Hub mold with split type upper mold

Abstract

The utility model belongs to the technical field of hub dies, and particularly relates to a hub die with a split type upper die. A hub mold with a split type upper mold comprises the upper mold, a side mold and a bottom mold, the upper mold comprises an upper mold connecting ring and an upper mold body, the upper mold connecting ring is located at the upper end of the upper mold, the upper mold connecting ring and the upper mold body are detachably fixed, and the upper mold connecting ring is provided with a cooling mechanism; a rim forming part is defined between the upper die body and the side die, the lower end face of the upper die connecting ring sequentially comprises a first face and a second face which have a height difference from the radial outer side to the radial inner side, and the upper end face of the upper die body sequentially comprises a third face and a fourth face which have a height difference from the radial outer side to the radial inner side. When the upper die connecting ring is fixed to the upper die body, the first face makes contact with the third face, and the second face does not make contact with the fourth face. The utility model has the advantages that the heat transfer efficiency of the upper end of the upper die can be further reduced, the cooling sequence gradient is optimized, and rim shrinkage cavities are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheel hub moulds, in particular to a wheel hub mould with a split upper mould. Background Art

[0002] At present, the wheel hub mold includes an upper mold, a bottom mold and a side mold that cooperate with each other. The upper mold is an integrated structure, and the rim is located at the upper end of the side mold and the upper mold. Its defects are: the wall thickness of the rim is greater than the wall thickness of the rim, and the aluminum liquid in the rim is a hot node when there is no cooling layout; after the cooling layout, the cooling will affect the rim temperature at the lower end of the rim, so that more shrinkage holes are generated in the rim, resulting in poor mechanical properties of the rim of the hub, which is prone to deformation and cracking.

[0003] A Chinese patent with application number 202020651242.8 discloses a casting upper die for a wheel hub and a casting mold for a wheel hub, including an upper die section, the upper die section facing the rear hanging portion of the wheel hub casting, a cooling assembly, which is arranged on the upper die section; and an upper die lower section, which is arranged below the upper die section and facing the rim portion of the wheel hub casting, the upper die lower section is separately arranged and in contact with the upper die section. When the above scheme is used for casting a wheel hub with a thicker rim and a thinner rim, although the heat transfer efficiency can be reduced by using a split upper die, it may still cause the rim forming part to be cooled by the upper die, so that the aluminum liquid in the rim forming part cools faster than the rim part, resulting in a chaotic cooling temperature sequence gradient, so that the rim still has the problem of shrinkage holes. Utility Model Content

[0004] The utility model aims to provide a wheel hub mould with a split upper mould which can further reduce the heat transfer efficiency of the upper end of the upper mould, optimize the cooling sequence gradient and reduce the shrinkage hole of the wheel rim.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a wheel hub mold with a split upper mold, comprising an upper mold, a side mold and a bottom mold, the upper mold comprising, from top to bottom, an upper mold connecting ring and an upper mold body which are independent of each other, the upper mold connecting ring is located at the upper end of the upper mold and is enclosed with the side mold to form a rim forming part, the upper mold connecting ring and the upper mold body are detachably fixed, and the upper mold connecting ring is provided with a cooling mechanism; the upper mold body and the side mold are enclosed to form a rim forming part, the lower end face of the upper mold connecting ring comprises, from the radial outer side to the radial inner side, a first face and a second face with a height difference, and the upper end face of the upper mold body comprises, from the radial outer side to the radial inner side, a third face and a fourth face with a height difference; when the upper mold connecting ring is fixed to the upper mold body, the first face is in contact with the third face, and the second face is not in contact with the fourth face.

[0006] Among them, this scheme divides the upper mold from top to bottom into an upper mold connecting ring and an upper mold body that are independent of each other. When the cooling mechanism of the upper mold connecting ring reduces the temperature of the upper mold connecting ring, the non-contact between the second surface and the fourth surface can further reduce the efficiency of temperature transfer and optimize the cooling sequence gradient, thereby avoiding the poor flow of aluminum liquid to the rim forming part due to the rapid cooling of the aluminum liquid in the rim forming part, which in turn causes the rim forming part to produce shrinkage holes and other casting quality problems due to insufficient shrinkage compensation. At the same time, the first surface and the third surface are both located radially outside the upper mold connecting ring and the upper mold body. The radial outside of the upper mold connecting ring and the upper mold body and the side mold are the rim forming part, so they need to fit tightly, thereby avoiding the generation of flash and aluminum leakage during the die-casting process.

