Split type top die structure

Abstract

The utility model relates to the technical field of hub casting molds, and discloses a split type top mold structure which comprises a top mold body, the top mold body is divided corresponding to a rim part of a hub casting to form a split type structure comprising an upper mold and a lower mold, and isolation tables used for supporting the upper mold are arranged on the upper end face of the lower mold at intervals in the circumferential direction. And an exhaust gap for exhausting is formed between the upper die and the lower die. The top die is arranged in a split mode, the upper die and the lower die can be machined and manufactured independently, manufacturing of cooling structures such as an air pipe and a water way is facilitated, and the manufacturing cost of the hub die is reduced; the arrangement of the exhaust seam is beneficial to smooth exhaust of air at the rim part, and the defects of air holes, insufficient casting, flow marks and the like at the rim part of the hub casting are avoided; the positioning structure improves the assembly precision of the top die, ensures the casting quality, ensures the accurate alignment of a bolt hole and a threaded hole, and improves the assembly efficiency; and due to the arrangement of the negative pressure cavity, the exhaust efficiency is improved, and gas in the cavity is exhausted more thoroughly.

Description

Technical Field

[0001] The utility model relates to the technical field of wheel hub casting molds, in particular to a split top mold structure. Background Art

[0002] Aluminum alloy wheel casting molds usually include top molds, side molds and bottom molds. During casting, the top mold, side molds and bottom molds are combined to form a wheel casting cavity. Aluminum liquid is filled into the cavity through the riser to complete the filling process. During the filling process, the aluminum liquid is prone to entrain air, resulting in pores on the wheel casting, and is prone to defects such as insufficient pouring and flow marks, which affect the casting quality. In order to overcome the above problems, a corresponding exhaust structure is usually required on the mold to allow the entrained air to be discharged from the cavity, thereby improving defects such as pores, insufficient pouring and flow marks in the casting.

[0003] In existing molds, the top mold is usually an integrated structure, which is not conducive to smooth exhaust, especially in the rim area, where large pores are easily formed, and flow mark defects occur, causing product scrapping. At the same time, the top mold with an integrated structure is not convenient for the layout of cooling structures such as air ducts and water channels, and the design and production cost of the top mold is high.

[0004] Based on this, developing a split top mold structure for application in actual production is an urgent problem to be solved. Utility Model Content

[0005] The purpose of the utility model is to provide a split top mold structure in view of the above problems, so as to solve the problem that the existing one-piece top mold is prone to defects such as air holes, insufficient pouring, flow marks, etc., which affect the casting quality, and at the same time solve the problem that the existing one-piece top mold is not convenient for the layout of cooling structures such as air ducts and water channels, and the design and production cost is high.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A split top mold structure comprises a top mold body, wherein the top mold body is divided corresponding to the rim portion of a hub casting to form a split structure comprising an upper mold and a lower mold.

[0008] Preferably, a venting gap is provided between the upper die and the lower die to facilitate the smooth venting of the rim area, and the upper end surface of the lower die is provided with isolation platforms for supporting the upper die at intervals along the circumferential direction, so that a venting gap for venting is formed between the upper die and the lower die.

[0009] Preferably, the upper die and the lower die are connected and fixed by fixing bolts to form a top die as a whole. The upper die and the lower die are provided with bolt holes and threaded holes respectively, and the lower die is fixedly provided with a support seat corresponding to the upper die, and the threaded holes are provided on the support seat.

[0010] Preferably, a positioning stop is provided on the lower die, a positioning ring platform is provided on the upper die corresponding to the positioning stop, and an avoidance groove is provided on the positioning stop corresponding to the isolation platform to ensure that the exhaust seam channel is unobstructed.

[0011] Preferably, the upper die and the lower die are provided with pin holes correspondingly, and positioning effects are inserted into the pin holes for positioning the radial assembly angle of the upper die and the lower die.

[0012] Preferably, a negative pressure cavity is provided in the back cavity of the top mold body corresponding to the exhaust slit, and the negative pressure cavity is an annular cavity structure connected to the exhaust slit, and the negative pressure cavity is connected to a negative pressure device.

