Die-casting die

Abstract

The utility model relates to a die-casting die which comprises a die body, the die body comprises a fixed die and a movable die located below the fixed die, and die cavities of the fixed die and the movable die can be formed by injecting molten materials in the combined state. The overflow channel is formed in at least one of the fixed mold and the movable mold by means of a mode that an overflow pouring gate is communicated with the mold cavity and can be used for leading out fluid pressed and pulled in the mold cavity; the fluid comprises previous molten metal and gas; the device further comprises an exhaust block arranged at the tail end of the overflow channel, the overflow channel is locally provided with a slow flow section, the slow flow section comprises a first wall face forcing fluid to flow out in the preset deviation direction and a second wall face enabling the fluid to flow back to the overflow channel in the preset deviation direction, and the fluid finally flows out towards the exhaust block. The flow slowing section is arranged in the overflow channel, fluid flows out of the overflow channel in the preset deviation direction firstly through the flow slowing section and then flows back, in the process, speed reduction of molten metal is achieved, and gas in the overflow channel is not prone to being left and can be better exhausted through the exhaust block.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure casting technical field, concretely relates to a die casting die. BACKGROUND

[0002] In the die casting process, the filling speed of the high-pressure injected metal liquid in the mold is relatively fast, and the metal liquid fills the entire mold within 0.1s before the molten metal liquid solidifies, which at the same time also causes part of the air to be unable to be discharged due to retention, thereby forming air holes on the formed product, and further causing the product to be scrapped.

[0003] In order to solve the above technical problems, a patent number ZL201320723611.X (publication number CN203649361U) of the Chinese utility model patent "a vent block" discloses a vent block, which is composed of an upper vent block and a lower vent block, and the opposite surfaces are respectively provided with a tooth-shaped protrusion and a vent inner recess, and the tooth-shaped protrusion and the vent inner recess form a buffer aluminum liquid pressure storage position, thereby realizing pressure reduction and speed reduction, and preventing the aluminum liquid from flying out of the vent block. However, the vent block is arranged at the end of the entire exhaust passage, and the pressure reduction and speed reduction effect of the aluminum liquid is relatively limited, and at this time the air is still prone to residual.

[0004] Therefore, it is necessary to further improve the die casting mold. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problems that the prior art is provided with a die casting mold for reducing the flow speed of metal melt.

[0006] The utility model solves the technical problems by adopting the following technical scheme: the die casting mold comprises:

[0007] The mold comprises a fixed mold and a movable mold located below the fixed mold, and the mold cavity of the fixed mold and the movable mold can be combined to form a molded product by injecting molten material;

[0008] The overflow channel is arranged at the end of the overflow channel, and the overflow channel is connected to the mold cavity by means of an overflow gate.

[0009] The vent block is arranged at the end of the overflow channel.

[0010] Its characterized in that: along the flow direction of fluid, the overflow channel is partially provided with a slow flow section for slowing down the fluid flow speed, the slow flow section is equipped with a first wall surface and a second wall surface, the first wall surface is used to force the fluid to flow out in a preset offset direction, and the second wall surface is used to make the fluid flow back to the overflow channel in the preset offset direction, so that the fluid flows out towards the exhaust block.

[0011] In order to make the first wall surface and the second wall surface better dissipate the energy of the fluid, as a preferred, the first wall surface and / or the second wall surface are wall surfaces with plane or curved surface shape. Among them, the first wall surface and the second wall surface of the slow flow section are opened along the flow direction of the fluid, and the plane and curved first wall surface and second wall surface can make the fluid flow along the wall, increase the contact area of the fluid and the wall, thereby reducing the flow rate of the fluid.

[0012] In order to improve the energy dissipation effect of the slow flow section on the fluid, the slow flow section is provided with a plurality of, one or more adjacent slow flow sections are arranged in the same direction or are staggered on both sides of the overflow channel. Among them, the slow flow section increases the collision of the fluid and the wall surface in the slow flow section by forcing the fluid to flow out from the overflow channel in a preset direction and then flow back, but the speed reduction effect of a single slow flow section is limited, and multiple slow flow sections are needed to increase the collision of the fluid and the first wall surface and the second wall surface, thereby improving the speed reduction effect. The arrangement of each slow flow section can be arranged in the same direction or staggered on both sides according to the reserved space of the dynamic mode.

[0013] In order to facilitate processing, the slow flow section includes a straight section, an upward section arranged on one side of the straight section, and a downward section arranged on the other side. The direction of the upward section and the downward section is based on the up-down direction of the mold opening of the fixed mold and the dynamic mold. Among them, the setting mode of each slow flow section can have multiple forms, for example, it includes a left offset section, a straight section and a right offset section, and the offset angle can be designed arbitrarily, as long as the fluid can flow out from the overflow channel and then flow back into the overflow channel. The slow flow section is designed as a regular upward section, a straight section and a downward section.

