A hub bearing drilling and tapping clamp and processing method

Abstract

The present application relates to the technical field of hub bearing machining, and particularly discloses a hub bearing drilling and tapping clamp, which comprises a plurality of clamping blocks capable of approaching the center of the hub bearing, the clamping blocks being used for clamping on the outer periphery of the flange of the hub bearing, further comprising a support column used for supporting the flange of the hub bearing, the contact position of the support column and the flange avoiding the position needing to be holed on the flange; and further comprising a positioning member used for limiting the circumferential rotation of the hub bearing. A machining method for the drilling and tapping of a hub bearing, which needs the hub bearing drilling and tapping clamp to clamp the workpiece, the positioning member being capable of pressing the non-machining position on the upper surface of the flange, and further comprising the following machining steps: S1, machining the hole position; S2, adopting the mode of inserting a hooking tool into the hole position from top to bottom to chamfer the bottom end of the hole. The present application is used to solve the problems that the machining precision is difficult to guarantee in the machining of the drilling and tapping of the flange of the current hub bearing and the surface of the cylindrical segment of the inner ring of the hub bearing is easily clamped and damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hub bearing machining, in particular to a hub bearing drilling and tapping clamp and a machining method. BACKGROUND

[0002] The main function of the hub bearing is to bear the weight, which is an indispensable part of the automobile. The hub bearing includes an inner ring, a small inner ring, an outer ring, rolling elements and a retainer. Two rows of raceways are arranged on the outer ring, and one row of raceways is arranged on the inner ring and the small inner ring. The rolling elements are located in the raceways under the action of the retainer and move in the raceways when the inner ring and the outer ring of the hub bearing rotate relative to each other.

[0003] When the hub bearing is used, it needs to be connected with the rim, brake disc and steering knuckle. Therefore, holes need to be drilled and even tapped on the inner ring flange and / or the outer ring flange of the hub bearing. In order to ensure the machining accuracy of drilling and tapping, the inner ring flange or the outer ring flange of the hub bearing needs to be clamped by a clamp during machining. For example, the clamp for hub bearing machining disclosed in patent No. CN210997688U is used to clamp the inner ring of the hub bearing to facilitate hole machining or polishing of the hub bearing. When clamping, the multiple clamping blocks on the clamp are close to each other to tightly surround and clamp the cylindrical section of the inner ring of the hub bearing.

[0004] However, the existing clamping method only clamps the inner ring of the hub bearing by the circumferential clamping blocks. However, there are many hole positions to be machined on the flange of the hub bearing, and the specifications are not only one kind. After machining the holes of the same specification, the tool needs to be changed for machining the holes of the next specification. However, each hole is eccentrically arranged on the inner ring of the hub bearing. During hole machining, the stress on the inner ring of the hub bearing is uneven. Only the circumferential clamping of the multiple clamping blocks on the cylindrical section of the inner ring of the hub bearing cannot guarantee the machining accuracy of the hole positions.

[0005] In order to ensure the machining accuracy during drilling and tapping, the clamping force of the clamping blocks on the cylindrical section of the inner ring of the hub bearing needs to be increased. However, the increase of the clamping force also increases the probability of scratching the surface of the cylindrical section.

[0006] In addition, under the clamping of the existing clamp, the waste generated during machining of the hole positions of the inner ring of the hub bearing is easily accumulated on the clamping blocks, increasing the difficulty of cleaning the waste. SUMMARY

[0007] The present application aims to provide a hub bearing drilling and tapping clamp to solve the problems of difficult guarantee of machining accuracy and easy scratching of the surface of the cylindrical section of the inner ring of the hub bearing during drilling and tapping of the flange of the hub bearing.

[0008] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0009] The hub bearing drilling and tapping clamp comprises a plurality of clamping blocks capable of approaching the center of the hub bearing, the clamping blocks being used for clamping on the outer periphery of the flange of the hub bearing, a support column for supporting the flange of the hub bearing, the contact position of the support column and the flange avoiding the position of the hole to be opened on the flange, and a positioning member for limiting the circumferential rotation of the hub bearing.

