Multi-station die for inlay casting of bimetal composite shaft

Abstract

The utility model belongs to metal casting technical field, concretely relates to a multi -position mould for bimetallic composite axle inlay casting, including support, crucible, the lid body that cooperates with crucible, be equipped with multiple stations of cooperation with crucible on the support, help to improve casting efficiency, the bottom of support still is equipped with the limiting hole of cooperation with the clearance of crucible, be equipped with first positioning hole on the lid body, when the lid body cooperates fixed with crucible, first positioning hole is coaxial with crucible, and first positioning hole diameter is less than the inside diameter of crucible. Through setting up crucible limiting structure in the upper portion and lower portion of support, increase the lid body that cooperates with crucible simultaneously, set up the positioning hole of adapting to the core rod on the lid body, to ensure the coaxial degree of core rod with crucible in the process of pressing down, reduce casting defect, when the crucible is placed on the support, keep the bottom of crucible and ground at least 20cm interval, avoid the problem of cooling speed too fast caused by contact cooling.

Description

Technical Field

[0001] This utility model belongs to the field of metal casting technology, specifically relating to a multi-station mold for bimetallic composite shaft inlay casting. Background Technology

[0002] Bimetallic composite shaft inlay casting is a process in which a preheated solid metal mandrel is inserted into another molten metal and cooled to form a bimetallic composite shaft. The existing molds used for bimetallic inlay casting are mainly crucibles, which are fixed on a metal base. The bimetallic composite shaft is formed by placing the molten metal in the crucible and then inserting the metal mandrel into the molten metal.

[0003] In the bimetallic composite shaft inlay casting process, it is necessary to ensure that the solid metal mandrel can be inserted vertically into the melt to ensure the coaxiality of the mandrel and the melt in the crucible. This can avoid element segregation and poor interface bonding caused by centering deviation. Good coaxiality between the mandrel and the crucible also provides a good processing foundation for subsequent processing. In actual inlay casting operations, the coaxiality between the two mainly depends on human operating experience, and batch quality is uncontrollable.

[0004] Furthermore, air cooling is generally used during the cooling stage to provide sufficient time for atomic diffusion at the interface, promoting good metallurgical bonding. However, in existing molds, the bottom of the crucible is in direct contact with the metal base, causing the crucible to cool too quickly, inhibiting atomic diffusion at the interface and resulting in poor metallurgical bonding. In addition, current operations are limited to single-crucible casting, with a melting, insertion, and cooling cycle of approximately 45 minutes. The next bimetallic composite shaft sample can only be prepared after cooling and sampling, making it difficult to achieve multi-station inlay casting operations and resulting in low sample preparation efficiency. Summary of the Invention

[0005] To address the problems of low sample preparation efficiency, poor coaxiality between the mandrel and the molten cladding material, and poor interfacial metallurgical bonding caused by excessively rapid cooling in existing bimetallic composite shaft inlay casting molds, this application aims to provide a multi-station mold for bimetallic composite shaft inlay casting. This is achieved by adding stations to a metal support and setting crucible limiting structures at both the upper and lower parts of the metal base to maintain the verticality of the crucible. Additionally, a lid is added to mate with the crucible, with positioning holes on the lid adapted to the mandrel to ensure coaxiality between the mandrel and the crucible during the pressing process. To prevent excessively rapid crucible cooling, when the crucible is placed on the support, the bottom of the crucible is kept at least 20 cm away from the ground to avoid excessively rapid cooling caused by contact cooling.

[0006] Based on the above objectives, the technical solution adopted in this application is as follows: A multi-station mold for bimetallic composite shaft inlay casting includes a support, a crucible, and a cover that mates with the crucible. The support has multiple stations that mate with the crucible. The bottom of the support also has a limiting hole that mates with the crucible. When the crucible is placed on a station, the distance between the bottom of the crucible and the horizontal plane on which the support is placed is not less than 20 cm. The cover has a first positioning hole. When the cover is fixed to the crucible, the first positioning hole is coaxial with the crucible, and the diameter of the first positioning hole is smaller than the inner diameter of the crucible.

[0007] This invention employs a support structure with multiple crucible stations, enabling simultaneous inlay casting of multiple samples and improving casting efficiency.

