A processing tooling for a bearing hub and its processing method

Abstract

The present invention belongs to the technical field of machining, and provides a machining tooling for a bearing hub and a machining method thereof. The tooling includes an Op10 process tooling and an Op20 process tooling; the Op20 process tooling includes a bottom plate, a first station, and a second station; the first station includes a first base fixedly installed on the bottom plate, and a plurality of groups of fifth lifting mechanisms, two positioning blocks, and a first positioning pin adapted to the bearing hub are fixedly installed on the first base; a fifth pressing head is fixedly connected to the lifting end of the fifth lifting mechanism; the second station includes: a second base, an auxiliary stop block, and a limiting block fixedly installed on the bottom plate; a fourth lifting mechanism is fixedly installed on the limiting block, and a fourth pressing head is fixedly connected to the lifting end of the fourth lifting mechanism. This tooling can concentrate three processes of the bearing hub on two sets of jigs, and successfully solve the problems of the consistency of the bore diameter machining of the bearing hub and the spatial angle of drilling inclined oil holes.

Description

Technical Field

[0001] The present invention belongs to the technical field of machining, and particularly relates to a machining tooling for a bearing hub and a machining method thereof. Background Art

[0002] The bearing hub is a key component of the balance suspension of the commercial vehicle chassis system. Since the production program of the bearing hub belongs to small-batch production and has high precision, a large number of equipment is required according to the traditional machining method. Among them, drilling the inclined oil hole is usually processed on a radial drill, but with the development of machining technology, the use of a radial drill has low efficiency and is not sufficient to meet the current machining requirements. Moreover, the manual labor intensity of the radial drill is large, and a large number of toolings are also required.

[0003] The existing machining process of the bearing hub is shown in the following table:

[0004]

[0005] When using a 630 horizontal machining center (exchangeable pallet) to machine the bearing hub, three sets of positioning toolings are required according to the existing machining process of the bearing hub. However, the 630 horizontal machining center only has two pallets and can only machine the first two processes. Therefore, there are two ways for the inclined oil hole drilling process:

[0006] 1) Separately add a radial drill to machine the inclined oil hole;

[0007] 2) Separately add one 630 horizontal machining center.

[0008] Both of the above two methods have the following problems: additional investment, an additional set of fixtures and an operator are required, which does not meet the purpose of modern enterprises to save manpower and optimize the investment cost. Summary of the Invention

[0009] Aiming at the deficiencies of the existing technology, the present invention provides a machining tooling for a bearing hub and a machining method thereof, which concentrate the three processes of the bearing hub on two sets of fixtures and successfully solve the problems of the machining consistency of the bearing hub aperture and the spatial angle of drilling the inclined oil hole.

[0010] To achieve the above object, the present invention adopts the following technical solutions: On the one hand, the present invention provides a machining tooling for a bearing hub, including an Op10 process tooling and an Op20 process tooling;

[0011] The Op10 process tooling includes a bottom plate, and a first limiting member, a second limiting member, a third limiting member, and two fourth limiting members are fixedly installed on the bottom plate;

[0012] A first lifting mechanism is fixedly installed on the first limiting member. The lifting end of the first lifting mechanism is fixedly connected to a first pressing head. A first screw hole is formed through the side wall of the first limiting member, and a first screw rod is screwed in the first screw hole;

[0013] A second lifting mechanism is fixedly installed on the second limiting member. The lifting end of the second lifting mechanism is fixedly connected to a second pressing head. A second screw hole is formed through the side wall of the second limiting member, and a second screw rod is screwed in the second screw hole;

[0014] A third lifting mechanism is fixedly installed on the third limiting member. The lifting end of the third lifting mechanism is fixedly connected to a third pressing head;

[0015] The Op20 process tooling includes a bottom plate, a first working station, and a second working station;

[0016] The first working station includes a first base fixedly installed on the bottom plate. A plurality of groups of fifth lifting mechanisms, two positioning blocks, and a first positioning pin adapted to the bearing hub are fixedly installed on the first base;

[0017] The first positioning pin is arranged between the two positioning blocks;

[0018] The lifting end of the fifth lifting mechanism is fixedly connected to a fifth pressing head;

[0019] The second working station includes a second base, an auxiliary stop block, and a limiting block fixedly installed on the bottom plate;

[0020] A first inclined surface is formed on one side of the second base close to the auxiliary stop block. A second positioning pin is fixedly arranged on the first inclined surface. An insertion port is formed on the second positioning pin, and a movable shaft is detachably inserted into the insertion port. A pressing plate for pressing the bearing hub is fixedly connected to one end of the movable shaft away from the insertion port;

[0021] A second inclined surface is formed on one side of the auxiliary stop block close to the second base. The first inclined surface and the second inclined surface together form an included angle structure adapted to the bearing hub;

[0022] A fourth lifting mechanism is fixedly installed on the limiting block. The lifting end of the fourth lifting mechanism is fixedly connected to a fourth pressing head.

