Combined core-pulling die-casting die for aluminum alloy steering knuckle of dune buggy

Abstract

The utility model discloses a dune buggy aluminum alloy knuckle combined core-pulling die-casting die, and relates to the technical field of die-casting dies. Comprising an upper die and a lower die, wherein a cavity for accommodating aluminum alloy melt die casting is formed between the upper die and the lower die; the core pulling mechanism is arranged in the upper die or the lower die and used for pulling out a die core forming the knuckle brake caliper from the cavity in the die casting process; the cooling system assembly is distributed in the die and used for controlling the temperature of the die and guaranteeing the heat stability in the die casting process; the exhaust system assembly ensures that air in the die can be smoothly exhausted in the die casting process, and air holes are prevented from being generated. According to the die-casting die, a unique core pulling structure is adopted, the core pulling operation can be automatically completed in the die-casting process, manual intervention is reduced, and the production efficiency and the product quality are improved. And by combining and using multiple die cavities and multiple loose cores, the production period is greatly shortened, the utilization rate of a machine table is improved, and the die-casting production efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of die casting moulds, in particular to a combined core-pulling die casting mould for an aluminium alloy steering knuckle of a beach vehicle. Background Art

[0002] With the development of the automobile industry, the market has put forward higher requirements on the quality and production efficiency of ATV steering knuckles. In the production process of ATV aluminum alloy steering knuckles, due to its complex structure, a specially designed die-casting mold is usually required to achieve high-quality molding. However, existing die-casting molds have problems such as complex core pulling operation, low production efficiency, and easy damage, which affect product quality and production efficiency.

[0003] Therefore, developing a new type of aluminum alloy steering knuckle die-casting mold has become an urgent need in the industry. Utility Model Content

[0004] The utility model aims to provide a combined core-pulling die-casting die for an aluminum alloy steering knuckle of a beach vehicle. The die adopts a unique core-pulling structure and can automatically complete the core-pulling operation during the die-casting process.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A combined core-pulling die-casting mold for an aluminum alloy steering knuckle of a beach vehicle, comprising the following components:

[0007] Upper die and lower die: a cavity is formed between the two for accommodating aluminum alloy melt die casting, namely, upper die cavity and lower die cavity;

[0008] Core pulling mechanism: arranged in the upper die or the lower die, used to pull out the core of the mold for forming the steering knuckle brake caliper from the mold cavity during the die-casting process;

[0009] Cooling system components: distributed in the mold, used to control the mold temperature and ensure thermal stability during the die casting process;

[0010] Exhaust system components: ensure that the air inside the mold can be discharged smoothly during the die-casting process to prevent the formation of pores.

[0011] As the preferred technical solution of the utility model, in the die-casting mold structure:

[0012] An exhaust insert is opened on the top of the mold, and a negative pressure vacuum pump is added at the end of the exhaust hole to form an exhaust system component.

[0013] Multiple sets of circulating cooling pipelines are set inside the upper mold cavity and the lower mold cavity to form a cooling system component; the pipelines are arranged strictly according to the location of the hot nodes of the casting, and are connected to the machine's intelligent regulating valve and external cooling water source to remove the heat generated by the mold in the form of circulating coolant.

[0014] The core pulling mechanism is composed of a core pulling slider, a guide rail slider, a core pulling horn and a guide sleeve. The guide rail slider is assembled on the side of the upper mold cavity, and the core pulling horn is assembled on the lower mold plate.

[0015] A core-pulling mold cavity is designed on one side of the core-pulling slider, and a locking block is designed on the other side. When the two groups of core-pulling mold cavities are closed with the designated areas in the upper mold cavity and the lower mold cavity during mold closing, together forming a group of die-casting mold cavities.

[0016] The guide rail slider is designed with a transversely arranged guide rail, a guide sleeve is assembled between the two guide rail sliders, and two sides of the guide sleeve are embedded in the guide rails on the guide rail slider.

[0017] The locking block on the core-pulling slider is designed to assemble the guide sleeve together with a positioning pin and a bolt on one side, and a through hole is provided on the guide sleeve for the core-pulling horn to pass through; a group of inclined first guide grooves and second guide grooves are respectively designed on both sides of the through hole, and at the same time, a group of inclined first guide blocks and second guide blocks are respectively designed on both sides of the core-pulling horn, and the second guide block and the first guide block are arranged in an upper and lower position relationship on the side of the core-pulling horn, and are not in a straight line with each other.

