Laser welding seat equipment

Abstract

The utility model relates to laser welding seat equipment which comprises a tool assembly fixing frame, a welding tool A and a welding tool B, the welding tool A and the welding tool B are arranged on the tool assembly fixing frame, and an argon arc welding machine and a laser welding machine are arranged behind the tool assembly fixing frame and used for welding workpieces limited on the welding tool A and the welding tool B. The device is simple in structure and reasonable in design, the welding tool A and the welding tool B are arranged to stably limit all workpiece sub-pieces, the welding stability and quality are guaranteed, the workpieces on the welding tool A are welded through the argon arc welding machine, then the welded workpieces on the welding tool A are limited to the welding tool B and welded through the laser welding machine, and the welding efficiency is improved. Welding quality of workpieces is improved, working efficiency is improved, and cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a laser welding seat equipment. BACKGROUND

[0002] With the diversified development of the function of the automobile seat, the seat increases various actuation functions, such as: leg support mechanism, ventilation heating system, control box and wire harness assembly, so that the corresponding skeleton mechanism needs to be added to the skeleton of the seat, which leads to higher welding requirements between the skeleton sheet metals of the seat, and the existing part of the seat skeleton welding generally adopts argon arc welding alone, argon arc welding is full welding through the upper sheet metal elliptical hole and the lower sheet metal, and the disadvantage is that whether the welding pass is completely melted deep cannot be judged from the appearance inspection, and the daily ultrasonic flaw detection inspection is carried out through the first piece, and the melting depth test of the destructive welding pass is carried out regularly, however, when the welding process finds the defect, there are many unqualified products, and there is a great safety hazard, and because the seat frame is different from the chair back which is completely covered by the surface cover, the lower end function part and the contact surface of the vehicle body carpet are all exposed surfaces, and need to be electroplated and coated, since the lower end of the welding pass of the upper sheet metal is easy to leave pollutants when the argon arc welding is carried out, even if the coating is carried out after pickling, yellow rust spots will be generated after a period of time, especially when the seat frame is exported, after a long time of sea transportation, land transportation and storage, there is a great probability to cause rust problems, in addition, the part of the seat skeleton is generally laser welded alone, since the welding machine needs to carry the laser beam for focusing, the welding gun head is long, and the welding range is limited, so that the full welding cannot be carried out on the lower end arc and narrow position of the seat frame, and the use is inconvenient, meanwhile, the welding parts of the existing seat skeleton generally adopt simple jigs for limiting, so that the position of the welding part is easy to deviate, and the welded seat skeleton cannot meet the quality requirements. CONTENT OF THE UTILITY MODEL

[0003] The utility model improves the above problems, that is, the technical problem to be solved by the utility model is to provide a laser welding seat equipment which is simple in structure and convenient to use.

[0004] The utility model is such a constitution, it includes frock assembly fixed frame and sets up welding frock A and welding frock B on frock assembly fixed frame, the rear of frock assembly fixed frame is provided with argon arc welding machine and laser welding machine, is used to carry out welding to the work piece limited on welding frock A and welding frock B respectively.

[0005] Further, the welding frock A includes welding frock body A and left positioning mechanism A and right positioning mechanism A set on the upper side of both sides of welding frock body A, the upper side of the front and rear part of welding frock body A is provided with front positioning mechanism A and rear positioning mechanism A respectively, the left positioning mechanism A, right positioning mechanism A, front positioning mechanism A and rear positioning mechanism A are used to clamp and limit the work piece.

[0006] Further, the left positioning mechanism A comprises a left fixed plate A arranged above the welding tool body A, a left positioning pin A and a left positioning pin B arranged at the middle front and back of the left fixed plate A, a left pressing and clamping mechanism A and a left pressing and clamping mechanism B arranged at the front and back of the left fixed plate A respectively to clamp the workpiece, the left pressing and clamping mechanism A and the left pressing and clamping mechanism B each comprising a left clamping jaw A and a left clamping jaw cylinder A to drive the left clamping jaw A to swing, the left fixed plate A connected with the tool assembly fixing frame through two slide rails A, the slide rails A fixed on the surface of the tool assembly fixing frame, a slide groove arranged below the left fixed plate A to cooperate with the slide rails A, the left fixed plate A driven by the left top cylinder A to move left and right along the slide rails A, a hand pushing and clamping mechanism A arranged in front of the left fixed plate A, the hand pushing and clamping mechanism A comprising a hand pushing and clamping fixed plate A, a hand pushing and clamping push handle A and a hand pushing and clamping short rod A, the lower end of the hand pushing and clamping push handle A hinged to the hand pushing and clamping fixed plate A, the middle of the hand pushing and clamping push handle A hinged to the hand pushing and clamping short rod A, the other end of the hand pushing and clamping short rod A hinged to the left fixed plate A, the hand pushing and clamping fixed plate A fixed on the tool assembly fixing frame, and the right positioning mechanism identical in structure with the left positioning mechanism.

[0007] Further, the rear positioning mechanism A comprises a rear pipe frame positioning block A, a rear pipe frame positioning groove A arranged above the rear pipe frame positioning block A, and a rear pipe frame pressing and clamping mechanism A arranged in front of the rear pipe frame positioning A to press the workpiece on the rear pipe frame positioning groove A.

[0008] Further, the front positioning mechanism A comprises a front fixed frame A, a front positioning pin A, a front positioning pin B and a front positioning pin C arranged on the front fixed frame A, a front positioning block A arranged behind the front fixed frame A, a front pressing and clamping mechanism A arranged behind the front positioning block A, and a front pressing and clamping mechanism B and a front pressing and clamping mechanism C respectively arranged in front of the front positioning pin A and the front positioning pin B, the front pressing and clamping mechanism A, B and C each comprising a front clamping jaw A and a front clamping jaw cylinder A to drive the front clamping jaw A to swing and clamp the workpiece.

[0009] Further, the welding tool B comprises a welding tool body B and a left positioning mechanism B and a right positioning mechanism B arranged above both sides of the welding tool body B, the top of the front and back of the welding tool body B respectively arranged with a front positioning mechanism B and a rear positioning mechanism B, the left positioning mechanism B, the right positioning mechanism B, the front positioning mechanism B and the rear positioning mechanism B to clamp and position the workpiece, the front left clamping mechanism B and the front right clamping mechanism B respectively arranged at both sides of the front of the welding tool body B, and the rear left clamping mechanism B and the rear right clamping mechanism B respectively arranged at both sides of the rear of the welding tool body B.