[0010] The principle and advantages of the scheme are as follows:

[0011] 1. When the scheme is adopted, the clamping blocks clamping the cylinder segment of the hub bearing are changed into clamping the outer periphery of the flange. Compared with clamping the cylinder segment, the contact area during clamping is greatly increased because the outer periphery of the flange is the largest outer diameter position on the hub bearing. This not only avoids damaging the cylinder segment of the hub bearing, but also greatly increases the contact area during clamping, thereby ensuring greater clamping force when the hub bearing is machined. In addition, the flange of the hub bearing is bottom-supported by the support column and circumferentially limited by the positioning member. Even if the drilling and tapping hole position on the flange of the hub bearing is eccentric machining, the machining precision of the hole position on the flange of the hub bearing can be ensured under the conditions of greater clamping force, bottom support and circumferential limitation.

[0012] 2. The clamping blocks of the scheme are clamped on the outer periphery of the flange. Compared with the case of clamping on the cylinder segment, the outer surface of the cylinder segment of the hub bearing is the raceway surface and the mating surface with the small inner ring. Therefore, if the outer surface is damaged, it will greatly affect the performance of the hub bearing. The scheme clamps on the outer periphery of the flange with low requirements for the outer surface quality, thereby ensuring that the outer periphery of the cylinder segment with high surface precision requirements is not affected by machining, and the possibility of damage to the cylinder segment is avoided. In addition, when clamped on the outer periphery of the flange, the contact area during clamping is larger, the clamping force is greater and more stable, and the probability of damage to the outer periphery of the flange by the clamping block is also reduced.

[0013] 3. The scheme avoids the contact position of the support column and the flange from the hole opening position, thereby ensuring that the machining of the hole position on the flange is not affected by the support column, and ensuring the machining efficiency on the basis of ensuring high precision.

[0014] Preferably, as an improvement, the support column is hollow inside and has through holes at the top and bottom, the hole to be opened on the flange is located in the hollow space of the support column, and the bottom through hole of the support column is communicated with a chip removal channel.

[0015] Beneficial effects: The scheme enables the waste chips generated during machining to directly fall from the top through hole of the support column into the hollow space of the support column, and then enter the chip removal channel from the bottom through hole of the hollow space, and finally be discharged from the chip removal channel, thereby avoiding the accumulation of waste chips on the clamp.

[0016] Preferably, as an improvement, it further comprises a ring-shaped seat and a cylinder claw located in the ring-shaped seat, the cylinder claw comprises a connecting ring and a plurality of elastic clamping claws evenly distributed on the connecting ring, each elastic clamping claw is provided with a clamping block, the elastic clamping claw is matched with the ring-shaped seat through a slope, and the elastic clamping claw can move along the slope when the connecting ring moves vertically.

[0017] Beneficial effects: the scheme can make the vertical movement of the cylinder claw, i.e. the movement of the elastic clamping claw on the slope, and then force the clamping block to move away from or close to the flange of the hub bearing, so as to loosen or clamp the flange of the hub bearing.

[0018] Preferably, as an improvement, it further comprises a chip removal cylinder located below the supporting column, the chip removal cylinder forms a chip removal channel, the chip removal cylinder can move vertically, and the chip removal cylinder is fixedly connected with the connecting ring.

[0019] Beneficial effects: the vertically movable chip removal cylinder can not only drive the vertical movement of the connecting ring, i.e. control the clamping or not of the clamping block, but also form a chip removal channel, facilitate the discharge of waste chips, and facilitate the falling of the waste chips hung on the inner wall of the chip removal cylinder during the vertical movement.

[0020] Preferably, as an improvement, it further comprises a ring-shaped positioning seat, the chip removal cylinder penetrates through the ring-shaped positioning seat, the ring-shaped positioning seat is provided with a ring-shaped groove surrounding the chip removal cylinder, a closed cavity is formed between the ring-shaped groove and the chip removal cylinder, a piston is fixedly connected to the outer periphery of the chip removal cylinder, the piston is vertically and slidingly connected to the ring-shaped groove and separates the cavity into two independent chambers, and each chamber is communicated with a flow channel.

