Centrifugal casting mold for large tin bronze pressure disc

Abstract

The utility model discloses a large-scale tin bronze pressure disc centrifugal casting mold, which belongs to the technical field of centrifugal casting, and comprises a mold assembly, a suspension plate, a pouring assembly and a guide pipe, the mold assembly is assembled on a vertical centrifugal casting machine, the suspension plate is suspended above the mold assembly, the pouring assembly is assembled on the lower surface of the suspension plate, and the guide pipe is arranged on the suspension plate. The cooling pipes are evenly arranged in the annular cavity of the outer mold, the total length of each set of cooling pipes is short, cooling capacity can be effectively provided to promote cooling of castings, the segregation phenomenon is effectively reduced, meanwhile, isometric crystals can be formed easily, the casting quality is improved, the casting quality is improved, and the casting quality is improved. In addition, by means of the designed pouring assembly and the designed guide pipe, molten metal can be shunted, even pouring can be achieved in the cavity, the flow speed of the molten metal is increased, the centrifugal rotating speed is matched, the retention time of the molten metal in the cavity is shortened, the lead phase sedimentation window is reduced, and the product quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal casting, and in particular provides a centrifugal casting mold for a large tin bronze pressure plate. Background Art

[0002] During the production of large tin-bronze pressure plates, high-lead bronze with a lead content of 14% to 16%, a typical self-lubricating bearing material, suffers from lead segregation, which directly impacts the mechanical properties and service life of the castings. Specifically, the density of lead is significantly higher than that of the copper matrix. In the molten state, the lead phase sinks rapidly due to gravity, forming segregation bands within the casting. Furthermore, the difference in melting points between copper and lead leads to asynchronous solidification, further exacerbating lead phase agglomeration and macrosegregation. Furthermore, the melting point of lead is much lower than that of copper, causing the copper matrix to preferentially form a dendritic framework during solidification. This expulsion of liquid lead into the interstitial spaces between grain boundaries exacerbates microstructural heterogeneity and ultimately leads to dispersed shrinkage. The addition of tin to the alloy expands the solidification temperature range, exacerbating the isolation of liquid metal between dendrites and forming closed microregions. During final cooling, the shrinkage of these localized regions cannot be effectively compensated, leading to stress concentration within the casting and potential crack formation. Furthermore, due to the heavy weight of the pressure plate, with the blank weighing 14 tons, uneven pouring of the liquid metal would affect the balanced operation of the centrifugal casting machine and product quality. Therefore, a large tin-bronze pressure plate centrifugal casting mold was needed that would ensure uniform pouring of the liquid metal and faster cooling. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a large tin bronze pressure plate centrifugal casting mold.

[0004] To achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: a large tin bronze pressure plate centrifugal casting mold, comprising a mold assembly, a hanging plate, a pouring assembly and a guide pipe, wherein the mold assembly is assembled on a vertical centrifugal casting machine, the hanging plate is suspended above the mold assembly, the pouring assembly is assembled on the lower surface of the hanging plate, cooling pipes are evenly installed on the mold assembly, and the cooling pipes are connected to the cooling water pipe through pipelines;

[0005] The casting assembly includes a liquid inlet pipe, an acceleration pipe, a liquid separation pipe and a plug. The upper end of the liquid inlet pipe is installed through the middle of the suspension plate, the acceleration pipe is fixedly installed at the lower end of the liquid inlet pipe, the liquid separation pipe is fixedly installed at the lower end of the acceleration pipe, and the plug is fixedly installed at the lower end of the liquid separation pipe. Liquid separation ports are evenly opened on the outer peripheral surface of the liquid separation pipe. The guide pipe is fixedly installed on the outer wall of the liquid separation pipe. The guide pipe is a spiral pipe, and the liquid outlet end of the guide pipe is lower than the liquid inlet end. The rotation direction of the guide pipe is the same as the rotation direction of the vertical centrifugal casting machine. The liquid inlet end of the guide pipe corresponds to the liquid separation port, and the liquid outlet end of the guide pipe faces the cavity of the mold assembly.

[0006] Furthermore, the mold assembly includes a mold pad, an outer mold, a core, a support body and an upper cover. The mold pad is assembled on a vertical centrifugal casting machine. The core and the outer mold are respectively assembled on the inner and outer sides of the upper surface of the mold pad. The support body is arranged on the outside of the outer mold, and the upper cover is fixedly installed on the support body. The upper cover is arranged above the outer mold.

