TWI817745B - Jig for bicycle fork seat and method of processing using the jig - Google Patents

Abstract

A jig for bicycle fork seat includes a base, a rotatable plate and a clamp device. The base includes a horizontal bottom surface and an inclined top surface, wherein an angle between the bottom surface and the top surface is equal to that between an extending direction of a left or right rib portion of the fork seat and a vertical direction. The rotatable plate is disposed on the top surface of the base and rotates about an axial direction perpendicular to the top surface. The fork seat is secured on the rotatable plate by the clamp device so as to be rotated along with the rotatable plate. A method of processing using the jig is further provided.

Description

Processing jig for bicycle front fork base and processing method using the jig

The present invention relates to a processing jig, and in particular, to a processing jig for a bicycle front fork seat and a processing method using the jig.

The workpiece must be fixed before cutting so that it can be processed stably and maintain good processing accuracy. In addition to providing the function of fixing the workpiece, the jig usually also takes into account the positioning of the workpiece. That is, after the workpiece is fixed on the jig, it is also located in a standard position for the processing machine to set the stroke according to the preset Process it. Accordingly, the workpiece should not be disassembled and refixed during the entire processing process, otherwise it will easily deviate from the standard position and lose processing accuracy.

However, the shape of the bicycle's front fork seat is not square, and it is necessary to mill weight-reducing holes in the ribs extending diagonally on the left and right sides respectively. The conventional jig is not enough, and the holes are milled twice. The workpiece needs to be detached and re-fixed during the process, so it is necessary to develop a special jig corresponding to this processing process.

In order to solve the above problems, the present invention provides a processing jig for fixing a bicycle front fork base, wherein the front fork base has a middle sleeve part, a left sleeve part and a right sleeve part, the middle sleeve The left rib is connected to the left sleeve part, and the right rib is connected to the right sleeve part; the processing jig includes: A base having a horizontal bottom surface and a top surface that is inclined relative to the bottom surface, wherein the angle between the bottom surface and the top surface is equal to the angle between the extension direction of the left rib or the right rib and the vertical direction. angle; A turntable arranged on the top surface of the base, the axis of rotation of which is perpendicular to the top surface, and the front fork seat can be placed on the turntable; A fixing device provided on the turntable is used to fix the front fork base on the turntable, so that the front fork base rotates with the turntable.

In one embodiment, a plurality of the front fork seats can be placed on the turntable.

Preferably, all the front fork seats are fixed on the turntable by a fixing device at the same time, wherein the fixing device includes a left fixing unit that fixes the left sleeve part of all the front fork seats and a left fixing unit that fixes the left sleeve part of all the front fork seats. Right fixing unit of the right sleeve part.

The above-mentioned left fixed unit and the right fixed unit are respectively a piston cylinder, which is connected to a pressing block, and the pressing block can be pushed out in a direction perpendicular to the top surface of the turntable. The pressing block of the left fixed unit presses the entire front fork seat The left sleeve part is pressed and fixed on the turntable, and the pressing block of the right fixing unit presses and fixes the right sleeve part of all front fork seats on the turntable.

Preferably, the turntable is provided with a plurality of left positioning parts for positioning the left sleeve part and a plurality of right positioning parts for positioning the right sleeve part, and the pressing block of the left fixing unit secures all the front fork seats. The left sleeve part is pressed and fixed on the corresponding left positioning part, and the pressing block of the right fixing unit presses and fixes the right sleeve part of all front fork seats on the corresponding right positioning part.

Furthermore, the left positioning part and the right positioning part respectively include a cylinder for extending into the corresponding left sleeve part and the right sleeve part and abutting against the left sleeve part and the right sleeve part. The top end of the sleeve portion opens at the bottom end of the inner flange, and the pressing block is pressed against the top end of the inner flange.

Preferably, two front fork seats can be placed on the turntable, and the two front fork seats are parallel to each other.

Preferably, one side of the turntable is provided with a straight portion flush with the top edge of the base.

The invention further provides a method for processing a bicycle front fork seat using the aforementioned processing jig, which includes: Use the fixing device to fix the two front fork seats on the turntable; Rotate the turntable to move the left ribs of the two front fork seats to a position perpendicular to the horizontal plane; Operate the milling cutter to extend into the middle sleeve part of one of the front fork seats, and mill from the middle sleeve part into the left rib part, and mill through the left sleeve part; Operate the milling cutter to extend into the middle sleeve part of the other front fork seat, and mill from the middle sleeve part into the left rib part, and mill through the left sleeve part; Rotate the turntable to move the right ribs of the two front fork seats to a position perpendicular to the horizontal plane; Operate the milling cutter to extend into the middle sleeve part of one of the front fork seats, and mill from the middle sleeve part into the right rib part, and mill through the right sleeve part; Operate the milling cutter to extend into the middle sleeve part of the other front fork seat, and mill from the middle sleeve part into the right rib part, and mill through to the right sleeve part.

