CN215614433U - Punching tool for V-shaped spinning belt pulley - Google Patents
Punching tool for V-shaped spinning belt pulley Download PDFInfo
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- CN215614433U CN215614433U CN202121692290.2U CN202121692290U CN215614433U CN 215614433 U CN215614433 U CN 215614433U CN 202121692290 U CN202121692290 U CN 202121692290U CN 215614433 U CN215614433 U CN 215614433U
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Abstract
A punching tool for a V-shaped spinning belt pulley comprises an upper die and a lower die; the upper die is provided with a punch and a material returning mechanism; the lower die comprises a lower die plate, a female die and a positioning device, wherein the positioning device comprises a hydraulic chuck which is arranged on the female die in a sliding manner; the outer end of the hydraulic chuck is circumferentially provided with more than two hydraulic clamping jaws, the inner sides of the hydraulic clamping jaws are in a step shape gradually rising from inside to outside, the positioning heads are fixed at the upper parts of the inner sides of the hydraulic clamping jaws, and the head parts of the positioning heads are matched with the tooth groove profile of the outer wall of the V-shaped spinning belt pulley to be processed; the female die is a step-shaped cylinder and comprises a small cylindrical section at the upper end and a large cylindrical section at the lower end. The tooth grooves of the V-shaped belt pulley are automatically clamped by the hydraulic clamping jaws to position and punch, the defect that the V-shaped spinning belt pulley cannot be positioned after punching is overcome, the V-shaped spinning belt pulley can punch after spinning is achieved, and therefore the defects that a center hole is deformed and parts jump greatly due to the fact that the V-shaped spinning belt pulley is punched before spinning are overcome.
Description
Technical Field
The utility model belongs to the technical field of machining of V-shaped spinning belt pulleys of automobile engines, and relates to a punching tool for a V-shaped spinning belt pulley.
Background
The spinning forming technology can be used for manufacturing an integral hollow rotary part. The V-shaped spinning belt pulley is widely applied in an automobile engine, the inner wall and the outer wall of a tooth groove of the V-shaped spinning belt pulley are both in a tooth groove shape and matched with a V-shaped belt, when the spinning belt pulley is used as a crankshaft belt pulley, the spinning belt pulley is assembled at the top end of a crankshaft to serve as power output for the whole engine, and when the spinning belt pulley is used as a fan, a water pump, a motor and other gear trains, the spinning belt pulley is assembled on a corresponding hub to drive corresponding accessories to rotate.
In the production and processing process of the spinning belt pulley, a center hole is punched on a blank generally in the traditional process, then the positioning pin 8' is positioned through the center hole to carry out spinning tooth grooves, when the spinning belt pulley produced by the processing process is assembled at the top end of a crankshaft and used, an engine is often unstable in operation, large in shaking and high in noise, and a part (the part refers to the spinning belt pulley) is short in service life and unstable in operation, abnormal abrasion can be caused, so that the part fails when the design service life is not reached.
Disclosure of Invention
The utility model provides a punching tool for a V-shaped spinning belt pulley, which overcomes the defect that the V-shaped spinning belt pulley cannot be positioned after spinning. Meanwhile, the hydraulic chuck is adopted for clamping, so that the quick replacement of parts of different varieties can be realized, and the automatic clamping is efficient and safe.
The technical scheme of the utility model is as follows: comprises an upper die and a lower die; the upper die is provided with a punch and a material returning mechanism; the lower die comprises a lower die plate, a female die arranged at the central position of the lower die plate and a positioning device matched with the female die, wherein the positioning device comprises a hydraulic chuck matched on the female die in a sliding manner; the outer end of the hydraulic chuck is circumferentially provided with more than two hydraulic clamping jaws, the inner sides of the hydraulic clamping jaws are in a step shape gradually rising from inside to outside, the positioning heads are fixed at the upper parts of the inner sides of the hydraulic clamping jaws, and the head parts of the positioning heads are matched with the tooth groove profile of the outer wall of the V-shaped spinning belt pulley to be processed;
the female die is a stepped cylinder and comprises a small cylindrical section at the upper end and a large cylindrical section at the lower end;
when the hydraulic clamping jaw punching die works, the small cylindrical section extends into an inner cavity of a V-shaped spinning belt pulley to be processed, the upper end face of the small cylindrical section corresponds to the inner bottom face of a mounting web of the V-shaped spinning belt pulley to be processed, the positioning heads of the hydraulic clamping jaws extend into the same circle of tooth grooves in the outer wall of the V-shaped spinning belt pulley to be processed, the axial lead position of a punched hole of the V-shaped spinning belt pulley to be processed is positioned through the tooth grooves, and the lower end faces of a punch head and a material returning mechanism on an upper die correspond to the outer bottom face of the mounting web of the V-shaped spinning belt pulley to be processed. The outer wall of the small cylindrical section is spaced from the tooth groove of the V-shaped spinning belt pulley to be processed, so that interference is prevented. The moving stroke of the jaws on the chuck is 7-10 mm. When in positioning, the range of the clamping force between the positioning head and the tooth groove of the V-shaped spinning belt pulley to be processed is 0.5-3 Mpa.