[0007] Furthermore, an annular cavity is formed on the outer peripheral surface of the outer mold, and the cooling pipe is serpentinely assembled in the annular cavity, and the water inlet end and the water outlet end of the cooling pipe pass through the support body toward the outside.

[0008] Furthermore, liquid inlets are evenly opened on the upper surface of the upper cover, and guide covers corresponding to the liquid inlets are evenly fixedly installed on the upper surface of the upper cover, and the liquid outlet end of the guide pipe is located in the guide cover.

[0009] Furthermore, a support frame is fixedly installed on the lower surface of the suspension plate, and the guide pipe passes through the support frame, and the support frame is used to support the guide pipe. A hanging ring is fixedly installed on the upper surface of the suspension plate.

[0010] Furthermore, the accelerating tube is a conical tube, and the diameter of the lower end of the accelerating tube is smaller than the diameter of the upper end. A spiral guide plate is fixedly installed on the inner wall of the accelerating tube.

[0011] Furthermore, a conical drainage block is integrally formed on the upper surface of the plug.

[0012] Furthermore, the lower outer surface of the liquid inlet pipe, the upper and lower outer surfaces of the accelerating tube and the upper outer surface of the liquid separation pipe are all fixedly installed with connecting flanges, adjacent connecting flanges are fixedly connected by bolts and nuts, and sealing gaskets are installed between adjacent connecting flanges.

[0013] The beneficial effects of using the utility model are:

[0014] 1. The utility model evenly arranges serpentine-shaped cooling tubes in the annular cavity of the outer mold, and the total length of each group of cooling tubes is relatively short, which can effectively provide cooling capacity to promote cooling of the casting, effectively reduce segregation, and at the same time help form equiaxed grains and refine the microstructure.

[0015] 2. The utility model is designed with a pouring assembly and a guide pipe, which can divert the molten metal through the pouring assembly. Finally, each stream of molten metal flows from the guide pipe into the mold cavity, thereby achieving uniform pouring of the molten metal in the mold cavity and avoiding the formation of gravity deviation, which affects the balanced operation of the centrifugal casting machine and the product quality.

[0016] 3. The utility model can effectively increase the flow rate of the molten metal through the casting assembly. At the same time, the molten metal in the guide tube is affected by the spiral shape and gravity to further increase the flow rate, so that the speed of the molten metal can better match the rotation speed of the mold assembly, which can improve the stability of the casting process, shorten the residence time of the molten metal in the cavity, reduce the lead phase sedimentation window, and improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the present utility model.

[0018] Figure 2 It is a main sectional view of the present utility model.

[0019] Figure 3 It is a three-dimensional schematic diagram of the casting component of the utility model.

[0020] Figure 4 This is a front sectional view of the casting assembly of the utility model.

[0021] Figure 5 It is a three-dimensional schematic diagram of the guide tube of the present utility model.

[0022] Figure 6 It is a three-dimensional schematic diagram of the cooling pipe of the utility model.

[0023] Figure 7 This is a schematic diagram of a large tin bronze pressure plate product of the present utility model.

[0024] The reference numerals include: 1. mold assembly, 11. mold pad, 12. outer mold, 13. core, 14. support body, 15. upper cover, 151. guide cover, 2. hanging plate, 21. support frame, 22. hanging ring, 3. pouring assembly, 31. liquid inlet pipe, 32. acceleration tube, 321. spiral guide plate, 33. liquid separation pipe, 331. liquid separation port, 34. plug, 341. conical drainage block, 35. sealing gasket, 4. guide pipe, 5. cooling pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Reference Figures 1 to 6 A large tin bronze pressure plate centrifugal casting mold includes a mold assembly 1, a hanging plate 2, a pouring assembly 3 and a guide pipe 4. The mold assembly 1 is assembled on a vertical centrifugal casting machine, and the hanging plate 2 is suspended above the mold assembly 1. The lower surface of the hanging plate 2 is equipped with a pouring assembly 3. Cooling pipes 5 are evenly installed on the mold assembly 1, and the cooling pipes 5 are connected to the cooling water pipe through a pipeline.

[0027] like Figure 7 As shown, for this large tin bronze pressure plate product, the weight of the casting blank can reach 14 tons.

[0028] The molten metal flows in from the pouring assembly 3 , is accelerated and diverted by the pouring assembly 3 , and then flows into the cavity of the mold assembly 1 through the guide pipe 4 .

[0029] The cooling pipe 5 is used to increase the cooling rate of the casting.

