Injection molding water pump impeller trimming device

Abstract

The invention relates to the technical field of automobile part preparation, in particular to an injection molding water pump impeller trimming device which is provided with an impeller positioning sleeve, an impeller can be straightened by placing the impeller in the impeller positioning sleeve, and an impeller supporting column is arranged, so that the impeller is supported at the edge position of a punching opening in the material head punching process, deformation at the punching opening is reduced, and the trimming effect is improved. The material head is inserted into the blanking hole and falls out along the blanking hole after being punched, the movable pressing plate is driven to ascend and descend through the lifting driving device, then the pressing head is driven to punch the material head, the labor intensity of workers is reduced, the machining efficiency is improved, and the product quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts preparation, and particularly to an injection-molded water pump impeller trimming device. Background Art

[0002] Injection molding is one of the main methods for preparing water pump impellers. The impeller body is formed on the impeller bushing and connected to the main shaft of the water pump through the impeller bushing. The sprue is the excess rod produced at the feed port during the injection molding of the impeller and needs to be removed as it is not part of the finished product.

[0003] To remove the sprue, technicians in this field have developed special tools, including an open bow-shaped plate. The impeller body is placed in the opening, then an iron rod is inserted into the impeller bushing, and then the iron rod is struck with a hammer to knock off the sprue, thereby making the break-off port of the impeller body uniform and avoiding excessive deformation of the break-off port. The outer shape of the impeller is inspected, and after grinding the burrs at the break-off port, it is stored for standby.

[0004] The above-mentioned existing technology has a high labor intensity for workers due to continuous knocking during mass production, generates high noise and causes noise pollution in the factory. In the long run, it will affect the hearing of operators; the beat is slow and the efficiency is low, and the time for a single piece in the whole process is long. The product quality depends on the skills of the operators because the inner hole of the bushing is scratched during the knocking process of the iron rod. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an injection-molded water pump impeller trimming device.

[0006] The present invention is achieved through the following technical solutions: An injection-molded water pump impeller trimming device includes a frame. A support device for supporting the injection-molded water pump impeller is arranged on the frame. The support device includes an impeller positioning sleeve. An impeller support column is arranged inside the impeller positioning sleeve. A blanking hole matching with the sprue is arranged inside the impeller support column. A trimming device matching with the impeller support device is also arranged on the frame. The trimming device includes a movable pressure plate. The movable pressure plate is connected with a lifting driving device. A pressure head matching with the sprue is arranged on the movable pressure plate.

[0007] Furthermore, a guiding structure for guiding the movable pressure plate is arranged on the frame. The guiding structure includes guide columns arranged on the frame, and guiding sleeves matching with the guide columns are arranged on the movable pressure plate.

[0008] Furthermore, a limiting structure matching with the movable pressure plate is arranged on the frame. The limiting structure includes limiting columns arranged on the frame, and the movable pressure plate contacts the limiting columns during the downward movement process.

[0009] Further, the impeller support column includes a clamping portion that cooperates with the impeller positioning sleeve. An end bearing portion is provided at the upper end of the clamping portion, and an end bearing surface that cooperates with the impeller body is formed at the upper end of the end bearing portion.

[0010] Further, a guiding opening that cooperates with the impeller body is provided at the upper end of the impeller positioning sleeve.

[0011] Further, a support column is provided on the frame. A fixture body is provided on the support column, and the impeller positioning sleeve is arranged on the fixture body.

[0012] Further, a grinding device for grinding the punching break is also provided on the frame. The grinding device includes a grinding head, and the grinding head is provided with a grinding curved surface that cooperates with the punching break.

[0013] Further, the grinding head is connected with a rotary drive structure. The rotary drive structure includes a drive shaft. A drive block is provided at the end of the drive shaft. A grinding layer is provided on the drive block, and a frictional resistance layer is provided between the grinding layer and the drive block.

[0014] Further, the grinding head is also connected with a support structure that cooperates with the impeller body, and the distance between the impeller body and the grinding head is controlled by the support structure.

[0015] The beneficial effects of the present invention are as follows: By providing an impeller positioning sleeve, the impeller can be centered by placing it in the impeller positioning sleeve. An impeller support column is provided to support the edge position of the punching break during the process of punching off the stock head, reducing the deformation at the punching break. The stock head is inserted into the blanking hole and falls out along the blanking hole after being punched off. The movable pressure plate is driven to move up and down by the lifting drive device, and then the punch is driven to punch off the stock head, reducing the manual labor intensity, improving the processing efficiency, and ensuring the product quality. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of Embodiment 1; Figure 2 It is a schematic front sectional view; Figure 3 It is a schematic structural diagram of the impeller; Figure 4 It is a schematic connection diagram of the impeller positioning sleeve and the impeller support column; Figure 5 It is a schematic structural diagram of the impeller support column Figure 6 It is a schematic structural diagram of Embodiment 2; Figure 7 It is a schematic structural diagram of the grinding head.