[0008] A crucible limiting hole is set at the bottom of the support to ensure the verticality of the crucible when it is placed on the support. A first positioning hole smaller than the inner diameter of the crucible is opened on the cover. When the cover and the crucible are used together, the first positioning hole is coaxial with the crucible. The first positioning hole limits the mandrel to be embedded and cast, ensuring that the mandrel is inserted into the melt in the crucible along the central axis of the crucible. This makes the mandrel of the finished casting centered on the coating material, avoiding casting defects and facilitating subsequent processing.

[0009] In addition, when the crucible is placed on the support, the distance between its bottom and the support surface is not less than 20cm. This avoids the bottom of the crucible from directly contacting the ground or other support surfaces, thus preventing the crucible from cooling too quickly due to bottom contact and causing adverse effects on the interfacial bonding strength of the casting.

[0010] Furthermore, the crucible consists of a pot body and an outer edge of the top of the pot body; the workstation includes a first workstation and a second workstation, the first workstation is located at the center of the support, and the second workstation is distributed in a circular array on the outer side of the first workstation; the first workstation consists of a first annular plate located at the center of the top of the support and a reinforcing rib connecting the first annular plate to the top frame of the support, the first annular plate serves as a support for the outer edge of the crucible, and the inner ring of the first annular plate is in clearance fit with the pot body of the crucible.

[0011] The support structure consists of a central first workstation and peripheral second workstations, which maximizes the utilization of the support structure.

[0012] Furthermore, the second station is formed by the top frame of the support, the reinforcing ribs, and the outer edge of the first annular plate; the top frame of the support, the reinforcing ribs, and the first annular plate together form the support part of the outer edge of the crucible.

[0013] The reasonable size design of the first and second workstations on the support allows the top frame, reinforcing ribs, and first annular plate of the support to also support the crucible.

[0014] Furthermore, the second station is composed of a second annular plate that is integrally connected with the first annular plate and the support frame. The second annular plate serves as a support for the outer edge of the crucible, and the inner ring of the second annular plate is fitted with the crucible body with a clearance.

[0015] The top and bottom of the crucible at the first station are limited by a first annular plate and a limiting hole, respectively. In order to better limit the top of the crucible, the second station also adopts an annular plate structure.

[0016] Furthermore, the support structure is a three-layer structure, with the bottom layer being the same as the top layer.

[0017] When the support uses the first annular plate and the second annular plate to limit the top of the crucible, the bottom layer of the support is designed with the same structure as the top layer, rather than just a plate structure with limiting holes. This increases the perforation of the bottom layer of the support, which is more conducive to air convection when the crucible is air-cooled.

[0018] Furthermore, the cover body includes a lower cover body that fits with the crucible through a gap, and an upper cover body that fits with the lower cover body; both the lower cover body and the upper cover body are provided with a first positioning hole.

[0019] The first positioning holes on the upper and lower covers limit the insertion of the embedded casting mandrel to ensure that the mandrel is inserted into the center of the melt.

[0020] Furthermore, both the lower and upper cover are provided with a second positioning hole. When the crucible, the lower cover, and the upper cover are sequentially fitted and fixed, the second positioning holes on the upper cover and the lower cover are vertically aligned, and their vertical projection is located at the outer edge of the crucible, so that the position of the cover can be easily fixed by using a positioning pin.

[0021] Furthermore, the mold also includes locating pins that mate with the second locating hole; the number of locating pins and the second locating hole is the same, ranging from 3 to 8.

[0022] Furthermore, the number of workstations is five.

[0023] The device described in this application can simultaneously perform inlay casting operations on multiple crucibles, greatly improving casting efficiency.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows: This application presents a multi-station mold for bimetallic inlay casting, employing a limiting structure for the top and bottom of the crucible on a support. A first annular plate, a second annular plate, and a limiting hole vertically limit the top and bottom of the crucible, respectively. Simultaneously, a first positioning hole coaxial with the lid is provided. When the lid mates with the crucible, the mandrel is inserted into the molten material within the crucible through the first positioning hole, ensuring the coaxiality of the mandrel and the molten material inside the crucible. Furthermore, when the crucible is placed on the support, there is a certain distance between the bottom of the crucible and the bottom surface of the support, facilitating air cooling of the crucible and avoiding excessively rapid cooling rates and poor interface bonding caused by contact cooling. Moreover, by using five stations on the support, the casting efficiency is significantly improved compared to existing single-station casting methods. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural diagram of the five crucibles in Example 1; Figure 2 This is a schematic diagram of the single crucible structure in Example 1; Figure 3 This is a diagram showing the disassembled state of a single crucible in Example 1; Figure 4 This is a structural diagram of the support frame in Example 1; Figure 5 This is a structural diagram of the crucible in Example 1; Figure 6 This is a diagram showing the disassembled state of the cover in Example 1; Figure 7 This is a cross-sectional view of the cover assembly in Example 1; Figure 8 This is a structural diagram of the support frame in Example 2; Figure 9 This is a structural diagram of the upper cover with 3 positioning holes in Example 4; Figure 10 This is a structural diagram of the upper cover with 4 positioning holes in Example 4; Figure 11 This is a structural diagram of the top cover with 5 positioning holes in Example 4; Figure 12 This is a structural diagram of the top cover with 6 positioning holes in Example 4; Figure 13 This is a structural diagram of the top cover with 7 positioning holes in Example 4.

