Die-casting die

Abstract

The utility model relates to a die-casting die, which comprises a die, the die comprises a fixed die and a movable die, the fixed die is used for molding a molded product, the movable die is positioned below the fixed die, and the molded product can be molded by injecting molten materials under the state that die cavities of the fixed die and the movable die are combined; the overflow groove is formed in at least one of the fixed mold and the movable mold in the mode that the overflow pouring gate is communicated with the mold cavity, the overflow groove is used for leading out fluid pressed and pulled in the mold cavity, and the fluid comprises molten metal and gas; the exhaust channel is arranged at the downstream of the overflow groove and is used for discharging the fluid; the injection mold further comprises an air exhaust mechanism for secondarily exhausting fluid in the overflow groove, and the air exhaust mechanism can be selectively and independently additionally arranged outside the fixed mold or the movable mold in the state that the air displacement of the air exhaust channel does not meet the required air exhaust amount. The secondary air exhaust mechanism is additionally arranged outside the die, so that the die-casting die which is limited in installation space and high in casting quality requirement can still meet the air exhaust requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure casting, in particular to a pressure casting die. Background Art

[0002] In order to immediately discharge the gas in the mold cavity when designing the existing mold, a vacuum die-casting method has appeared in the prior art, that is, the gas in the mold cavity is first extracted by using a vacuum system, such as the Chinese utility model patent "A Die-casting Mold for a Cam Bearing Cover" with application number CN202322215649.2 (authorization announcement number CN220612255U). The overflow groove in the die-casting mold is connected to the exhaust block through an exhaust flow channel. The setting of the above-mentioned exhaust block requires a curved exhaust flow channel to be arranged on the rear side of the overflow groove. The pressure difference of the exhaust flow channel is small, the exhaust traction force is small, and the exhaust volume cannot meet the quality requirements of the casting. Therefore, the die-casting mold is respectively provided with exhaust blocks on the left side, right side and middle front side of the mold frame. Of course, the more exhaust blocks are provided, the better the exhaust effect. Since a wavy buffer channel needs to be set up in the exhaust block, the overall volume is relatively large. At the same time, the exhaust block needs to be used in conjunction with the exhaust channel set up inside the mold. When the installation space around the mold frame does not allow, for castings with high molding quality requirements, the setting of the exhaust block obviously cannot meet its exhaust requirements, which will naturally cause the scrap rate of the castings to rise and increase production costs. Therefore, further improvements are needed. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a die-casting mold which can meet the exhaust requirements of castings with high quality requirements under the premise of limited installation space in view of the above-mentioned existing technical status.

[0004] The technical solution adopted by the present invention to solve the above technical problems is as follows: the die-casting mold includes:

[0005] A mold, comprising a fixed mold for molding a molded product and a movable mold located below the fixed mold, wherein the molded product can be molded by injecting molten material when the mold cavities of the fixed mold and the movable mold are combined;

[0006] An overflow trough is formed in at least one of the fixed mold and the movable mold in a manner that is connected to the mold cavity by means of an overflow gate, and is used to lead out the fluid pressed and pulled in the mold cavity, wherein the fluid includes the previous molten metal and gas;

[0007] an exhaust channel, disposed downstream of the overflow tank, for discharging the fluid;

[0008] It is characterized in that it also includes an exhaust mechanism for secondary discharge of the above-mentioned fluid in the overflow trough. When the exhaust volume of the exhaust channel does not meet the required exhaust volume, the exhaust mechanism can be selectively and independently installed on the outside of the fixed mold or the movable mold.

[0009] To facilitate extraction of gas from the mold cavity, the exhaust mechanism is preferably disposed on the fixed mold. Accordingly, the fixed mold is provided with an exhaust port independent of the exhaust channel and a mounting channel for disposing the exhaust mechanism. The exhaust port, the mounting channel, and the overflow groove are in fluid communication. During the die-casting process, the movable mold and the fixed mold overlap, forming a mold cavity between the movable mold and the fixed mold. Gas within the mold cavity is exhausted through the overflow groove. The exhaust mechanism is disposed within the mounting channel of the fixed mold. Under the action of the exhaust mechanism, gas can be discharged from the overflow groove through the mounting channel and ultimately through the exhaust port.

[0010] In order to facilitate the control of the exhaust state of the exhaust mechanism, it is preferred that the exhaust mechanism includes a valve body structure disposed within the installation channel and an exhaust member disposed at the end of the exhaust port. The exhaust mechanism also includes a switching mechanism disposed outside the installation channel, which acts on the valve body structure to selectively switch between an open and closed state of the exhaust port. The switching mechanism primarily provides power for the valve body mechanism. When the switching mechanism controls the valve body to move to a position that opens the exhaust port, the exhaust member begins to exhaust air from the cavity. When the exhaust volume reaches a set value, the switching mechanism controls the valve body to move to a position that closes the exhaust port, at which point the exhaust member stops working and the secondary exhaust is completed.

