Valve mechanism for pressurizing negative pressure cavity of cold extrusion punch

Abstract

The utility model discloses cold extrusion male die negative pressure cavity pressure increasing valve mechanism belongs to mould processing technical field. Cold extrusion male die negative pressure cavity pressure increasing valve mechanism, including valve body, the one end of valve body is provided with valve bush, and the other end of valve body is provided with the plug, wherein, the plug is connected with the valve body telescopic, the inside of valve body is provided with valve cavity, and the inside of valve cavity is provided with compression spring. To solve the problem that needs to repeatedly spin the operation in the product forming process, can product inner wall and spinning core core adhere, because wall body is thicker than wall bottom, more repeatedly spins to make wall body thickness reach the problem of requirement, through the high pressure medium of injection in single extrusion stroke, instantaneously produces strong negative pressure adsorption force and even radial pressure, one-time or a few times spin pressure can realize the close adhesion of wall body and core core, and the material is driven to the wall part flow thickening with strong force, eliminates the demand of repeatedly spinning.

Description

Technical Field

[0001] This utility model relates to the field of mold processing technology, specifically to a pressure boosting valve mechanism for the negative pressure cavity of a cold extrusion punch. Background Technology

[0002] The product molding process requires repeated spinning operations to ensure that the inner wall of the product fits the spinning core. Since the wall is thicker than the bottom, repeated spinning is even more necessary to achieve the required wall thickness. Although spinning products have high quality and precision, the production efficiency is too low, making it only suitable for small-batch production. Utility Model Content

[0003] The purpose of this invention is to provide a pressure boosting valve mechanism for the negative pressure cavity of a cold extrusion punch. By injecting a high-pressure medium during a single extrusion stroke, a strong negative pressure adsorption force and uniform radial pressure are instantly generated. The wall and core can be tightly bonded in one or very few spins, and the material is strongly driven to flow and thicken towards the wall, eliminating the need for repeated spins and solving the problems in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a pressure boosting valve mechanism for a negative pressure cavity of a cold extrusion punch, comprising a valve body, a valve sleeve at one end of the valve body, and a plug at the other end of the valve body, wherein the plug is telescopically connected to the valve body, a valve cavity is provided inside the valve body, a compression spring is provided inside the valve cavity, a fixed bushing is provided at one end of the compression spring, a movable bushing is provided at the other end of the compression spring, and a pressure relief hole is provided at the bottom of the valve cavity.

[0005] Preferably, a valve stem is provided inside the valve sleeve, and the valve stem extends into the valve cavity, wherein the valve stem is telescopically connected to the valve sleeve.

[0006] Preferably, a sealing gasket is provided on the inner side of the valve sleeve, the sealing gasket is in contact with the valve stem, and the compression spring is connected to the valve stem through a retaining bushing.

[0007] Preferably, the internal valve core of the plug is connected to the movable bushing by bolts, and the surface of the middle section of the valve core is provided with a blocking groove.

[0008] Preferably, the valve core is telescopically connected to the plug, and both ends of the valve core are provided with limit structures.

[0009] Preferably, the outer surface of the plug is provided with a pressure-boosting hole.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. This utility model uses a high-pressure medium injected during a single extrusion stroke to instantly generate a strong negative pressure adsorption force and uniform radial pressure. The wall and core can be tightly bonded in one or very few spin-pressing operations, and the material is strongly driven to flow and thicken towards the wall. This eliminates the need for repeated spin-pressing, greatly shortens the molding cycle of a single product, and significantly improves production efficiency.

[0012] 2. In this invention, the high-pressure medium forms a uniformly distributed pressure field throughout the cavity. This uniform pressure acts on the inner surface of the material, which can more effectively and evenly push the material to the mold surface and promote its flow towards the wall. Compared with the local high pressure and uneven material flow caused by the point contact and line contact of traditional spinning rollers, this mechanism effectively avoids the problems of local thinness, uneven thickness, or wrinkles in the wall. Attached Figure Description

[0013] Figure 1 This is the overall front view of the present invention;

[0014] Figure 2 This is a schematic cross-sectional view of the present invention.

[0015] In the diagram: 1. Valve body; 2. Valve sleeve; 3. Plug; 101. Compression spring; 102. Pressure relief hole; 103. Valve cavity; 1011. Fixed bushing; 1012. Moving bushing; 201. Valve stem; 202. Sealing gasket; 301. Blocking groove; 302. Pressure boosting hole; 303. Valve core. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] To address the issue of requiring repeated spinning operations during product molding to achieve a proper fit between the inner wall and the spun core, and the fact that the wall thickness is even greater than the base, necessitating repeated spinning to achieve the required wall thickness; please refer to... Figure 1-2 The present invention provides the following solution:

[0018] refer to Figure 1-2The pressure boosting valve mechanism for the negative pressure cavity of the cold extrusion punch includes a valve body 1, a valve sleeve 2 at one end of the valve body 1, and a plug 3 at the other end of the valve body 1. The plug 3 is telescopically connected to the valve body 1. A valve cavity 103 is provided inside the valve body 1. A compression spring 101 is provided inside the valve cavity 103. A fixed bushing 1011 is provided at one end of the compression spring 101, and a movable bushing 1012 is provided at the other end of the compression spring 101. A pressure relief hole 102 is provided at the bottom of the valve cavity 103.