[0010] Compared with the prior art, the device has the following beneficial effects: the device is simple in structure and convenient to use, each workpiece part is stably positioned by the welding tool A and B, offset of the workpiece parts during lapping is avoided, welding stability and quality are ensured, the workpiece on the welding tool A is welded by the argon arc welding machine, the welded workpiece on the welding tool A is positioned on the welding tool B together with other workpieces and welded by the laser welding machine, the welding machine can uniformly use the welding wire with a wire diameter of 1.0 MM, and Ar argon is uniformly used as the protective gas, the workpiece cooperation precision is improved by the close tool clamp and the positioning pin on the welding tool A and B, the laser beam can be more easily focused through the metal elliptical hole, the pollution of oxygen and nitrogen in the air is avoided by using the 1.5-2.5 KW power laser welding and argon intervention, oxidation caused by high temperature in the welding area is avoided, workpiece high temperature deformation is avoided, hydrogen cracking is avoided, and impurities in the molten pool can also be removed, the heat around the workpiece during the welding process is reduced, the area affected by temperature is reduced, the weld reaches the optimal penetration, and rust marks will not be generated on the surface of the workpiece whether it is electrophoretic coating or electrostatic powder spraying due to less pollutants, the welding of the double robots can be carried out by a single person, and manpower and equipment investment are greatly reduced, and the welding tool can be used for different parts styles, and the seat frame of the same vehicle model can be arbitrarily clamped, and the standard welding effect and strength can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a whole structure schematic view of the embodiment of the utility model;

[0012] Figure 2 It is the top view of welding tool A and welding tool B of the embodiment of the utility model;

[0013] Figure 3 It is the seat frame structure schematic view of the embodiment of the utility model;

[0014] Figure 4 It is the leg support seat frame structure schematic view of the embodiment of the utility model;

[0015] Figure 5 It is the top view of welding tool A of the embodiment of the utility model;

[0016] Figure 6 It is the left side structure schematic view of welding tool A of the embodiment of the utility model Figure 1 ;

[0017] Figure 7 It is the left side structure schematic view of welding tool A of the embodiment of the utility model Figure 2 ;

[0018] Figure 8 It is the right side structure schematic view of welding tool A of the embodiment of the utility model Figure 1 ;

[0019] Figure 9 For the embodiment of the utility model welding tool A right side structure schematic Figure 2 ;

[0020] Figure 10 For the embodiment of the utility model welding tool A's front positioning mechanism A structure schematic drawing

[0021] Figure 11 For the embodiment of the utility model welding tool A's front positioning mechanism A working state schematic Figure 1 ;

[0022] Figure 12 For the embodiment of the utility model welding tool A's front positioning mechanism A working state schematic Figure 2 ;

[0023] Figure 13 For the embodiment of the utility model welding tool A's front positioning mechanism A working state schematic

[0024] Figure 14 For the embodiment of the utility model welding tool A's front positioning mechanism A working state schematic

[0025] Figure 15 For the embodiment of the utility model welding tool A's front positioning mechanism A working state schematic

[0026] Figure 16 For the embodiment of the utility model welding tool A's front positioning mechanism A working state schematic

[0027] Figure 17 For the embodiment of the utility model welding tool A's front positioning mechanism A working state schematic

[0028] Figure 18 For the embodiment of the utility model welding tool A's front positioning mechanism A working state schematic

[0029] Figure 19 For the embodiment of the utility model welding tool B plan view

[0030] Figure 20 For the embodiment of the utility model welding tool B partial plan view

[0031] Figure 21 For the embodiment of the utility model welding tool B right side structure schematic Figure 1 ;

[0032] Figure 22 For the embodiment of the utility model welding tool B right side structure schematic Figure 2 ;

[0033] Figure 23 For the embodiment of the utility model welding tool B left side structure schematic Figure 1 ;

[0034] Figure 24 The left side structure schematic view of the welding tool B of the embodiment of the present application Figure 2 ;

[0035] Figure 25 The left side structure schematic view of the welding tool B of the embodiment of the present application

[0036] Figure 26 The left side structure schematic view of the welding tool B of the embodiment of the present application

[0037] Figure 27 The left side structure schematic view of the welding tool B of the embodiment of the present application

[0038] Figure 28 The left side structure schematic view of the welding tool B of the embodiment of the present application

[0039] Figure 29 The left side structure schematic view of the welding tool B of the embodiment of the present application

[0040] Figure 30 The left side structure schematic view of the welding tool B of the embodiment of the present application

[0041] Figure 31 The left side structure schematic view of the welding tool B of the embodiment of the present application

[0042] Figure 32 The left side structure schematic view of the welding tool B of the embodiment of the present application

[0043] Figure 33 The left side structure schematic view of the welding tool B of the embodiment of the present application Figure 1 ;

[0044] Figure 34 The left side structure schematic view of the welding tool B of the embodiment of the present application Figure 2 ;

[0045] Figure 35 The left side structure schematic view of the welding tool B of the embodiment of the present application

[0046] Figure 36 The left side structure schematic view of the welding tool B of the embodiment of the present application

[0047] Figure 37 The left side structure schematic view of the welding tool B of the embodiment of the present application DETAILED DESCRIPTION

[0048] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0049] Example 1: As Figures 1 to 37 As shown, in this embodiment, a laser welding stand device is provided, including a tooling assembly fixing frame 1 and welding fixtures A4 and B5 disposed on the tooling assembly fixing frame. An argon arc welding machine 112 and a laser welding machine 113 are disposed behind the tooling assembly fixing frame. The argon arc welding machine is used to weld the workpiece located on the welding fixture A, and the laser welding machine is used to weld the workpiece on the welding fixture B.

[0050] In this embodiment of the utility model, the device can be used to manufacture two types of workpieces. Workpiece one is a seat frame assembly 103, and workpiece two is a leg support seat frame assembly 104. The seat frame assembly 103 is formed by welding the right side plate 7, the left side plate 8, the front tube frame sub-assembly 9, and the rear tube frame 10 into an upper seat frame 6 in the welding fixture A4, and then welding the upper seat frame 6 to the front legs 88 (front legs 71), the front legs 89, the rear legs 86, and the rear legs 87. The leg support seat frame assembly 10 is formed by welding the right side plate 7, the left side plate 12, the leg support front tube frame 13, and the rear tube frame 10 into a leg support upper seat frame 11 in the welding fixture A4, and then welding the leg support upper seat frame 11 to the front legs 88 (front legs 71), the front legs 89, the rear legs 86, and the rear legs 87.

