A machining process for a compressor piston for a vehicle

Abstract

The application discloses a kind of vehicle-mounted compressor piston processing technology, solve the poor precision of existing piston processing technology in group welding, and the uneven thickness of coating processing and the workpiece that can further save material cost, simultaneously also corresponding welding machine and coating machine are designed to the specific structure of piston blank.Processing technology of piston at least includes the following steps: 3) bridge cup butt welding: supply piston bridge to work station and fixed clamping, corresponding piston cup is supplied simultaneously and coaxially on both sides of clamped piston bridge, the mouth of supplied piston cup is supplied to the orifice of piston bridge and is butt joint, butt joint is completed by friction welding technology after butt joint, immediately cut off piston cup part after welding, obtain piston blank;5) coating: clean piston blank and dry, carry out daoyin detection, daoyin value≦60mN / m, fluorine coating is carried out in turn on outer circle and wing part, and outer circle of piston blank is completed by rotary scraping coating, and wing part is completed by plane scraping coating.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle-mounted compressor piston processing, in particular to a vehicle-mounted compressor piston processing technology. BACKGROUND

[0002] The existing vehicle-mounted compressor piston is divided into solid and hollow structures. The solid structure is gradually eliminated due to poor thermal expansion performance and heavy weight. The hollow structure of the piston is mostly completed by two parts welding. The welding part adopts the welding method disclosed in CN1916414A, which adopts gas tungsten arc welding or tungsten inert gas welding. The gas tungsten arc welding is direct current gas tungsten arc welding, pulse gas tungsten arc welding and pulse gas tungsten arc welding with low-frequency cooperative pulse modulation. The tungsten inert gas welding refers to alternating current tungsten inert gas welding and pulse alternating current tungsten inert gas welding. Or the welding method disclosed in CN212803504U adopts MIG welding or TIG argon arc welding. The existing welding technology is difficult and not conducive to mass production. As shown in the piston, two weldings are required to complete the welding work, and two positionings are required for two weldings, which is easy to cause large piston coaxiality error. Figure 1

[0003] After welding, a wear-resistant layer of Teflon (polytetrafluoroethylene) and other components is obtained on the outside of the piston by spraying, for example, CN101670330A, CN114227181A, CN205731781U, CN202803488U and CN113522615A. The spraying method easily causes uneven coating thickness and air bubbles between the coating and the outer circle of the piston, affecting the wear resistance, and also causing a certain amount of waste of the coating liquid. The areas that do not need to be sprayed or have low wear resistance requirements are also inevitably sprayed. SUMMARY

[0004] The present application solves the problems of poor welding precision, uneven coating thickness and further saving material cost in the existing piston processing technology. The corresponding welding machine and coating machine are designed for the specific structure of the piston blank, and therefore a vehicle-mounted compressor piston processing technology is proposed.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A vehicle-mounted compressor piston processing technology, the piston processing technology at least includes the following steps:

[0007] 3) Bridge cup butt welding:

[0008] ​The piston bridge is supplied to the work station and fixed clamped, the corresponding piston cup is supplied on both sides of the clamped piston bridge simultaneously and coaxially, the cup opening of the supplied piston cup is supplied to the orifice of the piston bridge and butted, the butt joint is completed by friction welding technology after butting, the piston cup part is immediately cut off after welding, and the piston blank is obtained;

[0009] 5) painting:

[0010] The piston blank is cleaned and dried, and the daN value is detected, the daN value is ≦60 mN / m, the outer circle and the wing part are painted with Teflon in turn, and the outer circle of the piston blank is completed by rotary scraping and the wing part is completed by plane scraping.

[0011] Preferably, the bridge cup butt joint is completed by a welding machine;

[0012] The welding machine comprises a piston bridge conveying mechanism, a piston bridge clamping mechanism, a piston cup transverse conveying mechanism and a piston cup driving mechanism;

[0013] The piston bridge conveying mechanism comprises an inclined piston bridge conveying line, and the feeding end of the piston bridge conveying line is arranged at the bottom;

[0014] The piston bridge clamping mechanism comprises a wing clamping structure and an orifice clamping structure, the wing clamping structure is suitable for clamping the wing part of the middle part of the piston bridge, and the orifice clamping structure is suitable for clamping the outer circle of the orifice of the piston bridge;

[0015] The piston cup transverse conveying mechanism is suitable for transversely conveying the piston cup, and the piston cup cup opening is transversely butted at the orifice of the clamped piston bridge;

[0016] The piston cup driving mechanism comprises a driver, a clamping mechanism, a clutch and a stop mechanism, the output end of the driver is synchronously rotated or separated with the transmission shaft of the clamping mechanism through the clutch, and the stop mechanism is suitable for separating the output shaft of the driver and the transmission shaft of the clamping mechanism and immediately stopping the clamping mechanism.

[0017] Preferably, the stop mechanism comprises a moving disc and a fixed disc, the moving disc and the fixed disc are sleeved on the outside of the transmission shaft between the clamping mechanism and the clutch, a plurality of stop clamping rods are installed between the moving disc and the fixed disc, the moving disc slides axially relative to the fixed disc, the two ends of the stop clamping rod are respectively provided with universal shafts and are connected through the universal shafts and the corresponding disc, and the inclination directions of the plurality of stop clamping rods are consistent.

[0018] Preferably, the welding machine group welding bridge cup step is as follows:

[0019] 3.1) piston bridge feeding:

[0020] The feeding manipulator clamps the piston bridge on the bottom feeding end of the piston bridge conveying line and moves to the piston bridge clamping station, and is fixed and clamped through the wing clamping structure and the orifice clamping structure;

[0021] 3.2): Piston cup feeding:

[0022] The second feeding manipulator takes the piston cup from the corresponding piston cup conveying line on both sides of the piston bridge clamping station and transfers it to the clamping mechanism;

[0023] 3.3): Bridge cup butt joint:

[0024] The piston cup transverse conveying mechanism moves the clamped piston cup to the piston bridge bridge opening and butt joints;

[0025] 3.4): Friction welding:

[0026] The driver output end is connected with the clamping mechanism transmission shaft through the clutch to rotate synchronously, and the piston cup height rotates, while the piston cup transverse conveying mechanism feeds to the piston bridge bridge opening by a small distance to complete the bridge cup assembly welding;

[0027] 3.5): Brake down:

[0028] The driver output shaft and the clamping mechanism transmission shaft are separated through the clutch at the same time, and the clamping mechanism transmission shaft is immediately stopped, the wing clamping structure and the orifice clamping structure of the piston bridge clamping station loosen the piston blank, and the feeding manipulator takes off the piston blank, while the first feeding manipulator completes the feeding of the piston bridge.

