A spoke stretching preforming and end surface leveling die

Abstract

The present technology provides a spoke stretching preforming and end face leveling die, by which the two processes of spoke stretching preforming and end face leveling can be completed at one workstation with high quality; it comprises a lower die and an upper die which are arranged horizontally and have coaxial center lines, the upper die comprises an upper die frame, an upper die seat, an upper die core and an upper die stripping block which have coaxial center lines, the upper die seat is fixedly connected to the center of the bottom surface of the upper die frame, the upper die core is fixedly connected to the bottom of the upper die seat, and the upper die stripping block is movably arranged in the upper die seat and the upper die core; the lower die comprises a lower die frame, a lower die seat, a lower die core, a supporting forming ring seat and a supporting forming ring of an annular structure, the supporting forming ring is fixedly connected to the upper part of the supporting forming ring seat, the lower die seat is fixedly connected to the upper center of the lower die frame, the lower die core is fixedly connected to the upper part of the lower die seat, and the supporting forming ring and the supporting forming ring seat are movably arranged on the lower die seat and the lower die core.

Description

Technical Field

[0001] The technology relates to the field of cold working tooling, and provides a spoke stretching preforming and end face leveling die, by which the spoke stretching preforming and end face leveling processes can be completed at one station with high quality. Background Art

[0002] Spokes are the parts of a wheel that connect the rim and the hub. As a device that protects the rim and spokes of a vehicle wheel, the spokes are one of the important components of the wheel. They are characterized by a pair of circular cover plates, the diameter of which is close to the diameter of the rim, a hole larger than the wheel axis in the center of the cover plate, an opening near the edge of the cover plate, and an annular wheel plate at the edge of the cover plate, the curved surface of which can fit closely with the curved surface of the rim.

[0003] The spokes are mostly made of plates with good ductility and are made through cold working.

[0004] The thickness of the sheet is 3 ~ 5mm, but the thickness of 4mm is the most commonly used.

[0005] The wheel spoke stretching preforming process is the most important and critical part of the spoke cold working production process. In the prior art, the spokes made by the stretching preforming process have the phenomenon of overflow and loss of the middle material, which affects the stability of the material distribution in the spoke stretching process, causes the strength of each part of the spoke to be uneven, and has the defect of stress concentration, which seriously affects the performance quality of the spoke.

[0006] Based on the above factors, the spoke end surface is uneven. In order to correct this phenomenon, a special spoke end surface leveling process is required, which has a great negative impact on subsequent processing, increases the spoke production cost, and reduces the spoke production efficiency. Summary of the invention

[0007] The purpose of this technology is to provide a spoke stretching preforming and end surface leveling mold, which can be used to complete the two processes of spoke stretching preforming and end surface leveling at a single workstation with high quality.

[0008] The purpose of this technology is to achieve the following technical solutions:

[0009] A spoke stretching preforming and end surface leveling die comprises a lower die and an upper die which are arranged horizontally and have coaxial center lines, wherein the upper die is movably arranged on the upper side of the lower die.

[0010] The upper die comprises an upper die frame, an upper die seat, an upper die core and an upper die stripping block with coaxial center lines. The upper die seat is fixedly connected to the center of the bottom surface of the upper die frame, the upper die core is fixedly connected to the bottom of the upper die seat, and the upper die stripping block is movably arranged in the upper die seat and the upper die core.

[0011] The lower mold includes a lower mold frame, a lower mold base, a lower mold core, a supporting molding ring seat and a supporting molding ring of an annular structure. The supporting molding ring is fixedly connected to the upper part of the supporting molding ring seat, the lower mold base is fixedly connected to the upper center of the lower mold frame, the lower mold core is fixedly connected to the upper part of the lower mold base, and the supporting molding ring and the supporting molding ring seat are movably arranged on the lower mold base and the lower mold core.

[0012] The contour of the lower end of the upper mold core matches the contour of the upper surface of the spoke, and the upper mold core is provided with a convex step on the outer diameter that matches the height of the outer circular end surface of the spoke; the contour of the top end of the lower mold core and the inner ring surface of the support forming ring can match the contour of the lower surface of the spoke.

[0013] When in use, the upper die is fixedly connected to the lower plane of the slide of the machine tool through the upper die frame, and the lower die is fixedly connected to the lower table of the machine tool through the lower die frame. When the machine tool is started, the upper die frame part moves upward with the slide, and the upper die stripping block is in an ejection state relative to the downward movement of the upper die frame.

[0014] The supporting forming ring seat and the supporting forming ring move upward and are ejected relative to the lower mold frame.

[0015] The spoke stretching workpiece is placed in the inner cavity of the support forming ring.

