CN113787304A

CN113787304A - Machining process and precise machining equipment for high-strength hub

Info

Publication number: CN113787304A
Application number: CN202110975729.0A
Authority: CN
Inventors: 陈静; 黄国平; 周国涛
Original assignee: Zhejiang Boda Industry And Trade Co ltd
Current assignee: Zhejiang Boda Industry And Trade Co ltd
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2021-12-14

Abstract

The invention provides a processing technology of a high-strength hub and precision processing equipment thereof, belonging to the technical field of hub production. The hub machining process solves the problem that the existing hub machining process has a plurality of defects. The processing technology of the high-strength hub comprises the following steps: putting an aluminum ingot into a smelting furnace, controlling the temperature at 800-850 ℃, and smelting for 25-30 minutes to obtain a molten liquid, wherein the aluminum ingot comprises the following components: 0.70-0.80% of silicon, 0.90-1.00% of magnesium, 0.20-0.25% of copper, 0.20-0.25% of iron, 0.05-0.10% of zinc, 0.05-0.10% of manganese, 0.04-0.06% of titanium, 0.15-0.18% of chromium, and the balance of aluminum. Compared with the prior art, this high strength wheel hub's processing form is unique, and the equipment that adopts can solve diversified problem, can process out intensity, the higher wheel hub of precision.

Description

Machining process and precise machining equipment for high-strength hub

Technical Field

The invention belongs to the technical field of hub production, and relates to a processing technology of a high-strength hub and precision processing equipment thereof.

Background

The hub is a rotating part of a wheel core, wherein the wheel core is connected with the inner profile steel of the tire through a stand column, namely a metal part which supports the center of the tire and is arranged on a shaft. In the prior art, a plurality of defects still exist in the processing process of the hub, and the problems of low efficiency, high cost, incomplete equipment functionality and the like are mainly reflected.

Disclosure of Invention

The invention aims to provide a processing technology of a high-strength hub and precision processing equipment thereof, aiming at the problems of various defects of the existing hub processing technology.

The purpose of the invention can be realized by the following technical scheme:

a processing technology of a high-strength hub is characterized by comprising the following steps:

step 1: putting an aluminum ingot into a smelting furnace, controlling the temperature at 800-850 ℃, and smelting for 25-30 minutes to obtain a molten liquid, wherein the aluminum ingot comprises the following components: 0.70-0.80% of silicon, 0.90-1.00% of magnesium, 0.20-0.25% of copper, 0.20-0.25% of iron, 0.05-0.10% of zinc, 0.05-0.10% of manganese, 0.04-0.06% of titanium, 0.15-0.18% of chromium, and the balance of aluminum;

step 2: adding a filtering agent into the molten liquid, wherein the ratio of the filtering agent to the molten liquid is 1: 2500-1: 3000, controlling the temperature at 550-600 ℃, filtering filter residues by a standing method after keeping for 4-5 hours, and injecting the filtering agent into the molten liquid by adopting gas pressure injection;

and step 3: pouring the molten liquid into a mould to be cast into a blank, and performing heat treatment on the blank after detecting defects by rays;

and 4, step 4: clamping the blank on a clamp, then placing the blank on a station positioning device for positioning, and performing drilling and polishing processes after the positioning is finished to obtain a rough part;

and 5: performing air tightness detection on the rough part through an air tightness detection device;

step 6: carrying out a paint spraying process on the rough part by using a spraying device, and then carrying out paint baking and cooling;

and 7: carrying out fine machining on the rough part to obtain a finished product material;

and 8: and packaging the plurality of finished products by a stacking and packaging device to be delivered.

In the above-mentioned precision machining equipment for high-strength wheel hubs, the spraying device in step 6 includes a conveying platform, a fixture component arranged on the conveying platform in a sliding manner through a transverse screw rod, two sets of supports arranged on two sides of the conveying platform by a fixing frame, two paint spraying elements arranged on the two sets of supports in a vertical sliding manner through a vertical screw rod, two spray heads are arranged on the two paint spraying elements in an opposite manner, a driving wheel is fixedly arranged above each of the two vertical screw rods, the two driving wheels are tightly connected through a belt, a vertical driving element used for driving one of the vertical screw rods to rotate is fixedly arranged on each of the supports, and a transverse driving element used for driving the transverse screw rod to rotate is fixedly arranged on the conveying platform.

