Local extrusion pin assembly for aluminum alloy die-casting production

Abstract

The utility model discloses a local extrusion pin assembly for aluminum alloy die-casting production, which comprises an extrusion oil cylinder, an extrusion pin, an extrusion sleeve and a partition leather, a cooling water path is arranged in the extrusion pin, and an inlet and an outlet which are respectively communicated with two ends of the cooling water path are arranged on the wall surface of the extrusion pin; an inner hole of the extrusion sleeve is divided into an upper section and a lower section, the diameter of the upper section of the inner hole of the extrusion sleeve is smaller than that of the lower section, the bottom end of the extrusion pin enters the inner hole of the extrusion sleeve downwards, and a gap is formed between the extrusion pin and the upper section of the inner hole of the extrusion sleeve; the local extrusion pin assembly for aluminum alloy die-casting production further comprises a partition leather, the partition leather is connected to the workpiece to be machined, the partition leather is of an annular sleeve structure, and the height of the partition leather is larger than the stroke of the extrusion oil cylinder. The lower section of the inner hole of the extrusion sleeve is clamped on the periphery of the partition leather, the peripheral surface of the partition leather is in contact fit with the wall surface of the lower section of the inner hole of the extrusion sleeve, the inner hole of the partition leather is used for inserting the extrusion pin, and at the beginning, the depth of the bottom end of the extrusion pin entering the lower section of the inner hole of the extrusion sleeve is equal to the difference between the height of the partition leather and the stroke of the extrusion oil cylinder.

Description

Technical Field

[0001] The utility model relates to a local extrusion pin component produced by aluminum alloy die casting, belonging to the technical field of aluminum alloy die casting production. Background Art

[0002] Among the products currently produced by aluminum alloy die-casting, more and more castings use local extrusion technology, which is to extrude and compensate for shrinkage at the thick wall position of the product through the cooperation of the extrusion cylinder and the extrusion pin, thereby reducing shrinkage defects in the die-casting and improving product quality.

[0003] The local extrusion process is a special process that uses local extrusion pins to extrude the product wall thickness position. The oil cylinder is used to push the extrusion pin to extrude the product. In the local extrusion process of the existing technology, the gap between the extrusion pin and the extrusion sleeve is very small or even no gap, the extrusion pin cannot be cooled, and there is direct contact between the extrusion pin and the extrusion position. These problems will cause the extrusion pin to get stuck during the production process. In the actual production process, if the extrusion pin gets stuck, it will affect the production efficiency and product quality, so a reasonable extrusion pin structure is needed. Utility Model Content

[0004] The utility model aims to provide a local extrusion pin assembly produced by aluminum alloy die casting, so as to solve the technical problem that the extrusion pin is easily stuck in the local extrusion operation in the prior art.

[0005] The utility model adopts the following technical scheme: a local extrusion pin assembly produced by aluminum alloy die casting, which includes an extrusion oil cylinder, an extrusion pin and an extrusion sleeve, the upper end of the extrusion pin is connected to the extrusion oil cylinder, the lower end of the extrusion pin is inserted into the extrusion sleeve, a cooling water channel is arranged inside the extrusion pin, an inlet and an outlet are respectively connected to the two ends of the cooling water channel on the wall surface of the extrusion pin, the lower end of the extrusion pin inserted into the extrusion sleeve is a cylindrical structure with equal upper and lower diameters; the inner hole of the extrusion sleeve is divided into upper and lower sections, the diameter of the upper section of the inner hole of the extrusion sleeve is smaller than the diameter of the lower section, and the bottom end of the extrusion pin enters the extrusion sleeve downward The inner hole of the pressing sleeve, there is a gap between the extrusion pin and the upper section of the inner hole of the extrusion sleeve; the local extrusion pin assembly produced by aluminum alloy die-casting also includes a septum, which is connected to the workpiece to be processed, and the septum adopts an annular sleeve structure, and the height of the septum is greater than the stroke of the extrusion cylinder; the lower section of the inner hole of the extrusion sleeve is clamped on the outer periphery of the septum, and the outer peripheral surface of the septum is in contact with the wall surface of the lower section of the inner hole of the extrusion sleeve, and the inner hole of the septum is for the extrusion pin to be inserted. Initially, the depth of the bottom end of the extrusion pin entering the lower section of the inner hole of the extrusion sleeve is equal to the difference between the height of the septum and the stroke of the extrusion cylinder. After extrusion, the bottom of the extrusion pin enters the bottom of the inner hole of the septum.

