CN218611273U

CN218611273U - Auxiliary tool for punching timing hole of timing spinning belt pulley

Info

Publication number: CN218611273U
Application number: CN202222644533.6U
Authority: CN
Inventors: 孙芽; 潘从勇; 鄢荣清; 贾锋
Original assignee: Dongfeng Xiangyang Spinning Technology Co Ltd
Current assignee: Dongfeng Xiangyang Spinning Technology Co Ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2023-03-14
Anticipated expiration: 2032-10-09

Abstract

A timing hole punching auxiliary tool for a timing spinning belt pulley comprises an upper die and a lower die which are matched with each other; a timing hole punch and a material returning mechanism are arranged on the upper die; the material returning mechanism comprises a material returning plate, a polyurethane rubber sleeve and a material returning screw; the upper end of the material returning screw is freely inserted into an upper screw hole on the upper template, and the lower end of the material returning screw is fixed at a threaded hole on the outer ring of the material returning plate; the polyurethane rubber sleeve is sleeved in the middle of the material returning screw; the middle part of the stripper plate is provided with a hole matched with the timing hole punch; the lower mould includes lower bolster, die, positioner, has a plurality ofly on the die and each time correct hole corresponding hole in right time hole drift, adopts the utility model discloses whole timing signal hole on waiting to process the spinning belt pulley in right time is gone out to disposable blanking, and is efficient.

Description

Auxiliary tool for punching timing hole of timing spinning belt pulley

Technical Field

The utility model belongs to the technical field of automobile engine spinning belt pulley processing in right time, a punching in right time hole auxiliary fixtures of spinning belt pulley in right time is related to.

Background

The spinning forming technology can be used for manufacturing a timing spinning belt pulley which is widely applied to an automobile electronic injection engine, the timing spinning belt pulley is used as a crankshaft belt pulley and assembled at the top end of a crankshaft to serve as power output for the whole engine, a timing hole of the timing spinning belt pulley acts with a sensor to generate signals and control fuel injection of the engine, and the required precision of the timing spinning belt pulley is high.

The traditional process is realized on a machining center when the timing spinning belt pulley is used for producing and machining a timing hole. The timing spinning belt pulley is assembled at the top end of a crankshaft for use, the defects of unstable running, large shaking and abnormal abrasion of an engine often occur, and the parts fail to reach the designed service life.

Disclosure of Invention

The utility model discloses an overcome prior art's above-mentioned not enough, and provide a punching in right time hole auxiliary fixtures of spinning belt pulley in right time, the signal hole in right time of whole on the spinning belt pulley in right time of waiting to process is once only punched out, and is efficient, the precision is high.

The technical scheme of the utility model is that: comprises an upper die and a lower die which are matched with each other; the upper die is provided with an upper die plate, a punch fixing plate arranged below the upper die plate and a punch assembly; the punch assembly comprises a plurality of timing hole punches which are circumferentially arrayed below the punch fixing plate, and each timing hole punch corresponds to each timing hole on the female die; the lower die comprises a lower die plate, a female die and a positioning device, wherein the positioning device comprises a positioning pin fixing plate, a center positioning pin and a waist-shaped positioning pin which are assembled on the female die, the female die is provided with a plurality of timing holes B2 corresponding to punches of the timing holes, the female die is arranged on the lower die plate, the positioning pin fixing plate is assembled at the upper end of the female die, the upper surface of the female die outside the positioning pin fixing plate forms a positioning surface for positioning an outer amplitude plate of a timing spinning belt pulley to be processed, the side surface of the positioning pin fixing plate forms a positioning circumferential surface for positioning the circumferential inner wall of a belt running tooth of the timing spinning belt pulley to be processed, the center positioning pin and the waist-shaped positioning pin are fixed in the positioning pin fixing plate, the center positioning pin and the waist-shaped positioning pin are respectively matched with a center hole and a waist-shaped hole of the timing spinning belt pulley to be processed, and the timing spinning belt pulley to be processed is fixed in a timing hole punching die through the center positioning pin and the waist-shaped positioning pin.

