Knuckle mold for counter-pressure casting

Abstract

The utility model provides a steering knuckle mold for counter-pressure casting, which solves the technical problems that the exhaust effect becomes poor due to the fact that pressure exists on the upper part and the lower part of a cavity of the existing mold and an exhaust device is blocked in the forming process, and a product has cold shut due to the fact that gas cannot well overflow from a casting. The method can be widely applied to the field of knuckle machining dies; the mold specifically comprises an upper mold body and a lower mold body, an injection molding hole is formed in the upper mold body, the upper mold body and the lower mold body are each provided with a steering knuckle injection molding area, the steering knuckle injection molding areas jointly form the shape of a steering knuckle, a side wall protruding upwards is arranged on the periphery of the steering knuckle injection molding area of the lower mold body in a surrounding mode, and an inwards-concave area matched with the side wall is arranged on the upper mold body. A flange is arranged around the periphery of the inner concave area; a plurality of exhaust holes are further formed in the lower die, limiting rings with the diameter smaller than that of the exhaust holes are arranged in the exhaust holes, the filling rod is used for filling the exhaust holes, and the filling rod is divided into a thick part and a thin part.

Description

Technical Field

[0001] The utility model belongs to the technical field of steering knuckle processing moulds, in particular to a steering knuckle mould for differential pressure casting. Background Art

[0002] The steering knuckle is one of the main parts of the steering axle of the car. It can make the car run stably and transmit the driving direction sensitively. The function of the steering knuckle is to bear the front load of the car, support and drive the front wheel to rotate around the kingpin to turn the car. When the car is running, it is subjected to variable impact loads, so it is required to have high strength.

[0003] Differential pressure casting is the latest process equipment for casting aluminum steering knuckles. The differential pressure casting pouring process uses a bottom injection mode. The exhaust device used in the existing differential pressure casting mold is to set an exhaust duct on the parting surface, or install a push rod for exhaust. Since there is pressure on both the upper and lower sides of the mold cavity and the filling speed is fast, the exhaust device mentioned above will be blocked during the molding process, resulting in poor exhaust effect. Castings often have cold shuts due to the inability of the gas to overflow well. Since cold shuts are difficult to detect, the casting process often requires adding multiple processes to inspect the appearance of the cold shuts.

[0004] Therefore, designing an anti-leakage aluminum structure suitable for differential pressure casting molds is a key technical means to solve the aluminum leakage problem of traditional technology. Utility Model Content

[0005] The utility model aims to solve the deficiencies of the above-mentioned technology and provides a steering knuckle mold for differential pressure casting.

[0006] To this end, the utility model provides a steering knuckle mold for differential pressure casting, including an upper mold and a lower mold, the upper mold is provided with an injection hole, and the upper mold and the lower mold are both provided with steering knuckle injection areas, which together form the shape of the steering knuckle, the steering knuckle injection area of ​​the lower mold is surrounded by an upwardly protruding side wall, the upper mold is provided with an inner concave area matching the side wall, and the inner concave area is surrounded by a retaining edge.

[0007] Furthermore, the side wall height is 3-5 mm.

[0008] Furthermore, a plurality of exhaust holes are provided on the lower mold, and a limiting ring having a diameter smaller than that of the exhaust hole is provided in the exhaust hole.

[0009] Furthermore, it also includes a filling rod, which is used to fill the exhaust hole. The filling rod is divided into two parts, a thick part and a thin part. The diameter of the thin part is the same as that of the limiting ring, and the length is the same as the distance from the limiting ring to the inner surface of the lower mold; the diameter of the thick part is the same as that of the exhaust hole, and the length is greater than the distance from the limiting ring to the outer surface of the lower mold.

[0010] Furthermore, it also includes a push rod, the diameter of which is smaller than the diameter of the limiting ring.

[0011] Furthermore, the draft angle of the inner side wall of the side wall is 3 degrees.

[0012] The utility model provides a steering knuckle mold for differential pressure casting, which has the following beneficial effects:

[0013] By setting up side walls and using this anti-leakage aluminum trough design 3-5 mm higher than the product parting surface, the occurrence of aluminum leakage can be effectively reduced, and the damage to the casting machine and the mold caused by aluminum leakage can be reduced, reducing the workload of on-site employees. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 This is the internal structure diagram of the lower mold of the utility model;

[0016] Figure 3 It is the external structure diagram of the lower mold of the utility model;

[0017] Figure 4 It is the internal structure diagram of the upper mold of the utility model;

[0018] Figure 5 yes Figure 3 The enlarged view of point A in the middle;

[0019] Markings in the figure: 1. upper mold; 2. lower mold; 3. injection hole; 4. side wall; 5. retaining edge; 6. exhaust hole; 7. limiting ring; 8. steering knuckle injection area; 9. concave area. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercial products unless otherwise specified.