[0006] The gap between the extrusion pin and the upper section of the inner hole of the extrusion sleeve is 2 to 3 threads.

[0007] The lower section of the inner hole of the extrusion sleeve is a tapered hole that gradually expands downward; the outer diameter of the diaphragm gradually increases from top to bottom, and the inner diameter of the diaphragm remains unchanged from top to bottom.

[0008] Initially, the depth of the bottom end of the extrusion pin entering the lower section of the inner hole of the extrusion sleeve is 0.8-1.5 mm.

[0009] The height of the diaphragm is 1 mm greater than the stroke of the extrusion cylinder.

[0010] The lower end surface of the extrusion pin has a rounded corner of R0.5 in the circumferential direction.

[0011] The thickness of the upper end of the septum is 2.5 mm.

[0012] The slope of the outer wall of the diaphragm is 2.5°.

[0013] The bottom of the outer wall of the diaphragm has a rounded corner connected to the workpiece to be processed.

[0014] The beneficial effects of the utility model are as follows: (1) when the utility model is in use, the extrusion pin is inserted into the extrusion sleeve, the extrusion sleeve is sleeved outside the diaphragm, and the diaphragm is between the extrusion pin and the extrusion sleeve, so as to ensure that the extrusion pin runs smoothly and avoids jamming; (2) when the extrusion oil cylinder is started, the extrusion pin moves down to the lower section of the inner hole of the extrusion sleeve, and there is a gap between the extrusion sleeve and the extrusion pin, and this gap can prevent the problem of jamming of the extrusion pin; (3) at the beginning, the bottom end of the extrusion pin enters the lower section of the inner hole of the extrusion sleeve to a certain depth (that is, the extrusion pin enters the diaphragm to a certain depth), and this depth is used as a sealing surface to prevent the aluminum liquid from rushing to the extrusion sleeve. The gap between the extrusion pin and the extrusion sleeve can prevent the extrusion pin from sticking to aluminum and getting stuck or even getting stuck; (4) A cooling water channel is provided inside the extrusion pin. During the local extrusion process, a high-pressure spot cooling device is used to pass water through the extrusion pin to prevent the extrusion pin from being too hot and causing the workpiece surface to adhere to the extrusion pin, further solving the problem of the extrusion pin getting stuck during operation; (5) The lower end of the extrusion pin inserted into the extrusion sleeve is a cylindrical structure with equal upper and lower diameters (that is, the lower section of the extrusion pin is a single-section structure), which can prevent the aluminum liquid from rushing into the gap between the extrusion sleeve and the extrusion pin during extrusion, causing the extrusion pin to get stuck.

[0015] In summary, the use of the extrusion pin device of the utility model for local extrusion can ensure smooth local extrusion production, reduce the frequency of jamming, improve production efficiency, ensure production stability, extend the service life of the extrusion pin, reduce shrinkage defects, and improve the quality and performance of castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a local extrusion pin assembly produced by aluminum alloy die casting in one embodiment of the utility model during local extrusion;

[0017] Figure 2 yes Figure 1Schematic diagram of the extrusion pin and the extrusion sleeve;

[0018] Figure 3 It is a schematic diagram of the septum;

[0019] Figure 4 yes Figure 3 Cross-sectional view of the septal skin;

[0020] Figure 5 yes Figure 1 A partial cross-sectional view of the extrusion pin in the initial state;

[0021] Figure 6 yes Figure 1 A partial diagram of the cooperation between the middle extrusion sleeve and the diaphragm;

[0022] Figure 7 yes Figure 1 A partial enlarged view of the lower end of the middle extrusion pin.

[0023] In the figure: 1-extrusion cylinder, 2-extrusion pin, 2.1-cooling water circuit, 2.2-inlet, 2.3-outlet, 3-extrusion sleeve, 4-skin, 5-workpiece to be processed. DETAILED DESCRIPTION

[0024] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] The local extrusion pin assembly produced by aluminum alloy die casting in one embodiment of the utility model is as follows Figures 1 to 6 As shown, the partial extrusion pin assembly produced by aluminum alloy die-casting in this embodiment includes an extrusion cylinder 1, an extrusion pin 2, an extrusion sleeve 3 and a partition 4, the upper end of the extrusion pin 2 is connected to the extrusion cylinder 1, and the lower end of the extrusion pin 2 is inserted into the extrusion sleeve 3, a cooling water channel 2.1 is provided inside the extrusion pin 2, and an inlet 2.2 and an outlet 2.3 respectively connected to the two ends of the cooling water channel 2.1 are opened on the wall surface of the extrusion pin 2, and the lower end of the extrusion pin 2 inserted into the extrusion sleeve 3 is a cylindrical structure with equal upper and lower diameters; the inner hole of the extrusion sleeve 3 is divided into upper and lower sections, the diameter of the upper section of the inner hole of the extrusion sleeve 3 is smaller than the diameter of the lower section, the bottom end of the extrusion pin 2 downwardly enters the inner hole of the extrusion sleeve 3, and there is a gap between the extrusion pin 2 and the upper section of the inner hole of the extrusion sleeve 3; the gap between the extrusion pin 2 and the upper section of the inner hole of the extrusion sleeve 3 is 2~3 wires.