The upper die is also provided with a material returning mechanism, and the material returning mechanism comprises a material returning plate, a polyurethane rubber sleeve and a material returning screw; the upper end of the material returning screw is freely inserted into an upper screw hole on the upper template, and the lower end of the material returning screw is fixed at a threaded hole on the outer ring of the material returning plate; the polyurethane rubber sleeve is sleeved in the middle of the material returning screw; the middle part of the stripper plate is provided with a hole matched with the timing hole punch; the lower end surfaces of a timing hole punch and a stripper plate of the upper die correspond to the upper surface of an outer amplitude plate of the timing spinning belt pulley to be processed; the polyurethane rubber sleeve is in a natural state: the upper end surface of the polyurethane rubber sleeve is contacted with the upper template, and the lower end surface of the polyurethane rubber sleeve is contacted with the stripper plate; the polyurethane rubber sleeve is in a free state, and the lower surface of the stripper plate is 3-5mm higher than the punch. When the timing hole is punched, the polyurethane rubber sleeve is in a compression state, when the upper die moves back, the compressed force is released, and the processing timing spinning belt pulley wrapped on the punch is withdrawn.

The guide assembly comprises a guide sleeve arranged on the upper template and a guide pillar arranged on the lower template.

The punch fixing plate is arranged below the upper template through an upper backing plate, the female die is arranged at the central position of the lower template through a lower backing plate, a second assembling screw and a second assembling positioning pin, and the lower backing plate is provided with a waste discharging hole matched with the timing hole punch. The waste discharging hole is larger than the timing hole on the female die, so that the waste is convenient to discharge.

According to the required blanking force reasonable selection stamping equipment of work piece, wait to process the required blanking force of spinning belt pulley in right time, according to the thickness of processing spinning belt pulley in right time and the quantity decision in the hole that needs the blanking, the computational formula is: t is _{Punching machine} = circumference x material thickness x40, T of all holes to be machined _{Punching machine} The 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; x denotes a multiplier and 40 is a coefficient. After the polyurethane rubber sleeve is assembled, the polyurethane rubber sleeve is in a free state, the material returning plate is 3-5mm higher than the punch, and the material returning force T is _Retreat =KT _{Punching machine} Wherein K =0.05. The timing hole punch is in clearance fit with the female die, and the clearance of the clearance fit of the two sides is 10 +/-2% of the thickness of the material.

The punching heads are timing hole punching heads, the number of the timing hole punching heads is 60, the number of the timing hole punching heads is 6 degrees, the timing hole punching heads are fixed on a punching head fixing plate in a circumferential array, each timing hole punching head corresponds to each timing hole on the female die, and a certain gap is reserved between each timing hole punching head and each timing hole on the female die; the female die is provided with 60 timing holes to be punched, the distance between every two timing holes is 6 degrees, the timing holes are in a circumferential array, and each hole corresponds to a timing hole punch. Each timing hole has an accurate position relation with the central positioning pin and the kidney-shaped positioning pin, a spacer bar is arranged between each timing hole and the corresponding timing hole, and the width of the spacer bar is consistent with that of the spacer bar of the timing hole on the processed timing belt pulley; the female die is a cylindrical ring, and pin holes corresponding to the third assembling screws and the third assembling pins are formed in the female die; the positioning pin fixing plate is a stepped cylinder and comprises a large cylinder part positioned at the upper part and a small cylinder part positioned at the lower part, the small cylinder part is manually arranged in an inner cavity of the female die and is used for assembling a third assembling screw and a third assembling pin on the female die, and the middle part of the large cylinder part is provided with a mounting hole corresponding to the central positioning pin and the waist-shaped positioning pin.

The reference circle axis of the timing hole punch coincides with the reference circle axis of the timing hole of the female die; the circle center of the reference circle of the timing hole punch is superposed with the circle center of the reference circle B1 of the female die timing hole B2; the circle center of a reference circle B1 of the timing holes B2 coincides with the axis of the central positioning pin, and the waist-shaped positioning pin and the female die timing holes form a fixed angle.