[0027] Reference numerals in the attached diagram: 1. Support; 101. Frame; 102. First annular plate; 103. Reinforcing rib; 104. Limiting hole; 105. Second annular plate; 2. Crucible; 201. Pot body; 202. Outer edge; 3. Lid; 301. Lower lid; 302. Upper lid; 303. First positioning hole; 304. Second positioning hole; 305. Positioning pin. Detailed Implementation Example 1

[0028] To address the problems of low casting efficiency, poor coaxiality, and excessively rapid cooling rates in existing inlay casting molds, this embodiment provides a multi-station mold for inlay casting of bimetallic composite shafts, such as... Figures 1-7 As shown, the system includes a support 1, a crucible 2, and a cover 3 that mates with the crucible 2. The support 1 has a three-layer structure and is preferably made of 310S heat-resistant steel, which can be used for a long time at 1100℃. The support 1 has five workstations that mate with the crucible 2, including one first workstation and four second workstations. The first workstation is located at the center of the support 1, and the four second workstations are arranged in a circular array around the outer side of the first workstation. This layout maximizes the utilization of the support 1, and the five workstations can perform casting operations simultaneously, improving the efficiency of bimetallic inlay casting.

[0029] The crucible 2 consists of a pot body 201 and an outer edge 202 at the top of the pot body 201. The first working station consists of a first annular plate 102 located at the center of the top of the support 1 and a reinforcing rib 103 connecting the first annular plate 102 to the top frame 101 of the support 1. The first annular plate 102 serves as a support for the outer edge 202 of the crucible 2, and the inner ring of the first annular plate 102 is in clearance fit with the pot body 201 of the crucible 2. A limiting hole 104 with clearance fit to the crucible 2 is also provided at the bottom of the support 1. The first working station simultaneously limits the top and bottom of the crucible 2 through the first annular plate 102 and the limiting hole 104 at the bottom of the crucible 2, which can ensure the verticality of the crucible 2 during use.

[0030] The second station is formed by the top frame 101 of the support 1, the reinforcing rib 103, and the outer edge of the first annular plate 102. The reasonable size design of the first and second stations on the support 1 allows the crucible 2 to be supported by the top frame 101, the reinforcing rib 103, and the first annular plate 102. The second station mainly relies on the limiting hole 104 at the bottom of the support 1 to vertically limit the crucible 2.

[0031] The cover 3 includes a lower cover 301 that fits with the crucible 2 with a clearance, and an upper cover 302 that fits with the lower cover 301. Both the lower cover 301 and the upper cover 302 are provided with a first positioning hole 303. The diameter of the first positioning hole 303 is smaller than the inner diameter of the crucible 2. When the upper cover 302 and the lower cover 301 are fixed with the crucible 2, the first positioning hole 303 is used to limit the insertion of the mandrel for inlay casting, ensuring that the mandrel is inserted into the melt in the crucible 2 along the central axis of the crucible 2, so that the mandrel of the finished casting is in the center of the coating material, avoiding casting defects, and facilitating subsequent processing. Both the lower cover 301 and the upper cover 302 are provided with a second positioning hole 304 and a positioning pin 305 that cooperates with the second positioning hole 304. When the crucible 2, the lower cover 301 and the upper cover 302 are fixed in sequence, the second positioning hole 304 on the upper cover 302 and the lower cover 301 are vertically aligned, and their vertical projection is located on the outer edge 202 of the crucible 2. The positioning pin 305 is mainly used to fix the upper cover 302 and the lower cover 301.

