Lower die fixing structure of aluminum alloy hub low-pressure casting die

Abstract

The utility model relates to a lower die fixing structure of an aluminum alloy hub low-pressure casting die, which comprises a lower die and a lower die plate, a middle ring is welded in the center of the bottom surface of the lower die, three first internal thread mounting holes are uniformly distributed in the bottom surface of the middle ring, a stepped hole is formed in the center of the lower die plate, and a cover plate is sleeved in the large-diameter end of the stepped hole. The lower portion of the middle ring is inserted into the small-diameter end of the stepped hole in a sleeved mode and abuts against the cover plate, a first counterbore is formed in the portion, corresponding to the first internal thread mounting hole, of the cover plate and fixedly connected with the first internal thread mounting hole through a first countersunk bolt, and three second counterbores are formed in the edge of the cover plate and fixedly connected with the first internal thread mounting hole through a second countersunk bolt. Second internal thread mounting holes are formed in the positions, corresponding to the second counterbores, of the bottom face of the lower die plate, and the second counterbores are fixedly connected with the second internal thread mounting holes through second countersunk bolts. Connection between the lower die and the lower die plate is achieved through welding of the middle ring and the lower die, bolting of the middle ring and the cover plate and bolting of the cover plate and the lower die plate, disassembly and assembly are easy, front distance deformation and aluminum leakage can be effectively prevented, and convenience and practicability are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheel hub casting, and in particular relates to a lower mold fixing structure of a low-pressure casting mold for an aluminum alloy wheel hub. Background Art

[0002] At present, in the low-pressure casting process of aluminum alloy wheels, the molds used are mostly composed of upper molds, side molds, lower molds and other structures. In practical applications, since the molten aluminum enters the lower mold from the riser, the temperature in the center of the lower mold is the highest. Under the deformation caused by thermal expansion and contraction, the center of the lower mold will be raised, resulting in the problem of front distance deformation. After the lower mold is raised, the problem of molten aluminum overflowing is very likely to occur when the matching surface between the lower mold and the lower mold plate is too short. Therefore, it is necessary to clean the corresponding machine after the casting is completed and the mold is removed from the machine, which is time-consuming and laborious. Therefore, it is necessary to effectively control the problem of front distance deformation of the lower mold. At present, the existing methods for controlling the deformation of the front distance mainly include changing the material of the lower mold, fixing the riser with small screws, lowering the height of the lower mold and fixing it with bolts in the middle part. Changing the material of the lower mold requires re-formulating the mold manufacturing process, which will increase the price of the mold and is not economical and practical. Although the small screw fixing method is practical, it is easy to be damaged during disassembly and assembly, and the lower mold needs to be extended, resulting in an increase in the number of blanks required for the production of the lower mold, increased costs, and long processing time. Although the method of lowering the height and adding bolts can play a certain role in preventing the deformation of the front distance, it still has certain aluminum leakage problems, and once aluminum leakage occurs, it is the most difficult to clean, which needs to be improved. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a lower mold fixing structure for a low-pressure casting mold for an aluminum alloy wheel hub, which solves the above problems by welding an additional intermediate ring to the lower mold, bolting the intermediate ring to the cover plate, and bolting the cover plate to the lower mold plate to achieve the connection between the lower mold and the lower mold plate.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a lower mold fixing structure of an aluminum alloy wheel hub low-pressure casting mold, comprising a lower mold and a lower mold plate, the edge of the bottom surface of the lower mold abuts the edge of the top surface of the lower mold plate, an intermediate ring is welded at the center of the bottom surface of the lower mold, and the bottom surface of the intermediate ring is uniformly provided with three first internal thread mounting holes at circumferential intervals, a stepped hole with an inverted T-shaped longitudinal section is penetrated through the center of the lower mold plate, a cover plate is sleeved in the large diameter end of the stepped hole, the lower part of the intermediate ring is inserted into the small diameter end of the stepped hole and abuts against the cover plate, a first countersunk hole is penetrated through the cover plate corresponding to the first internal thread mounting hole, the first countersunk hole is fixedly connected to the corresponding first internal thread mounting hole by a first countersunk bolt, three second countersunk holes uniformly distributed at circumferential intervals are opened on the edge of the cover plate, a second internal thread mounting hole is opened on the bottom surface of the lower mold plate corresponding to the second countersunk hole, and the second countersunk hole is fixedly connected to the corresponding second internal thread mounting hole by a second countersunk bolt.

[0005] Preferably, an annular upper notch is provided on the inner and outer sides of the center of the bottom surface of the lower mold, and an annular lower notch is provided on the inner and outer sides of the top surface of the intermediate ring. The upper notch is connected to the lower notch on the same side by surfacing welding, so that the connection between the lower mold and the intermediate ring forms a welding part with an H-shaped longitudinal section.