In the above precision machining device for a high-strength wheel hub, the clamp part includes a hollow bottom frame, two sets of positioning blocks, and two sets of lifting blocks, the lifting blocks are provided with a spindle for butting with the center of the wheel hub and a spindle driving element for driving the spindle to rotate, the two sets of positioning blocks are oppositely arranged and provided with a gap for accommodating the wheel hub, the upper surface of the bottom frame is oppositely provided with a linear positioning chute, the bottom of the positioning block is fixedly provided with a linear positioning slider, the two sets of positioning blocks are oppositely slidably arranged in the linear positioning chute through the linear positioning slider, the bottom frame is further provided with two sets of vertical frames, the vertical frames are provided with lifting chutes, the lifting blocks are slidably arranged in the lifting chutes, the lifting chutes are further vertically rotatably provided with adjusting screw rods, the lifting blocks are in threaded connection with the adjusting screw rods, the hollow part of the bottom frame is transversely provided with a bidirectional screw rod in a rotating manner, the two linear positioning sliding blocks are respectively connected to the two sides of the bidirectional screw rod in a threaded mode, and the two sides of the bidirectional screw rod are respectively provided with a positive thread and a negative thread.

In foretell high strength wheel hub's precision finishing equipment, accommodate the lead screw's bottom extends to the base below and fixed being equipped with one from the driving wheel, the fixed adjusting drive element that is equipped with in below of chassis, adjusting drive element's output shaft tip is equipped with the action wheel, action wheel and two from the driving wheel pass through the connecting band tight connection, a straight flute has still been seted up to the chassis below, the straight flute slides and is equipped with the tight piece that tightens, be equipped with a tight elastic component between tight piece and the straight flute, free rotation is equipped with a tight wheel on the tight piece, the tight wheel that tightens pastes on the connecting band from inside to outside.

In the precision machining equipment for the high-strength hub, the stacking and packaging device in the step 8 comprises a packaging frame, a conveying line for conveying the packaging frame, and a mechanical arm assembly for loading the hub onto the conveying line; the conveying line adopts an automatic stagnation driving assembly to complete stepping and stagnation periodic operation, the automatic stagnation driving assembly comprises a driving support, a stagnation driving element fixedly arranged on the driving support, a first half-toothed disc fixedly arranged on the stagnation driving element, a transmission shaft and an output shaft rotatably arranged on the driving support, a first toothed disc and a second half-toothed disc are fixedly arranged at the front end and the rear end of the transmission shaft respectively, a second toothed disc is fixedly arranged at the inner end of the output shaft, the first half-toothed disc, the second half-toothed disc and the second toothed disc all adopt teeth with the same specification, the outer rings of the first half-toothed disc and the second half-toothed disc only have a part of teeth, and the outer rings of the first toothed disc and the second toothed disc are full teeth; the packing frame comprises a chassis and a through rod vertically arranged on the chassis, and the gap part of the hub penetrates through the through rod.

In the precision machining equipment for the high-strength hub, the air tightness checking device in the step 5 comprises a detection box with a cavity, a sealing plate which can be opened and closed and is arranged above the detection box, a vacuumizing assembly for pumping out gas in the detection box, an inflating assembly for injecting detection gas into the detection box, a manipulator assembly for putting the hub into or taking the hub out of the detection box, and a positioning assembly for accurately positioning the hub put into the detection box, wherein the cavity in the detection box is enough for accommodating one or more hubs which are transversely arranged or transversely stacked; the locating component comprises a workpiece table fixedly arranged, a locating drive disc is rotatably arranged, a locating drive element is used for driving the locating drive disc to rotate slowly and positively, four locating limiting grooves are formed in the workpiece table in a centrosymmetric mode, locating slide blocks are arranged in the locating limiting grooves, locating collision rods are arranged above the locating slide blocks, locating guide rods are arranged below the locating slide blocks, four locating guide grooves are formed in the locating drive disc in a symmetric mode, the four locating guide rods are respectively and independently located in the four locating guide grooves, and the positions of the locating guide grooves to the rotating points of the locating drive disc are gradually decreased.

