Flange yoke positioning bolt hole machining clamp

Abstract

A flange yoke positioning bolt hole machining clamp comprises a lining plate, a positioning disc, chip removal holes, a positioning supporting device and a pressing device. The two pressing devices and the two positioning and supporting devices are distributed on the outer side of the positioning disc in a cross shape, and a recess is formed in the positioning disc and used for placing a flange yoke blank, that is, the flange yoke blank is limited not to move in the horizontal direction; a chip discharging hole which simultaneously penetrates through the positioning disc and the lining plate is formed in the positioning disc; the positioning and supporting device comprises bases, self-locking oil cylinders and positioning blocks, the bases are fixed to the lining plate, the self-locking oil cylinders extend out of the opposite faces of the two bases, the positioning blocks are arranged at the opposite top ends of the two self-locking oil cylinders, and the two positioning blocks clamp hanging lugs of the flange yoke blank from the two sides; the pressing device is used for pressing the flange yoke blank in the positioning disc and limiting the flange yoke blank not to move in the vertical direction; and meanwhile, the machining precision is high, and the machining efficiency is high.

Description

Technical Field:

[0001] The utility model relates to the technical field of flange fork jigs, and particularly relates to a machining jig for positioning bolt holes of a flange fork. Background Art:

[0002] During the assembly process of a drive shaft, the flange fork requires extremely high positional accuracy of four positioning bolt holes with respect to the outer circle of the body, as well as two lugs, that is, the cross joint pin holes. Firstly, it is necessary to ensure unified installation accuracy for easy assembly. Secondly, it is beneficial to obtain good dynamic balance of the drive shaft under high-speed rotation, thereby reducing the occurrence of drive shaft vibration and obtaining good product performance and service life.

[0003] In the early stage, such jigs were introduced from abroad. Subsequently, in response to customer requirements, after learning from the advantages and disadvantages of foreign products, we successfully developed the first-generation flange fork jig CN201611112573.9. After the product was put into actual production and application, it reached the performance indicators of foreign products. Later, we found on the production site that our previous jig used a V-block to tightly fix the flange fork blank from the bottom upwards. However, the problem is that it takes a bit of time to place the workpiece with this jig. It needs to be placed at the center of the jig, and the clamping action takes a long time, and the speed of replacing parts is slow. If the speed is increased, it is easy to produce defective products, resulting in low work efficiency. Content of the Utility Model:

[0004] In view of this, it is necessary to design a machining jig for positioning bolt holes of a flange fork, which can achieve rapid and accurate positioning and improve labor efficiency.

[0005] A machining jig for positioning bolt holes of a flange fork, used for fixing a flange fork blank, includes: a backing plate, a positioning disk, a chip removal hole, a positioning support device, and a pressing device; the positioning disk is fixed in the middle of the upper surface of the backing plate, and both the positioning support device and the positioning support device are arranged on the upper surface of the backing plate; two positioning support devices are respectively arranged on opposite sides of the positioning disk, and two pressing devices are respectively arranged on opposite sides of the positioning disk. The straight line where the two positioning support devices are located is perpendicular to the straight line where the two pressing devices are located, and the straight line where the intersection point and the geometric center of the positioning disk are located is perpendicular to the surface of the backing plate; there is a recess in the positioning disk for placing the flange fork blank, that is, to limit the horizontal movement of the flange fork blank; a chip removal hole that penetrates both the positioning disk and the backing plate is arranged in the positioning disk, and the chip removal hole penetrates vertically, that is, the penetration direction of the chip removal hole is perpendicular to the surface of the backing plate; the positioning support device includes a base, a self-locking oil cylinder, and a positioning block. The base is fixed on the backing plate, self-locking oil cylinders protrude from the opposite surfaces of the two bases, the two self-locking oil cylinders move relatively, and positioning blocks are arranged at the opposite tops of the two self-locking oil cylinders. The two positioning blocks clamp the lugs of the flange fork blank from both sides; the pressing device presses the flange fork blank against the positioning disk to limit the vertical movement of the flange fork blank.