[0007] The first surface, the second surface, the third surface and the fourth surface are all annular planes. There is a height difference between the first surface and the second surface, and there is also a height difference between the third surface and the fourth surface, thereby forming a step structure.

[0008] Preferably, a first step is provided at the lower end of the upper mold connecting ring, the first surface and the second surface are respectively two treads of the first step, and a second step is provided at the upper end of the upper mold body, the third surface and the fourth surface are respectively two treads of the second step; when the upper mold connecting ring is fixed to the upper mold body, the riser surface of the first step and the riser surface of the second step are in contact with each other.

[0009] The kick surface of the first step and the kick surface of the second step are in contact with each other, thereby limiting the radial position between the upper die connecting ring and the upper die body. When the upper die connecting ring and the upper die body are fixed, the first surface and the third surface are in contact with each other, and the kick surface of the first step and the kick surface of the second step are in contact with each other, so that the upper die connecting ring will not tilt.

[0010] Preferably, the lower end of the upper mold connecting ring is provided with a first protrusion extending downward to form the first step, and the upper end of the upper mold body is provided with a second protrusion extending upward to form the second step, and the first protrusion is located radially outside the second protrusion.

[0011] The first protrusion extends downward and is located radially outside the second protrusion, which can facilitate the operator to find the assembly position better when assembling the upper die ring and the upper die body. The upper end surface of the first protrusion is the first surface, and the upper end surface of the second protrusion is the fourth surface.

[0012] Preferably, the cooling mechanism is located at the radial outer end of the upper mold connecting ring, and when the upper mold connecting ring is fixed to the upper mold body, the cooling mechanism is located above the rim forming portion.

[0013] The cooling mechanism is located at the radial outer end of the upper die ring and above the rim forming part. This ensures that while accelerating the cooling of the rim, the cooling mechanism is further kept away from the upper die body, slowing down the cooling of the rim, and avoiding the poor flow of the aluminum liquid for shrinkage feeding in the rim forming part due to the rapid cooling of the aluminum liquid in the rim forming part, thereby causing the rim forming part to have shrinkage holes and other casting quality problems due to insufficient shrinkage feeding. The cooling mechanism can adopt any existing water cooling or air cooling device used in the hub mold.

[0014] Preferably, a plurality of inner protrusions extending radially inward are provided on the inner wall of the upper end of the upper mold body, an internal threaded hole opening upward is provided at the connection between the inner protrusion and the upper mold body, and a through hole penetrating upward is provided at the radial inner end of the upper mold connecting ring, and a fastening bolt passes through the through hole and is threadedly engaged with the internal threaded hole.

[0015] The upper die ring and the upper die body are fixed by tightening bolts. Since the upper end wall thickness of the upper die body is relatively thin, no threaded hole can be reserved. Therefore, an inner convex body is provided at the upper end of the upper die body to meet the assembly requirements while minimizing the influence of the increase in the local wall thickness of the die on the temperature gradient of the rim as much as possible.

[0016] Preferably, the upper mold connecting ring and the upper mold body are provided with at least two pin holes, the pin holes are matched with positioning pins, and the pin holes are arranged at the radial inner end of the upper mold connecting ring and at the connection between the upper mold body and the inner convex body.

[0017] The upper die connecting ring and the upper die body can be positioned by the positioning pin. At the same time, the pin hole is arranged on the radial inner end of the upper die connecting ring and the inner convex body to reduce the influence on the sequential gradient of the rim temperature.

[0018] Preferably, the inner protrusions are arranged at intervals in a ring shape.

[0019] The inner protrusions are arranged in an annular manner at intervals, so that when the upper die body and the upper die connecting ring are fixed, the fastening effect is better.

[0020] Preferably, the upper end surface of the inner convex body is flush with the fourth surface of the upper end of the upper mold body.

[0021] The structure is more compact and convenient to process.