The invention provides a processing jig for fixing a bicycle front fork seat. As shown in Figure 4, the front fork base 5 has an intermediate sleeve portion 51, with a left rib portion 52 and a right rib portion 53 connected to both sides of the middle sleeve portion 51. The other end of the left rib portion 52 is connected to a left rib portion 52. Sleeve part 54, the other end of the right rib part 53 is connected to a right sleeve part 55, wherein the middle sleeve part 51 is higher than the left sleeve part 54 and the right sleeve part 55, so that the left rib The rib portion 52 and the right rib portion 53 are respectively formed with one side high and one side low and extending in an oblique direction.

Please refer to Figures 1 to 3. The processing jig includes a base 1, a turntable 2 and a fixing device 3. The base 1 has a horizontal bottom surface 111 and a top surface 131 that is inclined relative to the bottom surface 111 . In this embodiment, the base 1 has a horizontal bottom plate 11, an inclined support block 12 is provided on the bottom plate 11, and an inclined support plate 13 is provided on the inclined surface of the inclined support block 12, wherein the bottom surface of the bottom plate 11 An angle θ1 is formed between 111 and the top surface 131 of the inclined support plate 13 , and the angle θ1 is the angle between the extension direction and the vertical direction of the left rib 52 (or right rib 53 ) of the front fork base 5 θ2 is equal. Accordingly, when the front fork base 5 is fixed on the fixture of the present invention, the left rib 52 (or the right rib 53) can be placed in an upright direction in the position shown in FIG. 2 .

The turntable 2 is disposed on the top surface 131 of the inclined support plate 13 and has the same inclination angle as the inclined support plate 13 , and its axis of rotation is perpendicular to the top surface 131 . The turntable 2 can be formed in various known ways. The driving mode drives the rotation. The turntable 2 is provided with four positioning parts for positioning the two front fork seats 5, 5', two of which are provided for positioning the left sleeve parts 54, 54', defined as the left positioning part 41, and the other two are provided for positioning the left sleeve parts 54, 54'. One is provided for positioning the right sleeve parts 55 and 55', and is defined as the right positioning part 42. Accordingly, one front fork seat 5 can have its left sleeve portion 54 and right sleeve portion 55 positioned on a set of left positioning portions 41 and right positioning portions 42 respectively, and another front fork seat 5' can have its left sleeve portion 54' and the right sleeve part 55' are respectively positioned on another set of left positioning parts 41 and right positioning parts 42. In addition, in this embodiment, the positions of the four positioning portions on the turntable 2 are set under the condition that the two front fork seats 5, 5' are parallel to each other.

Each of the above positioning parts has a base block 43 fixed on the turntable 2, and a column 44 located on the base block 43. As shown in Figure 5, the column 44 can extend into the left side of the front fork seat 5. In the sleeve part 54 or the right sleeve part 55 , and against the bottom end of an inner flange 56 located at the top opening of the left sleeve part 54 or the right sleeve part 55 .

The fixing device 3 is disposed on the turntable 2 to fix the front fork seats 5 and 5' on the turntable 2, so that the front fork seats 5 and 5' rotate with the turntable 2. In this embodiment, the fixing device 3 includes a left fixing unit 31 and a right fixing unit 32, which are respectively a piston cylinder 33, the end of which is connected to a pressure block 34. The piston cylinder 33 can use air pressure or oil pressure. Or various mechanical transmission methods can be used to drive the pressing block 34 to move in a direction perpendicular to the turntable 2 . As shown in Figure 5, after the front fork base 5 is positioned on the left positioning part 41 and the right positioning part 42 in the aforementioned manner, the piston cylinder 33 can be operated to make the pressure block 34 close to the left sleeve part 54 and The right sleeve part 55 is against the top end of the inner flange 56 . Accordingly, when the cylinder 44 of the left positioning part 41 and the right positioning part 42 is pressed against the bottom end of the inner flange 56 , the left sleeve part 54 and the right sleeve part 55 are clamped respectively. , so that the entire front fork base 5 is fixed on the turntable 2 .

Furthermore, as shown in Figure 6, the range of the pressing block 34 of the left fixing unit 31 extends to the left sleeve portions 54, 54' of the two front fork seats 5, 5', so the operation of the left fixing unit 31 When the piston cylinder 33 is pressed, the pressure block 34 will simultaneously control the left sleeve portions 54, 54' of the two front fork seats 5, 5'. On the other hand, the range of the pressing block 34 of the right fixing unit 32 extends to the right sleeve portions 55, 55' of the two front fork seats 5, 5', so when the piston cylinder 33 of the right fixing unit 32 is operated, the The pressing block 34 will simultaneously control the right sleeve portions 55, 55' of the two front fork seats 5, 5'.