[0017] Wherein: 1. Thin-walled cylinder; 2. Cylinder fixing plate; 3. Bolt; 4. Linear bearing; 5. Press head fixing block; 6. Press head; 7. Guide pillar; 8. Base plate; 9. Support pillar; 10. Impeller positioning sleeve; 11. Fixture body; 12. Impeller support pillar; 13. Limit pillar; 14. Cylinder connecting rod; 15. Movable pressure plate; 16. Control valve; 17. Impeller body; 18. Impeller bushing; 19. Sprue; 20. Clamping part; 21. Load-bearing part; 22. Blanking hole; 23. Support leg; 24. Reduction motor; 25. Support seat; 26. Positioning sleeve; 27. Grinding layer; 28. Drive shaft; 29. Drive block; 30. Heightening sleeve; 31. Elastic layer. Detailed implementation manners

[0018] In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1 As Figures 1-5As shown in the figure, an injection-molded water pump impeller trimming device is used to remove the sprue 19 of the injection-molded water pump impeller. It includes a frame. A supporting device for supporting the injection-molded water pump impeller is installed on the frame. Specifically, the frame includes a bottom plate 8. A clamping body 11 is installed on the bottom plate 8 through a supporting column 9. The clamping body 11 is plate-shaped. A blanking space is formed between the clamping body 11 and the bottom plate 8, so that the sprue 19 can be discharged quickly. The supporting device includes an impeller positioning sleeve 10. The impeller positioning sleeve 26 is cylindrical. A positioning cavity matching the outer edge of the impeller body 17 is machined inside the impeller positioning sleeve 10. The impeller positioning sleeve 10 is made of aluminum alloy material, which is convenient for processing, has high structural strength and high corrosion resistance. The positioning cavity is in clearance fit with the outer wall of the impeller body 17. A guiding port matching the impeller body 17 is machined at the upper end of the impeller positioning sleeve 10. An impeller supporting column 9 is installed inside the impeller positioning sleeve 10. A blanking hole 22 matching the sprue 19 is machined inside the impeller supporting column 9. The impeller supporting column 9 includes a clamping part 20 matching the impeller positioning sleeve 10. A bearing part 21 is integrally formed at the upper end of the clamping part 20. A bearing surface matching the impeller body 17 is formed at the upper end of the bearing part 21. The impeller supporting column 9 is made of stainless steel material. An installation port matching the clamping part 20 is machined on the impeller positioning sleeve 10. The clamping part 20 passes downward through the installation port and the clamping body 11. The outer diameter value of the bearing part 21 is greater than the inner diameter value of the installation port, so that the bearing part 21 is supported by the impeller positioning sleeve 10. The sprue 19 is conical. The inner diameter value of the blanking hole 22 is 4-5 mm larger than the maximum outer diameter value of the sprue 19. Thus, during the process of punching off the sprue 19, it supports at the edge position of the punching-off port, reducing the deformation at the punching-off port. The bearing surface is designed by profiling. The bearing surface fits with the lower surface of the impeller body 17, so that the impeller body 17 is stably supported, avoiding the shaking of the impeller body 17 during the punching-off process, and thus ensuring that the punching-off port is neat. During the test, it was tried to machine the upper edge of the blanking hole 22 into a blade shape with a right-angled cross-section and close to the root of the sprue 19 to achieve the purpose of quickly cutting off the connection between the sprue 19 and the punching-off port, so that the punching-off port is neat. It was found through testing that during the punching-off process, due to the rapid deformation of the edge of the punching-off port during the punching-off process, high heat is generated, and irregular dot-shaped molten substances are formed during high-frequency use, which requires high-frequency cleaning. And due to the large instantaneous punching-off force, the edge of the punching-off port is not evenly stretched, and the fracture lines on the end face of the punching-off port are not neat. In this application, the upper edge of the blanking hole 22 is machined into an inclined surface, thus forming a punching-off buffer zone, so that the edge of the punching-off port is fully stretched. The height value of the buffer zone is 3-4 times the wall thickness value of the punching-off port, so that the punching-off port dissipates heat quickly. There is no adhesion of molten substances on the upper end of the blanking hole 22 after long-term use, and a thin punching-off residue is formed at the punching-off port, which is convenient for grinding and trimming. And the bearing part 21 is made of stainless steel material, and has poor adhesion with the impeller material.