[0029] Preferably, the outer circle and wing of the piston blank are coated by a coating machine, which comprises a reciprocating feeding mechanism, an outer circle coating part and a wing coating part;

[0030] The reciprocating feeding mechanism comprises a moving frame moving transversely and reciprocally at a fixed distance, a plurality of feeding assemblies are installed on the moving frame, the feeding assembly comprises an up-down feeding cylinder installed on the moving frame and adapted for vertical movement, a pneumatic clamping jaw is installed on the top of the up-down feeding cylinder, and the pneumatic clamping jaw is adapted to clamp the wing of the piston process connecting arm;

[0031] The outer circle coating part comprises an outer circle vertical conveying assembly, an outer circle scraping coating assembly, an outer circle scraping coating clamping assembly and an outer circle rotary driving assembly, the outer circle vertical conveying assembly is adapted to drive the outer circle scraping coating assembly to move up and down, the bottom of the outer circle scraping coating assembly is provided with an outer circle rotary scraper adapted for outer circle scraping coating, the outer circle scraping coating clamping assembly is adapted to clamp the piston blank supplied by the corresponding feeding assembly, and the outer circle rotary driving assembly is adapted to drive the outer circle scraping coating clamping assembly and the clamped piston blank;

[0032] The wing coating part comprises a wing transverse conveying assembly, a wing vertical conveying assembly, a wing scraping coating assembly and a wing scraping coating clamping assembly, the wing transverse conveying assembly is adapted to drive the wing vertical conveying assembly to move transversely, the wing vertical conveying assembly is adapted to drive the wing scraping coating assembly to move up and down, the bottom of the wing scraping coating assembly is provided with a plane scraper adapted for wing scraping coating, and the wing scraping coating clamping assembly is adapted to clamp the piston blank supplied by the corresponding feeding assembly.

[0033] Preferably, the outer circle vertical conveying assembly comprises an outer circle vertical servo motor, the output end of the servo motor is connected with a lead screw through a shaft coupling, and a sliding table is matched and installed on the lead screw;

[0034] The outer circle scraping assembly comprises a mounting frame mounted on the sliding table, an outer circle valve assembly is mounted on the mounting frame, and the outer circle valve assembly is externally connected with a paint supply device I through a pipeline; an outer circle rotary scraper is mounted at the bottom of the outer circle valve assembly, a control valve I is mounted on the outer circle valve assembly and is adapted to control quantitative paint supply to the outer circle surface, the inner part of the outer circle rotary scraper is provided with a cavity, and a first discharging port is arranged at the bottom of the outer circle rotary scraper and is in communication with the cavity;

[0035] The outer circle scraping clamping assembly comprises two clamping frames that are relatively moved or moved towards each other in the transverse direction, clamping shafts are rotatably mounted on the two clamping frames, and the two clamping shafts are adapted to transversely clamp the piston blank; and an outer circle rotary driving assembly is mounted on one of the clamping frames.

[0036] The outer circle rotary driving assembly comprises a rotary driving motor, and the rotary driving motor is in transmission cooperation with the corresponding clamping shaft through a belt and a transmission wheel.

[0037] Preferably, the wing transverse conveying assembly comprises a wing transverse driving motor, the output end of the wing transverse driving motor is connected with a transverse lead screw through a shaft coupling, and a transversely moving sliding frame is mounted on the transverse lead screw.

[0038] The wing vertical conveying assembly comprises a wing vertical cylinder, and the wing vertical cylinder is vertically mounted on the sliding frame.

[0039] The wing scraping assembly comprises a wing valve assembly, the wing valve assembly is mounted on the piston end of the wing vertical cylinder and moves up and down relative to the sliding frame, the wing valve assembly is externally connected with a paint supply device II through a pipeline, a control valve II is mounted on the wing valve assembly and is adapted to control quantitative paint supply to the wing surface, the inner part of the flat scraper is provided with a cavity, and a second discharging port is arranged at the bottom of the flat scraper and is in communication with the cavity.

[0040] The wing scraping clamping assembly comprises two clamping plates that are relatively moved or moved towards each other in the transverse direction, clamping blocks are mounted on opposite sides of the two clamping plates, and the two clamping blocks are adapted to transversely clamp the piston blank.

[0041] Preferably, the bottom of the outer circle rotary scraper is symmetrically provided with two groups of scraping zones, each group of scraping zones comprises an end scraping zone I, a middle scraping zone and an end scraping zone II arranged in sequence from the piston cup to the piston bridge direction, an inclined surface is arranged at the bottom of the region between the end scraping zone I, the middle scraping zone and the end scraping zone II, and the first discharging port is arranged at the inclined surface.

[0042] The bottom of the flat scraper extends downward and is provided with two symmetrical discharge ends, the bottom side of each of the two discharge ends is provided with an inclined surface, and a discharge port is arranged on the inclined surface. The flat scraper between the two discharge ends extends downward and is arranged transversely offset with a limiting end. A material blocking frame is mounted between the limiting end and the nearest discharge end. Two material blocking ends are arranged on the material blocking frame, extending first transversely and then downward. The two material blocking ends are respectively attached to the inner side of the anti-rotation surface, and the side of the material blocking end opposite to the discharge end is provided with an inclined limiting surface.

[0043] Preferably, the coating machine coats the outer circle and the wing of the piston blank with Teflon coating as follows:

[0044] Preparation: the moving frame moving transversely and reciprocating at a fixed distance moves the feeding end leftward with the feeding and discharging cylinder corresponding to the outer circle station, moves the outer circle station leftward with the feeding and discharging cylinder corresponding to the wing station, and moves the wing station leftward with the feeding and discharging cylinder corresponding to the discharging station. The feeding and discharging cylinder lifts the piston process connecting arm wing of the piston blank clamped by the pneumatic jaw in front of and behind the pneumatic jaw, and then the piston end of the feeding and discharging cylinder resets.

[0045] 5.1): outer circle station feeding:

[0046] The moving frame moves rightward to move the piston blank to the outer circle station, and the feeding and discharging cylinder feeds the clamped piston blank to the outer circle scraping coating clamping area. The two clamping frames moving relative to each other in the transverse direction drive the clamping shafts on them to clamp the clamping handles of both ends of the piston blank in the transverse and axial directions. The pneumatic jaw releases the piston blank, the piston end of the feeding and discharging cylinder resets, and the moving frame moves leftward to move the feeding and discharging cylinder corresponding to the outer circle station to the feeding end.

[0047] 5.2): outer circle coating:

[0048] The outer circle vertical servo motor drives the outer circle scraping assembly to descend to the designed elevation of the outer circle rotary scraper through the lead screw and sliding table.

[0049] The rotary drive motor drives the clamping shaft and the clamped piston blank to rotate. At the same time, the control valve on the valve assembly opens, a certain amount of Teflon coating is fed to the outer circle surface of the piston blank through the discharge port, the outer circle rotary scraper uniformly scrapes the coating, the outer circle rotary scraper coats the coating from thick to thin or at a constant thickness, the control valve cuts off the coating feeding channel, and the outer circle rotary scraper continues to rotate at least two times the number of revolutions of the coating feeding process after the channel is cut off.

[0050] The outer circle vertical servo motor reverses to drive the outer circle scraping assembly to ascend to the initial state through the lead screw and sliding table. During the ascending process, the rotary drive motor drives the clamping shaft and the outer circle coated piston blank to decelerate and stop at the initial angle. The number of revolutions of the entire coating process is an integer.

[0051] 5.3): outer circle station unloading:

[0052] The upper and lower feeding cylinders at the corresponding wing station drive the pneumatic clamps above them to lift and clamp the wing part of the piston process connection arm after outer circle coating. The two clamping frames move towards each other and reset. At the same time, the upper and lower feeding cylinders at the corresponding outer circle station drive the pneumatic clamps above them to clamp the wing part of the piston process connection arm at the feeding end. The piston ends of the upper and lower feeding cylinders at the two places reset.

