substantially shape the preform 100.

Step S5, secondary trimming, to remove Y-positioner 600 and X-positioner 700.

Specifically, the second trimming specifically includes:

and step S51, trimming the hole position on the blank 100.

And step S52, trimming the side edges of the blank 100.

Step S53, removing the Y-positioning part 600 and the X-positioning part 700, and specifically, removing and trimming the blank 100 according to the trimming line 800 shown in fig. 5.

According to the drawing male die, the drawing die and the drawing process provided by the embodiment of the invention, the material flow control in the Y direction is realized by arranging the material flow control groove, the formed blank is prevented from springing back or twisting, the wrinkles are eliminated, and meanwhile, the positioning of each process is realized by processing the positioning area between the blank line and the trimming line.

The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims

1. A drawing punch characterized by comprising:

the body is also provided with a blank line and a trimming line, and a preset distance is kept between the blank line and the trimming line;

the depth of the material flow control groove is gradually reduced from the middle of the body to the direction of the trimming line, and a distance is kept between the end part of the material flow control groove and the trimming line.

2. Drawing punch according to claim 1, characterised in that the body is also provided with a scrap knife.

3. A drawing process using the drawing punch as claimed in claim 1 or 2, characterized by comprising the steps of:

shaping to substantially shape the preform;

trimming for the second time to remove the Y-direction positioning part and the X-direction positioning part;

the first trimming specifically comprises:

processing three X-direction positioning parts in the length direction of the blank, wherein the three X-direction positioning parts are uniformly distributed in the length direction of the blank;

the Y-direction positioning part is the middle part of the material flow control groove.

4. The drawing process according to claim 3, wherein the second trimming specifically comprises:

trimming the hole sites on the blanks;

trimming the side wall of the blank;