[0011] Furthermore, the valve body structure includes a valve body arranged in the installation channel, and the valve body is provided with an outlet channel respectively connected to the exhaust port and a communication channel connected to the overflow groove;

[0012] a valve stem, the valve stem being inserted into the communication passage of the valve body, with an outer end thereof being exposed outside the communication passage and being connected to the switching mechanism;

[0013] The valve core is disposed at the inner end of the valve stem and moves synchronously with the valve stem. When the valve core is switched to an open state by the switching mechanism, the overflow groove communicates with the outlet passage and the exhaust port, thereby achieving an exhaust operation. The valve body allows gas entering the communication passage from the overflow groove to enter the outlet passage, and the switching mechanism provides power to the valve stem, enabling the valve stem to drive the valve core to move and thereby control the opening and closing of the valve body.

[0014] In order to control the movement direction of the valve stem, the switching mechanism preferably includes a cylinder, and an oil inlet pipe and an oil return pipe are provided at intervals on the upper and lower sides of the cylinder. The oil inlet pipe is used to control the valve stem to drive the valve core to move in the negative Z direction and thus close the exhaust port, and the oil return pipe is used to control the valve stem to drive the valve core to retreat in the positive Z direction and thus open the exhaust port. The cylinder serves as a driving source. When hydraulic oil enters the oil inlet pipe of the cylinder, the cylinder can push the valve stem downward under the action of pressure, thereby closing the exhaust port. At this time, the gas in the cavity cannot be extracted; when the hydraulic oil exits the oil return pipe of the cylinder, the pressure of the oil in the cylinder decreases, the valve stem drives the valve core to retreat upward, thereby opening the exhaust port, and the exhaust mechanism begins to extract air.

[0015] In order to exhaust the gas out of the cavity, it is preferred that an exhaust pipe is provided at the end of the exhaust port, and the exhaust pipe is further connected to the exhaust member. Driven by the exhaust member, the gas in the cavity can flow from the overflow groove along the connecting channel and the outlet channel and finally be exhausted to the outside of the cavity through the exhaust pipe.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. When high quality castings are required and the installation space around the mold frame is limited, the exhaust mechanism can be selectively installed independently on the outside of the fixed mold or the movable mold to perform secondary exhaust of the cavity. The exhaust mechanism reduces the occurrence of porosity in the product while meeting the exhaust requirements, thereby improving product quality.

[0018] 2. After the exhaust mechanism is installed on the mold, it can form a channel connected with the overflow groove for fluid discharge, eliminating the complex exhaust channel opened inside the mold in the traditional exhaust system, so it can be installed independently on the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of the utility model;

[0020] Figure 2 This is a transverse cross-sectional view of an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of a partial three-dimensional structure of an embodiment of the utility model;

[0022] Figure 4 A partial longitudinal cross-sectional schematic diagram of an embodiment of the present utility model;

[0023] Figure 5 This is a partial exploded schematic diagram of an embodiment of the present utility model;

[0024] Figure 6 This is a longitudinal cross-sectional view of the valve body structure of an embodiment of the present utility model.

[0025] In the figure: 1. Mold; 11. Fixed mold; 111. Exhaust port; 112. Mounting channel; 12. Moving mold; 2. Overflow groove; 3. Exhaust channel; 4. Exhaust pipe; 5. Exhaust mechanism; 51. Valve body structure; 511. Valve body; 512. Valve stem; 513. Valve core; 514. Connecting channel; 515. Exhaust channel; 52. Switching mechanism; 521. Oil cylinder; 522. Oil inlet pipe; 523. Oil return pipe; 6. Exhaust block; 7. Exhaust part. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 6 The figure shows an optimal embodiment of the present invention. The die-casting mold comprises a mold 1, which comprises a fixed mold 11 for molding a molded product and a movable mold 12 located below the fixed mold 11. When the mold cavities of the fixed mold 11 and the movable mold 12 are combined, the molded product can be molded by injecting molten material; an overflow groove 2 is formed in at least one of the fixed mold 11 and the movable mold 12 by means of an overflow gate connected to the mold cavity, and the overflow groove 2 is used to lead out the fluid pressed and pulled in the mold cavity, and the fluid includes previously molten metal and gas; an exhaust channel 3 is provided downstream of the overflow groove 2, and the exhaust channel 3 is used to discharge the above-mentioned fluid; and an exhaust mechanism 5 for secondary exhaust of the above-mentioned fluid in the overflow groove 2. When the exhaust volume of the exhaust channel 3 does not meet the required exhaust volume, the exhaust mechanism 5 can be selectively and independently installed on the outside of the fixed mold 11 or the movable mold 12.