[0018] A mounting hole is designed on the side of the core pulling horn facing the core pulling slider for assembling the wear-resistant block.

[0019] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0020] 1. The die-casting mold has achieved a high-efficiency, high-precision and high-stability die-casting process through optimized design. The mold adopts a unique core-pulling structure, which can automatically complete the core-pulling operation during the die-casting process, reducing manual intervention and improving production efficiency and product quality. In addition, the material selection and heat treatment process of the mold have also been specially optimized to adapt to high-frequency die-casting operations and extend the service life of the mold. The combination of multiple cavity and multiple core-pulling greatly saves the production cycle, improves the machine utilization rate, and greatly improves the die-casting production efficiency.

[0021] 2. Modular design is adopted to optimize the contact area between the ejector pin and the mold, and the ejector sleeve is added to facilitate quick replacement and maintenance; the material expansion coefficient is considered to optimize the mold structure, reduce product flash, and improve material utilization; the cooling system is optimized, and a variety of coatings are used in combination to improve the thermal stability of the mold and reduce thermal fatigue; an exhaust system is added, and the exhaust insert is combined with negative pressure extraction to ensure that the air inside the mold is discharged smoothly, which effectively improves the pore defects caused by air entrainment during filling due to structural limitations of the casting; the filling parameters are reasonably set to ensure that the casting can be die-cast. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a schematic diagram of the structure of the combined core-pulling die-casting mold for the aluminum alloy steering knuckle of a beach car.

[0023] Figure 2 It is a structural schematic diagram of the core pulling mechanism.

[0024] Figure 3 This is a schematic diagram of the structure of the core pulling mechanism (removing the limit block and the guide slider on one side).

[0025] Figure 4 It is a structural schematic diagram of the core pulling slider in the core pulling mechanism.

[0026] Figure 5 It is a schematic diagram of the structure of the guide rail slider in the core pulling mechanism.

[0027] Figure 6 It is a structural schematic diagram of the core-pulling horn in the core-pulling mechanism.

[0028] Figure 7 It is a schematic diagram of the structure of the guide sleeve in the core pulling mechanism.

[0029] The meanings of the reference numerals in the figures are as follows:

[0030] 1-upper mold plate, 2-lower mold plate, 3-upper mold cavity, 4-lower mold cavity, 5-core pulling mechanism, 6-cooling system components, 7-exhaust system components.

[0031] 51- core-pulling slider, 510- core-pulling cavity, 510- locking block.

[0032] 52-guide rail slider, 521-guide rail, 522-limit block.

[0033] 53- core-pulling horn, 531- base, 532- first guide block, 533- second guide block, 534- mounting hole, 534- wear-resistant block.

[0034] 54-guide sleeve, 541-through hole, 542-first guide groove, 543-second guide groove. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the embodiments and drawings.

[0036] Example 1

[0037] The utility model proposes a combined core-pulling die-casting mold for an aluminum alloy steering knuckle of a beach car, which adopts a modular design, and the entire mold frame is symmetrically arranged with four upper and lower molds. The number of molds produced at the same time can be adjusted according to production capacity requirements, and the mold can be quickly replaced and maintained. The mold material is selected from high-wear-resistant alloy steel, and through quenching and tempering steps, to achieve the best material performance balance, enhance its hardness and toughness, and extend the service life of the mold.

[0038] See also Figure 1 As shown, the basic structure is an upper mold plate 1 and a lower mold plate 2, an upper mold cavity 3 and a lower mold cavity 4 are respectively assembled on the upper mold plate 1 and the lower mold plate 2, and when the upper mold cavity 3 and the lower mold cavity 4 are closed, four groups of steering knuckle die-casting cavities are formed.

[0039] Multiple sets of circulating cooling pipelines are arranged inside the upper mold cavity 3 and the lower mold cavity 4 to form a cooling system component 6. These pipelines are arranged strictly according to the location of the hot spots of the casting, and are connected to the machine intelligent regulating valve and the external cooling water source to remove the heat generated by the mold in the form of circulating coolant.

[0040] An exhaust insert is provided at the top of the mold, and a negative pressure vacuum pump is added at the end of the exhaust hole to form an exhaust system component 7. The exhaust system component 7 is arranged at the top of the cavity and the upper end surface of the brake caliper. The former ensures that the air inside the mold can be discharged smoothly to prevent the problem of insufficient pouring caused by holding air during die casting, and the latter is designed to prevent air entrapment in the brake caliper and cause air hole defects.