[0053] 5.4): wing station feeding:

[0054] The moving frame moves right to move the upper and lower feeding cylinders at the corresponding wing station to the wing station, and the clamped piston blank is fed to the wing clamping station through the upper and lower feeding cylinders at the station. The two clamping plates move relative to each other to clamp the clamping handle of the piston blank.

[0055] 5.5): wing coating:

[0056] The wing vertical cylinder drives the wing valve assembly and the flat scraper to move downward to the designed elevation through the piston end. The control valve two on the wing valve assembly is opened, and the Teflon coating is once quantitatively fed to the anti-rotation surface through the unloading port two. The control valve two is closed.

[0057] The wing transverse drive motor drives the wing valve assembly and the wing flat scraper to move transversely through the transverse screw and the sliding frame. Each time, two anti-rotation surfaces are scraped and coated, and the scraping and coating action is completed twice to complete the scraping and coating action of four anti-rotation surfaces.

[0058] The wing vertical cylinder drives the wing valve assembly and the flat scraper to move upward to the initial height through the piston end.

[0059] 5.6): wing station unloading:

[0060] The upper and lower feeding cylinders at the corresponding discharge station lift the pneumatic clamps through the piston end, and then clamp the wing part of the piston process connection arm of the piston blank through the pneumatic clamps. The upper and lower feeding cylinders at the corresponding discharge station lower the pneumatic clamps through the piston end. Together with the moving frame, they move to the discharge station to enter the drying process and complete the discharge.

[0061] Preferably, before the bridge cup butt welding step, at least the following steps are further included:

[0062] 1) incoming material and blank inspection;

[0063] 2) piston bridge and cup processing and cleaning:

[0064] Processing the piston bridge: drilling the inner hole at the end of the piston bridge, boring the inner hole, and turning the end face of the piston bridge after boring the inner hole, and finally rough turning the outer circle;

[0065] Processing the piston cup: turning the end face of the piston cup, and the cup opening flatness is 0.1.

[0066] The processed piston bridge and piston cup are ultrasonically cleaned and dried;

[0067] The bridge cup butt welding and coating steps further comprise at least:

[0068] 4) Piston blank processing and cleaning:

[0069] The piston blank is turned on the outer circle, chamfered, end face, and clamping handle, the outer circle total runout is B: 0.02, the outer circle roughness is Rz5~Rz10, the clamping handle position degree is ZYX: 0.1, the clamping handle position degree is B: 0.06, and after processing, the piston blank is sprayed and cleaned and dried;

[0070] The coating step further comprises at least:

[0071] 6) Coating grinding: the outer circle of the Teflon coating is ground, the cylindricity is 0.005, the roughness is Ra0.8, the minimum thickness of the coating on the cylindrical part is 15㎛, and the coating thickness difference is less than 10㎛;

[0072] 7) Milling: end face milling, opening milling, let go milling, ball hole rough milling, and cutting are sequentially performed;

[0073] 8) Tinning: chemical tinning is performed on the top and ball hole, and wet drying treatment is adopted.

[0074] Compared with the prior art, the present application has the following beneficial effects:

[0075] The present application ensures the quality of the weld by friction welding the piston blank through the bridge cup and immediately stopping after welding is completed, and the rotary scraping of the outer circle of the piston blank and the planar scraping of the wing part are completed by scraping. Further, the high-quality and low-cost welding of the existing piston blank bridge cup is overcome, and the waste of raw materials and the phenomenon of damage to the non-spraying area caused by the previous spraying equipment are eliminated.

[0076] The present application also develops a device for friction welding of the bridge cup group for the specific structure of the piston blank, solves the problem that the existing friction group welding cannot be applied to the group welding work of the piston blank bridge cup structure, uses the feeding mechanical hand to complete the feeding of the piston bridge through forward and backward and up and down movements, clamps the piston bridge in the middle of the device through the wing clamping structure and the orifice clamping structure, uses another mechanical hand to feed the piston cup on both sides of the piston bridge, and clamps the piston cup after feeding by the clamping mechanism, relatively moves along the piston bridge axis direction and butt joints the bridge cup, completes the group welding through the rotary welding part, and immediately stops through the brake part after welding is completed to ensure the quality of the weld.

[0077] Another innovation of the present invention is that it provides a method for performing rotary coating of the outer circumference and flat coating of the wings on the specific structure of the piston blank shown in the figure, thereby ensuring the wear resistance and high temperature resistance of the piston outer circumference and wings (anti-rotation surface). Specifically, the piston blank, which has been welded and processed on the outer circumference, is continuously fed laterally through a reciprocating feeding portion, which is then loaded and unloaded to a coating station. The coating station is provided with a clamping portion for clamping the piston clamping handle. A servo motor is also arranged in the outer circumference rotary coating area to drive the clamping portion to rotate. The rotation of the clamped piston blank is completed via a motor belt and a drive pulley. A lowered scraper is used to evenly scrape the coating on the outer circumference of the piston blank. The coating is loaded onto the outer circumference of the piston blank through the interior of the scraper and a drainage port connected to the interior of the scraper. The coating thickness is effectively controlled by the scraper, and the coating thickness can be made more uniform due to the rotation of the piston blank.

[0078] The wing surface coating part provided on the equipment also uses the reciprocating feeding part to carry out outer circle coating unloading - horizontal conveying - wing coating loading on the piston blank after outer circle coating. The corresponding wing scraper is set according to the specific structure of the piston blank. The scraper is driven by the vertical up and down movement part to contact / separate the wing part of the piston blank. The wing scraper is indirectly driven by the horizontal reciprocating component to move horizontally to perform surface coating on the wing. The wing scraper is used to perform surface coating on four wings. Finally, the reciprocating feeding part is used to unload the piston blank and transfer it to the next station for drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] Figure 1 is a process flow chart of the present invention;

[0080] Figure 2 Schematic diagram of the overall structure of the welding machine proposed in the present invention;

[0081] Figure 3 Schematic diagram of the structure of the brake mechanism proposed in the present invention;

[0082] Figure 4 A side view of the brake mechanism proposed in the present invention;

[0083] Figure 5 A diagram showing the connection relationship between the guide frame and the movable plate in the braking mechanism proposed in the present invention;

[0084] Figure 6 The structure of the coating machine proposed in this invention is shown as follows Figure 1 ;

[0085] Figure 7 The structure of the coating machine proposed in this invention is shown as follows Figure 2 ;

[0086] Figure 8It is a structural schematic diagram of the flat scraper of the coating machine proposed in the present invention;

[0087] Figure 9 It is a structural schematic diagram of the rotary scraper of the coating machine proposed in the present invention. DETAILED DESCRIPTION

[0088] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0089] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0090] Example 1, a process for manufacturing a piston of a vehicle-mounted compressor, the process comprising at least the following steps:

[0091] 3) Bridge cup butt welding:

[0092] The piston bridge is supplied to the workstation and fixedly clamped. The corresponding piston cups are supplied simultaneously and coaxially on both sides of the clamped piston bridge. The mouths of the supplied piston cups are supplied to the openings of the piston bridge and connected. After the connection, the butt welding is completed by friction welding technology. After the welding is completed, the piston cup part is immediately cut off to obtain the piston blank.