[0028] refer to Figure 1 At present, the main method of vacuum die-casting is to use exhaust blocks 6 for exhaust, wherein the exhaust blocks 6 are usually arranged around the mold 1. The mold 1 of this embodiment uses exhaust blocks 6 to exhaust the cavity once. The exhaust block 6 is arranged on the side of the mold frame, wherein one end of the exhaust block 6 is connected to the exhaust channel 3 inside the fixed mold 11, and the other end is externally connected to the exhaust member 7. Since a wavy slow flow channel needs to be set inside the exhaust block 6, the overall volume is relatively large, and the installation space around the mold frame of this embodiment is limited, it is impossible to install additional exhaust blocks 6, and the exhaust volume of a single exhaust block 6 is limited. In order to further extract the gas in the cavity, reference is made to the following examples: Figure 4In this embodiment, the exhaust mechanism 5 is disposed on the fixed mold 11. Accordingly, the fixed mold 11 is provided with an exhaust port 111 independent of the exhaust channel 3 and a mounting channel 112 for mounting the exhaust mechanism 5. The exhaust port 111, the mounting channel 112, and the overflow trough 2 are in fluid communication. During the die-casting process, the movable mold 12 and the fixed mold 11 overlap each other, forming a cavity between them. Gas within the cavity is discharged through the overflow trough 2. The exhaust mechanism 5 is disposed within the mounting channel 112 of the fixed mold 11. Under the action of the exhaust mechanism 5, gas can flow from the overflow trough 2 through the mounting channel 112 into the exhaust port 111.

[0029] refer to Figure 3 and Figure 5 The exhaust mechanism 5 includes a valve body structure 51 disposed in the installation channel 112 and an exhaust member 7 disposed at the end of the exhaust port 111. The exhaust mechanism 5 also includes a switching mechanism 52 disposed outside the installation channel 112. The switching mechanism 52 acts on the valve body structure 51 so that it can selectively switch between the state of opening or closing the exhaust port 111. The switching mechanism 52 mainly provides power for the valve body structure 51. When the switching mechanism 52 controls the valve body 511 to move to a position that opens the exhaust port 111, the exhaust member 7 starts to exhaust the cavity. When the exhaust volume reaches the set value, the switching mechanism 52 controls the valve body 511 to move to a position that closes the exhaust port 111. At this time, the exhaust member 7 stops working and the secondary exhaust is completed. Figures 4 to 6 The valve body structure 51 includes a valve body 511 disposed in the installation channel 112. The valve body 511 is provided with an outlet channel 515 connected to the exhaust port 111 and a communication channel 514 connected to the overflow groove 2. The valve body 511 in this embodiment is equivalent to a two-way structure, wherein the communication channel 514 is longitudinally arranged in the valve body 511, and the outlet channel 515 is transversely arranged in the valve body 511. The special structure of the valve body 511 allows the gas entering the communication channel 514 from the overflow groove 2 to enter. Inlet and outlet channels 515; the valve body structure 51 also includes a valve stem 512 and a valve core 513, wherein the valve stem 512 penetrates into the connecting channel 514 of the valve body 511, and its outer end is exposed outside the connecting channel 514 and is connected to the switching mechanism 52; the valve core 513 is arranged at the inner end of the valve stem 512 and moves synchronously with the valve stem 512. When the valve core 513 is switched to the open state by the switching mechanism 52, the overflow groove 2 is connected with the outlet channel 515 and the exhaust port 111, thereby realizing the exhaust operation.

[0030] The main function of the switching mechanism 52 is to provide power for the movement of the valve stem 512. In this embodiment, the switching mechanism 52 is preferably an oil cylinder 521. Figure 3 and Figure 5An oil inlet pipe 522 and an oil return pipe 523 are provided at intervals on the upper and lower sides of the oil cylinder 521. The oil inlet pipe 522 is used to control the valve stem 512 to drive the valve core 513 to move in the negative Z direction, thereby closing the exhaust port 111. The oil return pipe 523 is used to control the valve stem 512 to drive the valve core 513 to retreat in the positive Z direction, thereby opening the exhaust port 111. The oil cylinder 521 serves as a driving source. When hydraulic oil enters the oil inlet pipe 522 of the oil cylinder 521, the oil cylinder 521 can push the valve stem 512 downward under the action of pressure, thereby closing the exhaust port 111. At this time, the gas in the cavity cannot be extracted. When the hydraulic oil flows out of the oil return pipe 523 of the oil cylinder 521, the pressure of the oil in the oil cylinder 521 decreases, the valve stem 512 drives the valve core 513 to retreat upward, thereby opening the exhaust port 111, and the exhaust mechanism 5 starts to extract air.