[0021] Beneficial effects: the scheme controls the pressure in the upper and lower chambers through the flow channels of the upper and lower chambers respectively, and then controls the vertical lifting of the chip removal cylinder with the piston, which not only guarantees the clamping or not of the clamping block through lifting control, but also meets the chip removal demand of the chip removal cylinder, and does not increase the space of the whole clamp, so that the structure of the clamp is compact and the floor area is small, which is beneficial to installing more drilling and tapping clamps on the workbench of the same size numerical control machine tool, improving the number of workpieces processed at a time, and then improving the machining efficiency and the consistency of workpiece machining quality.

[0022] Preferably, as an improvement, the chip removal cylinder is fixedly connected with a pull plate, the pull plate and the connecting ring are located on the upper and lower sides of the ring-shaped positioning seat, a connecting rod is fixedly connected between the pull plate and the connecting ring, and the connecting rod is vertically and slidingly connected to the ring-shaped positioning seat.

[0023] Beneficial effects: the scheme makes the connecting structure simple, and the ring-shaped positioning seat guides the vertical movement of the connecting rod, so that the vertical movement of the cylinder claw is more stable, and the service life of the cylinder claw is prolonged.

[0024] Preferably, as an improvement, the annular positioning seat comprises an upper cylindrical section and a lower cylindrical section, the outer diameter of the lower cylindrical section is larger than that of the upper cylindrical section, the lower cylindrical section is partially embedded in the annular seat, an annular gap between the annular seat and the upper cylindrical section is used to accommodate the connecting ring, the annular seat is provided with weight-reducing grooves with openings facing upward, and the weight-reducing grooves and the clamping blocks are distributed in a staggered manner in the circumferential direction of the annular seat.

[0025] Beneficial effects: the upper and lower cylindrical sections of the annular positioning seat are arranged, the annular seat shields the lower cylindrical section of the annular positioning seat, thereby avoiding the direct falling of waste into the annular gap between the annular seat and the lower cylindrical section of the annular positioning seat, and playing a dustproof and protective role on the annular positioning seat; the weight-reducing grooves provided on the annular seat not only reduce the weight of the annular seat, but also enable the waste that does not fall from the machining hole in time to fall onto the weight-reducing grooves from the empty areas on both sides of the clamping blocks, thereby avoiding the accumulation of waste on the clamping blocks; in addition, the lifting action of the connecting ring is also conducive to pushing out the waste accumulated on the connecting ring and the weight-reducing grooves.

[0026] Preferably, as an improvement, the through hole at the bottom of the supporting column is a tapered hole, and the small-size end of the tapered hole is close to the chip removal channel.

[0027] Beneficial effects: this scheme enables the waste to fall from the hollow space of the supporting column to the chip removal cylinder through the tapered hole in time, facilitates the timely discharge of waste, and at the same time, after supporting columns of different specifications are installed on the annular positioning seat, the waste can also be dropped into the chip removal cylinder through the tapered hole in time.

[0028] The application also provides a machining method for drilling and tapping of a hub bearing, and the hub bearing drilling and tapping clamp needs to be used to clamp a workpiece, the positioning member can be pressed against a non-machining position on the upper surface of the flange, and the machining method comprises the following steps:

[0029] S1, machining a hole position;

[0030] S2, chamfering the bottom end of the hole by inserting a hooking cutter into the hole position from top to bottom.

[0031] Preferably, as an improvement, a plurality of hub bearing drilling and tapping clamps are installed on the same workbench.

[0032] Beneficial effects of the application are as follows:

[0033] 1. During processing, the present invention uses a clamping block to hold the flange of the wheel hub bearing, a support column to support the flange from the bottom, and a positioning element to press and restrict the circumferential rotation of the flange from above. Furthermore, the contact positions of the support column and positioning element with the flange avoid the holes that need to be processed. Therefore, with all directions of the wheel hub bearing restricted, the hook cutter can extend below the bottom of the hole. This allows for chamfering of the bottom of the hole without needing to flip the wheel hub bearing flange, improving processing efficiency. It also avoids the need for repositioning and re-aligning the workpiece after processing, ensuring the quality of the chamfering.

[0034] 2. Due to the compact design of the wheel hub bearing drilling and tapping fixture, this invention allows multiple fixtures to be installed on a CNC machine tool workbench, facilitating the processing of multiple wheel hub bearings on the fixture. Actual verification shows that the original workbench could only accommodate 2 fixtures. After the design improvement of the wheel hub bearing drilling and tapping fixture in this invention, the number of fixtures that can be placed on the original workbench has reached 6, far exceeding expectations, which greatly improves processing efficiency and significantly increases enterprise production capacity. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural schematic diagram of the wheel hub bearing drilling and tapping fixture according to an embodiment of the present invention.