[0093] 5) Painting:

[0094] The piston blank is cleaned and dried, and dyne test is carried out. The dyne value is ≤60mN / m. Teflon is coated on the outer circle and wing in turn. The outer circle of the piston blank is coated by rotary scraping and the wing is coated by flat scraping.

[0095] The piston blank is friction welded to the bridge cup and immediately stopped after welding to ensure weld quality. Rotary coating of the piston blank's outer diameter and flat coating of the wing area are also performed using scraping. This overcomes the high-quality, low-cost welding of existing piston blank bridge cups while eliminating the waste of raw materials and accidental damage to non-sprayed areas caused by conventional spraying equipment.

[0096] Example 2, based on the above example, the following improvements are made: the bridge cup butt welding is completed using a welding machine 100;

[0097] The welding machine 100 comprises a piston bridge conveying mechanism 101, a piston bridge clamping mechanism 102, a piston cup transverse conveying mechanism 103, and a piston cup driving mechanism 104.

[0098] The piston bridge conveying mechanism 101 comprises an inclined piston bridge conveying line 105, the feeding end of which is arranged at the bottom; the piston bridge conveying line 105 is a common inclined guide groove structure with a baffle.

[0099] The piston bridge clamping mechanism 102 comprises a wing clamping structure and an orifice clamping structure, the wing clamping structure being suitable for clamping the wings of the middle part of the piston bridge, and the orifice clamping structure being suitable for clamping the outer circle of the orifice of the piston bridge; the clamping structure is designed according to the specific structure of the piston bridge, and can also adopt a traditional pressure jaw structure for air pressure or hydraulic pressure.

[0100] The piston cup transverse conveying mechanism 103 is suitable for transversely conveying the piston cup, and the piston cup is transversely butted at the orifice of the clamped piston bridge; the piston cup transverse conveying mechanism 103 preferably selects a combination of a motor and a linear module of a lead screw and a sliding table.

[0101] The piston cup driving mechanism 104 comprises a driver 1041, a piston cup clamping piece 1042, a clutch 1044, and a stop mechanism 1043, the output end of the driver 1041 being synchronously rotated or separated with the transmission shaft of the piston cup clamping piece 1042 through the clutch 1044, and the stop mechanism 1043 being suitable for separating the output shaft of the driver 1041 and the transmission shaft of the piston cup clamping piece 1042 and immediately stopping the piston cup clamping piece 1042. The driver 1041 adopts a common servo motor, the piston cup clamping piece 1042 adopts a common chuck, the clutch 1044 is a clutch on a traditional friction welding, and a specific stop mechanism 1043 is additionally provided, which is also the innovation of the embodiment, the transmission shaft of the piston cup clamping piece 1042 is instantaneously stopped by the stop mechanism 1043, and the welding quality is ensured.

[0102] Example 3, based on the above example, the following improvements are made: the brake mechanism 1043 includes a movable plate 10431 and a fixed plate 10432, and the movable plate 10431 and the fixed plate 10432 are both mounted on the outside of the transmission shaft between the piston cup clamp 1042 and the clutch 1044, and multiple groups of brake rods 10433 are installed between the movable plate 10431 and the fixed plate 10432, and the movable plate 10431 slides axially relative to the fixed plate 10432, and universal shafts are respectively installed at both ends of the brake rod 10433 and are connected to the corresponding plates through the universal shafts via pins, nuts, and the inclination directions of the multiple groups of brake rods 10433 are consistent. A spring is installed between the movable disk 10431 and the fixed disk 10432, and the driving force of the movable disk 10431 comes from the ultra-high-strength electromagnetic field after the internal induction coil is energized, which is used to attract the fixed disk 10432. When the two are attracted to each other, the brake holding rod 10433 is twisted to clamp the drive shaft (after clamping, multiple brake holding rods 10433 form a twisted structure). The base of the fixed frame and the fixed disk 10432 is the same component, and the fixed frame and the base are arranged by sliding guide rails. The guide frame and the fixed disk are connected by springs. The movable disk 10431 will slide axially and rotate relative to the fixed disk 10432 at the same time (such as Figure 5 The matching structure of the guide block and guide groove shown in FIG.

[0103] Example 4: Based on the above example, the following improvements are made: the steps of welding the bridge cup by the welding machine 100 are as follows:

[0104] 3.1): Piston bridge loading:

[0105] The loading robot 1 clamps the piston bridge on the feeding end at the bottom of the piston bridge conveyor line 105 and moves it to the piston bridge clamping station, and fixes it by the wing clamping structure and the orifice clamping structure;

[0106] 3.2): Piston cup loading:

[0107] The second loading robot removes the piston cup from the corresponding piston cup conveyor line on both sides of the piston bridge clamping station and transfers it to the piston cup clamping piece 1042;

[0108] 3.3): Bridge cup docking:

[0109] The piston cup transverse conveying mechanism 103 moves the clamped piston cup to the bridge opening of the piston bridge and docks it;

[0110] 3.4): Friction welding:

[0111] The output end of the driver 1041 rotates synchronously with the transmission shaft of the piston cup holder 1042 through the clutch 1044, and the piston cup rotates at a high speed. At the same time, the piston cup transverse conveying mechanism 103 feeds the piston bridge port at a micro distance to complete the bridge cup assembly welding.

[0112] 3.5): stopping and discharging:

[0113] The moment when the output shaft of the driver 1041 and the transmission shaft of the piston cup holder 1042 are separated through the clutch 1044, the transmission shaft of the piston cup holder 1042 is immediately stopped, the wing part clamping structure and the orifice clamping structure of the piston bridge clamping station release the piston blank, the discharging manipulator takes away the piston blank, and at the same time, the feeding manipulator completes the feeding of the piston bridge.

[0114] In the above embodiment, the following improvements are made: the outer circle and wing part of the piston blank are coated by using a coating machine 200, and the coating machine 200 comprises a reciprocating feeding mechanism 201, an outer circle coating part 202, and a wing part coating part 203.

[0115] The reciprocating feeding mechanism 201 comprises a moving frame 2011 that moves laterally and reciprocally at a fixed distance, and a plurality of feeding assemblies are installed on the moving frame 2011. The feeding assembly comprises a feeding and discharging cylinder 2012 that is installed on the moving frame 2011 and is adapted to move vertically, and a pneumatic clamping jaw 2013 is installed on the top of the feeding and discharging cylinder 2012. The pneumatic clamping jaw 2013 is directly purchased from the market by the inventor, and is adapted to clamp the wing part of the piston process connecting arm.

[0116] The outer circle coating part 202 comprises an outer circle vertical conveying assembly 2021, an outer circle scraping coating assembly 2022, an outer circle scraping coating clamping assembly 2023, and an outer circle rotary driving assembly 2024. The outer circle vertical conveying assembly 2021 is adapted to drive the outer circle scraping coating assembly 2022 to move up and down, the bottom of the outer circle scraping coating assembly 2022 is provided with an outer circle rotary scraper 2025 that is adapted to coat paint, the outer circle scraping coating clamping assembly 2023 is adapted to clamp the piston blank supplied by the corresponding feeding assembly, and the outer circle rotary driving assembly 2024 is adapted to drive the outer circle scraping coating clamping assembly 2023 and the clamped piston blank.

