A centrifugal casting mold for tin bronze sleeves

Abstract

This utility model discloses a centrifugal casting mold for tin bronze sleeves, belonging to the field of centrifugal casting technology. It includes a mold body and a support plate. The mold body is mounted on a vertical centrifugal casting machine, and the support plate is mounted on a lifting device. A feeding structure is mounted on the support plate, comprising a cylindrical tube and a feeding port. The lower end of the cylindrical tube is placed inside the mold body, and the cylindrical tube is not coaxial with the mold body. A worm gear is fixedly installed on the upper end of the side wall of the cylindrical tube, and a discharge structure is fixedly installed on the side wall of the cylindrical tube. A drainage cavity is opened inside the discharge structure. By setting the discharge structure so that the discharge direction is consistent with the mold rotation direction, this utility model makes the molten metal flow direction similar to the tangential velocity of the mold inner wall, significantly reducing impact. This allows the molten metal to spread smoothly and in a laminar flow-like manner on the mold inner wall, effectively mitigating defects such as porosity and inclusions caused by turbulence and impact, and improving the density and uniformity of the casting structure.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal casting technology, and specifically provides a centrifugal casting mold for tin bronze sleeves. Background Technology

[0002] Centrifugal casting is a crucial process for producing tin bronze sleeve-type parts. It utilizes the centrifugal force generated by the high-speed rotation of the mold to force molten metal to adhere tightly to the mold cavity, resulting in a dense casting. However, in traditional vertical centrifugal casting, molten metal is typically injected into the high-speed rotating mold cavity via a fixed gating port or simple guide pipe, falling freely. Because the initial direction of the injected molten metal flow has a large angle with the rotational tangent of the mold's inner wall, the molten metal collides and impacts violently with the mold's inner wall or the already solidified metal layer. This impact induces severe turbulence and easily entrains air and oxide impurities, leading to defects such as porosity, inclusions, and cold shuts in the casting, severely affecting its mechanical properties and quality. Therefore, it is necessary to design a centrifugal casting mold for tin bronze sleeves. Utility Model Content

[0003] To solve the above problems, this utility model provides a centrifugal casting mold for tin bronze sleeves.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a centrifugal casting mold for tin bronze sleeves, comprising a mold body and a support plate. The mold body is mounted on a vertical centrifugal casting machine, and the support plate is mounted on a lifting device, with the support plate located above the mold body. A feeding structure is mounted on the support plate, comprising a cylindrical tube and a feeding port, with the feeding port fixedly installed at the upper end of the cylindrical tube. The lower end of the cylindrical tube is placed inside the mold body, and the cylindrical tube is not coaxial with the mold body. A worm gear is fixedly installed on the upper end of the side wall of the cylindrical tube. A worm structure meshing with the worm gear is mounted on the side wall of the support plate. A discharge structure is fixedly installed on the side wall of the cylindrical tube. A drainage cavity is opened inside the discharge structure, and the drainage cavity communicates with the inner cavity of the cylindrical tube. The discharge direction at the end of the discharge structure is the same as the rotation direction of the mold body.

[0005] Furthermore, the mold body includes a lower mold, an outer mold, and a mold cover. The lower outer wall of the outer mold has an installation groove. The upper surface of the lower mold has an annular protrusion that matches the installation groove. The upper outer wall of the outer mold has a retaining ring that is integrally formed. The lower surface of the mold cover has a retaining groove that matches the retaining ring.

[0006] Furthermore, it also includes a slide rail, which is mounted on the lifting device. The lower surface of the support plate has a side plate and a fixing plate integrally formed on the left and right sides respectively. The worm gear structure is mounted on the side plate. The lower surface of the support plate has sliders integrally formed symmetrically on the front and rear sides, and the sliders are movably mounted on the slide rail.

[0007] Furthermore, a push block is fixedly installed on the outer surface of the side plate, and the push block is connected to an external horizontal power mechanism.

[0008] Furthermore, a limiting ring is integrally formed on the lower side of the outer wall of the feed port, and the limiting ring is placed on the upper surface of the support plate.

