CN115091123B

CN115091123B - Hub manufacturing method

Info

Publication number: CN115091123B
Application number: CN202210661816.3A
Authority: CN
Inventors: 阮吉高
Original assignee: Zhejiang Hengzhi New Material Co ltd
Current assignee: Zhejiang Hengzhi New Material Co ltd
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2024-04-19
Anticipated expiration: 2042-06-13
Also published as: CN115091123A

Abstract

The invention provides a hub manufacturing method, which comprises four steps of preparing a spoke with an insert, preparing a rim, welding the spoke onto the rim through the insert to obtain a hub semi-finished product, and finishing the hub semi-finished product. The wheel spoke is manufactured by using aluminum liquid as a raw material through a die casting method, a wheel rim is manufactured by using a steel belt as the raw material, the wheel spoke is welded to the wheel rim through a plurality of inserts to form an integrated wheel hub semi-finished product, and the wheel hub semi-finished product is subjected to finish machining to obtain a final wheel hub product. The spoke and the rim are prepared without dependence and can be simultaneously performed, so that the production efficiency is greatly improved; because the inserts which are the same as the rim material are adopted as the connecting pieces for welding, the spokes and the rim can be made of different materials, the spokes are made of aluminum alloy materials, and the rim and the inserts are made of steel materials, so that the structural strength is ensured and the cost is reduced.

Description

Hub manufacturing method

Technical Field

The invention relates to the technical field of vehicle parts, in particular to a hub manufacturing method.

Background

The wheel is constituted by a tyre and a hub, which is a rotating carrier interposed between the tyre and the axle, and generally by a rim for mounting and supporting the tyre and by a spoke, which is an important supporting member interposed between the axle and the rim.

The traditional hub is usually made of aluminum integrally or formed by welding a plurality of formed steel pieces, the former is attractive but high in cost, and the latter is low in cost but not attractive due to the fact that the welding lines are more. In order to overcome the defects of the two, there is a composite hub for compositing the two in the prior art, and the production process of the composite hub is generally as follows: firstly preparing a rim made of steel, then placing the rim into casting equipment, and casting to form the spoke integrated with the rim. In this production process, the manufacturing of the spoke must be started after the preparation of the corresponding rim is completed, so that the production efficiency is low.

Therefore, in order to solve the above-mentioned problems, to improve the production efficiency and reduce the cost on the premise of ensuring the structural strength of the hub, a new production process of the composite hub is needed, so that the preparation of the rim and the spoke are not mutually dependent any more, can be independently performed, and the rim and the spoke can be prepared by using different raw materials.

Disclosure of Invention

The invention is to solve the above problems, and the object of the invention is to provide a method for manufacturing a hub, which adopts the following technical scheme:

The invention provides a hub manufacturing method, which is used for manufacturing a hub, and the hub comprises a rim for mounting a tire and a spoke for supporting the rim, and is characterized by comprising the following steps of S1, preparing the spoke by using aluminum liquid as a raw material through a die casting method; s2, preparing a rim by using a steel belt as a raw material; s3, welding the spoke and the rim to obtain a hub semi-finished product; and S4, finishing the hub semi-finished product to obtain a hub, wherein the spoke is provided with a plurality of spokes, the end parts of the spokes are provided with inserts, and the spokes are welded to the rim through the inserts.

The hub manufacturing method provided by the invention can also have the technical characteristics that the step S1 comprises the following sub-steps: s1-1, putting a die corresponding to the spoke into a die casting machine; s1-2, respectively placing a plurality of inserts into a plurality of preset insert placement positions in a mold; s1-3, injecting aluminum liquid into a die casting machine and performing die casting molding to obtain a spoke semi-finished product; s1-4, cutting off a material handle of a spoke semi-finished product; and S1-5, polishing the spoke semi-finished product to obtain the spoke.

The hub manufacturing method provided by the invention can also have the technical characteristics that the die is a split die, the material of the inserts is the same as that of the rim, and the insert placement positions are arranged according to a preset rule.

The hub manufacturing method provided by the invention can also have the technical characteristics that the step S1 further comprises the substeps S1-7 of carrying out sand blasting on the spoke.

The hub manufacturing method provided by the invention can also have the technical characteristics that the step S2 comprises the following sub-steps: s2-1, coiling and end welding are carried out on the steel belt, and a steel ring with a welded joint is obtained; s2-2, rounding the steel ring; s2-3, spinning the expanded steel ring to enable the steel ring to have a structure matched with the tire; s2-4, expanding the spun steel ring to a calibrated size; s2-5, shaping the expanded steel ring; and S2-6, forming a valve core hole on the shaped steel ring to obtain the rim.

The hub manufacturing method provided by the invention can also have the technical characteristics that the method further comprises the step S2-5a before the step S2-7, and the pressure leakage detection is carried out on the welding seam; and step S2-5b, locating the welding seam, wherein in step S2-6, the valve core hole is opened at a position outside the welding seam on the steel ring.

The hub manufacturing method provided by the invention can also have the technical characteristics that the step S3 comprises the following sub-steps: s3-1, placing the spoke on a preset welding station; s3-2, nesting the rim on the outer ring of the spoke; and step S3-3, welding a plurality of inserts on the inner surface of the rim through a press welder to obtain a hub semi-finished product.

The hub manufacturing method provided by the invention can also have the technical characteristics that after the step S3-3, the method further comprises the step S3-4 of carrying out optical detection and pressure detection on a plurality of welding parts of the hub semi-finished product, wherein the optical detection is used for detecting whether the welding is missed or not in the plurality of welding parts, and the pressure detection is used for detecting whether the virtual welding is carried out in the plurality of welding parts.

The hub manufacturing method provided by the invention can also have the technical characteristics that the step S4 comprises the following sub-steps: s4-1, milling the surface of a hub semi-finished product; s4-2, punching a central hole and a bolt hole on a spoke of a hub semi-finished product; s4-3, respectively turning inner end surfaces of the central hole and the bolt hole to form corresponding internal threads; and S4-4, performing electrophoretic painting on the hub semi-finished product to obtain the hub.

The hub manufacturing method provided by the invention can also have the technical characteristics that the step S4 further comprises the substep S4-5 for detecting the hub.