[0117] The wing part coating part 203 comprises a wing part horizontal conveying assembly 2031, a wing part vertical conveying assembly 2032, a wing part scraping coating assembly 2033, and a wing part scraping coating clamping assembly 2034. The wing part horizontal conveying assembly 2031 is adapted to drive the wing part vertical conveying assembly 2032 to move horizontally, the wing part vertical conveying assembly 2032 is adapted to drive the wing part scraping coating assembly 2033 to move up and down, the bottom of the wing part scraping coating assembly 2033 is provided with a planar scraper 2035 that is adapted to coat paint, and the wing part scraping coating clamping assembly 2034 is adapted to clamp the piston blank supplied by the corresponding feeding assembly.

[0118] The outer circle scraping assembly 2022 is moved up and down by the outer circle vertical conveying assembly 2021 to achieve the close contact and separation with the piston, the outer circle scraping clamping assembly 2023 clamps the piston blank from the end, and then the outer circle is coated and scraped by the outer circle scraping assembly 2022, and the outer circle is scraped by the outer circle rotary driving assembly 2024 through the cooperation of the rotary scraping knife.

[0119] The wing part scraping assembly 2033 is moved up and down by the wing part vertical conveying assembly 2032 to achieve the close contact and separation with the piston, the wing part scraping clamping assembly 2034 clamps the piston blank from left and right, and the coating is planarly scraped by the wing part transverse conveying assembly 2031.

[0120] In the embodiment 6, the outer circle vertical conveying assembly 2021 comprises an outer circle vertical servo motor 20211, the output end of the outer circle vertical servo motor 20211 is connected with a lead screw through a shaft coupling, and a sliding table 20212 is matched and installed on the lead screw.

[0121] The outer circle scraping assembly 2022 comprises a mounting frame installed on the sliding table 20212, an outer circle valve assembly 20222 is installed on the mounting frame, the outer circle valve assembly 20222 is externally connected with a coating supply device one through a pipeline, an outer circle rotary scraping knife 2025 is installed at the bottom of the outer circle valve assembly 20222, a control valve one 20223 is installed on the outer circle valve assembly 20222 and is suitable for controlling the quantitative coating supply to the outer circle surface, a cavity is arranged in the inner part of the outer circle rotary scraping knife 2025 (communicating with the control valve one 20223) and a first discharging port 20251 is arranged at the bottom, and the first discharging port 20251 and the cavity are communicated.

[0122] The outer circle scraping clamping assembly 2023 comprises two clamping frames 20231 which are relatively or oppositely moved in the transverse direction, clamping shafts 20232 are rotatably installed on the two clamping frames 20231, the two clamping shafts 20232 are suitable for transversely clamping the piston blank, and the outer circle rotary driving assembly 2024 is installed on one of the clamping frames 20231.

[0123] The outer circle rotary driving assembly 2024 comprises a rotary driving motor 20241, and the rotary driving motor 20241 is in transmission cooperation with the corresponding clamping shaft 20232 through a belt and a transmission wheel.

[0124] In the embodiment 7, the wing part transverse conveying assembly 2031 comprises a wing part transverse driving motor 20311, the output end of the wing part transverse driving motor 20311 is connected with a transverse lead screw 20312 through a shaft coupling, and a transversely moving sliding frame 20313 is installed on the transverse lead screw 20312.

[0125] The wing vertical conveying assembly 2032 comprises a wing vertical cylinder 20321 vertically mounted on the slide 20313;

[0126] The wing scraping assembly 2033 comprises a wing valve assembly 20331 mounted on the piston end of the wing vertical cylinder 20321 and moving up and down relative to the slide 20313, the wing valve assembly 20331 being externally connected with the paint supply device two through a pipeline, and the wing valve assembly 20331 being provided with a control valve two 20332 adapted to control the quantitative paint supply to the wing surface, the inside of the flat scraping knife 2035 being provided with a cavity (communicating with the control valve two 20332) and the bottom being provided with a second discharge port 20351 communicating with the cavity;

[0127] The wing scraping clamping assembly 2034 comprises two clamping plates 20341 moving relative to or towards each other in the transverse direction, the two clamping plates 20341 being provided with clamping blocks 20342 on the opposite sides, and the two clamping blocks 20342 being adapted to clamp the piston blank in the transverse direction.

[0128] In the embodiment 8, on the basis of the above-mentioned embodiments, the following improvements are made: the bottom of the outer circle rotary scraping knife 2025 is symmetrically provided with two groups of scraping zones, each group of scraping zones comprising an end scraping zone one 20252, a middle scraping zone 20253 and an end scraping zone two 20254 arranged in sequence from the piston cup to the piston bridge direction, and the region between the end scraping zone one 20252, the middle scraping zone 20253 and the end scraping zone two 20254 being provided with an inclined surface at the bottom and the discharge port being arranged at the inclined surface.

[0129] The end scraping zone one 20252 is used for scraping the paint on the end of the piston bridge, while avoiding the paint flowing to the middle of the piston bridge; the end scraping zone two 20252 is used for scraping the paint on the end of the piston cup, while preventing the paint from flowing to the end surface. The middle scraping zone 20253 is used for scraping the inside of the oil groove, so as to ensure that the inside of the oil groove is also painted.

[0130] Example 9, on the basis of the above embodiment is improved as follows: the bottom of the flat scraper 2035 extends downwardly and is provided with two downward ends 20352 arranged symmetrically, the bottom side of each of the two downward ends 20352 is provided with an inclined surface, and a discharge port is formed on the inclined surface; the flat scraper 2035 between the two downward ends 20352 extends downwardly and is arranged laterally offset to a limiting end 20353, a material blocking frame 20354 is arranged between the limiting end 20353 and the nearest downward end 20352, two material blocking ends 20355 are arranged on the material blocking frame 20354 and extend laterally first and then downwardly, the two material blocking ends 20355 are respectively attached to the inner side of the anti-rotation surface, and the material blocking end 20355 is arranged on the side opposite to the downward end 20352 and is provided with an inclined limiting surface. The material blocking end 20355 is used to limit the position of the middle region of the anti-rotation surface of the piston, so as to prevent the paint from flowing too much to the middle.

[0131] Example 9, on the basis of the above embodiment is improved as follows: the steps of the coating machine 200 for coating Teflon paint on the outer circle and the wing part of the piston blank are as follows:

[0132] Preparation: the moving frame 2011 moving laterally and reciprocating at a certain distance moves the upper and lower feeding cylinders 2012 corresponding to the outer circle work station to the feeding end, moves the upper and lower feeding cylinders 2012 corresponding to the wing part work station to the outer circle work station, and moves the upper and lower feeding cylinders 2012 corresponding to the discharging work station to the wing part work station; the upper and lower feeding cylinders 2012 lift the pneumatic clamping jaws 2013 thereon to clamp the piston process connecting arm wing part of the piston blank at the feeding end through the pneumatic clamping jaws 2013, and then the piston end of the upper and lower feeding cylinders 2012 is reset;

[0133] 5.1): outer circle work station feeding:

[0134] The moving frame 2011 moves rightward to move the piston blank to the outer circle work station, the upper and lower feeding cylinders 2012 feed the clamped piston blank to the outer circle scraping coating clamping area, the two clamping frames 20231 relatively move in the lateral direction to drive the clamping shafts 20232 thereon to clamp the clamping handles of both ends of the piston blank in the lateral and axial directions, the pneumatic clamping jaws 2013 release the piston blank, the piston end of the upper and lower feeding cylinders 2012 is reset, and the moving frame 2011 moves leftward to move the upper and lower feeding cylinders 2012 corresponding to the outer circle work station to the feeding end.