[0009] Furthermore, the worm structure includes a motor assembly and a worm. The motor assembly is fixedly installed on the outer surface of the side plate. One end of the transmission shaft is fixedly installed at the output end of the motor assembly. A cylindrical groove is opened on the inner surface of the fixed plate, and the other end of the transmission shaft is assembled in the cylindrical groove. The worm is integrally formed on the transmission shaft, and the worm meshes with the worm wheel.

[0010] Furthermore, the discharge structure is formed by splicing and installing an outer guide plate and an inner guide plate. The outer guide plate includes an outer inclined section and an outer horizontal arc-shaped section. The upper end of the outer inclined section is fitted to the side wall of the cylindrical tube. The outer horizontal arc-shaped section is integrally formed at the lower end of the outer inclined section. The outer end of the outer horizontal arc-shaped section is arc-shaped. The inner guide plate includes an inner inclined section that matches the outer inclined section and an inner horizontal arc-shaped section that matches the outer horizontal arc-shaped section. A drainage cavity is formed between the outer guide plate and the inner guide plate.

[0011] Furthermore, an outer partition plate is uniformly fixedly installed on the inner wall of the outer guide plate, and an inner partition plate matching the outer partition plate is uniformly fixedly installed on the outer wall of the inner guide plate. The outer partition plate and the inner partition plate divide the drainage cavity to form a flow channel, and the outer end of the drainage cavity is a mixing cavity that is interconnected.

[0012] The beneficial effects of using this utility model are:

[0013] This invention features a discharge structure where the discharge direction is aligned with the mold rotation direction, making the molten metal flow direction similar to the tangential velocity of the mold's inner wall. This significantly reduces impact, allowing the molten metal to spread smoothly and in a laminar flow-like manner on the mold's inner wall. This effectively mitigates defects such as porosity and inclusions caused by turbulence and impact, and helps improve the density and uniformity of the casting structure.

[0014] This invention features a rotatable feeding and discharging structure driven by a worm gear and worm wheel. By utilizing their eccentric arrangement, the distance between the discharge port and the inner wall of the mold can be continuously adjusted during the casting process. As the molten metal flows in and the casting wall thickness increases, the discharge port moves away synchronously. This ensures that the molten metal inlet point and the molten metal inside the mold maintain a relatively optimal distance throughout the entire casting cycle, reducing the impact and splashing of the molten metal and improving the quality of the casting.

[0015] This invention features a discharge structure with internal flow channels and mixing chambers. The molten metal is dispersed before flowing out and then mixed at the end, resulting in a more continuous and uniform flow and improved material distribution. Attached Figure Description

[0016] Figure 1 This is one of the three-dimensional schematic diagrams of this utility model.

[0017] Figure 2 This is the second three-dimensional schematic diagram of the present invention.

[0018] Figure 3 This is the front sectional view of the present invention.

[0019] Figure 4 This is a three-dimensional schematic diagram of the feeding structure, worm gear structure and discharging structure of this utility model.

[0020] Figure 5 This is a three-dimensional schematic diagram of the outer guide plate of this utility model.

[0021] Figure 6 This is a three-dimensional schematic diagram of the inner guide plate of this utility model.