[0022] The utility model has the following advantages: the scheme divides the upper die from top to bottom into an upper die connecting ring and an upper die body which are independent of each other. When the cooling mechanism of the upper die connecting ring reduces the temperature of the upper die connecting ring, the non-contact between the second surface and the fourth surface can further reduce the efficiency of temperature transfer, optimize the cooling sequence gradient, and thus avoid the poor flow of aluminum liquid for shrinkage compensation of the rim forming part due to the rapid cooling of the aluminum liquid of the rim forming part, which in turn causes the rim forming part to produce shrinkage holes and other casting quality problems due to insufficient shrinkage compensation. At the same time, the first surface and the third surface are both located radially outside the upper die connecting ring and the upper die body. The radial outside of the upper die connecting ring and the upper die body and the side die are the rim forming part, so they need to fit tightly, thereby avoiding the generation of flash and aluminum leakage during the die casting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view of the mold of Example 1 of the utility model.

[0024] Figure 2 This is a cross-sectional view of the upper mold body of Example 1.

[0025] Figure 3 This is a cross-sectional view of the upper mold body and the upper mold connecting ring of Example 1 after being fixed.

[0026] Figure 4 for Figure 3 Schematic diagram of the area that needs to be enlarged.

[0027] Figure 5 This is a cross-sectional view of the upper mold connecting ring of Example 1.

[0028] Figure 6 This is a top view of the upper mold connecting ring of Example 1.

[0029] Figure 7 This is a top view of the upper mold body of Example 1.

[0030] Figure 8 This is an enlarged view of the connection between the upper mold body and the upper mold connecting ring of Example 2.

[0031] Figure numbers: upper mold body 1, third surface 11, fourth surface 12, kick surface of second step 13, second protrusion 14, upper mold connecting ring 2, first surface 21, second surface 22, kick surface of first step 23, first protrusion 24, side mold 3, lower mold 4, cooling mechanism 5, inner protrusion 6, internal threaded hole 61, through hole 62, fastening bolt 7, pin hole 8, wheel rim 100, wheel rim 200. DETAILED DESCRIPTION

[0032] The utility model is further described below based on the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] like Figure 1 As shown, this embodiment 1 discloses a wheel hub mold with a split upper mold, including an upper mold, a side mold 3, and a bottom mold 4. The upper mold includes, from top to bottom, an upper mold connecting ring 2 and an upper mold body 1 that are independent of each other. The upper mold connecting ring 2 is located at the upper end of the upper mold. The upper mold connecting ring 2 and the side mold 3 enclose a rim forming portion for forming a wheel rim 100, and the upper mold body 1 and the side mold 3 enclose a rim forming portion for forming a wheel rim 200.

[0035] like Figures 2 to 5 As shown, the lower end surface of the upper die ring 2 includes a first surface 21 and a second surface 22 with a height difference from the radial outer side to the radial inner side, and the height of the first surface 21 is lower than the height of the second surface 22. The upper end surface of the upper die body 1 includes a third surface 11 and a fourth surface 12 with a height difference from the radial outer side to the radial inner side, and the height of the third surface 11 is lower than the height of the fourth surface 12. When the upper die ring 2 is fixed to the upper die body 1, the first surface 21 is in contact with the third surface 11, and the second surface 22 is not in contact with the fourth surface 12 and there is a gap of 0.5 mm.

[0036] The lower end of the upper die ring 2 is provided with a first protrusion 24 extending downward to form a first step, the first surface 21 and the second surface 22 are respectively two treads of the first step, the upper end of the upper die body 1 is provided with a second protrusion 14 extending upward to form a second step, the third surface 11 and the fourth surface 12 are respectively two treads of the second step, the first protrusion 24 is located radially outside the second protrusion 14, when the upper die ring 2 is fixed to the upper die body 1, the kick surface 23 of the first step and the kick surface 13 of the second step contact each other. Among them, the lower end surface of the first protrusion 24 is the first surface 21, and the upper end surface of the second protrusion 14 is the fourth surface 12.

[0037] like Figures 2 to 7 As shown, the inner wall of the upper end of the upper die body 1 is provided with a plurality of inner protrusions 6 arranged at annular intervals and extending radially inward, and the connection between the inner protrusion 6 and the upper die body 1 is provided with an internal threaded hole 61 opening upward, and the radial inner end of the upper die connecting ring 2 is provided with a through hole 62 penetrating from top to bottom, and the fastening bolt 7 passes through the through hole 62 and is threadedly matched with the internal threaded hole 61, and the bolt head of the fastening bolt 7 is located in the through hole 62, thereby achieving the fixation of the upper die body 1 and the upper die connecting ring 2. The upper die connecting ring 2 and the upper die body 1 are provided with two pin holes 8, and the pin holes 8 are matched with positioning pins (not shown in the figure), and the pin holes 8 are arranged at the radial inner end of the upper die connecting ring 2 and the connection between the upper die body 1 and the inner protrusion 6. Among them, the upper end surface of the inner protrusion 6 is flush with the fourth surface 12.

