Disc die casting product die

Abstract

The invention discloses a disc die casting product die, which belongs to the technical field of casting molding and comprises a die cavity, a material cake is arranged on one side of the die cavity, a middle main runner is arranged in the middle of the material cake, and the middle main runner is arranged in the middle of the bottom of the die cavity. A first fan-shaped sprue is arranged at the end, close to the mold cavity, of the middle main runner, side edge main runners are arranged on the left side and the right side of the middle main runner, a plurality of branch runners are arranged on the side edge main runners, and a conical tangent sprue is arranged at the end, close to the mold cavity, of the branch runner located at the farthest end. Second fan-shaped sprues are arranged at the ends, close to the mold cavity, of the other branch runners; and a cinder ladle is arranged on the other side of the mold cavity. According to the pouring gate system, a mold cavity can be evenly filled with liquid aluminum alloy according to the assumed sequence, air in the mold cavity is firstly expelled out, and no air hole exists in a casting product after die-casting forming; and a cinder ladle connecting mode is adopted, so that casting products and cinder ladles can be ejected simultaneously.

Description

Technical Field

[0001] The invention relates to the technical field of casting and molding, in particular to a disc die-casting product mold. Background Art

[0002] Aluminum alloy disc parts are greatly affected by the design of the runner and the position of the gate. Especially when the disc parts adopt the side gate, the design flow direction of the runner and the gate method, i.e. angle / size / shape, all affect the quality of the die-casting products. Disc-type die-casting castings often have multiple pores inside after the product is formed.

[0003] like Figure 8 As shown in FIG. 1 , a typical conventional mold design scheme in the prior art is shown. This conventional mold design scheme will directly lead to internal defects in the casting product. Fig. 9 As shown in the figure, mold flow analysis shows that the liquid aluminum alloy of the two runners facing the product first flows into the mold cavity, and one side has quickly rushed to the end of the mold cavity. The ring in the middle of the casting product is the sleeve part of the product, which needs to be high-density, without pores or looseness. However, the current design cannot guarantee the product quality of the sleeve; at the same time, the liquid flowing into the mold cavity from other gates on the side will form cold flow and air entrainment with the first flowing part, resulting in a large number of pore defects inside the product. Summary of the invention

[0004] The purpose of the present invention is to provide a disc die-casting product mold to solve the problem that the liquid aluminum alloy of the two flow channels of the main flow channels of the existing mold facing the product first flows into the mold cavity, and one side has quickly rushed to the end of the mold cavity, which cannot guarantee the product quality of the sleeve. The liquid flowing into the mold cavity from other gates on the side will form cold flow and air entrainment with the first flowing part, resulting in a large number of pore defects inside the product.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a disc die casting product mold, comprising a mold cavity, wherein a material cake is arranged on one side of the mold cavity;

[0007] An intermediate main channel is arranged in the middle of the material cake, and the intermediate main channel is arranged in the middle position of the bottom of the mold cavity. A first fan-shaped gate is arranged on one end of the intermediate main channel close to the mold cavity, and side main channels are arranged on the left and right sides of the intermediate main channel. A plurality of branch channels are arranged on the side main channel, and a conical tangent gate is arranged on one end of the branch channel located at the farthest end close to the mold cavity, and a second fan-shaped gate is arranged on one end of the remaining branch channels close to the mold cavity.

[0008] Furthermore, the distance between the cake outlet and the edge of the mold cavity is equal to the distance from the edge of the mold cavity to the core sleeve.

[0009] Furthermore, the cross-sectional area of ​​the side main flow channel decreases from one end close to the material cake to the outside.

[0010] Furthermore, the portion where the cross section of the side main flow channel decreases is a step structure, and the connection between each branch flow channel and the side main flow channel is located upstream of the step structure.

[0011] Furthermore, the first fan-shaped gate, a plurality of the second fan-shaped gates and the two tapered tangent gates are distributed in a fan-shaped area of ​​180 degrees.