[0006] Two pressing devices and two positioning and supporting devices are distributed in a cross shape outside the positioning disk. That is, the two pressing devices are respectively arranged at the 12 o'clock and 6 o'clock directions of the positioning disk, and the two positioning and supporting devices are respectively arranged at the 3 o'clock and 9 o'clock directions of the positioning disk. The straight line where the cross intersection of the two pressing devices and the two positioning and supporting devices and the geometric center of the positioning disk is perpendicular to the lining plate. There is a depression with a flat bottom in the positioning disk for placing the bottom surface of the flange fork blank flatly. Four bolt holes need to be drilled on the bottom surface of the flange fork blank, so four chip removal holes are arranged in the positioning disk to leave the drilling positions respectively. The self-locking oil cylinder drives the positioning blocks to approach the lugs of the flange fork blank from both sides. When the positioning blocks on both sides contact the workpiece lugs, the two oil cylinders continue to pressurize, driving the workpiece to shift, that is, the workpiece lugs are tightly combined with the positioning blocks. When the displacement ends and the oil pressure is stable, the locking cylinder locks, and the oil circuit maintains the oil supply state until the processing ends.

[0007] Preferably, the positioning block includes a fixed part and a replacement part. One end of the fixed part is fixedly connected to the self-locking oil cylinder, and the other end is detachably connected to the replacement part.

[0008] For different models of flange fork blanks, the fixed part needs to be replaced according to the situation. The replacement part can be detachably installed on the fixed part by bolts or in the form of a card slot. The fixed part and the replacement part need to be installed firmly to facilitate the stability of the flange fork blank during the drilling process without moving.

[0009] Preferably, the replacement part and the fixed part are connected by the way of a dovetail block and a dovetail groove.

[0010] On this basis, bolts can be used to make the replacement part more stable.

[0011] Preferably, the positioning block is made of a hard material; and the surface in contact with the lug of the flange fork blank is a smooth surface.

[0012] The positioning block is made of a hard material that does not deform, and the surface in contact with the lug of the flange fork blank is smooth, making it more convenient for the positioning block to slide between the lug of the flange fork blank, and enabling the offset workpiece to be rotated to the set correct position faster.

[0013] Preferably, the positioning and supporting device further includes a guide rod. Guide rods are respectively arranged on both sides of the self-locking oil cylinder. The two guide rods are parallel to the self-locking oil cylinder. One end of the guide rod is slidably connected to the base, and the other end is fixedly connected to the positioning block.

[0014] The guide rod makes the sliding action of the self-locking oil cylinder driving the positioning block more stable.

[0015] Preferably, the depression in the positioning disk is circular.

[0016] The four corners of the workpiece are clamped by the circular shape in the positioning disc, which facilitates rotation and restricts displacement in the horizontal direction at the same time.

[0017] Preferably, the positioning disc is in a stepped shape, that is, concentric circles with decreasing diameters from top to bottom.

[0018] Due to the stepped shape of the positioning disc, one layer of steps can hold parts of one size, and at least one layer of steps can hold at least one size of parts. For example, the positioning disc can be set with four different-sized stepped positioning stop mouths to meet the positioning requirements of more than 10 parts of 4 types.

[0019] Preferably, the pressing device includes a rotary pressing oil cylinder, an extending arm, and a pressing head. One end of the rotary pressing oil cylinder is fixed on the lining plate, and the swinging end is connected to one end of the extending arm. The extending arms of the two pressing devices on both sides are horizontally arranged, and the other end of the extending arm is detachably connected to a vertically arranged pressing head.

[0020] The extending arm can have different lengths to adapt to parts in different positions; the rotary pressing oil cylinder can swing 90 degrees and also has a certain stroke in the vertical direction.

[0021] Preferably, at least one positioning hole is provided on the extending arm. The pressing head includes a pressing rod and a ball plunger. A ball plunger is provided at one end of the pressing rod, and the pressing rod is installed in the positioning hole. The ball plunger presses the flange fork blank in the positioning disc; the ball plunger is made of a hard material, and the ball on the ball plunger does not displace radially and can only roll.