The actions and effects of the invention

The hub manufacturing method comprises four steps of preparing a spoke with an insert, preparing a rim, welding the spoke onto the rim through the insert to obtain a hub semi-finished product, and finishing the hub semi-finished product. The wheel spoke is manufactured by using aluminum liquid as a raw material through a die casting method, a wheel rim is manufactured by using a steel belt as the raw material, the wheel spoke is welded to the wheel rim through a plurality of inserts to form an integrated wheel hub semi-finished product, and the wheel hub semi-finished product is subjected to finish machining to obtain a final wheel hub product. The spoke and the rim are prepared without dependence and can be simultaneously performed, so that the production efficiency is greatly improved; because the inserts are adopted as the connecting pieces for welding, the spokes and the rims can be made of different materials, the spokes are made of aluminum alloy materials, and the rims and the inserts are made of steel materials, so that the structural strength is ensured and the cost is reduced.

Drawings

FIG. 1 is a flow chart of a method of manufacturing a hub in accordance with an embodiment of the present invention;

FIG. 2 is a block diagram of an insert in an embodiment of the invention;

FIG. 3 is a block diagram of an automated spoke manufacturing apparatus in accordance with an embodiment of the present invention;

FIG. 4 is a schematic view of an automated spoke manufacturing apparatus in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of an insert-delivery device according to an embodiment of the present invention;

FIG. 6 is a block diagram of a mold in an embodiment of the invention;

FIG. 7 is an enlarged view of the portion of FIG. 6 within box A;

FIG. 8 is a schematic view of the structure of the automatic feeder in an embodiment of the present invention;

FIG. 9 is a schematic view of a work piece transferring apparatus according to an embodiment of the present invention;

FIG. 10 is a flowchart of step S1 of a hub manufacturing method in an embodiment of the present invention;

FIG. 11 is a block diagram of an automated rim production apparatus in accordance with an embodiment of the present invention;

FIG. 12 is a schematic view of an automated rim production apparatus in accordance with an embodiment of the present invention;

FIG. 13 is a schematic view of the structure of the steel rim after each process in the embodiment of the invention;

FIG. 14 is a flowchart of step S2 of the hub manufacturing method in an embodiment of the present invention;

FIG. 15 is a block diagram of an automated bonding apparatus in accordance with an embodiment of the present invention;

FIG. 16 is a schematic diagram of an automated bonding apparatus in accordance with an embodiment of the present invention;

FIG. 17 is a flowchart of step S3 of the hub manufacturing method in an embodiment of the present invention;

FIG. 18 is a block diagram of an automated hub finishing apparatus in accordance with an embodiment of the present invention;

FIG. 19 is a block diagram of an automated hub finishing apparatus in accordance with an embodiment of the present invention;

FIG. 20 is a flowchart of step S4 of the hub manufacturing method in an embodiment of the present invention.

Reference numerals:

An automated spoke production apparatus 20; an aluminum liquid heat preservation device 21; insert-delivery device 22; a vibration conveying mechanism 221; a vibration plate 2211; a material channel 2212; a stage 2213; a pre-positioning mechanism 222; insert station 2221; a positioning detection mechanism 223; insert positioning sensor 2231; an insert transfer mechanism 224; a single piece grip 2241; a first servo module 2242; a charging die casting device 23; an automatic feeder 231; a scoop 2311; a link mechanism 2312; a rotation mechanism 2313; a die casting machine 232; a spray cooling device 24; a work transfer device 25; a multi-axis mechanical arm 251; a rotation shaft 2511; a grasping mechanism 252; insert grip 2521; a gripping mechanism 253; a movable clamp plate 2531; the spoke production industrial control unit 26; a vibration indication sensor 261; an automated rim production apparatus 30; a steel ring manufacturing device 31; a coil winder 311; a straight line welder 312; a rotary cutter 313; a rim processing device 32; a rounding machine 321; a spinning machine 322; an expander 323; a shaper 324; a weld detecting apparatus 33; automatically positioning the punching device 34; an automatic color recognition locator 341; valve core Kong Chongchuang; a rim transfer device 35; a horizontal movement mechanism 351; a guide rail 3511; pick-and-place mechanism 352; rim grippers 3521; a second servo module 3522; the rim production industrial control unit 36; an automatic pressure welding device 40; a welding pre-positioning device 41; a turntable 411 for welding; a welding rotation mechanism 412; a welding station 413; a press-fit welding device 42; a hydraulic cylinder 421; a welding gun 422; a welding robot 423; a rim placement device 43; a finished product transfer device 44; a pressure welding detection device 45; an optical detector 451; a pressure detection machine 452; the pressure welding industrial control unit 46; an automatic hub finishing apparatus 50; a housing 501; a sliding window 502; hub rotation means 51; a main rotation shaft 511; a rotation driving mechanism 512; a finishing device 52; a milling cutter 521; punching a knife set 522; a turning cutter group 523; a knife pack drive mechanism 524; hub cooling means 53; hub finishing control 54; an insert 100; a connection part 101; a fixing portion 102; a through hole 1021; a mold 200; a lower die 201; a mold cavity 202; an insert placement location 2021;

Detailed Description

In order to make the technical means, creation features, achievement of the purposes and effects of the present invention easy to understand, the manufacturing method of the hub of the present invention is specifically described below with reference to the embodiments and the accompanying drawings.

< Example >

The embodiment provides a hub manufacturing method.

FIG. 1 is a flow chart of a method of manufacturing a hub in accordance with an embodiment of the present invention.

As shown in fig. 1, the manufacturing method of the hub of the present embodiment specifically includes the following steps:

Step S1, using aluminum liquid as a raw material, and preparing the spoke by a die casting method.

In this example, the spokes were automatically produced by an automated spoke production apparatus using an aluminum liquid as a raw material. The structure and working principle of the automatic spoke production equipment will be described first, and then the manufacturing steps of the spoke will be described.

Fig. 2 is a block diagram of an automated spoke manufacturing apparatus in accordance with an embodiment of the present invention.

Fig. 3 is a schematic structural view of an automated spoke manufacturing apparatus in an embodiment of the invention.

As shown in fig. 2 and 3, the automated spoke production apparatus 20 of the present embodiment includes an aluminum liquid heat preservation device 21, an insert conveying device 22, a charging die casting device 23, a spray cooling device 24, a workpiece transfer device 25, and a spoke production industrial control unit 26.

The aluminum liquid heat preservation device 21 detects the temperature of the raw material aluminum liquid in real time, and heats the aluminum liquid based on the detected temperature, so that the aluminum liquid is kept in a molten state for subsequent processing, and in this embodiment, the aluminum liquid heat preservation device 21 keeps the aluminum liquid at 650-750 ℃.