[0023] Preferably, the Op10 process tooling further includes an auxiliary support member, and the auxiliary support member is fixedly installed on the bottom plate.

[0024] Preferably, the auxiliary support member is of a telescopic structure.

[0025] Preferably, a third lateral positioning point is fixedly provided on the side wall of the third limiting member, and fourth lateral positioning points are fixedly provided on the side walls of the two fourth limiting members.

[0026] Preferably, a first positioning point is fixedly provided on the upper surface of the first limiting member, a second positioning point is fixedly provided on the upper surface of the second limiting member, and a third positioning point is fixedly provided on the upper surface of the third limiting member.

[0027] Preferably, the first working station further includes an auxiliary lifting mechanism fixedly installed on the first base, and an auxiliary pressing head is fixedly connected to the lifting end of the auxiliary lifting mechanism.

[0028] Preferably, four sets of the fifth lifting mechanisms are fixedly installed on the first base. The four sets of the fifth lifting mechanisms are divided into two rows with two in a row, and the two positioning blocks are arranged between the two rows of the fifth lifting mechanisms.

[0029] Preferably, the second working station further includes a baffle fixedly installed on the bottom plate.

[0030] Preferably, a convex structure adapted to the bearing hub is fixedly provided on the second inclined surface.

[0031] On the other hand, the present invention provides a processing method for a bearing hub, including the following steps:

[0032] S1. Hoist the bearing hub onto the Op10 sequence tooling, making the clamping between the bearing hub and the Op10 sequence tooling reliable. The Op10 sequence tooling rotates and exchanges from the loading station to the working station for CNC machining. The machining sequence is: milling the straight groove → milling the 10° inclined surfaces at both ends → drilling and reaming the Φ30 pin holes → the pallet rotates 180° → machining the 4-Φ28 through holes → the pallet rotates 180°. After the machining is completed, the Op10 sequence tooling rotates and exchanges from the working station to the loading station, and the bearing hub is unloaded. Among them, while the Op10 sequence tooling is working at the working station, the loading and clamping of the Op20 sequence tooling are carried out.

[0033] S2. The Op20 sequence tooling rotates and exchanges from the loading station to the working station, and then carries out CNC machining. The machining sequence is: rough and semi-finish milling the hexagonal end face → rough boring the Φ110 bearing hole → the pallet rotates 180° → rough and finish milling the cylindrical end face and the hole chamfer → drilling the Φ8.5 inclined oil hole and tapping the Rc1 / 8 threaded hole → the pallet rotates 180° → semi-finish boring the Φ110 bearing hole → finish reaming the Φ110 bearing hole → finish milling the hexagonal end face and drilling the 6-M10 threaded holes. Among them, while the Op20 sequence tooling is working at the working station, the loading and clamping of the Op10 sequence tooling are carried out.

[0034] S3. After processing is completed, the fixture for the Op20 process rotates and exchanges from the working station to the loading station. Then, the bearing hubs on the first and second stations of the Op20 process fixture are unloaded, and the bearing hub unloaded from the first station is clamped to the second station. Then, the bearing hub unloaded from the Op10 process fixture is clamped to the first station, and the steps of S1 and S2 are repeated and processed alternately in a cycle.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] 1. For a processing fixture and its processing method for a bearing hub provided by the present invention, when using this processing fixture for processing, the two processes of boring the bearing hole, milling the cylindrical end, the hexagonal end face and the inclined oil hole can be combined on a set of fixtures. Among them, when the fixture for the Op20 process processes the cylindrical end face and the hexagonal end face, it is achieved by rotating the pallet by 180°. The control of the spatial angle of the inclined oil hole is achieved by setting the second base and the auxiliary stop block. The second base and the auxiliary stop block together form an included angle structure. After clamping the bearing hub, the inclined oil hole can be kept horizontal, and then its angle is controlled by rotating the pallet so that the inclined oil hole is aligned with the processing tool to drill the inclined oil hole. Moreover, when designing the fixture for the Op20 process, the interference problem of the module tool for drilling the inclined oil hole is fully considered, effectively solving the problem in the prior art that when drilling the inclined oil hole, an additional set of fixtures and an additional operator are required.