[0051] In this embodiment of the utility model, welding fixture A4 is mainly used to weld the upper seat frame 6 or the leg rest upper seat frame 11. When welding the upper seat frame 6, the upper seat frame 6 is composed of the right side plate 7, the left side plate 8, the front tube frame sub-assembly 9, and the rear tube frame 10. When welding the leg rest upper seat frame 11, the leg rest upper seat frame 11 is composed of the right side plate 7, the left side plate 12, the leg rest front tube frame 13, and the rear tube frame 10. The left side plate 12 can be additionally fitted with sheet metal fixing pieces and can be equipped with an ECU control box according to the vehicle configuration requirements. The leg rest front tube frame 13 is equipped with a leg rest mechanism according to the vehicle configuration requirements for adjusting the comfort of the passenger's legs.

[0052] The welding fixture A4 includes a welding fixture body A and a left positioning mechanism A and a right positioning mechanism A disposed on the upper sides of both sides of the welding fixture body A. A front positioning mechanism A and a rear positioning mechanism A are respectively disposed on the upper front and rear parts of the welding workpiece body A. The left positioning mechanism A, the right positioning mechanism A, the front positioning mechanism A and the rear positioning mechanism A are used to clamp and limit the workpiece.

[0053] The left positioning mechanism A is used to limit the left side plate 8 or the left side plate 12, the right positioning mechanism A is used to limit the right side plate 7, the front positioning mechanism A is used to limit the front tube rack sub-assembly 9 or the leg support front tube rack 13, and the rear positioning mechanism A is used to limit the rear tube rack 10.

[0054] The left positioning mechanism A includes a left fixed plate A14 arranged above the welding tool body A, a left positioning pin A18 and a left positioning pin B19 arranged at the front and back of the middle of the left fixed plate A, a left clamping mechanism A20 and a left clamping mechanism B21 arranged at the front and back of the left fixed plate A respectively to clamp the workpiece, the left clamping mechanism A and the left clamping mechanism B each include a left jaw A and a left jaw cylinder A to drive the left jaw A to swing, the left fixed plate A is connected with the tool assembly fixing frame through two slide rails A, the two slide rails A include a first slide rail A24 and a second slide rail A25, the slide rail A is fixed to the surface of the tool assembly fixing frame, a slide groove is arranged below the left fixed plate A to cooperate with the slide rail A, the left fixed plate A is driven by a left top cylinder A22 to move left and right along the slide rail A. The left clamping mechanism A and the left clamping mechanism B are prior art, the left jaw cylinder A is fixed to a cylinder mounting seat, the left jaw A is hinged between the left jaw cylinder A, the cylinder mounting seat and the left jaw A are connected through a connecting rod, the connecting rod is hinged at both ends to the cylinder mounting seat and the left jaw A respectively, and each clamping mechanism has the same structure as the left clamping mechanism A.

[0055] The left positioning pin A and the right positioning pin A are used to fix the left side plate 12 or the left side plate 8, the hole position of the left side plate 12 or the left side plate 8 cooperates with the left positioning pin A and the right positioning pin, and then the left clamping mechanism A20 and the left clamping mechanism B21 clamp the left side plate 12 or the left side plate.

[0056] The left fixed plate A is provided with a hand clamping mechanism A in front, the hand clamping mechanism A23 includes a hand clamping fixed plate A, a hand clamping push handle A and a hand clamping short rod A, the lower end of the hand clamping push handle A is hinged to the hand clamping fixed plate A, the middle of the hand clamping push handle A is hinged to the hand clamping short rod A, the other end of the hand clamping short rod A is hinged to the left fixed plate A, and the hand clamping fixed plate A is fixed to the tool assembly fixing frame.

[0057] Because the volume shrinkage occurs in the process of the molten metal from liquid to solid during the welding process, the metal generates tension and moves to the welding direction, causing certain deformation, and the hand clamping mechanism A is arranged to manually intervene the auxiliary mechanism to open the clamp, so as to take out the workpiece.

[0058] The right positioning mechanism and the left positioning mechanism are symmetrical and have the same structure. The right positioning mechanism A includes a right fixed plate A15 arranged above the welding tool body A. The right fixed plate A has a right positioning pin A26 and a right positioning pin B27 arranged at the front and back of the middle part. The right fixed plate A has a right pressing and clamping mechanism A28 and a right pressing and clamping mechanism B29 arranged at the front and back of the middle part, respectively, to clamp the workpiece. The right pressing and clamping mechanism A and the right pressing and clamping mechanism B each include a right clamping jaw A and a right clamping jaw cylinder A to drive the right clamping jaw A to swing. The right fixed plate A is connected to the tool assembly fixing frame through two slide rails B. The two slide rails B include a first slide rail B32 and a second slide rail B33. The slide rails B are fixed to the surface of the tool assembly fixing frame. The right fixed plate A has a sliding groove arranged below the right fixed plate A to cooperate with the slide rails B. The right fixed plate A is driven by a right top cylinder A30 to move left and right along the slide rails B.

[0059] The right positioning pin A26 and the right positioning pin B27 cooperate with the hole positions on the right side plate. Then the right pressing and clamping mechanism A and the right pressing and clamping mechanism B clamp the right side plate.

[0060] The right fixed plate A has a hand pushing and clamping structure D31 arranged in front of the right fixed plate A. The hand pushing and clamping structure D31 includes a hand pushing and clamping fixed plate D, a hand pushing and clamping push handle D, and a hand pushing and clamping short rod D. The hand pushing and clamping push handle D is hinged to the hand pushing and clamping fixed plate D at the lower end. The hand pushing and clamping push handle D is hinged to the hand pushing and clamping short rod D at the middle part. The hand pushing and clamping short rod D is hinged to the left fixed plate D at the other end. The hand pushing and clamping fixed plate D is fixed to the tool assembly fixing frame.

[0061] Because the volume of the deposited metal shrinks during the process from liquid to solid during the welding process, the metal generates tension and moves to the welding direction, causing deformation. The hand pushing and clamping structure D can manually open the clamping to facilitate the removal of the workpiece.