The insert-conveying apparatus 22 is used for arranging a plurality of inserts according to a predetermined rule for subsequent processing. In this embodiment, the spoke produced has a plurality of spokes, the ends of which have inserts of steel material, which are subsequently welded to the rim by means of the plurality of inserts.

Fig. 4 is a block diagram of an insert in an embodiment of the invention.

As shown in fig. 4, the insert 100 has a connecting portion 101 for welding with the inner surface of the rim, and a fixing portion 102 for fixing the insert 100 to the end of the spoke. The fixing portion 102 is provided with a plurality of through holes 1021. The function of the through-hole 1021 will be described in further detail below in connection with the corresponding manufacturing steps.

Fig. 5 is a schematic structural view of an insert-conveying apparatus according to an embodiment of the present invention.

As shown in fig. 5, the insert-conveying apparatus 22 includes a vibrating conveying mechanism 221, a pre-positioning mechanism 222, a positioning detecting mechanism 223, and an insert-transferring mechanism 224.

The vibration conveying mechanism 221 aligns and outputs the plurality of unordered inserts 100 in a vibration manner. The vibratory conveying mechanism 221 includes a vibratory tray 2211, a material path 2212, and a stage 2213. One section of the material path 2212 is connected to the output end of the vibration plate 2211, and the other end is connected to the mounting table 2213. Meanwhile, a vibration indication sensor 261 for sensing the insert-transferring mechanism 224 passing through the position is further provided at one side of the stage 2213. In this embodiment, the vibration indicating sensor 261 is a photo sensor that generates a corresponding signal once the insert transfer mechanism 224 passes through the corresponding location.

The pre-positioning mechanism 222 has a plurality of insert stations 2221 arranged in accordance with a predetermined rule, and the shape of the insert stations 2221 matches the shape of the insert 100.

The positioning detecting mechanism 223 has a plurality of insert positioning sensors 2231 arranged in accordance with a predetermined rule for detecting the arrangement of the plurality of inserts 100 grasped by the workpiece transferring device 25. In this embodiment, the insert positioning sensor 2231 is a micro switch that generates a corresponding signal once the trigger reed of the micro switch is depressed.

The insert-transfer mechanism 224 grabs the insert 100 and places a plurality of inserts 100 onto respective insert stations 1221. The insert transfer mechanism 224 has a single piece grip 2241 that mates with the through bore 1021 and a first servo module 2242, thereby gripping the insert 100 and moving the insert 100 and placing the insert 100 onto the insert station 2221. Specifically, the single grip 2241 has two gripping ends (not shown) capable of passing through the two through holes 1021 of the insert 100 and opening to both sides, respectively, to grip one insert 100. The first servo module 2242 is an L-shaped servo module, and can move along four directions of horizontal and vertical directions, so as to drive the single gripper 2241 on the end part to move. Meanwhile, in the present embodiment, the spoke manufacturing industrial control unit 26 stores therein a predetermined movement locus of the single grip 2241.

Under the control of the spoke manufacturing industrial control unit 26, the insert transferring mechanism 224 cooperates with the insert conveying device 22, the single-piece grip 2241 removes one insert 100 from the mounting table 2213, at this time, the vibration indication sensor 261 generates a corresponding signal, and after the spoke manufacturing industrial control unit 26 receives the signal, the vibration plate 2211 is controlled to start working and the next insert 100 is directionally output to the mounting table 2213.

Under the control of the spoke manufacturing industrial control unit 26, the insert transferring mechanism 224 also cooperates with the pre-positioning mechanism 222 to move the single-piece grip 2241 according to a predetermined movement track, so as to place the plurality of inserts 100 on the plurality of insert stations 2221 respectively.

The work transfer device 25 works in cooperation with the insert conveying device 22 and the charging die casting device 23 to grasp the plurality of inserts 100 and place the plurality of inserts 100 into the mold while maintaining the arrangement state of the plurality of inserts 100.

Fig. 6 is a structural view of a mold in which an insert is placed in the present embodiment.

Fig. 7 is an enlarged view of the portion of fig. 6 within the frame a.

As shown in fig. 6 and 7, in this embodiment, the mold 200 for producing spokes is a split mold, which has an upper mold (not shown) and a lower mold 201, wherein the upper mold and the lower mold 201 are separated to be opened, at this time, the insert 100 can be put in and the spoke semi-finished product can be taken out, and the upper mold and the lower mold 201 are closed to be closed, at this time, molten aluminum can be injected and die casting can be performed. In fig. 8, a lower mold 201 is shown, and it can be seen that the cavity 202 of the lower mold 201 has a portion corresponding to the spoke of the final product, and the end of the portion is a predetermined insert placement portion 2021, and in fig. 6, four inserts 100 are placed in the four insert placement portions 2021, respectively.

After placement of the insert 100 is completed, the mold may be closed for die casting.

The charging die casting device 23 includes an automatic charging machine 231 and a die casting machine 232.

Fig. 8 is a schematic view of the structure of the automatic feeder in this embodiment.

As shown in fig. 8, the automatic feeder 231 includes a ladle 2311, a link mechanism 2312, a rotating mechanism 2313 and two corresponding driving motors (not shown in the drawings), wherein the driving motors can drive the rotating mechanism 2313 and the link mechanism 2312 to drive the ladle 2311 arranged at the end of the link mechanism 2312 to move to the aluminum liquid heat preservation device 21 to hold aluminum liquid, and drive the ladle 2311 to move to the die casting machine 232 to turn over and pour the aluminum liquid.

As shown in fig. 3, the die casting machine 232 is a horizontal cold chamber die casting machine, and has a hydraulic cylinder, a pressing die, a shot chamber, and a shot punch (not shown in the figure), the hydraulic cylinder drives the pressing die to fold and press the die, the automatic feeder 231 pours the aluminum liquid into the shot chamber, the shot punch pushes the aluminum liquid in the shot chamber out at a predetermined pressure, the aluminum liquid is injected into a die cavity through a runner of the die, the aluminum liquid is solidified into a die casting part, that is, a spoke semi-finished product, after the pressure of the hydraulic cylinder and the shot punch is maintained for a period of time, the aluminum liquid in the runner is also solidified to form a handle on the spoke semi-finished product. The specific construction of the die casting machine 232 is prior art and will not be described in further detail.