[0037] 2. For a processing fixture and its processing method for a bearing hub provided by the present invention, the Φ110 bearing hole is processed by the method of rough boring - semi - fine boring - chamfering the hole opening - fine reaming. This is because in the prior art, for the processing of the Φ110 bearing hole, the commonly used process is rough boring - semi - fine boring - fine boring. However, due to the horizontal difference of manually adjusting the fine boring tool, the problem that the bored hole is often too large or too small and out of tolerance often occurs, and the diameter requirement of the Φ110 bearing hole cannot be well guaranteed. The processing method provided by the present invention can avoid the problem that the hole diameter is inconsistent due to manual errors, thus effectively ensuring the processing quality and process stability of the balance bearing hub. Description of the Drawings

[0038] Figure 1 It is a three - dimensional structure schematic diagram of the Op10 process fixture of a processing fixture for a bearing hub provided by an embodiment of the present invention;

[0039] Figure 2 It is a three - dimensional structure schematic diagram of the Op10 process fixture of a processing fixture for a bearing hub provided by an embodiment of the present invention after clamping the bearing hub;

[0040] Figure 3 It is a three - dimensional structure schematic diagram of the Op20 process fixture of a processing fixture for a bearing hub provided by an embodiment of the present invention;

[0041] Figure 4Schematic three-dimensional structure diagram of the Op20 process tooling for a bearing hub processing tooling provided by an embodiment of the present invention after clamping the bearing hub;

[0042] Figure 5 Schematic top view structure diagram of a 630 horizontal machining center in the prior art;

[0043] Figure 6 Schematic three-dimensional structure diagram of the Op20 process tooling for a bearing hub processing tooling provided by an embodiment of the present invention when drilling an inclined oil hole;

[0044] Figure 7 Schematic side view structure diagram of the Op20 process tooling for a bearing hub processing tooling provided by an embodiment of the present invention when drilling an inclined oil hole;

[0045] Figure 8 Schematic side view structure diagram of a bearing hub when a straight groove is milled by a bearing hub processing tooling provided by an embodiment of the present invention;

[0046] Figure 9 Schematic side view structure diagram of a bearing hub when a pin hole is drilled and reamed by a bearing hub processing tooling provided by an embodiment of the present invention;

[0047] Figure 10 Schematic front and side view structure diagrams of a bearing hub when a hexagonal end face is milled by a bearing hub processing tooling provided by an embodiment of the present invention;

[0048] Figure 11 Schematic three-dimensional structure diagram of a bearing hub in the prior art.

[0049] In the drawings, the list of components represented by each reference numeral is as follows:

[0050] 1. Op10 process tooling;

[0051] 100. Base plate;

[0052] 110. First limiting member; 111. First positioning point; 112. First lifting mechanism; 113. First pressing head; 114. First screw;

[0053] 120. Second limiting member; 121. Second positioning point; 122. Second lifting mechanism; 123. Second pressing head; 124. Second screw;

[0054] 130. Third limiting member; 131. Third positioning point; 132. Third lifting mechanism; 133. Third pressing head; 134. Third lateral positioning point;

[0055] 140. Fourth limiting member; 141. Fourth lateral positioning point;

[0056] 150. Auxiliary support member;

[0057] 2. Op20 Sequencing Tooling;

[0058] 200. Base Plate;

[0059] 210. First Base; 250. Fifth Lifting Mechanism; 260. Positioning Block; 270. First Positioning Pin; 251. Fifth Pressing Head; 280. Auxiliary Lifting Mechanism; 281. Auxiliary Pressing Head;

[0060] 220. Second Base; 221. First Inclined Plane; 222. Second Positioning Pin; 223. Movable Shaft; 224. Pressing Plate;

[0061] 230. Auxiliary Stopper; 231. Second Inclined Plane;

[0062] 240. Limit Block; 241. Fourth Lifting Mechanism; 242. Fourth Pressing Head;

[0063] 290. Baffle;

[0064] 3. Bearing Hub;

[0065] 310. Straight Groove; 320. 10° Inclined Plane; 330. Pin Hole; 340. Through Hole; 350. Hexagonal End Face; 360. Bearing Hole; 370. Threaded Hole; 380. Cylindrical End Face; 390. Inclined Oil Hole;

[0066] 4. Loading Station; 5. Working Station. Detailed Embodiment

[0067] The present invention will be further described in detail below with reference to specific embodiments, so that those skilled in the art can understand the present invention more clearly.

