A processing device and method for processing tapered grooves on the surface of a grooved pin

Abstract

The present invention discloses a processing device and method for a conical groove on a grooved pin surface, belonging to the field of machining technology, and includes a hydraulic press for applying pressure, an extrusion fixture for clamping a workpiece, and an extrusion tool installed in the extrusion fixture; the extrusion fixture includes a bottom plate arranged at the bottom of the processing device and in contact with a workbench, a base installed on one side of the bottom plate, an extrusion tool holder installed at the upper end of the base, a guide block installed at the upper end of the extrusion tool holder, a pressure handle connected to the inside of the base through a shaft, and a movable guide sleeve arranged at the upper end of the guide block; through holes for placing the workpiece are arranged in the middle of the extrusion tool holder, the guide block, and the movable guide sleeve; the extrusion tool is installed on the outer side of the through hole of the extrusion tool holder and the guide block; the device is used to process the conical groove on the surface of the grooved pin. The present invention realizes the one-time forming processing of the conical groove on the surface of the grooved pin, improves the shape and dimensional accuracy of the conical groove, and solves the problems of difficulty in finished product assembly, chip generation, and chip accumulation in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of machining, in particular to a machining device and a machining method for a tapered groove on the surface of a grooved pin. Background Art

[0002] The grooved pin in the engine is installed between the crankshaft and the crankshaft gear for positioning the crankshaft gear. In the prior art, a tool is used to radially extrude the cylindrical pin, thereby forming three half-length conical grooves on its surface.

[0003] Disadvantages of the existing technology:

[0004] (1) The slotted pin is difficult to install. During the installation process, chips are easily generated, piled up, and dropped, resulting in loose fit between the crankshaft and the gear, and easy to fall off after installation;

[0005] (2) The conical groove is obviously wide and deep;

[0006] (3) The deformation caused by extrusion of the tapered groove is large, and the outer circle of the entire tapered groove part changes from a cylindrical shape to a conical shape; it does not meet the requirements of the national standard "GB / T13829.6-2004 Grooved Pin Half-Length Tapered Groove", which should be that the outer circle near the tapered groove changes to a conical shape, while the outer circle of the part away from the tapered groove remains cylindrical. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a processing device and a processing method for a tapered groove on the surface of a grooved pin. The radial extrusion technology is adopted, and by setting a processing device such as a base with an ingenious structure, a pressing handle, an extrusion tool holder, a guide block and an extrusion tool, the tapered groove on the surface of a grooved pin processed by the processing method of the processing device effectively improves the shape and dimensional accuracy of the tapered groove, and solves the problems of difficulty in finished product assembly, chip generation and chip accumulation in the prior art.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] A processing device for a tapered groove on a surface of a grooved pin, comprising a hydraulic press for applying pressure, an extrusion fixture for clamping a workpiece, and an extrusion tool installed in the extrusion fixture; the extrusion fixture comprises a bottom plate arranged at the bottom end of the processing device and in contact with a workbench, a base installed on one side of the bottom plate, an extrusion tool holder installed on the upper end of the base, a guide block installed on the upper end of the extrusion tool holder, a pressure handle connected to the inside of the base through a shaft, and a movable guide sleeve arranged on the upper end of the guide block; a second cylindrical through hole for placing the workpiece is arranged in the middle position of the extrusion tool holder; a first cylindrical through hole for placing the workpiece is arranged in the middle position of the guide block, and a third cylindrical through hole for placing the workpiece is arranged in the middle position of the movable guide sleeve; the extrusion tool is installed on the outside of the second cylindrical through hole of the extrusion tool holder and the first cylindrical through hole of the guide block; the processing device also includes an adjustment block or an adjustment pad.

[0010] A further improvement of the technical solution of the present invention is that: the base plate is a rectangular parallelepiped structure, and one side of the base plate on which the base is mounted is provided with four bolt through holes 1 fixedly connected to the base by means of four hexagon socket head cylindrical screws.

[0011] A further improvement of the technical solution of the present invention is that: the base is a rectangular parallelepiped with a semi-open structure in the middle of the two adjacent ends on the right and lower sides; four bolt blind holes are arranged around the bottom end of the base, which are connected to the bottom plate through four hexagon socket cylindrical head screws; three bolt through holes are evenly arranged in the middle of the base, which are connected to the extrusion tool holder through one hexagon socket cylindrical head screw; a push rod through hole for placing the push rod is opened in the middle position of the top end of the base; and an axial hole for installing the shaft is arranged inside the right open end of the base.