[0038] like Figure 1 As shown, the cooling mechanism 5 is located at the blind hole at the radial outer end of the upper die ring 2. When the upper die ring 2 is fixed to the upper die body 1, the cooling mechanism 5 is located above the rim forming portion. The cooling mechanism in this embodiment is an existing air cooling mechanism.

[0039] During the actual casting process of the wheel hub, the cooling mechanism cools the rim forming part, and the second surface 22 and the fourth surface 12 do not contact and there is a gap of 0.5 mm, thereby blocking the temperature transfer, thereby avoiding the poor flow of aluminum liquid to the rim forming part due to the rapid cooling of the aluminum liquid in the rim forming part, which in turn causes casting quality problems such as shrinkage holes in the rim forming part due to insufficient shrinkage compensation.

[0040] Example 2

[0041] The difference between the second embodiment and the first embodiment is that the first protrusion 24 of the upper die ring 2 is located radially inside the second protrusion 14 of the upper die body 1. The lower end surface of the first protrusion 24 is the second surface 22, and the upper end surface of the second protrusion 14 is the third surface 12.

Claims

1. A wheel hub mold with a split upper mold, comprising an upper mold, a side mold and a bottom mold, wherein the upper mold comprises, from top to bottom, an upper mold connecting ring and an upper mold body which are independent of each other, wherein the upper mold connecting ring is located at the upper end of the upper mold and is enclosed with the side mold to form a wheel rim forming portion, wherein the upper mold connecting ring is detachably fixed to the upper mold body, and the upper mold connecting ring is provided with a cooling mechanism; characterized in that: The upper mold body and the side mold enclose a rim forming portion, the lower end face of the upper mold connecting ring includes a first face and a second face with a height difference from the radial outer side to the radial inner side, and the upper end face of the upper mold body includes a third face and a fourth face with a height difference from the radial outer side to the radial inner side; when the upper mold connecting ring is fixed to the upper mold body, the first face is in contact with the third face, and the second face is not in contact with the fourth face.

2. The wheel hub mold with a split upper mold according to claim 1, characterized in that: A first step is provided at the lower end of the upper mold connecting ring, and the first surface and the second surface are respectively two treads of the first step; a second step is provided at the upper end of the upper mold body, and the third surface and the fourth surface are respectively two treads of the second step; when the upper mold connecting ring is fixed to the upper mold body, the riser surface of the first step and the riser surface of the second step are in contact with each other.

3. The wheel hub mold with a split upper mold according to claim 2, characterized in that: The lower end of the upper mold connecting ring is provided with a first protrusion extending downward to form the first step, and the upper end of the upper mold body is provided with a second protrusion extending upward to form the second step, and the first protrusion is located radially outside the second protrusion.

4. The wheel hub mold with a split upper mold according to claim 1, characterized in that: The cooling mechanism is located at the radial outer end of the upper die connecting ring. When the upper die connecting ring is fixed to the upper die body, the cooling mechanism is located above the wheel rim forming portion.

5. The wheel hub mold with a split upper mold according to claim 1, 2, 3 or 4, characterized in that: The inner wall of the upper end of the upper mold body is provided with a plurality of inner protrusions extending radially inward, and the connection between the inner protrusions and the upper mold body is provided with an internal threaded hole opening upward, and the radial inner end of the upper mold connecting ring is provided with a through hole penetrating up and down, and the fastening bolt passes through the through hole and is threadedly engaged with the internal threaded hole.

6. The wheel hub mold with a split upper mold according to claim 5, characterized in that: The upper mold connecting ring and the upper mold body are provided with at least two pin holes, and the pin holes are matched with positioning pins. The pin holes are arranged at the radial inner end of the upper mold connecting ring and at the connection between the upper mold body and the inner convex body.

7. The wheel hub mold with a split upper mold according to claim 5, characterized in that: The inner convex bodies are arranged at intervals in a ring shape.

8. The wheel hub mold with a split upper mold according to claim 5, characterized in that: The upper end surface of the inner convex body is flush with the fourth surface of the upper end of the upper mold body.

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