[0013] Preferably, the negative pressure device comprises a negative pressure generating chamber, which is respectively connected to the negative pressure cavity and the compression air duct, and the end of the compression air duct crosses the connecting pipe of the negative pressure cavity in the negative pressure generating chamber and faces the air outlet.

[0014] Preferably, the height of the exhaust slit is 0.1-0.2 mm.

[0015] The beneficial effects of the utility model are:

[0016] The utility model sets the top mold separately, and during the mold making process, the upper mold and the lower mold can be processed and made separately, which is convenient for the production of cooling structures such as air ducts and water channels, and reduces the production cost of the hub mold; the setting of the exhaust seam is conducive to the smooth exhaust of air in the rim area, avoiding defects such as air holes, insufficient pouring and flow marks in the rim area of ​​the hub casting; the setting of the positioning ring, the positioning stop and the positioning pin improves the assembly accuracy of the top mold body, ensures the casting quality, and at the same time ensures the accurate alignment of the bolt hole and the threaded hole, thereby improving the assembly efficiency; the setting of the negative pressure cavity improves the exhaust efficiency, and makes the gas in the cavity more thoroughly discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0020] In the figure: 1--top mold body; 11--upper mold; 12--lower mold; 13--exhaust gap; 14--isolation platform; 15--bolt hole; 16--threaded hole; 17--support seat; 18--positioning ring platform; 19--pin hole; 2--negative pressure chamber; 21--negative pressure device; 22--negative pressure generating chamber; 23--compression air duct; 24--connecting pipe; 25--air outlet.

[0021] The arrows in the figure indicate the direction of gas flow. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] like Figure 1-2 As shown, a split top mold structure includes a top mold body 1, and the top mold body 1 is divided corresponding to the rim portion of the wheel hub casting to form a split structure including an upper mold 11 and a lower mold 12. During the manufacturing process of the split top mold, the upper mold 11 and the lower mold 12 can be processed and manufactured separately, which facilitates the manufacturing of cooling structures such as air ducts and water channels, and reduces the manufacturing cost of the wheel hub mold.

[0024] As a preferred embodiment, an exhaust slit 13 is provided between the upper die 11 and the lower die 12 to facilitate the smooth exhaust of the wheel rim. The upper end surface of the lower die 12 is provided with isolation platforms 14 for supporting the upper die 11 at intervals along the circumferential direction, so that an exhaust slit 13 for exhaust is formed between the upper die 11 and the lower die 12. The provision of the exhaust slit 13 facilitates the smooth exhaust of air at the wheel rim, avoiding defects such as air holes, insufficient pouring and flow marks at the wheel rim of the hub casting.

[0025] The upper die 11 and the lower die 12 are connected and fixed by fixing bolts to form a top die as a whole. The upper die 11 and the lower die 12 are provided with bolt holes 15 and threaded holes 16 respectively, and the lower die 12 is fixedly provided with a support seat 17 corresponding to the upper die 11, and the threaded holes 16 are provided on the support seat 17 to facilitate the connection and fixation of the upper die 11 and the lower die 12.

[0026] Furthermore, a positioning stop is provided on the lower die 12, a positioning ring 18 is provided on the upper die 11 corresponding to the positioning stop, and an avoidance groove is provided on the positioning stop corresponding to the isolation platform 14 to ensure that the exhaust slit 13 is unobstructed. The provision of the positioning stop and the positioning ring 18 improves the assembly accuracy of the upper die 11 and the lower die 12.

[0027] Furthermore, pin holes 19 are correspondingly opened on the upper mold 11 and the lower mold 12, and a positioning effect is inserted in the pin hole 19 for positioning the radial assembly angle of the upper mold 11 and the lower mold 12, further improving the assembly accuracy of the top mold body 1, ensuring the precise alignment of the bolt hole 15, and improving the assembly efficiency.

