Shell air hole eliminating device

Abstract

The utility model discloses a shell air hole eliminating device, which belongs to the technical field of high-temperature die casting and comprises a die casting body, the die casting body is provided with an accommodating cavity for forming a workpiece by pouring, the die casting body is provided with a first pouring gate communicated with the accommodating cavity, and the accommodating cavity is further communicated with a second pouring gate. The second pouring gate and the first pouring gate are arranged at different positions of the containing cavity. According to the device, under the condition that the product structure is not changed, the production defects existing in product design are overcome by adjusting the pouring gate and performing fixed-point extrusion, and the technical problem that too many air holes exist in a speed reducer shell is mainly solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to high temperature die casting technical field, concretely relates to a shell air hole elimination device. BACKGROUND

[0002] High temperature die casting technology is a manufacturing process used to produce high-performance metal parts, particularly in the automotive, aerospace and military fields. This technology can produce complex shape, accurate size, high surface finish of castings, which usually have good mechanical properties and corrosion performance. High temperature die casting usually involves injecting molten metal into a rapidly cooled mold under high pressure. At present, aluminum alloy shell is widely used in modern tools such as automobile and motorcycle. Due to the production characteristics of high pressure die casting, air holes are likely to occur in thick parts, so the elimination of air holes in the shell is very important in production.

[0003] Application No. CN201310457231.0 discloses a die casting device for solving air hole defects of die casting products and a die casting process thereof. The invention is carried out according to the following steps: 1. When the molten alloy liquid is poured into the barrel, the injection rod punch starts to move forward, and the low-speed segmented movement of 0.15-0.3 m / s is adopted, and the metal liquid is in laminar flow state; 2. When the molten alloy liquid is moved to the mold gate, the punch enters the switching position of low speed and high speed, and within 0.03-0.05 s, the punch running speed is instantaneously increased to 3-6 m / s; 3. When the high-speed filling is completed, the running speed of the punch enters the high-speed deceleration state, and the supercharging process is adopted; wherein the vacuum extraction is completed in stage 1, and is carried out between 30-60 mm before the punch closes the feeding port to the gate. The invention provides a die casting device for solving air hole defects of die casting products and a die casting process thereof, which can perform good vacuum extraction and ensure long-term smooth operation of the device. The patent technology still has room for improvement.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of clearly and completely describing the technical scheme of the present application, and for the convenience of understanding by those skilled in the art. The above technical scheme cannot be considered as known to those skilled in the art only because it is described in the background section of the present application. CONTENT OF THE UTILITY MODEL

[0005] In view of the problems existing in the prior art, the utility model provides a shell air hole elimination device, which solves the technical problem of too many air holes in the reducer shell by adjusting the runner and the fixed-point extrusion without changing the product structure.

[0006] To solve the above technical problems, the utility model specifically provides the following technical scheme:

[0007] A shell gas hole elimination device, comprising a die casting body, the die casting body has a containing cavity for pouring forming a workpiece, the die casting body has a first runner communicating with the containing cavity, and the containing cavity is also communicated with a second runner, and the second runner is arranged at a different position of the containing cavity from the first runner.

[0008] According to an embodiment of the present application, the first runner has at least two die casting runners capable of communicating with the containing cavity of the die casting body, for pouring molten metal, and the containing cavity of the die casting body is provided with a die casting ladle capable of communicating therewith, and the die casting ladle can effectively remove bubbles in the molten metal, thereby improving the purity and quality of the molten metal.

[0009] According to an embodiment of the present application, the extrusion hole includes a first extrusion hole, a second extrusion hole and a third extrusion hole arranged on the die casting body, the first extrusion hole, the second extrusion hole and the third extrusion hole have a spacing distance, the second extrusion hole is located in the middle of the first extrusion hole and the third extrusion hole, and the first extrusion hole, the second extrusion hole and the third extrusion hole are located on the same side of the die casting body.

[0010] At present, most of the housings of automobile and motorcycle reducers and transmissions and the like are made of aluminum alloy. Due to the production characteristics of high-pressure die casting, there is a high probability that pores will be generated in thick parts of the product, which needs to be optimized and adjusted in subsequent production. By arranging the second runner on the side close to the first extrusion hole, the second extrusion hole and the third extrusion hole, the channel of the molten metal liquid into the die casting mold is increased, which can greatly improve the occurrence of pores and increase the product qualification rate.

[0011] According to an embodiment of the present application, the containing cavity of the die casting body has an extrusion hole capable of communicating with the outside, and the extrusion hole is provided with an extrusion device. The extrusion device includes a pin sleeve matched with the extrusion hole, the middle part of the pin sleeve has an extrusion pin capable of displacing relative to the pin sleeve, the extrusion pin can enter and exit the extrusion hole, a push rod protection sleeve is arranged on the pin sleeve, the push rod protection sleeve is a column sleeve structure with a through hole in the center, the two ends of the push rod protection sleeve are respectively provided with a sleeve plate and a protection sleeve fixed plate fixed by bolts, the middle part of the sleeve plate is provided with a through hole corresponding to the pin sleeve and is fixedly connected with the pin sleeve, the middle part of the protection sleeve fixed plate is provided with a push rod capable of displacing relative to the protection sleeve, the end of the push rod located in the push rod protection sleeve is connected with a hydraulic oil cylinder, and the end of the push rod located in the push rod protection sleeve is connected with the extrusion pin by a pin connection.