[0135] 5.2): outer circle coating:

[0136] The outer circle vertical servo motor 20211 drives the outer circle scraping assembly 2022 to move downwardly to the outer circle rotary scraper 2025 to the designed elevation through the lead screw and the sliding table 20212.

[0137] Rotary drive motor 20241 drives the clamping shaft 20232 and the clamped piston blank to rotate, while the piston blank rotates, the control valve 1 20223 on the outer valve assembly 20222 opens, and the quantitative Teflon coating is fed to the outer surface of the piston blank through the feeding port 1 20251, the outer rotary scraper 2025 uniformly scrapes the coating, the outer rotary scraper 2025 is thickened or coated with a constant thickness, the control valve 1 20223 cuts off the coating supply path, and the outer rotary scraper 2025 continues to rotate at least twice the number of coating feeding process circles after the path is cut off.

[0138] The outer vertical servo motor 20211 reverses to drive the outer coating assembly 2022 through the screw and sliding table 20212 to rise to the initial state, and the rotary drive motor 20241 drives the clamping shaft 20232 and the outer coated piston blank to decelerate and stop to the initial angle during the rising process. The number of coating process circles is an integer number of circles.

[0139] 5.3): outer circle station unloading:

[0140] The upper and lower feeding cylinders 2012 corresponding to the wing station drive the pneumatic clamps 2013 thereon to lift and clamp the outer coated piston process connection arm wings, the two clamping frames 20231 move towards each other and reset, and at the same time, the upper and lower feeding cylinders 2012 corresponding to the outer circle station drive the pneumatic clamps 2013 thereon to clamp the outer circle station to clamp the piston process connection arm wings, and the piston ends of the upper and lower feeding cylinders 2012 at the two places reset.

[0141] 5.4): wing station feeding:

[0142] The moving frame 2011 moves right to drive the upper and lower feeding cylinders 2012 corresponding to the wing station to the wing station, and through the upper and lower feeding cylinders 2012 at the wing station, the clamped piston blank is fed to the wing clamping station, and the two clamping plates 20341 move relative to each other to clamp the clamping handle of the piston blank.

[0143] 5.5): wing coating:

[0144] The wing vertical cylinder 20321 drives the wing valve assembly 20331 and the plane scraper 2035 through the piston end to descend to the designed elevation, the control valve 2 20332 on the wing valve assembly 20331 opens, the Teflon coating is fed to the anti-rotation surface once through the feeding port 2 20351, and the control valve 2 20332 is closed.

[0145] The wing transverse drive motor 20311 drives the wing valve assembly 20331 and the wing plane scraper 2035 to move transversely through the transverse screw 20312 and the sliding frame 20313, and each time the two anti-rotation surfaces are scraped, the scraping action is completed twice to complete the scraping action of four anti-rotation surfaces.

[0146] The wing vertical cylinder 20321 drives the wing valve assembly 20331 and the flat scraper 2035 upward to the initial height through the piston end;

[0147] 5.6: wing station blanking:

[0148] The upper and lower feeding cylinder 2012 at the discharge station lifts the pneumatic clamp 2013 through the piston end, and then clamps the piston process connecting arm wing of the piston blank through the pneumatic clamp 2013. The upper and lower feeding cylinder 2012 at the discharge station lowers the pneumatic clamp 2013 through the piston end, and moves to the discharge station together with the moving frame 2011 to enter the drying process, and completes the discharging.

[0149] In the above embodiment, the following improvements are made:

[0150] 1) incoming material and blank inspection;

[0151] 2) processing and cleaning of piston bridge and cup:

[0152] Processing piston bridge: drilling inner hole at the end of piston bridge, boring the inner hole, turning the end face of piston bridge after boring the inner hole, and finally rough turning the outer circle;

[0153] Processing piston cup: turning the end face of piston cup, cup opening flatness: 0.1;

[0154] Ultrasonic cleaning and drying of processed piston bridge and piston cup;

[0155] Between the bridge cup butt welding and coating steps, at least:

[0156] 4) processing and cleaning of piston blank:

[0157] Turning the outer circle, chamfer, end face and clamping handle of the piston blank, outer circle total runout-B: 0.02, outer circle roughness: Rz5~Rz10, clamping handle position degree-ZYX: 0.1, clamping handle position degree-B: 0.06, after processing, spray cleaning and drying;

[0158] After the coating step, at least:

[0159] 6) coating grinding: outer circle grinding treatment is performed on the Teflon coating, cylindricality: 0.005, roughness: Ra0.8, minimum thickness of cylindrical coating: 15㎛, coating thickness difference <10㎛;

[0160] 7) milling: end face milling, opening milling, let go milling, ball socket rough milling and cutting are performed in sequence;

[0161] 8) tin plating: chemical tin plating is performed on the top and ball socket, and wet drying treatment is adopted.

[0162] The above description is merely that of the preferred embodiments of the application, but the protection scope of the application is not limited thereto. The alternatives can be partial structure, device, method step alternatives, or complete technical solutions. According to the technical solutions of the application and the inventive concept, equivalent replacement or change should be covered within the protection scope of the application.

