CN104815901A - Supercharged composite mold - Google Patents

Abstract

The invention relates to a pressurizing composite die, which comprises an upper die holder and a lower die holder which are oppositely arranged, wherein a male die is arranged on the upper die holder, a female die is arranged on the lower die base, a pressing plate for pressing the blank holder of the stamped forming part is arranged on the female die, the female die comprises a female die plate and a coaming plate for connecting a lower die seat and the female die plate, the lower die holder, the concave die plate and the enclosing plate form a molding cavity, the concave die plate is provided with a molding hole for the convex die to enter and exit the molding cavity, a 0.5mm steel bead layer and a rubber layer are arranged in the molding cavity, the male die is tightly attached to one side surface of the stamping molding piece, the 0.5mm steel ball layer closely wraps the other side face of the stamping part, the 0.5mm steel balls are arranged between the stamping part and the rubber layer in a rolling mode, and the rubber layer is filled between the inner side wall of the forming cavity and the 0.5mm steel ball layer.

Description

Supercharged composite mold

technical field

The invention relates to a die, which belongs to the technical field of metal stamping.

Background technique

Stamping processing in mechanical processing occupies an important position in the processing industry of the national economy. The application fields of sheet metal parts are extremely wide, and they penetrate into all aspects of the manufacturing industry. Sheet metal forming is mainly realized by stamping dies. Using the stamping process, it has a series of advantages such as high precision, high efficiency, good quality, cost saving, material and energy saving.

Use rubber instead of punch (or die), only need a rigid die (or punch), which simplifies the structure of the mold and reduces the cost of the mold. At the same time, there is no fluidity in rubber, and there is no need to consider the sealing problem in hydroforming, so it is easy to operate; and rubber can form some parts with complex shapes at one time, such as: asymmetric parts, inclined bottom parts, parts with local convex and concave shapes, etc.; Also, rubber molding has the advantage of quick response. However, the applicant found that rubber is used instead of the punch (or die), because rubber is a continuous elastic body, so the moldability is poor when forming parts with complex shapes, especially in small rounded corners. appear particularly prominent.

At the same time, the applicant found that in stamping formed parts, in order to effectively reduce the occurrence of forming defects and improve the surface quality of the formed part, an appropriate medium pressure must be applied during the forming process to suppress the thinning of the sheet, reduce the stress on the dangerous section, and improve the forming process. limit, making the wall thickness of the formed part more uniform.

Further, the applicant discovered that steel balls have the characteristic of transmitting non-uniformly distributed internal pressure. During the forming process, the downward movement of the punch forces the steel ball to move around, and the steel ball rolls on the surface of the formed part, which changes the stress state of the material and improves the forming quality of the formed part. Therefore, the pressure distribution can be adjusted by adjusting the parameters of the forming process, so that the material can be deformed under the most favorable stress conditions, preventing premature rupture of the easily thinned area of the material during the forming process, and giving full play to the plastic deformation performance of the material , to increase the forming limit of the material.

At the same time, the applicant found that by increasing the pressurization of the punch, on the basis of the existing press, the pressure on the formed part can be further improved. At the same time, on the basis of the first stamping of the formed part, the The secondary pressurization of the molded parts can effectively prevent the rebound of the molded parts.

Contents of the invention

The technical problem to be solved by the present invention is to propose a pressurized composite die with fast response to stamping pressure and good overall quality of formed parts in view of the deficiencies in the prior art.

The technical solution proposed by the present invention to solve the above technical problems is: a pressurized composite mold, including an upper mold base and a lower mold base that are oppositely arranged, the upper mold base is provided with a punch, and the lower mold base is provided with There is a die, and the die is provided with a pressure plate for pressing the edge of the stamped part. The pressurized cavity for connecting the external hydraulic oil input is formed inside the die, and the die includes a die plate and a lower die seat connected With the coaming plate of the concave formwork, the lower mold base, the concave formwork and the coaming plate form a forming cavity, the concave formwork is formed with forming holes for the punch to enter and exit the forming cavity, and a 0.5mm steel ball layer is arranged in the forming cavity and a rubber layer, the punch is closely attached to one side of the stamped part, the 0.5mm steel ball layer tightly wraps the other side of the stamped part and the 0.5mm steel ball is rolled between the stamped part and the rubber layer, The rubber layer is filled between the inner wall of the molding cavity and the 0.5mm steel ball layer.