[0036] Figure 2 for Figure 1 Top view.

[0037] Figure 3 for Figure 2 AA rotated section view in the image.

[0038] Figure 4 for Figure 2 BB rotated section view.

[0039] Figure 5 This is a partial exploded view of the wheel hub bearing drilling and tapping fixture according to an embodiment of the present invention.

[0040] Figure 6 This is a top sectional view of the positioning component in the wheel hub bearing drilling and tapping fixture according to an embodiment of the present invention.

[0041] Figure 7 This is a three-dimensional structural diagram of an embodiment of the present invention after six wheel hub bearing drilling and tapping fixtures are installed on the same workbench.

[0042] Figure 8 for Figure 7 Top view.

[0043] Figure 9 for Figure 7 Front sectional view.

[0044] Figure 10 This is a schematic diagram of the processing method of this invention when chamfering the bottom end of the hole in the inner ring of a wheel hub bearing. Detailed Implementation

[0045] The following detailed description illustrates the specific implementation method:

[0046] The reference numerals in the accompanying drawings include: worktable 100, main fixture 101, main channel one 1011, main channel two 1012, worktable body 102, rib plate 103, chip removal guide plate 104, wheel hub bearing inner ring 10, annular seat 1, weight reduction groove 11, cylinder claw 2, elastic gripper 21, clamping block 211, connecting ring 22, limiting component 221, connecting rod 23, support column 3, annular positioning seat 4, end cap 41, mounting hole 42, flow channel one 43, flow channel two 44, upper chamber 401, lower chamber 402, pull plate 5, chip removal cylinder 6, piston 61, annular sleeve plate 7, positioning component 8, mounting seat 81, spring 82, baffle 83, hook cutter 9, extension rod 91, and wheel hub bearing drilling and tapping fixture 200.

[0047] The basic implementation examples are as follows: Figures 1 to 10 As shown, a machining method for drilling and tapping wheel hub bearings requires drilling, tapping, and chamfering the flange of the inner ring 10 of the wheel hub bearing using a CNC machine tool. A wheel hub bearing drilling and tapping fixture 200 is needed. Specifically, multiple wheel hub bearing drilling and tapping fixtures 200 are installed on the worktable 100 of the CNC machine tool. Each wheel hub bearing drilling and tapping fixture 200 is used to fix and clamp one inner ring 10 of the wheel hub bearing. The specific structure of the wheel hub bearing drilling and tapping fixture 200 is as follows:

[0048] Combination Figures 1 to 6 As shown, the wheel hub bearing drilling and tapping fixture 200 includes an annular seat 1, a claw 2, a support column 3, an annular positioning seat 4, and a positioning element 8. Both the annular seat 1 and the annular positioning seat 4 are fixed to the worktable 100 with screws. The annular positioning seat 4 cooperates with the claw 2 to clamp the outer circumference of the flange of the inner ring 10 of the wheel hub bearing. The support column 3 supports the inner ring 10 of the wheel hub bearing from the bottom of the flange. The annular positioning seat 4 is used to fix the support column 3 in place, and the positioning element 8 is used to circumferentially limit and press the flange of the inner ring 10 of the wheel hub bearing from above.

[0049] The cylinder claw 2 is located in the annular seat 1, the cylinder claw 2 comprises an integral connecting ring 22 and a plurality of elastic clamping claws 21 which are evenly distributed on the connecting ring 22 in the circumferential direction, each elastic clamping claw 21 comprises a thin-walled section which is integrally formed with the connecting ring 22 and a clamping head which is located at the free end of the thin-walled section, and a clamping block 211 is mounted on the clamping head of each elastic clamping claw 21 by means of a screw, the elastic clamping claw 21 is matched with the annular seat 1 through a slope, and the elastic clamping claw 21 can move along the slope when the connecting ring 22 moves vertically.

