Centrifugal casting combined die

Abstract

The utility model discloses a centrifugal casting combined mold, and relates to the technical field of centrifugal casting, the mold comprises an outer mold and multiple inner molds embedded in the outer mold, the multiple inner molds are sequentially arranged in the axial direction of the outer mold, the contact faces of the adjacent inner molds abut against each other, grooves are formed in the outer circle faces of the inner molds in the axial direction, and the outer circle faces of the inner molds abut against the grooves. And the grooves in the adjacent inner molds are communicated. The machining efficiency of the inner mold can be improved, the inner mold can be easily assembled with the outer mold, and meanwhile the exhaust function is reserved.

Description

Technical Field

[0001] This application relates to the field of centrifugal casting technology, and in particular to a centrifugal casting combination mold. Background Technology

[0002] Centrifugal casting molds typically employ a sleeve-type combination mold, with venting achieved by drilling vent holes (01) in both the outer and inner molds. Please refer to the attached instruction manual. Figure 1 and Figure 2 The existing inner and outer molds have numerous small vent holes (01). This structure results in low mold processing efficiency. Furthermore, to improve venting performance, the central axes of the vent holes (01) on the outer and inner molds must align during assembly. Please refer to [reference needed]. Figure 2 and Figure 3 This caused great difficulties for assembly.

[0003] Therefore, in view of the above-mentioned technical problems, how to improve processing efficiency and facilitate assembly while retaining the exhaust function is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide a centrifugal casting combination mold that can improve the processing efficiency of the inner mold, is easy to assemble with the outer mold, and retains the venting function.

[0005] To achieve the above objectives, this application provides a centrifugal casting combined mold, including an outer mold and an inner mold embedded in the outer mold. The number of inner molds is multiple, and the multiple inner molds are arranged sequentially along the axial direction of the outer mold. The contact surfaces of adjacent inner molds abut against each other, and the outer circular surface of the inner mold is provided with a groove along the axial direction. The grooves on adjacent inner molds are connected.

[0006] Preferably, the outer edge of the end of the inner mold is provided with a circumferential chamfer, which forms an annular space with the cooperation of the inner mold and the outer mold, and the annular space is used to connect the grooves on the adjacent inner molds.

[0007] Preferably, the groove is a square groove, and multiple grooves are evenly distributed along the circumference of the inner mold.

[0008] Preferably, the inner mold at the casting end has an inner through hole in the radial direction, and the outer mold has an outer through hole corresponding to the position of the inner through hole. The outer through hole and the inner through hole are provided with positioning pins to limit the inner mold in the axial direction.

[0009] Preferably, the number of inner molds is two to three, and the axial length of each inner mold is 150mm to 200mm.

[0010] Preferably, the diameter of the inner through hole is larger than the diameter of the outer through hole.

[0011] Preferably, the outer circular surface of the inner mold is in close contact with the inner circular surface of the outer mold.

[0012] Preferably, the number of grooves on adjacent inner molds is the same, and their positions correspond one-to-one.

[0013] Preferably, one end of the groove in the inner mold at the pouring end is connected to the outside.

[0014] Preferably, the inner circular surface of the outer mold is provided with a shoulder, and the shoulder is axially limited with the inner mold opposite to the pouring end, so as to cooperate with the positioning pin to axially limit the multiple inner molds.

[0015] Compared to the aforementioned background technology, this application sets multiple inner molds in the outer mold. The contact surface of adjacent inner molds forms a gap for gas passage. During use, the gas generated in the coating can be directed outward along the contact surface of adjacent inner molds under centrifugal force and reach the groove position, thereby being discharged outward through the axially set groove. This can reduce or even avoid the formation of air holes. This structure is simple to process, low in cost, can improve the processing efficiency of the inner mold, is easy to assemble with the outer mold, and retains the venting function. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a longitudinal sectional view of an existing internal mold.

[0018] Figure 2 This is an assembly drawing of the inner and outer molds in the prior art;

[0019] Figure 3 for Figure 2 Sectional view along the BB direction;

[0020] Figure 4 This is a schematic diagram of the inner mold structure of the centrifugal casting combined mold provided in the embodiments of this application;

[0021] Figure 5 This is an assembly drawing of the outer mold and inner mold provided in the embodiments of this application;

[0022] Figure 6 for Figure 5 Sectional view along the AA direction.

[0023] In the diagram: 01 - Exhaust port;

[0024] 1-Inner mold; 11-Groove; 12-Outer chamfer; 13-Contact surface; 14-Inner through hole;

[0025] 2-Outer mold; 21-External through hole;

[0026] 3-Castings;

[0027] 4-Positioning pin. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0029] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 5 As shown, in this embodiment, a centrifugal casting combined mold is provided. The mold includes an outer mold 2 and an inner mold 1. The inner mold 1 is embedded in the outer mold 2. The outer mold 2 is an integral joint. There are multiple inner molds 1. The multiple inner molds 1 are arranged sequentially along the axial direction of the outer mold 2, and the contact surfaces 13 of adjacent inner molds 1 abut against each other.