[0012] Furthermore, the first fan gate points to the central axis point of the core of the mold cavity, the second fan gate points to the central part of the mold cavity at an angle of 45°, the tapered tangent gate is perpendicular to the side, and the liquid alloy flowing through the tapered tangent gate flows at an angle of 45° in the mold cavity.

[0013] Furthermore, the thickness of the first fan-shaped gate is 2 to 4 mm greater than the thickness of the second fan-shaped gate or the tapered tangent gate.

[0014] Furthermore, the mold cavity is provided with a slag bag on a side away from the material cake.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] The present invention can make the air in the flow channel driven out ahead of the front end of the flow of the liquid aluminum alloy when the liquid aluminum alloy flows through the designed flow channel, so that the air existing in the flow channel part enters the mold cavity first; when filling the mold cavity, the gate system can make the liquid aluminum alloy evenly fill the mold cavity according to the expected order, and drive out the air in the mold cavity first, so as to avoid the phenomenon that the aluminum alloy liquid in the mold cavity wraps the cavity air, and then no pores are formed and exist inside the casting product after die-casting; the connection slag bag mode is adopted, which is more conducive to the simultaneous ejection of the casting product and the slag bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a structural schematic diagram of the mold of the disc die casting product of the present invention;

[0019] Figure 2 The aluminum alloy filling sequence of the present invention is Figure 1 ;

[0020] Figure 3 The aluminum alloy filling sequence of the present invention is Figure 2 ;

[0021] Figure 4 The aluminum alloy filling sequence of the present invention is Figure 3 ;

[0022] Figure 5 The aluminum alloy filling sequence of the present invention is Figure 4 ;

[0023] Figure 6 The aluminum alloy filling sequence of the present invention is Figure 5 ;

[0024] Figure 7 The aluminum alloy filling sequence of the present invention is Figure 6 ;

[0025] Figure 8 It is a schematic diagram of the mold structure in the prior art;

[0026] Fig. 9 The aluminum alloy filling sequence in the prior art is Figure 1 .

[0027] Explanation of the accompanying drawings: 1. mold cavity; 2. material cake; 3. middle main channel; 4. side main channel; 4-1. step structure; 5. branch channel; 6. first fan-shaped gate; 7. second fan-shaped gate; 8. tapered tangent gate; 9. slag bag. DETAILED DESCRIPTION

[0028] like Figure 1-7 As shown, a disc die casting product mold comprises a mold cavity 1, a material cake 2 is arranged on one side of the mold cavity 1, the material cake 2 plays a pressurizing role to compact the product, and a slag bag 9 is arranged on the side of the mold cavity 1 away from the material cake 2;

[0029] The middle part of the material cake 2 is connected to an intermediate main channel 3, and the intermediate main channel 3 is arranged in the middle position of the bottom of the mold cavity 1. The end of the intermediate main channel 3 close to the mold cavity 1 is connected to a first fan-shaped gate 6, and side main channels 4 are symmetrically arranged on the left and right sides of the intermediate main channel 3. The side main channels 4 are connected to a plurality of branch channels 5, and the end of the branch channel 5 located at the farthest end close to the mold cavity 1 is connected to a conical tangent gate 8, and the ends of the remaining branch channels 5 close to the mold cavity 1 are connected to second fan-shaped gates 7; a slag bag 9 is arranged on the other side of the mold cavity 1.

[0030] The distance between the outlet of the cake 2 and the edge of the mold cavity 1 is equal to the distance from the edge of the mold cavity 1 to the core sleeve; if there is no sleeve, the distance is calculated according to the center point, that is, the distance between the outlet of the cake 2 and the edge of the mold cavity 1 is equal to the distance from the edge of the mold cavity 1 to the center point of the mold cavity 1.