[0016] The machine tool slide moves downward, and the upper die core moves downward along with the upper die frame. The lower plane of the convex step on the outer diameter of the upper die core first contacts the upper end face of the outer circle of the spoke stretching workpiece, and the spoke stretching workpiece is pushed downward until the lower plane in the middle of the spoke stretching workpiece contacts the upper plane of the lower die core, and the spoke stretching workpiece begins to be preformed and deformed.

[0017] The machine tool slide continues to move downward, the upper die core continues to press down the spoke stretching workpiece and compresses the supporting forming ring and the supporting forming ring seat to make it move downward. At the same time, the upper die stripping block begins to contact and press the spoke stretching workpiece until the spoke stretching workpiece is completely pressed into the cavity of the upper and lower die cores to complete the spoke stretching preforming process.

[0018] During the entire stretching and preforming pressing process, the lower plane of the convex step on the outer diameter of the upper die core always presses the upper end face of the outer circle of the spoke stretching workpiece until the stretching and preforming process is completed and the mold is closed. The position of the upper end face of the outer circle of the spoke workpiece is consistent with the designed position and size of the lower plane of the convex step on the outer diameter of the spoke preforming upper die core, so that the height position of the outer diameter end face of the workpiece after the spoke stretching and preforming process is consistent, and the spoke end face leveling process is completed.

[0019] The beneficial effect of this technology is that by using a set of the above-mentioned spoke stretching preforming and end surface leveling molds, the two processes of spoke stretching preforming and end surface leveling can be completed at a single station with high quality.

[0020] As an improvement to the present technology, the width of the convex step 702 convexly provided on the outer diameter of the upper die core and matching the height of the outer cylindrical end surface of the spoke is the thickness of a spoke workpiece plate; a material thickness is 3 to 5 mm, and the thickness is taken as 4 mm.

[0021] This improvement provides a reliable positioning reference for leveling the outer diameter end face of the workpiece in the spoke stretching preforming process.

[0022] As a further improvement of the present technology, the guide sleeve fixedly connected to the upper mold frame is movably arranged on the guide column fixedly connected to the lower mold frame.

[0023] This improvement utilizes the advantages of the guide post slider pair so that the upper die is moved and arranged on the lower die with precise guiding effect.

[0024] As a further improvement of the present technology, a cylinder is vertically arranged in the upper die base and the upper die core, the cylinder body of the cylinder is fixedly connected to the upper die base, and the piston rod is hinged to the upper die stripping block; a limiting device is also arranged between the upper die stripping block and the upper die core to limit the downward limit position of the upper die stripping block.

[0025] This improvement uses a cylinder to drive the upper die stripping block to move up and down and provides reliable and continuous power for the upper die stripping block to press the spokes and stretch the workpiece, and is easy to operate; the limit device can ensure that the upper die stripping block is always moved and set in the upper die seat and the upper die core without detaching, and has high reliability.

[0026] As a further improvement of the present technology, the top ends of movable ejecting rods which are evenly distributed in the circumferential direction and movably arranged in the lower mold frame are in contact with the bottom surface of the supporting molding ring seat.

[0027] This improvement can utilize the hydraulic pad of the machine tool to provide power for the lifting and lowering of the supporting forming ring seat and the supporting forming ring, and is easy to implement.

[0028] As a further improvement of the present technology, threaded holes for connection with a machine tool are provided on both the upper die frame and the lower die frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a structural schematic diagram of a spoke stretching preforming and end surface leveling die.

[0030] Figure 2 The present invention is a schematic diagram of the use of a spoke stretching preforming and end surface leveling die. DETAILED DESCRIPTION

[0031] The present technology is further described below in conjunction with the accompanying drawings:

[0032] See also Figure 1 , Figure 2The spoke stretching preforming and end face leveling die shown in the figure comprises a lower die and an upper die which are arranged horizontally and have a coaxial center line, and the upper die is movably arranged on the upper part of the lower die, and is characterized in that the upper die comprises an upper die frame 1, an upper die seat 5, an upper die core 7 and an upper die stripping block 8 which have a coaxial center line, the upper die seat 5 is fixedly connected to the center of the bottom surface of the upper die frame 1, the upper die core 7 is fixedly connected to the bottom of the upper die seat 5, and the upper die stripping block 8 is movably arranged in the upper die seat 5 and the upper die core 7; the lower die comprises a lower die frame 2, a lower die seat 6, a lower die core 10, a support molding ring seat 11 of an annular structure and a support molding ring seat 12 of an annular structure Ring 12, the supporting molding ring 12 is fixedly connected to the upper part of the supporting molding ring seat 11, the lower mold base 6 is fixedly connected to the upper center of the lower mold frame 2, the lower mold core 10 is fixedly connected to the upper part of the lower mold base 6, the supporting molding ring 12 and the supporting molding ring seat 11 are movably arranged on the lower mold base 6 and the lower mold core 10; the contour of the lower end of the upper mold core 7 is consistent with the contour of the upper surface of the spoke, and the upper mold core 7 is convexly provided with a convex step 702 on the outer diameter that matches the height of the outer circular end face of the spoke; the contour of the top end of the lower mold core 10 and the inner annular surface of the supporting molding ring 12 can be consistent with the contour of the lower surface of the spoke.