In the above-mentioned precision machining apparatus for a high-strength wheel hub, the station positioning device in step 4 includes a movable body for fixing a fixture and a positioning body for fixing on an imprinter, the positioning body is provided with a cavity having a size matched with that of the movable body, four magnetic bodies are fixedly arranged around the bottom of the movable body, four attracting magnets are fixedly arranged at four positions of the bottom of the cavity of the positioning body, the attracting magnetic properties of the attracting magnets are far greater than those of the movable body and the positioning body, a circle of first annular groove is formed in the bottom surface of the cavity of the positioning body, a circle of second annular groove is formed in the bottom surface of the movable body, a plurality of balls are densely arranged in the first annular groove, the first annular groove and the second annular groove are spliced to form an annular channel after the movable body is embedded in the cavity, the section of the annular channel is circular, the section size of the first reversing groove is greater than that of the second annular groove so that the balls do not separate from the first reversing groove, the side of the positioning body penetrates through and is provided with a first positioning hole, the side of the movable body is provided with a second positioning hole, and the first positioning hole and the second positioning hole are aligned after the positioning of the positioning body and the movable body is completed and a bolt can be inserted into the first positioning hole and the second positioning hole.

Compared with the prior art, this high strength wheel hub's processing form is unique, and the equipment that adopts can solve diversified problem, can process out intensity, the higher wheel hub of precision.

Drawings

FIG. 1 is a schematic view of a spray coating device;

FIG. 2 is a schematic view from the top side of the clamp assembly;

FIG. 3 is a schematic view of the underside of the clamp assembly;

FIG. 4 is a schematic view of the construction of the stacking and packaging apparatus;

FIG. 5 is a schematic diagram of the automatic stall drive assembly after hiding the stall drive element;

FIG. 6 is a schematic view of the structure of the airtightness inspection apparatus;

FIG. 7 is a schematic view of the positioning assembly from an upper perspective after concealing the positioning driving element;

FIG. 8 is a schematic view of the underside of the positioning assembly after concealing the positioning drive member;

FIG. 9 is a schematic view of the upper side of the positioning device when the movable body and the positioning body are separated;

FIG. 10 is a schematic view of the lower side of the positioning device when the movable body and the positioning body are separated;

1. a conveying platform; 2. a transverse screw rod; 3. a clamp member; 4. a support; 5. a vertical screw rod; 6. a painting element; 7. a spray head; 8. a drive wheel; 9. a belt; 10. a chassis; 11. positioning blocks; 12. a lifting block; 13. erecting a frame; 14. adjusting the screw rod; 15. a bidirectional screw rod; 16. a driven wheel; 17. adjusting the drive element; 18. a driving wheel; 19. a connecting belt; 20. tightening the tension wheel; 21. a packaging frame; 22. a conveying line; 23. a mechanical arm assembly; 24. an auto-stall drive component; 25. a first half fluted disc; 26. a transmission shaft; 27. an output shaft; 28. a first fluted disc; 29. a second half fluted disc; 30. a second fluted disc; 31. a detection box; 32. a sealing plate; 33. a vacuum pumping assembly; 34. a manipulator assembly; 35. a workpiece stage; 36. positioning a driving disc; 37. positioning a limiting groove; 38. positioning the sliding block; 39. positioning the impact rod; 40. positioning the guide rod; 41. positioning the guide groove; 42. a movable body; 43. a positioning body; 44. a cavity; 45. a magnetic body; 46. a attracting magnet; 47. a first annular groove; 48. a second annular groove; 49. a ball bearing; 50. and (4) a bolt.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

A processing technology of a high-strength hub comprises the following steps:

Wherein, the concrete structure of each device mentioned in the step is as follows:

as shown in fig. 1, the spraying device comprises a conveying platform 1, a clamp component 3 arranged on the conveying platform in a sliding manner through a transverse screw rod 2, two groups of supports 4 arranged on two sides of the conveying platform are fixed by a fixing frame, two paint spraying elements 6 arranged on the two groups of supports 4 in a vertical sliding manner through vertical screw rods 5, nozzles 7 are oppositely arranged on the two paint spraying elements 6, a driving wheel 8 is fixedly arranged above the two vertical screw rods 5, the two driving wheels 8 are tightly connected through a belt 9, a vertical driving element used for driving one of the vertical screw rods 5 to rotate is fixedly arranged on the support 4, and a transverse driving element used for driving the transverse screw rod 2 to rotate is fixedly arranged on the conveying platform.