[0026] The diaphragm 4 is connected to the workpiece 5 to be processed, and the diaphragm 4 adopts an annular sleeve structure, and the height of the diaphragm 4 is greater than the stroke of the extrusion cylinder 1; the lower section of the inner hole of the extrusion sleeve 3 is clamped on the outer periphery of the diaphragm 4, and the outer peripheral surface of the diaphragm 4 contacts and cooperates with the wall surface of the lower section of the inner hole of the extrusion sleeve 3. The inner hole of the diaphragm 4 is for the extrusion pin to be inserted. Initially, the depth of the bottom end of the extrusion pin 2 entering the lower section of the inner hole of the extrusion sleeve 3 is equal to the difference between the height of the diaphragm 4 and the stroke of the extrusion cylinder. After extrusion, the bottom of the extrusion pin 2 enters the bottom of the inner hole of the diaphragm 4.

[0027] Initially, the bottom end of the extrusion pin 2 enters the lower section of the inner hole of the extrusion sleeve 3 to a depth of 0.8-1.5 mm. In this embodiment, the bottom end of the extrusion pin 2 enters the lower section of the inner hole of the extrusion sleeve 3 to a depth of 1 mm. The lower end surface of the extrusion pin 2 has a fillet of R0.5 on the circumference.

[0028] The lower section of the inner hole of the extrusion sleeve 3 is a tapered hole that gradually expands downward. The outer diameter of the septum 4 gradually increases from top to bottom, and the inner diameter of the septum 4 remains unchanged from top to bottom. The thickness of the upper end of the septum 4 is 2.5 mm, and the slope of the outer wall of the septum 4 is 2.5°. The bottom of the outer wall of the septum 4 has a fillet connected to the workpiece 5 to be processed.

[0029] The stroke of the extrusion cylinder is the distance of the extrusion pin stroke extrusion, so the height of the diaphragm is 1mm larger than the stroke of the extrusion cylinder. When in use, the extrusion pin is inserted into the extrusion sleeve, and the extrusion sleeve is placed in the diaphragm. The extrusion cylinder is started to drive the extrusion pin down to the lower section of the inner hole of the extrusion sleeve, so that the lower end of the extrusion pin enters 1mm from the lower section of the inner hole of the extrusion sleeve. This 1mm is used as a sealing surface to prevent aluminum liquid from rushing into the gap between the extrusion pin and the extrusion sleeve, and to avoid the extrusion pin from sticking to aluminum and even getting stuck.

[0030] The extrusion sleeve is a component that protects the mold core. If there is no extrusion sleeve, the extrusion pin will rub against the mold core continuously, causing damage to the mold core. The repair cost of a damaged mold core is high, so an extrusion sleeve is used to wrap the extrusion pin. During the movement of the extrusion pin, if the extrusion sleeve is damaged, the extrusion sleeve can be replaced. In this embodiment, the outer diameter of the extrusion pin is 15.95 mm, and the upper diameter of the inner hole of the extrusion sleeve is 16 mm. Therefore, the gap between the extrusion pin and the extrusion sleeve is about 2.5 wires.

[0031] There is a cooling water channel inside the extrusion pin. During the local extrusion process, high-pressure spot cooling equipment is used to pass water through the extrusion pin to prevent the extrusion pin from being too hot and causing the workpiece surface to adhere to the extrusion pin, resulting in the extrusion pin running stuck.

[0032] The separator 4 is a structure integrally cast with the workpiece 5 to be processed. Figure 5As shown in the figure, the inclination of the diaphragm is 2.5° on one side, which is convenient for demoulding the extrusion pin. If the inclination is too small, the diaphragm is easy to adhere to the extrusion pin, resulting in jamming or even jamming during operation. After the local extrusion process of the workpiece is completed, the diaphragm is cut off from the workpiece and then the subsequent processing steps are carried out.