[0022] The positioning hole corresponds to the step of the positioning disc. Select the positioning hole at the appropriate position according to needs, then adjust the distance between the ball plunger and the step of the positioning disc. After determination, detachably fix the pressing rod on the extending arm. The contact surface between the ball plunger and the workpiece is small, which is more suitable for the uneven side surface of the flange fork blank. The ball on the ball plunger does not expand, contract, or displace and can only roll.

[0023] Preferably, a strip-shaped positioning groove is provided on the extending arm. The pressing head includes a pressing rod and a ball plunger. A ball plunger is provided at one end of the pressing rod, and the pressing rod is installed in the positioning groove. The ball plunger presses the flange fork blank in the positioning disc; the ball plunger is made of a hard material, and the ball on the ball plunger does not displace radially and can only roll.

[0024] Because there are too many types of parts, it may be difficult to change the position of the positioning hole. Therefore, it is changed to a long strip-shaped positioning groove. The position of the pressing rod in the positioning groove can be determined according to the needs of the parts, and then the pressing rod is detachably fixed in the positioning groove, and the adjustment is more flexible.

[0025] The fixture for machining the positioning bolt holes of the flange fork in this solution further improves the efficiency of clamping the blank workpiece of the flange fork, allowing it to be quickly inserted and removed. The machining efficiency has increased by 40% compared to the previous fixture. It uses self-locking cylinders to clamp from both sides of the lug. The self-locking cylinders cooperate with the positioning blocks to rotate and align the misaligned blank of the flange fork, and then lock it for stable clamping. The positioning disk limits the blank of the flange fork from moving in the horizontal direction, and the pressing device limits the blank of the flange fork from moving in the vertical direction. The self-locking cylinders align it, thus ensuring that the blank of the flange fork is quickly placed in an accurately positioned place, and the machining accuracy can be comparable to the international advanced level. Moreover, the fixture for machining the positioning bolt holes of the flange fork can be applied to the machining of different types and multiple sizes of flange forks. By selecting a positioning disk of the appropriate size and replacing the corresponding extension arm or replacement part as needed, it is possible to quickly and accurately clamp the blank of flange forks of multiple sizes, and this advantage is not possessed by imported fixtures. Description of the Drawings:

[0026] Appendix Figure 1 is a three-dimensional structural schematic diagram of a fixture for machining the positioning bolt holes of a flange fork in a preferred embodiment. Appendix Figure 2 is a top view of a fixture for machining the positioning bolt holes of a flange fork in a preferred embodiment.

[0027] Appendix Figure 3 is a side view of a fixture for machining the positioning bolt holes of a flange fork in a preferred embodiment.

[0028] Appendix Figure 4 is a side view of a fixture for machining the positioning bolt holes of a flange fork in a preferred embodiment from another angle. In the figure: lining plate 10, positioning disk 20, chip removal hole 30, positioning and supporting device 40, base 41, self-locking cylinder 42, positioning block 43, fixing part 431, replacement part 432, guide rod 44, pressing device 50, rotary pressing cylinder 51, extension arm 52, pressing head 53, pressing rod 531, ball head plunger 532, positioning hole 54, positioning groove 55. Detailed Implementation Manner:

[0029] Example 1:

[0030] Referring to Appendix Figure 1 as shown, a fixture for machining the positioning bolt holes of a flange fork, used for fixing the blank of the flange fork, includes: lining plate 10, positioning disk 20, chip removal hole 30, positioning and supporting device 40, and pressing device 50. The positioning disk 20, the positioning and supporting device 40, and the pressing device 50 are all arranged on the lining plate 10.

[0031] Two pressing devices 50 and two positioning and supporting devices 40 are distributed in a cross shape outside the positioning disc 20. There is a recess in the positioning disc 20 for placing the flange fork blank, which limits the horizontal movement of the flange fork blank; chip removal holes 30 are provided in the positioning disc 20 and penetrate through both the positioning disc 20 and the lining plate 10; the positioning and supporting devices 40 clamp the lugs of the flange fork blank from both sides; the pressing devices 50 press the flange fork blank in the positioning disc 20, limiting the vertical movement of the flange fork blank.