[0022] The reference numerals in the attached drawings include: 1. Mold body; 11. Lower mold; 12. Outer mold; 121. Snap ring; 122. Mounting groove; 13. Mold cover; 2. Support plate; 21. Side plate; 22. Fixing plate; 23. Slider; 24. Push block; 3. Feeding structure; 31. Cylindrical tube; 32. Limiting ring; 33. Feed port; 34. Worm gear; 4. Worm structure; 41. Motor assembly; 42. Drive shaft; 43. Worm; 5. Discharge structure; 51. Outer guide plate; 511. Outer inclined section; 512. Outer horizontal arc section; 513. Outer partition; 52. Inner guide plate; 521. Inner inclined section; 522. Inner horizontal arc section; 523. Inner partition; 53. Flow channel; 54. Mixing chamber; 6. Slide rail. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Reference Figures 1 to 6A centrifugal casting mold for tin bronze sleeves includes a mold body 1 and a support plate 2. The mold body 1 is mounted on a vertical centrifugal casting machine, and the support plate 2 is mounted on a lifting device. The support plate 2 is located above the mold body 1. A feeding structure 3 is mounted on the support plate 2. The feeding structure 3 includes a cylindrical cylinder 31 and a feeding port 33. The feeding port 33 is fixedly installed at the upper end of the cylindrical cylinder 31. The lower end of the cylindrical cylinder 31 is placed inside the mold body 1, and the cylindrical cylinder 31 is not coaxial with the mold body 1. A worm gear 34 is fixedly installed on the upper end of the side wall of the cylindrical cylinder 31. A worm structure 4 that meshes with the worm gear 34 is mounted on the side wall of the support plate 2. A discharge structure 5 is fixedly installed on the side wall of the cylindrical cylinder 31. A drainage cavity is opened inside the discharge structure 5, and the drainage cavity is connected to the inner cavity of the cylindrical cylinder 31. The discharge direction of the end of the discharge structure 5 is the same as the rotation direction of the mold body 1.

[0025] The vertical centrifugal casting machine drives the mold body 1 to rotate, completing the centrifugal casting work; the lifting device controls the movement of the support plate 2, completing the placement of the feeding structure 3 and the discharging structure 5 in the mold body 1; the molten metal is poured into the feeding structure 3 and flows out through the discharging structure 5 into the mold body 1 to carry out the centrifugal casting work.

[0026] The molten metal flows out from the discharge structure 5. Because the discharge direction at the end of the discharge structure 5 is the same as the rotation direction of the mold body 1, the impact of the molten metal on the inner wall of the mold or the surface of the molten metal that has already flowed out is greatly reduced. This further reduces the risk of turbulence and gas entrapment, allowing the molten metal to spread to the inner wall of the mold or the surface of the molten metal that has already flowed in a laminar flow similar to a water curtain, which can effectively improve the quality of the casting.

[0027] The worm gear structure 4 can drive the feeding structure 3 to rotate, which in turn drives the discharging structure 5 to rotate. Because the feeding structure 3 is eccentrically arranged inside the mold body 1, and its initial position is the position where the discharging structure 5 is closest to the inner wall of the mold, when the discharging structure 5 rotates with the feeding structure 3, the distance between the discharge port end of the discharging structure 5 and the inner wall of the mold gradually increases. This is suitable for situations where the molten metal gradually flows in and the thickness increases. When the feeding structure 3 rotates 180°, the distance between the discharge port end of the discharging structure 5 and the inner wall of the mold is the largest. In the feeding process, the maximum angle that the feeding structure 3 and the discharging structure 5 need to rotate is 180°.

[0028] Specifically, such as Figure 1 and Figure 3 As shown, the mold body 1 includes a lower mold 11, an outer mold 12, and a mold cover 13. The lower outer wall of the outer mold 12 is provided with an installation groove 122. The upper surface of the lower mold 11 is integrally formed with an annular protrusion that matches the installation groove 122. The upper outer wall of the outer mold 12 is integrally formed with a retaining ring 121. The lower surface of the mold cover 13 is provided with a retaining groove that matches the retaining ring 121.

[0029] Specifically, such as Figure 1 and Figure 2 As shown, it also includes a slide rail 6, which is mounted on the lifting device. The lower surface of the support plate 2 has a side plate 21 and a fixed plate 22 integrally formed on the left and right sides respectively. The worm gear structure 4 is mounted on the side plate 21. The lower surface of the support plate 2 has sliders 23 integrally formed symmetrically on the front and rear sides, and the sliders 23 are movably mounted on the slide rail 6.

[0030] Specifically, such as Figure 1 As shown, a push block 24 is fixedly installed on the outer surface of the side plate 21, and the push block 24 is connected to an external horizontal power mechanism.

