Movable die of high-pressure casting die

Abstract

The utility model relates to the technical field of engine box body molds, in particular to a high-pressure casting mold movable mold which comprises a sliding block and an insert fixed in the sliding block. An inner cooling unit is arranged in the insert, and an outer cooling unit is arranged below the insert; the inner cooling unit comprises a center cooling assembly located in the middle of the insert and a side cooling assembly located below the center cooling assembly. According to the scheme, the inner cooling unit conveniently and uniformly exchanges heat in the insert, the outer cooling unit cools the outer surface of the insert from the outside, and the heat dissipation effect of the insert is effectively improved through internal and external collaborative cooling, so that a workpiece cavity is prevented from being strained due to the fact that molten metal adheres to the insert during demolding, the workpiece can be prevented from being scrapped, and the production efficiency is improved. The service life of the mold can be effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine box mould, concretely is high pressure casting mould movable mould. BACKGROUND

[0002] High pressure die casting is a process of sending molten metal into a mould and solidifying to obtain a desired part. The molten metal is pressed into a mould cavity under high pressure (usually hydraulic pressure), and then the molten metal is solidified in the mould cavity to form a casting. This process can produce complex metal products such as automobile engine boxes, transmission boxes and engineering machinery parts, and has high production efficiency and high product precision, and is widely used in various industrial productions.

[0003] In the process of high pressure casting, the cooling system of the mould has a crucial influence on the quality and production efficiency of the casting. However, due to the complexity of the mould design, especially the shielding area such as deep cavity, groove, raised edge and narrow space, it is difficult to achieve good cooling effect. Poor cooling effect not only may cause thermal stress, shrinkage defects in the casting, sticking and pulling caused by high mould temperature, but also may affect the service life and production efficiency of the mould. Therefore, it is necessary to set a cooling structure inside the mould for these complex structure areas. For example, the prior art "a quick cooling die casting mould core pulling device" sets a cooling pipe inside the mould core for casting a deep hole of a transmission bottom shell, and the cooling water flows in the cooling pipe to cool and cool the mould. However, the prior art still has the following technical problems:

[0004] The cooling method of the prior art is to set a cooling channel inside the mould, and the cooling water can only take away the heat of the mould from the inside when flowing in the mould. However, for the insert mould, the outer surface of the insert mould directly contacts the molten metal when the product is pressure cast, so that the temperature of the outer surface of the mould is high. Only the internal cooling method can not effectively cool the mould, which may cause the problems of poor heat dissipation effect, sticking and reduced service life of the mould. TECHNICAL CONTENT

[0005] The utility model provides high pressure casting mould movable mould, can solve the cooling method of the prior art of die casting mould only can take away heat from the inside of the mould, and cannot cool the outside of the mould, which leads to poor overall cooling effect of the mould and causes sticking.

[0006] The application provides the following technical scheme: a high pressure casting mould movable mould, comprising a sliding block and an insert fixed in the sliding block;

[0007] An internal cooling unit is arranged in the insert, and an external cooling unit is arranged below the insert.

[0008] The inner cooling unit comprises a central cooling assembly located in the middle of the insert and a side cooling assembly located below the central cooling assembly.

[0009] Advantages:

[0010] The mold heat dissipation capacity is improved, the workpiece is prevented from being scrapped, and the mold life is improved. After the insert is withdrawn from the workpiece after pressure casting, a cavity is formed on the workpiece. If the temperature of the insert is too high, the molten metal is easy to adhere to the outer surface of the insert, and the inner wall surface of the cavity of the workpiece is easy to be damaged when the insert is withdrawn, resulting in waste products. The central cooling assembly and the side cooling assembly are arranged in the insert, the central cooling assembly is located in the middle of the insert, the heat exchange of the insert is uniform, the side cooling assembly is easy to absorb the heat of the outer surface of the insert, and the heat exchange effect is improved. At the same time, the outer cooling unit cools the outer surface of the insert from the outside. Through the internal and external cooperative cooling, the heat dissipation effect of the insert is effectively improved, so that the molten metal is prevented from adhering to the insert to cause the cavity of the workpiece to be damaged when the mold is withdrawn. Not only can the workpiece be prevented from being scrapped, but also the mold life can be effectively improved.

