阅读说明：本技术 具有柔性的上冲头装置 (Upper punch device with flexibility ) 是由 钱俊松 石义官 刘彬 李全俊 岳显 胡翔 何川 张向南 许杰淋 齐铭 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种具有柔性的上冲头装置,包括壳体和布置在壳体上端的垫板,壳体内设置有上冲头,壳体内设置有活塞,上冲头嵌入式的布置在活塞内,壳体底部设置有盖板,活塞下端设置有冲头盖；所述活塞与垫板间隔一定距离布置；活塞、壳体和垫板之间形成腔室,壳体上设置有与腔室连通的快插接头,快插接头通过气管连接气源；相比于传统的压制方式而言,本发明在上冲头内设置腔室,使上冲头与下模型腔内的粉末柔性接触,便于粉末在型腔内固形,避免了上冲头直接顶死下模,造成下模停止转动,粉末不能成型的问题。(The invention discloses a flexible upper punch device, which comprises a shell and a base plate arranged at the upper end of the shell, wherein an upper punch is arranged in the shell, a piston is arranged in the shell, the upper punch is embedded in the piston, a cover plate is arranged at the bottom of the shell, and a punch cover is arranged at the lower end of the piston; the piston and the backing plate are arranged at a certain distance; a cavity is formed among the piston, the shell and the base plate, the shell is provided with a quick-connection plug communicated with the cavity, and the quick-connection plug is connected with an air source through an air pipe; compared with the traditional pressing mode, the powder forming device has the advantages that the cavity is arranged in the upper punch, so that the upper punch is in flexible contact with powder in the lower die cavity, the powder is conveniently solidified in the die cavity, and the problems that the upper punch directly pushes the lower die to cause the lower die to stop rotating and the powder cannot be formed are solved.)

1. The upper punch device with flexibility comprises a shell (1) and a base plate (2) arranged at the upper end of the shell, wherein an upper punch (4) is arranged in the shell, and the upper punch device is characterized in that a piston (3) is arranged in the shell, the upper punch (4) is embedded in the piston (3), a cover plate (5) is arranged at the bottom of the shell, and a punch cover (6) is arranged at the lower end of the piston;

the piston and the backing plate are arranged at a certain distance; a cavity (7) is formed among the piston (3), the shell (1) and the backing plate (2), a quick-connection plug (8) communicated with the cavity is arranged on the shell, and the quick-connection plug is connected with an air source through an air pipe.

2. The upper punch device with flexibility according to claim 1, wherein the pressure inside the chamber (7) is 0.5Mpa to 0.7 Mpa.

3. A flexible upper punch device according to claim 1, characterised in that the housing top end is provided with a first sealing ring (11).

4. The upper punch device with flexibility according to claim 1, wherein the piston side is provided with a second seal ring (12) and a third seal ring (13) in this order from top to bottom.

5. A device with a flexible upper punch according to claim 1, characterised in that an anti-rotation pin (9) is arranged through the piston.

6. The upper punch device with flexibility according to claim 1, wherein the shim plate bottom is provided with a boss (10) matching the inner diameter of the housing.

7. The flexible upper punch device according to claim 1, wherein the upper punch is spaced apart from the piston.

8. The upper punch device having flexibility according to claim 7, wherein the distance between the upper punch and the piston is 0.03mm to 0.07 mm.

9. The upper punch device with flexibility according to claim 1, wherein a solenoid valve and a pressure gauge are provided on the air pipe.

10. The upper punch device with flexibility according to claim 1, wherein a pressure regulating valve is provided on the air pipe.

Technical Field

The invention relates to the technical field of stamping, in particular to a flexible upper punch device for a conical cavity of a lower die.