[0031] The height of the support plate 2, the feeding structure 3, and the discharging structure 5 can be adjusted by an external lifting device. The support plate 2 can be moved horizontally on the slide rail 6 by an external horizontal power mechanism. Through the adjustment of the above two movements, the feeding structure 3 and the discharging structure 5 can be put into the mold body 1 and taken out of the mold body 1. They are put in before the feeding operation and removed after the feeding operation is completed.

[0032] The external horizontal power mechanism can be an electric push rod or a hydraulic cylinder, pneumatic cylinder, or other similar structure.

[0033] Specifically, such as Figure 1 and Figure 3 As shown, a limiting ring 32 is integrally formed on the lower side of the outer wall of the inlet 33, and the limiting ring 32 is placed on the upper surface of the support plate 2. The limiting ring 32 plays a limiting role, so that the support plate 2 can effectively support the inlet structure 3.

[0034] A through hole is provided on the support plate 2, through which the cylindrical tube 31 passes. A bearing can be installed at the through hole to ensure the effective rotation of the cylindrical tube 31 and the limiting ring 32. The worm gear 34 can be fixed to the cylindrical tube 31 by welding or other installation methods.

[0035] Specifically, such as Figure 4 As shown, the worm structure 4 includes a motor assembly 41 and a worm 43. The motor assembly 41 is fixedly installed on the outer surface of the side plate 21. One end of the transmission shaft 42 is fixedly installed at the output end of the motor assembly 41. A cylindrical groove is opened on the inner surface of the fixing plate 22, and the other end of the transmission shaft 42 is assembled in the cylindrical groove. The worm 43 is integrally formed on the transmission shaft 42, and the worm 43 meshes with the worm wheel 34.

[0036] The motor assembly 41 includes a motor body and a protective shell. The motor body is placed inside the protective shell, which mainly serves to protect and insulate against heat. In addition, a fan structure can be installed at the lifting equipment or external horizontal power mechanism, mainly to blow hot air away from the motor assembly 41.

[0037] Specifically, such as Figures 3 to 6As shown, the discharge structure 5 is formed by splicing and installing an outer guide plate 51 and an inner guide plate 52. The outer guide plate 51 includes an outer inclined section 511 and an outer horizontal arc section 512. The upper end of the outer inclined section 511 is fitted to the side wall of the cylindrical tube 31. The outer horizontal arc section 512 is integrally formed at the lower end of the outer inclined section 511. The outer end of the outer horizontal arc section 512 is arc-shaped. The inner guide plate 52 includes an inner inclined section 521 that matches the outer inclined section 511 and an inner horizontal arc section 522 that matches the outer horizontal arc section 512. A drainage cavity is formed between the outer guide plate 51 and the inner guide plate 52.

[0038] The design of the outward inclined section 511 and the inward inclined section 521 allows the molten metal to convert gravitational potential energy into kinetic energy after flowing into the discharge structure 5, thereby increasing the outflow speed, reducing the speed difference between the molten metal and the mold body 1, and improving the stability of the casting process.

[0039] The design of the outer horizontal arc segment 512 and the inner horizontal arc segment 522 is mainly intended to change the outflow direction of the molten metal, so as to prevent the molten metal from directly impacting the inner wall of the mold or the molten metal that has already flowed in, thereby preventing gas from mixing in.

[0040] Specifically, such as Figures 4 to 6 As shown, an outer partition 513 is uniformly fixedly installed on the inner wall of the outer guide plate 51, and an inner partition 523 matching the outer partition 513 is uniformly fixedly installed on the outer wall of the inner guide plate 52. The outer partition 513 and the inner partition 523 divide the drainage cavity to form a flow channel 53, and the outer end of the drainage cavity is a mixing cavity 54 that is interconnected.

[0041] If the outer guide plate 51 and the inner guide plate 52 only have complete drainage cavities, the molten metal is easily affected by gravity and mainly distributed on the lower side when it flows through, which affects the uniform distribution effect after it flows out. By setting the flow channel 53, the molten metal can be evenly distributed in the drainage cavity, and before flowing out, it can be interconnected in the mixing cavity 54 to form a state similar to a water curtain, which can be evenly distributed when flowing out, greatly reducing the impact, avoiding the rain effect, and improving the casting quality.