An upper die plate with a guide sleeve, an upper base plate used for being tightly matched in the upper die plate, a fixing plate, a timing hole punching head, a material returning plate, a polyurethane rubber sleeve used for returning material, a material returning screw, a first assembling screw and a first assembling pin are assembled together to form an upper die of the timing hole punching tool; the timing hole punch is assembled in the fixed plate in an interference fit mode, the upper base plate and the fixed plate are assembled in the center of the upper die plate through the first assembling screw and the first assembling pin, a hole matched with the timing hole punch is formed in the middle of the stripper plate, the stripper plate is assembled on the upper die plate through the stripper screws after penetrating through the polyurethane rubber sleeve, and a group of bolt holes assembled with the stripper screws in a matched mode are evenly distributed in the outer ring of the stripper plate. When the timing hole is punched, the polyurethane rubber sleeve is in a compression state, and when the upper die moves back, the compressed force is released, so that the processing timing spinning belt pulley wrapped on the punch is withdrawn; the lower die comprises a lower die plate with a guide pillar, a lower padding plate, a female die, a positioning pin fixing plate, a central positioning pin, a waist-shaped positioning pin, a second assembling screw, a second assembling positioning pin, a third assembling screw and a third assembling pin; the assembling screw II and the assembling locating pin II are used for assembling the female die and the lower backing plate at the central position of the lower template; the guide sleeve and the guide pillar are matched to form a guide assembly, the guide sleeve is arranged in the middle of the upper template in the front-back direction, and the guide pillar is arranged in the middle of the lower template in the front-back direction.

When the tool works, all mounting holes including the center hole and the waist-shaped hole are punched by positioning the inner wall during spinning, so that the tooth grooves and the center hole of the belt pulley can be concentric, then the center hole and the waist-shaped hole are positioned, and the tool is placed in the tool for punching all timing signal holes at one time, so that each timing signal hole has an accurate position relation with the center hole and the waist-shaped hole, and the center of the center hole, the reference circle of the timing hole and the circumference of the belt running tooth groove are ensured to be consistent.

The utility model discloses the stamping equipment phase-match of punching time hole auxiliary fixtures's high design and chooseing for use to guarantee to punch time hole frock and can normally assemble on stamping equipment, the tonnage of equipment can satisfy required blanking power.

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 material stripping, and generally 8 or 12 polyurethane rubber are uniformly distributed around the punch so as to ensure the balance of material stripping force. Wherein the material returning force T _Retreat =KT _{Punching machine} Wherein K =0.05.

The timing hole punch head is in clearance fit with the female die, and the clearance of the clearance fit is the thickness of the material (10 +/-2%). The gap between them is determined by the thickness of the blanked workpiece, which is typically around 10% of the material thickness.

Adopt the utility model discloses punching auxiliary fixtures in right time hole adds man-hour at the mould, with locating pin and the earlier assembly back of die, reprocessing locating hole and hole in right time have guaranteed the precision of mould. During production, the inner wall of the tooth groove (namely the inner wall of the circumference of the belt running tooth) is positioned after spinning, all mounting holes including the central hole and the waist-shaped hole are punched, and then the mounting holes are positioned by the central hole and the waist-shaped hole and placed in a hole punching and timing tool. The center of the central positioning pin is consistent with the center of a reference circle of a timing hole distributed on the female die; the waist-shaped positioning pins and the female die timing holes form a fixed angle, so that the central holes of the timing spinning belt pulley are positioned, and the timing holes are uniformly distributed in a circumferential array by taking the central holes as a reference; with the waist hole location as assisting, guaranteed that the waist hole of timing hole and belt pulley keeps fixed angular relation to guarantee to provide accurate timing signal when the engine is in the operation. All timing signal holes are punched at one time, so that the processing efficiency is high, each timing signal hole produced in the way has an accurate position relation with the central hole and the kidney-shaped hole, and the consistency of the central hole, the reference circle of the timing hole and the circumference center of the belt running tooth socket is ensured.