Background

Powder compression molding is a common molding mode, has the advantages of high efficiency, energy conservation and the like, and is widely applied to production and life. The specific steps of powder compaction currently are: the oil press is connected with the upper punch through the matcher, and the upper punch is rigidly connected with the oil press through the matcher so as to ensure stable pressure supply; the lower die is internally provided with a conical cavity matched with the upper punch, after powder is poured into the conical cavity, the lower die rotates to ensure that the powder is uniformly distributed on the inner wall of the conical cavity, and the upper punch presses the lower die to press and form the powder. The defects of the mode are as follows: the matching device is rigidly connected with the upper punch, the gap between the matching device and the upper punch is small, once the upper punch is contacted with powder, the pressure begins to increase rapidly, so that the friction force between the punch and the powder as well as between the powder and the lower die is increased, a mechanism for providing the rotation of the lower die is blocked, the process of filling a cavity with the powder is influenced, and the molding quality and the production efficiency are influenced; and secondly, the adapter is rigidly connected with the upper punch, and the upper punch cannot float left and right, so that the upper punch and the lower die are required to be completely centered, and if the upper punch and the lower die have slight deviation, the upper punch can press the side wall of the conical cavity when being pressed downwards, so that the die abrasion and the uneven thickness of the formed powder are caused, and the forming quality is influenced.

Disclosure of Invention

Aiming at the technical problems of low production efficiency and poor forming quality in the traditional powder pressing process, the invention provides the upper punch device with flexibility, so that the upper punch has certain flexibility in the powder forming process, can adapt to the change of height difference in the powder forming process, and ensures the solid forming of the powder in the conical cavity of the lower die.

The technical scheme adopted by the invention is as follows: the flexible upper punch device comprises a shell and a base plate arranged at the upper end of the shell, wherein an upper punch and a piston are arranged in the shell, the upper punch is embedded in the piston, a cover plate is arranged at the bottom of the shell, and a punch cover is arranged at the lower end of the piston; the piston and the backing plate are arranged at a certain distance; a cavity is formed among the piston, the shell and the base plate, a quick-connection plug communicated with the cavity is arranged on the shell, and the quick-connection plug is connected with an air source through an air pipe. The invention cancels the use of a matcher, directly connects the backing plate of the upper punch device with the oil press, and introduces high-pressure air into the cavity through an air source; the chamber is similar to an air bag, can generate a certain amount of deformation when being squeezed and has certain flexibility. When the upper punch presses the conical cavity of the lower die, the lower die is in a rotating state, the end part of the upper punch is firstly contacted with powder in the cavity, and the cavity is arranged in the upper punch, so that the volume of the cavity is slightly changed, the upper punch is flexibly contacted with the powder in the cavity of the lower die, certain distance is reserved between the upper punch and the powder in the cavity within the range of pressure intensity of the cavity, the powder is convenient to be solidified in the cavity, the problem that the upper punch directly pushes the lower die to cause the stop rotation of the lower die, and the powder cannot be formed is solved. At the moment, the powder is solidified, but the powder tightness is poor, the oil press continues to push the upper punch downwards, the lower die stops rotating, when the acting force of the upper punch is larger than the critical value of the pressure intensity in the cavity, the upper punch presses the solidified powder in the conical cavity, and the solidified powder is pressed and formed in the conical cavity. Compared with the traditional pressing mode, the powder forming device has the advantages that the cavity is arranged in the upper punch, so that the upper punch is in flexible contact with powder in the lower die cavity, the powder is conveniently solidified in the die cavity, and the problems that the upper punch directly pushes the lower die to cause the lower die to stop rotating and the powder cannot be formed are solved.

Furthermore, the pressure in the cavity is 0.5 MPa-0.7 MPa. Pressures in this range of values may be suitable for most metal powder compaction. If the pressure intensity is too large, the chamber does not have corresponding buffer function; if the pressure is too low, the powder is not easily pressed, so the pressure in the chamber of the present invention is preferably 0.5Mpa to 0.7 Mpa.

Further, the top end of the shell is provided with a first sealing ring, so that gas in the cavity is prevented from escaping from the top of the shell, and the sealing performance of the cavity is guaranteed.

Furthermore, a second sealing ring and a third sealing ring are sequentially arranged on the side surface of the piston from top to bottom, so that gas in the cavity is prevented from escaping from the top of the shell, and the sealing property of the cavity is ensured; in addition, two sealing rings play the effect of duplicate protection, have further guaranteed the leakproofness of cavity.

Furthermore, an anti-rotation pin is arranged on the piston in a penetrating way. If the anti-rotation pin is not arranged, because the lower die continuously rotates in the pressing process, when the upper punch contacts with the powder in the tapered cavity of the lower die, the upper punch may synchronously rotate along with the lower die, so that the die is abraded, the powder in the tapered cavity is also unevenly distributed, and the subsequent forming quality is affected. Therefore, the anti-rotation pin is arranged to prevent the upper punch from rotating, so that the technical problem is solved.