[0012] A further improvement of the technical solution of the present invention lies in that: the extrusion tool holder is a structure in which two sector-shaped platforms are symmetrically cut off on both sides of a cylinder; three rectangular through holes for installing the extrusion tool are evenly arranged on the outside of the cylindrical through hole 2 for placing the workpiece on the extrusion tool holder; a plurality of bolt blind holes 2 for fixing the extrusion tool through hexagon socket cylindrical head screws 5 are arranged in the longitudinal position of the side surfaces of the sector-shaped platforms cut off on both sides; three bolt blind holes 3 connected to the base through hexagon socket cylindrical head screws 1 are arranged at the bottom of the extrusion tool holder; two bolt blind holes 4 connected to the guide block through hexagon socket cylindrical head screws 2 are symmetrically arranged on the left and right sides of the upper outer side of the extrusion tool holder; a pin blind hole 1 for positioning the guide block through a diamond pin is also arranged on the left side of the upper part of the extrusion tool holder; a pin blind hole 2 for positioning the guide block through a cylindrical pin is also arranged on the right side of the upper part of the extrusion tool holder.

[0013] A further improvement of the technical solution of the present invention lies in that: the guide block is a flat cylindrical structure, and three rectangular grooves for installing the extrusion tool are evenly arranged at the bottom end of the guide block on the outside of the cylindrical through hole 1 for placing the workpiece; three screw holes for fixing the extrusion tool through slotted set screws are evenly arranged on the outside of the cylindrical through hole 1 for placing the workpiece; the guide block is symmetrically arranged with two bolt through holes 3 on the left and right outermost sides of the cylindrical through hole 1 for placing the workpiece, which are connected to the extrusion tool holder through hexagon socket head screws 2; a pin through hole 1 is also arranged on the left side of the guide block for positioning with the extrusion tool holder through a diamond pin; a pin through hole 2 is also arranged on the right side of the guide block for positioning with the extrusion tool holder through a cylindrical pin.

[0014] The further improvement of the technical solution of the present invention is that: a pressure rod is arranged at the tail end of the pressure handle, and three hexagon socket head screws with a limiting function are arranged in the middle; the pressure handle is arranged at the front part inside the base and two shaft holes through which the shaft passes are arranged; the front end of the pressure handle also contacts the placement push rod.

[0015] The further improvement of the technical solution of the present invention is that: the number of the extrusion cutters is three; the extrusion cutters have a preset height, a preset thickness and a front blade with a preset angle; the upper width L1 of the extrusion cutters is smaller than the lower width L2.

[0016] The further improvement of the technical solution of the present invention is that: the preset height H of the extrusion tool is 36 mm; the preset thickness δ of the extrusion tool is 3 mm; the preset angle β of the front blade is 60-80°; the upper width L1 of the extrusion tool is 16.8 mm; and the lower width L2 of the extrusion tool is 17.8 mm.

[0017] A method for processing a tapered groove on the surface of a grooved pin, wherein the device for processing a tapered groove on the surface of a grooved pin is used, and the processing method comprises blanking - turning the outer circle, end face, cutting - turning the other end - grinding the outer circle - extruding the groove shape - correcting the shape, repairing burrs - cleaning - inspection - oiling for rust prevention - storage; the characteristic is that the extruding groove shape process comprises the following steps:

[0018] Step 1, prepare the processing device, insert the workpiece after the outer circle is ground into the cylindrical through hole 3 set in the middle position of the movable guide sleeve for placing the workpiece;

[0019] Step 2, measuring the distance h between the top of the workpiece and the top of the movable guide sleeve, and inserting an adjustment block or adjustment pad of a corresponding size according to the h value according to the selection table;

[0020] Step 3, using a pressure head of a hydraulic press to press the workpiece to a position flush with the movable guide sleeve;

[0021] Step 4, remove the movable guide sleeve, and put the adjustment block or adjustment pad selected in step 2 on the workpiece;

[0022] Step 5, continue to press the workpiece to the bottom using the pressure head of the hydraulic press;

[0023] Step 6, remove the processing device from under the hydraulic press, and then use the pressure head of the hydraulic press to press the pressing rod until the workpiece is ejected by the ejector rod;

[0024] Step 7, completing the extrusion of the groove shape on the surface of the workpiece.