In the operation process, the hub is clamped through the clamp part 3, then the hub is transported on the conveying platform, and when the hub is transported to the middle of the two spray heads 7, the clamp part 3 stops to enter the paint spraying process, in the process, the spray heads 7 on the two sides are integrally linked and lifted in the height direction, so that the two spray heads 7 are always at the same height, and the symmetrical spraying effect can be very uniform.

As shown in fig. 2 and 3, the fixture component 3 includes an underframe 10 with a hollow interior, two sets of positioning blocks 11, and two sets of lifting blocks 12, the lifting blocks 12 are provided with a spindle for butting against the center of the hub and a spindle driving element for driving the spindle to rotate, the two sets of positioning blocks 11 are oppositely arranged, and the positioning blocks 11 are provided with a gap for accommodating the hub.

The upper surface of chassis 10 has been to having seted up sharp location spout, the fixed sharp location slider that is equipped with in bottom of locating piece 11, two sets of locating pieces 11 set up in sharp location spout through sharp location slider subtend slip, still be equipped with two sets of grudging posts 13 on the chassis 10, the lift spout has been seted up on the grudging post 13, the elevator 12 slides and sets up in the lift spout, it is equipped with accommodate the lead screw 14 to go back vertical rotation in the lift spout, elevator 12 and accommodate the lead screw 14 threaded connection, the cavity department of chassis 10 is violently gone round and is rotated and is equipped with a two-way lead screw 15, two sharp location sliders are connected at two-way lead screw 15 both sides with the screw form respectively, two-way lead screw 15's both sides are positive screw and anti-thread respectively.

After the bidirectional screw rod 15 rotates, the two linear positioning sliding blocks are respectively connected with the positive thread and the negative thread of the bidirectional screw rod 15, so that the two linear positioning sliding blocks synchronously expand outwards or are synchronously gathered inwards, and the gaps between the two linear positioning sliding blocks are symmetrically changed by a central plane, so that the size of the two linear positioning sliding blocks can be adjusted according to the size of the hub.

The bottom of the adjusting screw rod 14 extends to the lower part of the base and is fixedly provided with a driven wheel 16, an adjusting driving element 17 is fixedly arranged below the bottom frame 10, the end part of an output shaft of the adjusting driving element 17 is provided with a driving wheel 18, the driving wheel 18 and the two driven wheels 16 are tightly connected through a connecting belt 19, a straight groove is further formed below the bottom frame 10, a tightening block is arranged in the straight groove in a sliding mode, a tightening elastic part is arranged between the tightening block and the straight groove, a tightening wheel 20 is arranged on the tightening block in a free rotating mode, and the tightening wheel 20 is attached to the connecting belt 19 from inside to outside.

With the above design, after the adjustment driving element 17 is started, the two driven wheels 16 synchronously rotate under the transmission benefits of the driving wheel 18 and the connecting belt 19, which ensures that the rotation benefits of the two adjustment screw rods 14 are the same, so that the two groups of lifting blocks 12 also lift with the same benefits, and the main shafts on the two lifting blocks 12 are always aligned no matter where the positions are, and can be effectively fixed from the two sides of the hub.

One end of the bidirectional screw rod 15 extends to the outer side of the underframe 10 and is fixedly provided with a handle, and the adjustment can be completed only by rotating the handle when the distance between the two groups of positioning blocks 11 is adjusted.