[0033] The main bodies of the upper mold frame 1 and the lower mold frame 2 are both rectangular plate structures. A vertical guide column 3 is arranged at each of the four corners of the lower mold frame 2. A vertical light hole is opened at each of the four corners of the upper mold frame 1 to embed a guide sleeve 4 to cooperate with the guide column 3. The upper mold frame 1 and the lower mold frame 2 are connected through the guide column 3 and the guide sleeve 4.

[0034] The upper mold frame 1 and the lower mold frame 2 are both provided with threaded holes (not shown in the figure) for connection with a machine tool.

[0035] A positioning countersunk hole 101 for positioning and installing the upper die base 5 is provided at the center of the lower part of the upper die frame 1 , and the upper die base 5 is fixedly connected to the lower side of the upper die frame 1 using screws.

[0036] A center positioning step 502 is convexly provided at the bottom end of the upper mold base 5, and a center positioning countersunk hole 703 is concavely provided at the top end of the upper mold core 7 to cooperate with the center positioning step 502, and the upper mold core 7 is fixedly connected to the bottom of the upper mold base 5 using screws.

[0037] Step holes are provided in the upper die base 5 and the upper die core 7: a through hole 701 with a countersunk hole on the upper part is provided in the center of the upper die core 7, and a countersunk hole 504 with a mounting hole 503 for mounting the cylinder with screws on the upper part is provided in the center of the upper die base 5. The nominal size of the countersunk hole 504 is equal to the diameter of the through hole 701.

[0038] The upper mold stripping block 8 with a shoulder at the upper end is arranged in the through hole 701 on the upper mold core 7. The shoulder of the upper mold stripping block 8 and the step of the through hole 701 together constitute a limiting device for limiting the downward limit position of the upper mold stripping block.

[0039] The cylinder 9 is vertically fixed to the countersunk hole 501 of the upper die base 5 by means of screws and the mounting hole 503, and the piston rod of the cylinder 9 is hinged to the upper end surface of the upper die stripping block 8 (the specific connection method is not shown in the figure).

[0040] The contour of the lower end of the upper mold core 7 matches the contour of the upper surface of the spoke, and a convex step 702 is provided on the outer diameter to match the height of the outer end surface of the spoke. The width of the convex step 702 is the thickness of a spoke workpiece plate. The material thickness is 3 to 5 mm, and the thickness is 4 mm.

[0041] A center positioning countersunk hole 201 is provided at the center of the lower mold frame 2 , and four through holes 202 are symmetrically distributed on the outer side of the center positioning countersunk hole 201 .

[0042] Two upper and lower center positioning countersunk holes 601 and 1001 which are the same as the center positioning countersunk hole 201 are opened at the center of the lower mold base 6 and one is opened at the bottom of the lower mold core 10 .

[0043] The positioning ring 14 is embedded in the center positioning counterbore 201 and the center positioning counterbore 601 to accurately position the lower die base 6 on the lower die frame 2, and the lower die base 6 is fixedly connected to the lower die frame 2 by screws. The positioning ring 14 is embedded in the center positioning counterbore 601 and the center positioning counterbore 1001 to accurately position the lower die core 10 on the lower die base 6, and the lower die core 10 is fixedly connected to the lower die base 6 by screws.

[0044] The support forming ring seat 11 and the support forming ring 12 are both annular structures. The support forming ring 12 is fixed to the top of the support forming ring seat 11 by screws. The support forming ring seat 11 and the support forming ring 12 are movably arranged on the lower mold seat 6 and the lower mold core 10.

[0045] Four movable ejector rods 13 are movably arranged in the through holes 202 of the lower mold frame 2. The upper ends of the movable ejector rods 13 abut against the lower end surface of the support molding ring seat 11, and the other ends are connected to the hydraulic pad ejector rods of the machine tool.

[0046] When the support forming ring seat 11 and the support forming ring 12 move to the set position along the lower die seat 6 and the lower die core 10, the contour of the top of the lower die core 10 coincides with the contour of the inner ring surface of the support forming ring 12 and the lower surface of the spoke.

[0047] The following describes in detail the use of the spoke stretching preforming and end surface leveling mold in conjunction with the accompanying drawings.