[0062] The rear positioning mechanism A includes a rear pipe frame positioning block A16. The rear pipe frame positioning block A has a rear pipe frame positioning groove A arranged above the rear pipe frame positioning block A. The rear pipe frame positioning A has a rear pipe frame pressing and clamping mechanism A17 arranged in front of the rear pipe frame positioning groove A to press the workpiece tightly on the rear pipe frame positioning groove A. The rear pipe frame pressing and clamping mechanism A includes a rear pipe frame clamping jaw A and a rear pipe frame clamping jaw cylinder A to drive the rear pipe frame clamping jaw A to swing.

[0063] The rear pipe frame positioning block A16 is used to fix the rear pipe frame 10. After the rear pipe frame is sleeved into the left side plate from the side, the pipe body of the rear pipe frame is in the rear pipe frame positioning groove A. Then the rear pipe frame pressing and clamping mechanism A is used to press tightly.

[0064] The front positioning mechanism A includes a front fixed frame A, a front positioning pin A 35, a front positioning pin B 36 and a front positioning pin C 37 arranged on the front fixed frame A, a front positioning block A 34 arranged behind the front fixed frame A, a front clamping mechanism A 38 arranged behind the front positioning block A, and a front clamping mechanism B 40 and a front clamping mechanism C 39 arranged in front of the front positioning pin A and the front positioning pin B respectively.

[0065] The front pipe frame small assembly 9 and the leg support front pipe frame 13 are fixed by the front positioning pin A 35, the front positioning pin B 36 and the front positioning pin C 37, and are clamped by the front clamping mechanism A 38, the front clamping mechanism C 39 and the front clamping mechanism B 40.

[0066] In the embodiment of the utility model, the welding tool B5 is mainly used for welding the upper seat frame 6 or the leg support upper seat frame 11 and the front leg frame 88 (the front leg frame 71), the front leg frame 89, the rear leg frame 86 and the rear leg frame 87.

[0067] The welding tool B5 includes a welding tool body B and left and right positioning mechanisms B arranged above both sides of the welding tool body B, the welding tool body B is provided with a front positioning mechanism B and a rear positioning mechanism B above the front and rear parts respectively, the left and right positioning mechanisms B, the front positioning mechanism B and the rear positioning mechanism B are used for clamping and limiting the workpiece, the welding tool body B is provided with a front left clamping mechanism B and a front right clamping mechanism B on both sides of the front part respectively, and the welding tool body B is provided with a rear left clamping mechanism B and a rear right clamping mechanism B on both sides of the rear part respectively.

[0068] The left positioning mechanism B includes a left fixed plate B 41, a left positioning pin fixing mechanism B 65, a left positioning pin C 63 and a left positioning pin D 64 arranged inside the left fixed plate B, the left positioning pin fixing mechanism B, the left positioning pin C and the left positioning pin D are sequentially arranged from front to back along the left fixed plate, the left positioning pin fixing mechanism B includes a left movable positioning pin B and a left movable positioning pin top cylinder B used for driving the left movable positioning pin B to stretch and retract, the left fixed plate B is provided with a left clamping mechanism C 66 and a left clamping mechanism D 67 used for clamping the workpiece, and the left clamping mechanism C and the left clamping mechanism D both include a left clamping jaw C and a left clamping jaw cylinder C used for driving the left clamping jaw C to swing;

[0069] The left positioning mechanism is used to limit the left side of the upper seat frame 6 or the leg support upper seat frame 11, and the left positioning pin fixing mechanism B65, the left positioning pin C63 and the left positioning pin D64 are used to position the upper seat frame 6 or the leg support upper seat frame 11, and the left pressing clamp mechanism C66 and the left pressing clamp mechanism D67 are used to clamp the left side of the upper seat frame 6 or the leg support upper seat frame 11.

[0070] The left fixed plate B is connected between the tool assembly fixing frame through two slide rails C, the two slide rails C include a first slide rail C69 and a second slide rail C70, the first slide rail C69 and the second slide rail C70 can increase the friction and stability of the mechanism, the slide rails C are fixed on the surface of the tool assembly fixing frame, and a slide groove C used for cooperating with the slide rails C is arranged below the left fixed plate B, the left fixed plate B is driven by the left top cylinder C62 to move left and right along the slide rails C; a hand pushing clamp structure B is arranged on the outer side of the left fixed plate B, the hand pushing clamp structure B includes a hand pushing clamp fixed plate B, a hand pushing clamp push handle B and a hand pushing clamp short rod B, the lower end of the hand pushing clamp push handle B is hinged to the hand pushing clamp fixed plate B, the middle part of the hand pushing clamp push handle B is hinged to the hand pushing clamp short rod B, the other end of the hand pushing clamp short rod B is hinged to the left fixed plate B, and the hand pushing clamp fixed plate B is fixed on the tool assembly fixing frame.

[0071] Because the volume shrinkage occurs in the process of the molten metal from liquid to solid during the welding process, the metal generates tension, thereby causing the metal to move to the direction of the weld, resulting in certain deformation, and the hand pushing clamp structure B can be manually intervened to assist the mechanism to open the clamp, so that the workpiece can be taken out.

[0072] The right positioning mechanism B includes the right fixed plate B42 and the right positioning pin fixing mechanism one 57, the right positioning pin fixing mechanism two 57, the right positioning pin C51 and the right positioning pin D52 arranged on the inner side of the right fixed plate B, the right positioning pin fixing mechanism one and the right positioning pin fixing mechanism two each include a right movable positioning pin 56 and a right movable positioning pin top cylinder B55 used to drive the right movable positioning pin to stretch and retract, the right fixed plate B is provided with the right pressing clamp mechanism C59, the right pressing clamp mechanism D53 and the right pressing mechanism E54 used to clamp the workpiece, and the right pressing clamp mechanism C, the right pressing clamp mechanism D and the right pressing mechanism E each include a right clamp jaw C and a right clamp jaw cylinder C used to drive the right clamp jaw C to swing.

[0073] The right positioning mechanism is used to limit the right side of the upper seat frame 6 or the leg support upper seat frame 11, the right positioning pin fixing mechanism one 57, the right positioning pin fixing mechanism two 57, the right positioning pin C51 and the right positioning pin D52 are used to position the upper seat frame 6 or the leg support upper seat frame 11, and the right pressing clamp mechanism C59, the right pressing clamp mechanism D53 and the right pressing mechanism E54 are used to clamp the right side of the upper seat frame 6 or the leg support upper seat frame 11.