[0032] Specifically, the positioning disc 20 is fixed in the middle of the upper surface of the lining plate 10. The two positioning and supporting devices 40 are respectively arranged on opposite sides of the positioning disc 20, and the two pressing devices 50 are respectively arranged on opposite sides of the positioning disc 20. The straight lines where the two positioning and supporting devices 40 are located are perpendicular to the straight lines where the two pressing devices 50 are located. The two pressing devices 50 and the two positioning and supporting devices 40 are distributed in a cross shape outside the positioning disc 20, that is, the two pressing devices 50 are respectively arranged at the 12 o'clock and 6 o'clock directions of the positioning disc 20, and the two positioning and supporting devices 40 are respectively arranged at the 3 o'clock and 9 o'clock directions of the positioning disc 20. The cross intersection of the straight lines where the two pressing devices 50 are located and the straight lines where the two positioning and supporting devices 40 are located coincides with the geometric center of the positioning disc 20. The straight line where these two points are located is perpendicular to the lining plate 10. The geometric center of the positioning disc 20 and the center of gravity of the workpiece are on the same straight line. The pressing devices 50 and the positioning and supporting devices 40 relatively balance the positioning of the workpiece in the positioning disc 20.

[0033] There is a circular recess in the positioning disc 20 for placing the flange fork blank, and the positioning disc 20 limits the horizontal movement of the flange fork blank workpiece.

[0034] Four bolt holes need to be drilled on the flange fork blank workpiece. Therefore, four chip removal holes 30 are provided in the positioning disc 20. The chip removal holes 30 are the passages for the drilling tool to contact the flange fork blank workpiece. The chip removal holes 30 are vertically arranged and penetrate through both the positioning disc 20 and the lining plate 10, that is, the penetration direction of the chip removal holes 30 is perpendicular to the lining plate 10.

[0035] Refer to the appendix Figure 3 As shown, the positioning and supporting device 40 includes a base 41, a self-locking oil cylinder 42, a guide rod 44 and a positioning block 43. The base 41 is fixed on the lining plate 10. Self-locking oil cylinders 42 protrude from the opposite surfaces of the two bases 41. The two self-locking oil cylinders 42 move relatively, and positioning blocks 43 are arranged at the opposite tops of the two self-locking oil cylinders 42. Guide rods 44 are respectively arranged on both sides of the self-locking oil cylinder 42. The two guide rods 44 are parallel to the self-locking oil cylinder 42. One end of the guide rod 44 is slidably connected to the base 41, and the other end is fixedly connected to the positioning block 43. The two positioning blocks 43 clamp the lugs of the flange fork blank from both sides. The positioning block 43 is made of a hard material; and the surface of the positioning block 43 in contact with the lugs of the flange fork blank is a smooth surface.

[0036] Refer to the attached Figure 4 As shown, the pressing device 50 includes a rotary pressing oil cylinder 51, an extending arm 52, and a pressing head 53. One end of the rotary pressing oil cylinder 51 is fixed on the lining plate 10, and the swinging end is connected to one end of the extending arm 52. The extending arms 52 of the two pressing devices 50 are horizontally arranged, and the other end of the extending arm 52 is detachably connected to a vertically arranged pressing head 53. The pressing device 50 presses the flange fork blank in the positioning disk 20 to limit the vertical movement of the flange fork blank. Specifically, the pressing head 53 includes a pressing rod 531 and a ball plunger 532. A ball plunger 532 is arranged at one end of the pressing rod 531. The pressing rod 531 is detachably installed on the extending arm 52, and the ball plunger 532 presses the flange fork blank in the positioning disk 20; the ball plunger 532 is made of a hard material, and the ball on the ball plunger 532 does not displace radially and can only roll.

[0037] During specific operation, the lining plate 10 is fixed on the processing surface, and the positioning disk 20 on the lining plate 10 is in the middle. In the initial working position, the two positioning and supporting devices 40 are symmetrically arranged on the opposite sides of the positioning disk 20, and the two opposite positioning blocks 43 are located outside the positioning disk 20. The two pressing devices 50 are symmetrically arranged on the opposite sides, and the rotary pressing oil cylinders 51 swing towards both sides. The extending arms 52 on both sides are parallel to each other, and the pressing heads 53 are located outside the positioning disk 20.