[0025] A further improvement of the technical solution of the present invention is that the selection table in step 2 is as follows:

[0026] Adjustment block or adjustment pad selection table

[0027] Serial number h value(mm) Using adjustment blocks or pads 1 4.5-5.5 No. 3 adjustment block 2 5.5-6.5 Adjustment block No. 2 3 6.5-7.5 Adjustment block No. 1 4 7.5-8.5 No need to use 5 8.5-9.5 No. 1 Adjustment Pad 6 9.5-10.5 No. 2 Adjustment Pad 7 10.5-11.5 No. 3 adjustment pad

[0028] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0029] 1. The present invention adopts radial extrusion technology, and realizes one-time forming of the tapered groove on the surface of the grooved pin by setting a processing device such as a base, a pressing handle, an extrusion tool holder, a guide block and an extrusion tool with an ingenious structure, thereby improving the tapered groove, the outer circle shape and the dimensional accuracy of the grooved pin, and solving the problems of difficulty in finished product assembly, chip generation and chip accumulation in the prior art.

[0030] 2. The present invention further ensures the accuracy of the taper groove, outer circle shape and size of the grooved pin by arranging an adjustment block or adjustment pad, a movable guide sleeve, a second bushing, a third bushing and the like in coordination with an extrusion tool, thereby avoiding the accuracy influence caused by human factors during processing operations.

[0031] 3. The present invention effectively solves the problem that the workpiece is difficult to remove after processing by providing a structure of a pressure handle, a pressure rod, a push rod, a bushing three and a hexagon socket head screw three.

[0032] 4. The present invention fully ensures the positioning accuracy of the guide block and the extrusion tool holder by arranging diamond pins and cylindrical pins and installing a bushing in the pin hole, and further lays a foundation for processing the outer circle shape and dimensional accuracy of the tapered groove of the grooved pin.

[0033] 5. The special structural design of the extrusion tool holder in the present invention makes the installation and replacement of the extrusion tool convenient and quick, while also reducing the weight of the processing device, making it more convenient to use.

[0034] 6. The processing method of the present invention uses a processing device, which makes the extrusion groove process simple, fast and efficient, and effectively solves the problem of difficult processing of the tapered groove of the grooved pin.

[0035] 7. The use of various types of hexagon socket head screws and the structural size design of the extrusion tool in the present invention make the processing device exquisite, beautiful and generous in appearance, and the connection is firm and reliable. It has initially laid a solid foundation for improving the taper groove, outer circle shape and dimensional accuracy of the grooved pin and ensured the safety of the processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a cross-sectional view of the overall structure of the present invention;

[0037] Figure 2 is a top view of the present invention;

[0038] Figure 3 is a bottom view of the guide block in the present invention;

[0039] Figure 4 is a side cross-sectional view of the guide block after flipping in the present invention;

[0040] Figure 5 is a top view of the extrusion tool holder in the present invention;

[0041] Figure 6 It is an AA cross-sectional view of the extrusion tool holder in the present invention;

[0042] Figure 7 is a front cross-sectional view of the base in the present invention;

[0043] Figure 8 is a top view of the base in the present invention;

[0044] Fig. 9 It is a BB cross-sectional view of the base in the present invention;

[0045] Fig.10 is a front view of the extrusion tool in the present invention;

[0046] Fig.11 is a top view of the extrusion tool in the present invention;

[0047] Fig.12 It is a CC cross-sectional view of the extrusion tool in the present invention;

[0048] Fig.13 It is a structural schematic diagram of the adjustment block in the present invention;

[0049] Fig.14 It is a structural schematic diagram of the adjustment pad in the present invention;

[0050] Fig.15 It is a schematic diagram of measuring the distance h value in the present invention.

[0051] Among them, 1. Hexagon socket head screw one, 2. Base, 3. Extrusion tool holder, 4. Guide block, 5. Hexagon socket head screw two, 6. Bushing one, 7. Diamond pin, 8. Slotted set screw, 9. Movable guide sleeve, 10. Bushing two, 11. Cylindrical pin, 12. Hexagon socket head screw three, 13. Pressure rod, 14. Pressure handle, 15. Shaft, 16. Bottom plate, 17. Hexagon socket head screw four, 18. Push rod, 19. Hexagon socket head screw five, 20. Adjustment block, 21. Adjustment pad, 22. Extrusion tool. DETAILED DESCRIPTION