[0021] A trimming device matched with the supporting device is also installed on the frame. The trimming device includes a movable pressing plate 15, and the movable pressing plate 15 is connected with a lifting driving device. A pressing head 6 matched with the blank 19 is installed on the movable pressing plate 15. Specifically, a guiding structure for guiding the movable pressing plate 15 is installed on the frame. The guiding structure includes a guide post 7 installed on the frame. The guide post 7 and the bottom plate 8 are connected by bolts 3, which is convenient for installation. A guide sleeve matched with the guide post 7 is installed on the movable pressing plate 15. In this embodiment, the guide sleeve selects a linear bearing 4, which is convenient for material selection and can balance the lateral force. The upper end of the guide post 7 is connected with a horizontal cylinder fixing plate 2 by bolts 3. The lifting driving device selects a thin-wall cylinder 1, which has a small volume and can provide a stable punching force. The movable pressing plate 15 is connected with the piston rod of the thin-wall cylinder 1 through a cylinder connecting rod 14. The thin-wall cylinder 1 is connected with a control valve 16 to control the action of the thin-wall cylinder 1. The trimming device includes a downward pressing head 6. The upper end of the pressing head 6 is connected with the movable pressing plate 15 through a pressing head fixing block 5. The pressing head 6 is connected with the pressing head fixing block 5 by threads, so that the height can be adjusted and it is convenient to replace.

[0022] A limiting structure matched with the movable pressing plate 15 is also installed on the frame. The limiting structure includes a limiting post 13 installed on the bottom plate 8. The movable pressing plate 15 contacts the limiting post 13 during the downward movement, so as to control the downward movement stroke of the movable pressing plate 15 and avoid damaging the impeller body 17.

[0023] In this embodiment, there are two impeller positioning sleeves 10, so that two injection-molded water pump impellers can be trimmed simultaneously. During use, first place the injection-molded water pump impeller in the impeller positioning sleeve 10 with the blank 19 downward. The blank 19 itself is conical, and due to the structure of the buffer zone, the blank 19 can be guided, thereby weakening the scraping between the blank 19 and the bearing part 21 and keeping the bearing part 21 clean. During the placement process, the impeller body 17 is guided through the guiding port, so that the impeller body 17 is stably supported by the bearing surface. The lower end surface of the impeller body 17 is attached to the bearing surface. Then, the control valve 16 is used to drive the thin-wall cylinder 1 to act. The action of the thin-wall cylinder 1 drives the pressing head 6 to move downward until it passes through the impeller bushing 18 to break the connection between the impeller body 17 and the blank 19. The blank 19 falls through the blanking hole 22. To facilitate the collection of the blank 19, a material box (not shown in the figure) is placed on the bottom plate 8, and the position of the material box corresponds to that of the blanking hole 22. Since there is a gap between the impeller body 17 and the impeller positioning sleeve 10 and due to the function of the buffer zone, there is no adhesion between the impeller body 17 and the impeller support column 9, which is convenient for the impeller body 17 to be taken out. After the breaking is completed, check whether the impeller body 17 is deformed and grind the breaking port.

[0024] In some embodiments, a buffer spring is installed between the impeller positioning sleeves 10 due to the impeller support columns 9. In the initial state, the outer side of the lower end face of the impeller body 17 is supported by the buffer spring. During the punching process, the impeller body 17 is pushed downward to cooperate with the impeller support columns 9 until the connection between the impeller body 17 and the sprue 19 is punched off. Then, under the action of the buffer spring, the impeller body 17 is pushed upward, which is more convenient to be taken out. The disadvantage is that in some cases, the reaction force of the buffer spring pushes the impeller body 17 to slide upward along the punch head 6, and then tilts. During the reset process of the punch head 6, the impeller body 17 is driven to slide upward, resulting in extrusion between the impeller body 17 and the impeller positioning sleeve 10, which is likely to damage the impeller body 17 with a relatively thin wall thickness.

[0025] Embodiment 2 As Figures 6-7 shown, a trimming device for an injection molded water pump impeller, different from Embodiment 1, further includes a grinding device installed on the frame for grinding the punching port. The grinding device includes a grinding head, and the grinding head has a grinding curved surface that matches the punching port. The grinding head is connected with a rotary drive structure. The rotary drive structure includes a drive shaft 28. The end of the drive shaft 28 is fixedly connected with a drive block 29. A grinding layer 27 is installed on the drive block 29. There is a friction resistance layer between the grinding layer 27 and the drive block 29. Specifically, a support seat 25 is connected to the bottom plate 8 through upward support legs 23. The support seat 25 is made of a plate. A positioning sleeve 26 is installed on the support seat 25. A positioning cavity that matches the impeller body 17 is formed in the middle position of the positioning sleeve 26. The drive shaft 28 passes downward through the bottom of the positioning cavity and is connected with a rotary drive structure. The rotary drive structure selects a reduction motor 24. The reduction motor 24 drives the grinding head to rotate at a speed of 300 - 600 rpm through the drive shaft 28. The grinding layer 27 is 400 - mesh sandpaper, and a 1 - mm silicone is compounded on the back of the sandpaper to form a friction resistance layer. Thus, when the resistance formed between the grinding layer 27 and the impeller body 17 is relatively large, the friction layer rotates by itself to protect the impeller body 17. The grinding curved surface is an arc surface, which matches the shape of the punching port.