Further, the bottom of the backing plate is provided with a boss matched with the inner diameter of the shell. When the shell is installed, the shell can be positioned, and the shell can be installed quickly and accurately.

Further, the upper punch is spaced from the piston by a distance. When the upper punch and the lower die are not coaxial, the upper punch can slightly float and adjust in the piston, alignment is automatically completed, and damage to the die caused by non-coaxial of the upper punch and the die is avoided.

Further, the distance between the upper punch and the piston is 0.03-0.07 mm; the distance is set to be too small, and the upper punch cannot play a role in corresponding floating and adjusting; too large a distance will affect the quality of the powder press-forming.

Furthermore, an electromagnetic valve and a pressure gauge are arranged on the air pipe. The electromagnetic valve controls the inflation and the exhaust of the chamber, the pressure gauge can monitor the pressure in the chamber in real time, and the electromagnetic valve is controlled according to whether the pressure value exceeds a set value or not.

Further, be provided with the air-vent valve on the trachea, the size of the pressure in the adjustable cavity is adjusted, and different pressures are adjusted to the suppression of different powders, make this device can satisfy the suppression of different kinds of powder and use under the different work condition, have improved the commonality of equipment.

The invention has the beneficial effects that:

1. according to the invention, the cavity is arranged in the upper punch, so that the upper punch is in flexible contact with the powder in the lower die cavity, the powder is conveniently solidified in the die cavity, and the problems that the upper punch directly pushes the lower die to cause the lower die to stop rotating and the powder cannot be molded are solved.

2. The upper punch head and the piston are spaced at a certain distance, and when the upper punch head and the lower die are not coaxial, the upper punch head can slightly float and adjust in the piston, so that alignment is automatically completed, and damage to the die caused by non-coaxial of the upper punch head and the lower die is avoided.

3. The electromagnetic valve, the pressure meter and the pressure regulating valve can read and regulate pressure data, and can be regulated according to the solid pressure requirements of different products, so that the powder solid process is more controllable, the powder is more uniformly distributed in the cavity, and the product quality is better.

4. The anti-rotation pin can prevent the upper punch from rotating synchronously with the lower die, avoid the conditions of die abrasion and uneven powder distribution in the conical cavity and ensure the molding quality of powder.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a sectional view of B-B in fig. 1.

Labeled as:

1. a housing; 2. a base plate; 3. a piston; 4. an upper punch; 5. a cover plate; 6. a punch cover; 7. a chamber; 8. a quick connector; 9. an anti-rotation pin; 10. a boss; 11. a first seal ring; 12. a second seal ring; 13. and a third sealing ring.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Example one

Referring to fig. 1 and 2, the upper punch device with flexibility of the present invention comprises a housing 1 and a backing plate 2 arranged at the upper end of the housing, wherein an upper punch 4 is arranged in the housing, a piston 3 is arranged in the housing, the upper punch 4 is embedded in the piston 3, a cover plate 5 is arranged at the bottom of the housing, and a punch cover 6 is arranged at the lower end of the piston; the piston and the backing plate are arranged at a certain distance; a cavity 7 is formed among the piston 3, the shell 1 and the backing plate 2, a quick connector 8 communicated with the cavity is arranged on the shell, and the quick connector is connected with an air source (not shown in the figure) through an air pipe (not shown in the figure). The gas source may be a compressor. The invention cancels the use of a matcher, directly connects the backing plate of the upper punch device with the oil press, and introduces high-pressure air into the cavity through an air source; the chamber is similar to an air bag, can generate a certain amount of deformation when being squeezed and has certain flexibility. When the upper punch presses the conical cavity of the lower die, the lower die is in a rotating state, the end part of the upper punch is firstly contacted with powder in the cavity, and the cavity is arranged in the upper punch, so that the volume of the cavity is slightly changed, the upper punch is flexibly contacted with the powder in the cavity of the lower die, certain distance is reserved between the upper punch and the powder in the cavity within the range of pressure intensity of the cavity, the powder is convenient to be solidified in the cavity, the problem that the upper punch directly pushes the lower die to cause the stop rotation of the lower die, and the powder cannot be formed is solved. At the moment, the powder is solidified, but the powder tightness is poor, the oil press continues to push the upper punch downwards, the lower die stops rotating, when the acting force of the upper punch is larger than the critical value of the pressure intensity in the cavity, the upper punch presses the solidified powder in the conical cavity, and the solidified powder is pressed and formed in the conical cavity. Compared with the traditional pressing mode, the powder forming device has the advantages that the cavity is arranged in the upper punch, so that the upper punch is in flexible contact with powder in the lower die cavity, the powder is conveniently solidified in the die cavity, and the problems that the upper punch directly pushes the lower die to cause the lower die to stop rotating and the powder cannot be formed are solved.