[0012] When the second runner is increased and pores are still generated, the extrusion device is further increased on this basis, and the extrusion device is installed above the first extrusion hole, the second extrusion hole or the third extrusion hole where pores are still generated. When the extrusion device works, the oil in the hydraulic oil cylinder will push the push rod, the push rod will push the extrusion pin, the extrusion pin will be pushed to extrude the aluminum liquid at the time point when the aluminum liquid enters the solidification stage, the gas in the aluminum liquid will be discharged, so that the aluminum liquid is dense and pores are avoided.

[0013] When the first extrusion hole, the second extrusion hole and the third extrusion hole all produce pores, then the extrusion device can be arranged above the first extrusion hole, the second extrusion hole and the third extrusion hole, and the device can solve the problem of pores in die-cast aluminum at low cost. It should be noted that the runner can regionalize the optimization of the pore problem, and the extrusion device is used to solve the local pore problem, so the extrusion device is not limited to be used on the first extrusion hole, the second extrusion hole and the third extrusion hole, and the extrusion device can be used on the part with the pore problem. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings.

[0015] Figure 1 It is a pouring scheme schematic diagram of the reducer shell of the present application.

[0016] Figure 2 It is a partial schematic diagram of the newly added second runner of the present application.

[0017] Figure 3 It is a schematic diagram of the second runner optimization scheme of the shell of the present application.

[0018] Figure 4 It is a schematic diagram of the extrusion device scheme of the present application.

[0019] The drawings show that: 10 is a die casting body; 101 is a first runner; 102 is a die casting ladle; 103 is a second runner; 110 is a first extrusion hole; 111 is a second extrusion hole; 112 is a third extrusion hole; 201 is an extrusion pin; 202 is a pin sleeve; 203 is a sleeve plate; 204 is a push rod protection sleeve; 205 is a protection sleeve fixing plate; 206 is a push rod; 207 is a hydraulic oil cylinder. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] The concepts involved in the present application will be described below in conjunction with the accompanying drawings. It should be noted that the following description of the various concepts is only intended to make the content of the present application easier to understand, and does not represent a limitation on the scope of protection of the present application; meanwhile, the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0022] Embodiment 1:

[0023] Referring to the accompanying drawings, Figures 1-4 As shown in the accompanying drawings, a shell pore elimination device includes a die casting body 10 having a containing cavity for pouring a workpiece, the die casting body 10 has a first runner 101 communicating with the containing cavity, and the containing cavity is further communicated with a second runner 103, and the second runner 103 is arranged at a different position from the first runner 101 in the containing cavity.

[0024] The first runner 101 has at least two die casting runners capable of communicating with the containing cavity of the die casting body 10 for pouring molten metal, and the die casting body 10 is provided with a die casting ladle 102 capable of communicating with the containing cavity, which can effectively remove bubbles in the molten metal and improve the purity and quality of the molten metal.

[0025] The extrusion holes include a first extrusion hole 110, a second extrusion hole 111 and a third extrusion hole 112 arranged on the die casting body 10, the first extrusion hole 110, the second extrusion hole 111 and the third extrusion hole 112 have a spacing distance, the second extrusion hole 111 is located in the middle of the first extrusion hole 110 and the third extrusion hole 112, and the first extrusion hole 110, the second extrusion hole 111 and the third extrusion hole 112 are located on the same side of the die casting body 10.

[0026] At present, most of the housings of automobile and motorcycle reducers and transmissions and the like are made of aluminum alloy. Due to the production characteristics of high-pressure die casting, there is a high probability that pores will be generated in thick parts of the product, which needs to be optimized and adjusted in subsequent production. By arranging the second runner 103 on the side close to the first extrusion hole 110, the second extrusion hole 111 and the third extrusion hole 112, the channel of the molten metal liquid into the die casting mold is increased, which can greatly improve the occurrence of pores and increase the product qualification rate.

[0027] The containing cavity of the die casting body 10 has an extrusion hole capable of communicating with the outside, and the extrusion hole is provided with an extrusion device. The extrusion device comprises a pin sleeve 202 provided with the extrusion hole, the middle part of the pin sleeve 202 has an extrusion pin 201 capable of being displaced relative to the pin sleeve 202, the extrusion pin 201 can enter and exit the extrusion hole, the pin sleeve 202 is provided with a push rod protection sleeve 204, the push rod protection sleeve 204 is a column sleeve structure with a through hole in the center, the two ends of the push rod protection sleeve 204 are respectively provided with a sleeve plate 203 and a protection sleeve fixed plate 205 fixed by bolts, the middle part of the sleeve plate 203 is provided with a through hole corresponding to the pin sleeve 202 and is fixedly connected with the pin sleeve 202, the middle part of the protection sleeve fixed plate 205 is provided with a push rod 206 capable of being displaced relative to the protection sleeve fixed plate 205, the push rod 206 is connected with a hydraulic oil cylinder 207 at the end, and the end of the push rod 206 located in the push rod protection sleeve 204 is connected with the extrusion pin 201 in the form of a pin.

