Die structure for preventing cold shut

Abstract

The utility model discloses a mould structure for preventing generation of cold shut, which comprises an upper mould core, a lower mould core, an insert and a water cooling needle, the upper mould core and the lower mould core are combined to form a product cavity after being covered, the upper mould core is provided with an assembly area, the insert is arranged in the assembly area and comprises a block body, and the lower end of the block body extends to be provided with a characteristic part. The feature part is used for forming a product deep cavity structure; the side surface of the block body is concavely provided with a vertically-through exhaust groove, the exhaust groove and the inner wall of the assembly area form an exhaust channel, the upper end of the exhaust channel is connected with an exhaust pipeline, the upper surface of the block body is concavely provided with a cooling pipeline, the cooling pipeline extends to the feature part, and the water-cooling needle is inserted into the cooling pipeline. The insert is installed on the upper mold core to form a product deep cavity structure, the exhaust groove is formed in the insert, an exhaust channel is formed by the exhaust groove and the inner wall of the assembly area, molten aluminum is promoted to rapidly enter a vertical face, meanwhile, gas in the cavity is promoted to be exhausted, and gas entrapment is avoided.

Description

Technical Field

[0001] The utility model relates to the field of die casting molds, in particular to a mold structure for preventing cold shut from occurring. Background Art

[0002] The welding parts (deep cavity structure) of the die-cast aluminum alloy bracket used for welding have the following risks: Risk 1: The die-casting process is a high-speed and high-pressure metal liquid filling process. The gas inside the cavity cannot be completely discharged, and pores are formed inside the product, which needs to be improved by increasing the exhaust. Risk 2: Its welding position is the end of the product filling. The temperature of the aluminum liquid drops during the filling process, which is easy to form a cold shut, and the mold temperature needs to be increased to improve it. Risk 3: The wall thickness of the local area is relatively thick, which is prone to shrinkage defects such as shrinkage cavities and shrinkage, and requires cooling water. The above casting defects can easily lead to unqualified product porosity. The porosity control of the welding area of ​​such products has always plagued the die-casting industry. Utility Model Content

[0003] In view of the defects of the above-mentioned prior art, the main purpose of the utility model is to overcome the shortcomings of the prior art and discloses a mold structure for preventing cold shut, including an upper mold core, a lower mold core, an insert and a water-cooling needle. The upper mold core and the lower mold core are combined to form a product cavity after being covered. The upper mold core is provided with an assembly area, and the insert is installed in the assembly area. The insert includes a block body, and a feature portion is extended from the lower end of the block body, and the feature portion is used to form a deep cavity structure of the product; an exhaust groove is recessed on the side surface of the block body and runs through the upper and lower parts, and the exhaust groove and the inner wall of the assembly area form an exhaust channel, and the upper end of the exhaust channel is connected to the exhaust pipeline, and a cooling pipeline is recessed on the upper surface of the block body, and the cooling pipeline extends to the feature portion, and the water-cooling needle is inserted into the cooling pipeline.

[0004] Furthermore, a heat-insulating groove is arranged outwardly along the cooling pipe path, and the heat-insulating groove is located at a relative position where a cold shut-off is likely to occur in the product.

[0005] Furthermore, the depth of the thermal insulation groove is set to 1±0.1 mm.

[0006] Furthermore, the water-cooling needle includes an inner tube, an outer tube and two quick connectors, the outer tube is sleeved outside the inner tube, the two quick connectors are respectively installed on the inner tube and the outer tube, the inner tube is axially provided with a liquid inlet cavity, and a liquid return cavity is formed between the inner tube and the outer tube; the cooling water enters the liquid inlet cavity from one of the quick connectors, and then passes through the liquid return cavity and is discharged from the other quick connector.

[0007] Furthermore, three exhaust grooves are arranged at intervals on each of the two opposite sides of the insert, and the exhaust grooves are 3 mm wide and 0.05 mm thick.

[0008] Beneficial effects achieved by the utility model:

[0009] The utility model installs inserts on the upper mold core to form a deep cavity structure of the product, and sets exhaust grooves on the inserts to form exhaust channels with the inner wall of the assembly area, which promotes the rapid entry of aluminum liquid into the facade and the exhaust of gas in the cavity to avoid air roll-up. A heat insulation groove is set in the cooling channel in the insert to form an air heat insulation area between the insert and the water cooling needle, which reduces the heat transfer in the area, thereby reducing the heat loss in the area prone to cold shut, effectively avoiding the occurrence of cold shut, and fully cooling the thick wall area, so that the risk of shrinkage is small, thereby ensuring the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A three-dimensional structural schematic diagram of a mold structure for preventing cold shut according to the utility model;

[0011] Figure 2 for Figure 1 Structural diagram of the hidden upper mold core;

[0012] Figure 3 is a schematic diagram of the structure of the insert;

[0013] Figure 4 for Figure 3 A magnified view of middle;

[0014] Figure 5 It is a schematic diagram of the structure of the insert and the water-cooling needle;

[0015] Figure 6 for Figure 5 Enlarged view of middle B;

[0016] The reference numerals are as follows:

[0017] 1. Upper mold core, 2. Lower mold core, 3. Insert, 4. Exhaust pipeline, 5. Water-cooling needle, 31. Block body, 32. Feature part, 33. Exhaust groove, 34. Cooling pipeline, 51. Inner tube, 52. Outer tube, 53. Quick connector, 54. Liquid inlet cavity, 55. Liquid return cavity, 341. Insulation groove. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] A mold structure that prevents cold shut, such as Figure 1-Figure 6As shown, it includes an upper mold core 1, a lower mold core 2, an insert 3 and a water-cooling needle 5. The surfaces of the upper mold core 1 and the lower mold core 2 are both concavely provided with cavities that match the product features. After the upper mold core 1 and the lower mold core 2 are covered together, the cavities of the two are combined to form the mold cavity of the product. An assembly area is set on the upper mold core 1 for installing the insert 3. Among them, the insert 3 includes a block body 31, and a feature portion 32 is extended from the lower end of the block body 31. The feature portion 32 is used to form a deep cavity structure of the product. The side wall surface of the block body 31 is concavely provided with an exhaust groove 33 that passes through from top to bottom. The exhaust groove and the inner wall of the assembly cavity form an exhaust channel. The upper end of the exhaust channel is connected to the exhaust pipeline 4, and the exhaust pipeline 4 is connected to the vacuum machine. The cavity is continuously vacuumed through the exhaust channel, and the gas in the deep cavity can be completely removed to prevent air entrainment and reduce the gradual porosity; at the same time, it promotes the filling of aluminum liquid. In addition, the exhaust groove 33 uses the inner wall of the assembly cavity to form an exhaust channel, which is convenient for the processing of the exhaust channel. A cooling pipeline 34 is recessed on the upper surface of the block body 31 , and the cooling pipeline extends to the characteristic portion 32 . The water-cooling needle 5 is inserted into the cooling channel 34 , and the water-cooling needle 5 cools the aluminum liquid through heat transfer from the insert 3 .

[0020] In this embodiment, if Figure 1-Figure 6 As shown, by setting an exhaust groove 33 on the side wall of the insert and continuously drawing vacuum during the vacuum period, the aluminum liquid is promoted to reach the vertical surface of the product, and all other liquids can be discharged to prevent air from rolling and avoid cold shut at the end of the inner vertical surface. A water cooling needle is set in the insert 3 to cool the thick wall, thereby ensuring product quality.

[0021] In one embodiment, if Figure 1-Figure 6 As shown, the cooling pipeline 34 is provided with a heat insulation groove 341 radially outward, and the heat insulation groove 341 is located at a relative position where the product is prone to cold shut. In this embodiment, the upper end of the facade is located at the horizontal extension of the upper end of the product because the aluminum liquid arrives late and the wall is thin; therefore, the heat insulation groove 341 is located at the horizontal extension of the upper end of the product; through the heat insulation groove 341, an air heat insulation area is formed between the insert 3 and the water-cooling needle 5. After the cold water enters the water-cooling needle, the air heat transfer is lower than that of the solid, which can slow down the cooling speed of the upper end of the product facade, and the heat loss in the area prone to cold shut is small, thereby effectively avoiding the occurrence of cold shut, and the heat transfer is directly carried out through the insert 2 below to fully cool the thick wall area, with a small risk of shrinkage, no rapid cooling phenomenon, and greatly reduced risk of cold shut of the casting.

[0022] In the above embodiment, if Figure 1-Figure 6 As shown, the depth of the heat insulation groove 341 is set to 1±0.1 mm.

[0023] In one embodiment, if Figure 1-Figure 6As shown, the water-cooling needle 5 includes an inner tube 51, an outer tube 52 and two quick connectors 53. The outer tube 52 is sleeved outside the inner tube 51. The two quick connectors 53 are respectively installed on the inner tube 51 and the outer tube 52. The inner tube 51 is axially provided with a liquid inlet cavity 54, and a liquid return cavity 55 is formed between the inner tube 51 and the outer tube 52. The cooling water enters the liquid inlet cavity 54 from a quick connector, and then passes through the liquid return cavity 55 and is discharged from the other quick connector.

[0024] In one embodiment, if Figure 1-Figure 6 As shown, three exhaust grooves 33 are arranged at intervals on each side of the opposite sides of the insert 3, and the width W of the exhaust groove 33 is 3 mm and the thickness T is 0.05 mm, so as to improve the exhaust efficiency and prevent the aluminum liquid from overflowing.

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced by equivalents without departing from the spirit and scope of the present invention, they should be included in the scope of protection of the claims of the present invention.

Claims

1. A mold structure for preventing cold shut, characterized in that: It includes an upper mold core, a lower mold core, an insert and a water-cooling needle. The upper mold core and the lower mold core are combined to form a product cavity after being covered. The upper mold core is provided with an assembly area, and the insert is installed in the assembly area. The insert includes a block body, and a feature portion is extended from the lower end of the block body, and the feature portion is used to form a deep cavity structure of the product; an exhaust groove is recessed on the side surface of the block body and runs through the upper and lower parts, and the exhaust groove and the inner wall of the assembly area form an exhaust channel, and the upper end of the exhaust channel is connected to an exhaust pipeline, and a cooling pipeline is recessed on the upper surface of the block body, and the cooling pipeline extends to the feature portion, and the water-cooling needle is inserted into the cooling pipeline.

2. A mold structure for preventing cold shut according to claim 1, characterized in that: The cooling pipe path is provided with a heat insulation groove outwardly, and the heat insulation groove is located at a relative position where the product is prone to cold insulation.

3. A mold structure for preventing cold shut according to claim 2, characterized in that: The depth of the heat insulation groove is set to 1±0.1 mm.

4. A mold structure for preventing cold shut according to claim 1, characterized in that: The water-cooling needle includes an inner tube, an outer tube and two quick connectors. The outer tube is sleeved outside the inner tube. The two quick connectors are respectively installed on the inner tube and the outer tube. A liquid inlet cavity is axially arranged on the inner tube, and a liquid return cavity is formed between the inner tube and the outer tube. Cooling water enters the liquid inlet cavity from one of the quick connectors, and then is discharged from the other quick connector through the liquid return cavity.

5. The mold structure for preventing cold shut according to claim 1, characterized in that: Three exhaust grooves are arranged at intervals on each of the two opposite sides of the insert, and the exhaust grooves are 3 mm wide and 0.05 mm thick.

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