Local extrusion device for automobile auxiliary frame mold

Abstract

The invention discloses a local extrusion device for an automobile auxiliary frame die, which comprises a slide block, an extrusion pin and an extrusion oil cylinder, an extrusion hole communicated with a cavity of the die is arranged in the slide block, the extrusion hole corresponds to a position of a product which is thicker in wall thickness and needs feeding, the extrusion pin is movably arranged in the extrusion hole, the extrusion pin is connected to the extrusion oil cylinder, and the extrusion oil cylinder is connected with the extrusion pin. The extrusion pin is driven by the extrusion oil cylinder to move in the extrusion hole, and the device is characterized in that an air exhaust mechanism used for exhausting air in the extrusion hole outwards is arranged between the sliding block and the extrusion pin. The mold has the advantages that the structure is simple, the air exhaust mechanism used for exhausting air in the extrusion hole outwards is arranged between the sliding block with the extrusion hole and the extrusion pin, and local continuous air exhaust can be achieved through the air exhaust mechanism, so that the air content of a local area in the mold is reduced, the compactness of the interior of a product is effectively enhanced, and the product quality is improved. And air holes in the die casting are eliminated or obviously reduced, so that the qualified rate of products is improved.

Description

Technical Field

[0001] The invention relates to the field of automobile parts manufacturing, in particular to a local extrusion device for an automobile subframe mold. Background Art

[0002] The subframe is an important part of the automobile chassis. For a car with a load-bearing body, the subframe and suspension are actually the chassis of the car. The subframe can block noise and vibration to improve the driving comfort of the car, and can also improve the rigidity of the car body and enhance the safety performance of the car. At present, in order to meet the lightweight design of the car, the subframe is basically an aluminum alloy subframe, which is made of aluminum alloy die-casting. In the actual aluminum alloy die-casting manufacturing process, the product has the problem of uneven wall thickness and local thicker wall thickness. The thinner wall area solidifies first, affecting the fluidity and pressure transmission of the alloy liquid. The thicker wall area cannot be compensated and shrinkage cavities are formed. The widely used process measure to effectively solve the shrinkage cavity defect is to force shrinkage compensation by local pressure, that is, a local extrusion device composed of an extrusion pin and an extrusion cylinder is set at the corresponding position. When the mold is filled, the local extrusion device is in a backward state. When the product is filled and about to solidify, the extrusion pin is pushed by the extrusion cylinder to press the excess local extruded aluminum alloy into the product, and the thicker wall position is focused on shrinkage compensation. This approach has the following problems: the areas with thicker walls are isolated features relative to the main body of the product, the fluidity of the molten aluminum in such features is poor, and the air content in this area is high, making it difficult for the air-entrained molten aluminum to be discharged, and there is a greater risk of pores, especially after post-heat treatment. Many exploded pores were found through X-ray irradiation, resulting in a low product qualification rate. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a local extrusion device for automobile subframe mold, by which the internal compactness of the product can be effectively enhanced, the pores in the die casting can be eliminated or significantly reduced, so as to improve the qualified rate of the finished product.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: A local extrusion device for a vehicle subframe mold comprises a slider, an extrusion pin and an extrusion cylinder. The slider is provided with an extrusion hole connected to the mold cavity of the mold. The extrusion hole corresponds to a position where the wall thickness of the product is thick and needs to be compensated for shrinkage. The extrusion pin is movably provided in the extrusion hole. The extrusion pin is connected to the extrusion cylinder and is driven by the extrusion cylinder to move in the extrusion hole. An exhaust mechanism for extracting air from the extrusion hole is provided between the slider and the extrusion pin.

[0005] The exhaust mechanism includes an exhaust pipe sleeve, which is fixedly arranged in the extrusion hole. The exhaust pipe sleeve has a through cavity for movably installing the extrusion pin. The extrusion pin is movably arranged in the through cavity and has a gap with the through cavity to form a first air passage. A second air passage is arranged between the exhaust pipe sleeve and the extrusion hole. The exhaust pipe sleeve is provided with an air hole for connecting the first air passage and the second air passage. The exhaust pipe sleeve is provided with an exhaust seat in a sealing connection at the rear end. The exhaust seat is provided with an exhaust channel connected to the first air passage, and an exhaust pipe is connected to the exhaust channel.