[0068] It should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection" and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrally formed structure. For those of ordinary skill in the art, the specific meanings of such terms in this patent can be understood according to specific circumstances.

[0069] As Figure 11 shown, the bearing hub 3 of the embodiment of the present invention has high dimensional accuracy and the material is QT700-3. The coaxiality of the Φ110 bearing hole 360 and the Φ160 cylindrical end face 380 is 0.05 mm, and the perpendicularity of the two end faces of the bearing hole 360 to the bearing hole 360 is 0.05 mm. In addition to the 89(+0.2,0) straight groove 310 and the two end faces, the bearing hub 3 also has an inclined oil hole 390 with a spatial angle of Φ8.5 (three spatial angles: 15.15°, 51.096°, 20°).

[0070] AsFigure 5 As shown, the 630 horizontal machining center has only two pallets: the loading station 4 and the working station 5. The loading station 4 and the working station 5 can be rotated and exchanged with each other. Moreover, both pallets can rotate 360° by themselves. When performing CNC machining, only the parts on one pallet can be machined at a time.

[0071] Based on the above structure, an embodiment of the present invention provides a processing tooling for a bearing hub, including the Op10 process tooling 1 and the Op20 process tooling 2. The Op10 process tooling 1 can be installed on the loading station 4, and the Op20 process tooling 2 can be installed on the working station 5.

[0072] Embodiment 1

[0073] As Figure 1 shown, the Op10 process tooling 1 provided by the embodiment of the present invention includes a bottom plate 100, and a first limiting member 110, a second limiting member 120, a third limiting member 130, and two fourth limiting members 140 are fixedly installed on the bottom plate 100;

[0074] A first lifting mechanism 112 is fixedly installed on the first limiting member 110, the lifting end of the first lifting mechanism 112 is fixedly connected to a first pressing head 113, a first screw hole is penetrated through the side wall of the first limiting member 110, and a first screw rod 114 is screwed in the first screw hole;

[0075] A second lifting mechanism 122 is fixedly installed on the second limiting member 120, the lifting end of the second lifting mechanism 122 is fixedly connected to a second pressing head 123, a second screw hole is penetrated through the side wall of the second limiting member 120, and a second screw rod 124 is screwed in the second screw hole;

[0076] A third lifting mechanism 132 is fixedly installed on the third limiting member 130, and the lifting end of the third lifting mechanism 132 is fixedly connected to a third pressing head 133;

[0077] Specifically, the first limiting member 110, the second limiting member 120, the third limiting member 130, and the two fourth limiting members 140 are arranged at the five end points of a pentagram structure, and the bearing hub 3 can be hoisted onto the tooling and placed in the middle of the pentagram structure, and the bearing hub 3 is pushed in place.

[0078] Then, the first lifting mechanism 112 can drive the first pressing head 113 to descend and press and fix the bearing hub 3; the second lifting mechanism 122 can drive the second pressing head 123 to descend and press and fix the bearing hub 3; the third lifting mechanism 132 can drive the third pressing head 133 to descend and press and fix the bearing hub 3. Then, by rotating the first screw rod 114, the end of the first screw rod 114 is made to abut against the bearing hub 3; by rotating the second screw rod 124, the end of the second screw rod 124 is made to abut against the bearing hub 3, and thus the bearing hub 3 can be clamped reliably.

[0079] Wherein, the first screw rod 114 can be perpendicular to the second screw rod 124, so that the limiting directions of the first screw rod 114 and the second screw rod 124 on the bearing hub 3 are different.

[0080] Such as Figure 2 shown, after clamping the bearing hub 3 on the Op10 sequence tooling 1, the hexagonal end face 350 of the bearing hub 3 can be made to face upward and the straight groove 310 can be made to face forward, and thus the machining of the Op10 sequence can be carried out.

[0081] Wherein, the structure for milling the straight groove 310 is as Figure 8 shown, the structure for drilling and reaming the pin hole 330 is as Figure 9 shown, and the 10° inclined surfaces 320 at both ends of the straight groove are formed by rotating the pallet by 10° and then machining by a milling cutter for the straight groove.