[0019] In this embodiment, when the cold extrusion punch begins to move downward to apply pressure to the blank, the movement of the punch will push the valve stem 201. The valve stem 201 moves inward within the valve sleeve 2. The inward movement of the valve stem 201 directly compresses the compression spring 101 in the valve cavity 103 through the fixed bushing 1011. The compression spring 101 is compressed, and its other end transmits the force to the valve core 303, which is rigidly connected by bolts, through the movable bushing 1012. The valve core 303 is pushed inward within the plug 3. When the valve core 303 moves inward, its main body will completely cover and seal the pressure relief hole 102 at the bottom of the valve cavity 103, cutting off the pressure relief channel between the cavity and the outside atmosphere.

[0020] As the valve core 303 moves inward, the blocking groove 301 on its surface moves to a position aligned with the pressure boosting hole 302 on the outer surface of the plug 3. At this time, the high-pressure medium source can be injected into the cavity inside the extrusion punch through the open pressure boosting hole 302 and the blocking groove 301 on the valve core 303 without obstruction, and a negative pressure environment much higher than atmospheric pressure is instantly established in the cavity.

[0021] refer to Figure 2 The valve sleeve 2 is provided with a valve stem 201 inside, which extends into the valve cavity 103. The valve stem 201 is telescopically connected to the valve sleeve 2. A sealing gasket 202 is provided on the inner side of the valve sleeve 2, which fits against the valve stem 201. A compression spring 101 is connected to the valve stem 201 through a fixed bushing 1011. The plug 3 is provided with a valve core 303 inside, which is connected to the movable bushing 1012 by bolts. A blocking groove 301 is provided on the surface of the middle section of the valve core 303. The valve core 303 is telescopically connected to the plug 3, and both ends of the valve core 303 are provided with limit structures. A pressure-boosting hole 302 is provided on the outer surface of the plug 3.

[0022] In this embodiment, when the cold extrusion punch completes its extrusion stroke and begins its upward return stroke, the thrust applied to the valve stem 201 disappears. At this time, the compressed spring 101 begins to release its stored elastic potential energy. The restoring force of the spring 101 pushes the valve core 303 through the movable bushing 1012, and simultaneously pulls the valve stem 201 through the fixed bushing 1011, causing both to move outward and reset synchronously. As the valve core 303 resets outward, the blocking groove 301 on it gradually deviates from its alignment with the pressure-boosting hole 302 on the plug 3. The solid part of the valve core 303 finally cuts off the passage from the high-pressure medium source to the cavity. At the same time, as the valve core 303 moves outward, its main body leaves the pressure relief hole 102 area at the bottom of the valve cavity 103, making the pressure relief hole 102 fully exposed and unobstructed. The high-pressure medium in the cavity is quickly discharged to the atmosphere or low-pressure circuit through the unobstructed pressure relief hole 102. The pressure inside the cavity rapidly drops to atmospheric pressure.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cold extrusion male die negative pressure cavity pressurization valve mechanism, characterized by, The valve includes a valve body (1), one end of which is provided with a valve sleeve (2) and the other end of which is provided with a plug (3). The plug (3) is telescopically connected to the valve body (1). The valve body (1) is provided with a valve cavity (103) inside. The valve cavity (103) is provided with a compression spring (101) inside. One end of the compression spring (101) is provided with a fixed bushing (1011) and the other end of the compression spring (101) is provided with a movable bushing (1012). The bottom of the valve cavity (103) is provided with a pressure relief hole (102).

2. The cold extrusion male die negative pressure cavity pressurization valve mechanism according to claim 1, characterized in that: The valve sleeve (2) is provided with a valve stem (201) inside, which extends into the valve cavity (103). The valve stem (201) is telescopically connected to the valve sleeve (2).

3. A cold extrusion male die negative pressure cavity pressurisation valve mechanism according to claim 2, wherein: A sealing washer (202) is provided on the inner side of the valve sleeve (2), and the sealing washer (202) is in contact with the valve stem (201). The compression spring (101) is connected to the valve stem (201) through a retaining bushing (1011).

4. The cold extrusion male die negative pressure cavity pressurization valve mechanism according to claim 1, characterized in that: The valve core (303) inside the plug (3) is connected to the movable bushing (1012) by bolts, and the surface of the middle section of the valve core (303) is provided with a blocking groove (301).

5. A cold extrusion male die negative pressure cavity pressurisation valve mechanism according to claim 4, wherein: The valve core (303) is telescopically connected to the plug (3), and both ends of the valve core (303) are provided with limit structures.

6. The cold extrusion male die negative pressure cavity pressurization valve mechanism according to claim 1, characterized in that: The outer surface of the plug (3) is provided with a pressure-boosting hole (302).

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