CN101850388A - Sheet metal forming die based on radial thrust and back pressure of solid particle medium - Google Patents

Abstract

The present invention is a sheet metal forming die based on radial thrust and back pressure of solid particle medium, including die, punch, lower die holder, ejector rod, ejector block, binder plate, upper die holder, radial cylinder , compression cylinder, briquetting block, pressure head, sealing block, solid particle bottom mold, radial solid particle, etc.; this patent is a new type that combines radially using solid particle medium to increase thrust and solid particle medium to provide back pressure mold. This patent can improve the stress in the deformation area and reduce the load in the force transmission area; it can significantly increase the degree of deformation and is especially suitable for the forming of complex parts; the back pressure provided by the solid particle medium is very easy to realize compared with the liquid medium, and no special is required. Equipment, and solid particles will not leak, do not pollute the environment, and can achieve safe and reliable production. <b/>

Description

Sheet metal forming die based on radial thrust and back pressure of solid particle medium

technical field

The invention belongs to stamping die technology, and in particular relates to a plate forming die whose belt diameter is based on the radial thrust and back pressure of a solid particle medium, aiming at a die that can provide back pressure and radial thrust.

technical background

In the existing stamping dies that can provide back pressure, the back pressure is mostly provided by liquid media. With the back pressure provided by this mold, the pressure is evenly distributed. The existing common forming die has no radial thrust, and the forming is completed by the punch driving the sheet material and pulling it toward the die. For drawing dies with radial hydraulic pressure, the radial thrust is realized by hydraulic pressure, and the drawing dies with hydraulic devices have a more complicated structure and higher cost. The liquid medium will leak and pollute the environment. At the same time, if the liquid medium leaks out, it will splash out, which is prone to safety accidents.

Contents of the invention

The present invention aims at the problem that the existing mold cannot change the resistance of the variable drawbead and the ordinary forming mold has no radial thrust and the sealing problem of the drawing mold with radial hydraulic pressure is difficult to solve. The existing mold that can provide back pressure has the sealing problem It is also a problem that is difficult to solve. A sheet metal forming die with a belt diameter based on the radial thrust and back pressure of the solid particle medium is provided so that the above problems can be solved.

The technical scheme of the present invention is as follows: a sheet material forming die based on the radial thrust and back pressure of solid particle medium, comprising a lower mold base, a concave mold, a punch, and an upper mold base. The mold is installed on the lower mold base, and the blank is formed in the cavity between the die and the punch; the characteristic is that the compression cylinder is installed on the upper mold base, and the working end of the compression cylinder is in contact with the upper surface of the pressure plate , the working end of the radial cylinder is in contact with the upper surface of the pressing block placed in the binder plate, and the lower surface of the pressing block is in contact or connected with the pressure head; the top block is set in the cavity of the die, and the solid particles are set in the top block Above, the position of the top block corresponds to the punch, and the bottom mold cavity is formed between the die, the top block and the blank, and the solid particles fill the bottom mold cavity during molding as a flexible bottom mold;

Corresponding to the position of the pressure head on the die, there is a particle groove, and solid particles are arranged in the particle groove; the pressure head can extend into the particle groove; a sealing block is set between the pressure plate and the die, and the The block and the particle groove of the die and the blank form a radial closed space during the molding process, and the radial solid particles are filled in the closed space

A further feature is that the ejector rod passes through the lower mold base and contacts the lower surface of the ejector block;

The closed spaces are uniformly distributed in the die.

The most important improvement of the present invention is a new type of mold that combines radially using solid particle medium to increase thrust and solid particle medium to provide back pressure.

The invention adopts the solid particle medium to provide the back pressure. Compared with the liquid medium to provide the back pressure mold, the forming is very easy to realize, no special equipment is needed, the solid particles will not leak, the environment will not be polluted, and safe and reliable production can be realized. Liquid medium back pressure, uniform pressure distribution, and solid granular medium back pressure can achieve non-uniform back pressure to prevent local thinning and cracking. The shape of the solid particle medium bottom mold is determined by the shape of the top block, which can be adjusted according to specific needs, and the product quality is higher. This patent combines the advantages of rigid molds and flexible molds, which can effectively improve the degree of deformation of the sheet metal, and the thickness of the product is uniform. This patent can improve the stress situation in the deformation area, reduce the load in the force transmission area, and can significantly increase the degree of deformation, and is especially suitable for forming complex parts.

The structure of the mold is simple, and the radial thrust is transmitted to the sheet by the radial cylinder through the solid particle medium, which can realize safe, reliable and pollution-free production. The mold structure can also be realized by pressing the cylinder, and the radial thrust can be realized by the air cushion of the machine tool. Compared with ordinary forming molds, the forming is easier and the effect is remarkable.

Description of drawings

Fig. 1 is the plate forming die based on the radial thrust and back pressure of the solid particle medium in the present invention

In the figure: 1—lower die base, 2—ejector pin, 3—ejector block, 4—die, 5—binder plate, 6—radial cylinder, 7—punch die, 8—upper die base, 9—press Tight cylinder, 10—briquetting block, 11—pressure head, 12—sealing block, 13—solid particle, 14—radial solid particle, 15—bottom mold cavity, 16—radial closed space, 17—blank, 18—particle groove.