After the two front fork seats 5, 5' are fixed on the turntable 2 through the above structure, the turntable 2 can be operated to rotate the two front fork seats 5, 5' to the position to be processed for processing. The machine's spindle carries a milling cutter to mill out weight-reducing holes. The specific processing method is shown in Figure 7, including: Use the fixing device to fix the two front fork seats on the turntable; Rotate the turntable to move the left ribs of the two front fork seats to a position perpendicular to the horizontal plane; Operate the milling cutter to extend into the middle sleeve part of one of the front fork seats, and mill from the middle sleeve part into the left rib part, and mill through the left sleeve part; Operate the milling cutter to extend into the middle sleeve part of the other front fork seat, and mill from the middle sleeve part into the left rib part, and mill through the left sleeve part; Rotate the turntable to move the right ribs of the two front fork seats to a position perpendicular to the horizontal plane; Operate the milling cutter to extend into the middle sleeve part of one of the front fork seats, and mill from the middle sleeve part into the right rib part, and mill through the right sleeve part; Operate the milling cutter to extend into the middle sleeve part of the other front fork seat, and mill from the middle sleeve part into the right rib part, and mill through to the right sleeve part.

Since the weight reduction holes to be processed are located in the two diagonally extending structural parts of the left rib 52 and the right rib 53 of the front fork base 5, the processing jig of the present invention cuts the top surface 131 of the base 1 and The turntable 2 is designed to have an inclination angle corresponding to the left rib 52 and the right rib 53. Accordingly, after the front fork base 5 is fixed on the turntable 2, as long as the turntable 2 is operated to rotate, as shown in the figure At the specific position shown in 8, the left rib 52 of the front fork base 5 is placed in an upright direction, that is, in a direction perpendicular to the horizontal plane, so that the main shaft of the processing machine can move in an upright direction and perform processing on the left rib 52. Milling holes. After milling the weight-reducing hole of the left rib 52, the turntable 2 can be operated to rotate to another specific position as shown in Figure 10, so that the right rib 53 can be placed in an upright direction for the spindle of the processing machine. This right rib 53 is milled.

Since the processing jig of the present invention can fix two front fork seats 5, 5' to be processed at one time, and they are arranged in parallel, in the processing method of the present invention, the turntable 2 is rotated to a position as shown in Figure 8 At a specific position, the right ribs 53, 53' of the two front fork seats 5, 5' can be placed in an upright direction. Then the main shaft of the processing machine can process the two right ribs in stages as shown in Figures 8 and 9. The ribs 53 and 53' are milled with weight-reducing holes, and then the turntable 2 is rotated to another specific position as shown in Figure 10, so that the left ribs 52 and 52 of the two front fork seats 5 and 5' can be 52' are placed in an upright direction, then the spindle of the processing machine can mill out weight-reducing holes for the two left ribs 52, 52' in stages as shown in Figures 10 and 11, thereby completing the two front fork seats 5, 52'. 5' milling process.

In response to the fact that the left rib 52 and the right rib 53 of the front fork base 5 are not on a common plane (see Figure 6), the turntable 2 can rotate from the left rib 52 to an upright position to the right rib 53 to form an upright position. There are two different angles to choose from in the upright position. In order to ensure that there are no errors in the automatic processing process, a straight part 21 is provided on one side of the turntable 2, and it is defined that the straight part 21 is rotated to be in contact with the base 1. The position where the edges of the top surface 131 are aligned is an initial position. As long as the processing program is started from this position, the entire process can be correctly executed according to the preset rotation angle.

1: Base 11: Bottom plate 12: diagonal support block 13: Inclined support plate 111: Bottom surface 131:Top surface 2:Turntable 21: Straight part 3: Fixtures 31: Left fixed unit 32:Right fixed unit 33:Piston cylinder 34:Block 41: Left positioning part 42: Right positioning part 43:Base block 44:Cylinder 5. 5’: Front fork seat 51: Middle sleeve part 52, 52’: Left rib 53, 53’: right rib 54, 54’: Left sleeve part 55, 55’: Right sleeve part 56:Inner flange θ1, θ2: angle

Figure 1 is a schematic three-dimensional view of the processing jig of the present invention before the front fork seat is fixed; Figure 2 is a schematic side view of the processing jig of the present invention; Figure 3 is a schematic three-dimensional view of the front fork seat after the processing jig of the present invention is fixed; Figure 4 is a schematic cross-sectional view of the fork seat before processing; Figure 5 is a schematic cross-sectional view of the front fork seat when it is fixed by the processing jig of the present invention; Figure 6 is a schematic top view of the front fork seat after the processing jig of the present invention is fixed; Figure 7 is a flow chart of the processing method of the present invention; 8 to 11 are schematic diagrams of the use state of the processing jig of the present invention when implementing the processing method of the present invention.