[0074] The right fixed plate B is connected with the tool assembly fixed frame through two slide rails D, the two slide rails D include a first slide rail D60 and a second slide rail D61, the first slide rail D60 and the second slide rail D61 can increase the mechanism friction and stability, the slide rail D is fixed on the surface of the tool assembly fixed frame, a sliding groove D is arranged below the left fixed plate B and used to cooperate with the slide rail D, the right fixed plate B is driven by a right top cylinder C50 arranged on the outside of the right fixed plate B to move left and right along the slide rail D; a hand push clamping structure C is arranged on the outside of the right fixed plate B, the hand push clamping structure C includes a hand push clamping fixed plate C, a hand push clamping push handle C and a hand push clamping short rod C, the lower end of the hand push clamping push handle C is hinged with the hand push clamping fixed plate C, the middle part of the hand push clamping push handle C is hinged with the hand push clamping short rod C, the other end of the hand push clamping short rod C is hinged with the right fixed plate B, and the hand push clamping fixed plate C is fixed on the tool assembly fixed frame.

[0075] The front positioning mechanism B49 includes a front frame and positioning pins one 90, positioning pins two 91, positioning pins three 92, positioning pins four 95, positioning pins five 100 and positioning pins six 101 arranged on the front frame, the positioning pins four and the positioning pins five are driven to stretch and retract by a positioning pin top cylinder 94 arranged on the lower part in an inclined manner, and the rear part of the front frame is provided with a pressing and clamping mechanism one 96 and a pressing and clamping mechanism two 98 used to press the workpiece; the pressing and clamping mechanism one and the pressing and clamping mechanism two each include a front clamping jaw B and a front clamping jaw B cylinder used to drive the front clamping jaw B to swing and clamp.

[0076] The front positioning mechanism B49 is used to fix the front pipe frame small assembly 9 of the upper seat frame 6 or the lap joint fixing of the leg support front pipe frame 13 of the leg support upper seat 11 and the front sheet metal 102; the positioning pins two 91 and the positioning pins three 92 are used to fix the front pipe frame small assembly 9 of the upper seat frame 6, the positioning pins one 90 is used to fix the leg support front pipe frame 13 of the leg support upper seat 11, and the specific configuration is changed according to the selected vehicle model; the positioning pins four 95 and the positioning pins five 100 are used to fix the front sheet metal 102, the positioning pins six 101 are used to fix the tail end ventilation sheet metal mounting hole of the front sheet metal 102, and the pressing and clamping mechanism one 96 and the pressing and clamping mechanism two 98 are used to clamp the sheet metal 102.

[0077] The rear positioning mechanism B includes a rear pipe frame positioning block B and a rear pipe frame positioning block B groove arranged above the rear pipe frame positioning block B, and the rear pipe frame positioning block B rear is provided with a rear pipe frame B clamping mechanism 44; the rear pipe frame B clamping mechanism includes a rear pipe frame B clamping jaw and a rear pipe frame B clamping cylinder used to drive the rear pipe frame B clamping jaw to swing and clamp the workpiece.

[0078] The rear pipe frame positioning block B43 of the rear positioning mechanism B is used to fix the rear pipe frame 10, and is fixed through the rear pipe frame B clamping mechanism B44.

[0079] In the embodiment of the utility model, the front left clamping mechanism B45 includes a front left foot support positioning block B75 and two front left foot support fixing pins 751 arranged on the front left foot support positioning block B, a front left foot support pressing and clamping mechanism 73 for clamping workpieces is arranged on the side of the front left foot support positioning block B;

[0080] The front left clamping mechanism B45 is mainly applied to fixing the front foot support 88, the two front left foot support fixing pins 751 are matched with the hole positions of the front foot support 88, and then the front left foot support pressing and clamping mechanism is clamped.

[0081] The rear left clamping mechanism B46 includes a rear left foot support positioning block B72 and two rear left foot support movable pins arranged on the rear left foot support positioning block B, the two rear left foot support movable pins include a rear left foot support movable pin one 84 and a rear left foot support movable pin two 85, the two rear left foot support movable pins are driven to stretch and retract by a rear left foot support movable pin cylinder, rear left foot support pressing and clamping mechanisms are arranged on the front and rear of the rear left foot support positioning block B for clamping workpieces, and the two rear left foot support pressing and clamping mechanisms include a rear left foot support pressing and clamping mechanism one 74 and a rear left foot support pressing and clamping mechanism two 83.

[0082] The rear left clamping mechanism B46 is mainly used for fixing the rear foot support 86, the rear foot support 86 is matched with the hole positions through the rear left foot support movable pin one 84 and the rear left foot support movable pin two 85, and then the rear left foot support pressing and clamping mechanism one 74 and the rear left foot support pressing and clamping mechanism two 83 are clamped.

[0083] The front right clamping mechanism B47 includes a front right positioning block B79 and a profiling positioning groove arranged on the front right positioning block B, two front right top cylinder mechanisms for limiting workpieces are arranged on the side of the front right positioning block B, the two front right top cylinder mechanisms include a front right top cylinder mechanism one 80 and a front right top cylinder mechanism two 82, the front right top cylinder mechanism includes a front right positioning pin and a front right top cylinder for driving the front right positioning pin to stretch and retract;

[0084] The front right clamping mechanism B47 is mainly applied to fixing the front foot support 89, the front foot support 89 is arranged in the profiling positioning groove on the front right positioning block B, and then the front right top cylinder mechanism one 80 and the front right top cylinder mechanism two 82 are limited.

[0085] The structure of the rear right leg movable pin is same as that of the rear left clamping mechanism, the rear right clamping mechanism B48 comprises a rear right leg positioning block B76 and two rear right leg movable pins arranged on the rear right leg positioning block B, the two rear right leg movable pins comprise a rear right leg movable pin one and a rear right leg movable pin two, the two rear right leg movable pins are driven to stretch out and retract by a rear right leg movable pin cylinder, and rear right leg pressing and clamping mechanisms are arranged on the front and rear of the rear right leg positioning block B and used for clamping workpieces; the two rear right leg pressing and clamping mechanisms comprise a rear right leg pressing and clamping mechanism one 77 and a rear right leg pressing and clamping mechanism two 78; the front left leg pressing and clamping mechanism, the rear left leg pressing and clamping mechanism and the rear right leg pressing and clamping mechanism all comprise a leg clamping jaw and a leg clamping jaw cylinder used for driving the leg clamping jaw to swing and clamp a workpiece.