[0028] Preferably, if Figure 2 As shown, the back cavity of the top mold body 1 is provided with a negative pressure cavity 2 corresponding to the exhaust slit 13, and the negative pressure cavity 2 is an annular cavity structure connected to the exhaust slit 13. The negative pressure cavity 2 is connected to the negative pressure device 21, and a negative pressure of a certain pressure is formed in the annular cavity and the exhaust slit 13. During operation, the gas discharged from the exhaust slit 13 enters the negative pressure cavity 2 and is efficiently discharged under the action of the negative pressure device 21. The setting of the negative pressure cavity 2 improves the exhaust efficiency and makes the gas in the cavity more thoroughly discharged.

[0029] The negative pressure device 21 can be a conventional negative pressure pump, or a simple negative pressure device 21 can be made with the help of a mold cooling air duct, which includes a negative pressure generating chamber 22, and the negative pressure generating chamber 22 is respectively connected to the negative pressure cavity 2 and the compression air duct 23, and the end of the compression air duct 23 crosses the connecting pipe 24 of the negative pressure cavity 2 in the negative pressure generating chamber 22 and faces the air outlet 25. When in use, the compression air duct 23 is connected to the cooling air duct to supply compressed air to the negative pressure generating chamber 22, and the compressed air generates negative pressure in the negative pressure generating chamber 22 to suck the gas in the negative pressure cavity 2, and is discharged together through the air outlet 25. The configuration of the simple negative pressure device 21 reduces the manufacturing cost and ensures the exhaust efficiency of the top mold body 1.

[0030] Preferably, the height of the exhaust slit 13 is 0.1-0.2 mm, which ensures smooth exhaust while avoiding aluminum leakage.

[0031] The above disclosure is only a specific embodiment of the present patent, but the present patent is not limited thereto. For ordinary technicians in this field, without departing from the principle of the present invention, the deformation made should be deemed to belong to the protection of the present invention.

Claims

1. A split top mold structure, characterized in that: The invention comprises a top mold body (1), wherein the top mold body (1) is divided corresponding to the rim portion of the wheel hub casting to form a split structure comprising an upper mold (11) and a lower mold (12); an exhaust slit (13) is provided between the upper mold (11) and the lower mold (12); and an isolation platform (14) for supporting the upper mold (11) is provided at intervals along the circumferential direction on the upper end surface of the lower mold (12), so that an exhaust slit (13) for exhaust is formed between the upper mold (11) and the lower mold (12).

2. A split top mold structure according to claim 1, characterized in that: The upper die (11) and the lower die (12) are connected and fixed by fixing bolts to form a top die as a whole; the upper die (11) and the lower die (12) are provided with bolt holes (15) and threaded holes (16) respectively; the lower die (12) is fixedly provided with a support seat (17) corresponding to the upper die (11); and the threaded holes (16) are provided on the support seat (17).

3. A split top mold structure according to claim 1, characterized in that: The lower die (12) is provided with a positioning stop, the upper die (11) is provided with a positioning ring platform (18) corresponding to the positioning stop, and the positioning stop is provided with an avoidance groove corresponding to the isolation platform (14).

4. A split top mold structure according to claim 1, characterized in that: The upper die (11) and the lower die (12) are provided with corresponding pin holes (19), and the pin holes (19) are inserted with positioning functions for positioning the radial assembly angle of the upper die (11) and the lower die (12).

5. The split top mold structure according to claim 1, characterized in that: A negative pressure chamber (2) is provided in the back cavity of the top mold body (1) corresponding to the exhaust slit (13); the negative pressure chamber (2) is an annular cavity structure connected to the exhaust slit (13); and the negative pressure chamber (2) is connected to a negative pressure device (21).

6. A split top mold structure according to claim 5, characterized in that: The negative pressure device (21) comprises a negative pressure generating chamber (22), wherein the negative pressure generating chamber (22) is respectively connected to the negative pressure cavity (2) and the compression air duct (23), wherein the end of the compression air duct (23) crosses the connecting pipe (24) of the negative pressure cavity (2) in the negative pressure generating chamber (22) and faces the air outlet (25).

7. The split top mold structure according to claim 1, characterized in that: The height of the exhaust slit (13) is 0.1-0.2 mm.

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