As shown in fig. 4 and 5, the stacking and packaging device includes a packaging frame 21, a conveying line 22 for conveying the packaging frame 21, and a robot assembly for loading hubs onto the conveying line 22, wherein the conveying line 22 employs an automatic stagnation driving assembly 24 to perform stepping and stagnation periodic operations, the automatic stagnation driving assembly 24 includes a driving bracket, a stagnation driving element fixedly disposed on the driving bracket, a first half-toothed disc 25 fixedly disposed on the stagnation driving element, a transmission shaft 26 rotatably disposed on the driving bracket, and an output shaft 27, a first toothed disc 28 and a second half-toothed disc 29 are respectively fixedly disposed at front and rear ends of the transmission shaft 26, a second toothed disc 30 is fixedly disposed at an inner end of the output shaft 27, the first half-toothed disc 25, the first toothed disc 28, the second half-toothed disc 29, and the second toothed disc 30 all employ teeth of the same specification, outer rings of the first half-toothed disc 25 and the second half-toothed disc 29 have only a part of teeth, the outer races of the first and second

toothed discs

28, 30 are full teeth.

The mechanical arm assembly is a mature technology, and generally adopts clamping claws to clamp the hub, and then the hub is moved to the upper part of the packaging frame 21 and put down.

The design is mainly that the conveying line 22 is designed to have the function of conveying and stopping at intervals, and the conveying and stopping are completed through the automatic stopping driving assembly 24. In operation, the outer end of the output shaft 27 is directly connected to the conveying line 22, then the stationary driving element is activated, the first half-toothed disc 25 starts to rotate, the transmission shaft 26 rotates when the teeth of the first half-toothed disc 25 are engaged with the first toothed disc 28, then the output shaft 27 rotates when the second half-toothed disc 29 on the transmission shaft 26 is engaged with the second toothed disc 30, and the conveying line 22 is stepped after the output shaft 27 rotates, the step process is to move the packaging frame 21 that has completed stacking and packaging the hub from the mechanical arm assembly, and the next packaging frame 21 to be packaged is to move to the mechanical arm assembly, the process is to complete the feeding, and the rest of the time (the first half-toothed disc 25 is separated from the first toothed disc 28 or/and the second half-toothed disc 29 is separated from the second toothed disc 30), the output shaft 27 cannot operate, and the process is to provide enough time for the mechanical arm assembly to complete multiple hub clamping and stacking operations, in addition, the output shaft 27 of the stationary driving element is still rotating continuously, its output shaft 27 can be connected to other parts, for example, the mechanical arm assembly also needs kinetic energy for operation, and the output shaft 27 of the driving element can be connected to some part of the mechanical arm assembly needing to be operated to provide part or all of its power source.

The packing frame 21 includes a chassis and a through rod vertically fixed on the chassis, and the gap portion of the hub passes through the through rod. The mechanical arm assembly clamps the wheel hubs which are placed on the side, moves to the upper part of the packing frame 21, and then stacks the wheel hubs on the chassis one by one, so that the packed wheel hubs are limited on the peripheral side because the inner gaps are arranged on the penetrating rods.

The conveying line 22 comprises two conveying wheels, a conveying belt tightly sleeved on the two conveying wheels, and an automatic stagnation driving assembly 24 for connecting with one conveying wheel.

As shown in fig. 6, the air tightness inspection device includes a detection box 31 having a chamber, a sealing plate 32 openably and closably disposed above the detection box 31, a vacuum-pumping unit 33 for pumping out air in the detection box 31, an inflation unit for injecting detection gas into the detection box 31, a manipulator unit 34 for taking in and out a wheel hub from the detection box 31, and a positioning unit for accurately positioning the wheel hub put into the detection box 31, the chamber in the detection box 31 is sufficient for accommodating a plurality of wheel hubs stacked in a transverse direction, and the inflation unit generally employs helium gas for the gas filled in the detection box 31.

Adopt manipulator assembly 34 to come automatically with a plurality of wheel hubs stack in detection case 31, detect a plurality of wheel hubs simultaneously and improve efficiency, if unqualified signal appears, again to this batch wheel hub go on one by one investigate can, manipulator assembly 34 can realize the automation of very big degree again.