[0052] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0053] like Figure 1 , 2As shown, a processing device for a tapered groove on a surface of a grooved pin comprises a hydraulic press for applying pressure, an extrusion fixture for clamping a workpiece, and an extrusion tool 22 installed in the extrusion fixture; the extrusion fixture comprises a bottom plate 16 arranged at the bottom end of the processing device and in contact with a workbench, a base 2 installed on one side of the bottom plate 16, an extrusion tool holder 3 installed on the upper end of the base 2, a guide block 4 installed on the upper end of the extrusion tool holder 3, a pressure handle 14 connected to the inside of the base 2 through a shaft 15, and a movable guide sleeve 9 arranged on the upper end of the guide block 4; a cylindrical through hole 2 for placing the workpiece is arranged in the middle position of the extrusion tool holder 3; a cylindrical through hole 1 for placing the workpiece is arranged in the middle position of the guide block 4; a cylindrical through hole 3 for placing the workpiece is arranged in the middle position of the movable guide sleeve 9; the extrusion tool 22 is installed on the outer side of the cylindrical through hole 2 of the extrusion tool holder 3 and the cylindrical through hole 1 of the guide block 4; the processing device also comprises an adjustment block 20 or an adjustment pad 21. The cylindrical through hole three, the cylindrical through hole one, and the cylindrical through hole two correspond to each other from top to bottom.

[0054] like Figure 1 , 2 As shown, the bottom plate 16 is a rectangular parallelepiped structure, and one side of the bottom plate 16 on which the base 2 is mounted is provided with four bolt through holes 17 fixedly connected to the base 2 via hexagon socket head cylindrical screws 17.

[0055] Specifically, the model of the hexagon socket head screw 17 is M10×20.

[0056] like Figure 7 , 8 As shown in , 9, the base 2 is a rectangular parallelepiped with a semi-open structure in the middle of the two adjacent ends on the right and lower sides; four bolt blind holes 1 are arranged around the bottom end of the base 2, which are connected to the bottom plate 16 through hexagon socket cylindrical head screws 17; three bolt through holes 2 are evenly arranged in the middle of the base 2, which are connected to the extrusion tool holder 3 through hexagon socket cylindrical head screws 1; a push rod through hole for placing the push rod 18 is opened in the middle position of the top end of the base 2; an axial hole 1 for installing the shaft 15 is arranged inside the right open end of the base 2.

[0057] Specifically, the model of the hexagon socket head screw 1 is M10×80.

[0058] like Figure 5 , 6As shown, the extrusion tool holder 3 is a structure in which two sector-shaped platforms are symmetrically cut off on both sides of a cylinder. One end of the cross section of the extrusion tool holder 3 is sector-shaped, and the other end of the cross section of the extrusion tool holder 3 is straight-shaped; the extrusion tool holder 3 is evenly provided with three rectangular through holes for installing the extrusion tool 22 on the outside of the cylindrical through hole 2 for placing the workpiece, and the angles between the rectangular through holes are all 120°; a plurality of blind bolt holes 2 for fixing the extrusion tool 22 through hexagon socket head screws 5 19 are provided in the longitudinal position of the side surfaces where the sector-shaped platforms are cut off on both sides. Generally, two blind bolt holes are arranged on each side; three blind bolt holes 3 are arranged on the bottom of the extrusion tool holder 3, which are connected to the base 2 through hexagon socket head screws 1; two blind bolt holes 4 are arranged symmetrically on the upper outer side of the extrusion tool holder 3, which are connected to the guide block 4 through hexagon socket head screws 25; a blind pin hole 1 is arranged on the left side of the upper part of the extrusion tool holder 3, which is used for positioning with the guide block 4 through a diamond pin 7; a blind pin hole 2 is arranged on the right side of the upper part of the extrusion tool holder 3, which is used for positioning with the guide block 4 through a cylindrical pin 11. The structural arrangement of the extrusion tool holder 3 facilitates the replacement and fixation of the extrusion tool 22.

[0059] Specifically, the model of the hexagon socket head screw 2 5 is M4×12; the model of the hexagon socket head screw 5 19 is M4×10.