[0086] The rear right clamping mechanism B48 is mainly applied to fixing the rear leg 87.

[0087] In the embodiment of the utility model, three control valves 105 are arranged on the welding tool body A of the welding tool A4, which are used for respectively controlling the clamping or unlocking of each pressing and clamping mechanism of the welding tool A4; four control valves 108 are arranged on the welding tool body B of the welding tool B5, which are used for controlling the clamping or unlocking of each pressing and clamping mechanism of the welding tool B5.

[0088] In the embodiment of the utility model, the laser welding machine 113 adopts laser wire filling welding, the high-energy-density laser beam focuses on the welding point 117 through the laser beam 114, the laser beam melts the molten pool of the hole of the front sheet metal 102 and the surface of the left side plate 8 after heating, then fills the welding wire of the wire feeding mechanism 116 to carry out welding, and the optimal welding effect is achieved through the intervention of the argon gas 115, which has the advantages that the thick workpiece is welded by the small-power laser, the intervention of the argon gas can avoid the pollution of oxygen and nitrogen in the air, avoid the oxidation caused by the high temperature of the welding area, ensure that the workpiece does not deform at high temperature, avoid the generation of hydrogen cracks, and also can remove the impurities in the molten pool; the welding bead 117, the welding bead 118, the welding bead 119 and the welding bead 120 are important welding beads for the fusion of the front sheet metal 102 and the left side plate 8 and the right side plate 7.

[0089] In the embodiment of the utility model, when the seat frame assembly 103 is made: the right side plate 7, the left side plate 8, the front pipe frame small assembly 9 and the rear pipe frame 10 are limited in the welding tool A4, and the upper seat frame 6 is formed by the argon arc welding machine 112; the upper seat frame 6 is taken out, the upper seat frame 6, the front leg 88 (the front leg 71), the front leg 89, the rear leg 86, the rear leg 87 and the front sheet metal 102 are respectively limited in the corresponding position of the welding tool B, then laser wire filling welding is carried out by the laser welding machine, the optimal welding effect is achieved by cooperating with the argon gas, and the seat frame assembly 103 is taken out.

[0090] When making the leg support seat frame assembly 104: by limiting the right side plate 7, the left side plate 12, the leg support front pipe frame 13, the rear pipe frame 10 in the welding tool A4, the leg support upper seat frame 11 is welded by the argon arc welding machine 112; the leg support upper seat frame 11 is taken out, the leg support upper seat frame 11, the front leg frame 88 (the front leg frame 71), the front leg frame 89, the rear leg frame 86, the rear leg frame 87, and the front sheet metal 102 are respectively limited in the corresponding position of the welding tool B, and then laser filler welding is carried out by the laser welding machine, and the optimal welding effect is achieved by cooperating with the protective gas argon, and the leg support seat frame assembly 104 is taken out.

[0091] In the embodiment of the utility model, based on the embodiment 1, taking the welding seat frame assembly 103 as an example: taking the left side plate 8 and fixing the left positioning pin A18, the left positioning pin B19 on the left side fixed plate 14 of the welding tool A4, taking the rear pipe frame 10 and fixing it by penetrating the left side plate 8 and placing the rear pipe frame positioning block A in the rear pipe frame positioning groove A of the rear pipe frame positioning block A, taking the front pipe frame small assembly 9 and fixing it by placing it at the front positioning mechanism A, taking the right side plate 7 and fixing it by fixing the right positioning pin A26, the right positioning pin B27 on the right side fixed plate 15 of the welding tool A4, driving the left top cylinder A22, the right top cylinder A30 to drive the left side fixed plate 14, the right side fixed plate 15 to retract and reset, clamping the rear pipe frame 10, the front pipe frame small assembly 9, the left pressure clamping mechanism A20 and the left pressure clamping mechanism B21 clamping the left side plate 8, the right pressure clamping mechanism A and the right pressure clamping mechanism B clamping the right side plate 7, the front pressure clamping mechanism A38, the front pressure clamping mechanism C39, the front pressure clamping mechanism B40 clamping the front pipe frame small assembly 9, the rear pipe frame pressure clamping mechanism A17 clamping the rear pipe frame 10, after clamping, starting the switch argon arc welding machine 112 to start welding, after welding, three mechanical valves are sequentially opened, because the volume shrinkage occurs in the process of molten metal from liquid to solid during the welding process, so that the metal generates tension, thereby causing the metal to move to the welding direction, causing certain deformation, respectively actuating the hand push clamping structure A, the hand push clamping structure D to assist the left side fixed plate 14, the right side fixed plate 15 to open the clamp and take out the upper seat frame 6 for standby; the front left clamping mechanism B45 is used for limiting the front leg 88, the rear left clamping mechanism B46 is used for limiting the rear leg 86, the front right clamping mechanism B47 is used for limiting the front leg 89, and the rear right clamping mechanism B48 is used for limiting the rear leg 87; the upper seat frame 6 is taken and placed on the welding tool B5, the left positioning mechanism B, the right positioning mechanism B, the front positioning mechanism B and the rear positioning mechanism B are used for limiting the upper seat frame 6, and the front sheet metal is taken and placed in the front end of the upper seat frame 6 and is limited; the welding tool 4 can continue to install the upper seat frame 6 welding subassembly, and the welding tool A4, the welding tool B5 can achieve the effect of circulating production; after clamping, the switch laser welding machine 113 is started to start laser filler metal welding, the laser beam 114 is focused on the welding point 117, the high-energy-density laser beam heats and melts the molten pool of the hole of the front sheet metal 102 and the surface of the left side plate 8, and then the welding wire is filled into the filler metal feeding mechanism 116 to perform welding, and the optimal welding effect is achieved through the intervention of the argon gas 115, the advantages are that the thick workpiece is welded by the small power laser, the argon gas intervention can avoid the pollution of oxygen and nitrogen in the air, avoid the oxidation caused by the high temperature of the welding area, ensure that the workpiece does not deform at high temperature, avoid the generation of hydrogen cracks, and also can remove the impurities in the molten pool; the welding bead 117, the welding bead 118, the welding bead 119 and the welding bead 120 are important welding beads for the fusion of the front sheet metal 102, the left side plate 8 and the right side plate 7.After welding, the four mechanical valves are sequentially opened, because the volume of the molten metal will shrink during the process from liquid to solid, which will cause the metal to move to the welding direction, resulting in certain deformation, respectively actuating the hand push clamp structure B, the hand push clamp structure C, the left fixed plate B41 of the left positioning mechanism B, the right fixed plate B of the right positioning mechanism B to open the clamp and take out the welded seat assembly 103.