[0028] When the second runner 103 is increased and air holes are still generated, the extrusion device is further increased on the basis of the first extrusion hole 110, the second extrusion hole 111 or the third extrusion hole 112 where air holes are still generated. When the extrusion device works, the oil in the hydraulic oil cylinder 207 pushes the push rod 206, the push rod 206 pushes the extrusion pin 201, the extrusion pin 201 is pushed to extrude the aluminum liquid at the time point when the aluminum liquid enters the solidification stage, the gas in the aluminum liquid is discharged, and the aluminum liquid is densified to avoid the generation of air holes.

[0029] When the first extrusion hole 110, the second extrusion hole 111 and the third extrusion hole 112 all generate air holes, the extrusion device can be arranged above the first extrusion hole 110, the second extrusion hole 111 and the third extrusion hole 112. The device can solve the problem of air holes in die-cast aluminum at low cost. It should be noted that the runner can be regionalized to optimize the air hole problem, and the extrusion device is used to solve the local air hole problem. Therefore, the extrusion device is not limited to be used on the first extrusion hole 110, the second extrusion hole 111 and the third extrusion hole 112, and the extrusion device can be used on the parts with air hole problems.

[0030] The above-mentioned embodiments and / or implementations are only used to illustrate the preferred embodiments and / or implementations of the present application, and do not limit the embodiments of the present application in any form. Any person skilled in the art can make some changes or modifications without departing from the scope of the technical means disclosed in the present application, and other equivalent embodiments can be obtained, but they should be regarded as the same technology or embodiment as the present application.

[0031] The principles and implementation manners of the present application are described by using specific examples in the present text, and the above example descriptions are only used to help understand the method of the present application and its core idea. The above descriptions are only preferred implementation manners of the present application, and it should be noted that, due to the limited nature of the language expression, there are objectively infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, refinements or changes can be made without departing from the principles of the present application, and the above technical features can also be combined in an appropriate manner; the improvements, refinements, changes or combinations, or the direct application of the utility model concept and technical solution to other occasions without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A housing pinhole elimination apparatus comprising a die casting body (10) having a receiving cavity for casting a workpiece, the die casting body (10) having a first sprue (101) communicating with the receiving cavity, characterized in that: The accommodating cavity is also communicated with a second runner (103), which is arranged at a different position from the first runner (101) in the accommodating cavity. The first runner (101) has at least two pressure casting runners capable of communicating with the accommodating cavity of the pressure casting body (10).

2. A housing air vent elimination device according to claim 1, wherein The accommodating cavity of the pressure casting body (10) is provided with a pressure casting ladle (102) capable of communicating therewith.

3. A housing air vent elimination device according to claim 1, wherein The accommodating cavity of the pressure casting body (10) has an extrusion hole capable of communicating with the outside, and the extrusion hole is provided with an extrusion device.

4. A housing air vent elimination device according to claim 3, wherein The extrusion device comprises a pin sleeve (202) provided with the extrusion hole, and the pin sleeve (202) has an extrusion pin (201) capable of being displaced therefrom in the middle part, and the extrusion pin (201) can enter and exit the extrusion hole.

5. A housing air vent elimination device according to claim 4, wherein A push rod protection sleeve (204) is arranged on the pin sleeve (202), the push rod protection sleeve (204) is a column sleeve structure with a through hole in the center, and the push rod protection sleeve (204) is provided with a sleeve plate (203) and a protection sleeve fixing plate (205) at both ends and fixed by bolts, the sleeve plate (203) is provided with a through hole corresponding to the pin sleeve (202) in the middle part and is fixedly connected with the pin sleeve (202), the protection sleeve fixing plate (205) is provided with a push rod (206) capable of being displaced therefrom in the middle part, the push rod (206) is connected with a hydraulic oil cylinder (207) at the tail end, and one end of the push rod (206) located in the push rod protection sleeve (204) is connected with the extrusion pin (201) in the form of a pin.

6. A housing air vent elimination device according to claim 4, wherein The extrusion hole comprises a first extrusion hole (110), a second extrusion hole (111) and a third extrusion hole (112) arranged on the pressure casting body (10).

7. A housing vent elimination device according to claim 6, wherein The first extrusion hole (110), the second extrusion hole (111) and the third extrusion hole (112) have a spacing distance, and the second extrusion hole (111) is located in the middle part of the first extrusion hole (110) and the third extrusion hole (112).

8. A housing air vent elimination device according to claim 6, wherein The first extrusion hole (110), the second extrusion hole (111) and the third extrusion hole (112) are located on the same side of the pressure casting body (10).

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