[0026] The grinding head is also connected with a supporting structure that cooperates with the impeller body 17. The distance between the impeller body 17 and the grinding head is controlled through the supporting structure. Specifically, the supporting structure includes a heightening sleeve 30 installed in the positioning sleeve 26. The heightening sleeve 30 is made of stainless steel material and is nested in the positioning sleeve 26. An elastic layer 31 with a thickness of 2 mm is pasted on the upper end surface of the heightening sleeve 30 through polyurethane adhesive. The elastic layer 31 is a vulcanized rubber layer, which has good wear resistance and relatively high hardness. During use, the broken impeller body 17 is placed in the positioning sleeve 26 with the broken end facing downwards. By pressing downwards, the broken end contacts the grinding head, and thus the broken end is preliminarily ground and trimmed. The positioning sleeve 26 and the impeller body 17 are in clearance fit, which can prevent the impeller body 17 from tilting and ensure the grinding effect. The outer edge of the impeller body 17 is supported by the elastic layer 31, which provides elastic buffering and frictional resistance at the same time, reduces the rotation of the impeller body 17, and ensures the grinding effect.

[0027] After grinding, check the broken end. For those that are unqualified, perform only one-step grinding with manual tools to ensure quality. The positioning sleeve 26 is made of aluminum alloy material with good heat conduction. To further improve the heat dissipation effect during grinding, heat dissipation through holes (not shown in the figure) are processed on both the positioning sleeve 26 and the heightening sleeve 30.

[0028] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An injection molding water pump impeller dressing device, characterized in that: It includes a frame, on which is provided a supporting device for supporting an injection molding water pump impeller, the supporting device includes an impeller positioning sleeve, an impeller supporting column is arranged in the impeller positioning sleeve, and a blanking hole matching with a material head is arranged in the impeller supporting column. The frame is also provided with a trimming device matching with the impeller supporting device, the trimming device includes a movable pressing plate, the movable pressing plate is connected to a lifting drive device, and a pressing head matching with the material head is arranged on the movable pressing plate.

2. The injection molding water pump impeller dressing device according to claim 1, characterized in that: The frame is provided with a guide structure for guiding the movable pressing plate, the guide structure comprises a guide post arranged on the frame, and the movable pressing plate is provided with a guide sleeve matched with the guide post.

3. The injection molding water pump impeller dressing device according to claim 1, characterized in that: The frame is provided with a limiting structure matched with the movable pressing plate, and the limiting structure comprises a limiting column arranged on the frame, and the movable pressing plate contacts the limiting column during the process of moving downward.

4. The injection molding water pump impeller dressing device according to claim 1, characterized in that: The impeller support column comprises a clamping portion matched with the impeller positioning sleeve, the upper end of the clamping portion is provided with a load-bearing portion, and the upper end of the load-bearing portion forms a load-bearing surface matched with the impeller body.

5. The injection molding water pump impeller dressing device according to claim 1, characterized in that: The upper end of the impeller positioning sleeve is provided with a guide opening matched with the impeller body.

6. The injection molding water pump impeller dressing device according to claim 1, characterized in that: The frame is provided with a supporting column, the supporting column is provided with a clamping body, and the impeller positioning sleeve is provided on the clamping body.

7. The injection molding water pump impeller dressing device according to claim 1, characterized in that: The frame is also provided with a grinding device for grinding the punching opening, wherein the grinding device comprises a grinding head, and the grinding head is provided with a grinding curved surface matching the punching opening.

8. The injection molding water pump impeller dressing device according to claim 7, characterized in that: The grinding head is connected to a rotation driving structure, which includes a driving shaft, a driving block is arranged at the end of the driving shaft, a grinding layer is arranged on the driving block, and a friction resistance layer is arranged between the grinding layer and the driving block.

9. The injection molding water pump impeller dressing device according to claim 8, characterized in that: The grinding head is also connected to a support structure that cooperates with the impeller body, and the distance between the impeller body and the grinding head is controlled by the support structure.

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