[0060] like Figure 3 , 4 As shown, the guide block 4 is a flat cylindrical structure, and the bottom end of the guide block 4 is evenly provided with three rectangular grooves for mounting the extrusion tool 22 on the outside of the cylindrical through hole 1 for placing the workpiece, and the angles α between the rectangular grooves are all 120°; the guide block 4 is evenly provided with three screw holes for fixing the extrusion tool 22 through the slotted set screws 8 on the outside of the cylindrical through hole 1 for placing the workpiece, and the angles between the screw holes are all 120°; the guide block 4 is on the left side of the cylindrical through hole 1 for placing the workpiece The right outermost side is symmetrically provided with two bolt through holes 3 for connecting with the extrusion tool holder 3 through the hexagon socket cylindrical head screw 2 5; the left side of the guide block 4 is also provided with a pin through hole 1 for positioning with the extrusion tool holder 3 through the diamond pin 7; the right side of the guide block 4 is also provided with a pin through hole 2 for positioning with the extrusion tool holder 3 through the cylindrical pin 11; the guide block 4 is also provided with a bushing 2 10 on the outside of the cylindrical through hole 1 for placing the workpiece; the pin through hole 1 of the diamond pin 7 and the pin through hole 2 of the cylindrical pin 11 are both provided with a bushing 1 6. The guide block 4 is provided with bolt through hole 3, pin through hole 1, screw hole, cylindrical through hole 1, pin through hole 2, and bolt through hole 3 from left to right.

[0061] Specifically, the model of the bushing 6 is A4H7×10, the model of the diamond pin 7 is B4f7×8, the model of the slotted set screw 8 is M4×8, and the model of the cylindrical pin 11 is A4f7×8.

[0062] The outer circle size of the guide block 4 and the extrusion tool holder 3 is consistent. The cylindrical through hole 1 for placing the workpiece set in the middle of the guide block 4 is larger than the cylindrical through hole 2 for placing the workpiece set in the middle of the extrusion tool holder 3. The inner part of the cylindrical through hole 1 for placing the workpiece set in the middle of the guide block 4 is placed with a bushing 2 10. The diamond pin 7, the cylindrical pin 11 and the bushing 1 6 are all set to ensure that the cylindrical through hole 1 and the cylindrical through hole 2 for placing the workpiece in the middle of the guide block 4 and the extrusion tool holder 3 are accurately aligned to reduce the error when the workpiece is placed and to ensure the accuracy of the tapered groove on the surface of the machined workpiece. The bushing 2 10 is set to protect the cylindrical through hole 1 for placing the workpiece set in the middle of the guide block 4 and to ensure the accurate positioning of the movable guide sleeve 9. The bushing 2 10 can be replaced.

[0063] like Figure 1 , 2 As shown, the tail end of the pressing handle 14 is provided with a pressing rod 13, and the middle part is provided with a hexagon socket head screw 12 for limiting; the pressing handle 14 is provided with an axial hole 2 at the front part inside the base through which the shaft 15 passes; the front end of the pressing handle 14 is also in contact with a push rod 18, and the push rod 18 is inserted into the push rod through hole opened at the middle position of the top end of the base 2. The length of the push rod 18 is fixedly set according to the size of the processing device and the workpiece. Generally, the top end of the push rod 18 in contact with the workpiece is set to a plane, and the bottom end in contact with the pressing handle 14 is set to a cone; the bottom end of the pressing rod 13 is set to a screw head, which can be screwed into the screw hole opened at the bottom end of the pressing handle 14, so as to facilitate installation and disassembly. After the axial hole 2 on the pressing handle 14 is aligned with the axial hole on the base 2, the shaft 15 is inserted and fixed to the base 2 with bolts. The model of the hexagon socket head screw 12 is M8×12, and the position and displacement of the push rod 18 and the pressing handle 14 are ensured by the limiting effect of the hexagon socket head screw 12. A bushing 3 is also provided inside the push rod through hole on the base 2, that is, outside the push rod 18, and the bushing 3 can not only protect the push rod through hole on the base 2, but also ensure that the push rod 18 ejects the workpiece in an accurate direction.

[0064] like Figure 10-12 As shown, the extrusion cutters 22 are provided in three numbers; the extrusion cutters 22 have a preset height, a preset thickness, and a front blade having a preset angle; the upper width L1 of the extrusion cutter 22 is smaller than the lower width L2. When the extrusion cutter 22 is installed, the front blade can adjust the size of the cylindrical through hole 1 entering the guide block 4 and the cylindrical through hole 2 of the extrusion cutter seat 3 according to the depth of the tapered groove on the surface of the workpiece to be processed.

[0065] Specifically, the preset height H of the extrusion tool 22 is 36 mm, with a tolerance of ±0.05 mm; the preset thickness δ of the extrusion tool 22 is 3 mm, with a tolerance of -0.01 mm, and the preset angle β of the front blade is 60-80°; the upper width L1 of the extrusion tool 22 is 16.8 mm, with a tolerance of ±0.02 mm; the lower width L2 of the extrusion tool 22 is 17.8 mm, with a tolerance of ±0.02 mm. The specifications and dimensions of the extrusion tool 22 can be set according to the size of the workpiece to be processed.