[0021] like Figure 1-4 As shown, the utility model provides a steering knuckle mold for differential pressure casting, including an upper mold 1 and a lower mold 2, wherein an injection hole 3 is provided on the upper mold 1, and a steering knuckle injection molding area 8 is provided on both the upper mold 1 and the lower mold 2, which together form the shape of the steering knuckle. The steering knuckle injection molding area 8 of the lower mold 2 is surrounded by an upwardly protruding side wall 4, and the height of the side wall 4 is 4 mm. The upper mold 1 is provided with an inner concave area 9 matched with the side wall 4, and a retaining edge 5 is provided around the outer periphery of the inner concave area 9. By providing the side wall 4 and the retaining edge 5, it is possible to effectively prevent the aluminum liquid from splashing to the outside of the mold and causing obstacles to the work of the employees.

[0022] like Figure 3 As shown in Figure 5, a plurality of exhaust holes 6 are also provided on the lower mold 2, and a limiting ring 7 with a diameter smaller than that of the exhaust hole 6 is provided in the exhaust hole 6; during injection molding, a filling rod is required to fill the exhaust hole 6. The filling rod is divided into two parts, a thick part and a thin part. The diameter of the thin part is the same as that of the limiting ring 7, and the length is the same as the distance from the limiting ring 7 to the inner surface of the lower mold 2; the diameter of the thick part is the same as that of the exhaust hole 6, and the length is greater than the distance from the limiting ring 7 to the outer surface of the lower mold 2. Through the above-mentioned arrangement, it is ensured that the filling rod can perfectly fill the exhaust hole 6 during injection molding to prevent the injection molding shape of the steering knuckle; the part of the filling rod that is longer than the exhaust hole 6 can facilitate the assembly and disassembly of the filling rod. By setting the limiting ring 7, the filling rod can be quickly positioned when assembling to prevent defects when filling the exhaust hole 6.

[0023] After the injection molding is completed, the filling rod is removed from the exhaust hole 6, and when the mold is removed, the molded steering knuckle is pushed out from the steering knuckle injection molding area 8 through the exhaust hole 6 through the ejector rod. The diameter of the ejector rod is smaller than the diameter of the limit ring 7.

[0024] The draft angle of the inner side wall of the side wall 4 is 3 degrees, which can facilitate demolding of the upper mold 1 and the lower mold 2 and also facilitate mold processing.

[0025] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0026] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A steering knuckle mold for differential pressure casting, comprising an upper mold and a lower mold, wherein the upper mold is provided with an injection hole, and the upper mold and the lower mold are both provided with a steering knuckle injection area, which together form the shape of the steering knuckle, characterized in that: The steering knuckle injection molding area of ​​the lower mold is surrounded by an upwardly protruding side wall, the upper mold is provided with an inner concave area matched with the side wall, and the inner concave area is surrounded by a retaining edge.

2. A steering knuckle mold for differential pressure casting according to claim 1, characterized in that: The side wall height is 3-5 mm.

3. A steering knuckle mold for differential pressure casting according to claim 1 or 2, characterized in that: The lower mold is also provided with a plurality of exhaust holes, and the exhaust holes are provided with limiting rings with a diameter smaller than that of the exhaust holes.

4. A differential pressure casting steering knuckle mold according to claim 3, characterized in that: It also includes a filling rod, which is used to fill the exhaust hole. The filling rod is divided into two parts, a thick part and a thin part. The diameter of the thin part is the same as that of the limiting ring, and the length is the same as the distance from the limiting ring to the inner surface of the lower mold; the diameter of the thick part is the same as that of the exhaust hole, and the length is greater than the distance from the limiting ring to the outer surface of the lower mold.

5. A differential pressure casting steering knuckle mold according to claim 4, characterized in that: It also includes a push rod, the diameter of which is smaller than the diameter of the limiting ring.

6. The differential pressure casting steering knuckle mold according to claim 3, characterized in that: The draft angle of the inner side wall of the side wall is 3 degrees.

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