CN117381136A - Linear friction welding device for cuboid workpiece and control method - Google Patents
Linear friction welding device for cuboid workpiece and control method Download PDFInfo
- Publication number
- CN117381136A CN117381136A CN202311555995.3A CN202311555995A CN117381136A CN 117381136 A CN117381136 A CN 117381136A CN 202311555995 A CN202311555995 A CN 202311555995A CN 117381136 A CN117381136 A CN 117381136A
- Authority
- CN
- China
- Prior art keywords
- clamping
- workpiece
- block
- wedge
- upsetting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 24
- 230000005284 excitation Effects 0.000 claims abstract description 21
- 238000006073 displacement reaction Methods 0.000 claims description 16
- 238000004904 shortening Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/123—Controlling or monitoring the welding process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
- B23K20/126—Workpiece support, i.e. backing or clamping
Abstract
The invention provides a linear friction welding device and a control method for a cuboid workpiece, wherein the device comprises an electrohydraulic excitation system, an electrohydraulic upsetting system and a clamping force control center; clamping devices are respectively arranged on the electrohydraulic excitation system and the electrohydraulic upsetting system; the clamping device comprises a first wedge block, a second wedge block, a clamping block, a supporting base and a linear driving device; the bottom of the clamping block is matched with the moving pair at the bottom of the supporting base, and the clamping block moves along the moving pair through the linear driving device; the first wedge block moves along the direction perpendicular to the moving direction of the clamping block in the process that the clamping block moves along the moving pair; in the process of moving the clamping block along the moving pair, enabling the second wedges on two sides to move in opposite directions along the direction perpendicular to the moving direction of the clamping block; and a workpiece to be machined is placed between the first wedge block and the second wedge block, and the workpiece to be machined is clamped in the process that the clamping block moves along the moving pair. The invention can effectively avoid the problem of welding defects caused by the workpiece clamping device in the linear friction welding process.
Description
Technical Field
The invention relates to the technical field of linear friction welding, in particular to a linear friction welding device for a cuboid workpiece and a control method thereof.
Background
The linear friction welding is a solid phase connection technology, and the quality of the welded joint is reliableLow manufacturing and using cost, and can weld dissimilar metals and non-revolving bodies. The linear friction welding equipment mainly applies linear reciprocating motion and upsetting pressure to the contact end surfaces of two workpieces through an electrohydraulic servo system to generate friction heat, so that materials in a contact area are softened, deformed, flowed and recrystallized to finish welding. If the clamping device of the weldment is designed poorly, the initial position of the welding joint of the workpiece is difficult to align, and the defects of incapability of centering the welded workpiece, irregular appearance, uneven heating of a welding seam area and the like are caused. The prior art provides a linear friction welding clamp, which is mainly used for restraining the degrees of freedom of the vibration direction and the top end direction of a cuboid workpiece through a moving end upper and lower clamp and a channel stop block, but the left side and the right side of the cuboid workpiece are not provided with corresponding clamping devices. The prior art also discloses a method for fixing the parts to be welded, which is suitable for linear friction welding. Although the fixture can effectively restrict the left side and the right side of the workpiece, a plurality of spherical bulges are required to be designed, and the machining is complex. When the electrohydraulic excitation system and the electrohydraulic upsetting system do not start to work, the vibrating workpiece and the upsetting workpiece are completely aligned in an initial state, when the electrohydraulic excitation system starts to work, the vibrating workpiece moves up and down by a certain amplitude in an ideal state, the upsetting workpiece receives axial upsetting force from the electrohydraulic upsetting system, the upsetting workpiece does not move in the vertical direction under the action of a clamp, and in the ideal state, the position of the upsetting workpiece in the vertical direction is always unchanged along with the change of working time; in practice, the upsetting workpiece is subjected to a great friction force F in the vertical direction f And therefore the upsetting workpiece inevitably moves up and down in the vertical direction.
The reason that vertical movement of the upsetting workpiece occurs is that the clamping force of the clamp is insufficient, but the plow effect cannot be formed due to the fact that the clamping force is too large, so that the center material of the weldment is difficult to remove, the amplitude of the vertical movement of the upsetting workpiece is easily increased due to the fact that the clamping force is too small, the welding heat is insufficient, the mechanical property of the weldment joint and the stability of the axial dimensional accuracy are affected, and therefore reasonable clamping force needs to be controlled.