[0042] The above content is only a preferred embodiment of this utility model. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the idea of ​​this utility model. As long as these changes do not depart from the concept of this utility model, they all fall within the protection scope of this utility model.

Claims

1. A centrifugal casting mold for tin bronze sleeves, characterized in that: The system includes a mold body and a support plate. The mold body is mounted on a vertical centrifugal casting machine, and the support plate is mounted on a lifting device, with the support plate positioned above the mold body. A feeding structure is mounted on the support plate, comprising a cylindrical tube and a feeding port. The feeding port is fixedly installed at the upper end of the cylindrical tube, and the lower end of the cylindrical tube is placed inside the mold body. The cylindrical tube and the mold body are not coaxial. A worm gear is fixedly installed on the upper end of the side wall of the cylindrical tube. A worm structure meshing with the worm gear is mounted on the side wall of the support plate. A discharge structure is fixedly installed on the side wall of the cylindrical tube. The discharge structure has a drainage cavity inside, which communicates with the inner cavity of the cylindrical tube. The discharge direction at the end of the discharge structure is the same as the rotation direction of the mold body.

2. The centrifugal casting mold for tin bronze sleeves according to claim 1, characterized in that: The mold body includes a lower mold, an outer mold, and a mold cover. The lower outer wall of the outer mold has an installation groove. The upper surface of the lower mold has an annular protrusion that matches the installation groove. The upper outer wall of the outer mold has a retaining ring that is integrally formed. The lower surface of the mold cover has a retaining groove that matches the retaining ring.

3. The centrifugal casting mold for tin bronze sleeves according to claim 1, characterized in that: It also includes a slide rail, which is mounted on the lifting device. The lower surface of the support plate has a side plate and a fixing plate integrally formed on the left and right sides respectively. The worm gear structure is mounted on the side plate. The lower surface of the support plate has sliders integrally formed symmetrically on the front and rear sides, and the sliders are mounted on the slide rail.

4. The centrifugal casting mold for tin bronze sleeves according to claim 3, characterized in that: A push block is fixedly installed on the outer surface of the side plate, and the push block is connected to an external horizontal power mechanism.

5. The centrifugal casting mold for tin bronze sleeves according to claim 1, characterized in that: A limiting ring is integrally formed on the lower side of the outer wall of the feed port, and the limiting ring is placed on the upper surface of the support plate.

6. The centrifugal casting mold for tin bronze sleeves according to claim 3, characterized in that: The worm gear structure includes a motor assembly and a worm. The motor assembly is fixedly installed on the outer surface of the side plate. One end of the drive shaft is fixedly installed at the output end of the motor assembly. A cylindrical groove is opened on the inner surface of the fixed plate, and the other end of the drive shaft is assembled in the cylindrical groove. The worm is integrally formed on the drive shaft, and the worm meshes with the worm wheel.

7. The centrifugal casting mold for tin bronze sleeves according to claim 1, characterized in that: The discharge structure is formed by splicing and installing an outer guide plate and an inner guide plate. The outer guide plate includes an outer inclined section and an outer horizontal arc-shaped section. The upper end of the outer inclined section is fitted to the side wall of the cylindrical tube. The outer horizontal arc-shaped section is integrally formed at the lower end of the outer inclined section. The outer end of the outer horizontal arc-shaped section is arc-shaped. The inner guide plate includes an inner inclined section that matches the outer inclined section and an inner horizontal arc-shaped section that matches the outer horizontal arc-shaped section. A drainage cavity is formed between the outer guide plate and the inner guide plate.

8. A centrifugal casting mold for tin bronze sleeves according to claim 7, characterized in that: The inner wall of the outer guide plate is uniformly fixed with an outer partition plate, and the outer wall of the inner guide plate is uniformly fixed with an inner partition plate that matches the outer partition plate. The outer partition plate and the inner partition plate divide the drainage cavity to form a flow channel, and the outer end of the drainage cavity is a mixing cavity that is interconnected.

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