Demolding device for cold extrusion mold core

Abstract

The utility model relates to the technical field of aluminum hose manufacturing, and discloses a cold extrusion mold core demolding device which comprises a female mold, and a novel valve core is installed in the female mold in a matched mode. The novel valve element is composed of a rod core and a head which are integrally formed. Wherein the head part is in a circular truncated cone shape, and a small-radius circular plane of the head part is coaxially and fixedly connected with the rod core; the side curved surface of the head part protrudes outwards to form a circle of thickening body, the thickening body and the head part are integrally formed, and the side curved surface of the thickening body is conical; the end face, close to the rod core, of the thickening body is an annular plane, and a force unloading platform matched with the annular plane and abutting against the annular plane in a matched mode is arranged in the female die. The end, away from the rod core, of the thickened body is a circle, and the circle and the circle where the edge of the large-radius circular plane of the head are located share the same circle center and are the same in radius. The thickness of the edge part of the novel valve core is increased, the strength is improved, and the novel valve core is not easy to wear and crack; meanwhile, the large-radius circular plane of the head of the novel valve element is flush with the groove bottom of the die groove, and the flatness of the tank bottom is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of aluminum hose manufacturing technology, and in particular to a cold extrusion die core demolding device. Background Technology

[0002] Currently, aluminum cans are mainly formed using extrusion. During the extrusion process, the die release relies primarily on the displacement of the valve core at the bottom of the die and the simultaneous injection of high-pressure gas to push the formed aluminum can out. The main valve core head body currently... Figure 1 The figure is roughly shaped like a frustum, with very thin edges at the point where the frustum contacts the tank.

[0003] Based on the above technical features, the problem is that the edges of the existing old-style valve core head body are very easy to wear or crack after a certain number of uses, resulting in gaps when the valve core and the bottom of the die are fitted together, and uneven scars appear on the bottom of the can after extrusion, affecting product quality.

[0004] Therefore, it is necessary to solve the above problems by using a cold extrusion die core demolding device. Utility Model Content

[0005] The purpose of this invention is to provide a cold extrusion die core demolding device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cold extrusion die core demolding device, comprising a die cavity, in which a novel valve core is fitted; the novel valve core consists of a rod core and a head, which are integrally formed; wherein the head is frustum-shaped, and the small-radius circular plane of the head is coaxially and fixedly connected to the rod core; a thickened body protrudes outward from the side curved surface of the head, the thickened body is integrally formed with the head, and the side curved surface of the thickened body is conical; the end face of the thickened body near the rod core is an annular plane, and a stress-relieving platform matching and engaging with the annular plane is provided in the die cavity; the end of the thickened body away from the rod core is a circle, which shares the same center and radius as the circle containing the edge of the large-radius circular plane of the head.

[0007] Preferably, the die is fixed to the cold extrusion equipment, and the novel valve core is fixed to the ejector rod of the cold extrusion equipment by fixing bolts.

[0008] Preferably, the concave mold has a groove that matches the bottom of the aluminum can, and the large-radius circular plane of the novel valve core head is flush with the bottom of the groove and located at the center of the groove bottom; the large-radius circular plane of the novel valve core head abuts against the bottom of the aluminum can.

[0009] The technical effects and advantages of this utility model are as follows: The novel valve core head of this utility model is divided into two parts, and a thickened body is set in the part that contacts the bottom of the tank. This increases the angle between the generatrix of the conical surface and the plane that contacts the bottom of the tank, thereby increasing the thickness of the edge part of the novel valve core, improving its strength, and making it less prone to wear and cracking. At the same time, a stress relief platform is set in the die cavity that corresponds to and matches the annular plane of the thickened body. This can better transfer the extrusion pressure to the die cavity, ensuring that the large-radius circular plane of the novel valve core head is flush with the bottom of the die groove, thus ensuring the flatness of the bottom of the tank. Attached Figure Description

[0010] Figure 1 A schematic diagram of an existing old-style valve core;

[0011] Figure 2 This is a schematic diagram of the novel valve core of this utility model;

[0012] Figure 3 This is a schematic diagram of the valve core assembly of this utility model.