The positioning head comprises a tail part, a connecting neck and a head part which are connected in sequence, and the rear end of the tail part and the lower surface of the tail part are abutted against steps on the inner side of the hydraulic clamping jaw; the head is a V-shaped head formed by an upper inclined plane and a lower inclined plane, the intersection of the two inclined planes is rounded, the included angle a1 between the upper inclined plane and the upper end face of the connecting neck = the included angle a2 between the lower inclined plane and the lower end face of the connecting neck = a half of the tooth socket angle a of the belt pulley, and the radius of the rounded angle is larger than that of the top of the tooth socket angle. Just so can empty and open, prevent to interfere with the tank bottom, lead to the location inaccurate, upper and lower inclined plane is pressing from both sides tight fit state, and the inclined plane of cooperation in belt pulley tooth's socket will be short than the inclined plane of flute angle, and half is 2/3 of two inclined plane lengths of flute angle, mainly also prevents to interfere, leads to the location inaccurate, and the connecting neck is narrow mainly used for empty opening than the afterbody, prevents to interfere.
The punch comprises a center hole punch, and bolt hole punches are arranged on the periphery of the center hole punch.
The axis of the center hole punch coincides with the axis of the female die, and the axis of the female die coincides with the axis of the hydraulic chuck.
The punching tool comprises an upper die plate with a guide sleeve at the rear side, a die handle for being tightly matched in the upper die plate, an upper padding plate, a fixing plate, a center hole punch, a bolt hole punch, a material returning plate, polyurethane rubber for returning material, a material returning screw, a first assembling screw and a first assembling pin which are assembled together to form an upper die of the punching tool; the central hole punch and the bolt hole punch are assembled in the fixing plate in an interference fit mode, the upper base plate and the fixing plate are assembled in the center of the upper template through the first assembling screw and the first assembling pin, and the first assembling pin is mainly used for preventing the fixing plate from rotating in a working state after assembly. The middle of the stripper plate is provided with a hole matched with the central hole punch and the bolt hole punch, the stripper plate is assembled on the upper template by the stripper screws penetrating through the polyurethane rubber, a group of bolt holes matched with the stripper screws are uniformly distributed on the outer ring of the stripper plate, and when certain pressure is applied to the stripper plate, the stripper plate can move along the central punch and the bolt hole punch relative to the upper template, so that the purpose of stripping is achieved.
The lower die comprises a lower die plate with a guide post at the rear side, a female die, a hydraulic chuck, a hydraulic clamping jaw, a second assembling screw and a second assembling pin, wherein the female die is assembled at the central position of the lower die plate by the second assembling screw and the second assembling pin, and the second assembling pin is mainly used for preventing the female die from rotating in the working state after assembly. The hydraulic chuck is in sliding fit on the female die, the inner diameter of the hydraulic chuck is subjected to finish turning and is in sliding fit with the outer diameter of the lower end of the female die which is subjected to finish turning in the same way, so that the center hole of the female die and the chuck jaw are concentric, the outline of the inclined plane of the head part of the positioning head of the hydraulic jaw is matched with the tooth groove of a workpiece to be machined, and the hydraulic chuck is mainly used for positioning a part during punching.
According to the required blanking force rational selection stamping equipment of work piece, wait to process the required blanking force of V type spinning belt pulley, according to the thickness of processing V type spinning belt pulley and the quantity decision in the hole that needs the blanking, the computational formula is: t isPunching machine= perimeter x material thickness x40 (factor) of all holes to be machined. T isPunching machineThe required blanking force is expressed in kg; perimeter unit of all holes to be machinedIn mm, the thickness of the material is in mm, and 40 is a coefficient.