However, the premise of stacking a plurality of hubs to improve efficiency is that the hubs can be automatically taken out of the detection box 31 after detection is finished, which requires secondary operation of the manipulator assembly 34, but many or few of the stacked hubs can be deviated under the influence of external factors in all aspects, so that it is necessary to position the hubs to ensure that the hubs are in the right center of the working position, and the applicant also provides a positioning assembly:

as shown in fig. 7 and 8, the positioning assembly includes a workpiece stage 35 fixedly disposed, a positioning driving disk 36 rotatably disposed, and a positioning driving element for driving the positioning driving disk 36 to rotate slowly and forwardly, four positioning limiting grooves 37 are symmetrically formed in the workpiece stage 35, positioning sliders 38 are disposed in the positioning limiting grooves 37, positioning plungers 39 are disposed above the positioning sliders 38, positioning guide rods 40 are disposed below the positioning sliders 38, four positioning guide slots 41 are symmetrically formed in the positioning driving disk 36, the four positioning guide rods 40 are respectively and independently disposed in the four positioning guide slots 41, and the positions of the positioning guide slots 41 to the rotation points of the positioning driving disk 36 gradually decrease.

The positioning driving element provides a larger power to rotate the positioning driving disk 36, the positioning guide rods 40 move in the positioning guide grooves 41 under the double limiting action of the positioning guide grooves 41 and the positioning limiting grooves 37, the positioning slide blocks 38 move in the positioning limiting grooves 37, the positioning slide blocks 38 approach or separate from the centers of the workpiece tables 35 synchronously because the positions of the workpiece tables 35 are fixed, the positioning slide blocks 38 approach or separate from the centers of the workpiece tables 35 synchronously, the positioning striking rods 39 push the hubs stacked on the worktable towards the central points in a folding mode in the synchronous approaching process until the four positioning striking rods 39 are completely clamped by the peripheries of the hubs, the positioning effect is completed, and all the hubs are positioned in the centers of the worktable, this makes it very accurate for the robot assembly 34 to remove them after the inspection process is complete.

Moreover, by adopting the positioning mode, the hubs with different specifications and diameters can be positioned because the hubs are circular, and the hubs can be positioned in the center of the workbench after being positioned.

However, because the mass of the hub is usually large and the weight of the hub is heavy when a plurality of hubs are stacked together, a large amount of power is required to position the driving element and each part with high strength, which is why the yarn is to slowly rotate the driving disc.

As shown in fig. 9 and 10, the station positioning device includes a movable body 42 for fixing the clamp and a positioning body 43 for fixing on the imprinter, a cavity 44 with a size matched with that of the movable body 42 is formed on the positioning body 43, four magnetic bodies 45 are fixedly arranged around the bottom of the movable body 42, four attracting magnets 46 are fixedly arranged at four positions of the bottom of the cavity 44 of the positioning body 43, and the attracting magnetic performance of the attracting magnets 46 is much greater than that of the movable body 42 and the positioning body 43.

The bottom surface of the cavity 44 of the positioning body 43 is provided with a circle of first annular groove 47, the bottom surface of the movable body 42 is provided with a circle of second annular groove 48, a plurality of balls 49 are densely arranged in the first annular groove 47, when the movable body 42 is embedded in the cavity 44, the first annular groove 47 and the second annular groove 48 are spliced to form an annular channel, the section of the annular channel is circular, and the section size of the first reversing groove is larger than that of the second annular groove 48, so that the balls 49 cannot be separated from the first reversing groove.

The side of the positioning body 43 is penetrated with a first positioning hole, the side of the movable body 42 is provided with a second positioning hole, and after the positioning of the positioning body 43 and the movable body 42 is completed, the first positioning hole and the second positioning hole are aligned and the bolt 50 can be inserted therein.

Compared with the traditional technology, the scheme has the advantages that after the movable body 42 is placed into the cavity 44 of the positioning body 43, the magnetic body 45 and the magnetic absorption body 46 which are arranged around the movable body and the magnetic body 45 respectively can act rapidly, the magnetic body 45 is moved to the position which is closest to the magnetic absorption body 46, and the position is qualitative and does not have other various states, so that the delicate positioning effect can be ensured, the process is rapid, and the positioning adjustment can be completed in a moment.

Certainly, because there are four attracting magnets 46 and four magnetic bodies 45, their collocation two by two will produce the different state all around, but this does not mean that this leads to the situation of location four or uncertainty, because people have already passed through naked eye information identification orientation in the process of placing movable body 42 to locating body 43 die cavity 44, what this scheme solved is the problem of location precision, because people do not necessarily can realize very accurate placing through manual operation or manipulator operation, will produce the deviation more or less always, this deviation numerical value is also not very big, so adopt attracting magnet 46 to attract magnetic body 45 and can accomplish quick location.