The linear friction welding equipment mainly applies load to the contact surface of the vibrating workpiece and the upsetting workpiece through the electrohydraulic excitation system and the electrohydraulic upsetting system, so that the contact surface material is softened, deformed, flowed and recrystallized to finish welding. Conventional linear friction welding clamps apply a clamping force primarily in the direction of vibration of the weld. However, the lack of effective clamping means on both sides of the workpiece is extremely prone to misalignment of the vibrating and upsetting workpieces.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a linear friction welding device for a cuboid workpiece and a control method thereof, wherein a groove is arranged in a clamping block, the top surface of the groove is matched with a wedge surface of a first wedge block, and the first wedge block is enabled to move along a direction perpendicular to the moving direction of the clamping block in the moving process of the clamping block along a moving pair; the side surfaces of the grooves are respectively matched with the wedge surfaces of the second wedges, so that the second wedges on two sides move in opposite directions along the direction perpendicular to the moving direction of the clamping blocks in the moving process of the clamping blocks along the moving pair; and a workpiece to be machined is placed between the first wedge block and the second wedge block, the workpiece to be machined is clamped in the moving process of the clamping block along the moving pair, and the 2 wedge blocks are utilized to apply clamping forces in the vertical direction and the transverse direction to the cuboid workpiece. The control method for the linear friction welding device for the cuboid workpiece can effectively avoid the problem of welding defects caused by the workpiece clamping device in the linear friction welding process.
The present invention achieves the above technical object by the following means.
A linear friction welding device for cuboid workpieces comprises an electrohydraulic excitation system, an electrohydraulic upsetting system and a clamping force control center;
clamping devices are respectively arranged on the electrohydraulic excitation system and the electrohydraulic upsetting system and are used for clamping a workpiece to be processed; the clamping device comprises a first wedge block, a second wedge block, a clamping block, a supporting base and a linear driving device;
the bottom of the clamping block is matched with the moving pair at the bottom of the supporting base, sliding blocks are arranged on two sides of the clamping block and are positioned in a fourth groove on the side surface of the supporting base, the sliding blocks are connected with the linear driving device, and the clamping block is enabled to move along the moving pair through the linear driving device;
the clamping block is internally provided with a groove, the top surface of the groove is matched with the wedge surface of the first wedge block, and the first wedge block is enabled to move along the direction perpendicular to the moving direction of the clamping block in the moving process of the clamping block along the moving pair; the side surfaces of the grooves are respectively matched with the wedge surfaces of the second wedges, so that the second wedges on two sides move in opposite directions along the direction perpendicular to the moving direction of the clamping blocks in the moving process of the clamping blocks along the moving pair; a workpiece to be machined is placed between the first wedge block and the second wedge block, and the workpiece to be machined is clamped in the process that the clamping block moves along the moving pair; the clamping force control center is used for adjusting the clamping force of the clamping device.
Further, the groove of the clamping block comprises a first inclined plane and two second inclined planes, the top surface of the groove is the first inclined plane, the second inclined planes are symmetrically arranged on the two side surfaces of the groove respectively, and the first inclined plane is matched with the first wedge block; the second inclined surfaces with two symmetrical side surfaces are respectively matched with the second wedge blocks.
Further, a third inclined plane is arranged at the upper part of the first wedge block, the third inclined plane is in contact with the first inclined plane, and the height of the third inclined plane is gradually decreased along the clamping direction of the clamping block; the first wedge block is connected with the support base sliding pair.
Further, a fourth inclined plane is arranged on one side of the second wedge block, the fourth inclined plane is in contact with the second inclined plane, and the width of the third inclined plane is gradually decreased along the clamping direction of the clamping block; the second wedge block is connected with the support base sliding pair.