[0092] The device uses different welding methods of double robots, which is that the argon arc welding is used when the sheet metal and the pipe are overlapped and welded in the upper engineering (welding welding tool A4 welding upper seat 6 or leg support upper seat 11), and the laser filler welding is used when the sheet metal and the sheet metal are overlapped and welded in the lower engineering (welding welding tool B5 welding seat assembly 103 or leg support seat assembly 104), the advantages of which are that the welding machine can uniformly use the welding wire with a diameter of 1.0 MM, and the protective gas uniformly uses Ar argon; the workpiece cooperation precision is improved through the close tool clamp and the positioning pin joint, the laser beam can be more easily focused through the sheet metal elliptical hole, the pollution of oxygen and nitrogen in the air can be avoided through 1.5-2.5KW power laser welding and argon intervention, the oxidation caused by high temperature in the welding area is avoided, the workpiece is ensured not to be deformed at high temperature, hydrogen cracking is avoided, and impurities in the molten pool can also be removed; the heat around the workpiece can be reduced during the welding process, the area affected by temperature is reduced, the weld reaches the optimal penetration, and the surface will not produce rust marks whether it is electrophoretic coating or electrostatic powder spraying because of less pollutants; the double mechanical person welding can be single person to carry out the cycle clamping welding, which greatly reduces the labor and equipment investment; and the welding tool can use different part styles, and the seat of the same vehicle model can be clamped arbitrarily, and the standard welding effect and strength can be achieved.

[0093] If the numerical range is disclosed in any of the technical solutions of the utility model disclosed above, the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that the preferred numerical range is only one of the many implementable values with more obvious technical effects or representative values. Because there are too many values, it is impossible to enumerate them, therefore, the utility model discloses only part of the values to illustrate the technical solutions of the utility model, and the values listed above should not constitute a limitation on the protection scope of the utility model.

Claims

1. A laser welding socket apparatus, characterized by, The utility model provides a welding tool assembly, which comprises a tool assembly fixing frame, a welding tool A and a welding tool B arranged on the tool assembly fixing frame, an argon arc welding machine and a laser welding machine arranged behind the tool assembly fixing frame, and a workpiece positioned and clamped on the welding tool A and the welding tool B.

2. A laser welding cup apparatus as defined in claim 1, wherein, The welding tool A comprises a welding tool body A, a left positioning mechanism A and a right positioning mechanism A arranged above both sides of the welding tool body A, and a front positioning mechanism A and a rear positioning mechanism A arranged above the front and rear parts of the welding tool body A.

3. A laser welding cup apparatus as defined in claim 2, wherein, The left positioning mechanism A comprises a left fixing plate A arranged above the welding tool body A, left positioning pins A and B arranged in the middle part of the left fixing plate A, a left clamping mechanism A and a left clamping mechanism B arranged on the front and rear parts of the left fixing plate A respectively, and a left clamping mechanism A and a left clamping mechanism B arranged on the front and rear parts of the left fixing plate A respectively, wherein the left clamping mechanism A and the left clamping mechanism B each comprise a left clamping jaw A and a left clamping jaw cylinder A arranged on the left clamping jaw A to drive the left clamping jaw A to swing; the left fixing plate A is connected to the tool assembly fixing frame through two slide rails A, the slide rails A are fixed to the surface of the tool assembly fixing frame, a slide groove arranged below the left fixing plate A is matched with the slide rails A, the left fixing plate A is driven by a left top cylinder A to move leftward and rightward along the slide rails A, a hand pushing clamping structure A is arranged in front of the left fixing plate A, the hand pushing clamping structure A comprises a hand pushing clamping fixed plate A, a hand pushing clamping handle A and a hand pushing clamping short rod A, the lower end of the hand pushing clamping handle A is hinged to the hand pushing clamping fixed plate A, the middle part of the hand pushing clamping handle A is hinged to the hand pushing clamping short rod A, the other end of the hand pushing clamping short rod A is hinged to the left fixing plate A, and the hand pushing clamping fixed plate A is fixed to the tool assembly fixing frame; the right positioning mechanism is the same as the left positioning mechanism.

4. A laser welding cup apparatus as defined in claim 2, wherein, The rear positioning mechanism A comprises a rear pipe frame positioning block A, a rear pipe frame positioning groove A arranged above the rear pipe frame positioning block A, and a rear pipe frame clamping mechanism A arranged in front of the rear pipe frame positioning block A to press the workpiece tightly on the rear pipe frame positioning groove A; the rear pipe frame clamping mechanism A comprises a rear pipe frame clamping jaw A and a rear pipe frame clamping jaw cylinder A arranged on the rear pipe frame clamping jaw A to drive the rear pipe frame clamping jaw A to swing.

5. A laser welding cup apparatus as defined in claim 2, wherein, The front positioning mechanism A comprises a front fixing frame A, front positioning pins A, B and C arranged on the front fixing frame A, a front positioning block A arranged behind the front fixing frame A, a front clamping mechanism A arranged behind the front positioning block A, and a front clamping mechanism B and a front clamping mechanism C arranged in front of the front positioning pins A and B respectively; the front clamping mechanism A, B and C each comprise a front clamping jaw A and a front clamping jaw cylinder A arranged on the front clamping jaw A to drive the front clamping jaw A to swing and clamp the workpiece.

6. A laser welding apparatus as defined in claim 1, wherein, The welding tool B comprises a welding tool body B, a left positioning mechanism B and a right positioning mechanism B arranged above both sides of the welding tool body B, a front positioning mechanism B and a rear positioning mechanism B arranged above the front and rear parts of the welding tool body B respectively, the left positioning mechanism B, the right positioning mechanism B, the front positioning mechanism B and the rear positioning mechanism B are used to clamp and position the workpiece, the front left clamping mechanism B and the front right clamping mechanism B are arranged on both sides of the front part of the welding tool body B respectively, and the rear left clamping mechanism B and the rear right clamping mechanism B are arranged on both sides of the rear part of the welding tool body B respectively.