The pressure in the chamber 7 of this embodiment is 0.5Mpa to 0.7 Mpa. Pressures in this range of values may be suitable for most metal powder compaction. If the pressure intensity is too large, the chamber does not have corresponding buffer function; if the pressure is too low, the powder is not easily pressed, so the pressure in the chamber of the present invention is preferably 0.5Mpa to 0.7 Mpa.

Referring to fig. 2, in the present embodiment, a first sealing ring 11 is disposed at the top end of the housing to prevent the gas in the chamber from escaping from the top of the housing, thereby ensuring the sealing performance of the chamber.

Referring to fig. 2, in the embodiment, a second sealing ring 12 and a third sealing ring 13 are sequentially arranged on the side surface of the piston from top to bottom, so that gas in the chamber is prevented from escaping from the top of the shell, and the sealing property of the chamber is ensured; in addition, two sealing rings play the effect of duplicate protection, have further guaranteed the leakproofness of cavity.

Referring to fig. 1 and 2, an anti-rotation pin 9 is disposed through the piston in this embodiment. If the anti-rotation pin is not arranged, because the lower die continuously rotates in the pressing process, when the upper punch contacts with the powder in the tapered cavity of the lower die, the upper punch may synchronously rotate along with the lower die, so that the die is abraded, the powder in the tapered cavity is also unevenly distributed, and the subsequent forming quality is affected. Therefore, the anti-rotation pin is arranged to prevent the upper punch from rotating, so that the technical problem is solved.

Referring to fig. 2, the present embodiment is provided with a boss 10 matching the inner diameter of the case at the bottom of the backing plate. When the shell is installed, the shell can be positioned, and the shell can be installed quickly and accurately.

Example two

In the first embodiment, the distance between the upper punch and the piston is 0.03mm to 0.07 mm. The upper punch head and the piston are spaced by a certain distance. When the upper punch and the lower die are not coaxial, the upper punch can slightly float and adjust in the piston, alignment is automatically completed, and damage to the die caused by non-coaxial of the upper punch and the die is avoided. In addition, the distance is set to be too small, and the upper punch cannot play a role in corresponding floating and adjusting; too large a distance will affect the quality of the powder press-forming.

EXAMPLE III

In addition to the first embodiment, the air pipe of the present embodiment is provided with an electromagnetic valve (not shown), a pressure gauge (not shown), and a pressure regulating valve (not shown). The electromagnetic valve controls the inflation and the exhaust of the chamber, the pressure gauge can monitor the pressure in the chamber in real time, and the electromagnetic valve is controlled according to whether the pressure value exceeds a set value or not; the size of the pressure in the adjustable cavity of air-vent valve, to the different pressure of the suppression regulation of different powders, make this device can satisfy the suppression of different kinds of powder and use under the different work condition. The working principle is as follows: taking the mixture of copper powder and tungsten powder as an example of the powder, connecting a base plate of an upper punch device with an oil press, and introducing high-pressure air into a cavity through an air source; according to the characteristics of the powder, the pressure in the cavity is adjusted to be 0.6Mpa through the pressure regulating valve. Adding powder into the conical cavity of the lower die, rotating the lower die, pressing the upper punch towards the conical cavity of the lower die, enabling the end part of the upper punch to be firstly contacted with the powder, continuously pushing the upper punch downwards by an oil press, applying an acting force to the cavity by the upper punch in a reverse direction at the moment, and reducing the volume of the cavity; during the period, the oil press continues to press down, but the position of the upper punch is unchanged, when the acting force of the upper punch reaches the critical value of the pressure in the cavity, the upper punch presses the conical cavity again, and the powder is pressed and formed in the conical cavity.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.