[0082] In this embodiment, the lifting mechanism is a prior art. For example, the first lifting mechanism 112 can be a cylinder, the telescopic end of the cylinder is fixedly connected to the first pressing head 113, and the first pressing head 113 can be driven to rise or fall by the telescoping of the cylinder. Similarly, the other lifting mechanisms can also be cylinders, and details will not be elaborated here one by one.

[0083] In this embodiment, the Op10 sequence tooling 1 further includes an auxiliary support member 150, and the auxiliary support member 150 is fixedly installed on the bottom plate 100. The auxiliary support member 150 is of a telescopic structure. The auxiliary support member 150 can play a role in supporting the bearing hub 3 and effectively improve the stability of the bearing hub 3 during the machining process.

[0084] In this embodiment, a third lateral positioning point 134 is fixedly provided on the side wall of the third limiting member 130, and fourth lateral positioning points 141 are fixedly provided on the side walls of the two fourth limiting members 140. The third lateral positioning point 134 and the two fourth lateral positioning points 141 are all adapted to the bearing hub 3. Combining with the first screw rod 114 and the second screw rod 124, a stable clamping effect on the bearing hub 3 in the horizontal direction can be achieved.

[0085] In this embodiment, a first positioning point 111 is fixedly provided on the upper surface of the first limiting member 110, a second positioning point 121 is fixedly provided on the upper surface of the second limiting member 120, and a third positioning point 131 is fixedly provided on the upper surface of the third limiting member 130. The first positioning point 111, the second positioning point 121, and the third positioning point 131 are adapted to the cylindrical end face 380 of the bearing hub 3. Combining with the first pressing head 113, the second pressing head 123, and the third pressing head 133 can play a stable clamping role in the up and down direction for the bearing hub 3, ensuring reliable clamping of the bearing hub 3.

[0086] Embodiment 2

[0087] As Figure 3 shown, the Op20 sequence tooling 2 includes a bottom plate 200, a first working station, and a second working station. The first working station is used for boring the bearing hole, milling the surface, and drilling holes, and the second working station is used for drilling inclined oil holes. During the processing, the tooling is installed on the machine tool and rotated 180° through the pallet, and different parts of the bearing hub can be processed.

[0088] The first working station includes a first base 210 fixedly installed on the bottom plate 200. Four groups of fifth lifting mechanisms 250, two positioning blocks 260, and a first positioning pin 270 adapted to the bearing hub 3 are fixedly installed on the first base 210;

[0089] The four groups of fifth lifting mechanisms 250 are arranged in two rows with two in each row. The two positioning blocks 260 are arranged between the two rows of fifth lifting mechanisms 250;

[0090] The first positioning pin 270 is arranged between the two positioning blocks 260;

[0091] The lifting end of the fifth lifting mechanism 250 is fixedly connected with a fifth pressing head 251.

[0092] Specifically, as Figure 4 shown, the bearing hub 3 is placed on the positioning block 260, and then the fifth lifting mechanism 250 can drive the fifth pressing head 251 to descend. The fifth pressing head 251 can press and fix the bearing hub 3. At this time, the first positioning pin 270 and the positioning block 260 can play a stable supporting role for the bearing hub 3, so as to clamp the bearing hub 3 on the first working station and make the cylindrical end face 380 of the bearing hub 3 face forward. Other processing steps in the Op20 sequence except drilling the inclined oil hole can be carried out.

[0093] Among them, the structure of milling the hexagonal end face 350 is as Figure 10 shown.

[0094] In this embodiment, the first station further includes an auxiliary lifting mechanism 280 fixedly installed on the first base 210, and an auxiliary pressing head 281 is fixedly connected to the lifting end of the auxiliary lifting mechanism 280.

[0095] The auxiliary pressing head 281 can be driven to descend by the auxiliary lifting mechanism 280, and the auxiliary pressing head 281 can press and fix the bearing hub 3, further improving the stability of the bearing hub 3 during the processing.

[0096] Please refer to Figure 3 again. The second station includes: a second base 220, an auxiliary stop block 230, and a limit block 240 fixedly installed on the bottom plate 200;

[0097] On one side of the second base 220 close to the auxiliary stop block 230, a first inclined surface 221 is formed. A second positioning pin 222 is fixedly provided on the first inclined surface 221. An insertion port is provided on the second positioning pin 222, and a movable shaft 223 is detachably inserted into the insertion port. A pressing plate 224 for pressing the bearing hub 3 is fixedly connected to the end of the movable shaft 223 away from the insertion port;

[0098] On one side of the auxiliary stop block 230 close to the second base 220, a second inclined surface 231 is formed. The first inclined surface 221 and the second inclined surface 231 together form an included angle structure adapted to the bearing hub 3;

[0099] A fourth lifting mechanism 241 is fixedly installed on the limit block 240, and a fourth pressing head 242 is fixedly connected to the lifting end of the fourth lifting mechanism 241.