In addition, the purpose of the balls 49 is to make the adjustment process of the rotational positioning of the movable body 42 relative to the positioning body 43 more flexible, and the pin 50 is to fix the two after they are positioned, so that it is very stable during the process of marking.

It is to be understood that in the claims, the specification of the present invention, all "including … …" are to be interpreted in an open-ended sense, i.e., in a sense equivalent to "including at least … …", and not in a closed sense, i.e., in a sense not to be interpreted as "including only … …".

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. Step 1: putting an aluminum ingot into a smelting furnace, controlling the temperature at 800-850 ℃, and smelting for 25-30 minutes to obtain a molten liquid, wherein the aluminum ingot comprises the following components: 0.70-0.80% of silicon, 0.90-1.00% of magnesium, 0.20-0.25% of copper, 0.20-0.25% of iron, 0.05-0.10% of zinc, 0.05-0.10% of manganese, 0.04-0.06% of titanium, 0.15-0.18% of chromium, and the balance of aluminum;

2. The precision machining equipment for the high-strength hub according to claim 1, wherein: the spraying device comprises a conveying platform (1), clamp parts (3) arranged on the conveying platform (1) in a sliding mode through a transverse screw rod (2), two groups of supports (4) arranged on two sides of the conveying platform (1) through a fixing frame, two spraying elements (6) arranged on the two groups of supports (4) through a vertical screw rod (5) in a vertical sliding mode, spray heads (7) are oppositely arranged on the two spraying elements (6), a driving wheel (8) is fixedly arranged above the two vertical screw rods (5), the two driving wheels (8) are tightly connected through a belt (9), a vertical driving element used for driving one vertical screw rod (5) to rotate is fixedly arranged on the support (4), and a transverse driving element used for driving the transverse screw rod (2) to rotate is fixedly arranged on the conveying platform (1).

3. The precision machining equipment for the high-strength hub according to claim 2, wherein: the fixture component (3) comprises an underframe (10) with a hollow inner part, two groups of positioning blocks (11) and two groups of lifting blocks (12), wherein the lifting blocks (12) are provided with a spindle which is used for being butted with the center of a wheel hub and a spindle driving element which is used for driving the spindle to rotate, the two groups of positioning blocks (11) are oppositely arranged, the positioning blocks (11) are provided with a gap for accommodating the wheel hub, the upper surface of the underframe (10) is oppositely provided with a linear positioning chute, the bottom of the positioning blocks (11) is fixedly provided with a linear positioning slider (38), the two groups of positioning blocks (11) are oppositely arranged in the linear positioning chute in a sliding manner through the linear positioning slider (38), the underframe (10) is also provided with two groups of vertical frames (13), the vertical frames (13) are provided with lifting chutes, the lifting blocks (12) are arranged in the lifting chutes in a sliding manner, and adjusting screw rods (14) are also vertically and rotatably arranged in the lifting chutes, the lifting block (12) is in threaded connection with the adjusting screw rod (14), the hollow part of the bottom frame (10) is transversely provided with a bidirectional screw rod (15) in a rotating mode, the two linear positioning sliding blocks (38) are respectively connected to the two sides of the bidirectional screw rod (15) in a threaded mode, and the two sides of the bidirectional screw rod (15) are respectively provided with a positive thread and a negative thread.

4. The precision machining equipment for the high-strength hub according to claim 3, wherein: the bottom of the adjusting screw rod (14) extends to the lower portion of the base and is fixedly provided with a driven wheel (16), an adjusting driving element (17) is fixedly arranged below the bottom frame (10), the end portion of an output shaft (27) of the adjusting driving element (17) is provided with a driving wheel (18), the driving wheel (18) is tightly connected with the two driven wheels (16) through a connecting belt (19), a straight-shaped groove is further formed in the lower portion of the bottom frame (10), a tightening block is arranged in the straight-shaped groove in a sliding mode, a tightening elastic part is arranged between the tightening block and the straight-shaped groove, a tightening wheel (20) is arranged on the tightening block in a free rotating mode, and the tightening wheel (20) is attached to the connecting belt (19) from inside to outside.