Drawings

FIG. 1 is a cross-sectional view of a spinning pulley in which a timing hole is to be machined;

FIG. 2 is a top view of a spinning pulley in which a timing hole is to be machined;

FIG. 3 is a diagram illustrating a state of use of the timing hole punching tool of the present invention;

FIG. 4 is a schematic structural diagram of a hole machined together after the female die and the positioning pin fixing plate are assembled;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a cross-sectional view of a spun pulley with a machined timing hole;

FIG. 7 is a schematic view of a spun pulley with a machined timing hole;

in the figure, 1, an upper template; 2. a polyurethane rubber sleeve; 3. returning the material screw; 4. a material returning plate; 5. an upper base plate; 6. a timing hole punch; 7. assembling a first screw; 8. a punch fixing plate; 9. assembling a first positioning pin; 10. a lower template; 11. a lower base plate; 12. assembling a second screw; 13. a female die; 14. fixing a positioning pin plate; 15. assembling a positioning pin III; 16. a center locating pin; 17. a kidney-shaped positioning pin; 18. assembling a third screw; 19. and assembling a second positioning pin.

Detailed Description

During processing, the inner wall of the tooth groove is positioned after spinning, all mounting holes including the central hole and the waist-shaped hole are punched, so that the tooth groove of the belt pulley is concentric with the central hole of the belt pulley, a belt is stable in operation, small in jumping, and meanwhile, a clamping reference is provided for the hole stopping during the back-face punching.

In the drawings 1 and 2, A' is a spinning belt pulley of a timing hole to be processed, and a central hole and a waist hole are formed in a mounting web of the spinning belt pulley.

In fig. 3, 4 and 5, the utility model comprises an upper die and a lower die; the upper die is provided with an upper padding plate 5, a punch fixing plate 8, a timing hole punch 6 and a material returning mechanism, the material returning mechanism comprises a plurality of polyurethane rubber sleeves 2, material returning screws 3 and a material returning plate 4, and the lower end surfaces of the timing hole punch 6 and the material returning plate 4 of the upper die correspond to the upper surface of an outer amplitude plate of the timing spinning belt pulley to be processed. The lower die comprises a lower die plate 10, a lower backing plate 11 and a female die 13 which are arranged at the central position of the lower die plate 10, and a positioning device, wherein the positioning device comprises a positioning pin fixing plate 14 assembled on the female die, a central positioning pin 16 and a waist-shaped positioning pin 17, and the centers of reference circles of timing holes B2 distributed on the central positioning pin 16 and the female die 13 are consistent. B1 is a timing reference circle on the female die. The female die 13 is a cylinder, the upper end of the female die is assembled with a positioning pin fixing plate 14, a central positioning pin 16 and a waist-shaped positioning pin 17 are fixed in the positioning pin fixing plate 14, the two positioning pins are respectively matched with a central hole and a waist-shaped hole of the timing spinning belt pulley to be machined, and the timing spinning belt pulley to be machined is fixed in a timing hole punching die. The female die 13 and the positioning pin fixing plate 14 are assembled by assembling screws and assembling pins, a timing hole in the female die 13 and two holes matched with the positioning pins in the positioning pin fixing plate 14 are machined together, so that the circle center of a reference circle of the timing hole is concentric with the central positioning pin 16, the waist-shaped positioning pin 17 and the female die timing hole form a fixed angle, the assembly can be machined together to ensure the precision of die manufacturing and part machining, the lower end of the positioning pin is assembled with the lower backing plate 11, and the lower backing plate 11 mainly plays a role in protecting the female die 13.