[0048] See also Figure 1 , Figure 2 As shown, when in use, the upper mold frame 1 is connected to the lower plane of the slider of the machine tool, and the lower mold frame 2 is connected to the lower table of the machine tool through the threaded holes using screws.

[0049] Start the machine tool, the upper die follows the slider upward, and the upper die stripping block 8 is in an ejection state under the action of the cylinder 9. The hydraulic pad push rod of the machine tool pushes out the support forming ring seat 11 and the support forming ring 12 of the lower die through four movable push rods 13, and places the spoke stretching workpiece 15 in the inner cavity of the support forming ring 12.

[0050] The machine tool slide moves downward, and the upper mold core 7 moves downward along with the upper mold frame 1. The lower plane of the convex step 702 on the outer diameter of the upper mold core 7 first contacts the upper end surface of the outer circle of the spoke stretching workpiece 15, and the spoke stretching workpiece 15 is pushed downward until the lower plane in the middle of the spoke stretching workpiece 15 contacts the upper plane of the lower mold core 10, and the spoke stretching workpiece 15 begins to be stretched and preformed.

[0051] The machine tool slide continues to move downward, the upper mold core 7 continues to press down the spoke stretching workpiece 15 and compresses the supporting forming ring 12, the supporting forming ring seat 11, the movable ejector rod 13 and the machine tool hydraulic pad to move downward, and at the same time, the upper mold stripping block 8 begins to contact and press the spoke stretching workpiece 15 until the spoke stretching workpiece 15 is completely pressed into the cavity formed by the upper mold core 7, the lower mold core 10 and the supporting forming ring 12 to complete the spoke stretching preforming process.

[0052] During the entire stretching and preforming pressing process, the lower plane of the upper die core 7 outer diameter convex step 702 always presses the outer cylindrical upper end face of the spoke stretching workpiece 15 until the stretching and preforming sub-step is completed and the mold is closed. The position of the outer cylindrical upper end face of the spoke stretching workpiece 15 is consistent with the designed position and size of the lower plane of the upper die core outer diameter convex step 702, so that the height position of the spoke preforming outer diameter end face is consistent, and the spoke end face leveling sub-step is completed.

[0053] The beneficial effects of this technology are:

[0054] By using a set of the spoke stretching preforming and end surface leveling dies, the spoke stretching preforming and end surface leveling processes can be completed at one station with high quality, and the use is convenient.

Claims

1. A spoke stretching preforming and end surface leveling die, comprising a lower die and an upper die arranged horizontally and coaxially with the center line, wherein the upper die is movably arranged above the lower die, and is characterized in that: The upper die comprises an upper die frame, an upper die seat, an upper die core and an upper die stripping block with coaxial center lines, the upper die seat is fixedly connected to the center of the bottom surface of the upper die frame, the upper die core is fixedly connected to the bottom of the upper die seat, and the upper die stripping block is movably arranged in the upper die seat and the upper die core; the lower die comprises a lower die frame, a lower die seat, a lower die core, a support forming ring seat and a support forming ring of an annular structure, the support forming ring is fixedly connected to the upper part of the support forming ring seat, the lower die seat is fixedly connected to the upper center of the lower die frame, the lower die core is fixedly connected to the upper part of the lower die seat, and the support forming ring and the support forming ring seat are movably arranged on the lower die seat and the lower die core; the contour of the lower end of the upper die core is consistent with the contour of the upper surface of the spoke, and the upper die core is convexly provided with a convex step on the outer diameter that matches the height of the outer circular end surface of the spoke; the contour of the top end of the lower die core and the inner annular surface of the support forming ring can be consistent with the contour of the lower surface of the spoke; The width of the convex step convexly arranged on the outer diameter of the upper die core and matching the height of the outer circular end surface of the spoke is the thickness of a spoke workpiece plate; the guide sleeve fixedly connected to the upper die frame is movably arranged on the guide column fixedly connected to the lower die frame.

2. The spoke stretching preforming and end surface leveling die according to claim 1 is characterized in that: A material thickness of 3-5mm.

3. The spoke stretching preforming and end surface leveling die according to claim 1, characterized in that A cylinder is vertically arranged in the upper die base and the upper die core, the cylinder body of the cylinder is fixedly connected to the upper die base, and the piston rod is hinged to the upper die stripping block; a limiting device for limiting the downward limit position of the upper die stripping block is also arranged between the upper die stripping block and the upper die core.

4. The spoke stretching preforming and end surface leveling die according to claim 1, characterized in that: The top ends of movable ejecting rods which are evenly distributed in the circumferential direction and movably arranged in the lower die frame are in contact with the bottom surface of the supporting molding ring seat.

5. The spoke stretching preforming and end surface leveling die according to claim 1, characterized in that: The upper die frame and the lower die frame are both provided with threaded holes for connecting with the machine tool.

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