Claims

1. A vehicle compressor piston processing process, characterized in that: The piston processing technology includes at least the following steps: 3) Bridge cup butt welding: The piston bridge is supplied to the workstation and fixedly clamped. The corresponding piston cups are supplied simultaneously and coaxially on both sides of the clamped piston bridge. The mouths of the supplied piston cups are supplied to the openings of the piston bridge and connected. After the connection, the butt welding is completed by friction welding technology. After the welding is completed, the piston cup part is immediately cut off to obtain the piston blank. 5) Painting: The piston blank is cleaned and dried, and then tested for dyne value ≤ 60mN / m. Teflon is applied to the outer circle and wing parts in sequence. The outer circle of the piston blank is coated with rotary scraping, and the wing parts are coated with flat scraping. The outer circle and wing parts of the piston blank are coated using a coating machine (200), which includes a reciprocating feeding mechanism (201), an outer circle coating part (202) and a wing coating part (203); The reciprocating feeding mechanism (201) comprises a movable frame (2011) capable of reciprocating and moving at a fixed distance in the horizontal direction, a plurality of feeding assemblies being mounted on the movable frame (2011), the feeding assemblies comprising a loading and unloading cylinder (2012) mounted on the movable frame (2011) and adapted for vertical movement, a pneumatic clamping jaw (2013) being mounted on the top of the loading and unloading cylinder (2012), the pneumatic clamping jaw (2013) being adapted for clamping the wing portion of the piston process connecting arm; The outer cylindrical coating portion (202) comprises an outer cylindrical vertical conveying assembly (2021), an outer cylindrical scraping assembly (2022), an outer cylindrical scraping clamping assembly (2023), and an outer cylindrical rotary drive assembly (2024); the outer cylindrical vertical conveying assembly (2021) is suitable for driving the outer cylindrical scraping assembly (2022) to move up and down; an outer cylindrical rotary scraper (225) suitable for scraping the outer cylindrical coating is installed at the bottom of the outer cylindrical scraping assembly (2022); the outer cylindrical scraping clamping assembly (2023) is suitable for clamping a piston blank supplied by a corresponding feeding assembly; and the outer cylindrical rotary drive assembly (2024) is suitable for driving the outer cylindrical scraping clamping assembly (2023) and the clamped piston blank; The wing coating part (203) comprises a wing transverse conveying assembly (2031), a wing vertical conveying assembly (2032), a wing scraping assembly (2033), and a wing scraping clamping assembly (2034); the wing transverse conveying assembly (2031) is suitable for driving the wing vertical conveying assembly (2032) to move transversely; the wing vertical conveying assembly (2032) is suitable for the wing scraping assembly (2033) to move up and down; a flat scraper (2035) suitable for wing scraping is installed at the bottom of the wing scraping assembly (2033); and the wing scraping clamping assembly (2034) is suitable for clamping the piston blank supplied by the corresponding feeding assembly; Two groups of scraping areas are symmetrically arranged at the bottom of the outer cylindrical rotating scraper (2025), and each group of scraping areas includes an end scraping area 1 (20252), a middle scraping area (20253), and an end scraping area 2 (20254) arranged in sequence along the direction from the piston cup to the piston bridge. The bottom of the area between the end scraping area 1 (20252), the middle scraping area (20253), and the end scraping area 2 (20254) is provided with an inclined surface, and the discharge port is provided at the inclined surface. The bottom of the flat scraper (2035) extends downward and is provided with two symmetrically arranged discharge ends (20352), one side of the bottom of the two discharge ends (20352) is provided with a slope surface, and a discharge port is opened on the slope surface. The flat scraper (20355) located between the two discharge ends (20352) extends downward and is provided with a limit end (20353) arranged in a transverse offset manner. A stopper frame (20354) is installed between the limit end (20353) and the nearest discharge end (20352). The upper edge of the stopper frame (20354) first extends transversely and then extends downward to be provided with two stopper ends (20355), the two stopper ends (20355) are respectively attached to the inner side of the anti-rotation surface, and an inclined limiter surface is provided on the side of the stopper end (20355) relative to the discharge end (20352).

2. A vehicle-mounted compressor piston processing process according to claim 1, characterized in that: The bridge cup butt welding is completed using a welding machine (100); The welding machine (100) comprises a piston bridge conveying mechanism (101), a piston bridge clamping mechanism (102), a piston cup transverse conveying mechanism (103), and a piston cup driving mechanism (104); The piston bridge conveying mechanism (101) comprises an inclined piston bridge conveying line (105), wherein the feeding end of the piston bridge conveying line (105) is arranged at the bottom; The piston bridge clamping mechanism (102) comprises a wing clamping structure and an orifice clamping structure, wherein the wing clamping structure is suitable for clamping the wing in the middle of the piston bridge, and the orifice clamping structure is suitable for clamping the outer circle of the orifice of the piston bridge; The piston cup transverse conveying mechanism (103) is suitable for transversely conveying the piston cup, and the piston cup mouth is transversely docked at the bridge mouth of the clamped piston bridge; The piston cup driving mechanism (104) comprises a driver (1041), a piston cup clamping member (1042), a clutch (1044) and a brake mechanism (1043). The output end of the driver (1041) rotates synchronously with or separates from the transmission shaft of the piston cup clamping member (1042) via the clutch (1044). The brake mechanism (1043) is suitable for immediately braking the piston cup clamping member (1042) while separating the output shaft of the driver (1041) from the transmission shaft of the piston cup clamping member (1042).

3. The process for machining a vehicle-mounted compressor piston according to claim 2, characterized in that: The brake mechanism (1043) comprises a movable plate (10431) and a fixed plate (10432), wherein the movable plate (10431) and the fixed plate (10432) are both mounted on the outside of the transmission shaft between the piston cup holder (1042) and the clutch (1044), and multiple sets of brake rods (10433) are mounted between the movable plate (10431) and the fixed plate (10432), and the movable plate (10431) slides axially relative to the fixed plate (10432). Universal shafts are respectively mounted at both ends of the brake rods (10433) and are connected to the corresponding plates via the universal shafts, and the inclination directions of the multiple sets of brake rods (10433) are consistent.

4. A vehicle-mounted compressor piston processing process according to claim 3, characterized in that: The steps of welding the bridge cup by the welding machine (100) are as follows: 3.1): Piston bridge loading: The loading robot 1 clamps the piston bridge on the feeding end at the bottom of the piston bridge conveyor line (105) and moves it to the piston bridge clamping station, and fixes and clamps it through the wing clamping structure and the orifice clamping structure; 3.2): Piston cup loading: The second loading robot removes the piston cup from the corresponding piston cup conveyor line on both sides of the piston bridge clamping station and transfers it to the piston cup clamping piece (1042); 3.3): Bridge cup docking: The piston cup transverse conveying mechanism (103) moves the clamped piston cup to the bridge opening of the piston bridge and docks the piston cup; 3.4): Friction welding: The output end of the driver (1041) is connected to the transmission shaft of the piston cup holder (1042) via the clutch (1044) and rotates synchronously, and the piston cup rotates at a high speed. At the same time, the piston cup transverse conveying mechanism (103) feeds the piston bridge port at a micro distance to complete the bridge cup assembly welding; 3.5): Brake to stop unloading: At the moment when the output shaft of the driver (1041) and the transmission shaft of the piston cup clamp (1042) are separated by the clutch (1044), the transmission shaft of the piston cup clamp (1042) is immediately braked, the wing clamping structure and the orifice clamping structure of the piston bridge clamping station release the piston blank, the unloading robot removes the piston blank, and the loading robot completes the loading of the piston bridge.

5. The process for machining a vehicle-mounted compressor piston according to claim 1, characterized in that: The outer circle vertical conveying assembly (2021) comprises an outer circle vertical servo motor (20211), the output end of the outer circle vertical servo motor (20211) is connected to a lead screw via a coupling, and a slide (2212) is matched and mounted on the lead screw; The outer circle scraping assembly (2022) includes a mounting frame mounted on a slide (20212), an outer circle valve assembly (20222) is mounted on the mounting frame, and the outer circle valve assembly (20222) is externally connected to a coating supply device through a pipeline, an outer circle rotating scraper (2025) is mounted on the bottom of the outer circle valve assembly (20222), and a control valve (20223) is mounted on the outer circle valve assembly (20222) for controlling the quantitative supply of coating to the outer circle surface, a cavity is provided inside the outer circle rotating scraper (25), and a discharge port (20251) is provided at the bottom, and the discharge port (20251) is communicated with the cavity; The outer cylindrical scraping clamping assembly (2023) includes two clamping frames (20231) that move relative to or toward each other in the transverse direction, and clamping shafts (20232) are rotatably mounted on the two clamping frames (20231). The two clamping shafts (20232) are suitable for laterally clamping the piston blank. The outer cylindrical rotation drive assembly (2024) is mounted on one of the clamping frames (20231). The outer circle rotation drive assembly (2024) comprises a rotation drive motor (20241), and the rotation drive motor (20241) forms a transmission match with the corresponding clamping shaft (20232) via a belt and a transmission wheel.