[0013] In the diagram: 1. New type of valve core; 2. Unloading platform; 3. Thickened body; 4. Mold groove; 5. Fixing bolt; 6. Die; 7. Old type of valve core. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0015] This utility model provides, for example Figures 2 to 3 The cold extrusion die core demolding device shown includes a die 6, in which a novel valve core 1 is fitted. The die 6 is fixed to the cold extrusion equipment, and the novel valve core 1 is fixed to the ejector rod of the cold extrusion equipment by fixing bolts 5. The above is prior art and will not be described in detail here.

[0016] The novel valve core 1 consists of a rod and a head, which are integrally formed. The head of the novel valve core 1 is frustum-shaped, and the small-radius circular plane of the head is coaxially and fixedly connected to the rod. A mold groove 4 matching the bottom of the aluminum can is opened on the cavity mold 6, and the large-radius circular plane of the head of the novel valve core 1 abuts against the bottom of the aluminum can.

[0017] New valve core 1 and Figure 1 The difference between the old valve core 7 and the new valve core 1 is that a thickened body 3 protrudes outward from the side curved surface of the head. The thickened body 3 is integrally formed with the head and the side curved surface of the thickened body 3 is conical.

[0018] The end face of the thickened body 3 near the core is a circular plane, and the cavity 6 has a stress relief platform 2 that matches and abuts against the circular plane.

[0019] The end of the thickened body 3 away from the core is a circle, which shares the same center and radius as the circle containing the edge of the large-radius circular plane of the head.

[0020] The large-radius circular plane at the head of the new valve core 1 is flush with the bottom of the mold groove 4 and located at the center of the groove bottom.

[0021] Working principle: During the cold extrusion process, the bottom of the aluminum can is placed into the die groove 4. At this time, the large-radius circular plane of the head of the new valve core 1 and the bottom of the die groove 4 are in contact with the outer wall of the aluminum can bottom. During extrusion, due to the presence of the thickened body 3, the thickness of the edge part where the head of the new valve core 1 contacts the bottom of the aluminum can is increased, the strength is improved, and it is not easy to wear or crack.

[0022] At the same time, the new valve core 1 is subjected to extrusion pressure, which is transmitted to the unloading platform 2 through the thickened body 3. At this time, the extrusion pressure can be better transmitted to the die 6, ensuring that the large radius circular plane of the new valve core 1 is flush with the bottom of the groove of the die 6, thus ensuring the flatness of the tank bottom.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cold extrusion core stripping device, comprising a female die (6) in which a new valve core (1) is fitted; characterized in that: The new valve core (1) is composed of a rod core and a head, which are integrally formed; the head is in the shape of a circular truncated cone, and a small-radius circular plane of the head is coaxially and fixedly connected with the rod core; a thickened body (3) is outwardly protruded on a side curved surface of the head, the thickened body (3) is integrally formed with the head, and a side curved surface of the thickened body (3) is in the shape of a tapered cylinder; an end surface of the thickened body (3) close to the rod core is a circular ring plane, a force relief platform (2) matched with the circular ring plane is formed in the recess die (6) and abuts against the circular ring plane; and an end of the thickened body (3) away from the rod core is a circle, which has the same center as a circle where an edge of a large-radius circular plane of the head is located and has the same radius.

2. A cold extrusion core release device according to claim 1, characterised in that: The recess die (6) is fixed on a cold extrusion device, and the new valve core (1) is fixed on an ejection rod of the cold extrusion device through a fixing bolt (5).

3. A cold extrusion core release device according to claim 1, wherein: A die groove (4) matched with a bottom of an aluminum can is formed on the recess die (6), a large-radius circular plane of the head of the new valve core (1) is flush with a bottom of the die groove (4) and is located at a center position of the bottom, and the large-radius circular plane of the head of the new valve core (1) abuts against the bottom of the aluminum can.

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