Top die exhaust structure of hub casting die

Abstract

The utility model relates to the technical field of aluminum alloy hub casting, and discloses a hub casting die top die exhaust structure which comprises an exhaust plug arranged corresponding to a via hole in the rim of a top die, the exhaust plug comprises an exhaust column, the exhaust column is provided with an exhaust gap used for exhausting gas in a cavity, the exhaust gap penetrates through the exhaust column in the axial direction, and the exhaust gap is communicated with the exhaust column. The top end of the exhaust column is connected with a fixing base, and an exhaust hole communicating with the exhaust seam is formed in the fixing base. The venting plug can be fixedly connected to the top die rim via hole through the fixing base, the problem that in a traditional venting structure, the venting plug is prone to falling off and losing is solved, and the risk of aluminum leakage is eradicated; meanwhile, the fixing seat has a positioning effect on the venting plug, so that the mounting precision of the venting plug is ensured, and the problems that in an existing venting structure, the fit clearance between the venting plug and the via hole is not controlled, and unsmooth venting and aluminum leakage are likely to occur are solved; and the exhaust seam axially penetrating through the exhaust column is used as an exhaust channel, so that the exhaust area is increased, and the exhaust efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of aluminum alloy wheel hub casting technology, and in particular to a top mold venting structure for wheel hub casting molds. Background Technology

[0002] In the low-pressure casting process of aluminum alloy wheels, the wheel mold is usually equipped with a venting structure for venting the mold cavity, in order to avoid defects such as porosity, incomplete filling, oxide inclusions, and flash in the blank caused by poor venting. Existing top mold rim venting structures include vent plugs inserted into the top mold through-hole. After the vent plug is installed in the top mold through-hole, it needs to be connected and fixed to the top mold via the upper mold plate to press and fix the vent plug within the through-hole. During venting, the gas in the cavity is discharged from the mold through the fitting gap between the vent plug and the through-hole.

[0003] In actual production, the top mold and upper mold plate need to be repeatedly disassembled. When the upper mold plate detaches from the top mold, the vent plug loses its clamping and fixing function and is prone to falling out of the top mold through hole, easily causing the vent plug to be lost. If this is not detected in time, the molten aluminum in the mold cavity will overflow through the through hole after the top mold without the vent plug is put into production, causing aluminum leakage. At the same time, the vent plug fixing method by the top mold plate cannot guarantee the positioning accuracy of the vent plug, causing the fit clearance between the vent plug and the through hole to be uncontrolled, which can easily lead to problems such as poor venting and aluminum leakage.

[0004] Therefore, developing a new type of top mold venting structure for wheel hub casting molds is an urgent problem to be solved. Utility Model Content

[0005] The purpose of this utility model is to address the above-mentioned problems by providing a top mold venting structure for wheel hub casting molds. This solves the problem that existing venting structures for wheel hub casting molds are prone to venting plugs falling off or being lost during use, leading to aluminum leakage accidents. At the same time, it also solves the problem that existing venting structures cannot guarantee the positioning accuracy of the venting plug, resulting in uncontrolled clearance between the venting plug and the through hole, which easily leads to poor venting and aluminum leakage.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A venting structure for the top mold of a wheel hub casting mold includes a vent plug disposed on a through hole corresponding to the rim of the top mold. The vent plug includes a vent column, and the vent column has a venting slit for venting gas from the mold cavity. The venting slit extends axially through the vent column. The top of the vent column is connected to a fixing seat for fixing the vent plug. The fixing seat has a venting hole, the lower end of which is connected to the venting slit, and the upper end of the venting slit is connected to the outside atmosphere.

[0008] Preferably, the diameter of the fixing seat is larger than the diameter of the through hole, so that the fixing seat can be interference-fitted into the through hole.

[0009] Preferably, the outer diameter of the fixing seat is provided with an external thread, and the through hole is provided with an internal thread corresponding to the external thread, so that the fixing seat and the internal thread in the through hole are threadedly engaged.

[0010] Preferably, the top of the fixed base is provided with a slot for rotating the exhaust plug.

[0011] Preferably, the width of the venting slit is 0.15-0.3 mm.

[0012] Preferably, the exhaust column has multiple exhaust slits, which are distributed radially in a quincunx pattern on the exhaust column.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention provides a fixing seat on the vent plug to securely connect it to the through hole on the top mold rim. This avoids the problem of the vent plug falling off or being lost, which is common in traditional venting structures where the vent plug needs to be pressed down by the top plate. This eliminates the risk of aluminum leakage and ensures production safety. Simultaneously, the fixing seat positions the vent plug, ensuring installation accuracy and solving the problem of uncontrolled clearance between the vent plug and the through hole in existing venting structures, which can lead to poor venting and aluminum leakage. Furthermore, this invention uses the venting slot axially penetrating the venting column as the venting channel, eliminating the need for venting through the clearance between the vent plug and the through hole, increasing the venting area and improving venting efficiency. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model.

[0018] Figure 3 This is a bottom view of the exhaust column structure in this utility model.

[0019] Figure 4 This is a schematic diagram of the structure of this utility model before assembly.

[0020] Figure 5 This is a schematic diagram of the assembled structure of this utility model.