[0032] In addition, when the crucible 2 is placed on the support 1, the distance between the bottom of the crucible 2 and the plane on which the support 1 is placed shall not be less than 20cm, so as to avoid the bottom of the crucible 2 directly contacting the ground or other planes on which the support 1 is placed, thereby avoiding the problem that the crucible 2 cools too quickly due to bottom contact cooling, which may have an adverse effect on the interface bonding strength of the casting. Example 2

[0033] Since the second station in Embodiment 1 relies solely on the limiting hole 104 at the bottom of the support 1 to limit the crucible 2, the verticality limitation of the crucible 2 is insufficient. Especially when the length of the crucible 2 is insufficient and does not pass through the limiting hole 104 at the bottom of the support 1, the crucible 2 may not be vertically limited. Therefore, this embodiment further improves the second station of the support 1 based on Embodiment 1, such as... Figure 8 As shown, the second station consists of a second annular plate 105 integrally connected with the first annular plate 102 and the frame 101 of the support 1. The second annular plate 105 serves as a support for the outer edge 202 of the crucible 2, and the inner ring of the second annular plate 105 is in clearance fit with the pot body 201 of the crucible 2. In this embodiment, the bottom layer of the support 1 is also designed with the same structure as the top layer, rather than just a plate structure with limiting holes 104. This increases the perforation of the bottom layer of the support 1, which is more conducive to air convection during the air cooling of the crucible 2. Example 3

[0034] Since the upper cover 302 and the lower cover 301 are separate structures, to prevent them from moving or shifting during the casting process, multiple second positioning holes 304 and positioning pins 305 are used for simple fixation. In embodiment 1, the number of second positioning holes 304 and positioning pins 305 is 8, but it can also be as follows: Figures 9-13 The numbers shown are 3, 4, 5, 6, and 7.

Claims

1. A multi-station mold for bimetallic composite shaft inlay casting, characterized in that, The device includes a support, a crucible, and a cover that mates with the crucible. The support has multiple workstations that mate with the crucible. The bottom of the support also has a limiting hole that fits with the crucible with a gap. When the crucible is placed on the workstation, the distance between the bottom of the crucible and the horizontal plane on which the support is placed is not less than 20 cm. The cover has a first positioning hole. When the cover is fixed to the crucible, the first positioning hole is coaxial with the crucible, and the diameter of the first positioning hole is smaller than the inner diameter of the crucible.

2. The multi-station mold for bimetallic composite shaft inlay casting according to claim 1, characterized in that, The crucible consists of a pot body and an outer edge of the top of the pot body; the work station includes a first work station and a second work station, the first work station is located at the center of the support, and the second work stations are distributed in a circular array on the outer side of the first work station; the first work station consists of a first annular plate located at the center of the top of the support and a reinforcing rib connecting the first annular plate to the top frame of the support, the first annular plate serves as a support for the outer edge of the crucible, and the inner ring of the first annular plate is in clearance fit with the pot body of the crucible.

3. The multi-station mold for bimetallic composite shaft inlay casting according to claim 2, characterized in that, The second workstation is formed by the top frame of the support, the reinforcing ribs, and the outer edge of the first annular plate; the top frame of the support, the reinforcing ribs, and the first annular plate together form the support part of the outer edge of the crucible.

4. The multi-station mold for bimetallic composite shaft inlay casting according to claim 2, characterized in that, The second station is composed of a second annular plate that is integrally connected with the first annular plate and the support frame. The second annular plate serves as a support for the outer edge of the crucible, and the inner ring of the second annular plate is fitted with the crucible body with a clearance.

5. The multi-station mold for bimetallic composite shaft inlay casting according to claim 4, characterized in that, The support structure is a three-layer structure, with the bottom layer being the same as the top layer.

6. The multi-station mold for bimetallic composite shaft inlay casting according to claim 1, characterized in that, The cover includes a lower cover that fits with the crucible through a gap, and an upper cover that fits with the lower cover; both the lower cover and the upper cover are provided with a first positioning hole.

7. The multi-station mold for bimetallic composite shaft inlay casting according to claim 6, characterized in that, Both the lower cover and the upper cover are provided with a second positioning hole. When the crucible, the lower cover and the upper cover are fixed together in sequence, the second positioning hole on the upper cover and the lower cover are vertically aligned, and their vertical projection is located at the outer edge of the crucible.

8. The multi-station mold for bimetallic composite shaft inlay casting according to claim 6, characterized in that, The mold also includes positioning pins that mate with the second positioning hole; the number of positioning pins and the second positioning hole is the same, ranging from 3 to 8.

9. The multi-station mold for bimetallic composite shaft inlay casting according to claim 1, characterized in that, The number of workstations is five.

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