[0031] When designing the flow channel, the cross-sectional area of ​​the side main flow channel 4 decreases from one end close to the material cake 2 to the outside, and the cross-sectional area of ​​the side main flow channel 4 decreases at a step structure 4-1. The connection between each branch flow channel 5 and the side main flow channel 4 is located upstream of the step structure 4-1; the side main flow channel 4 is set to a step shape, and each step is connected to a branch flow channel 5, so that the liquid metal can flow smoothly into the branch flow channel 5, and at the same time, part of the metal continues to flow in the side main flow channel 4, so that the air in the flow channel will be pushed to the front end of the liquid surface by the liquid metal; the side main flow channel 4 is designed with a step at each branch flow channel 5, so that the liquid on the side main flow channel 4 has resistance, so that the liquid aluminum alloy can flow into the branch flow channel 5.

[0032] The first fan-shaped gate 6, the plurality of the second fan-shaped gates 7 and the two tapered tangent gates 8 are distributed in a 180-degree fan-shaped area; that is, when designing a gate on the side of the product, the gate needs to be arranged at half of the center line of the disc product; that is, half of the side edge of the disc product needs to have a gate distribution.

[0033] The first fan-shaped gate 6 points to the central axis point of the core of the mold cavity 1, the second fan-shaped gate 7 points to the central part of the mold cavity 1 at an angle of 45°, and the tapered tangent gate 8 is perpendicular to the side, and the liquid alloy flowing through the tapered tangent gate 8 flows at an angle of 45° in the mold cavity 1; the connection between the tapered tangent gate 8 and the mold cavity 1 is called the inlet, and when the area of ​​the tapered tangent gate 8 is equal to the area at the inlet, the liquid alloy enters the mold cavity at an angle of 45°; the overall arrangement of the gates can make the aluminum alloy liquid have enough impact force inside the mold cavity to flow to the core sleeve of the product, so that the sleeve can be filled better.

[0034] The thickness of the first fan-shaped gate 6 is 2 to 4 mm greater than the thickness of the second fan-shaped gate 7 or the tapered tangent gate 8 .

[0035] In this embodiment, an aluminum alloy die-casting heat sink component product is taken as an example for explanation. The average wall thickness of the product is 5 to 8.6 mm, the square column part is 15 mm high, and the thin-walled part of the heat sink is only 1.8 mm thick.

[0036] The weight of this product is 1465 grams and the volume is 543 cubic centimeters. According to the existing equipment with a clamping force of 800 tons, a fast injection speed of 3 meters per second, and a punch diameter of 90 milliseconds, it is calculated that when the gate speed is 40 meters per second, the gate area is 488 square millimeters; the gate length is 252 millimeters, and the average gate thickness is: 488 / 252=1.9 millimeters; filling time = casting volume / total flow of the gate: 35 milliseconds.

[0037] In order to ensure that the middle main flow channel 3 facing the product can allow the liquid aluminum alloy to enter the mold cavity 1 first, the thickness of the first fan-shaped gate 6 is increased to 2.1 mm, and the thickness of most other gates is still 1.9 mm.

[0038] The thickness of the middle main channel 3 is 2.1 mm, the thickness of the second fan gate 7 is 1.9 mm, 1.9 mm, and 1.9 mm from the outside of the middle phase, and the thickness of the last fan gate on the left is reduced to 1.7 mm, limiting its flow rate.

[0039] The gate on the left has a slightly smaller gate size than the gate on the right because the corresponding casting product space is relatively large.

[0040] The slag bag 9 is connected to the exhaust, which makes it easier to eject synchronously with the casting product. The length of the slag bag connection is 70 mm, there are three in total, and the step thickness is 0.8 mm. The thickest part of the slag bag is 3.2 mm and the width is 10 mm; the total area of ​​the slag bag inlet is more than 1 / 3 of the total area of ​​the gate; in this way, it can ensure that the air in the mold cavity is smoothly discharged from the mold cavity at the moment of aluminum alloy liquid filling. At present, the existing slag bags are generally discrete slag bags, and the slag bags may fall off the casting during ejection; the slag bag 9 in this embodiment connects the outer sides of multiple small slag bags together. This structure can prevent the slag bag from falling off the casting during ejection.