[0032] In the process of processing the inner mold 1, the entire inner mold component can be cut into multiple parts, each cut part corresponds to an inner mold 1, and the cutting surface during cutting is a plane, so that the contact surface 13 of adjacent inner molds 1 is a planar structure.

[0033] It should be noted that the contact surfaces 13 of adjacent inner molds 1 do not achieve a sealing effect, that is, gas can flow through the gaps between the contact surfaces 13. Therefore, the gas generated in the coating will flow outward along the small gaps between the contact surfaces 13 under the action of centrifugal force.

[0034] A groove 11 is provided on the outer circular surface of the inner mold 1. Please refer to... Figure 4 and Figure 6 When the gas flows outward within the contact surface 13, it can reach the groove 11 and be discharged to the outside of the mold through the groove 11, replacing the traditional exhaust hole 01 exhaust method.

[0035] Meanwhile, the grooves 11 on adjacent inner molds 1 are connected, so that the grooves 11 on the inner mold 1 facing away from the pouring end can also allow gas to be discharged outside the mold through the mutual connection between the grooves 11.

[0036] In summary, this application provides multiple inner molds 1 within the outer mold 2. The contact surfaces 13 of adjacent inner molds 1 form gaps for gas passage. During use, the gas generated in the coating is directed outward along the contact surfaces 13 of adjacent inner molds 1 by centrifugal force and reaches the groove 11, where it is discharged outward through the axially arranged groove 11. This reduces or even eliminates the formation of air holes. The structure is simple to process, low in cost, improves the processing efficiency of the inner mold 1, is easy to assemble with the outer mold 2, and retains the venting function.

[0037] In some embodiments, the outer edge of the end of the inner mold 1 is provided with circumferentially distributed external chamfers 12. Please refer to... Figure 4 The outer chamfer 12 is a cutting part, and the size of the outer chamfer 12 can be 1.5*45°. Therefore, with the cooperation of the inner mold 1 and the outer mold 2, an annular space will be formed at the outer chamfer 12. This annular space can be used to connect the grooves 11 on the adjacent inner mold 1. Specifically, in the two adjacent inner molds 1, before the outer chamfer 12 of the first inner mold is formed, the length of the groove 11 should be consistent with the axial length of the first inner mold. After the outer chamfer 12 is processed, the annular space formed by the outer chamfer 12 will be connected with the end of the groove 11 on the first inner mold, and the end of the groove 11 on the adjacent second inner mold will also be connected with the groove 11 on the first inner mold, so that the grooves 11 on the adjacent inner molds 1 remain connected.

[0038] It should be noted that, due to the setting of the outer chamfer 12, the grooves 11 on the adjacent inner molds 1 can still remain connected even if their positions do not correspond, thus reducing the assembly difficulty of the inner molds 1.

[0039] In some embodiments, the groove 11 can be a square groove or an arc-shaped groove, without much limitation. In an inner mold 1, multiple grooves 11 are evenly distributed around the circumference of the inner mold 1, so that the gas flowing through the contact surface 13 can enter each groove 11 evenly, and the gas can be evenly discharged outward through multiple grooves 11, reducing the risk of blockage.

[0040] Please refer to Figure 4 and Figure 5 The inner mold 1 on the casting end side has an inner through hole 14 radially formed, and the outer mold 2 has an outer through hole 21 corresponding to the position of the inner through hole 14. After the inner mold 1 is inserted into the outer mold 2, the inner mold 1 and the outer mold 2 can be fixed axially by setting a positioning pin 4 in the outer through hole 21 and the inner through hole 14. The diameter of the inner through hole 14 can be larger than the diameter of the outer through hole 21, specifically, the diameter of the inner through hole 14 is 2-5mm larger than the diameter of the outer through hole 21, in order to facilitate the installation of the positioning pin 4.

[0041] After the positioning pin 4 is driven into the outer mold 2 and the inner mold 1, the positioning pin 4 needs to be embedded 5-10mm into the inner through hole 14. The purpose is to fix the inner mold 1 axially without obstructing the installation of the baffle plate at the pouring end of the inner mold, so as to prevent the inner mold 1 from being carried out when the casting 3 is demolded. At the same time, it can also avoid the risk of iron clamping caused by paint debris falling into the adjacent inner molds 1 due to loosening during cleaning.

[0042] It should be noted that the diameter parameters of the inner through hole 14 and the outer through hole 21, as well as the parameters for the positioning pin 4 to be embedded in the inner through hole 14, are only examples of this application. The parameters are not limited to the above parameters and can be set according to the actual situation. All of them fall within the protection scope of this application.