5. The precision machining equipment for the high-strength hub according to claim 1, wherein: the stacking and packaging device in the step 8 comprises a packaging frame (21), a conveying line (22) for conveying the packaging frame (21), and a mechanical arm assembly (23) for loading the hubs onto the conveying line (22); the conveyor line (22) employs an auto-stop drive assembly (24) to perform step and stop periodic operations, the automatic stagnation driving assembly (24) comprises a driving support (4), a stagnation driving element fixedly arranged on the driving support (4), a first half-toothed disc (25) fixedly arranged on the stagnation driving element, a transmission shaft (26) and an output shaft (27) rotatably arranged on the driving support (4), wherein a first toothed disc (28) and a second half-toothed disc (29) are fixedly arranged at the front end and the rear end of the transmission shaft (26) respectively, a second toothed disc (30) is fixedly arranged at the inner end of the output shaft (27), the first half-toothed disc (25), the first toothed disc (28), the second half-toothed disc (29) and the second toothed disc (30) are all teeth of the same specification, the outer rings of the first half-toothed disc (25) and the second half-toothed disc (29) are only provided with partial teeth, and the outer rings of the first toothed disc (28) and the second toothed disc (30) are full teeth; the packing frame (21) comprises a chassis and a through rod vertically arranged on the chassis, and the gap part of the hub penetrates through the through rod.

6. The precision machining equipment for the high-strength hub according to claim 1, wherein: the air tightness inspection device in the step 5 comprises a detection box (31) with a cavity, a sealing plate (32) which can be opened and closed and is arranged above the detection box (31), a vacuumizing assembly (33) used for exhausting air in the detection box (31), an inflating assembly used for injecting detection air in the detection box (31), a manipulator assembly (34) used for putting the wheel hub into or taking the wheel hub out of the detection box (31), and a positioning assembly used for accurately positioning the wheel hub put into the detection box (31), wherein the cavity in the detection box (31) is enough to accommodate one wheel hub which is transversely placed or a plurality of wheel hubs which are transversely stacked; the locating component comprises a workpiece table (35) fixedly arranged, a locating driving disc (36) rotatably arranged, a locating driving element used for driving the locating driving disc (36) to slowly rotate forward and backward, four locating limiting grooves (37) are formed in the workpiece table (35) in a centrosymmetric mode, locating sliding blocks (38) are arranged in the locating limiting grooves (37), locating collision rods (39) are arranged above the locating sliding blocks (38), locating guide rods (40) are arranged below the locating sliding blocks (38), four locating guide grooves (41) are formed in the locating driving disc (36) in a symmetrical mode, the four locating guide rods (40) are respectively and independently located in the four locating guide grooves (41), and the locating guide grooves (41) gradually decrease from the position of the rotating point of the locating driving disc (36).

7. The precision machining equipment for the high-strength hub according to claim 1, wherein: the station positioning device in the step 4 comprises a movable body (42) for fixing a clamp and a positioning body (43) for fixing the movable body on an imprinter, wherein a cavity (44) with the size matched with that of the movable body (42) is formed in the positioning body (43), four magnetic bodies (45) are fixedly arranged on the periphery of the bottom of the movable body (42), four attracting magnets (46) are fixedly arranged at the four positions of the bottom of the cavity (44) of the positioning body (43), the magnetic attracting performance of the attracting magnets (46) is far greater than that of the movable body (42) and the positioning body (43), a circle of first annular groove (47) is formed in the bottom surface of the cavity (44) of the positioning body (43), a circle of second annular groove (48) is formed in the bottom surface of the movable body (42), a plurality of balls (49) are densely arranged in the first annular groove (47), and the first annular groove (47) and the second annular groove (48) are spliced to form an annular channel after the movable body (42) is embedded into the cavity (44), the cross-section of annular channel is circular, and the cross-sectional dimension in first switching-over groove is greater than the cross-sectional dimension of second ring channel (48) and makes ball (49) can not break away from first switching-over groove, and the side of location body (43) pierces through and has seted up first locating hole, and the second locating hole has been seted up to the side of activity body (42), and first locating hole aligns with the second locating hole after location completion of location body (43) and activity body (42) to can insert bolt (50) wherein.