[0014] In order to enhance the exhaust effect, as a preferred, the overflow channel is symmetrically arranged on the dynamic mode, and the overflow channel and the mold cavity are provided with an overflow groove. The gas in the mold cavity is first rapidly introduced by each overflow groove, and the symmetric arrangement of the overflow channel can make the gas in the mold cavity enter different overflow channels and be discharged, thereby improving the exhaust effect.

[0015] To further reduce the fluid velocity at the end, preferably, each of the venting blocks includes a first venting block and a second venting block arranged vertically, with the gap between the first and second venting blocks forming a venting channel. After passing through the narrow gap, the fluid velocity decreases sharply, allowing gas to escape from the end of the venting block, and the molten metal eventually cools and solidifies within the venting channel.

[0016] Furthermore, protrusions and grooves are spaced apart on the opposing surfaces of the first and second exhaust blocks, and the gaps left after the protrusions and grooves are fitted together constitute the exhaust groove. The exhaust groove can be designed in various forms, such as a straight gap. This application increases the exhaust area of ​​the exhaust groove by opening protrusions and grooves on the opposing surfaces of the first and second exhaust blocks, which is more conducive to the exhaust of gas, reduces the occurrence of air holes on the product, and improves the yield.

[0017] Furthermore, the width W of the venting groove is 0.6–1.2 mm. The main reasons are as follows: when the width of the venting groove is less than 0.6 mm, the gap is too small and the molten metal will block the venting groove due to rapid cooling during the flow, thus affecting the venting effect; when the width of the venting groove is greater than 1.2 mm, the gap is too large and the deceleration effect of the molten metal during the flow is poor, resulting in splashing from the venting block.

[0018] Compared with the prior art, the advantages of this utility model are as follows: This utility model has a slow flow section in the overflow channel, which includes a first wall and a second wall. The fluid can flow out of the overflow channel along a preset offset direction through the first wall, and then flow back to the overflow channel along the preset offset direction through the second wall. During this process, the fluid speed is reduced, and the gas in the overflow channel is less likely to remain, and can be better discharged by the exhaust block. Attached Figure Description

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

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

[0021] Figure 3 This is a longitudinal cross-sectional schematic diagram of an embodiment of the present invention (the fixed mold is omitted);

[0022] Figure 4 This is a schematic diagram of the overflow channel and the slow-flow section in an embodiment of this utility model;

[0023] Figure 5 This is a longitudinal cross-sectional schematic diagram of an embodiment of the present utility model.

[0024] In the diagram: 1. Fixed mold; 2. Moving mold; 3. Mold cavity; 4. Overflow channel; 5. Venting block; 51. First venting block; 52. Second venting block; 53. Protrusion; 54. Groove; 55. Venting channel; 6. Slow flow section; 61. First wall surface; 62. Second wall surface; 63. Rising section; 64. Straight section; 65. Falling section; 7. Overflow channel. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1 to 5 The diagram shows the preferred embodiment of this invention. The die-casting mold includes a mold, comprising a fixed mold 1 and a movable mold 2 located below the fixed mold 1. The cavities 3 of the fixed mold 1 and the movable mold 2, when joined, allow for the injection of molten material to form a molded product. It also includes an overflow channel 4 connected to the cavity 3 via an overflow gate, which is used to draw out fluid pressed against the cavity 3. The fluid includes molten metal and gas. Furthermore, it includes a venting block 5 located at the end of the overflow channel 4. The overflow channel 4 is partially provided with a slow-flow section 6 along the fluid flow direction to reduce the fluid flow rate. The slow-flow section 6 is equipped with a first wall 61 and a second wall 62. The first wall 61 forces the fluid to flow out in a predetermined offset direction, while the second wall 62 causes the fluid to flow back towards the overflow channel 4 in the predetermined offset direction, thereby causing the fluid to flow towards the venting block 5.

[0027] refer to Figure 3 and Figure 4 The first wall 61 and the second wall 62 of the slow-flow section 6 are opened along the direction of fluid flow. In this embodiment, the first wall 61 and the second wall 62 are preferably planes that are easy to process. Both the first wall 61 and the second wall 62 can make the fluid flow along the wall, increasing the contact area between the fluid and the wall, thereby reducing the flow rate of the fluid.