[0041] like Figure 2-7 As shown, according to the mold flow analysis, according to this design scheme, the air in the mold cavity can be evenly driven out at the front end of the aluminum alloy, so that there will not be any residual air inside the casting product.

[0042] According to the flow channel and gate scheme designed by the present invention, the aluminum alloy liquid first enters the mold cavity 1 from the first fan-shaped gate 6 facing the mold cavity; then, the aluminum alloy liquid enters the mold cavity 1 through the second fan-shaped gate 7 on the side; the aluminum alloy liquid flowing to the conical tangent gate 8 on the two distal sides finally enters the mold cavity 1 due to the resistance of its gate and the lengthening of the flow channel. When entering the cavity, it just merges with the liquid metal flowing in from other gates. At the semi-circular center of the product, the air is driven out of the front end of the liquid aluminum alloy, achieving the pre-designed effect. The role of the slag bag is to fill the loose part of the mixture of air and liquid aluminum alloy, making the product very dense.

[0043] All similar disc products of die-cast aluminum alloy can adopt this kind of design scheme to achieve the density of die-cast products. The gate position should be distributed over half of the disc, with the central gate as the boundary, symmetrical on both sides; the thickness of the central gate should be 2-4 mm higher than other gates, depending on the specific shape of the product. In this way, the aluminum alloy liquid in the central gate can be guaranteed to fill the mold cavity first, and the aluminum alloy of the two gates in the middle part of the side disc that enters the mold cavity at last should just meet with other aluminum alloy liquid flowing inside the mold and push the air at the front of the liquid surface, and finally push the bad aluminum alloy and air mixture into the slag bag.

[0044] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A disc die casting product mold, characterized in that: It comprises a mold cavity (1), and a material cake (2) is arranged on one side of the mold cavity (1); A middle main flow channel (3) is arranged in the middle of the material cake (2), and the middle main flow channel (3) is arranged in the middle position of the bottom of the mold cavity (1). A first fan-shaped gate (6) is arranged on one end of the middle main flow channel (3) close to the mold cavity (1). Side main flow channels (4) are arranged on the left and right sides of the middle main flow channel (3), and a plurality of branch flow channels (5) are arranged on the side main flow channel (4). A conical tangent gate (8) is arranged on one end of the branch flow channel (5) located at the farthest end close to the mold cavity (1), and a second fan-shaped gate (7) is arranged on one end of the remaining branch flow channels (5) close to the mold cavity (1).

2. The disc die casting product mold according to claim 1, characterized in that: The distance between the outlet of the material cake (2) and the edge of the mold cavity (1) is equal to the distance from the edge of the mold cavity (1) to the core sleeve.

3. The disc die casting product mold according to claim 1, characterized in that: The cross-sectional area of ​​the side main flow channel (4) decreases from one end close to the material cake (2) toward the outside.

4. The disc die casting product mold according to claim 3, characterized in that: The portion where the cross section of the side main channel (4) decreases is a step structure (4-1), and the connection between each branch channel (5) and the side main channel (4) is located upstream of the step structure (4-1).

5. The disc die casting product mold according to claim 1, characterized in that: The first fan-shaped gate (6), a plurality of the second fan-shaped gates (7) and the two tapered tangent gates (8) are distributed in a fan-shaped area of ​​180 degrees.

6. The disc die casting product mold according to claim 5, characterized in that: The first fan-shaped gate (6) points to the central axis point of the core of the mold cavity (1), the second fan-shaped gate (7) points to the central part of the mold cavity (1) at an angle of 45°, the tapered tangent gate (8) is oriented perpendicular to the side, and the liquid alloy flowing through the tapered tangent gate (8) in the mold cavity (1) flows at an angle of 45°.

7. The disc die casting product mold according to claim 5, characterized in that: The thickness of the first fan-shaped gate (6) is 2 to 4 mm greater than the thickness of the second fan-shaped gate (7) or the tapered tangent gate (8).

8. The disc die casting product mold according to claim 1, characterized in that: The mold cavity (1) is provided with a slag bag (9) on a side away from the material cake (2).

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