The height design of the punching tool is matched with the selected equipment, and a die handle for assembling the punching tool is also matched with the selected equipment so as to ensure that the punching tool can be normally assembled on the punching equipment.
The height of the polyurethane rubber is determined according to the height of the punch, after the polyurethane rubber is assembled, the polyurethane rubber is in a free state, the stripper plate is 3-5mm higher than the punch so as to achieve the purpose of stripping, and generally 6 or 8 polyurethane rubber is uniformly distributed around the punch so as to ensure the balance of stripping force. Wherein the material returning force TRetreat=KTPunching machineWherein K = 0.05.
The central hole punch and the bolt hole punch are respectively in clearance fit with the female die, and the clearance of the clearance fit is (10 +/-2)% of the thickness of the material. The gap between them is determined by the thickness of the workpiece being blanked, typically around 10% of the material thickness.
The hydraulic clamping jaws are modified and formed by welding finished hydraulic clamping jaws and then lathing according to the tooth socket profile of a part to be machined. The hydraulic chuck can be universal, and when different parts are switched, only the matched hydraulic clamping jaws need to be replaced.
After the hydraulic clamping jaw and the part to be processed are well matched for clamping, the height of the female die is matched. And after the female die is subjected to flat grinding for many times, the plane of the female die is ensured to be matched with the inner bottom surface of the part.
The hydraulic chuck and the stamping equipment are mutually linked, so that the stamping equipment can not be started when the hydraulic chuck is in an unclamped state, and the safety of personnel and a die is ensured.
Compared with the traditional processing technology of punching and then spinning the V-shaped tooth groove, the blank avoids the influence of spinning on the central hole in the spinning process, and only the roundness of the V-shaped tooth groove needs to be ensured in the spinning. The processing method for processing the V-shaped spinning belt pulley has the advantages that the coaxiality of the center hole and the V-shaped tooth groove of the V-shaped spinning belt pulley is good, the small jumping can be ensured in the using process, and the operation is smooth. The hydraulic chuck not only can realize the switching between the different parts, realizes a dish multi-purpose, reduces the mould cost, and hydraulic chuck and equipment realize the linkage moreover, and is high-efficient safety.
When the V-shaped spinning belt pulley is machined, a method of spinning and punching is adopted, the coaxiality of the upper core mold and the lower core mold of spinning equipment is reduced, the coaxiality of the upper main shaft and the lower main shaft of the spinning equipment is reduced, the requirements on the mold and the equipment are not high, the roundness of the core mold is good only by spinning, the inner core mold and the forming wheel are adopted for spinning through positioning of a product port, then the spinning tooth socket is used for positioning through the method, and the part with good coaxiality of the central hole and the tooth socket can be produced and machined.
Drawings
FIG. 1 is a product processed by a prior art spinning apparatus;
FIG. 2 is a diagram illustrating a state of use of the punching tool of the present invention;
FIG. 3 is a schematic structural diagram of a hydraulic chuck sliding fitted on a female die;
FIG. 4 is a schematic diagram of the structure of a hydraulic chuck and hydraulic jaws;
FIG. 5 is a top view of FIG. 4;
in the figure, 1, an upper template; 2. a die shank; 3. an upper base plate; 4. a fixing plate; 5. a central hole punch; 6. punching heads of bolt holes; 7. a material returning plate; 8. returning rubber; 9. returning the material screw; 10. assembling a first screw; 11. assembling a first pin; 12. a lower template; 13. a female die; 14. a hydraulic chuck; 15. a hydraulic jack catch; 16. assembling a second screw; 17. and assembling a second pin.
Detailed Description
In the spinning process, a positioning pin 8 'is matched with the central hole to position the blank, and 5' is a split inner core die in the figure 1. And forming a splitting line at the splitting position of the split inner core die on the blank after spinning, wherein the splitting line is positioned on the inner wall of the tooth socket of the blank after spinning.