Meanwhile, when die casting is performed, the aluminum liquid also wraps the fixing portions 102 of the inserts 100, and flows into the through holes 1021 on the fixing portions 102, and when die casting is completed, the solidified aluminum liquid wraps the fixing portions 102 and buckles the through holes 1021, and the solidified aluminum liquid is abutted against the connecting portions 101, so that the inserts 100 are correspondingly supported in directions facing and away from the center of the spoke, and have good structural strength.

As shown in fig. 4, the spray cooling device 24 of the present embodiment is a single-shaft automatic spray machine, and is capable of pressurizing and spraying the stored cooling liquid to form water mist, thereby cooling the spoke semi-finished product. The specific construction of the spray cooling device 24 is not described in detail in the prior art.

Fig. 9 is a schematic structural view of the work transfer device in the present embodiment.

As shown in fig. 9, the workpiece transfer apparatus 25 of the present embodiment includes a multi-axis robot 251, a gripping mechanism 252, and a gripping mechanism 253.

The gripping mechanism 252 is used to simultaneously grip a plurality of inserts 100 on a plurality of insert stations 2221. The grasping mechanism 252 has a plurality of insert grips 2521, and the plurality of insert grips 2521 are arranged in a predetermined rule. The structure and gripping manner of the insert grip 2521 are identical to those of the single grip 2241, and the description will not be repeated.

The clamping mechanism 253 is used for clamping the cooled spoke semi-finished product. The gripping mechanism 253 has two movable clamp plates 2531, and the shape of the two movable clamp plates 2531 is matched with the shape of the stem of the spoke semi-finished product, so that the stem can be gripped to take out the spoke semi-finished product, and the stem can be released to release the spoke semi-finished product at a predetermined position. The gripping mechanism 253 grips the handle to move the spoke semi-finished product without touching the portion of the final product, so that the gripping mechanism 253 can grip out the spoke semi-finished product without damaging the portion of the final product on the spoke semi-finished product.

The multi-axis mechanical arm 251 is used for driving the grabbing mechanism 252 and the clamping mechanism 253 to move, in this embodiment, the multi-axis mechanical arm 251 is a six-axis mechanical arm, and meanwhile, a predetermined movement track of the multi-axis mechanical arm 251 is stored in the spoke production industrial control unit 26.

The multi-axis robot 251 has a rotation shaft 2511 at the extreme end, and the grasping mechanism 252 and the gripping mechanism 253 are fixedly mounted on the rotation shaft 2511 and are disposed opposite to each other. The work transfer device 25 can rotate one of the gripping mechanism 252 and the gripping mechanism 253 in a predetermined direction by rotating the rotation shaft 2511 at the extreme end.

As shown in fig. 5 and 9, after the insert 100 is placed at the plurality of insert stations 2221, that is, after the insert transfer mechanism 224 completes a predetermined movement track, the spoke manufacturing industrial control unit 26 controls the workpiece transfer device 25 to simultaneously grasp the plurality of inserts 100, after the grasping is completed, further controls the workpiece transfer device 25 to move the plurality of inserts 100 to the positioning detection mechanism 223, so that the plurality of inserts 100 are respectively aligned with the plurality of insert positioning sensors 2231 and pressed down, and the spoke manufacturing industrial control unit 26 detects whether the plurality of inserts 100 grasped are arranged according to a predetermined rule, that is, whether the plurality of inserts 100 are missing or not, and further controls the workpiece transfer device 25 to place the plurality of inserts 100 in the plurality of insert placement positions 2021 in an arrangement state after detecting that the plurality of inserts 100 are arranged according to the predetermined rule.

After the die casting is completed, as shown in fig. 2, the spoke manufacturing industrial control unit 26 controls the workpiece transfer device 25 to move into the opened mold 200, clamps the stem of the spoke semi-finished product, and takes out the spoke semi-finished product to be placed at a predetermined next station.

FIG. 10 is a flowchart of step S1 of the hub manufacturing method in an embodiment of the present invention.

As shown in fig. 10, based on the above-mentioned automated spoke production apparatus 20, step S1 of the present embodiment specifically includes the following sub-steps:

step S1-1, a mold corresponding to the spoke is placed in a die casting machine.

And S1-2, respectively placing a plurality of inserts into a plurality of preset insert placement positions in the die.

In the present embodiment, the work transfer device 25 simultaneously grips the plurality of the inserts 100 from the plurality of the insert stations 2221, and places the plurality of the inserts 100 to the respective insert placement sites 2021, respectively.

And S1-3, injecting aluminum liquid into a die casting machine, and performing die casting molding through a die to obtain a spoke semi-finished product.

In this embodiment, the automatic feeder 231 takes molten aluminum from the molten aluminum heat preservation device 21 and pours the molten aluminum into the die casting machine 232, and the die casting machine 232 die-casts the molten aluminum through the die 200.

And S1-4, performing spray cooling on the spoke semi-finished product.

In this embodiment, the die-cast spoke semifinished product is spray-cooled by means of a spraying device 24.

And S1-5, cutting off a material handle of the spoke semi-finished product.

In this embodiment, the producer cuts the material handle by the corresponding tool.

And S1-6, polishing the spoke semi-finished product to obtain the spoke.

In the embodiment, production personnel place the spoke semi-manufactured goods after cutting the material handle on the lathe and polish, get rid of tiny sediment limit.

And S1-7, performing sand blasting on the spoke.

In this embodiment, the production personnel put into sand blasting unit with the spoke that polishes and carry out the sandblast, make the spoke have sandy surface, more pleasing to the eye.

As described above, through step S1 of the present embodiment, an aluminum alloy spoke having a plurality of inserts 100 is manufactured.

Step S2, preparing the rim by using the steel belt as a raw material.

In this embodiment, the rim described above is automatically produced by an automated rim production apparatus using a steel strip as a raw material. Similarly, the structure and operation of the automated rim production facility will be described first, and the rim manufacturing steps will be described later.

FIG. 11 is a block diagram of an automated rim production apparatus in accordance with an embodiment of the present invention.

FIG. 12 is a schematic view of an automated rim production apparatus in accordance with an embodiment of the present invention.

As shown in fig. 11 and 12, the automated rim production apparatus 30 of the present embodiment includes a rim manufacturing device 31, a rim processing device 32, a bead detecting device 33, an automatic positioning punching device 34, a rim transferring device 35, and a rim production industrial control unit 36.

