CN102744328A - Method for manufacturing high strength steel plate hot stamping die - Google Patents

Abstract

The invention discloses a method for manufacturing a high strength steel plate hot stamping die and belongs to the technical field of hot stamping forming. Aims at the manufacturing problem that shape follow-up cooling water channels are arranged in bent molded surfaces of male and female dies of the hot stamping die, the method is disclosed. The method comprises the following steps of: firstly, according to the shapes of the molded surfaces of the male and female dies of the die, bending the cooling water channels and connecting the cooling water channels into a pipeline system; then dividing the male and female dies into processing blocks according to the shape follow-up cooling water channels and processing grooves for placing the shape follow-up cooling water channels; and placing the shape follow-up cooling water channels into the grooves; and correspondingly combining and fixing the processing blocks to form a male and female die structure in which the shape follow-up cooling water channels are arranged. The method adopts the process scheme of manufacturing the cooling water channels, cutting the male and female dies, processing the grooves of the cooling water channels, placing the cooling water channels into the grooves and combining and fixing the male and female die processing blocks. According to the process scheme, the hot stamping die of which the cooling water channels follow up the shapes of the molded surfaces of the male and female dies and are at the equal distances with the molded surfaces of the male and female dies of the die can be manufactured; and a high strength steel plate hot stamping part with a uniform cooling effect can be processed by the die.

Description

A method for manufacturing a high-strength steel plate hot stamping die

Technical field:

The invention provides a method for manufacturing a high-strength steel plate hot stamping die, which belongs to the technical field of hot stamping forming.

Background technique:

Energy saving, environmental protection, safety, and comfort are the general trends in the development of the automobile industry today, and reducing fuel consumption, energy saving, and emission reduction are hot issues of global concern today. The lightweight technology of automobiles is undoubtedly an effective way to solve this problem. However, in order to realize the lightweight of the car, in addition to optimizing the design of the car structure, it is also possible to use lightweight materials to manufacture car body components. As a typical representative of lightweight materials, high-strength and ultra-high-strength steel plates have become one of the most important means of lightweighting automobiles due to their light weight and high strength. Compared with ordinary steel plates, high-strength steel plates have higher yield stress and tensile strength, but lower hardening index and thickness anisotropy coefficient, lower elongation, poor stamping ability at room temperature, and are prone to cracking , wrinkling, rebound and other defects, while the mold wear is more serious, which greatly reduces the service life of the mold. Therefore, the traditional cold stamping forming process can no longer fully meet the needs of technology and production development, so a new hot stamping forming technology has emerged to solve the limitations of the above-mentioned formability of high-strength steel plates. Hot stamping technology is to heat the high-strength steel plate to a certain temperature at a high temperature in a special heating device, and keep it warm for a period of time to make it fully austenitized, and then quickly transfer it to a hot stamping die for rapid forming. At the same time, use hot stamping The cooling device installed in the mold quenches and cools the workpiece, so as to obtain an ultra-high-strength steel member with a uniform martensitic structure and a strength above 1500MPa. The core of this technology is to quench the sheet metal while forming, that is, the hot stamping die should have excellent cooling ability while meeting the forming requirements of the parts. The cooling system of the hot stamping die is a cooling water channel designed at a certain thickness below the convex and concave surface of the mold. The cooling water channel can be processed by mechanical processing, and circulating cooling water is passed into the cooling water channel to cool the convex and concave mold The model surface, thereby cooling the formed part, realizes the quenching of the formed part.

Usually, the cooling channel of the hot stamping die is designed as a straight circular hole and processed by a drilling machine. When the cooling water channel is designed to conform to the curved convex and concave model surfaces, the drilling machine will not be able to perform conformal processing, which will result in unequal distances from the inner surface of the cooling water channel to the convex and concave model surfaces, which will inevitably affect the cooling of the workpiece effect, affecting the organizational performance of the workpiece.

The invention proposes a novel method for manufacturing a high-strength steel plate hot stamping die, which solves the problem that the conventional processing method cannot process conformal cooling water channels on curved convex and concave model surfaces.