[0050] The annular positioning seat 4 comprises an upper cylindrical section and a lower cylindrical section which is integrally formed, and the outer diameter of the lower cylindrical section is greater than that of the upper cylindrical section, the lower cylindrical section is partially embedded in the annular seat 1, and an annular gap between the annular seat 1 and the upper cylindrical section is used to accommodate the connecting ring 22, the annular seat 1 is provided with a weight-reducing groove 11 which is open upward, and the weight-reducing groove 11 and the clamping block 211 are distributed in the circumferential direction of the annular seat 1 in a staggered manner.

[0051] The connecting ring 22 of the cylinder claw 2 is fixed with a downward connecting rod 23 at the bottom, the connecting rod 23 is vertically and slidingly connected to the annular positioning seat 4, in the embodiment, the connecting rod 23 penetrates through the bottom end of the annular positioning seat 4 and is fixedly connected with a pull plate 5, the vertical movement of the pull plate 5 drives the connecting rod 23 to move vertically and stably along the annular positioning seat 4, and then drives the connecting ring 22 to move vertically, and in the vertical movement process, the elastic clamping claw 21 moves along the slope of the annular seat 1, so as to realize the mutual approach or mutual separation of the clamping blocks 211 on the plurality of elastic clamping claws 21.

[0052] The support column 3 is fixed on the upper cylindrical section of the annular positioning seat 4 by means of a screw, a plurality of rows of mounting holes 42 are processed on the upper cylindrical section of the annular positioning seat 4, each row of mounting holes 42 is arranged along the radial direction of the hub bearing inner ring 10, and the mounting holes 42 located on different circumferences can correspondingly mount different support columns 3. The contact position of the support column 3 with the flange avoids the position which needs to be holed on the flange, specifically, the support column 3 is hollow inside and the top and bottom are both through holes, the hole position which needs to be holed on the flange is located in the hollow space of the support column 3, the bottom through hole of the support column 3 is a tapered hole, and the hole diameter of the tapered hole is smaller when it is farther away from the hub bearing inner ring 10. The bottom through hole of the support column 3 is communicated with a chip removal channel.

[0053] The middle part of the annular positioning seat 4 is vertically and slidingly connected with a chip removal cylinder 6, the bottom of the chip removal cylinder 6 penetrates through the annular positioning seat 4, the top of the chip removal cylinder 6 is communicated with the bottom through hole of the support column 3, and an annular sleeve plate 7 is arranged between the chip removal cylinder 6 and the support column 3, the annular sleeve plate 7 is fixed on the annular positioning seat 4 by means of a screw, a material guiding slope is processed on the chip inlet end of the annular sleeve plate 7, the annular sleeve plate 7 covers the chip removal cylinder 6, the annular sleeve plate 7 shields the chip removal cylinder 6, and simultaneously facilitates the rapid falling of waste chips into the chip removal cylinder 6, and the annular sleeve plate 7 and the chip removal cylinder 6 form the chip removal channel at the bottom of the support column 3.

[0054] The pull plate 5 is fixed on the outer periphery of a section at the bottom of the chip removal cylinder 6, so that the pull plate 5 moves synchronously with the chip removal cylinder 6.

[0055] The annular positioning seat 4 is provided with an annular groove surrounding the chip removal cylinder 6, and the annular groove and the chip removal cylinder 6 form a closed cavity. The outer periphery of the middle part of the chip removal cylinder 6 is fixed with a piston 61, the piston 61 is vertically slidably connected to the annular groove and divides the cavity into two independent chambers. The annular positioning seat 4 is provided with flow passage one 43 and flow passage two 44. The flow passage one 43 is in communication with the upper chamber 401, and the flow passage two 44 is in communication with the lower chamber 402.

[0056] The workbench 100 is processed with main passage one 1011 and main passage two 1012. Each main passage one 1011 and main passage two 1012 is communicated with a plurality of branch flow passages. Each branch flow passage on the main passage one 1011 is in communication with the flow passage one 43 of the positioning disc on one of the hub bearing drilling and tapping clamps 200. Each branch flow passage on the main passage two 1012 is in communication with the flow passage two 44 of the positioning disc on one of the hub bearing drilling and tapping clamps 200.