[0006] Preferably, the intermediate ring is made of No. 45 steel.

[0007] Preferably, the first countersunk hole is matched with the corresponding first internal thread mounting hole and both are matched with the first countersunk bolt.

[0008] Preferably, the second countersunk hole is staggered with the first countersunk hole, the second countersunk hole is matched with the corresponding second internal thread mounting hole, and both are matched with the second countersunk bolt.

[0009] Preferably, the first countersunk bolt and the second countersunk bolt are both M12 bolts.

[0010] The beneficial effects of the utility model are as follows: by adding an intermediate ring, the lower die blank can be effectively reduced, the manufacturing cost and processing time of the lower die can be reduced, and the connection between the lower die and the lower die plate can be realized by welding the additional intermediate ring to the lower die, bolting the intermediate ring to the cover plate, and bolting the cover plate to the lower die plate. On the one hand, the contact area can be effectively increased, and the matching vertical surface of the lower die and the intermediate ring can be extended. In addition, the lower die and the cover plate can be firmly fastened to the intermediate ring, which can effectively prevent the overflow of aluminum water and avoid large-area aluminum leakage. On the other hand, the middle part of the lower die is fixed by three groups of first countersunk bolts distributed circumferentially at an angle of 120 degrees, which is more stable and reliable, thereby It can effectively prevent serious deformation of the front distance, and because the lower die is fixed to the cover plate by the first countersunk bolt through the intermediate ring welded thereto, and the cover plate is fixed to the lower template by the second countersunk bolt, this is convenient for disassembly and assembly of the lower die, and avoids direct connection between the lower die and the lower template, so that each time the lower die is disassembled and assembled, only the first countersunk bolt needs to be disassembled and assembled. After frequent disassembly and assembly, if the first countersunk hole and / or the first internal threaded mounting hole are damaged, only the intermediate ring needs to be cut off and replaced, and the cover plate can be replaced by disassembling and assembling the second countersunk bolt, without scrapping the entire lower die and lower template, which is more economical and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a main structural schematic diagram of the utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the intermediate ring of the utility model when viewed from above;

[0013] Figure 3 It is a schematic diagram of the top view of the cover plate of the utility model;

[0014] Figure 4 It is a schematic diagram of the structure of the lower template of the utility model when viewed from above.

[0015] Numbers in the figure: 1 is the lower die, 2 is the lower template, 3 is the intermediate ring, 4 is the first internal thread mounting hole, 5 is the stepped hole, 6 is the cover plate, 7 is the first countersunk hole, 8 is the first countersunk bolt, 9 is the second countersunk hole, 10 is the second internal thread mounting hole, 11 is the second countersunk bolt, and 12 is the welding part. DETAILED DESCRIPTION

[0016] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0017] like Figures 1 to 4As shown, a lower mold fixing structure of a low-pressure casting mold for an aluminum alloy wheel hub includes a lower mold 1 and a lower mold plate 2, wherein the edge of the bottom surface of the lower mold 1 abuts against the edge of the top surface of the lower mold plate 2. An intermediate ring 3 is welded at the center of the bottom surface of the lower mold 1, and three first internal thread mounting holes 4 are evenly distributed at circumferential intervals on the bottom surface of the intermediate ring 3. A stepped hole 5 with an inverted T-shaped longitudinal section is penetrated through the center of the lower mold plate 2, and a cover plate 6 is sleeved inside the large diameter end of the stepped hole 5. The lower part of the intermediate ring 3 is inserted into the small diameter end of the stepped hole 5 and abuts against the cover plate 6. A first countersunk hole 7 is penetrated through the cover plate 6 corresponding to the first internal thread mounting hole 4, and the first countersunk hole 7 is fixedly connected to the corresponding first internal thread mounting hole 4 through a first countersunk bolt 8. Three second countersunk holes 9 are evenly spaced at circumferential intervals on the edge of the cover plate 6, and second internally threaded mounting holes 10 are formed on the bottom surface of the lower template 2 corresponding to the second countersunk holes 9. The second countersunk holes 9 are fixedly connected to the corresponding second internally threaded mounting holes 10 by second countersunk bolts 11;