[0043] In some embodiments, the number of inner molds 1 should not be too many or too few, but should be appropriately set. Specifically, the number of inner molds 1 is two to three, and the axial length of each inner mold 1 is 150mm to 200mm. If the length of the inner mold 1 is greater than 200mm, the corresponding groove 11 is too long, resulting in a too long gas propagation path, which is not conducive to exhaust. If the length is less than 150mm, the number of inner molds 1 is too large, which is not conducive to installation. Of course, the length and number of inner molds 1 can also be selected according to the actual situation, and no further restrictions are imposed here.

[0044] When processing the inner mold 1, grooves 11 can be processed on the entire inner mold component first. The grooves 11 are symmetrically distributed along the circumference. Then, the inner mold component is cut into two or three inner molds, each inner mold 1 with a length of 150mm to 200mm. Finally, an outer chamfer 12 is processed on the inner mold 1.

[0045] Before pouring molten iron, the mold needs to be preheated at a temperature of 300-400℃. Since the inner mold 1 is heated better than the outer mold 2 during preheating, the inner mold 1 will expand more than the outer mold 2, thus making the outer surface of the inner mold 1 fit tightly with the inner surface of the outer mold 2.

[0046] In some embodiments, the number of grooves 11 on adjacent inner molds 1 can be the same and their positions correspond one-to-one, so that the gas flows more smoothly in the grooves 11 on adjacent inner molds 1.

[0047] In particular, one end of the groove 11 on the inner mold 1 at the casting end is connected to the outside. Please refer to... Figure 4 This allows the gas in the groove 11 to eventually be discharged from the mold through the groove 11 at the pouring end.

[0048] Additionally, please refer to Figure 5 A shoulder is provided on the inner circular surface of the outer mold 2. The shoulder is axially limited with the inner mold 1 away from the pouring end, so as to cooperate with the positioning pin 4 to axially limit multiple inner molds 1, ensuring the stability of the inner mold 1 and the outer mold 2.

[0049] During centrifugal casting, the gas generated in the coating, under the action of centrifugal force, first enters the outer chamfer 12 through the gap of the contact surface 13 of the adjacent inner mold 1, and then exits outward along the groove 11, avoiding the formation of pores. Compared with the traditional venting method of drilling vent holes 10, this mold is easier to process and has higher assembly efficiency. The design of the groove 11 and the outer chamfer 12 of this mold can also avoid the problem of clogging of the traditional vent holes 10 during use, resulting in better venting performance.

[0050] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0051] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A centrifugal casting assembly mold, characterized in that, It includes an outer mold (2) and an inner mold (1) embedded in the outer mold (2). There are multiple inner molds (1), and the multiple inner molds (1) are arranged sequentially along the axial direction of the outer mold (2). The contact surfaces (13) of adjacent inner molds (1) abut against each other. The outer circular surface of the inner mold is provided with a groove (11) along the axial direction. The grooves (11) on adjacent inner molds (1) are connected.

2. The centrifugal casting combination mold according to claim 1, characterized in that, The inner mold (1) has a circumferential chamfer (12) at its outer edge. The chamfer (12) forms an annular space with the cooperation of the inner mold (1) and the outer mold (2). The annular space is used to connect the groove (11) on the adjacent inner mold (1).

3. The centrifugal casting combination mold according to claim 1, characterized in that, The groove (11) is a square groove or an arc groove, and multiple grooves (11) are evenly distributed along the circumference of the inner mold (1).

4. The centrifugal casting combination mold according to claim 1, characterized in that, The inner mold (1) at the casting end has an inner through hole (14) in the radial direction, and the outer mold (2) has an outer through hole (21) corresponding to the position of the inner through hole (14). The outer through hole (21) and the inner through hole (14) are provided with positioning pins (4) to limit the inner mold (1) in the axial direction.

5. The centrifugal casting combination mold according to claim 1, characterized in that, The number of inner molds (1) is two to three, and the axial length of each inner mold (1) is 150mm to 200mm.

6. The centrifugal casting combination mold according to claim 4, characterized in that, The diameter of the inner through hole (14) is larger than the diameter of the outer through hole (21).

7. The centrifugal casting combination mold according to claim 1, characterized in that, The outer circular surface of the inner mold (1) is in close contact with the inner circular surface of the outer mold (2).

8. The centrifugal casting combination mold according to claim 1, characterized in that, The number of grooves (11) on adjacent inner molds (1) is the same, and their positions correspond one-to-one.

9. The centrifugal casting combination mold according to claim 1, characterized in that, One end of the groove (11) of the inner mold (1) at the casting end is connected to the outside.

10. The centrifugal casting assembly mold according to claim 4, characterized in that, The inner circular surface of the outer mold (2) is provided with a shoulder, which is axially limited to the inner mold (1) away from the pouring end, so as to cooperate with the positioning pin (4) to axially limit the multiple inner molds (1).

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