[0031] refer to Figures 3 to 5 At the end of the exhaust port 111, an exhaust pipe 4 is provided, to which an exhaust member 7 is connected. The exhaust member 7 is preferably a vacuum machine. Driven by the vacuum machine, the gas in the cavity can be discharged from the overflow trough 2 along the connecting channel 514 and the outlet channel 515, and finally discharged to the outside of the cavity through the exhaust pipe 4. Although the exhaust pipe 4 is also installed on the side wall of the mold 1, the overall volume of the exhaust pipe 4 is smaller than that of the exhaust block 6, and it does not need to be used in conjunction with the exhaust channel inside the mold 1.

[0032] The working process of this embodiment is as follows: the hydraulic oil of the cylinder 521 is discharged from the return oil pipe 523, at this time the pressure decreases, the cylinder 521 drives the valve stem 512 and the valve core 513 to move upward, the position of the exhaust port 111 is opened, and under the action of the vacuum component 7, the gas in the cavity can be discharged from the overflow groove 2 along the connecting channel 514 and the air outlet channel 515 to the outside of the cavity through the vacuum pipe 4; after the vacuum volume reaches the set value, the oil inlet pipe 522 of the cylinder 521 starts to input hydraulic oil, at this time the pressure in the cylinder 521 increases, the cylinder 521 drives the valve stem 512 and the valve core 513 to reset downward and close the exhaust port 111.

Claims

1. A die-casting mold, comprising: A mold (1), wherein the mold (1) includes a fixed mold (11) for molding a molded product and a movable mold (12) located below the fixed mold (11), and the molded product can be molded by injecting molten material when the mold cavities of the fixed mold (11) and the movable mold (12) are combined; An overflow trough (2) is formed in at least one of the fixed mold (11) and the movable mold (12) in a manner that the overflow gate is connected to the mold cavity, and is used to lead out the fluid pressed and pulled in the mold cavity, wherein the fluid includes the previous molten metal and gas; an exhaust channel (3), arranged downstream of the overflow trough (2), and used for discharging the fluid; Its characteristics are: The invention also includes an exhaust mechanism (5) for secondary exhaust of the fluid in the overflow groove (2). When the exhaust volume of the exhaust channel (3) does not meet the required exhaust volume, the exhaust mechanism (5) can be selectively and independently installed outside the fixed mold (11) or the movable mold (12).

2. The die-casting mold according to claim 1, characterized in that: The air extraction mechanism (5) is arranged on the fixed mold (11). Correspondingly, the fixed mold (11) is provided with an exhaust port (111) independent of the exhaust channel (3) and a mounting channel (112) for arranging the air extraction mechanism (5). The exhaust port (111), the mounting channel (112) and the overflow groove (2) are fluidically connected.

3. The die-casting mold according to claim 2, characterized in that: The air extraction mechanism (5) comprises a valve body structure (51) arranged in the installation channel (112) and an air extraction member (7) arranged at the end of the exhaust port (111). The air extraction mechanism (5) further comprises a switching mechanism (52) arranged outside the installation channel (112). The switching mechanism (52) acts on the valve body structure (51) so that the valve body structure can selectively switch between the state of opening or closing the exhaust port (111).

4. The die-casting mold according to claim 3, characterized in that: The valve body structure (51) includes a valve body (511) disposed in the installation channel (112), and the valve body (511) is provided with an air outlet channel (515) respectively connected to the exhaust port (111) and a communication channel (514) connected to the overflow groove (2); a valve stem (512), the valve stem (512) being inserted into the communication passage (514) of the valve body (511), with its outer end exposed outside the communication passage (514), and being connected to the switching mechanism (52); The valve core (513) is arranged at the inner end of the valve stem (512) and moves synchronously with the valve stem (512). When the valve core (513) is switched to an open state by the switching mechanism (52), the overflow groove (2) is connected to the air outlet channel (515) and the exhaust port (111), thereby realizing an exhaust operation.

5. The die-casting mold according to claim 4, characterized in that: The switching mechanism (52) comprises an oil cylinder (521), and an oil inlet pipe (522) and an oil return pipe (523) are arranged at intervals on the upper and lower sides of the oil cylinder (521). The oil inlet pipe (522) is used to control the valve stem (512) to drive the valve core (513) to move along the negative Z direction and thereby close the exhaust port (111), and the oil return pipe (523) is used to control the valve stem (512) to drive the valve core (513) to retreat along the positive Z direction and thereby open the exhaust port (111).

6. The die-casting mold according to any one of claims 3 to 5, characterized in that: An exhaust pipe (4) is provided at the end of the exhaust port (111), and the exhaust pipe (4) is also connected to the exhaust member (7).

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