In fig. 2, the outer wall of the V-shaped spinning belt pulley is provided with two stages of tooth grooves. An upper die plate 1 with a guide sleeve at the rear side, a die shank 2 used for being tightly matched in the upper die plate 1, an upper padding plate 3, a fixing plate 4, a center hole punch 5, a bolt hole punch 6, a stripper plate 7, polyurethane rubber 8 used for stripping, a stripping screw 9, an assembly screw I10 and an assembly pin I11 are assembled together to form an upper die of the punching tool; the central hole punch 5 and the bolt hole punch 6 are assembled in the fixing plate 4 in an interference fit mode, the upper padding plate 3 and the fixing plate 4 are assembled in the center position of the upper die plate 1 through the assembling screw I10 and the assembling pin I11, and the assembling pin I11 is mainly used for preventing the fixing plate 4 from rotating in the working state after assembly. Holes matched with the central hole punch 5 and the bolt hole punch 6 are formed in the middle of the stripper plate 7, a group of bolt holes are uniformly distributed in the outer ring of the stripper plate 7, stripper screws 9 penetrate through polyurethane rubber 8 to assemble the stripper plate 7 on the upper die plate 1, and when certain pressure is applied to the stripper plate 7, the stripper plate 7 can move relative to the upper die plate 1 along the central hole punch 5 and the bolt hole punch 6, so that the purpose of stripping is achieved.
The lower die plate 12 with the guide post on the rear side, the female die 13, the hydraulic chuck 14, the hydraulic clamping jaws 15, the second assembling screws 16 and the second assembling pins 17 form a lower die, wherein the female die 13 is assembled at the central position of the lower die plate 12 through the second assembling screws 16 and the second assembling pins 17, and the second assembling pins 17 are mainly used for preventing the female die 13 from rotating in the working state after assembly. The hydraulic chuck 14 is in sliding fit on the female die 13, the inner diameter of the hydraulic chuck is subjected to finish turning and is in sliding fit with the outer diameter of the lower end of the female die which is subjected to finish turning in the same way so as to ensure that a central hole of the female die and a chuck jaw are concentric, and the outline of the inclined surface of the head part of the positioning head 151 of the hydraulic jaw 15 is matched with a tooth groove of a workpiece to be processed and is mainly used for positioning a part during punching.
In fig. 3, 4 and 5, the inclined plane profile of the head part of the positioning head 151 of the hydraulic clamping jaw 15 is matched with the tooth groove of the workpiece to be machined, and the inclined plane profile is mainly used for positioning the part in punching. The positioning head 151 comprises a tail part, a connecting neck and a head part which are connected in sequence, and the rear end of the tail part and the lower surface of the tail part are abutted against steps on the inner side of the hydraulic clamping jaw 15; the head is by the V type head that two upper and lower inclined planes formed, the crossing department fillet in two inclined planes, go up the inclined plane and connect neck up end contained angle a1 angle = down inclined plane and be connected neck down end contained angle a2 angle = the half of the tooth socket angle an of belt pulley, the radius of fillet is greater than the fillet at tooth socket angle top, just so can the idle division, prevent to interfere with the tank bottom, lead to the location inaccurate, upper and lower inclined plane is pressing from both sides tight fit state, the inclined plane of cooperation in belt pulley tooth's socket is than the inclined plane of tooth socket angle and will be short, half is 2/3 of two inclined plane lengths in tooth socket angle, mainly also prevent interfering, lead to the location inaccurate, it is narrower to connect the neck, the main function is idle division, prevent interfering.
Claims (8)
1. The utility model provides a frock of punching a hole of V type spinning belt pulley which characterized in that: comprises an upper die and a lower die; the upper die is provided with a punch and a material returning mechanism; the lower die comprises a lower die plate (12), a female die (13) arranged at the central position of the lower die plate (12) and a positioning device matched with the female die (13), and the positioning device comprises a hydraulic chuck (14) matched on the female die (13) in a sliding manner; the outer end of the hydraulic chuck (14) is circumferentially provided with more than two hydraulic clamping jaws (15), the inner sides of the hydraulic clamping jaws (15) are in a step shape which gradually rises from inside to outside, a positioning head (151) is fixed on the upper part of the inner side of the hydraulic clamping jaws (15), and the head part of the positioning head (151) is matched with the outline of the tooth socket of the outer wall of the V-shaped spinning belt pulley to be processed;
the female die (13) is a step-shaped cylinder and comprises a small cylindrical section at the upper end and a large cylindrical section at the lower end;
when the hydraulic clamping device works, the small cylindrical section extends into an inner cavity of a V-shaped spinning belt pulley to be processed, the upper end face of the small cylindrical section corresponds to the inner bottom face of a mounting web of the V-shaped spinning belt pulley to be processed, the positioning head (151) of each hydraulic clamping jaw (15) extends into the same circle of tooth groove of the outer wall of the V-shaped spinning belt pulley to be processed, the axial lead position of a punched hole of the V-shaped spinning belt pulley to be processed is positioned through the tooth groove, and the lower end faces of a punch head and a material returning mechanism on the upper die correspond to the outer bottom face of the mounting web of the V-shaped spinning belt pulley to be processed.