[0100] Among them, the lifting mechanisms are the same as those in Embodiment 1 and are all prior arts, so they will not be elaborated here one by one.

[0101] Among them, the movable shaft 223 and the insertion port can be in threaded connection. For example, the insertion port is provided with internal threads, the end of the movable shaft 223 is provided with external threads, and the end of the movable shaft 223 is threadedly connected to the insertion port. By rotating the movable shaft 223, the movable shaft 223 can be disassembled.

[0102] Such as Figure 4As shown, after removing the movable shaft 223, the bearing hub 3 can be placed within the included angle structure formed by the first inclined surface 221 and the second inclined surface 231. Then, the end of the movable shaft 223 is passed through the bearing hole 360 of the bearing hub 3 and plugged and fixed to the socket again. At this time, the first inclined surface 221 can abut against the cylindrical end face 380 of the bearing hub 3, and the pressing plate 224 can abut against the hexagonal end face 350 of the bearing hub 3, thereby clamping the bearing hub 3 on the second base 220. Then, the fourth lifting mechanism 241 is used to drive the fourth pressing head 242 to descend, and the fourth pressing head 242 can press and fix the bearing hub 3, thus clamping the bearing hub 3 at the second station. At the same time, the second inclined surface 231 can abut against the surface where the straight groove 310 of the bearing hub 3 is located, so that the bearing hub 3 maintains a stable angle, and at this time, the inclined oil hole 390 of the bearing hub 3 is horizontally arranged, facilitating the smooth progress of subsequent processing.

[0103] Therefore, the fixture for the Op20 process 2 can combine the two processes of boring the bearing hole, milling the cylindrical end face, hexagonal end face, and inclined oil hole onto one set of fixtures. Moreover, when machining the cylindrical end face and the hexagonal end face, it is achieved by rotating the pallet 180°. The control of the spatial angle of the inclined oil hole is realized by setting the second base 220 and the auxiliary stop block 230. The second base 220 and the auxiliary stop block 230 together form an included angle structure. After clamping the bearing hub 3, its inclined oil hole 390 can be kept horizontal, and then its angle is controlled by rotating the pallet. As Figures 6 - 7 shown, align the inclined oil hole 390 with the processing tool to drill the inclined oil hole. Moreover, when designing the fixture, the interference problem of the drill bit of the inclined oil hole module is fully considered, effectively solving the problem in the prior art that an additional set of fixtures and an additional operator are required when drilling the inclined oil hole.

[0104] In this embodiment, the second station further includes a baffle 290 fixedly installed on the bottom plate 200. The baffle 290 can abut against the side wall of the bearing hub 3, further enhancing the stability of the bearing hub 3 during the processing.

[0105] In this embodiment, a convex structure adapted to the bearing hub 3 is fixedly provided on the second inclined surface 231. This convex structure can enhance the support stability of the second inclined surface 231 for the bearing hub 3.

[0106] On the other hand, the embodiment of the present invention provides a processing method for a bearing hub, which is processed on a 630 horizontal machining center, and specifically includes the following steps:

[0107] S1. Lift and install the bearing hub 3 onto the Op10 process tooling 1 to ensure reliable clamping between the bearing hub 3 and the Op10 process tooling 1. The Op10 process tooling 1 rotates and exchanges from the loading station 4 to the working station 5 for CNC machining. The machining sequence is: milling the straight groove 310 → milling the 10° inclined surfaces at both ends 320 → drilling and reaming the Φ30 pin holes 330 → rotating the pallet 180° → machining the 4-Φ28 through holes 340 → rotating the pallet 180°. After machining, the Op10 process tooling 1 rotates and exchanges from the working station 5 to the loading station 4, and the bearing hub 3 is unloaded. Among them, while the Op10 process tooling 1 is working at the working station 5, the loading and clamping of the Op20 process tooling 2 are carried out.