[0006] The slider comprises a slider body and a slider seat, the slider seat is fixedly arranged at the rear end of the slider, and the extrusion hole passes through the slider body and the slider seat; The exhaust pipe sleeve comprises a front pipe sleeve arranged in the slider body and a rear pipe sleeve arranged in the slider seat in sequence from front to back, and the exhaust seat is fixedly arranged in the slider seat; The front section pipe sleeve includes a positioning and mounting part, an introduction part and a main body which are arranged in sequence from front to back. The positioning and mounting part is tightly fitted and fixed in the extrusion hole. The positioning and mounting part has a flat end face with a chip cut. The second air passage is formed between the flat end face with a chip cut and the extrusion hole, the introduction part and the extrusion hole, and the main body and the extrusion hole. The air holes are respectively arranged on the introduction part and the main body, and a first sealing member is arranged between the rear end of the main body and the extrusion hole.

[0007] The introduction part is a truncated cone with a small front and a large rear. The outer diameter of the small end of the introduction part matches the outer diameter of the positioning and mounting part, and the outer diameter of the large end of the introduction part matches the outer diameter of the main body.

[0008] A second sealing member is provided at the joint between the front section pipe sleeve and the rear section pipe sleeve, and a sealed connection between the front section pipe sleeve and the rear section pipe sleeve is achieved through the second sealing member.

[0009] The vacuum seat has a mounting hole for the extrusion pin to pass through and install, the mounting hole is connected to the through cavity, a sealing member is provided at the joint between the mounting hole and the through cavity, and the sealing member is used to realize the sealed connection between the mounting hole and the through cavity.

[0010] A cylinder fixing plate is arranged at the rear end of the sliding block, and the cylinder body of the extrusion cylinder is fixedly arranged on the cylinder fixing plate.

[0011] The exhaust pipe is connected with corresponding exhaust equipment.

[0012] Compared with the prior art, the advantages of the present invention are: simple structure, and the shrinkage compensation problem of the product is effectively solved by arranging extrusion pins and extrusion holes at the positions where the wall thickness of the corresponding product is thick and shrinkage compensation is required. At the same time, an exhaust mechanism for extracting the air in the extrusion hole to the outside is arranged between the slider with the extrusion hole and the extrusion pin. The exhaust mechanism can achieve local continuous exhaust, thereby reducing the air content in the local area of ​​the mold, making it more in line with the "high vacuum" of high-pressure vacuum die-casting. For the problem of shrinkage holes in the product with thick wall thickness and isolated characteristics during the alloy die-casting process, the air at this location can be effectively enhanced. The internal density of the product can be effectively enhanced by extracting the air, and the pores in the die-casting can be eliminated or significantly reduced, so as to improve the mechanical properties and surface quality of the die-casting, reduce the local pore content, effectively reduce the porosity of the product, and improve the qualified rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a first cross-sectional structural schematic diagram of the present invention; Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle; Figure 3 It is a schematic diagram of the three-dimensional structure of the front pipe sleeve in the present invention; Figure 4 Schematic diagram of the cross-sectional structure of the front section pipe sleeve in the present invention Figure 5 It is a second structural schematic diagram of the present invention; Figure 6 for Figure 5 Schematic diagram of the enlarged structure at point B in the middle. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below with reference to the accompanying drawings.

[0015] As shown in the figure, a local extrusion device for a vehicle subframe mold includes a slider 1, an extrusion pin 2 and an extrusion cylinder 8. An extrusion hole 11 connected to the mold cavity of the mold is arranged in the slider 1. The extrusion hole 11 corresponds to a position where the wall thickness of the product is thick and needs to be compensated for shrinkage. An extrusion pin 2 is movably arranged in the extrusion hole 11. The extrusion pin 2 is connected to the extrusion cylinder 8. The extrusion pin 2 is driven by the extrusion cylinder 8 to move in the extrusion hole 11. An exhaust mechanism for extracting air in the extrusion hole 11 is arranged between the slider 1 and the extrusion pin 2.