6. The process for machining a vehicle-mounted compressor piston according to claim 5, characterized in that: The wing transverse conveying assembly (2031) comprises a wing transverse driving motor (20311), the output end of the wing transverse driving motor (20311) being connected to a transverse lead screw (20312) via a coupling, and a transversely moving slide (20313) being mounted on the transverse lead screw (20312); The wing vertical conveying assembly (2032) comprises a wing vertical cylinder (20321), and the wing vertical cylinder (20321) is vertically mounted on the slide (20313); The wing scraping assembly (2033) includes a wing valve assembly (20331), which is mounted on the piston end of the wing vertical cylinder (20321) and moves up and down relative to the slide (20313). The wing valve assembly (20331) is externally connected to a second coating supply device via a pipeline. The wing valve assembly (20331) is mounted with a second control valve (20332) adapted to control the quantitative supply of coating to the wing surface. A cavity is provided inside the flat scraper (2035) and a second discharge port (20351) is provided at the bottom. The second discharge port (20351) is in communication with the cavity. The wing scraping clamping assembly (2034) includes two clamping plates (20341) that move relative to or toward each other in the transverse direction. Clamping blocks (20342) are installed on opposite sides of the two clamping plates (20341). The two clamping blocks (20342) are suitable for clamping the piston blank in the transverse direction.

7. The process for machining a vehicle-mounted compressor piston according to claim 6, characterized in that: The coating machine (200) coats the outer circle and wing of the piston blank with Teflon coating in the following steps: Preparation work: The movable frame (2011) that moves horizontally back and forth at a fixed distance moves the loading and unloading cylinder (2012) at the corresponding outer circle station to the left to the feeding end, moves the loading and unloading cylinder (2012) at the corresponding wing station to the left to the outer circle station, and moves the loading and unloading cylinder (2012) at the corresponding discharge station to the left to the wing station; the loading and unloading cylinder (2012) lifts the pneumatic clamp (2013) on it to clamp the piston process connecting arm wing of the piston blank at the feeding end through the pneumatic clamp (2013), and then the piston end of the loading and unloading cylinder (2012) returns to its original position; 5.1): External cylindrical station loading: The movable frame (2011) moves rightward to drive the piston blank to the outer cylindrical work station, and the clamped piston blank is loaded to the outer cylindrical scraping clamping area by the loading and unloading cylinder (2012), and the two clamping frames (20231) move relative to each other in the transverse direction to drive the clamping shafts (20232) thereon to clamp the clamping handles at both ends of the piston blank transversely and axially, the pneumatic clamping claws (2013) release the piston blank, the loading and unloading cylinder (2012) resets the piston end, and the movable frame (2011) moves leftward to the loading and unloading cylinder (2012) at the corresponding outer cylindrical work station and moves leftward to the feeding end; 5.2): External coating: The outer circle vertical servo motor (2211) drives the outer circle scraping assembly (222) to move downward to the outer circle rotating scraper (2025) to the designed elevation via the lead screw and the slide (20212); The rotary drive motor (20241) drives the clamping shaft (20232) and the clamped piston blank to rotate. When the piston blank rotates, the control valve 1 (20223) on the outer valve assembly (20222) opens, and a predetermined amount of Teflon coating is applied to the outer surface of the piston blank through the discharge port 1 (20251). The outer rotating scraper (2025) evenly scrapes the coating. The outer rotating scraper (2025) applies the coating from thick to thin or at a fixed thickness. The control valve 1 (2223) cuts off the coating supply passage. After cutting off the passage, the outer rotating scraper (2025) continues to rotate for at least twice the number of turns of the coating feeding process. The outer circle vertical servo motor (2211) reverses and drives the outer circle scraping assembly (222) upward to the initial state via the lead screw and the slide (2212). During the upward movement, the rotary drive motor (20241) drives the clamping shaft (20232) and the piston blank after the outer circle coating to slow down and stop at the initial angle. The number of turns of the entire coating process is an integer. 5.3): External cylindrical workstation blanking: The loading and unloading cylinder (2012) at the corresponding wing station drives the pneumatic clamp (2013) thereon to lift and clamp the piston process connecting arm wing after the outer circle is coated, and the two clamping frames (20231) move toward each other and reset. At the same time, the loading and unloading cylinder (2012) at the corresponding outer circle station drives the pneumatic clamp (2013) thereon to clamp the piston process connecting arm wing at the feeding end, and the piston ends of the loading and unloading cylinders (2012) at the two locations reset; 5.4): Wing loading station: The movable frame (2011) moves rightward to drive the loading and unloading cylinder (2012) at the corresponding wing station to move to the wing station, and the clamped piston blank is loaded to the wing clamping station by the loading and unloading cylinder (2012) there, and the two clamping plates (20341) move relative to each other to clamp the clamping handle of the piston blank; 5.5): Wing painting: The wing vertical cylinder (20321) drives the wing valve assembly (20331) and the flat scraper (2035) downward to the design elevation through the piston end, the control valve 2 (20332) on the wing valve assembly (20331) is opened, the Teflon coating is quantitatively fed to the anti-rotation surface through the discharge port 2 (20351) at one time, and the control valve 2 (20332) is closed; The wing transverse drive motor (20311) drives the wing valve assembly (20331) and the wing plane scraper (2035) to move transversely via the transverse lead screw (20312) and the slide (20313), scraping two anti-rotation surfaces each time, and the scraping action is performed twice to complete the scraping action of the four anti-rotation surfaces; The wing vertical cylinder (20321) drives the wing valve assembly (20331) and the flat scraper (2035) upward to the initial height via the piston end; 5.6): Wing cutting station: The loading and unloading cylinder (2012) at the corresponding discharging station lifts the pneumatic clamp (2013) through the piston end, and then the pneumatic clamp (2013) clamps the piston process connecting arm wing of the piston blank. The loading and unloading cylinder (2012) at the corresponding discharging station lowers the pneumatic clamp (2013) through the piston end, and moves to the discharging station together with the movable frame (2011) to enter the drying process to complete the discharging.

8. The process for machining a piston for a vehicle-mounted compressor according to claim 1, characterized in that: Before the bridge cup butt welding step, the method further comprises: 1) Inspection of incoming materials and blanks; 2) Piston bridge and cup processing and cleaning: Processing the piston bridge: Drill the inner hole at the end of the piston bridge and bore the inner hole. After boring the inner hole, turn the end face of the piston bridge and finally perform rough turning on the outer circle. Processing piston cup: turning on the end face of the piston cup, cup mouth flatness: 0.1; Ultrasonic cleaning and drying of the processed piston bridge and piston cup; The method further includes at least the following steps between the bridge cup butt welding and the painting step: 4) Piston blank processing and cleaning: Turning of piston blank outer circle, chamfer, end face and clamping handle, outer circle total runout-B: 0.02, outer circle roughness: Rz5~Rz10, clamping handle position-ZYX: 0.1, clamping handle position accuracy -B: 0.06, spray clean and dry after processing; After the coating step, the method further comprises: 6) Coating grinding: The Teflon coating is subjected to cylindrical grinding, with a cylindricality of 0.005, a roughness of Ra0.8, a minimum coating thickness of 15㎛ on the cylindrical part, and a coating thickness difference of <10㎛; 7) Milling: Face milling, file milling, clearance milling, ball and socket rough milling and cutting off are carried out successively; 8) Tin plating: Chemical tin plating on the top and ball socket, and wet drying treatment.

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