[0030] like Figure 3 and Figure 4 As shown, the casting assembly 3 includes a liquid inlet pipe 31, an accelerating pipe 32, a liquid separation pipe 33 and a plug 34. The upper end of the liquid inlet pipe 31 is installed through the middle of the suspension plate 2, the accelerating pipe 32 is fixedly installed at the lower end of the liquid inlet pipe 31, the liquid separation pipe 33 is fixedly installed at the lower end of the accelerating pipe 32, and the plug 34 is fixedly installed at the lower end of the liquid separation pipe 33. Liquid separation ports 331 are evenly opened on the outer peripheral surface of the liquid separation pipe 33. The guide pipe 4 is fixedly installed on the outer wall of the liquid separation pipe 33. The guide pipe 4 is a spiral pipe, and the liquid outlet end of the guide pipe 4 is lower than the liquid inlet end. The rotation direction of the guide pipe 4 is the same as the rotation direction of the vertical centrifugal casting machine. The liquid inlet end of the guide pipe 4 corresponds to the liquid separation port 331, and the liquid outlet end of the guide pipe 4 faces the cavity of the mold assembly 1.

[0031] There are six liquid dispensing ports 331 on the liquid dispensing tube 33 , and six guide tubes 4 are also provided.

[0032] The molten metal is injected from the upper end of the liquid inlet pipe 31, and the flow rate is increased when flowing through the acceleration pipe 32. It is divided at the liquid separation pipe 33, flows out from the liquid separation port 331 and falls into the guide pipe 4, and then flows into the cavity of the mold assembly 1 through the guide pipe 4.

[0033] like Figure 2 and Figure 5As shown, the structural design of the spiral tube of the guide tube 4 enables the liquid outlet end of the guide tube 4 to guide the molten metal to flow into the mold cavity in a tangential direction, and the height difference between the liquid inlet end and the liquid outlet end can further increase the flow rate of the molten metal, making the flow rate of the molten metal closer to the rotation speed of the centrifugal casting machine, which can improve the stability of the casting process, shorten the residence time of the molten metal in the mold cavity, reduce the lead phase sedimentation window, and improve product quality.

[0034] The guide tube 4 includes an inner tube and an outer tube, both of which are spiral tubes. The diameter of the inner tube is smaller than that of the outer tube, and the inner tube is inserted into the outer tube. A gap is left between the inner tube and the outer tube. A heating component or an insulation component is set in the gap to maintain the temperature of the molten metal. If it is set as a heating component, such as an electric heating wire, the outlet temperature of the guide tube 4 can be controlled by adjusting the power, so that the temperature of the molten metal entering the mold cavity is within the set range, thereby improving the quality of the finished product.

[0035] The liquid inlet end of the guide tube 4 is provided with a connecting end with an arc-shaped surface at one end, which is installed on the outer wall of the liquid separation tube 33, and the other end of the connecting end is fixed on the inner tube and the outer tube. The connecting end can prevent the metal liquid from flowing into the gap between the inner tube and the outer tube.

[0036] The size, spiral degree, etc. of the guide tube 4 can be replaced according to actual conditions.

[0037] Specifically, if Figure 1 and Figure 2 As shown, the mold assembly 1 includes a mold pad 11, an outer mold 12, a core 13, a support body 14 and an upper cover 15. The mold pad 11 is assembled on a vertical centrifugal casting machine. The core 13 and the outer mold 12 are respectively assembled on the inner and outer sides of the upper surface of the mold pad 11. The support body 14 is arranged on the outer side of the outer mold 12, and the upper cover 15 is fixedly installed on the support body 14. The upper cover 15 is arranged above the outer mold 12.

[0038] The space between the upper side of the mold pad 11 and the outer mold 12 and the core 13 is the mold cavity. These three rotate with the centrifugal casting machine. The support body 14 and the upper cover 15 are fixed, and a gap is left between the upper cover 15 and the outer mold 12.

[0039] Specifically, if Figure 2 and Figure 6 As shown, an annular cavity is formed on the outer peripheral surface of the outer mold 12, and the cooling pipe 5 is serpentinely assembled in the annular cavity, and the water inlet and outlet ends of the cooling pipe 5 pass through the support body 14 toward the outside.

[0040] Since the water inlet and outlet ends of the cooling pipe 5 are arranged on the support body 14 , the position of the cooling pipe 5 is fixed, and the cooling is completed by providing cold energy to the internal casting through the rotating outer mold 12 .