The rim manufacturing apparatus 31 is for manufacturing a rim having a predetermined size, and the rim is further processed to obtain a rim. The steel ring manufacturing apparatus 31 includes a coil winding machine 311, a linear welding machine 312, and a rotary cutting machine 313. The coiler 311 coils the steel strip in a cylindrical shape in the width direction, and causes the two long sides of the steel strip to coincide. The straight line welder 312 welds a cylindrical steel strip and welds two long sides of the steel strip together. The rotary cutter 313 cuts the welded cylindrical steel strip by laser in a direction perpendicular to the longitudinal direction of the steel strip and a predetermined length to obtain a steel ring. The coiling machine 311, the linear welding machine 312 and the rotary cutter 313 are all prior art and will not be described in detail.

The rim processing device 32 is used for processing a structure corresponding to the tire mounting on the basis of the rim, and a rim semi-finished product is obtained. The rim processing device 32 includes a rounding machine 321, a spinning machine 322, an expanding machine 323, and a truing machine 324.

The rounding machine 321 is used for rounding the steel ring, and enlarges the steel ring by a certain size in a centrifugal way so as to facilitate subsequent processing and enable the steel ring to have better roundness. The rounding machine 321 is a vertical rounding machine in the prior art, and will not be described in detail.

The spinning machine 322 is used for spinning the steel ring after the rounding, so that the steel ring has a structure matched with the tire. The spinning machine 322 adopts a vertical spinning machine in the prior art, and will not be described in detail.

The expander 323 is used for expanding and sizing the steel ring with the corresponding structure after rotation to expand the steel ring to a calibrated size, so that the diameter of the formed rim meets the size requirement. An expansion die with a calibrated size is placed in the expander 323, and the expander 323 rotationally presses the steel ring to the calibrated size through the expansion die. The expander 323 is a vertical rim expander of the prior art and will not be described in detail.

The truing machine 324 trues the expanded rim with its edge towards the inner rim so that the rim can better grip the tire after shaping. The truing machine 324 is a vertical rim truing machine of the prior art and will not be described in detail.

Fig. 13 is a schematic diagram showing structural changes of the steel ring in the embodiment of the invention.

After the steel rings (i.e., the semi-finished rim) are processed by the above-mentioned respective devices, the structures thereof are shown in fig. 13 (a) to 13 (f), respectively. Fig. 13 (a) is a schematic structural view of a steel band coil, fig. 13 (b) is a schematic structural view of a steel band with welded ends, fig. 13 (c) is a schematic structural view of a steel band with expanded circles, fig. 13 (d) is a schematic structural view of a steel band with spun circles, fig. 13 (e) is a schematic structural view of a steel band with expanded circles, and fig. 13 (f) is a schematic structural view of a steel band with shaped circles.

The weld detecting device 33 is used for detecting the pressure of the weld joint on the semi-finished rim product, and detecting whether the weld joint has a leakage part or not, thereby ensuring the structural strength of the finished rim product. The weld detection apparatus 33 employs an automatic pressure leak detector of the prior art, and will not be described in detail.

The automatic positioning and punching device 34 is used for automatically positioning the welding seam on the rim semi-finished product and punching the valve core hole at a position other than the welding seam. The automatic positioning and punching device 34 comprises an automatic color recognition positioning machine 341 and a valve core Kong Chongchuang 342, wherein the automatic color recognition positioning machine 341 recognizes a welding seam on the semi-finished rim product according to the color and rotates the semi-finished rim product by a preset angle after recognizing and positioning the welding seam, so that punching of a valve core hole on the welding seam is avoided; the valve core Kong Chongchuang is punched with a valve core hole having a predetermined size on the rim semifinished product. The automatic color recognition positioner 341 and the valve core Kong Chongchuang are well known in the art and will not be described in detail.

The rim transfer device 35 includes a horizontal movement mechanism 351 and a plurality of pick-and-place member mechanisms 352.

The horizontal movement mechanism 351 is configured to horizontally move the pick-and-place mechanism 352.

The pick-and-place member mechanism 352 is movably mounted on the guide rail 3511 so as to be horizontally movable in the extending direction of the guide rail 3511. The pick-and-place mechanism 352 includes a rim grip 3521 and a second servo module 3522. The rim grip 3521 is provided at an end of the second servo module 3522, and the rim grip 3521 has two jaws matching the shape of the rim, thus being capable of gripping the rim. The second servo module 3522 is an L-shaped servo module, and thus can move along four directions, i.e., horizontal and vertical directions, and drive the rim gripper 3521 at the end to move.

In this embodiment, a steel ring mounting table 311, a rounding machine 321, a spinning machine 322, a rounding machine 323, a shaping machine 324, a welding seam detection device 33, and an automatic positioning punching device 34 are sequentially provided along the extending direction of the guide rail 3511. A corresponding pick-and-place mechanism 352 is disposed between each of the two devices/machines, and the pick-and-place mechanism 352 is controlled by the rim production industrial personal computer 36 to pick the processed semi-finished rim product from the previous device/machine and place the semi-finished rim product into the next device/machine.

FIG. 14 is a flowchart of step S2 of the hub manufacturing method in an embodiment of the present invention.

As shown in fig. 14, based on the above-described automated rim production apparatus 30, step S2 of the present embodiment specifically includes the steps of:

And S2-1, coiling, end welding and fixed-length cutting are carried out on the steel belt, so as to obtain the steel ring with the welded joint.

In this embodiment, the coiled steel strip is coiled by a coiling machine 311, the coiled steel strip is welded into a whole by a linear welding machine 312, and the welded steel strip is cut to length by a rotary cutter 313, so as to obtain a steel ring with a predetermined size.

And S2-2, rounding the steel ring.

In this embodiment, the steel ring is rounded by a rounding machine 321.

And S2-3, spinning the expanded steel ring to enable the steel ring to have a structure matched with the tire.

In this embodiment, the expanded steel ring is spun by a spinning machine 322.

And S2-4, expanding the spun steel ring to a calibrated size.

In this embodiment, the spun rim is expanded to a nominal size by an expander 323.

And S2-5, shaping the expanded steel ring.

In this embodiment, the expanded steel ring is shaped by the shaper 324.

And S2-5a, performing pressure detection on the welding seam.

In this embodiment, the weld is pressure-detected by the weld detecting apparatus 33.

And S2-5b, positioning the welding seam.

In this embodiment, the automatic color recognition positioning machine 341 is used to position the welding seam on the steel ring, and after the welding seam is recognized, the steel ring is rotated by a predetermined angle, so that the impact of the opening of the valve core hole on the structural strength at the welding seam is avoided.

And S2-6, opening a valve core hole at a position except for the welding joint on the shaped steel ring to obtain the rim.