The beneficial effects of adopting the above technical solution in the present invention are: 1) Since the 0.5mm steel ball layer tightly wraps the other side of the stamped part and the 0.5mm steel ball is rolled between the stamped part and the rubber layer, the rubber layer is filled inside the forming cavity Between the wall and the 0.5mm steel ball layer, through the rubber layer, the response to the stamping pressure is fast. On the basis of fast response to stamping pressure, through the 0.5mm steel ball layer, through the steel ball of 0.5mm size, during the forming process, the punch moves down to force the steel ball to move around, and the steel ball rolls on the surface of the formed part, changing the shape of the material. Stress state improves the forming quality of stamping parts. At the same time, through the interaction between the 0.5mm steel ball layer and the rubber layer, the 0.5mm steel ball layer is pressed deeper into the rubber layer where the force of the formed part is greater, achieving uniform force and reducing stress on dangerous sections. Increase the forming limit and make the wall thickness of the formed parts more uniform; 2) Since the pressurized cavity for connecting the external hydraulic oil input is made inside the punch, the hydraulic oil can be injected from the outside to realize the secondary pressurization of the stamped formed parts, which is more Good to improve the quality of stamped parts.

The improvement of the above technical solution is: the rubber layer is at least two layers of rubber layers arranged in sequence up and down.

Since the rubber layer is at least two layers of rubber layers arranged in sequence, in actual production, each layer of rubber layer can be set to a different pressure according to the different pressure requirements of the formed part, which can better improve the forming quality of the formed part.

The improvement of the above technical solution is that: the lower mold base is provided with a ejector pin for ejecting the stamped formed part.

The improvement of the above technical solution is: the molding cavity is provided with a top plate, the top plate is located between the lower mold base and the rubber layer, and the top plate is fixed to one end of the ejector rod.

The working method of the pressurized composite mold is characterized in that it includes: after the punch presses and fits the stamped molded parts, then the external hydraulic oil is input into the pressurized chamber in the punched mold to further squeeze the stamped molded parts .

Description of drawings

Fig. 1 is a structural schematic diagram of a pressurized composite mold according to an embodiment of the present invention.

Detailed ways

The pressurized composite mold of this embodiment, as shown in FIG. 1 , includes an upper mold base 1 and a lower mold base 2 which are arranged oppositely. The upper mold base 1 is provided with a convex mold 3 , and the lower mold base 2 is provided with a die 4 . The die 4 is provided with a pressing plate 6 for pressing the edge of the formed part 5 .

The punch 3 is internally formed with a pressurization chamber 3-1 for connecting external hydraulic oil input. The die 4 includes a die plate 4-1 and a coaming plate 4-2 connecting the lower die base 2 and the die plate 4-1. The lower mold base 2, the concave template 4-1 and the shroud 4-2 form a molding cavity. The concave template 4-1 is shaped on the forming hole that is used for the punch 3 to pass in and out of the forming cavity. A 0.5mm steel ball layer 4-3 and a rubber layer 4-4 are provided in the molding cavity.

The punch 3 is closely attached to one side of the stamped part 5, the 0.5mm steel ball layer 4-3 tightly wraps the other side of the stamped part 5, and the 0.5mm steel ball is rolled between the stamped part 5 and the rubber layer 4-4 between. The rubber layer 4-4 is filled between the inner wall of the forming cavity and the 0.5mm steel ball layer 4-3.

The rubber layer 4-4 of the present embodiment is at least two layers of rubber layers arranged up and down sequentially.

The lower mold base 2 of this embodiment is provided with an ejector pin 7 for ejection of the stamped part 5 .

A top plate 8 is provided in the molding cavity of this embodiment. Top plate 8 is positioned between lower mold base 2 and rubber layer 4-4, and one end of top plate 8 and push rod 7 is fixed.

When in use, after the stamping die 3 presses and fits the stamping forming part 5, the external hydraulic oil is input into the booster chamber 3-1 in the punching die 3 to further squeeze the stamping forming part 5.

The present invention is not limited to the above-mentioned embodiments. All technical solutions formed by equivalent replacements fall within the scope of protection required by the present invention.

Claims (2)

1. A pressurized composite mould, comprising an upper mold base and a lower mold base set relatively, the upper mold base is provided with a punch, the lower mold base is provided with a die, and the die base is provided with a The pressure plate used for stamping and forming parts is characterized in that: the punch is formed with a pressurized chamber for connecting external hydraulic oil input, the die includes a die plate and a coaming plate connecting the lower die base and the die plate, The lower mold base, concave template and coaming plate form a molding cavity, and the concave template is shaped on a molding hole for the punch to enter and exit the molding cavity. A 0.5mm steel ball layer and a rubber layer are provided in the molding cavity. The mold is closely attached to one side of the stamped part, the 0.5mm steel ball layer tightly wraps the other side of the stamped part and the 0.5mm steel ball is rolled between the stamped part and the rubber layer, and the rubber layer is filled in the molded part. Between the inner wall of the cavity and the 0.5mm steel ball layer. 2. A working method for a pressurized composite mold as claimed in claim 1, characterized in that it comprises: after the punch presses and fits the stamped part, then the external hydraulic oil is input into the pressurized chamber in the punch to Stamped parts are further extruded.