[0066] The size setting of the processing device can be adjusted according to the size of the workpiece to be processed.

[0067] A method for processing a tapered groove on the surface of a grooved pin, wherein the device for processing a tapered groove on the surface of a grooved pin is used, and the processing method comprises blanking - turning the outer circle, end face, cutting - turning the other end - grinding the outer circle - extruding the groove shape - correcting the shape, repairing burrs - cleaning - inspection - oiling for rust prevention - storage; the characteristic is that the extruding groove shape process comprises the following steps:

[0068] Step 1, prepare the processing device, insert the workpiece after the outer circle is ground into the cylindrical through hole 3 of the movable guide sleeve 9; at this time, the bottom end of the workpiece has reached the upper end of the extrusion tool 22;

[0069] Step 2, measuring the distance h between the top of the workpiece and the top of the movable guide sleeve 9 (e.g. Fig.15 As shown), according to the h value, select the adjustment block 20 or adjustment pad 21 of the corresponding appropriate size according to the selection table; in order to ensure that the length of the surface taper groove of the workpiece after processing is consistent, 3 types of adjustment blocks and 3 types of adjustment pads are set, all of which are used to adjust the placement position of the workpiece to improve the processing accuracy.

[0070] It should be noted here that the sizes of the workpieces to be processed are the same, but there will be some deviations after the workpieces are ground on the outer circle and when they are placed in the cylindrical through hole three of the movable guide sleeve 9. In order to ensure the processing accuracy, an adjustment block 20 or an adjustment pad 21 is provided.

[0071] Adjustment block or adjustment pad selection table

[0072] Serial number h value(mm) Using adjustment blocks or pads 1 4.5-5.5 No. 3 adjustment block 2 5.5-6.5 Adjustment block No. 2 3 6.5-7.5 Adjustment block No. 1 4 7.5-8.5 No need to use 5 8.5-9.5 No. 1 Adjustment Pad 6 9.5-10.5 No. 2 Adjustment Pad 7 10.5-11.5 No. 3 adjustment pad

[0073] like Fig.13 As shown, the adjustment block 20 is a cylindrical top cap with a circular groove in the middle of the bottom, and its processing dimensions are: outer diameter of the outer circle is 9mm, inner diameter of the inner circle is 6.5mm, inner height is 6mm, top thickness is 1mm (adjustment block No. 1), 2mm (adjustment block No. 2), 3mm (adjustment block No. 3), and the top thickness tolerance is ±0.1mm; when the h value is 7.5-8.5mm, no adjustment block or adjustment pad is required.

[0074] like Fig.14 As shown, the adjustment pad 21 is a circular gasket with a circular hole in the middle, and its processing dimensions are: the outer diameter of the outer circle is 25mm, the inner diameter of the inner circle is 6.5mm, the gasket thickness is 1mm (adjustment pad No. 1), 2mm (adjustment pad No. 2), 3mm (adjustment pad No. 3), and the gasket thickness tolerance is ±0.1mm.

[0075] Step 3, using the pressure head of a hydraulic press to press the workpiece to a position flush with the movable guide sleeve 9;

[0076] Step 4, remove the movable guide sleeve 9, and put the adjustment block 20 or the adjustment pad 21 selected in step 2 on the workpiece;

[0077] Step 5, continue to press the workpiece to the bottom using the pressure head of the hydraulic press;

[0078] Step 6, remove the processing device from the hydraulic press, and then use the pressure head of the hydraulic press to press the pressing rod 13 until the workpiece is ejected by the ejector rod 18;

[0079] Step 7, complete the extrusion of the groove shape on the surface of the workpiece, and then proceed to the processing of the next workpiece.

[0080] It should be noted that in the description of the present invention, technical terms such as "upper", "lower", "front", "back", "left", "right", "longitudinal", "horizontal", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing and understanding the technical solution of the present invention. The above description does not limit the present invention, and the present invention is not limited to the examples described above. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should be regarded as the scope of protection of the present invention.

[0081] To sum up, the present invention adopts radial extrusion technology and realizes one-time forming processing of the conical groove on the surface of the grooved pin by setting a processing device with a cleverly structured base, a pressing handle, an extrusion tool holder, a guide block and an extrusion tool, thereby improving the shape and dimensional accuracy of the conical groove and solving the problems of difficulty in finished product assembly, chip generation and chip accumulation in the prior art.