[0021] In the diagram: 10--Top mold rim; 11--Through hole; 12--Internal thread; 20--Vent plug; 21--Vent column; 22--Vent slit; 23--Fixed seat; 24--Vent hole; 25--External thread; 26--Slotted groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] like Figure 1-5 As shown, a top mold venting structure for a wheel hub casting mold includes a vent plug 20 corresponding to the diameter of a through hole 11 on the top mold rim 10. The vent plug 20 includes a vent column 21 with a vent slit 22 for venting gas from the mold cavity. The vent slit 22 extends axially through the vent column 21. A fixing seat 23 for fixing the vent plug 20 is connected to the top of the vent column 21. A vent hole 24 is provided in the fixing seat 23, with its lower end connected to the vent slit 22 and its upper end connected to the outside atmosphere. In use, the vent plug 20 is inserted into the through hole 11 of the top mold rim 10 and fixed to the through hole 11 via the fixing seat 23. During the casting process, the gas in the mold cavity is discharged sequentially through the vent slit 22 on the vent column 21 and the vent hole 24 in the fixing seat 23.

[0024] This invention provides a fixing seat 23 on the exhaust plug 20 to fix the exhaust plug 20, allowing the exhaust plug 20 to be fixedly connected to the through hole 11 of the top mold rim 10. This avoids the problem of the exhaust plug 20 falling off or being lost, which is common in traditional exhaust structures where the exhaust plug 20 needs to be pressed by the top plate. This eliminates the risk of aluminum leakage and ensures production safety. At the same time, the fixing seat 23 positions the exhaust plug 20, ensuring the installation accuracy of the exhaust plug 20. This solves the problem of uncontrolled clearance between the exhaust plug 20 and the through hole 11 in existing exhaust structures, which can easily lead to poor exhaust and aluminum leakage. Furthermore, this invention uses the exhaust slit 22 that axially penetrates the exhaust column 21 as an exhaust channel, eliminating the need for exhaust through the clearance between the exhaust plug 20 and the through hole 11 in traditional exhaust structures. This increases the exhaust area and improves exhaust efficiency.

[0025] The first implementation method, such as Figure 1 As shown, the fixing seat 23 is connected and fixed to the through hole 11 by interference fit. The diameter of the fixing seat 23 is slightly larger than the diameter of the through hole 11, so that the exhaust plug 20 can be firmly fixed in the through hole 11 through the fixing seat 23, thereby improving the installation accuracy and connection strength of the exhaust plug 20.

[0026] The second implementation method, such as Figure 2 As shown, the fixing seat 23 is fixedly connected to the through hole 11 by a threaded connection. Specifically, the fixing seat 23 has an external thread 25 on its outer diameter, and the through hole 11 has an internal thread 12 corresponding to the external thread 25. The fixing seat 23 and the internal thread 12 in the through hole 11 are threadedly engaged to realize the fixed connection between the exhaust plug 20 and the through hole 11.

[0027] To facilitate the disassembly and maintenance of the exhaust plug 20, the top of the fixing base 23 is provided with a slot 26 for rotating the exhaust plug 20. When disassembling or assembling the exhaust plug 20, the operator can quickly disassemble or assemble the exhaust plug 20 by inserting a flathead wrench into the slot 26 and rotating it.

[0028] Preferably, the width of the venting slit 22 is 0.15-0.3mm, which ensures smooth venting while effectively preventing aluminum leakage and ensuring production safety.

[0029] Preferably, such as Figure 3 As shown, the exhaust column 21 has multiple exhaust slits 22, which are distributed radially in a quincunx pattern on the exhaust column 21, further increasing the area of ​​the exhaust channel and improving exhaust efficiency.

[0030] The above-disclosed embodiments are merely specific examples of this utility model, but this utility model is not limited thereto. For those skilled in the art, any modifications made without departing from the principle of this utility model should be considered as protected by this utility model.

Claims

1. A wheel hub casting mold drag vent structure, characterized by: The exhaust plug (20) is arranged on the through hole (11) on the corresponding top die rim (10), and the exhaust plug (20) comprises an exhaust column (21), the exhaust column (21) is provided with an exhaust slot (22) for exhausting cavity gas, the exhaust slot (22) penetrates the exhaust column (21) in the axial direction, the top end of the exhaust column (21) is connected with a fixing seat (23) for fixing the exhaust plug (20), the fixing seat (23) is provided with an exhaust hole (24) therein, the lower end of the exhaust hole (24) is communicated with the exhaust slot (22), and the upper end of the exhaust slot (22) is communicated with the atmosphere.

2. A wheel hub casting mold drag vent structure as defined in claim 1, wherein: The diameter of the fixing seat (23) is greater than the hole diameter of the through hole (11), so that the fixing seat (23) can be interference-fitted in the through hole (11).

3. A wheel hub casting mold drag vent structure as defined in claim 1, wherein: An external thread (25) is arranged on the outer diameter of the fixing seat (23), an internal thread (12) corresponding to the external thread (25) is arranged in the through hole (11), and the fixing seat (23) is threadedly connected with the internal thread (12) in the through hole (11).

4. A wheel hub casting mold drag vent structure as defined in claim 3, wherein: A slot (26) is arranged at the top end of the fixing seat (23) for rotating the exhaust plug (20).

5. A wheel hub casting mold drag vent structure as defined in claim 1, wherein: The width of the exhaust slot (22) is 0.15-0.3 mm.

6. A wheel hub casting mold drag vent structure as defined in claim 1, wherein: A plurality of exhaust slots (22) are arranged on the exhaust column (21) in a radial direction in a plum blossom shape.

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