[0041] The core pulling mechanism 5 is the design innovation of the utility model. The die casting mold is equipped with 8 sets of core pulling mechanisms 5 in total. Every two sets of core pulling mechanisms 5 are used in conjunction with one set of die casting cavity. The structure is described in detail below:

[0042] See also Figure 2-7 As shown, the core pulling mechanism 5 is composed of a core pulling slider 51, a guide slider 52, a core pulling horn 53, and a guide sleeve 54. The guide slider 52 is assembled on the side of the upper mold cavity, and the core pulling horn 53 is assembled on the lower mold plate 2.

[0043] A core-pulling mold cavity 510 is designed on one side of the core-pulling slider 51, and a locking block 511 is designed on the other side. When the mold is closed, the two groups of core-pulling mold cavities 510 are closed with the designated areas in the upper mold cavity and the lower mold cavity to form a group of die-casting mold cavities together.

[0044] The bottom of the inclined core-pulling horn 53 is designed with a base 531, and the base 531 is assembled on the lower template 2. The guide rail slider 52 is designed with a horizontally arranged guide rail 521, and a guide sleeve 54 is assembled between the two guide rail sliders 52, and the two sides of the guide sleeve 54 are embedded in the guide rail 521 on the guide rail slider 52. In addition, a limit block 522 is designed at the outer end of the guide rail 521.

[0045] The locking block 511 is designed on one side of the core-pulling slider 51 to assemble the guide sleeve 54 through the positioning pin and the bolt, and the guide sleeve 54 is provided with a through hole 541 for the core-pulling horn 53 to pass through. In order to guide the core-pulling horn 53 passing through, a group of inclined first guide grooves 542 and second guide grooves 543 are respectively designed on both sides of the through hole 541. At the same time, a group of inclined first guide blocks 532 and second guide blocks 533 are respectively designed on both sides of the core-pulling horn 53. The second guide block 533 and the first guide block 532 are arranged on the side of the core-pulling horn 53 in an up-and-down position relationship, and are not in a straight line with each other. Therefore, when the guide sleeve 54 is inserted from the top of the core-pulling horn 53, the second guide block 533 is inserted into the second guide groove 543. As the guide sleeve 54 falls, the second guide block 533 gradually disengages from the second guide groove 543, and then the first guide block 532 is inserted into the first guide groove 542 until the guide sleeve 54 is completely inserted on the core-pulling horn 53. It can be seen that when the guide sleeve 54 produces a longitudinal displacement, its lateral displacement also changes.

[0046] In the actual working process, the core-pulling horn 53 is assembled on the lower mold plate 2 through the base 531, and the guide slider 52 is assembled on the side of the upper mold cavity. At this time, the core-pulling slider 51 and the guide sleeve 54 are assembled together. As the mold closing action proceeds, the guide sleeve 54 is inserted from the top position of the core-pulling horn 53, and under the action of the guide block and the guide groove, the core-pulling slider 51 is finally completely pushed into the preset position of the mold cavity. After the die casting is completed, the action is the opposite.

[0047] In addition, a mounting hole 534 is designed on the side of the core pulling horn 53 facing the core pulling slider 51 for assembling a wear-resistant block 534. The wear-resistant block 534 is used for limiting and locking. When the die-casting mold is closed, it is supported by the core pulling slider 51.

[0048] Example 2

[0049] The die-casting method of the aluminum alloy steering knuckle of the beach car is as follows:

[0050] Step 1: All components are modularly designed to facilitate later replacement and adjustment. All connecting bolts are of the same specification. The core-pulling slider and guide sleeve are used in combination with positioning pins and bolts, which is easy to replace while ensuring accuracy. A hexagonal ejector sleeve is made on the outside of the end of the ejector that contacts the product, which effectively improves cavity wear and ensures smooth exhaust.

[0051] Step 2: When designing and making the core pulling, the material expansion coefficient is fully considered, and the parting negative number is set to ensure that the casting is produced without flash. At the same time, an exhaust insert is opened at the top of the mold, and a negative pressure vacuum pump is added at the end of the exhaust hole. The vacuum pressure is set to 20pa, which together constitutes an exhaust component to ensure that the air inside the mold cavity is emptied when the product is filled, reducing product defects caused by air entrapment.

