Replaceable negative pressure booster valve for cold extrusion die

Abstract

The utility model discloses a replaceable negative pressure pressure increasing valve for cold extrusion die belongs to die processing technical field. Replaceable negative pressure pressure increasing valve for cold extrusion die, including valve body, lock sleeve and end, wherein, the end is connected through the lock sleeve between valve body, the outer surface of end is provided with outer pressure hole, the inside of valve body is provided with outer push valve rod, and one end of outer push valve rod extends to the outside of valve body. To solve the problem that the cold extrusion technology is in the rigidity material withdrawal demolding, the product wall body strength is insufficient to resist the outside air pressure in the demolding process, forces the thin -walled product wall body to contract to the negative pressure cavity, produces the waist deformation, and a large number of waste products appear, through the mechanism of stage, on -demand pressure relief, initiatively, the release process of negative pressure in cavity is controlled accurately.

Description

Technical Field

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

[0002] When cold extrusion technology is used to produce products with thick bottoms and thin walls, the product adheres to the forming punch after molding. During the hard ejection and demolding process, a negative pressure cavity is formed between the inner wall of the product and the punch. The product has a high temperature and a thin wall. During the demolding process, the strength of the product wall is insufficient to resist the external air pressure, which forces the thin-walled product wall to shrink into the negative pressure cavity, resulting in waist-shrinking deformation and a large number of defective products. Utility Model Content

[0003] The purpose of this utility model is to provide a replaceable negative pressure boosting valve for cold extrusion dies. Without disassembling the entire die or performing complex on-site repairs, the entire replaceable negative pressure boosting valve module can be quickly removed by simply loosening the locking sleeve and replaced with a spare valve or a repaired valve body. This reduces equipment downtime, improves the reliability and availability of the die system, and solves the problems in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a replaceable negative pressure boosting valve for cold extrusion dies, comprising a valve body, a locking sleeve, and an end head, wherein the end head is connected to the valve body via the locking sleeve, the outer surface of the end head is provided with an external pressure hole, the valve body is provided with an external push valve rod inside, one end of the external push valve rod extends to the outside of the valve body, wherein a sealing bushing is provided between the external push valve rod and the valve body, the external push valve rod and the sealing bushing are telescopically connected, and a compression spring is provided on the outside of the external push valve rod.

[0005] Preferably, one end of the compression spring is fitted with a sealing bushing, and the other end of the compression spring is provided with a valve sleeve, wherein the valve sleeve extends into the interior of the end.

[0006] Preferably, the valve sleeve is provided with an inner push valve rod, one end of which is connected to the outer push valve rod through a slot.

[0007] Preferably, a displacement spring is provided on the outer side of the inner push valve stem, and the inner push valve stem is telescopically connected to the valve sleeve through the displacement spring.

[0008] Preferably, the bottom surface of the valve sleeve is provided with an inner pressure hole, which corresponds to the outer pressure hole.

[0009] Preferably, the valve plug at the other end of the push valve stem fits into the end head, and the end head is telescopically connected to the locking sleeve.

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

[0011] 1. This utility model actively and precisely controls the release process of negative pressure in the cavity through a phased and on-demand pressure relief mechanism. In the first stage, part of the atmospheric pressure is introduced to significantly reduce the initial pressure difference peak. In the second stage, the internal and external pressures are quickly and thoroughly balanced. This dynamic pressure management completely eliminates the negative pressure difference that causes the wall of thin-walled products to shrink inward, thereby eliminating the root cause of defective products due to waist shrinkage and significantly improving the product qualification rate and dimensional accuracy.

[0012] 2. In this utility model, the entire pressure boosting valve is designed as an independent module and fixed by a locking sleeve. When the internal seals of the valve body are worn, the spring fails, or the valve stem is damaged, there is no need to disassemble the entire mold or perform complex on-site repairs. Simply loosen the locking sleeve to quickly remove the entire replaceable negative pressure boosting valve module and replace it with a spare valve or a repaired valve body, thereby shortening equipment downtime and improving the reliability and availability of the mold system. Attached Figure Description

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

[0014] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0015] In the diagram: 1. Valve body; 2. Locking sleeve; 3. End; 101. External push valve stem; 102. Internal push valve stem; 103. Compression spring; 104. Valve sleeve; 1011. Sealing bushing; 1041. Displacement spring; 1042. Internal pressure hole; 1043. Valve plug; 301. External pressure hole. 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 in cold extrusion technology where, during rigid ejection and demolding, the product wall strength is insufficient to withstand external air pressure, forcing thin-walled products to shrink into the negative pressure cavity, resulting in waist-shrinkage deformation and a large number of defective products; please refer to... Figure 1-2 The present invention provides the following solution:

[0018] refer to Figure 1-2A replaceable negative pressure boosting valve for cold extrusion dies includes a valve body 1, a locking sleeve 2, and an end head 3. The end head 3 is connected to the valve body 1 via the locking sleeve 2. An external pressure hole 301 is provided on the outer surface of the end head 3. An external push valve rod 101 is provided inside the valve body 1. One end of the external push valve rod 101 extends to the outside of the valve body 1. A sealing bushing 1011 is provided between the external push valve rod 101 and the valve body 1. The external push valve rod 101 and the sealing bushing 1011 are telescopically connected. A compression spring 103 is provided on the outside of the external push valve rod 101. One end of the compression spring 103 is in contact with the sealing bushing 1011. The other end of the compression spring 103 is provided with a valve sleeve 104, which extends into the interior of the end head 3.