[0041] like Figure 1 and Figure 6 As shown, it can be seen that the support body 14 is composed of a plurality of support blocks, which are arc-shaped blocks, and there are twelve of them in total. The angle corresponding to each support block is 30°, and the twelve support blocks form a cylindrical tube structure to support the upper cover 15; each support block is provided with a cooling pipe 5, and the cooling pipe 5 is serpentinely distributed, and the corresponding range is the range of 30° angle in the annular cavity. A total of twelve cooling pipes 5 are distributed in an annular manner. Arranging as multiple groups of cooling pipes 5 can shorten the flow length of the cooling water for heat exchange cooling work, and can maintain the temperature of the cooling water in each cooling pipe 5 not being too high, thereby providing more effective cooling.

[0042] The cooling water may flow into the cooling pipe 5 from the upper end and out from the lower end, or may flow into the cooling pipe 5 from the lower end and out from the lower end. When distributed, the cooling pipes 5 with the above two cooling water flow modes are staggered, which can uniformly cool the casting in the rotating outer mold 12.

[0043] Specifically, if Figure 1 As shown, liquid inlets are uniformly opened on the upper surface of the upper cover 15 , and guide covers 151 corresponding to the liquid inlets are uniformly fixedly installed on the upper surface of the upper cover 15 , and the liquid outlet end of the guide tube 4 is located in the guide cover 151 .

[0044] The guide cover 151 is provided to ensure that the molten metal can flow directly into the mold cavity after flowing out of the guide tube 4 without splashing. The guide cover 151 has only rounded corners to reduce the impact on the flow rate of the molten metal.

[0045] Specifically, if Figure 1 and Figure 2 As shown, a support frame 21 is fixedly installed on the lower surface of the suspension plate 2, and the guide tube 4 passes through the support frame 21. The support frame 21 is used to support the guide tube 4. A hanging ring 22 is fixedly installed on the upper surface of the suspension plate 2.

[0046] Two groups of support frames 21 are provided on the lower surface of the suspension plate 2 , which are respectively located on the inner circle and the outer circle of the lower surface of the suspension plate 2 , so as to better support the guide tube 4 .

[0047] The hanging plate 2, the pouring assembly 3 and the guide pipe 4 can be lifted by the lifting ring 22, and the pouring work can be carried out after the guide pipe 4 is controlled to align with the guide cover 151.

[0048] Specifically, if Figure 3 and Figure 4 As shown, the accelerating tube 32 is a tapered tube, and the diameter of the lower end of the accelerating tube 32 is smaller than the diameter of the upper end. A spiral guide plate 321 is fixedly installed on the inner wall of the accelerating tube 32.

[0049] The conical tube structure of the accelerating tube 32 can effectively increase the flow rate of the molten metal. The installation of the spiral guide plate 321 can guide the flow direction of the molten metal and form a laminar flow, thereby suppressing the generation of turbulence. The spiral guide plate 321 can also force the molten metal to rotate, thereby helping to release the internal mixed gas in advance.

[0050] Specifically, if Figure 4 As shown, a conical drainage block 341 is integrally formed on the upper surface of the plug 34 .

[0051] The design of the conical guide block 341 can significantly reduce the obstruction to the molten metal, allowing the molten metal to be smoothly diverted when flowing downward, thereby reducing speed loss.

[0052] Specifically, if Figure 3 and Figure 4 As shown, the outer surface of the lower end of the liquid inlet pipe 31, the upper and lower outer surfaces of the accelerating tube 32 and the outer surface of the upper end of the liquid distribution pipe 33 are all fixedly installed with connecting flanges, and adjacent connecting flanges are fixedly connected by bolts and nuts, and sealing gaskets 35 are installed between adjacent connecting flanges.

[0053] The sealing gasket 35 is a graphite sealing gasket, which seals the connection between the liquid inlet pipe 31, the acceleration pipe 32 and the liquid distribution pipe 33.

[0054] The use of this large tin bronze pressure plate centrifugal casting mold is as follows:

[0055] First, install the mold assembly 1, the mold pad 11, the outer mold 12, and the core. Then, assemble them and install them on the vertical centrifugal casting machine. After the support body 14 is assembled and formed, it is placed outside the outer mold 12. The cooling pipe 5 is placed in the annular cavity, and the upper cover 15 is installed on the support body 14.