[0011] Further, the outer cooling unit comprises a cooling pipeline arranged below the insert, and a hole is arranged on the cooling pipeline, and the hole faces the lower side of the insert.

[0012] Advantages: The cooling pipeline is convenient for feeding the demolding agent. The demolding agent enters the cooling pipeline and is sprayed to the outer surface of the insert from the hole, so that the outer surface of the insert is cooled and dissipated.

[0013] Further, the central cooling assembly comprises a first high-pressure point cooling pipe extending into the center of the insert.

[0014] Advantages: The first high-pressure point cooling pipe is located in the center of the insert, and the heat exchange of the insert is more uniform, and the heat exchange efficiency is improved.

[0015] Further, the side cooling assembly comprises a second high-pressure point cooling pipe located below the first high-pressure point cooling pipe, and a core is arranged in the insert, and the second high-pressure point cooling pipe extends into the core.

[0016] Advantages: The second high-pressure point cooling pipe is closer to the outer surface of the insert, so that the heat exchange of the part of the insert which is easy to adhere to the molten metal is more effective, and the sticking phenomenon is prevented.

[0017] Further, the first high-pressure point cooling pipe and the second high-pressure point cooling pipe each comprise an inner pipe and an outer pipe sleeved outside the inner pipe, and the inner pipe and the outer pipe are in communication.

[0018] Advantages: The cooling liquid can enter the inner pipe and then flow into the outer pipe. The outer pipe is in contact with the insert, so that the heat exchange of the insert is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an axonometric view of the present invention.

[0020] Figure 2 Based Figure 1 Axonometric view after the slider is removed.

[0021] Figure 3 for Figure 1 Axial view of the connection relationship between the hydraulic cylinder, slider and insert.

[0022] Figure 4 This is an axial view of the positional relationship between the insert, the first high-pressure spot cooling tube, the second high-pressure spot cooling tube, and the cooling channel.

[0023] Figure 5 A half-section view of the interior of the insert. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] The marks in the drawings of the specification include: hydraulic cylinder 1, mounting platform 2, core 3, insert 4, slider 5, cooling pipe 6, fixing seat 7, first high-pressure spot cooling pipe 8, second high-pressure spot cooling pipe 9, pressing block 10, hole 11, connector 12, inlet 13, outlet 14, inner tube 15, outer tube 16, core 17.

[0026] Example 1

[0027] like Figures 1 to 5 As shown, this embodiment is for die-casting a casing of a general-purpose engine. The overall mold includes a mounting platform 2 fixed to a mold core 3 at the center of the mounting platform 2. The die-cast workpiece is located on the mold core 3. The mounting platform 2 is slidably connected to a movable mold in four directions. The movable mold is driven by a hydraulic cylinder 1 set in four directions of the mounting platform 2. For the convenience of demonstration, Figure 1 The redundant hydraulic cylinder 1 and movable mold have been omitted, and only the movable mold related structure protected by this application is retained.

[0028] The movable mold of the high-pressure casting mold includes a slider 5, an insert 4 fixed inside the slider 5, an external cooling unit arranged below the insert 4, and an internal cooling unit arranged inside the insert 4. The tail of the slider 5 is connected to the broken end of the piston rod of the hydraulic cylinder 1, so that the hydraulic cylinder 1 can drive the slider 5 to move toward or away from the box body. The insert 4 of this embodiment is used to form the tappet hole of the box body.

[0029] like Figure 2 and Figure 4As shown, the outer cooling unit includes a cooling pipe 6 arranged on the mounting table 2, which is preferably made of copper. The cooling pipe 6 is located directly below the insert 4, and a hole 11 is arranged above the end of the cooling pipe 6, which is directed towards the lower surface of the insert 4. In order to avoid interference, the end of the cooling pipe 6 is shaped as a multi-turn heterogeneous structure, and a recessed mounting groove is arranged on the mold core 3, so that the end of the cooling pipe 6 is sunk into the mounting groove. The rod part of the cooling pipe 6 is fixed by a pressing block 10 screw, which is pressed on the mounting table 2. The cooling pipe 6 is convenient for the injection of the release agent, which enters the cooling pipe 6 and is sprayed to the outer surface of the insert 4 from the hole 11, so as to facilitate the cooling of the outer surface of the insert 4.