Further, the device also comprises an image equipment device and a displacement sensor; the displacement sensor is used for detecting the moving distance of the clamping device on the electro-hydraulic upsetting system; the image equipment device is used for identifying and feeding back the offset of the workpiece to be processed clamped by the clamping device on the electrohydraulic excitation system and the offset of the workpiece to be processed clamped by the clamping device on the electrohydraulic upsetting system; the clamping force control center adjusts the clamping force of the clamping device according to the detection values of the image equipment device and the displacement sensor.
A control method for a linear friction welding device for a rectangular parallelepiped workpiece, comprising the steps of:
the electrohydraulic excitation system is provided with a first clamping device which passes through an initial clamping force f 0 Clamping a vibrating workpiece, and controlling an electrohydraulic excitation system to enable the vibrating workpiece to vibrate up and down;
the electro-hydraulic upsetting system is provided with a second clamping device which passes through an initial clamping force f 0 Clamping the upsetting workpiece; controlling the electrohydraulic upsetting system to axially feed the second clamping device, and setting the moment as t when the displacement sensor detects that the axial shortening amount of the upsetting workpiece linearly increases for 1s in the axial feeding process 1 Time; when the rate of change of the axial shortening amount fed back by the displacement sensor starts to decrease, the time is set as t 2 Time;
the clamping force control center controls the linear driving device of the second clamping device to be at t 1 To t 2 Gradient increases between moments to clamping force; reach t 2 After the moment, the clamping force control center controls the linear driving device of the second clamping device to keep t 2 And (5) clamping force at any time until friction welding is completed between the vibrating workpiece and the upsetting workpiece.
Further, the clamping force control center controls the linear driving device of the second clamping device at t 1 To t 2 The clamping force is increased by 5% -10% every delta t time interval between the moments.
Further, the interval Δt time is 1 to 1.5s.
The invention has the beneficial effects that:
1. according to the linear friction welding device for the cuboid workpiece, the groove is formed in the clamping block, the top surface of the groove is matched with the wedge surface of the first wedge block, and the first wedge block moves along the direction perpendicular to the moving direction of the clamping block in the moving process of the clamping block along the moving pair; the side surfaces of the grooves are respectively matched with the wedge surfaces of the second wedges, so that the second wedges on two sides move in opposite directions along the direction perpendicular to the moving direction of the clamping blocks in the moving process of the clamping blocks along the moving pair; and a workpiece to be machined is placed between the first wedge block and the second wedge block, the workpiece to be machined is clamped in the moving process of the clamping block along the moving pair, and the 2 wedge blocks are utilized to apply clamping forces in the vertical direction and the transverse direction to the cuboid workpiece.
2. The linear friction welding device for the cuboid workpiece controls the linear driving device of the second clamping device to be at t through the clamping force control center 1 To t 2 The clamping force is increased by 5% -10% every Δt time between the moments, so that the problem of welding defects caused by the workpiece clamping device in the linear friction welding process can be effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described, in which the drawings are some embodiments of the invention, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic view of a linear friction welding device for rectangular workpieces according to the present invention.
Fig. 2 is an assembled view of a three-dimensional view of the clamping device according to the present invention.
Fig. 3 is a three-dimensional view of a linear clamp block according to the present invention.
Fig. 4 is a three-dimensional view of a first wedge according to the present invention.
Fig. 5 is a third oblique position diagram according to the present invention.
Fig. 6 is a three-dimensional view of a second wedge according to the present invention.
Fig. 7 is a fourth bevel position diagram according to the present invention.
Fig. 8 is a three-dimensional view of a support base according to the present invention.
Fig. 9 is a contact assembly view of the clamping block and the first wedge according to the present invention.
Fig. 10 is a contact assembly view of the clamping block and the second wedge according to the present invention.
Fig. 11 is a side view of an assembly of the clamping device of the present invention.
Fig. 12 is a cross-sectional view A-A of fig. 11.
Fig. 13 is a front view of the assembly of the clamping device of the present invention.
Fig. 14 is a B-B cross-sectional view of fig. 13.
FIG. 15 is a graph of clamping force as a function of time.
FIG. 16 is a graph of axial shortening of an upset workpiece as a function of time.
Fig. 17 is a flowchart of a control method according to the present invention.