[0038] The worker places the flange fork blank in the depression of the positioning disk 20 with the lugs close to the positioning and supporting device 40. The positioning disk 20 limits the horizontal movement of the flange fork blank. The positioning and supporting device 40 starts to work first. The self-locking oil cylinder 42 drives the positioning block 43 to synchronously approach the flange fork blank from both sides along the extending direction of the guide rod 44. There is a certain elasticity during the movement of the self-locking oil cylinder 42 and it is not locked. The positioning block 43 first touches a point on the lug of the flange fork blank. The smooth positioning block 43 drives the angled flange fork blank workpiece to rotate. The two self-locking oil cylinders 42 continue to apply pressure, so that the angled flange fork blank workpiece rotates until the positioning block 43 is in full and tight contact with the lug of the flange fork blank, that is, it rotates to the correct position, that is, the symmetry axis of the lug coincides with the symmetry axes of the two positioning and supporting devices 40. When the rotation ends and the oil pressure is stable, the self-locking oil cylinder 42 locks, and the oil circuit maintains the oil supply state until the drilling process ends.

[0039] After the self-locking oil cylinder 42 locks, the pressing device 50 starts to work. The rotary pressing oil cylinder 51 of the pressing device 50 first swings 90 degrees, so that the extending arms 52 on both sides are opposite and in a straight line, and then shortens downward, so that the ball plunger 532 presses the flange fork blank in the positioning disk 20, and then the two rotary pressing oil cylinders 51 supply oil and lock.

[0040] In this way, the flange fork blank is accurately fixed. The drill bit extends from the chip removal hole 30 to contact the flange fork blank for drilling work, and the part processing begins.

[0041] After the machining is completed, the rotating pressing oil cylinder 51 supplies oil to loosen and reverse by 90 degrees. At the same time, the self-locking oil cylinder 42 discharges oil and shortens towards both sides. After avoiding the workpiece, the machined flange fork blank is taken out to complete the machining. The taking-out and putting-in are convenient and fast, the positioning is accurate and rapid, and the working efficiency is greatly improved.

[0042] Embodiment 2:

[0043] Refer to the appendix Figure 1 As shown, a fixture for machining the positioning bolt holes of a flange fork, which is used to fix the flange fork blank, includes: a lining plate 10, a positioning disk 20, a chip removal hole 30, a positioning support device 40, and a pressing device 50. Two pressing devices 50 and two positioning support devices 40 are distributed in a cross shape outside the positioning disk 20. There is a recess in the positioning disk 20 for placing the flange fork blank, that is, it limits the flange fork blank from moving horizontally; a chip removal hole 30 that penetrates both the positioning disk 20 and the lining plate 10 is provided in the positioning disk 20; the positioning support device 40 clamps the lugs of the flange fork blank from both sides; the pressing device 50 presses the flange fork blank in the positioning disk 20 to limit the flange fork blank from moving vertically.

[0044] The positioning disk 20 is fixed in the middle of the upper surface of the lining plate 10. Two positioning support devices 40 are respectively arranged on opposite sides of the positioning disk 20, and two pressing devices 50 are respectively arranged on opposite sides of the positioning disk 20. The straight line where the two positioning support devices 40 are located is perpendicular to the straight line where the two pressing devices 50 are located. The two pressing devices 50 and the two positioning support devices 40 are distributed in a cross shape outside the positioning disk 20, that is, the two pressing devices 50 are respectively arranged at the 12 o'clock and 6 o'clock positions of the positioning disk 20, and the two positioning support devices 40 are respectively arranged at the 3 o'clock and 9 o'clock positions of the positioning disk 20. The cross intersection of the straight line where the two pressing devices 50 are located and the straight line where the two positioning support devices 40 are located and the geometric center of the positioning disk 20, the straight line where these two points are located is perpendicular to the lining plate 10.

[0045] Refer to the appendix Figure 2 As shown, there is at least one circular recess in the positioning disk 20 for placing the flange fork blank, that is, the positioning disk 20 is in a stepped shape, which is a concentric circle with a decreasing diameter from top to bottom. The positioning disk 20 limits the flange fork blank workpiece from moving horizontally.