The punch heads are timing hole punch heads 6, the number of the timing hole punch heads 6 is 60, 6 degrees are arranged between every two timing hole punch heads, the timing hole punch heads are fixed on a punch head fixing plate 8 in a circumferential array, each timing hole punch head 6 corresponds to each hole in the female die 13, and a certain gap is reserved between each timing hole punch head and each hole. The female die 13 is provided with 60 timing holes B2 which are needed to be punched, 6 degrees are formed between every two timing holes, the timing holes are in a circumferential array, and each timing hole corresponds to the timing hole punch 6. Each timing hole has an accurate position relation with the central positioning pin 16 and the kidney-shaped positioning pin 17, a spacer rib is arranged between each timing hole and each timing hole, and the width of the spacer rib is consistent with that of the timing hole on the processed timing belt pulley.

The reference circle axis of the timing hole punch 6 is superposed with the reference circle axis of the timing hole of the female die 13; the circle center of the reference circle of the timing hole punch 6 is superposed with the circle center of the reference circle B1 of the timing hole B2 of the female die 13; the circle center of a reference circle B1 of the timing holes B2 coincides with the axis of the central positioning pin 16, and the waist-shaped positioning pin and the timing holes of the female die form a fixed angle.

An upper die plate 1 with a guide sleeve on the middle side, an upper base plate 5 used for being tightly matched in the upper die plate 1, a fixing plate 8, a timing hole punch 6, a material returning plate 4, a polyurethane rubber sleeve 2 used for returning material, a material returning screw 3, an assembly screw I7 and an assembly pin I9 are assembled together to form an upper die of the timing hole punching tool; the timing hole punch 6 is assembled in the fixing plate 8 in an interference fit mode, the upper padding plate 5 and the fixing plate 8 are assembled in the center position of the upper die plate 1 through the first assembling screw 7 and the first assembling pin 9, and the first assembling pin 9 is mainly used for preventing the fixing plate 8 from rotating in the working state after assembly to cause deviation of a die gap. The middle of the stripper plate 4 is provided with a hole matched with the timing hole punch 6, the stripper plate 4 is assembled on the upper backing plate 5 by the stripper screws 3 penetrating through the polyurethane rubber sleeve 2, a group of bolt holes matched with the assembly screws 7 are uniformly distributed in the outer ring of the stripper plate, when the timing hole is punched, the polyurethane rubber sleeve 2 is in a compression state, when the upper die moves back, the compressed force is released, and the processing timing spinning belt pulley wrapped on the timing hole punch 6 is withdrawn.

The lower die comprises a lower die plate 10 with a guide post on the middle side, a lower backing plate 11, a female die 13, a positioning pin fixing plate 14, a center positioning pin 16, a kidney-shaped positioning pin 17, a second assembling screw 12, a second assembling positioning pin 19, a third assembling screw 18 and a third assembling pin 15. The positioning pin fixing plate 14 is assembled on the female die 13 through the third assembling screw 18 and the third assembling pin 15, the positioning pin fixing plate 14 is assembled with the female die 13 and then clamped on a linear cutting device at one time, a timing hole B2 in the female die 13 and two holes B3 and B4 matched with the two positioning pins in the positioning pin fixing plate 14 are machined together in a linear cutting mode, and the two positioning pins are a center positioning pin 16 and a kidney-shaped positioning pin 17. Therefore, the center of the reference circle of the timing hole is concentric with the central positioning pin 16, the waist-shaped positioning pin 17 and the timing hole are in a fixed angle, and the precision of die manufacturing and part processing can be guaranteed by assembling and processing together. The waist-shaped positioning pins 17 and the timing holes B2 of the female die 13 form a fixed angle, so that the timing holes B2 are positioned by using the central holes of the timing spinning belt pulley, and the timing holes B2 are uniformly distributed in a circumferential array by using the central holes as a reference; with waist hole B4 location as assisting, guaranteed that the waist hole of timing hole B2 and belt pulley keeps fixed angular relation to guarantee to provide accurate timing signal when the engine operates. The female die 13 is assembled at the center position of the lower die plate 10 through the other two assembling screws 12 and the second assembling positioning pin 19, and the second assembling positioning pin 19 is mainly used for preventing the female die 13 from rotating in a working state after assembly, so that deviation of a die gap is caused.