[0108] S2. The Op20 process tooling 2 rotates and exchanges from the loading station 4 to the working station 5, and then CNC machining is carried out. The machining sequence is: rough and semi-finish milling the hexagonal end face 350 → rough boring the Φ110 bearing hole 360 → rotating the pallet 180° → rough and finish milling the cylindrical end face 380 and the chamfer at the hole opening → drilling the Φ8.5 inclined oil hole 390 and tapping the Rc1 / 8 threaded hole → rotating the pallet 180° → semi-finish boring the Φ110 bearing hole 360 → finish reaming the Φ110 bearing hole 360 → finish milling the hexagonal end face 350 and drilling the 6-M10 threaded holes 370. Among them, while the Op20 process tooling 2 is working at the working station 5, the loading and clamping of the Op10 process tooling 1 are carried out.

[0109] S3. After machining, the Op20 process tooling 2 rotates and exchanges from the working station 5 to the loading station 4, then unloads the bearing hubs 3 on the first and second stations of the Op20 process tooling 2, clamps the bearing hub 3 unloaded from the first station to the second station, and then clamps the bearing hub 3 unloaded from the Op10 process tooling 1 to the first station. Repeat the steps of S1 and S2 in an alternating cycle for machining.

[0110] In summary, the machining process of the bearing hub 3 in this embodiment can be as shown in the following table.

[0111]

[0112] In the embodiment of the present invention, the method of rough boring - semi - fine boring - chamfering the hole opening - fine reaming is adopted to machine the Φ110 bearing hole 360. This is because in the prior art, for the machining of the Φ110 bearing hole, the commonly used process is rough boring - semi - fine boring - fine boring. However, due to the horizontal differences in manually adjusting the fine boring tool, problems such as the bored hole being sometimes larger and sometimes smaller and exceeding the tolerance often occur, and the aperture requirements of the Φ110 bearing hole 360 cannot be well guaranteed. The machining method provided by the present invention can avoid the problem of inconsistent aperture sizes caused by manual errors, effectively guarantee the machining accuracy, that is, guarantee the aperture tolerance of the precision batch machining of the bearing hole Φ110(+0.035,0), the reference A hole of the hexagonal end face, the perpendicularity between the hexagonal end face and the bearing hole Φ110(+0.035,0) is 0.05 mm, the flatness is 0.03 mm, and the coaxiality between the cylindrical end face hole Φ160(+0.063,0) and the bearing hole Φ110(+0.035,0) is 0.05 mm.

[0113] This machining method is simple, has good consistency, and reliable quality. At the same time, the machining process of the bearing hub and the design method of the composite fixture are provided.

[0114] The mechanisms, components, and parts not described in detail in the structure of the present invention are all existing structures that already exist in the prior art and can be directly purchased from the market.