2. The punching tool for the V-shaped spinning belt pulley according to claim 1, characterized in that: the positioning head (151) comprises a tail part, a connecting neck and a head part which are sequentially connected, and the rear end of the tail part and the lower surface of the tail part are abutted against steps on the inner side of the hydraulic clamping jaw (15); the head is a V-shaped head formed by an upper inclined plane and a lower inclined plane, the intersection of the two inclined planes is rounded, the included angle a1 between the upper inclined plane and the upper end face of the connecting neck = the included angle a2 between the lower inclined plane and the lower end face of the connecting neck = a half of the tooth socket angle a of the belt pulley, and the radius of the rounded angle is larger than that of the top of the tooth socket angle.
3. The punching tool for the V-shaped spinning belt pulley according to claim 1, characterized in that: the punch comprises a center hole punch (5), and bolt hole punches (6) are arranged on the periphery of the center hole punch (5).
4. The punching tool for the V-shaped spinning belt pulley according to claim 3, characterized in that: the axis of the center hole punch (5) coincides with the axis of the female die (13), and the axis of the female die (13) coincides with the axis of the hydraulic chuck (14).
5. The punching tool for the V-shaped spinning belt pulley according to claim 1, characterized in that: an upper die plate (1) with a guide sleeve at the rear side, a die handle (2) used for being tightly matched in the upper die plate (1), an upper base plate (3), a fixing plate (4), a center hole punch (5), a bolt hole punch (6), a stripper plate (7), polyurethane rubber (8) used for stripping, a stripping screw (9), an assembly screw I (10) and an assembly pin I (11) are assembled together to form an upper die of the punching tool; the center hole punch (5) and the bolt hole punch (6) are assembled in the fixing plate (4) in an interference fit mode, the upper base plate (3) and the fixing plate (4) are assembled in the center of the upper die plate (1) through the assembling screw I (10) and the assembling pin I (11), holes matched with the center hole punch (5) and the bolt hole punch (6) are formed in the material returning plate (7), the material returning screw (9) penetrates through the polyurethane rubber (8) to assemble the material returning plate (7) on the upper die plate (1), and a group of bolt holes assembled with the material returning screw (9) in a matched mode are evenly distributed on the outer ring of the material returning plate (7).
6. The punching tool for the V-shaped spinning belt pulley according to claim 1, characterized in that: the lower die comprises a lower die plate (12) with a guide post at the rear side, a female die (13), a hydraulic chuck (14), a hydraulic clamping jaw (15), a second assembling screw (16) and a second assembling pin (17), wherein the female die (13) is assembled at the central position of the lower die plate (12) through the second assembling screw (16) and the second assembling pin (17).
7. The punching tool for the V-shaped spinning belt pulley according to claim 1, characterized in that: the blanking force required by the V-shaped spinning belt pulley to be processed has the following calculation formula: t isPunching machine= circumference x material thickness x40, T of all holes to be machinedPunching machineThe required blanking force is expressed in kg; the circumference unit of all holes to be processed is mm, and the thickness unit of the material is mm;
after the polyurethane rubber (8) is assembled, the polyurethane rubber (8) is in a free state, the stripper plate (7) is 3-5mm higher than the punch, and the stripping force T isRetreat=KTPunching machineWherein K = 0.05.
8. The punching tool for the V-shaped spinning belt pulley according to claim 3, characterized in that: the central hole punch (5) and the bolt hole punch (6) are in clearance fit with the female die (13) respectively, and the clearance of the clearance fit is 10 +/-2% of the thickness of the material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121692290.2U CN215614433U (en) | 2021-07-24 | 2021-07-24 | Punching tool for V-shaped spinning belt pulley |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121692290.2U CN215614433U (en) | 2021-07-24 | 2021-07-24 | Punching tool for V-shaped spinning belt pulley |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215614433U true CN215614433U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121692290.2U Active CN215614433U (en) | 2021-07-24 | 2021-07-24 | Punching tool for V-shaped spinning belt pulley |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215614433U (en) |
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2021
- 2021-07-24 CN CN202121692290.2U patent/CN215614433U/en active Active
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