[0056] After the suspension plate 2 is suspended and the guide tubes 4 are installed, the suspension plate 2 is moved above the mold assembly 1, and it is lowered and deflected so that each guide tube 4 is inserted into the corresponding guide cover 151;

[0057] The vertical centrifugal casting machine is operated. After the mold pad 11, the outer mold 12, and the core 13 reach the set speed, the molten metal is injected into the casting assembly 3. The molten metal is first accelerated by the acceleration tube 32, and then divided at the liquid separation tube 33 and flows into the guide tube 4. The guide tube 4 adjusts the flow direction of the molten metal so that the molten metal flows into the mold cavity in a tangential direction and maintains the temperature of the molten metal. At the same time, the guide tube 4 further increases the flow rate of the molten metal so that the flow rate of the molten metal can better match the speed of the mold assembly 1.

[0058] After the pouring is completed, the vertical centrifugal casting machine is continued to operate, and the coolant in the cooling pipe 5 is used to cool the molten metal until the casting work is finally completed;

[0059] The casting is then taken out and surface treated to obtain the final product.

[0060] The above content is only a preferred embodiment of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scope based on the concept of the present invention. As long as these changes do not deviate from the concept of the present invention, they all fall within the scope of protection of the present invention.

Claims

1. A centrifugal casting mold for a large tin bronze pressure plate, characterized by: The invention comprises a mold assembly, a hanging plate, a pouring assembly and a guide pipe. The mold assembly is assembled on a vertical centrifugal casting machine. The hanging plate is suspended above the mold assembly. The pouring assembly is assembled on the lower surface of the hanging plate. Cooling pipes are evenly installed on the mold assembly, and the cooling pipes are connected to the cooling water pipe through pipelines. The casting assembly includes a liquid inlet pipe, an acceleration pipe, a liquid separation pipe and a plug. The upper end of the liquid inlet pipe is installed through the middle of the suspension plate, the acceleration pipe is fixedly installed at the lower end of the liquid inlet pipe, the liquid separation pipe is fixedly installed at the lower end of the acceleration pipe, and the plug is fixedly installed at the lower end of the liquid separation pipe. Liquid separation ports are evenly opened on the outer peripheral surface of the liquid separation pipe. The guide pipe is fixedly installed on the outer wall of the liquid separation pipe. The guide pipe is a spiral pipe, and the liquid outlet end of the guide pipe is lower than the liquid inlet end. The rotation direction of the guide pipe is the same as the rotation direction of the vertical centrifugal casting machine. The liquid inlet end of the guide pipe corresponds to the liquid separation port, and the liquid outlet end of the guide pipe faces the cavity of the mold assembly.

2. A large tin bronze pressure plate centrifugal casting mold according to claim 1, characterized in that: The mold assembly includes a mold pad, an outer mold, a core, a support body and an upper cover. The mold pad is assembled on a vertical centrifugal casting machine. The core and the outer mold are respectively assembled on the inner and outer sides of the upper surface of the mold pad. The support body is arranged on the outer side of the outer mold, and the upper cover is fixedly installed on the support body. The upper cover is arranged above the outer mold.

3. A centrifugal casting mold for a large tin bronze pressure plate according to claim 2, characterized in that: An annular cavity is formed on the outer peripheral surface of the outer mold, and a cooling pipe is serpentinely assembled in the annular cavity. The water inlet end and the water outlet end of the cooling pipe penetrate the support body toward the outside.

4. A centrifugal casting mold for a large tin bronze pressure plate according to claim 2, characterized in that: Liquid inlets are evenly opened on the upper surface of the upper cover, and guide covers corresponding to the liquid inlets are evenly fixedly installed on the upper surface of the upper cover, and the liquid outlet end of the guide pipe is located in the guide cover.

5. The centrifugal casting mold for a large tin bronze pressure plate according to claim 1, characterized in that: A support frame is fixedly installed on the lower surface of the suspension plate, and the guide pipe passes through the support frame. The support frame is used to support the guide pipe. A hanging ring is fixedly installed on the upper surface of the suspension plate.

6. A centrifugal casting mold for a large tin bronze pressure plate according to claim 1, characterized in that: The accelerating tube is a conical tube, and the diameter of the lower end of the accelerating tube is smaller than the diameter of the upper end. A spiral guide plate is fixedly installed on the inner wall of the accelerating tube.

7. The centrifugal casting mold for a large tin bronze pressure plate according to claim 1, characterized in that: A conical drainage block is integrally formed on the upper surface of the plug.

8. The centrifugal casting mold for a large tin bronze pressure plate according to claim 1, characterized in that: The lower end outer surface of the liquid inlet pipe, the upper and lower end outer surfaces of the accelerating tube and the upper end outer surface of the liquid separation pipe are all fixedly installed with connecting flanges. Adjacent connecting flanges are fixedly connected by bolts and nuts, and sealing gaskets are installed between adjacent connecting flanges.

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