[0115] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present invention. In addition, "first" and "second" are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0116] The above is only a preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for processing a bearing hub, characterized in that: The steps include: S1. The bearing hub (3) is hoisted onto the Op10 sequence fixture (1) so that the bearing hub (3) and the Op10 sequence fixture (1) are reliably clamped. The Op10 sequence fixture (1) is rotated and exchanged from the loading station (4) to the working station (5) for CNC processing. The processing sequence is: milling straight grooves (310) → milling 10° bevels (320) at both ends → drilling and reaming Φ30 pin holes (330) → rotating the pallet 180° → processing 4-Φ28 through holes (340) → rotating the pallet 180°. After the processing is completed, the Op10 sequence fixture (1) is rotated and exchanged from the working station (5) to the loading station (4) to remove the bearing hub (3). The Op10 sequence fixture (1) is loaded and clamped by the Op20 sequence fixture (2) while working at the working station (5). S2, Op20 sequence tooling (2) is rotated and exchanged from the loading station (4) to the working station (5), and then CNC processing is carried out. The processing sequence is: rough and semi-finishing milling of the hexagonal end face (350) → rough boring of Φ110 bearing hole (360) → pallet rotation 180° → rough and fine milling of the cylindrical end face (380) and chamfering of the hole mouth → drilling Φ8.5 inclined oil hole (390) and tapping Rc1 / 8 threaded hole → pallet rotation 180° → semi-finishing boring of Φ110 bearing hole (360) → fine reaming of Φ110 bearing hole (360) → fine milling of the hexagonal end face (350) and drilling of 6-M10 threaded hole (370). Among them, Op20 sequence tooling (2) is loading and clamping Op10 sequence tooling (1) while working at the working station (5); S3. After the processing is completed, the Op20 sequence tooling (2) is rotated and exchanged from the working station (5) to the loading station (4), and then the bearing hub (3) on the first and second stations of the Op20 sequence tooling (2) is removed, and the bearing hub (3) removed from the first station is clamped to the second station, and then the bearing hub (3) removed from the Op10 sequence tooling (1) is clamped to the first station, and the steps of S1 and S2 are repeated alternately for processing; The Op10 sequence tooling (1) comprises a base plate, on which a first limiting member (110), a second limiting member (120), a third limiting member (130), and two fourth limiting members (140) are fixedly mounted; A first lifting mechanism (112) is fixedly mounted on the first limiting member (110), a lifting end of the first lifting mechanism (112) is fixedly connected to a first pressing head (113), a first screw hole is provided through the side wall of the first limiting member (110), and a first screw rod (114) is screwed into the first screw hole; A second lifting mechanism (122) is fixedly mounted on the second position-limiting member (120), a lifting end of the second lifting mechanism (122) is fixedly connected to a second pressing head (123), a second screw hole is provided through the side wall of the second position-limiting member (120), and a second screw rod (124) is screwed into the second screw hole; A third lifting mechanism (132) is fixedly mounted on the third position-limiting member (130), and a lifting end of the third lifting mechanism (132) is fixedly connected to a third pressure head (133); The Op20 sequence tooling (2) includes a base plate, a first station, and a second station; The first station comprises a first base (210) fixedly mounted on the bottom plate, and the first base (210) is fixedly mounted with a plurality of fifth lifting mechanisms (250), at least two positioning blocks (260), and a first positioning pin (270) adapted to the bearing hub (3); The first positioning pin (270) is arranged between the two positioning blocks (260); A fifth pressing head (251) is fixedly connected to the lifting end of the fifth lifting mechanism (250); The second station comprises: a second base (220), an auxiliary stopper (230), and a limit block (240) fixedly mounted on the bottom plate; A first inclined surface (221) is formed on a side of the second base (220) close to the auxiliary stopper (230), a second positioning pin (222) is fixedly provided on the first inclined surface (221), a plug-in interface is provided on the second positioning pin (222), a movable shaft (223) is detachably plugged into the plug-in interface, and a pressure plate (224) for pressing the bearing hub (3) is fixedly connected to one end of the movable shaft (223) away from the plug-in interface; A second inclined surface (231) is formed on one side of the auxiliary stopper (230) close to the second base (220), and the first inclined surface (221) and the second inclined surface (231) together form an angle structure adapted to the bearing hub (3); A fourth lifting mechanism (241) is fixedly mounted on the limiting block (240), and a lifting end of the fourth lifting mechanism (241) is fixedly connected to a fourth pressure head (242).

2. The machining method of a bearing hub according to claim 1, characterized in that, The Op10 sequence tooling (1) further comprises an auxiliary support member (150), wherein the auxiliary support member (150) is fixedly mounted on the base plate.

3. A method for processing a bearing hub according to claim 2, characterized in that: The auxiliary support member (150) is a telescopic structure.

4. A machining method of a bearing hub according to claim 1, characterized in that, A third lateral positioning point (134) is fixedly provided on the side wall of the third limiting member (130), and a fourth lateral positioning point (141) is fixedly provided on the side walls of both fourth limiting members (140).

5. A processing method of a bearing hub according to claim 1, characterized in that, A first positioning point (111) is fixedly provided on the upper surface of the first limiting member (110), a second positioning point (121) is fixedly provided on the upper surface of the second limiting member (120), and a third positioning point (131) is fixedly provided on the upper surface of the third limiting member (130).

6. The method for processing a bearing hub according to claim 1, characterized in that: The first workstation further comprises an auxiliary lifting mechanism (280) fixedly mounted on the first base (210), and a lifting end of the auxiliary lifting mechanism (280) is fixedly connected to an auxiliary pressure head (281).

7. The method for processing a bearing hub according to claim 1, characterized in that: Four groups of the fifth lifting mechanisms (250) are fixedly mounted on the first base (210), and the four groups of the fifth lifting mechanisms (250) are arranged in two rows, so as to form two rows of the fifth lifting mechanisms (250). The two positioning blocks (260) are arranged between the two rows of the fifth lifting mechanisms (250).

8. The method for processing a bearing hub according to claim 1, characterized in that: The second workstation further comprises a baffle (290) fixedly mounted on the bottom plate.

9. A machining method of a bearing hub according to claim 1, characterized in that, A protruding structure adapted to the bearing hub (3) is fixedly provided on the second inclined surface (231).

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