[0016] In this specific embodiment, the exhaust mechanism includes an exhaust sleeve 3, which is fixedly arranged in the extrusion hole 11, and has a through cavity 31 for the extrusion pin 2 to be movably installed. The extrusion pin 2 can be movably arranged in the through cavity 31 and has a gap between the through cavity 31 to form a first air passage 301. A second air passage 302 is arranged between the exhaust sleeve 3 and the extrusion hole 11. The exhaust sleeve 3 is provided with an air hole 303 for connecting the first air passage 301 with the second air passage 302. The exhaust sleeve 3 is sealed and connected with an exhaust seat 4 at the rear end. The exhaust seat 4 is provided with an exhaust channel 40 connected to the first air passage 301, and an exhaust pipe (not shown in the figure) is connected to the exhaust channel 40. The above-mentioned exhaust mechanism has a simple structure, which can ensure that the extrusion pin 2 can move forward and backward stably, and can continuously exhaust air for the local area to reduce the air content in the local area of ​​the mold, thereby effectively improving the qualified rate of the product.

[0017] In this specific embodiment, the slider 1 includes a slider body 101 and a slider seat 102, the slider seat 102 is fixedly arranged at the rear end of the slider 1, and the extrusion hole 11 passes through the slider body 101 and the slider seat 102; The exhaust pipe sleeve 3 includes a front pipe sleeve 31 and a rear pipe sleeve 32 which are arranged in sequence from front to back in the slider body 101 and the slider seat 102, and the exhaust seat 4 is fixedly arranged in the slider seat 102; The front section pipe sleeve 31 includes a positioning and mounting portion 311, an introduction portion 312 and a main body portion 313 which are arranged in sequence from front to back. The positioning and mounting portion 311 is tightly fixed in the extrusion hole 11. The positioning and mounting portion 311 has a chip flat end surface 3111. A second air passage 302 is formed between the chip flat end surface 3111 and the extrusion hole 11, the introduction portion 312 and the extrusion hole 11, and the main body portion 313 and the extrusion hole 11. Air holes 303 are respectively provided on the introduction portion 312 and the main body portion 313. A first sealing member M1 is provided between the rear end of the main body portion 313 and the extrusion hole 11. The front end of the exhaust sleeve 3 is fixedly installed in the slider 1 by the positioning and mounting part 311 arranged at the front end of the exhaust sleeve 3. At the same time, a flat end surface 3111 is arranged on the positioning and mounting part 311 so that the air in the cavity corresponding to the position where the wall thickness of the product corresponding to the extrusion hole 11 is thick and needs to be compensated can enter the first air passage 301 to be extracted outward. The structure is simple and one thing can be used for multiple purposes. The air hole 303 arranged on the introduction part 312 is mainly used to allow the air from the front end of the cavity to enter the first air passage 301. The air hole 303 arranged on the main body 313 is used to allow the air between the exhaust sleeve 3 and the extrusion hole 11 to enter the first air passage 301, so that as much air as possible can be discharged outward.

[0018] In this specific embodiment, the introduction part 312 is a truncated cone with a small front and a large rear. The outer diameter of the small end of the introduction part 312 matches the outer diameter of the positioning and mounting part 311, and the outer diameter of the large end of the introduction part 312 matches the outer diameter of the main body 313. The introduction part 312 is a truncated cone with a small front and a large rear. In conjunction with the air holes 303 provided on the introduction part 312, the air in the front can be concentrated and quickly passed through the air holes 303 into the first air passage 301 and discharged outward.

[0019] In this specific embodiment, a second seal M2 is provided at the joint of the front pipe sleeve 31 and the rear pipe sleeve 32, and the second seal M2 is used to achieve sealed communication between the front pipe sleeve 31 and the rear pipe sleeve 32. The structure is simple, and air can only be discharged to the outside through a set channel without the risk of internal leakage.

[0020] In this specific embodiment, the exhaust seat 4 has a mounting hole 42 for the extrusion pin 2 to pass through and install, the mounting hole 42 is connected to the through cavity 31, and a seal M3 is provided at the joint between the mounting hole 42 and the through cavity 31, and the sealing M3 is used to achieve the sealed communication between the mounting hole 42 and the through cavity 31. The structure is simple, and the air can only be discharged to the outside through the set channel without the risk of internal leakage.

[0021] In this specific embodiment, a cylinder fixing plate 10 is provided at the rear end of the slider 1, and the cylinder body of the extrusion cylinder 8 is fixedly arranged on the cylinder fixing plate 10, so that the extrusion cylinder 8 can be stably installed.

[0022] In this specific embodiment, the exhaust pipe 5 is connected to a corresponding exhaust device (not shown in the figure).