Claims

1. A device for processing a tapered groove on the surface of a grooved pin, comprising a hydraulic press for applying pressure, an extrusion fixture for clamping a workpiece, and an extrusion tool (22) installed in the extrusion fixture, characterized in that: The extrusion fixture comprises a bottom plate (16) arranged at the bottom end of the processing device and in contact with the workbench, a base (2) installed on one side of the bottom plate (16), an extrusion tool holder (3) installed on the upper end of the base (2), a guide block (4) installed on the upper end of the extrusion tool holder (3), a movable guide sleeve (9) arranged on the upper end of the guide block (4), and a pressing handle (14) connected to the inside of the base (2) through a shaft (15); the front end of the pressing handle (14) contacts the placement push rod (18), and the rear end of the pressing handle (14) is provided with the pressing rod (13); a cylindrical through hole 2 for placing a workpiece is arranged in the middle position of the extrusion tool holder (3); a cylindrical through hole 1 for placing a workpiece is arranged in the middle position of the guide block (4), and a cylindrical through hole 3 for placing a workpiece is arranged in the middle position of the movable guide sleeve (9); the extrusion tool (22) is installed on the outer side of the cylindrical through hole 2 of the extrusion tool holder (3) and the cylindrical through hole 1 of the guide block (4); The extrusion tool holder (3) is a structure in which two fan-shaped platforms are symmetrically cut off on both sides of a cylinder; three rectangular through holes for mounting the extrusion tool (22) are evenly arranged on the outer side of the cylindrical through hole 2 for placing the workpiece; a plurality of bolt blind holes 2 for fixing the extrusion tool (22) through hexagon socket head screws 5 (19) are arranged in the longitudinal position of the side surfaces of the fan-shaped platforms cut off on both sides; three bolt blind holes 3 connected to the base (2) through hexagon socket head screws 1 (1) are arranged at the bottom of the extrusion tool holder (3); two bolt blind holes 4 connected to the guide block (4) through hexagon socket head screws 2 (5) are symmetrically arranged on the outer side of the upper part of the extrusion tool holder (3); a pin blind hole 1 for positioning the guide block (4) through a diamond pin (7) is also arranged on the left side of the upper part of the extrusion tool holder (3); and a pin blind hole 2 for positioning the guide block (4) through a cylindrical pin (11) is also arranged on the right side of the upper part of the extrusion tool holder (3); The guide block (4) is a flat cylindrical structure, and three rectangular parallelepiped grooves for mounting an extrusion tool (22) are evenly arranged at the bottom end of the guide block (4) on the outside of a cylindrical through hole for placing a workpiece; The extrusion cutters (22) are provided in three numbers; the extrusion cutters (22) have a preset height and a preset thickness; the upper width L1 of the extrusion cutters (22) is smaller than the lower width L2; the preset angle β of the front blade of the extrusion cutters (22) is 60-80°; The processing device also includes an adjustment block (20) or an adjustment pad (21); in order to ensure that the length of the surface taper groove of the workpiece after processing is consistent, it is necessary to measure the distance between the top end of the workpiece and the top end of the movable guide sleeve (9) during processing, select an adjustment block (20) or an adjustment pad (21) of corresponding size and put it on the workpiece to adjust the placement position of the workpiece.

2. A device for processing a tapered groove on the surface of a grooved pin according to claim 1, characterized in that: The bottom plate (16) is a rectangular parallelepiped structure, and one side of the bottom plate (16) on which the base (2) is mounted is provided with four bolt through holes 1 for fixed connection with the base (2) via four hexagon socket head screws (17).

3. The device for processing a tapered groove on the surface of a grooved pin according to claim 1, characterized in that: The base (2) is a rectangular parallelepiped with a half-open structure in the middle of the two adjacent ends on the right and lower sides; four blind bolt holes (1) are arranged around the bottom end of the base (2) and are connected to the bottom plate (16) through four hexagon socket head screws (17); three bolt through holes (2) are evenly arranged in the middle of the base (2) and are connected to the extrusion tool holder (3) through one hexagon socket head screw (1); a push rod through hole for placing a push rod (18) is provided at the middle position of the top end of the base (2); and an axis hole (1) for mounting the axis (15) is arranged inside the right open end of the base (2).