1: Base

11: Bottom plate

12: diagonal support block

13: Inclined support plate

111: Bottom surface

131:Top surface

2:Turntable

3: Fixtures

31: Left fixed unit

32:Right fixed unit

33:Piston cylinder

34:Block

41: Left positioning part

42: Right positioning part

43:Base block

44:Cylinder

Claims (10)

A processing jig used to fix a bicycle front fork seat, wherein the front fork seat has a middle sleeve part, a left sleeve part and a right sleeve part, the middle sleeve part is connected to a left rib part The left sleeve part is connected to the right sleeve part with a right rib part; the processing jig includes: A base having a horizontal bottom surface and a top surface that is inclined relative to the bottom surface, wherein the angle between the bottom surface and the top surface is equal to the angle between the extension direction of the left rib or the right rib and the vertical direction. angle; A turntable arranged on the top surface of the base, the axis of rotation of which is perpendicular to the top surface, and the front fork seat can be placed on the turntable; A fixing device provided on the turntable is used to fix the front fork base on the turntable, so that the front fork base rotates with the turntable. The processing jig as claimed in claim 1, wherein a plurality of the front fork seats can be placed on the turntable. The processing jig as claimed in claim 2, wherein all the front fork seats are fixed on the turntable by a fixing device at the same time, wherein the fixing device includes a left fixing device that fixes the left sleeve portion of all the front fork seats. unit and a right fixing unit that fixes the right sleeve part of the entire front fork base. The processing jig as described in claim 3, wherein the left fixing unit and the right fixing unit are respectively a piston cylinder, which is connected to a pressing block and can push the pressing block in a direction perpendicular to the turntable. The pressing block of the fixing unit presses and fixes the left sleeve parts of all the front fork seats on the turntable, and the press block of the right fixing unit presses and fixes the right sleeve parts of all the front fork seats on the turntable. The processing jig as described in claim 4, wherein the turntable is provided with a plurality of left positioning parts for positioning the left sleeve part and a plurality of right positioning parts for positioning the right sleeve part, and the left fixing unit The pressing block of the right fixing unit presses and fixes the left sleeve part of all front fork seats on the corresponding left positioning part, and the pressing block of the right fixing unit presses and fixes the right sleeve part of all the front fork seats on the corresponding right positioning part. The processing jig as claimed in claim 5, wherein the left positioning part and the right positioning part respectively include a cylinder for extending into the corresponding left sleeve part and the right sleeve part and against the Located at the bottom end of the inner flange of the top opening of the left sleeve part and the right sleeve part, the pressing block is pressed against the top end of the inner flange. The processing jig as described in any one of claims 2 to 6, wherein two front fork seats can be placed on the turntable, and the two front fork seats are parallel to each other. The processing jig as claimed in claim 1, wherein one side of the turntable is provided with a straight portion flush with the top edge of the base. A method of processing a bicycle front fork seat using the processing jig as described in claim 1, which includes: Use the fixing device to fix the front fork base on the turntable; Rotate the turntable to move the left rib to a position perpendicular to the horizontal plane; Operate the milling cutter to extend into the middle sleeve part, mill from the middle sleeve part into the left rib part, and mill through the left sleeve part; Rotate the turntable to move the right rib to a position perpendicular to the horizontal plane; Operate the milling cutter to extend into the middle sleeve part, mill from the middle sleeve part into the right rib part, and mill through the right sleeve part. A method of processing a bicycle front fork seat using the processing jig described in claim 7, which includes: Use the fixing device to fix the two front fork seats on the turntable; Rotate the turntable to move the left ribs of the two front fork seats to a position perpendicular to the horizontal plane; Operate the milling cutter to extend into the middle sleeve part of one of the front fork seats, and mill from the middle sleeve part into the left rib part, and mill through the left sleeve part; Operate the milling cutter to extend into the middle sleeve part of the other front fork seat, and mill from the middle sleeve part into the left rib part, and mill through the left sleeve part; Rotate the turntable to move the right ribs of the two front fork seats to a position perpendicular to the horizontal plane; Operate the milling cutter to extend into the middle sleeve part of one of the front fork seats, and mill from the middle sleeve part into the right rib part, and mill through the right sleeve part; Operate the milling cutter to extend into the middle sleeve part of the other front fork seat, and mill from the middle sleeve part into the right rib part, and mill through to the right sleeve part.

Images