[0057] The main passage one 1011 and the main passage two 1012 on the workbench 100 are used to send hydraulic oil to each hub bearing drilling and tapping clamp 200 and return the oil in the hub bearing drilling and tapping clamp 200. It is convenient to control the synchronous movement of the chip removal cylinder 6 with the piston 61 on all clamps by sending oil or returning oil through the main passage one 1011 and the main passage two 1012, which reduces the control cost and makes the structure of all clamps on the whole workbench 100 more compact.

[0058] In this embodiment, in order to ensure the sealing of the cavity, sealing rings are installed above and below the annular groove. In order to ensure the formation of the annular groove and the easy installation of the chip removal cylinder 6 with the piston 61, a detachable end cover 41 is installed at the bottom end of the annular positioning seat 4. The end cover 41 is sleeved outside the chip removal cylinder 6, and there are sealing rings between the end cover 41 and the annular positioning seat 4 and between the end cover 41 and the chip removal cylinder 6.

[0059] In this embodiment, in order to avoid the stroke of the chip removal cylinder 6 moving downward being too long, resulting in the clamping force of the clamping block 211 on the hub bearing inner ring 10 being too large, a limiting piece 221 is installed on the connecting ring 22. The bottom of the limiting piece 221 protrudes from the bottom surface of the connecting ring 22 and can abut against the upper surface of the annular positioning seat 4. In this embodiment, the limiting piece 221 is a limiting screw.

[0060] The positioning piece 8 is horizontally and slidingly connected to the fixed mounting seat 81, the mounting seat 81 is fixed on the workbench 100, a spring 82 is arranged between the mounting seat 81 and the positioning piece 8, the extension direction of the spring 82 is radially parallel to the wheel hub bearing inner ring 10, the spring 82 is used for pushing the positioning piece 8 towards the wheel hub bearing inner ring 10, specifically, a blind hole is arranged on the positioning piece 8 along the radial direction of the wheel hub bearing inner ring 10, the spring 82 is arranged in the blind hole and extends out of the blind hole, a baffle 83 is fixed on the mounting seat 81 and faces the blind hole, the spring 82 is located between the baffle 83 and the bottom of the blind hole, and the positioning piece 8 is horizontally and slidingly connected to the mounting seat 81, and the sliding direction of the positioning piece 8 is radially parallel to the wheel hub bearing inner ring 10.

[0061] In combination Figures 7 to 9 , the machining method is used for guaranteeing that the waste is timely removed in the machining process, the workbench 100 is optimized and improved, the workbench 100 comprises a clamp main plate 101, a workbench body 102 and a plurality of rib plates 103 arranged between the clamp main plate 101 and the workbench body 102, the annular seat 1 and the annular positioning seat 4 of all the wheel hub bearing drilling and tapping clamps 200 are fixed on the clamp main plate 101, so that the clamp main plate 101 and all the wheel hub bearing drilling and tapping clamps 200 thereon form an integral whole, and the installation and dismounting on the workbench body 102 are facilitated. The rib plates 103 make the clamp main plate 101 and the workbench 100 have a hollow space, a chip removal hole is arranged on the clamp main plate 101 and faces the chip removal cylinder 6, and an inclined chip removal guide plate 104 is arranged below the chip removal hole, the inclined chip removal guide plate 104 extends to the outside of the workbench body 102 at the downward end, so that the waste is removed to the outside of the workbench 100 along the chip removal guide plate 104 after falling from the chip removal cylinder 6.

[0062] The machining method of the wheel hub bearing drilling and tapping, specifically comprising the following steps:

[0063] Firstly, the hydraulic oil is injected into the main passage two 1012, the main passage one 1011 is used for oil return, the hydraulic oil on the main passage two 1012 enters the flow passage two 44 of the annular positioning seat 4 on each clamp through each branch passage, and finally enters the lower cavity 402 of the clamp, so that the lower cavity 402 is filled with oil to promote the upward movement of the chip removal cylinder 6, the chip removal cylinder 6 drives the elastic clamping jaw 21 to move upward through the pull plate 5 and the connecting rod 23, the clamping block 211 fixed on the elastic clamping jaw 21 moves outward under the elastic action, and space is provided for the placement of the wheel hub bearing inner ring 10.