[0018] By adding the intermediate ring 3, the lower die 1 blank can be effectively reduced, the manufacturing cost and processing time of the lower die 1 can be reduced, and the connection between the lower die 1 and the lower die plate 2 can be realized by welding the additional intermediate ring 3 to the lower die 1, bolting to the cover plate 6, and bolting the cover plate 6 to the lower die plate 2. On the one hand, the contact area can be effectively increased, and the matching vertical surface of the lower die 1 and the intermediate ring 3 can be extended. In addition, the lower die 1 and the cover plate 6 cooperate to firmly buckle the intermediate ring 3, which can effectively prevent the overflow of aluminum water and avoid large-area aluminum leakage. On the other hand, the middle part of the lower die 1 is fixed by three groups of first countersunk bolts 8 distributed circumferentially at an angle of 120 degrees, which is more stable and reliable, thereby effectively preventing the front distance from being severely damaged. The lower die 1 is fixed to the cover plate 6 by the first countersunk bolt 8 through the intermediate ring 3 welded thereto, and the cover plate 6 is fixed to the lower template 2 by the second countersunk bolt 11. This makes it easy to disassemble and assemble the lower die 1 and avoids the direct connection between the lower die 1 and the lower template 2. Each time the lower die 1 is disassembled and assembled, only the first countersunk bolt 8 needs to be disassembled and assembled. After frequent disassembly and assembly, if the first countersunk hole 7 and / or the first internal threaded mounting hole 4 are damaged, only the intermediate ring 3 needs to be cut off and replaced, and the cover plate 6 can be replaced by disassembling and assembling the second countersunk bolt 11. There is no need to scrap the entire lower die 1 and the lower template 2, which is more economical and practical.

[0019] In this embodiment, an annular upper notch is provided on the inner and outer sides of the bottom center of the lower mold 1, and an annular lower notch is provided on the inner and outer sides of the top surface of the intermediate ring 3. The upper notch is connected to the lower notch on the same side by surfacing welding, so that the connection between the lower mold 1 and the intermediate ring 3 forms a welding part 12 with an H-shaped longitudinal section, which can make the connection between the lower mold 1 and the intermediate ring 3 more stable, thereby more effectively cooperating to avoid aluminum leakage.

[0020] In this embodiment, the middle ring 3 is made of 45# steel to ensure its quality and service life.

[0021] In this embodiment, the first countersunk hole 7 is matched with the corresponding first internal thread mounting hole 4 and both are matched with the first countersunk bolt 8 to ensure smooth installation and fixation of the lower mold 1.

[0022] In this embodiment, the second countersunk hole 9 is staggered with the first countersunk hole 7 , and the second countersunk hole 9 is matched with the corresponding second internal threaded mounting hole 10 and both are matched with the second countersunk bolt 11 to ensure smooth installation and fixation of the cover plate 6 .

[0023] In this embodiment, the first countersunk bolt 8 and the second countersunk bolt 11 are both M12 bolts to ensure a stable connection.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lower mold fixing structure of a low-pressure casting mold for an aluminum alloy wheel hub, comprising a lower mold and a lower mold plate, characterized in that: The edge of the bottom surface of the lower mold is abutted with the edge of the top surface of the lower mold, and an intermediate ring is welded at the center of the bottom surface of the lower mold, and three first internally threaded mounting holes are evenly distributed at circumferential intervals on the bottom surface of the intermediate ring, and a stepped hole with an inverted T-shaped longitudinal section is penetrated through the center of the lower mold, and a cover plate is sleeved in the large diameter end of the stepped hole, and the lower part of the intermediate ring is inserted into the small diameter end of the stepped hole and abuts against the cover plate, and a first countersunk hole is penetrated through the cover plate corresponding to the first internally threaded mounting hole, and the first countersunk hole is fixedly connected to the corresponding first internally threaded mounting hole by a first countersunk bolt, and three second countersunk holes are evenly distributed at circumferential intervals on the edge of the cover plate, and a second internally threaded mounting hole is opened on the bottom surface of the lower mold corresponding to the second countersunk hole, and the second countersunk hole is fixedly connected to the corresponding second internally threaded mounting hole by a second countersunk bolt.

2. The lower mold fixing structure of the aluminum alloy wheel hub low-pressure casting mold according to claim 1 is characterized in that: An annular upper notch is provided on the inner and outer sides of the center of the bottom surface of the lower mold, and an annular lower notch is provided on the inner and outer sides of the top surface of the intermediate ring. The upper notch is connected to the lower notch on the same side by surfacing welding, so that the connection between the lower mold and the intermediate ring forms a welding part with an H-shaped longitudinal section.

3. The lower mold fixing structure of the aluminum alloy wheel hub low-pressure casting mold according to claim 1 is characterized in that: The material of the intermediate ring is 45# steel.

4. The lower mold fixing structure of the aluminum alloy wheel hub low-pressure casting mold according to claim 1 is characterized in that: The first countersunk hole is matched with the corresponding first internal thread mounting hole and both are matched with the first countersunk bolt.

5. The lower mold fixing structure of the aluminum alloy wheel hub low-pressure casting mold according to claim 1 is characterized in that: The second countersunk hole is staggered with the first countersunk hole, the second countersunk hole is matched with the corresponding second internal thread mounting hole, and both are matched with the second countersunk bolt.

6. The lower mold fixing structure of the aluminum alloy wheel hub low-pressure casting mold according to claim 1 is characterized in that: The first countersunk bolt and the second countersunk bolt are both M12 bolts.

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