[0030] As shown in Figure 4 , the inner cooling unit in the insert 4 includes a center cooling assembly and a side cooling assembly. The center cooling assembly is located in the middle of the insert 4 and includes a first high-pressure point cooling pipe 8 extending into the center of the insert 4. The side cooling assembly is located below the center cooling assembly and includes a second high-pressure point cooling pipe 9, as shown in Figure 5 , the insert 4 is provided with a mold core 17, and the second high-pressure point cooling pipe 9 extends into the mold core 17. The first high-pressure point cooling pipe 8 and the second high-pressure point cooling pipe 9 have the same structure, both including an inner pipe 15 and an outer pipe 16 threaded on the outside of the inner pipe 15. The end of the inner pipe 15 is open, and the end of the outer pipe 16 is closed, so that the inner pipe 15 and the outer pipe 16 are in communication. The head of the first high-pressure point cooling pipe 8 and the second high-pressure point cooling pipe 9 is provided with a connector 12, and the connector 12 is provided with an inlet 13 and an outlet 14. The inlet 13 is in communication with the inner pipe 15, and the outlet 14 is in communication with the outer pipe 16. The part where the connector 12 is located is provided with a fixing seat 7, which is fixed on the end of the sliding block 5 by a screw. The head of the first high-pressure point cooling pipe 8 and the second high-pressure point cooling pipe 9 abuts against the fixing seat 7, which can prevent the first high-pressure point cooling pipe 8 and the second high-pressure point cooling pipe 9 from being pulled out of the insert 4.

[0031] The use method of the device is as follows:

[0032] The hydraulic cylinder 1 drives the sliding block 5 to slide towards the workpiece, and all the movable dies slide into position for die casting. The first high-pressure point cooling pipe 8 and the second high-pressure point cooling pipe 9 circulate cooling liquid throughout the process, and the cooling liquid enters the inner pipe 15 from the inlet 13, flows into the outer pipe 16 from the open end of the inner pipe 15, and then flows back to the outlet 14 at the connector 12 part, completing the circulation. In this process, heat exchange can be formed with the insert 4 and the mold core 17, and internal heat dissipation of the insert 4 is performed. After the completion of the one-time die casting process, the hydraulic cylinder 1 drives the sliding block 5 and the insert 4 to reset. At this time, the release agent in the cooling pipe 6 below the insert 4 is sprayed to the outer surface of the insert 4 from the hole 11, and the outer surface of the insert 4 is cooled to improve the heat dissipation efficiency of the insert 4 in combination with the internal and external cooling methods.

[0033] The above is only an embodiment of the present application, and the present application is not limited to the field of the embodiment, and the common knowledge such as specific structures and properties in the scheme is not described in detail herein. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of the claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A high-pressure casting mold movable mold, comprising a slide block and an insert fixed in the slide block, characterized in that: an inner cooling unit is arranged in the insert, and an outer cooling unit is arranged below the insert; the inner cooling unit comprises a center cooling assembly arranged in the middle of the insert and a side cooling assembly arranged below the center cooling assembly; the outer cooling unit comprises a cooling pipe arranged below the insert, and a hole is arranged on the cooling pipe and faces the lower side of the insert; the center cooling assembly comprises a first high-pressure point cooling pipe which extends into the center of the insert; the side cooling assembly comprises a second high-pressure point cooling pipe arranged below the first high-pressure point cooling pipe, and a core is arranged in the insert, and the second high-pressure point cooling pipe extends into the core; the first high-pressure point cooling pipe and the second high-pressure point cooling pipe each comprise an inner pipe and an outer pipe sleeved outside the inner pipe, and the inner pipe and the outer pipe are in communication. ​ ​ 2. The high-pressure die casting mold movable mold according to claim 1, characterized by: ​ 3. The high-pressure die casting mold movable mold according to claim 2, characterized by: ​ 4. The high-pressure die casting mold movable mold according to claim 3, characterized by: ​ 5. The high-pressure die casting die movable die according to claim 4, characterized in that: ​

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