Fig. 6 and 7 show a spinning pulley with a timing hole machined. A is a spinning back tooth socket of the spinning belt pulley with a processed timing hole, A1 is a spinning back tooth socket, A2 is a timing hole reference circle, A3 is a center hole of the spinning belt pulley, and A4 is a waist-shaped hole of the spinning belt pulley.

The hole in right time of spinning belt pulley passes through central locating pin 16 and the accurate location of waist shape locating pin 17, through the utility model discloses punching the hole in right time auxiliary fixtures, with the disposable stamping forming in signal hole in right time on the press, every signal hole in right time keeps accurate position relation with centre bore, waist shape hole.

The utility model provides a current spinning belt pulley in right time dashes the poor drawback of hole precision in right time, adopt the location of the tooth's socket inner wall (belt operation tooth circumference inner wall promptly) behind the spinning, the punching press goes out the mounting hole including containing centre bore, waist shape hole, then adopts centre bore and waist shape hole location again, and the timing signal hole is gone out in disposable blanking, and is not only efficient, and the part of processing out moreover can guarantee that centre bore, timing hole reference circle, belt operation tooth's socket circumference center three are unanimous.

Claims

1. The utility model provides a spinning belt pulley's in right time punching hole auxiliary fixtures in right time which characterized in that: comprises an upper die and a lower die which are matched with each other; the upper die is provided with an upper die plate (1), a punch fixing plate (8) arranged below the upper die plate (1) and a punch assembly; the punch assembly comprises a plurality of timing hole punches (6) which are circumferentially arrayed below a punch fixing plate (8), and each timing hole punch (6) corresponds to each timing hole on the female die (13); the lower die comprises a lower die plate (10), a female die (13) and a positioning device, wherein the positioning device comprises a positioning pin fixing plate (14), a central positioning pin (16) and a waist-shaped positioning pin (17) which are assembled on the female die, the female die (13) is provided with a plurality of timing holes B2 corresponding to the timing hole punches (6), the female die (13) is arranged on the lower die plate (10), the positioning pin fixing plate (14) is assembled at the upper end of the female die (13), the upper surface of the female die (13) on the outer side of the positioning pin fixing plate (14) forms a positioning surface for positioning an outer amplitude plate of a timing spinning belt pulley to be machined, the side surface of the positioning pin fixing plate (14) forms a positioning circumferential surface for positioning the circumferential inner wall of the belt running gear of the timing spinning belt pulley to be machined, the central positioning pin (16) and the waist-shaped positioning pin (17) are fixed in the positioning pin fixing plate (14), the central positioning pin (16) and the waist-shaped positioning pin (17) are respectively matched with a central hole and a waist-shaped hole of the timing spinning belt pulley to be machined, and the timing spinning belt to be machined, and fixed in a timing hole die by the central positioning pin (16) and the waist-shaped positioning pin (17).

2. The auxiliary tool for punching the timing hole of the timing spinning pulley as claimed in claim 1, wherein the auxiliary tool comprises: the upper die is also provided with a material returning mechanism, and the material returning mechanism comprises a material returning plate (4), a polyurethane rubber sleeve (2) and a material returning screw (3); the upper end of the material returning screw (3) is freely inserted into an upper screw hole on the upper template (1), and the lower end of the material returning screw (3) is fixed at a threaded hole on the outer ring of the material returning plate (4); the polyurethane rubber sleeve (2) is sleeved in the middle of the material returning screw (3); the stripper plate (4) is provided with a hole matched with the timing hole punch (6); the lower end surfaces of a timing hole punch head (6) and a stripper plate (4) of the upper die correspond to the upper surface of an outer amplitude plate of the timing spinning belt pulley to be processed; the polyurethane rubber sleeve (2) is in a natural state: the upper end surface of the polyurethane rubber sleeve (2) is contacted with the upper template (1), and the lower end surface of the polyurethane rubber sleeve (2) is contacted with the stripper plate (4); the polyurethane rubber sleeve (2) is in a free state, and the lower surface of the stripper plate (4) is 3-5mm higher than the punch.