[0028] Since the deceleration effect of a single flow-retarding section 6 is relatively limited, in order to improve the energy loss effect of flow-retarding section 6 on the fluid, refer to Figure 3 In this embodiment, multiple flow-retarding sections 6 are preferably provided in each overflow channel 4. To facilitate arrangement on the moving mold 2, adjacent flow-retarding sections 6 are staggered on both sides of the overflow channel 4. After the fluid collides with the first wall 61 and the second wall 62 of the multiple flow-retarding sections 6, its energy is rapidly dissipated, thus reducing its speed. Furthermore, each flow-retarding section 6 can be arranged in various ways, as long as it allows the fluid to return to the overflow channel 4 after flowing out. For example, it can include a left-shifting section 64, a straight section 64, and a right-shifting section, and the angle of the shift can be arbitrarily designed. In this application, the flow-retarding section 6 is designed as a regular rising section 63, a straight section 64, and a falling section 65.

[0029] refer to Figure 2 The overflow channels 4 are symmetrically arranged on the moving mold 2. An overflow groove 7 is provided between the overflow channels 4 and the mold cavity 3. The gas in the mold cavity 3 is first quickly led out by each overflow groove 7. The symmetrical arrangement of the overflow channels 4 allows the gas in the mold cavity 3 to enter different overflow channels 4 for discharge, thus improving the venting effect.

[0030] In addition, after the fluid is slowed down by overflow channel 4 and slow-flow section 6, it eventually enters exhaust block 5. Exhaust block 5 can further slow down the fluid. (Refer to...) Figure 5 Each venting block 5 includes a first venting block 51 and a second venting block 52 arranged vertically. The gap between the first venting block 51 and the second venting block 52 forms a venting groove 55. Furthermore, the venting groove 55 can be designed in various forms, such as a straight gap. In this embodiment, it is preferable to have protrusions 53 and grooves 54 formed on the opposite surfaces of the first venting block 51 and the second venting block 52, thereby increasing the venting area of ​​the venting groove 55, which is more conducive to gas discharge, reduces the occurrence of air holes on the product, and improves the yield. The width W of the venting groove 55 is 0.6mm to 1.2mm. The main reason is that when the width of the venting groove 55 is less than 0.6mm, the gap is too small and the molten metal will block the venting groove 55 due to rapid cooling during the flow, thus affecting the venting effect; when the width of the venting groove 55 is greater than 1.2mm, the gap is too large and the deceleration effect of the molten metal during the flow is poor, resulting in splashing from the venting block 5. In this embodiment, the preferred width W of the venting groove 55 is 0.8mm.

Claims

1. A die-casting die comprising: a die including a fixed die (1) and a movable die (2) located below the fixed die (1), the die cavity (3) of the fixed die (1) and the movable die (2) being capable of molding a molded product by injecting a molten material in a combined state; an overflow channel (4) provided in at least one of the fixed die (1) and the movable die (2) in a manner that communicates with the die cavity (3) by means of an overflow gate, for discharging a fluid, including a previously molten metal and a gas, pressed in the die cavity (3); an exhaust block (5) provided at the end of the overflow channel (4); characterized in that the overflow channel (4) is partially provided with a flow-reducing section (6) for reducing the flow speed of the fluid in the flow direction of the fluid, the flow-reducing section (6) is provided with a first wall surface (61) for forcing the fluid to flow in a predetermined offset direction and a second wall surface (62) for causing the fluid to flow back to the overflow channel (4) in the predetermined offset direction, thereby causing the fluid to flow toward the exhaust block (5).

2. The die casting mold according to claim 1, characterized in that: The first wall surface (61) and / or the second wall surface (62) are wall surfaces having a flat or curved shape.

3. The die casting mold according to claim 2, characterized in that: A plurality of flow-reducing sections (6) are provided, adjacent one or more flow-reducing sections (6) are provided in the same direction with a gap therebetween or are provided on both sides of the overflow channel (4) in a staggered manner.

4. The die casting mold according to claim 3, characterized in that: The flow-reducing section (6) includes a flat section (64), an ascending section (63) provided on one side of the flat section (64), and a descending section (65) provided on the other side, the directions of the ascending section (63) and the descending section (65) are based on the up-and-down direction of the opening of the fixed die (1) and the movable die (2).

5. The die casting mold according to claim 4, characterized in that: The overflow channel (4) is symmetrically provided on the movable die (2), and an overflow groove (7) is provided between the overflow channel (4) and the die cavity (3).

6. The die casting mold according to any one of claims 1 to 5, characterized in that: Each of the exhaust blocks (5) includes a first exhaust block (51) and a second exhaust block (52) provided in an up-and-down direction, and a gap between the first exhaust block (51) and the second exhaust block (52) forms an exhaust groove (55).

7. The die casting mold according to claim 6, characterized in that: Protrusions (53) and recesses (54) are provided on the opposite surfaces of the first exhaust block (51) and the second exhaust block (52) with a gap therebetween, and the gap reserved after the protrusions (53) and the recesses (54) are fitted forms the exhaust groove (55).

8. The die casting mold according to claim 7, characterized in that: The width W of the exhaust groove (55) is 0.6 to 1.2 mm.

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