Invention content:

The conformal cooling channel has the advantages of high cooling efficiency and good cooling uniformity, but it brings challenges to the traditional mold manufacturing technology due to its conformal three-dimensional structure.

The invention proposes a method for manufacturing a high-strength steel plate hot stamping die, which mainly solves the problem that the conventional processing method cannot process conformal cooling water channels on curved convex and concave mold surfaces.

A method for manufacturing a high-strength steel plate hot stamping die, comprising the following steps in conjunction with the accompanying drawings:

a) Manufacture of cooling water channel: according to the combination of the curved shape of the mold punch 2 and the concave mold 1, a conformal space cooling water channel 3 is manufactured;

b) Dividing the convex and concave molds: taking the central position 4 of the cooling channel as the cutting plane, dividing the convex and concave molds into processing blocks 5, 6, 7, and 8;

c) Cooling channel groove processing: machining grooves 9, 10, 11, 12 for placing cooling channels on the convex and concave die cutting surfaces 4;

d) Placement of cooling water channels: Place the cooling water channels in the grooves 9, 10, 11, and 12 processed on the cutting surfaces 4 of the convex and concave molds, and precisely position them according to the curved shape of the convex and concave mold surfaces;

f) Combining and fixing the processing blocks of the convex and concave molds: the processing blocks corresponding to the convex and concave molds are fixed through 13 combinations to obtain the convex and concave mold structures with built-in conformal cooling channels.

The manufacturing of the cooling water channel is a combined conformal space cooling water channel 3 made by cutting, bending, welding and screw connection.

The split punch 2 and die 1 are divided into two processing blocks 5, 6, 7 with the central position 4 of the cooling water channel as the cutting plane by using methods such as wire electric discharge cutting or laser cutting. ,8.

The cooling water channel groove processing is to process the grooves 9, 10, 11, 12 for placing the cooling water channel on the cutting surface 4 of the convex and concave mold blocks by mechanical processing.

The described combined fixed convex and concave mold processing block is after the cooling channel is accurately positioned according to the curved shape of the convex and concave mold surfaces and placed in the processed groove, and then the two parts of the fixed convex and concave molds are respectively combined and fixed by screw connection 13. processing block.

Compared with traditional hot stamping die manufacturing methods, it has the following advantages:

The invention can be used to manufacture a hot stamping die with a conformal three-dimensional space structure cooling water channel. The cooling channel of the traditional hot stamping die is designed as a straight circular hole and processed by a drilling machine. When the cooling channel is designed to conform to the curved convex and concave model surfaces, the drilling machine cannot perform conformal processing, resulting in unequal distances from the inner surface of the cooling channel to the convex and concave model surfaces, which will inevitably affect the cooling effect of the workpiece , affecting the organizational performance of the workpiece. The invention bends the cooling water channel according to the surface shape of the convex and concave molds of the mold, and connects them into a pipeline system, then divides the convex and concave molds into processing blocks according to the conformal cooling water channel, and processes the grooves for placing the conformal cooling water channel, Put the conformal cooling water channel into the groove, and combine the corresponding fixed processing blocks to form a convex and concave mold structure with built-in conformal cooling water channel, which ensures that the cooling water channel conforms to the shape, and the distance from the convex and concave model surfaces of the mold is equal everywhere, and it can also Prevent cooling water leakage from damaging the mold. The die can be used to process high-strength steel plate hot stamping parts with uniform cooling effect.

Description of drawings:

Fig. 1 Stereoscopic view of convex and concave mold structures.

Fig. 2 schematic diagram of mold manufacturing method, wherein:

Figure 2(a) Manufacturing of cooling channels;

Figure 2(b) The central position of the cooling channel is the cut plane;

Fig. 2 (c) die processing block;

Figure 2(d) punch processing block;

Fig. 2 (e) Processing cooling channel grooves on the cutting surface of the die;

Fig. 2(f) Processing cooling channel grooves on the cutting surface of the punch;

Fig. 2 (g) Combine and fix the die processing block after being placed in the cooling water channel;

Figure 2(h) Combine and fix the punch processing block after putting in the cooling water channel.

Fig. 3 Flow chart of mold manufacturing method.