Detailed ways

Referring to Fig. 1, it is shown that a sheet metal forming mold with a belt diameter based on the radial thrust and back pressure of the solid particle medium includes a punch 7, a die 4, a lower mold base 1, a push rod 2, a top block 3, and a pressing material Plate 5, radial cylinder 6, upper mold base 8, compression cylinder 9, briquetting block 10, pressure head 11, sealing block 12, solid particle bottom mold 13, radial solid particle 14, bottom mold cavity 15, radially closed Space 16. The punch 7 is installed on the upper die base 8, the die 4 is installed on the lower die base 1, and the blank 17 is formed in the cavity between the die 4 and the punch 7; the compression cylinder 9 is installed on the upper die base 8, its working end is in contact with the upper surface of the binder plate 5, and the compression cylinder 9 can push the binder plate 5 to move up and down to generate pressure; the radial cylinder 6 is installed on the upper mold base 8, and the work of the radial cylinder 6 The end is in contact with the upper surface of the pressing block 10 placed in the binder plate 5, the lower surface of the pressing block 10 is in contact with or connected to the pressing head 11, and the radial cylinder 6 acts on the pressing head 11 through the pressing block 10, The indenter 11 is radially extended or shortened; the ejector block 3 is arranged in the cavity of the die 4, and the solid particles 13 are arranged on the ejector block 3, and the position of the ejector block 3 corresponds to the punch 7; the ejector rod 2 wears When the lower mold base 1 is in contact with the lower surface of the top block 3, the top block 3 can be lifted up when the ejector rod 2 extends upwards, or an upward force is given to the top block 3, and the top block 3 can be moved when necessary. Move up under the action of push rod 2. A bottom mold cavity 15 is formed between the die 4, the top block 3 and the blank 17. The solid particles 13 are filled in the bottom mold cavity 15 as a flexible bottom mold during molding. The blank 17 is placed in the bottom mold cavity 15 between the punch 7 and the blank 17. The solid particles are molded between the 13 flexible bottom molds; in this way, the solid particles can be prevented from splashing out, preventing environmental pollution, and at the same time achieving safe and reliable production. The shape of the flexible bottom mold made of solid particles 13 is determined by the shape of the top block 3, which can provide non-uniform back pressure, effectively improve the degree of deformation of the sheet metal, and make the thickness of the product uniform.

On the die 4 , corresponding to the position of the pressure head 11 , a particle groove 18 is provided, and solid particles 14 are arranged in the particle groove 18 ; the pressure head 11 can extend into the particle groove 18 . The sealing block 12 is arranged between the pressing plate 5 and the die 4, that is, between the lower end surface of the pressing plate 5 or the upper end face of the die 4, the sealing block 12 and the particle groove 18 of the die 4 and the blank 17 are formed During the process, a radial closed space 16 is formed, and the radial solid particles 14 are filled in the closed space 16; during the mold clamping and forging process, under the action of the indenter 11, the radial solid particles 14 generate thrust in the radial direction, acting on The two ends of the blank 17, the blank 17 is subjected to the radial thrust of the radial solid particles 14 during the forming process. At the same time, the radial closed space 16 can prevent the radial solid particles 14 from splashing out. In the figure, the radial closed spaces 16 formed between the binder plate 5 and the die 4 are evenly distributed in the die 4, so that the radial thrust generated by the radial solid particles 14 is equal. Under the action of the radial cylinder 6 , the pressure head 11 pushes the radial solid particles 14 in the radial closed space 16 to generate radial thrust, which acts on both ends of the blank 17 . Fix multiple radial cylinders 6 on the upper mold base 8 to ensure that the radial solid particles 14 in the uniformly distributed radial closed space 16 act synchronously, ensure that the radial thrust acting on both ends of the blank 17 is equal, and enhance its operation smoothness. In order to ensure that the radial thrusts at the left and right ends are equal, the closed spaces 16 are evenly distributed in the die 4 . The radial thrust of the sheet is exerted by the radial solid particles 14 in the radial closed space 16, the pressure comes from the cylinder, and is pushed by the pressure head 11; the back pressure of the sheet is exerted by the solid particles 13, and the pressure comes from the air cushion, which is pushed Rod 2, top block 3 pass.

The solid particles 13 and the radial solid particles 14 of the present invention mainly use steel balls, steel balls, metal balls or other particles with suitable properties to meet the needs of forming and extrusion.

Claims (3)

1. Sheet metal forming mold based on radial thrust and back pressure of solid particle medium, including mold base (1), die (4), punch (7), upper die base (8), and punch (7) installation On the upper mold base (8), the concave mold (4) is installed on the lower mold base (1), and the blank (17) is formed in the cavity between the concave mold (4) and the punch (7); it is characterized in that : The compression cylinder (9) is installed on the upper mold base (8), the working end of the compression cylinder (9) is in contact with the upper surface of the binder plate (5), and the working end of the radial cylinder (6) is placed on the The upper surface of the pressing block (10) in the pressing plate (5) contacts, and the lower surface of the pressing block (10) contacts or connects with the pressure head (11); the top block (3) is set in the cavity of the die (4) Inside, the solid particles (13) are set on the top block (3), the position of the top block (3) corresponds to the punch (7), and the cavity between the die (4) and the top block (3) and the blank (17) A bottom mold cavity (15) is formed, and solid particles (13) fill the bottom mold cavity (15) during molding as a flexible bottom mold; On the die (4), corresponding to the position of the indenter (11), there is a particle groove (18), and solid particles (14) are arranged in the particle groove (18); the indenter (11) can extend into In the particle groove 18; a sealing block (12) is set between the binder plate (5) and the die (4), and the sealing block (12) and the particle groove (18) and the blank (17) of the die (4) are in the A radial closed space (16) is formed during the forming process, and the radial solid particles (14) are filled in the closed space (16). 2. A sheet metal forming die based on radial thrust and back pressure of solid particle media according to claim 1, characterized in that: the ejector rod (2) passes through the lower mold base (1) and the ejector block (3) contact with the lower surface. 3. A sheet metal forming die based on radial thrust and back pressure of solid granular media according to claim 1, characterized in that: the closed spaces (16) are evenly distributed in the die (4).

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