[0033] Since the extrusion pin will have friction with the septum of each product during the movement, the root of the outer surface of the septum increases the fillet R1, mainly to reduce the stress concentration caused by the sharp angle, which causes the septum to break during the friction process, affecting the appearance of the product. Even the broken septum adheres to the extrusion pin, affecting the product quality. In this embodiment, the septum also has an inclination, so the septum has a large end and a small end. The thickness of the small end of the septum is the smallest, the thickness of the large end of the septum is the largest, and the thickness of the small end of the septum is 2.5mm, which prevents the septum from being broken during the movement of the extrusion pin.

[0034] A fillet of R0.5 is set at the lower end of the extrusion pin. The function of this fillet is the same as the fillet at the root of the outer surface of the septum, which is also to prevent the septum from breaking during the movement of the extrusion pin.

[0035] Using the extrusion pin device of this embodiment for local extrusion can ensure smooth local extrusion production, reduce the frequency of jamming, improve production efficiency, ensure production stability, extend the service life of the extrusion pin, reduce shrinkage defects, and improve the quality and performance of castings.

[0036] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Without departing from the spirit and scope of the utility model, the utility model may also have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A local extrusion pin assembly produced by aluminum alloy die casting, comprising an extrusion cylinder, an extrusion pin and an extrusion sleeve, wherein the upper end of the extrusion pin is connected to the extrusion cylinder, and the lower end of the extrusion pin is inserted into the extrusion sleeve, characterized in that: A cooling water channel is provided inside the extrusion pin, and an inlet and an outlet are provided on the wall of the extrusion pin, which are respectively connected to the two ends of the cooling water channel; the lower end of the extrusion pin inserted into the extrusion sleeve is a cylindrical structure with equal upper and lower diameters; the inner hole of the extrusion sleeve is divided into upper and lower sections, the diameter of the upper section of the inner hole of the extrusion sleeve is smaller than the diameter of the lower section, the bottom end of the extrusion pin enters the inner hole of the extrusion sleeve downward, and there is a gap between the extrusion pin and the upper section of the inner hole of the extrusion sleeve; the local extrusion pin assembly produced by aluminum alloy die-casting also includes a diaphragm, which is connected to the workpiece to be processed, and the diaphragm adopts an annular sleeve structure, and the height of the diaphragm is greater than the stroke of the extrusion cylinder; the lower section of the inner hole of the extrusion sleeve is engaged with the outer periphery of the diaphragm, and the outer peripheral surface of the diaphragm contacts and cooperates with the wall surface of the lower section of the inner hole of the extrusion sleeve, and the inner hole of the diaphragm is for the extrusion pin to be inserted. Initially, the depth of the bottom end of the extrusion pin entering the lower section of the inner hole of the extrusion sleeve is equal to the difference between the height of the diaphragm and the stroke of the extrusion cylinder. After extrusion, the bottom of the extrusion pin enters the bottom of the inner hole of the diaphragm.

2. The local extrusion pin assembly produced by aluminum alloy die casting according to claim 1, characterized in that: The gap between the extrusion pin and the upper section of the inner hole of the extrusion sleeve is 2 to 3 threads.

3. The local extrusion pin assembly produced by aluminum alloy die casting according to claim 1, characterized in that: The lower section of the inner hole of the extrusion sleeve is a tapered hole that gradually expands downward; the outer diameter of the diaphragm gradually increases from top to bottom, and the inner diameter of the diaphragm remains unchanged from top to bottom.

4. The local extrusion pin assembly produced by aluminum alloy die casting according to claim 1, characterized in that: Initially, the depth of the bottom end of the extrusion pin entering the lower section of the inner hole of the extrusion sleeve is 0.8-1.5 mm.

5. The local extrusion pin assembly produced by aluminum alloy die casting according to claim 4, characterized in that: The height of the diaphragm is 1 mm greater than the stroke of the extrusion cylinder.

6. The local extrusion pin assembly produced by aluminum alloy die casting according to claim 1, characterized in that: The lower end surface of the extrusion pin has a rounded corner of R0.5 in the circumferential direction.

7. The local extrusion pin assembly produced by aluminum alloy die casting according to claim 1, characterized in that: The thickness of the upper end of the septum is 2.5 mm.

8. The local extrusion pin assembly produced by aluminum alloy die casting according to claim 7, characterized in that: The slope of the outer wall of the diaphragm is 2.5°.

9. The local extrusion pin assembly produced by aluminum alloy die casting according to claim 1, characterized in that: The bottom of the outer wall of the diaphragm has a rounded corner connected to the workpiece to be processed.

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