In the figure: 1. Die structure 2. Punch structure 3. Cooling channel 4. Cutting surface 5. Die processing block 6. Die processing block 7. Convex die processing block 8. Convex die processing block 9. Cooling channel concave Groove 10. Cooling channel groove 11. Cooling channel groove 12. Cooling channel groove 13. Threaded connector

Detailed ways:

The content and specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

Figure 1 is a structural diagram of the convex and concave dies of the hot stamping die. Firstly, according to the curved shape of the mold punch 2 and the die 1, the metal pipe is made into a combined conformal three-dimensional cooling water channel 3 by means of cutting, bending, welding and screw connection, see Figure 2(a). In order to put the bent conformal three-dimensional space cooling water channel into the convex and concave molds, and the distance from the convex and concave model surfaces of the mold is equal everywhere, taking the center position 4 of the cooling water channel as the cutting plane, refer to Figure 2(b), use The convex and concave molds are divided into two processing blocks 5, 6, 7, and 8 by methods such as wire electric discharge cutting or laser cutting, see Fig. 2(c) and Fig. 2(d). Grooves 9, 10, 11, 12 for placing cooling water channels are machined on the cutting surfaces 4 of the convex and concave dies by machining methods such as milling and grinding, see Fig. 2(e) and Fig. 2(f). Place the conformal cooling water channels 3 in the processed grooves 9, 10, 11, 12 on the cutting surfaces 4 of the convex and concave molds, and precisely position them according to the curved shape of the convex and concave mold surfaces to ensure the distance from the convex and concave mold surfaces of the mold Everywhere is equal, and then use screw connection 13 to combine and fix the two processing blocks of the convex and concave molds respectively, referring to Figure 2(g) and Figure 2(h), to obtain the structure of the convex mold and the concave mold with built-in conformal cooling channels.

A high-strength steel plate hot stamping die manufacturing method proposed by the invention solves the problem that the traditional processing method cannot process the conformal cooling channels on the curved convex and concave mold surfaces, and has important guiding significance for actual production.

Claims (5)

1. high strength steel plate hot stamping die manufacturing approach is characterized in that manufacture technology scheme is following:

A) cooling water channel manufacturing: the space cooling water channel (3) that produces conformal according to mould punch (2), the combination of die (1) profile curved shape;

B) cut apart protruding, die: with cooling water channel center (4) is the branch tangent plane, and protruding, die are divided into processing block (5), (6), (7), (8);

C) cooling water channel groove processing: divide tangent plane (4) to go up groove (9), (10), (11), (12) that machining goes out to be used to place cooling water channel at protruding, die;

D) cooling water channel is inserted: cooling water channel is positioned in groove (9) that protruding, die divides tangent plane 4 to process, (10), (11), (12), accurately locatees with protruding, die profile curved shape;

F) combination fixed convex, die processing block: protruding, the pairing processing block of die are fixed through (13) combination, obtained punch, the die structure of built-in conformal cooling water channel.

2. a kind of high strength steel plate hot stamping die manufacturing approach according to claim 1 is characterized in that, described cooling water channel manufacturing is the combined type conformal space cooling water channel of processing through cutting, bending, welding and thread connection (3).

3. a kind of high strength steel plate hot stamping die manufacturing approach according to claim 1; It is characterized in that; Describedly cut apart punch (2), die (1) is to utilize methods such as Wire EDM or cut; With cooling water channel center (4) is the branch tangent plane, and protruding, die are divided into two processing blocks (5), (6), (7), (8) respectively.

4. a kind of high strength steel plate hot stamping die manufacturing approach according to claim 1; It is characterized in that the processing of described cooling water channel groove is to utilize the method for machining on the branch tangent plane (4) of protruding, die piecemeal, to process groove (9), (10), (11), (12) that are used to place cooling water channel.

5. a kind of high strength steel plate hot stamping die manufacturing approach according to claim 1; It is characterized in that; Described combination fixed convex, die processing block are after cooling water channel is accurately located and be positioned in the manufactured groove with protruding, die profile curved shape, utilize thread connection (13) to make up two processing blocks of fixed convex, die respectively.

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