[0046] Four bolt holes need to be drilled on the flange fork blank workpiece. Therefore, four chip removal holes 30 are provided in the positioning disk 20. The chip removal hole is the passage for the drilling tool to contact the flange fork blank workpiece. The chip removal holes 30 penetrate the positioning disk 20 and the lining plate 10 vertically at the same time, that is, the penetration direction of the chip removal holes 30 is perpendicular to the lining plate 10. The chip removal holes 30 cut off the stepped concentric circles in the positioning disk 20, but do not affect the normal horizontal placement of the flange fork blank workpiece in the positioning disk 20.

[0047] The stepped positioning plate 20 can accommodate the placement of more than 10 specifications of workpieces of 4 existing types, and the chip removal holes 30 are also relatively large, enabling drilling operations on any placed workpiece.

[0048] Refer to the appendix Figure 3 As shown, the positioning and supporting device 40 includes a base 41, a self-locking oil cylinder 42, a guide rod 44, and a positioning block 43. The base 41 is fixed on the lining plate 10. Self-locking oil cylinders 42 protrude from the opposite faces of the two bases 41. The two self-locking oil cylinders 42 move relative to each other, and positioning blocks 43 are provided at the opposite ends of the two self-locking oil cylinders 42. Guide rods 44 are respectively arranged on both sides of the self-locking oil cylinder 42. The two guide rods 44 are parallel to the self-locking oil cylinder 42. One end of the guide rod 44 is slidably connected to the base 41, and the other end is fixedly connected to the positioning block 43. The two positioning blocks 43 clamp the lugs of the flange fork blank from both sides. The positioning block 43 is made of a hard material.

[0049] Specifically, the positioning block 43 includes a fixing part 431 and a replacement part 432. One end of the fixing part 431 is fixedly connected to the self-locking oil cylinder 42, and the other end is detachably connected to the replacement part 432. The surface of the replacement part 432 in contact with the lug of the flange fork blank is a smooth surface. The replacement part 432 and the fixing part 431 can be connected by a dovetail block and a dovetail groove, and fixed with bolts.

[0050] Refer to the appendix Figure 4 As shown, the pressing device 50 includes a rotary pressing oil cylinder 51, an extending arm 52, and a pressing head 53. One end of the rotary pressing oil cylinder 51 is fixed on the lining plate 10, and the swinging end is connected to one end of the extending arm 52. The extending arms 52 of the two pressing devices 50 are horizontally arranged. The other end of the extending arm 52 is detachably connected to a vertically arranged pressing head 53. The pressing device 50 presses the flange fork blank in the positioning plate 20 to limit the non-movement of the flange fork blank in the vertical direction.

[0051] For workpieces of different types, extending arms 52 of different lengths can be replaced. Two specifications of extending arms 52 can meet the requirements of the fixture for placing more than 10 specifications of workpieces of 4 types.

[0052] Specifically, as shown in the appendix Figure 2 shown, at least one positioning hole 54 is provided on the extending arm 52. The pressing head 53 includes a pressing rod 531 and a ball plunger 532. A ball plunger 532 is provided at one end of the pressing rod 531. The pressing rod 531 is installed in the positioning hole 54, and the ball plunger 532 presses the flange fork blank in the positioning plate 20; the ball plunger 532 is made of a hard material, and the ball on the ball plunger 532 does not displace radially and can only roll.

[0053] Alternatively, a strip-shaped positioning groove 55 is provided on the extending arm 52. The indenter 53 includes a pressure rod 531 and a ball plunger 532. A ball plunger 532 is provided at one end of the pressure rod 531. The pressure rod 531 is installed in the positioning groove 55, and the ball plunger 532 presses against the flange fork blank in the positioning disk 20. The ball plunger 532 is made of a hard material, and the ball on the ball plunger 532 does not displace radially and can only roll.

[0054] During specific operation, the working process is the same as that of Embodiment 1, but Embodiment 2 can meet the processing of more than 10 specifications of workpieces of 4 existing types. By selecting a step with a suitable size of the positioning disk 20, replacing the replacement part 432 with different thicknesses, selecting extending arms 52 with different lengths, and adjusting the distance between the ball plunger 532 and the flange fork blank, the processing of flange fork blanks of different types and multiple sizes can be adapted, so as to realize the rapid and accurate clamping of flange fork blanks of multiple sizes, and expand the application range.