7. A laser welding cup apparatus as defined in claim 6, wherein, The left positioning mechanism B comprises a left fixed plate B, a left positioning pin fixing mechanism B, a left positioning pin C and a left positioning pin D arranged on the inner side of the left fixed plate B, the left positioning pin fixing mechanism B, the left positioning pin C and the left positioning pin D are arranged in sequence from front to back along the left fixed plate, the left positioning pin fixing mechanism B comprises a left movable positioning pin B and a left movable positioning pin top cylinder B used to drive the left movable positioning pin B to stretch and retract, the left fixed plate B is provided with a left pressing clamping mechanism C and a left pressing clamping mechanism D used to clamp the workpiece, the left pressing clamping mechanism C and the left pressing clamping mechanism D both comprise a left clamping jaw C and a left clamping jaw cylinder C used to drive the left clamping jaw C to swing, the left fixed plate B is connected with the tool assembly fixing frame through two slide rails C, the slide rail C is fixed on the surface of the tool assembly fixing frame, a slide groove C used to cooperate with the slide rail C is arranged below the left fixed plate B, the left fixed plate B is driven by the left top cylinder C to move left and right along the slide rail C, a hand pushing clamping structure B is arranged on the outer side of the left fixed plate B, the hand pushing clamping structure B comprises a hand pushing clamping fixed plate B, a hand pushing clamping push handle B and a hand pushing clamping short rod B, the lower end of the hand pushing clamping push handle B is hinged to the hand pushing clamping fixed plate B, the middle part of the hand pushing clamping push handle B is hinged to the hand pushing clamping short rod B, the other end of the hand pushing clamping short rod B is hinged to the left fixed plate B, and the hand pushing clamping fixed plate B is fixed on the tool assembly fixing frame.

8. A laser welding apparatus as defined in claim 6, wherein, The right positioning mechanism B comprises a right fixed plate B, a right positioning pin fixing mechanism one, a right positioning pin fixing mechanism two, a right positioning pin C and a right positioning pin D arranged inside the right fixed plate B, the right positioning pin fixing mechanism one and the right positioning pin fixing mechanism two each comprise a right movable positioning pin and a right movable positioning pin top cylinder B used to drive the right movable positioning pin to stretch and retract; the right fixed plate B is provided with a right pressing clamping mechanism C, a right pressing clamping mechanism D and a right pressing mechanism E used to clamp the workpiece, the right pressing clamping mechanism C, the right pressing clamping mechanism D and the right pressing mechanism E each comprise a right clamping jaw C and a right clamping jaw cylinder C used to drive the right clamping jaw C to swing; the right fixed plate B is connected with the tool assembly fixing frame through two slide rails D, the slide rails D are fixed on the surface of the tool assembly fixing frame, a slide groove D used to cooperate with the slide rails D is arranged below the left fixed plate B, the right fixed plate B is driven by a right top cylinder C arranged outside the right fixed plate B to move left and right along the slide rails D; a hand pushing clamping structure C is arranged outside the right fixed plate B, the hand pushing clamping structure C comprises a hand pushing clamping fixed plate C, a hand pushing clamping push handle C and a hand pushing clamping short rod C, the lower end of the hand pushing clamping push handle C is hinged to the hand pushing clamping fixed plate C, the middle part of the hand pushing clamping push handle C is hinged to the hand pushing clamping short rod C, the other end of the hand pushing clamping short rod C is hinged to the right fixed plate B, and the hand pushing clamping fixed plate C is fixed on the tool assembly fixing frame.

9. A laser welding cup apparatus as defined in claim 6, wherein, The front positioning mechanism B comprises a front frame and a positioning pin one, a positioning pin two, a positioning pin three, a positioning pin four, a positioning pin five and a positioning pin six arranged on the front frame, the positioning pin four and the positioning pin five are driven to stretch and retract by a positioning pin top cylinder arranged at the lower part in an inclined manner, and the rear part of the front frame is provided with a pressing clamping mechanism one and a pressing clamping mechanism two used to press the workpiece; the pressing clamping mechanism one and the pressing clamping mechanism two each comprise a front clamping jaw B and a front clamping jaw B cylinder used to drive the front clamping jaw B to swing and clamp; the rear positioning mechanism B comprises a rear pipe frame positioning block B and a rear pipe frame positioning block B groove arranged above the rear pipe frame positioning block B, and the rear part of the rear pipe frame positioning block B is provided with a rear pipe frame B clamping mechanism; the rear pipe frame B clamping mechanism comprises a rear pipe frame B clamping jaw and a rear pipe frame B clamping cylinder used to drive the rear pipe frame B clamping jaw to swing and clamp the workpiece.

10. A laser welding cup apparatus as defined in claim 6, wherein, The front left clamping mechanism B comprises a front left foot support positioning block B and two front left foot support fixing pins arranged on the front left foot support positioning block B, and a front left foot support pressing and clamping mechanism is arranged beside the front left foot support positioning block B to clamp the workpiece; the rear left clamping mechanism B comprises a rear left foot support positioning block B and two rear left foot support movable pins arranged on the rear left foot support positioning block B, the two rear left foot support movable pins are driven to extend and retract by a rear left foot support movable pin air cylinder, and a rear left foot support pressing and clamping mechanism is arranged in front of and behind the rear left foot support positioning block B to clamp the workpiece; the front right clamping mechanism B comprises a front right positioning block B and a profiling positioning groove arranged on the front right positioning block B, two front right top cylinder mechanisms are arranged beside the front right positioning block B to limit the workpiece, the front right top cylinder mechanism comprises a front right positioning pin and a front right top cylinder for driving the front right positioning pin to extend and retract; the rear right clamping mechanism B comprises a rear right foot support positioning block B and two rear right foot support movable pins arranged on the rear right foot support positioning block B, the two rear right foot support movable pins are driven to extend and retract by a rear right foot support movable pin air cylinder, and a rear right foot support pressing and clamping mechanism is arranged in front of and behind the rear right foot support positioning block B to clamp the workpiece; the front left foot support pressing and clamping mechanism, the rear left foot support pressing and clamping mechanism and the rear right foot support pressing and clamping mechanism all comprise a foot support clamping jaw and a foot support clamping jaw air cylinder for driving the foot support clamping jaw to swing and clamp the workpiece.

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