In this embodiment, a valve core hole is punched in the steel ring through valve core Kong Chongchuang 342.

As described above, the rim made of steel was prepared by step S2 of the present example. Meanwhile, step S1 and step S2 have no dependency, and thus may be performed simultaneously.

And S3, welding the spoke and the rim to obtain a hub semi-finished product.

In this embodiment, the prepared spokes and rim are welded into an integrated hub by an automated press welding apparatus.

Fig. 15 is a block diagram of an automated bonding apparatus in accordance with an embodiment of the present invention.

Fig. 16 is a schematic structural view of an automated bonding apparatus according to an embodiment of the present invention.

As shown in fig. 15 and 16, the automated bonding apparatus 40 of the present embodiment includes a bonding pre-positioning device 41, a press-fit bonding device 42, a rim placement device 43, a finished product transfer device 44, a bonding detection device 45, and a bonding industrial control unit 46.

The welding pre-positioning device 41 is used for placing the prepared spoke and rim according to a preset rule so as to perform press fit and welding. The welding positioning device 41 includes a welding turntable 411, a welding rotating mechanism 412, and a plurality of welding stations 413.

The welding turntable 411 is used for placing a plurality of welding stations 413 and rotating the welding stations 413 to corresponding devices. The welding rotation mechanism 412 is connected to the welding turntable 411, and drives the welding turntable 411 to turn in the horizontal direction. A plurality of welding stations 413 are distributed on the welding turntable 411 according to a predetermined arrangement rule for carrying spokes to be welded, a rim and a welded hub. Meanwhile, in this embodiment, a spoke sensor and a spoke sensor are disposed on the welding station 413, and are disposed on the welding station 413 corresponding to the positions where the spoke and the rim are disposed, respectively, where the spoke sensor and the spoke sensor are pressure sensors, and generate corresponding signals when sensing pressure.

The press-fit welding device 42 is used to sequentially weld the plurality of inserts 100 to the inner surface of the rim. The press-fit welding device 42 comprises a hydraulic cylinder 421, a plurality of welding guns 422 and a plurality of welding mechanical arms 423, wherein the welding guns 422 respectively correspond to the inserts 100 and are respectively arranged at the end parts of the welding mechanical arms 423, the hydraulic cylinder 421 compacts spokes and rims, the welding mechanical arms 423 drive the welding guns 422 to move downwards to the corresponding inserts 100 for welding, and after the welding is completed, the welding mechanical arms 423 drive the welding guns 422 to move upwards, so that the welded hub semi-finished product is taken out conveniently. The automatic press-fit welding device 42 is an automatic press-fit welding machine of the related art, and will not be described in detail.

The rim placement device 43 is used to place the prepared rim onto the welding station 413 where the spokes have been placed and nest with the outer ring of the spokes. The structure and operation of the rim placement device 43 are identical to those of the rim transfer device 35 described above, and the description thereof will not be repeated. Meanwhile, in the present embodiment, the rim placing device 43 is provided in the vicinity of the automatic positioning and punching device 34, so that the processed rim can be grasped from the automatic positioning and punching device 34 and placed on the welding station 413.

The finished product transfer device 44 is used to grasp and transfer the press-welded hub semi-finished product to a predetermined placement location. The construction and operation of the final product transfer device 44 is identical to that of the workpiece transfer device 25 described above, and the description thereof will not be repeated.

The bonding inspection device 45 includes an optical inspection machine 451 and a pressure inspection machine 452. The optical detector 451 is used for optically detecting the welding parts, when the detected brightness is greater than a predetermined threshold value, the corresponding welding parts are judged to be missed welding, and meanwhile, the optical detector 451 can also display the enlarged optical images of the welding parts, so that the inspection by production personnel is facilitated. The pressure detecting machine 452 applies pressure to a plurality of welding parts simultaneously according to predetermined parameters, detects stress conditions of the welding parts, and determines that the corresponding welding parts are cold welds when the detected stress conditions deviate greatly from a predetermined stress curve. The optical inspection machine 451 and the pressure inspection machine 452 are well known in the art and will not be described in detail.

The press-welding process is controlled by the press-welding industrial control unit 46, after signals sent by spoke inductors and/or spoke inductors are received, the welding rotary mechanism 412 is controlled to drive the welding rotary table 411 to rotate by a preset angle, the rim placing device 43 is controlled to nest the rim on the outer ring of the spoke, the automatic press-fit welding device 42 is further controlled to weld the plurality of inserts 100 on the inner surface of the rim, after press-fit is finished, the welding rotary mechanism 412 is further controlled to drive the welding rotary table 411 to rotate by a preset angle, the finished product transferring device 44 is controlled to grasp the hub semi-finished product after press-welding is finished, and the hub semi-finished product is transferred to a preset placing position.

FIG. 17 is a flowchart of step S3 of the hub manufacturing method in an embodiment of the present invention.

As shown in fig. 17, based on the automatic pressure welding apparatus 40 described above, step S3 of the present embodiment specifically includes the steps of:

and step S3-1, placing the spoke on a preset welding station.

In this embodiment, the manufacturer transports the spokes prepared as described above to the vicinity of the welding positioning device 41 and places the spokes on the welding station 413. At this time, the spoke sensor senses the weight of the spoke and generates a corresponding signal, and the pressure welding industrial control unit 46 controls the turntable 411 to rotate by a predetermined angle, so that the station 413 on which the spoke is mounted rotates to a predetermined working position of the rim placement device 43.

And S3-2, nesting the rim on the outer ring of the spoke.

In this embodiment, the rim placement device 43 places the rim on the spoke-carrying station 413 and nests the rim on the outer ring of the spoke for welding.

And step S3-3, welding a plurality of inserts on the inner surface of the rim through a press welder to obtain a hub semi-finished product.

In this embodiment, a plurality of inserts 100 on the spokes are welded to the inner surface of the rim by press fit welding means 42 to form an integrated hub blank.

And S3-4, performing optical detection and pressure detection on a plurality of welding positions of the hub semi-finished product.

In this embodiment, the optical inspection machine 451 is used to optically inspect a plurality of welding portions, so that missing welding is avoided, and the pressure inspection machine 452 is used to detect pressure on a plurality of welding portions, so that false welding is avoided.

As described above, through step S3 of the present embodiment, an integrated hub semi-finished product is prepared.

And S4, carrying out finish machining on the hub semi-finished product to obtain the hub.