3. The auxiliary tool for punching the timing hole of the timing spinning belt pulley according to claim 1, characterized in that: the guide assembly comprises a guide sleeve arranged on the upper template and a guide pillar arranged on the lower template.

4. The auxiliary tool for punching the timing hole of the timing spinning belt pulley according to claim 1, characterized in that: the punch fixing plate (8) is arranged below the upper template (1) through an upper backing plate (5), the female die (13) is arranged at the central position of the lower template (10) through a lower backing plate (11), a second assembling screw (12) and a second assembling positioning pin (19), and the lower backing plate (11) is provided with a waste discharge hole matched with the timing hole punch (6).

5. The auxiliary tool for punching the timing hole of the timing spinning belt pulley according to claim 1, characterized in that: the blanking force required by the spinning belt pulley in the right time to be processed has the following calculation formula: t is a unit of _{Punching machine} = circumference x material thickness x40, T of all holes to be machined _{Punching machine} The 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 sleeve (2) is assembled, the polyurethane rubber sleeve (2) is in a free state, the stripper plate (4) is 3-5mm higher than the punch, and the stripping force T is _Retreat =KT _{Punching machine} Wherein K =0.05.

6. The auxiliary tool for punching the timing hole of the timing spinning pulley according to claim 3, characterized in that: the timing hole punch (6) is in clearance fit with the female die (13), and the clearance of the clearance fit of the two sides is 10 +/-2% of the thickness of the material.

7. The auxiliary tool for punching the timing hole of the timing spinning belt pulley according to claim 1, characterized in that: the punching heads are timing hole punching heads (6), the number of the timing hole punching heads (6) is 60, the number of the timing hole punching heads is 6 degrees, the punching heads are fixed on a punching head fixing plate (8), the timing hole punching heads (6) are fixed on the female die (13), each timing hole punching head corresponds to each timing hole, and a certain gap is formed between the timing hole punching heads and the female die; the female die (13) is provided with 60 timing holes which need to be punched, 6 degrees are formed between every two timing holes, the timing holes are in a circumferential array, and each hole corresponds to the timing hole punch (6). Each timing hole has an accurate position relation with the central positioning pin (16) and the kidney-shaped positioning pin (17), a spacer rib is arranged between each timing hole and each timing hole, and the width of the spacer rib is consistent with that of the timing hole on the processed timing belt pulley.

8. The auxiliary tool for punching the timing hole of the timing spinning pulley as claimed in claim 1, wherein the auxiliary tool comprises: the female die (13) is a cylindrical ring, and pin holes corresponding to the assembly screws III (18) and the assembly pins III (15) are formed in the female die (13); the positioning pin fixing plate (14) is a stepped cylinder and comprises a large cylinder part positioned on the upper part and a small cylinder part positioned on the lower part, the small cylinder part is manually arranged in an inner cavity of the female die (13) and is used for arranging an assembling screw III (18) and an assembling pin III (15) which are used for assembling the positioning pin fixing plate (14) on the female die (13) at the outer ring of the large cylinder part, and the middle part of the large cylinder part is provided with an installation hole corresponding to the central positioning pin (16) and the waist-shaped positioning pin (17).

9. The auxiliary tool for punching the timing hole of the timing spinning belt pulley according to claim 1, characterized in that: the reference circle axis of the timing hole punch (6) is superposed with the reference circle axis of the timing hole of the female die (13); the center of a reference circle of the timing hole punch (6) is superposed with the center of a reference circle B1 of a timing hole B2 of the female die (13); the circle centers of reference circles B1 of the timing holes B2 coincide with the axis of the central positioning pin (16), and the kidney-shaped positioning pin and the female die timing hole form a fixed angle.