[0064] Secondly, the wheel hub bearing inner ring 10 is placed on the supporting column 3 of each clamp, before placement, the positioning piece 8 is controlled to move away from the center of the clamp, so as to avoid the interference of the positioning piece 8 with the wheel hub bearing inner ring 10.

[0065] Third step, place the hub bearing inner ring 10 to be processed on the support column 3, after the placement, loosen the control of the positioning member 8, so that the positioning member 8 moves radially under the action of the spring 82 and abuts against the protruding position on the flange upper surface of the hub bearing inner ring 10, forming the downward pressing and circumferential limiting of the hub bearing inner ring 10.

[0066] Fourth step, inject hydraulic oil into the main channel one 1011, and use the main channel two 1012 for oil return. The hydraulic oil on the main channel one 1011 enters the flow channel one 43 of the annular positioning seat 4 of each clamp through each branch channel, and finally enters the upper cavity 401 of the clamp, so that the upper cavity 401 is filled with oil to make the chip removal cylinder 6 move downward. The chip removal cylinder 6 moves downward to drive the pull plate 5, the connecting rod 23 and the connecting ring 22 to move downward synchronously. The elastic clamping jaw 21 moves along the inclined surface of the annular seat 1, so that the clamping block 211 approaches the hub bearing inner ring 10 to clamp the outer periphery of the flange of the hub bearing inner ring 10.

[0067] Fifth step, process the holes of the clamped hub bearing inner ring 10. When the hole position is processed, the same specification tool is used to process all hole positions of the same size of all hub bearing inner rings 10 on the workbench 100, and then the tool is replaced to process hole positions of other specifications.

[0068] Sixth step, after the hole position is processed, the hole position that needs to be tapped is tapped, and the hole position that needs to be chamfered is chamfered. During the chamfering process, the chamfering of the bottom end of the hole position is processed by the hook knife 9. Specifically, as shown in Figure 10 , the hook knife 9 is fixed on the lengthened rod 91, the lengthened rod 91 is fixed on the tool rotating output shaft of the numerical control machine tool, the lengthened rod 91 with the hook knife 9 is inserted into the hole from top to bottom, the hook knife 9 at the bottom end of the lengthened rod 91 contacts the bottom end of the hole, and the tool rotating output shaft drives the lengthened rod 91 to rotate and further drives the hook knife 9 to realize the chamfering processing of the bottom end of the hole.

[0069] In the embodiment, by changing the clamping block 211 that clamps the cylinder segment of the hub bearing inner ring 10 to clamp the outer periphery of the flange, both the clamping damage of the cylinder segment of the hub bearing inner ring 10 and the large contact area during clamping are avoided, the clamping force of the hub bearing inner ring 10 during flange processing is ensured to be larger, and the flange of the hub bearing inner ring 10 is supported at the bottom by the support column 3 and limited in the circumferential direction from the top by the positioning member 8, so that even if the hole position on the flange is eccentric processing, the machining precision of the hole position on the flange of the hub bearing can be ensured under the conditions of larger clamping force, bottom support and top circumferential limiting.

[0070] In addition, most of the waste generated during the processing of the embodiment will fall from the processing hole of the flange into the hollow space of the support column 3, and then through the bottom tapered hole of the support column 3, the guide slope of the annular sleeve plate 7, the chip removal cylinder 6, and the chip removal hole. Finally, the waste is discharged from the chip removal guide plate 104 to the outside of the workbench 100. Part of the waste will fall into the space formed by the weight reduction groove 11. Only a small amount of waste stays on the upper surface of the clamping block 211 and the upper surface of the flange of the hub bearing inner ring 10. The timely discharge of the machining waste is achieved, and the probability of waste accumulation on the clamping block 211 or the flange of the hub bearing inner ring 10 is reduced.

[0071] In addition, the positioning disc and the chip removal cylinder 6 are provided in the embodiment, so that the structure of each hub bearing drilling and tapping clamp 200 is very compact on the basis of meeting the stable support and stable clamping of the workpiece and timely discharge of the chips. This is conducive to installing more clamps on the existing workbench 100 of the numerical control machine tool, so as to reduce the number of tool changes and improve the machining efficiency. In the embodiment, only two hub bearing drilling and tapping clamps 200 can be installed on the original workbench 100. After improvement, six hub bearing drilling and tapping clamps 200 can be installed. Through the improvement of the machining method, the chamfering of the bottom end of the hole does not need to be reprocessed by turning over the workpiece, which greatly improves the production efficiency of the enterprise and improves the production capacity of the enterprise.