Claims

1. A flange fork positioning bolt hole machining fixture for fixing a flange fork blank, characterized in that, Including: Lining plate, positioning disc, chip removal hole, positioning support device and pressing device; The positioning disc is fixed in the middle of the upper surface of the lining plate, and the positioning support device and the positioning support device are both arranged on the upper surface of the lining plate; The two positioning support devices are respectively arranged on the opposite sides of the positioning disc, the two pressing devices are respectively arranged on the opposite sides of the positioning disc, the straight line where the two positioning support devices are located is perpendicular to the straight line where the two pressing devices are located, and the straight line where the intersection point and the geometric center of the positioning disc are located is perpendicular to the lining plate; There is a depression in the positioning disc for placing the flange fork blank, that is, to limit the horizontal movement of the flange fork blank; A chip removal hole that penetrates both the positioning disc and the lining plate is arranged in the positioning disc, and the chip removal hole penetrates vertically, that is, the penetration direction of the chip removal hole is perpendicular to the lining plate; The positioning support device includes a base, a self-locking oil cylinder and a positioning block. The base is fixed on the lining plate. Self-locking oil cylinders protrude from the opposite surfaces of the two bases. The two self-locking oil cylinders move relative to each other, and positioning blocks are arranged at the opposite ends of the two self-locking oil cylinders. The two positioning blocks clamp the ear of the flange fork blank from both sides; The pressing device presses the flange fork blank on the positioning disc to limit the vertical movement of the flange fork blank.

2. The flange fork positioning bolt hole machining fixture according to claim 1, characterized in that The positioning block includes a fixing part and a replacement part. One end of the fixing part is fixedly connected to the self-locking oil cylinder, and the other end is detachably connected to the replacement part.

3. The flange fork positioning bolt hole machining fixture according to claim 2, characterized in that The replacement part and the fixing part are connected by the way of dovetail block and dovetail groove.

4. The flange fork positioning bolt hole machining fixture according to claim 1, characterized in that The positioning block is made of hard material; and the surface of the positioning block in contact with the ear of the flange fork blank is a smooth surface.

5. The flange fork positioning bolt hole machining fixture according to claim 1, characterized in that The positioning support device further includes guide rods. Guide rods are respectively arranged on both sides of the self-locking oil cylinder. The two guide rods are parallel to the self-locking oil cylinder. One end of the guide rod is slidably connected to the base, and the other end is fixedly connected to the positioning block.

6. The flange fork positioning bolt hole machining fixture according to claim 1, characterized in that, The depression in the positioning disc is circular.

7. The flange fork positioning bolt hole machining fixture according to claim 6, characterized in that, The positioning disc is in a stepped shape, that is, concentric circles with decreasing diameters from top to bottom.

8. The flange fork positioning bolt hole machining fixture according to claim 1, characterized in that, The pressing device includes a rotary pressing oil cylinder, a protruding arm and a pressing head. One end of the rotary pressing oil cylinder is fixed on the lining plate, and the swinging end is connected to one end of the protruding arm. The protruding arms of the two pressing devices on both sides are horizontally arranged, and the other end of the protruding arm is detachably connected to a vertically arranged pressing head.

9. The flange fork positioning bolt hole machining fixture according to claim 8, characterized in that, At least one positioning hole is arranged on the protruding arm. The pressing head includes a pressing rod and a ball plunger. A ball plunger is arranged at one end of the pressing rod. The pressing rod is installed in the positioning hole, and the ball plunger presses the flange fork blank in the positioning disc; The ball plunger is made of hard material, and the ball on the ball plunger does not displace radially and can only roll.

10. The flange fork positioning bolt hole machining fixture according to claim 8, wherein A strip-shaped positioning groove is arranged on the protruding arm. The pressing head includes a pressing rod and a ball plunger. A ball plunger is arranged at one end of the pressing rod. The pressing rod is installed in the positioning groove, and the ball plunger presses the flange fork blank in the positioning disc; The ball plunger is made of hard material, and the ball on the ball plunger does not displace radially and can only roll.

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