4. A device for processing a tapered groove on the surface of a grooved pin according to claim 1, characterized in that: The guide block (4) is evenly provided with three screw holes for fixing the extrusion tool (22) through slotted set screws (8) on the outer side of the cylindrical through hole 1 for placing the workpiece; the guide block (4) is symmetrically provided with two bolt through holes 3 for connecting with the extrusion tool holder (3) through hexagon socket head screws 2 (5) on the left and right outermost sides of the cylindrical through hole 1 for placing the workpiece; a pin through hole 1 for positioning with the extrusion tool holder (3) through a diamond pin (7) is also provided on the left side of the guide block (4); and a pin through hole 2 for positioning with the extrusion tool holder (3) through a cylindrical pin (11) is also provided on the right side of the guide block (4).

5. The device for processing a tapered groove on the surface of a grooved pin according to claim 1, characterized in that: A third hexagon socket head screw (12) having a limiting function is arranged in the middle of the pressing handle (14); and a second shaft hole for the shaft (15) to pass through is arranged at the front of the pressing handle (14) inside the base (2).

6. The device for processing a tapered groove on the surface of a grooved pin according to claim 1, characterized in that: The upper width L1 of the extrusion tool (22) is 16.8 mm; the lower width L2 of the extrusion tool (22) is 17.8 mm; the preset height H of the extrusion tool (22) is 36 mm; and the preset thickness δ of the extrusion tool (22) is 3 mm.

7. A method for processing a tapered groove on the surface of a grooved pin, wherein a device for processing a tapered groove on the surface of a grooved pin as claimed in any one of claims 1 to 6 is used, and the processing method comprises blanking - turning the outer circle, end face, cutting - turning the other end - grinding the outer circle - extruding the groove shape - correcting the shape, trimming burrs - cleaning - inspection - oiling for rust prevention - storage; characterized in that: The extrusion groove process comprises the following steps: Step 1, prepare the processing device, insert the workpiece after the outer circle is ground into the cylindrical through hole 3 of the movable guide sleeve (9); at this time, the bottom end of the workpiece has reached the upper end of the extrusion tool (22); Step 2, measuring the distance h between the top of the workpiece and the top of the movable guide sleeve (9), and selecting an adjustment block (20) or an adjustment pad (21) of corresponding size according to the h value; the adjustment block (20) is a cylindrical top cap with a circular groove in the middle of the bottom; the adjustment pad (21) is a circular gasket with a circular hole in the middle; Step 3, using a pressure head of a hydraulic press to press the workpiece to a position flush with the movable guide sleeve (9); Step 4, remove the movable guide sleeve (9), and put the adjustment block (20) or adjustment pad (21) selected in step 2 on the workpiece; Step 5, continue to press the workpiece to the bottom using the pressure head of the hydraulic press; Step 6, removing the processing device from under the hydraulic press, and then using the pressure head of the hydraulic press to press the pressing rod (13) until the workpiece is ejected by the ejector rod (18); Step 7, completing the extrusion of the groove shape on the surface of the workpiece.

8. A method for machining a tapered groove on the surface of a grooved pin according to claim 7, characterized in that: In step 2, when the h value is 6.5-7.5 mm, select and use adjustment block No. 1; the outer diameter of the outer circle of adjustment block No. 1 is 9 mm, the inner diameter of the inner circle is 6.5 mm, the inner circle height is 6 mm, and the top thickness is 1 mm; When the h value is 5.5-6.5mm, select and use the No. 2 adjustment block; the No. 2 adjustment block has an outer diameter of 9mm, an inner diameter of 6.5mm, an inner height of 6mm, and a top thickness of 2mm; When the h value is 4.5-5.5mm, select and use the No. 3 adjustment block; the No. 3 adjustment block has an outer diameter of 9mm, an inner diameter of 6.5mm, an inner height of 6mm, and a top thickness of 3mm; When the h value is 7.5-8.5mm, no adjustment block or adjustment pad is required; When the h value is 8.5-9.5 mm, select to use the No. 1 adjustment pad, the outer diameter of the No. 1 adjustment pad is 25 mm, the inner diameter of the inner circle is 6.5 mm, the pad thickness is 1 mm, and the pad thickness tolerance is ±0.1 mm; When the h value is 9.5-10.5 mm, select to use the No. 2 adjustment pad, the outer diameter of the No. 2 adjustment pad is 25 mm, the inner diameter of the inner circle is 6.5 mm, the pad thickness is 2 mm, and the pad thickness tolerance is ±0.1 mm; When the h value is 10.5-11.5 mm, a No. 3 adjustment pad is selected, wherein the outer diameter of the No. 3 adjustment pad is 25 mm, the inner diameter of the inner circle is 6.5 mm, the gasket thickness is 3 mm, and the gasket thickness tolerance is ±0.1 mm.

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