[0072] The above is only an embodiment of the present application, and the specific technical solutions and / or common knowledge of the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application. These will not affect the effect and practicality of the patent. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A hub bearing drilling and tapping fixture comprising a plurality of clamping blocks capable of being brought closer to the center of a hub bearing, characterized in that: The clamping block is used for clamping on the flange outer periphery of the hub bearing, and further comprises a supporting column for supporting the flange of the hub bearing, the contact position of the supporting column with the flange avoids the position requiring to be holed on the flange; and further comprises a positioning member for limiting the circumferential rotation of the hub bearing; The positioning member is horizontally slidably connected to the fixedly arranged mounting seat, the mounting seat is fixed on the workbench, a spring is arranged between the mounting seat and the positioning member, the extension direction of the spring is parallel to the radial direction of the hub bearing, the sliding direction of the positioning member is parallel to the radial direction of the hub bearing, and the spring is used for pushing the positioning member towards the hub bearing. The supporting column is internally hollow and the top and bottom are both through holes, the hole position requiring to be holed on the flange is located in the hollow space of the supporting column, and the bottom through hole of the supporting column is communicated with a chip removal channel. Further comprising a ring-shaped seat and a cylinder claw located in the ring-shaped seat, the cylinder claw comprises a connecting ring and a plurality of elastic clamping claws circumferentially distributed on the connecting ring, each elastic clamping claw is provided with a clamping block, the elastic clamping claw is matched with the ring-shaped seat through a slope, and the connecting ring vertically moves, and the elastic clamping claw can move along the slope. Further comprising a chip removal cylinder located below the supporting column, the chip removal cylinder forms the chip removal channel, the chip removal cylinder can vertically move, and the chip removal cylinder is fixedly connected with the connecting ring. Further comprising a ring-shaped positioning seat, the chip removal cylinder penetrates through the ring-shaped positioning seat, the ring-shaped positioning seat is provided with a ring-shaped groove surrounding the chip removal cylinder, a closed cavity is formed between the ring-shaped groove and the chip removal cylinder, a piston is fixedly connected on the outer periphery of the chip removal cylinder, the piston is vertically slidably connected on the ring-shaped groove and divides the cavity into two independent chambers, and each chamber is communicated with a flow channel. The chip removal cylinder is fixedly connected with a pull plate, the pull plate and the connecting ring are located on the upper and lower sides of the ring-shaped positioning seat, a connecting rod is fixedly connected between the pull plate and the connecting ring, and the connecting rod is vertically slidably connected on the ring-shaped positioning seat.

2. The hub bearing drilling and tapping fixture of claim 1, wherein: The ring-shaped positioning seat comprises an upper cylindrical segment and a lower cylindrical segment, the outer diameter of the lower cylindrical segment is larger than that of the upper cylindrical segment, and the lower cylindrical segment is partially embedded in the ring-shaped seat, the ring-shaped gap between the ring-shaped seat and the upper cylindrical segment is used for accommodating the connecting ring, the ring-shaped seat is provided with a weight-reducing groove with an opening facing upwards, and the weight-reducing groove and the clamping block are circumferentially staggered distributed on the ring-shaped seat.

3. The hub bearing drilling and tapping fixture of claim 1, wherein: The bottom through hole of the supporting column is a tapered hole, and the small-size end of the tapered hole is close to the chip removal channel.

4. A method of machining a wheel bearing bore and tapping, characterized in that The workpiece needs to be clamped by the hub bearing drilling and tapping clamp as claimed in any one of claims 1-3, the positioning member can be pressed on the non-machining position of the upper surface of the flange, and further comprising the following machining steps: S1, machining the hole position; S2, adopting the mode of inserting the hooking cutter from top to bottom into the hole position to chamfer the bottom end of the hole.

5. The machining method of the hub bearing drilling and tapping according to claim 4, characterized in that: The hub bearing drilling and tapping clamp has a plurality of hub bearing drilling and tapping clamps, and the plurality of hub bearing drilling and tapping clamps are installed on the same workbench.

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