In this embodiment, the prepared hub semi-finished product is further finished by an automatic hub finishing device.

Fig. 18 is a block diagram of an automatic hub finishing apparatus in this embodiment.

Fig. 19 is a structural view of an automatic hub finishing apparatus in the present embodiment.

As shown in fig. 18 and 19, the automatic hub finishing apparatus 50 of the present embodiment includes a housing 501, a slide window 502, a hub rotating device 51, a finishing device 52, a hub cooling device 53, and a hub finishing control device 54.

The sliding window 502 can slide to one side, so that a producer can put a semi-finished hub to be processed into the hub and take out the processed hub conveniently, and finish machining can be started when the sliding window 502 slides to the other side to a closed position.

The hub rotation device 51 is used for rotating the hub semi-finished product at a high speed for performing machining such as milling. The hub rotating device 51 comprises a main rotating shaft 511 and a rotating driving mechanism 512, and when finishing is carried out, a hub semi-finished product is fixedly arranged on the end part of the main rotating shaft 511, and the rotating driving mechanism 512 drives the main rotating shaft 511 to rotate at a high speed and drives the hub semi-finished product to rotate at a high speed.

The finishing device 52 is used for milling, punching and turning the hub semi-finished product. The finishing device 52 includes a milling cutter 521, a punching cutter set 522, a turning cutter set 523, and a cutter set driving mechanism 524.

The milling cutter 521 is used for milling the surface of the hub semi-finished product to make the outer edge smooth.

The punch blade set 522 has a plurality of punch blades of predetermined size for punching a center hole and a plurality of bolt holes in the spokes of the hub blank.

The turning tool group 523 has a plurality of turning tools of predetermined shapes and sizes for turning inner end surfaces of the punched central holes and the plurality of bolt holes, and corresponding female threads are formed at the inner end surfaces thereof, respectively.

The cutter set driving mechanism 524 is connected to the milling cutter 521, the punching cutter set 522, and the turning cutter set 523, respectively, and drives the respective cutters/cutter sets to move to predetermined positions.

The hub cooling device 53 spray-cools the finished hub semi-finished product.

The hub finishing control device 54 controls the hub finishing process, controls the hub rotating device 51 to accelerate and rotate the hub semi-finished product to a preset rotating speed according to a preset working procedure, then sequentially controls the milling cutter 521 to mill a plane on the hub semi-finished product through the cutter set driving mechanism 524, controls the punching cutter set 522 to punch a center hole and a threaded hole in the spoke part, controls the turning cutter set 523 to turn corresponding internal threads on the inner end surfaces of the punched center hole and the threaded hole, and finally controls the hub cooling device 53 to spray cool the processed hub semi-finished product.

After finishing the finish machining, the production personnel take out the hub semi-finished product, transfer the hub semi-finished product into electrophoresis equipment for electrophoresis painting, and obtain a final hub product.

As shown in fig. 20, based on the automatic hub finishing apparatus 50 described above, step S4 of the present embodiment specifically includes the following sub-steps:

and S4-1, milling the plane of the hub semi-finished product.

And S4-2, punching a center hole and a bolt hole on the spoke of the hub semi-finished product.

And S4-3, respectively turning the inner end surfaces of the central hole and the bolt hole to form corresponding internal threads.

And S4-4, performing electrophoretic painting on the hub semi-finished product to obtain the hub.

And S4-5, detecting the hub.

In this embodiment, the manufacturer detects the hub according to the calibration size and other predetermined requirements, and separates acceptable and unacceptable hub products. The qualified hub products can be further packaged and delivered out of stock.

As described above, with the hub manufacturing method of the present embodiment, the spokes and the rim are prepared separately, and then the spokes are welded to the inner surface of the rim through the plurality of inserts 100 to obtain the hub semi-finished product, and then the hub semi-finished product is finished and painted to obtain the final hub product.

Example operation and Effect

According to the hub manufacturing method provided by the embodiment, the hub manufacturing method comprises four steps of preparing a spoke with an insert 100, preparing a rim, welding the spoke to the rim through the insert 100 to obtain a hub semi-finished product, and finishing the hub semi-finished product. The wheel spoke is manufactured by using aluminum liquid as a raw material through a die casting method, a wheel rim is manufactured by using a steel belt as the raw material, the wheel spoke is welded to the wheel rim through a plurality of inserts 100, an integrated hub semi-finished product is formed, and the hub semi-finished product is subjected to finish machining, so that a final hub product is obtained. The spoke and the rim are prepared without dependence and can be simultaneously performed, so that the production efficiency is greatly improved; because a plurality of inserts 100 which are the same as the rim material are adopted as connecting pieces for welding, the spokes and the rim can be made of different materials, the spokes are made of aluminum alloy materials, and the rim and the inserts are made of steel materials, so that the structural strength is ensured and the cost is reduced.

Specifically, the production of the spoke comprises six steps of insert placement, die casting, spray cooling, material handle removal and polishing. The workpiece transferring device 25 respectively places a plurality of inserts 100 at the predetermined insert placement positions 2021 in the die 200, then the automatic feeder 231 injects aluminum liquid into the die casting machine 232 and performs die casting to obtain a spoke semi-finished product with the inserts 100, after the spoke semi-finished product is sprayed and cooled by the spraying device 26, the solidified aluminum liquid wraps the fixing portions 102 of the inserts 100 and buckles the plurality of through holes 1021, and meanwhile the solidified aluminum liquid is abutted against the connecting portions 101, so that the inserts 100 are correspondingly supported in the directions facing and away from the center of the spoke, and the inserts 100 and the aluminum alloy portions have good connection strength. And then, the production personnel remove the material handle of the spoke semi-finished product through corresponding tools and devices, and polish the material handle to be smooth, so as to obtain the spoke finished product.

Further, the production of the rim comprises six steps of preparing a steel ring, rounding, spinning, expanding, shaping and forming a valve core hole. The rim manufacturing device 31 is used for welding and cutting the ends of a raw material steel belt coil to a fixed length to obtain a rim corresponding to a rim, the round expanding machine 321 is used for expanding the rim by a certain size so as to facilitate processing and enable the rim to have better roundness, the spinning machine 322 is used for spinning out a structure matched with a tire on the rim, the round expanding machine 323 is used for expanding the rim to a calibrated size through an expansion die, the shaping machine 324 is used for shaping the rim so as to enable the rim to be curled inwards, the tire can be better buckled, the welding seam detection device 33 is used for detecting the pressure of a welding seam on the rim and detecting whether a gas leakage part exists or not, so that the structural strength of a rim finished product is ensured, the automatic positioning punching device 34 is used for automatically positioning the welding seam on the rim through color recognition, and punching a valve core hole is arranged at a position beyond the welding seam, so that the influence of the structural strength of a valve core Kong Duijie is reduced. Also in the present embodiment, the above-described devices/working machines are disposed in order along the extending direction of the guide rail 3511 of the rim transferring device 35, so that the plurality of pick-and-place mechanism 352 provided on the guide rail 3511 can take out the finished rim semifinished product from the former device/working machine and place the rim semifinished product into the latter device/working machine.