[0023] The device has strong compatibility and can be applied to single extrusion, double extrusion or even serial exhaust of multiple extrusion pins 2. When there are multiple extrusion pins 2, a plurality of matching exhaust pipe sleeves 3 are arranged on one exhaust seat 4, which are combined and connected in series into one exhaust channel 40.

[0024] During the specific operation, the vacuum mechanism is first used to evacuate the air, and then the extrusion pin 2 is driven by the extrusion cylinder 8 to perform the extrusion operation. The products manufactured by this method will not have pores after post-heat treatment or X-ray irradiation, which effectively improves the manufacturing qualification rate of the products.

Claims

1. A local extrusion device for a sub-frame mold of an automobile, comprising a slider, an extrusion pin and an extrusion cylinder, wherein the slider is provided with an extrusion hole connected to the mold cavity of the mold, the extrusion hole corresponds to a position where the wall thickness of the product is thick and needs to be compensated for shrinkage, the extrusion pin is movably provided in the extrusion hole, the extrusion pin is connected to the extrusion cylinder, and the extrusion pin is driven to move in the extrusion hole by the extrusion cylinder, characterized in that An air extraction mechanism for extracting air from the extrusion hole is arranged between the slider and the extrusion pin.

2. A local extrusion device for an automobile subframe mold as claimed in claim 1, characterized in that The exhaust mechanism includes an exhaust pipe sleeve, which is fixedly arranged in the extrusion hole. The exhaust pipe sleeve has a through cavity for movably installing the extrusion pin. The extrusion pin is movably arranged in the through cavity and has a gap with the through cavity to form a first air passage. A second air passage is arranged between the exhaust pipe sleeve and the extrusion hole. The exhaust pipe sleeve is provided with an air hole for connecting the first air passage and the second air passage. The exhaust pipe sleeve is provided with an exhaust seat in a sealing connection at the rear end. The exhaust seat is provided with an exhaust channel connected to the first air passage, and an exhaust pipe is connected to the exhaust channel.

3. A local extrusion device for an automobile subframe mold as claimed in claim 2, characterized in that The slider comprises a slider body and a slider seat, the slider seat is fixedly arranged at the rear end of the slider, and the extrusion hole passes through the slider body and the slider seat; The exhaust pipe sleeve comprises a front pipe sleeve arranged in the slider body and a rear pipe sleeve arranged in the slider seat in sequence from front to back, and the exhaust seat is fixedly arranged in the slider seat; The front section pipe sleeve includes a positioning and mounting part, an introduction part and a main body which are arranged in sequence from front to back. The positioning and mounting part is tightly fitted and fixed in the extrusion hole. The positioning and mounting part has a flat end face with a chip cut. The second air passage is formed between the flat end face with a chip cut and the extrusion hole, the introduction part and the extrusion hole, and the main body and the extrusion hole. The air holes are respectively arranged on the introduction part and the main body, and a first sealing member is arranged between the rear end of the main body and the extrusion hole.

4. A local extrusion device for a vehicle subframe mold as claimed in claim 3, characterized in that The introduction part is a truncated cone with a small front and a large rear. The outer diameter of the small end of the introduction part matches the outer diameter of the positioning and mounting part, and the outer diameter of the large end of the introduction part matches the outer diameter of the main body.

5. A local extrusion device for a vehicle subframe mold as claimed in claim 3, characterized in that A second sealing member is provided at the joint between the front section pipe sleeve and the rear section pipe sleeve, and a sealed connection between the front section pipe sleeve and the rear section pipe sleeve is achieved through the second sealing member.

6. A local extrusion device for a vehicle subframe mold as claimed in claim 2, characterized in that The vacuum seat has a mounting hole for the extrusion pin to pass through and install, the mounting hole is connected to the through cavity, a sealing member is provided at the joint between the mounting hole and the through cavity, and the sealing member is used to realize the sealed connection between the mounting hole and the through cavity.

7. A local extrusion device for an automobile subframe mold as claimed in claim 1, characterized in that A cylinder fixing plate is arranged at the rear end of the sliding block, and the cylinder body of the extrusion cylinder is fixedly arranged on the cylinder fixing plate.

8. A local extrusion device for a vehicle subframe mold as claimed in claim 2, characterized in that The exhaust pipe is connected with corresponding exhaust equipment.

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