[0052] Step 3: Before loading, spray the mold cavity for insulation. First, use 8340 paint with good adhesion as the base, and then spray the graphite paint with good insulation effect for the second time. The spraying thickness is ≥70μm, which effectively improves the insulation effect and surface quality of the mold cavity. Then preheat the mold. The upper mold preheating temperature is 400±20℃, and the lower mold preheating temperature is 380±20℃.

[0053] Step 4: Set the following pressure parameters: liquid lifting pressure 260mbar, time 8s, filling pressure 340mbar, time 20s, crusting pressure 350mbar, time 5s, holding pressure 600mbar, time 200s, cooling time 50s. After setting the pressure parameters, close the mold and fill the mold to allow the aluminum alloy solution to fill the mold cavity. After holding the pressure for a period of time, set cooling channels for local hot spots. By timing the opening of the cooling water, the casting can be solidified sequentially. After die-casting, the upper mold is opened, and the 8 core pulling mechanisms move outward at the same time under the work of the guide sleeve and other guide mechanisms to ensure smooth demolding of the casting.

[0054] The above contents are merely examples and explanations of the concept of the present utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the present utility model.

Claims

1. A combined core-pulling die-casting mold for aluminum alloy steering knuckle of beach car, characterized in that: Includes the following components: Upper die and lower die: a cavity is formed between the two for accommodating aluminum alloy melt die casting, namely, upper die cavity and lower die cavity; Core pulling mechanism: arranged in the upper die or the lower die, used to pull out the core of the mold for forming the steering knuckle brake caliper from the mold cavity during the die-casting process; Cooling system components: distributed in the mold, used to control the mold temperature and ensure thermal stability during the die casting process; Exhaust system components: ensure that the air inside the mold can be discharged smoothly during the die-casting process to prevent the formation of pores.

2. The aluminum alloy steering knuckle combined core-pulling die-casting mold for beach vehicle according to claim 1, characterized in that: An exhaust insert is opened on the top of the mold, and a negative pressure vacuum pump is added at the end of the exhaust hole to form an exhaust system component.

3. The combined core-pulling die-casting mold for the aluminum alloy steering knuckle of a beach vehicle as claimed in claim 1, characterized in that: Multiple sets of circulating cooling pipelines are set inside the upper mold cavity and the lower mold cavity to form a cooling system component; the pipelines are arranged strictly according to the location of the hot nodes of the casting, and are connected to the machine's intelligent regulating valve and external cooling water source to remove the heat generated by the mold in the form of circulating coolant.

4. The aluminum alloy steering knuckle combined core-pulling die-casting mold for beach vehicles according to any one of claims 1 to 3, characterized in that: The core pulling mechanism is composed of a core pulling slider, a guide rail slider, a core pulling horn and a guide sleeve. The guide rail slider is assembled on the side of the upper mold cavity, and the core pulling horn is assembled on the lower mold plate.

5. The combined core-pulling die-casting mold for the aluminum alloy steering knuckle of a beach vehicle as claimed in claim 4, characterized in that: A core-pulling mold cavity is designed on one side of the core-pulling slider, and a locking block is designed on the other side. When the two groups of core-pulling mold cavities are closed with the designated areas in the upper mold cavity and the lower mold cavity during mold closing, together forming a group of die-casting mold cavities.

6. The combined core-pulling die-casting mold for the aluminum alloy steering knuckle of a beach vehicle as claimed in claim 5, characterized in that: The guide rail slider is designed with a transversely arranged guide rail, a guide sleeve is assembled between the two guide rail sliders, and two sides of the guide sleeve are embedded in the guide rails on the guide rail slider.

7. The combined core-pulling die-casting mold for the aluminum alloy steering knuckle of a beach vehicle as claimed in claim 5, characterized in that: The locking block on the core-pulling slider is designed to assemble the guide sleeve together with a positioning pin and a bolt on one side, and a through hole is provided on the guide sleeve for the core-pulling horn to pass through; a group of inclined first guide grooves and second guide grooves are respectively designed on both sides of the through hole, and at the same time, a group of inclined first guide blocks and second guide blocks are respectively designed on both sides of the core-pulling horn, and the second guide block and the first guide block are arranged in an upper and lower position relationship on the side of the core-pulling horn, and are not in a straight line with each other.

8. The combined core-pulling die-casting mold for the aluminum alloy steering knuckle of a beach vehicle as claimed in claim 5, characterized in that: A mounting hole is designed on the side of the core pulling horn facing the core pulling slider for assembling the wear-resistant block.

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