[0019] In this embodiment, during the cold extrusion molding process when the mold is closed and during the initial stage of the demolding action, the end of the external push valve rod 101 is tightly fitted with the inner cavity or a specific sealing surface of the end head 3 under the action of the compression spring 103, forming the first main seal. At the same time, under the action of the displacement spring 1041, the valve plug 1043 at the end of the internal push valve rod 102 is pushed towards and tightly pressed against the outlet end of the end head 3, forming the second key seal. The two seals work together to completely isolate the mold cavity from the external atmospheric environment. At this time, both the internal pressure hole 1042 and the external pressure hole 301 are blocked and closed by the corresponding valve rod and valve plug.

[0020] As the demolding mechanism begins to operate, the product gradually detaches from the mold core. When the product moves a certain distance, a small gap appears between its wall and the inner wall of the cavity, but they remain tightly fitted. At this point, the product begins to experience a significant pressure difference between the external atmospheric pressure and the negative pressure within the cavity. The demolding force applied to the product overcomes the preload of the compression spring 103, pushing the push valve rod 101 a short distance into the valve body 1. This movement causes the end of the push valve rod 101 to move away from the first sealing surface with the end cap 3, opening the first channel. At this time, the external pressure hole 301 connects with the space outside the valve sleeve 104. External air begins to enter the annular space between the valve sleeve 104 and the end cap 3 through the external pressure hole 301, and then enters the small gap area formed by the initial separation of the cavity and the product wall. This partially offsets the negative pressure inside the cavity, significantly reducing the initial pressure difference peak acting on the product wall. The product wall now only needs to resist a greatly weakened pressure difference, and its strength is sufficient to maintain its shape and prevent initial shrinkage.

[0021] refer to Figure 2The valve sleeve 104 is provided with an inner push valve rod 102. One end of the inner push valve rod 102 is connected to the outer push valve rod 101 through a slot. A displacement spring 1041 is provided on the outside of the inner push valve rod 102. The inner push valve rod 102 is telescopically connected to the valve sleeve 104 through the displacement spring 1041. An inner pressure hole 1042 is provided on the bottom surface of the valve sleeve 104. The inner pressure hole 1042 corresponds to the outer pressure hole 301. The valve plug 1043 at the other end of the inner push valve rod 102 fits against the end 3. The end 3 is telescopically connected to the locking sleeve 2.

[0022] In this embodiment, as the product continues to move outward under the action of the demolding force, the gap between the product wall and the inner wall of the cavity further increases, and the sealing effect on the negative pressure in the cavity weakens sharply. At this time, due to the movement of the outward push valve rod 101, the inward push valve rod 102 will overcome the small preload of the displacement spring 1041 and move together into the valve body 1. The movement of the inward push valve rod 102 will pull the valve plug 1043 at its end away from the second sealing surface of the end 3. The separation of the valve plug 1043 opens a second, more direct channel: the inner pressure hole 1042 is directly connected to the cavity through the central channel of the end 3. External air quickly and in large quantities flows directly into the cavity through the inner pressure hole 1042. The negative pressure environment in the cavity is instantly and completely balanced to atmospheric pressure. At this time, the pressure inside and outside the product wall is completely equal, and the fundamental driving force that causes waist deformation is completely eliminated. During the subsequent complete demolding process, the product wall is no longer subjected to pressure that causes it to shrink inward, thereby maintaining its precise extrusion shape.

[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 replaceable negative pressure boosting valve for cold extrusion dies, characterized in that, The device includes a valve body (1), a locking sleeve (2), and an end (3). The end (3) is connected to the valve body (1) via the locking sleeve (2). An external pressure hole (301) is provided on the outer surface of the end (3). An external push valve rod (101) is provided inside the valve body (1). One end of the external push valve rod (101) extends to the outside of the valve body (1). A sealing bushing (1011) is provided between the external push valve rod (101) and the valve body (1). The external push valve rod (101) and the sealing bushing (1011) are telescopically connected. A compression spring (103) is provided on the outside of the external push valve rod (101).

2. The replaceable negative pressure boosting valve for cold extrusion dies according to claim 1, characterized in that: One end of the compression spring (103) is fitted with the sealing bushing (1011), and the other end of the compression spring (103) is provided with a valve sleeve (104), wherein the valve sleeve (104) extends into the interior of the end (3).

3. The replaceable negative pressure boosting valve for cold extrusion dies according to claim 2, characterized in that: The valve sleeve (104) is provided with an inner push valve rod (102), one end of which is connected to the outer push valve rod (101) through a slot.

4. The replaceable negative pressure boosting valve for cold extrusion dies according to claim 3, characterized in that: A displacement spring (1041) is provided on the outer side of the inner push valve stem (102), and the inner push valve stem (102) is telescopically connected to the valve sleeve (104) through the displacement spring (1041).

5. The replaceable negative pressure boosting valve for cold extrusion dies according to claim 3, characterized in that: The bottom surface of the valve sleeve (104) is provided with an inner pressure hole (1042), which corresponds to the outer pressure hole (301).

6. The replaceable negative pressure boosting valve for cold extrusion dies according to claim 3, characterized in that: The valve plug (1043) at the other end of the inner push valve stem (102) fits against the end (3), and the end (3) is telescopically connected to the locking sleeve (2).

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