Further, the plurality of inserts 100 are sequentially welded to the inner surface of the rim by the automatic pressure welding equipment 40, a hub semi-finished product is obtained, and after the pressure welding is completed, the welding positions are subjected to optical detection and pressure detection by the welding detection device 45, so that the condition that the welding is missed or the false welding exists in the welding positions is avoided, and the structural strength of the hub is ensured.

Further, the hub semi-finished product is milled, punched and turned by the automatic hub finishing apparatus 50 to obtain a hub having a smooth outer edge and having a center hole and a plurality of bolt holes conforming to predetermined requirements, thereby enabling the hub to be coupled and mounted to an axle.

The above examples are only for illustrating the specific embodiments of the present invention, and the present invention is not limited to the description scope of the above examples.

In the above-described embodiment, the rim is produced using the steel strip as the raw material, and in other aspects of the present invention, the rim may be produced using a steel strip roll, which is more convenient to transport and store, and accordingly, the automated rim production apparatus 30 may further include a steel strip flattening device for flattening the steel strip roll to obtain a flattened steel strip.

In the above embodiment, the whole steel strip is coiled, two ends (i.e., two long sides of the steel strip) are welded together after coiling to form a cylinder, and then fixed-length cutting is performed to obtain the steel ring.

Claims

1. A method of manufacturing a hub including a rim for mounting a tire and a spoke for supporting the rim, comprising:

step S1, preparing the spoke by using aluminum liquid as a raw material through a die casting method;

step S2, preparing the rim by using a steel belt as a raw material;

S3, welding the spoke and the rim to obtain a hub semi-finished product;

Step S4, carrying out finish machining on the hub semi-finished product to obtain the hub,

Wherein the spoke is provided with a plurality of spokes,

The ends of the spokes have an insert,

The web is welded to the rim by a plurality of the inserts,

Step S1 comprises the following sub-steps:

s1-1, putting a die corresponding to the spoke into a die casting machine;

S1-2, arranging a plurality of inserts required for manufacturing one hub according to a preset rule, and respectively placing the arranged inserts at a plurality of preset insert placement positions in a die;

S1-3, injecting the aluminum liquid into the die casting machine and die casting and forming through the die to obtain a spoke semi-finished product,

Wherein in step S1-2, a plurality of inserts are arranged according to the preset rule by an insert conveying device, and the arranged inserts are put into the die by a workpiece transferring device,

The insert-conveying apparatus includes:

The vibration conveying mechanism is used for orderly arranging a plurality of unordered inserts in a vibration mode and outputting the ordered inserts to the carrying table;

The pre-positioning mechanism is provided with a plurality of insert stations which are arranged according to the pre-determined rule, and the shape of each insert station is matched with that of the insert for placing the insert; and

An insert transfer mechanism for gripping the inserts on the mounting table and placing a plurality of the inserts on each of the insert stations,

The workpiece transfer device simultaneously grabs a plurality of arranged inserts from a plurality of insert work stations, and keeps the arrangement state of the inserts to place the inserts at a plurality of insert placement positions in the die.

2. The hub manufacturing method according to claim 1, wherein:

Wherein, step S1 further comprises the following sub-steps:

s1-4, performing spray cooling on the spoke semi-finished product;

s1-5, cutting off a material handle of the spoke semi-finished product;

and S1-6, polishing the spoke semi-finished product to obtain the spoke.

3. The hub manufacturing method according to claim 2, wherein:

wherein the mould is a split mould,

The material of the insert is the same as that of the rim,

The insert placement portions are arranged according to a predetermined rule.

4. The hub manufacturing method according to claim 2, wherein:

step S1 further comprises step S1-7, wherein the spoke is subjected to sand blasting.

5. The hub manufacturing method according to claim 1, wherein:

wherein, step S2 comprises the following sub-steps:

s2-1, coiling, end welding and fixed-length cutting are carried out on the steel belt, so as to obtain a steel ring with a welded joint;

S2-2, rounding the steel ring;

s2-3, spinning the steel ring after rounding to enable the steel ring to have a structure matched with a tire;

s2-4, expanding the spun steel ring to a calibrated size;

S2-5, shaping the expanded steel ring;

and S2-6, forming a valve core hole on the shaped steel ring to obtain the rim.

6. The hub manufacturing method according to claim 5, wherein:

wherein, before step S2-6, further comprises:

S2-5a, performing pressure leak detection on the welded joint; and

Step S2-5b, positioning the welding joint,

In step S2-6, the valve core Kong Kaishe is located on the steel ring at a position other than the weld joint.

7. The hub manufacturing method according to claim 1, wherein:

wherein, step S3 comprises the following sub-steps:

S3-1, placing the spoke on a preset welding station;

s3-2, nesting the rim on the outer ring of the spoke;

And step S3-3, welding a plurality of inserts on the inner surface of the rim in a pressure welding mode to obtain the hub semi-finished product.

8. The hub manufacturing method according to claim 6, wherein:

Wherein, after the step S3-3, the method also comprises the step S3-4 of carrying out optical detection and pressure detection on a plurality of welding parts of the hub semi-finished product,

The optical inspection is used to detect whether there is a missing solder in the plurality of solder joints,

The pressure detection is used for detecting whether the plurality of welding parts have the cold joint.

9. The hub manufacturing method according to claim 1, wherein:

wherein, the step S4 comprises the following substeps:

s4-1, milling a plane on the hub semi-finished product;

s4-2, punching a center hole and a bolt hole on the spoke of the hub semi-finished product;

S4-3, turning inner end surfaces of the central hole and the bolt hole respectively to form corresponding internal threads;

And S4-4, carrying out electrophoretic painting on the hub semi-finished product to obtain the hub.

10. The hub manufacturing method according to claim 9, wherein:

step S4 further comprises step S4-5, wherein the hub is detected.