In the figure:
1-vibrating a workpiece; 2-upsetting the workpiece; 3-clamping blocks; 3A-a first bevel; 3B-vertical plane; 3C-a second bevel; 3D-sliders; 3E-dovetail slider; 4-a first wedge; 4A-a first groove; 4B-a third ramp; 4C-a second groove; 5-a second wedge; 5A-a third groove; 5B-a fourth ramp; 6-supporting a base; 6A-dovetail groove; 6B-fourth grooves; 6C-longitudinal guide rails; 6D-a transverse guide rail; 7-a linear drive; 7A-a piston rod; 8-clamping means; 10-a displacement sensor; 11-high speed camera; 12-a clamping force control center; 13-an electrohydraulic excitation system; 14-an electrohydraulic upsetting system; 15-mark points.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1, the linear friction welding device for the cuboid workpiece comprises an electrohydraulic excitation system 13, an electrohydraulic upsetting system 14 and a clamping force control center 12; the electrohydraulic excitation system 13 is provided with a first clamping device for clamping the vibrating workpiece 1, and the electrohydraulic tip system 14 is provided with a second clamping device for clamping the upsetting workpiece 2; the first clamping device and the second clamping device have the same structure;
as shown in fig. 2, a first clamping device is specifically described below, which includes a first wedge 4 and a second wedge 5, a clamping block 3, a support base 6, and a linear driving device 7;
as shown in fig. 3 and 8, the bottom of the clamping block 3 is provided with parallel dovetail-shaped sliding blocks 3E, the bottom of the corresponding supporting base 6 is provided with dovetail grooves 6A, and the dovetail-shaped sliding blocks 3E can be movably installed in the dovetail grooves 6A, that is, the bottom of the clamping block 3 is matched with a moving pair at the bottom of the supporting base 6. The two sides of the clamping block 3 are provided with sliding blocks 3D, the sliding blocks 3D are positioned in a fourth groove 6B on the side surface of the supporting base 6, the sliding blocks 3D are connected with a linear driving device 7, and the clamping block 3 moves along a moving pair through the linear driving device 7; the moving direction of the moving pair is defined herein as the X direction. A groove is formed in the clamping block 3, the top surface of the groove is matched with the wedge surface of the first wedge block 4, and the first wedge block 4 moves along the Z direction perpendicular to the X direction in the process of moving the clamping block 3 along the X direction; the side surfaces of the grooves are respectively matched with the wedge surfaces of the second wedge blocks 5, and the second wedge blocks 5 on the two sides are made to move in opposite directions along the Y direction perpendicular to the X direction in the process of moving the clamping block 3 along the X direction; a workpiece to be machined is placed between the first wedge block 4 and the second wedge block 5, and the workpiece to be machined is clamped in the process that the clamping block 3 moves along the moving pair; the clamping force control center 12 is used to adjust the clamping force of the clamping device.
As shown in fig. 3, the groove of the clamping block 3 includes a first inclined plane 3A, two vertical planes 3B and two second inclined planes 3C, the top surface of the groove is the first inclined plane 3A, two side surfaces of the groove are vertical planes 3B, the two vertical planes 3B are respectively located at two sides of the first inclined plane 3A, and the two vertical planes 3B are parallel to each other; the bottom of each vertical surface 3B is provided with a second inclined surface 3C, and the two second inclined surfaces 3C are symmetrically arranged; as shown in fig. 9, 12 and 13, the first inclined surface 3A is engaged with the first wedge 4; as shown in fig. 9, 10, 11 and 14, the second inclined surfaces 3C with symmetrical sides are respectively matched with the second wedge 5.
As shown in fig. 4 and 5, a third inclined plane 4B is provided at the upper part of the first wedge 4, the third inclined plane 4B contacts with the first inclined plane 3A, the height of the third inclined plane 4B decreases along the clamping direction of the clamping block 3, and the inclination angle of the first inclined plane 3A is consistent with that of the third inclined plane 4B; the side surface of the first wedge block 4 is a vertical surface and is in clearance fit with two vertical surfaces 3B of the clamping block 3. The first wedge block 4 is connected with a sliding pair of the support base 6. The first wedge block 4 is provided with two first grooves 4A and two second grooves 4C which are parallel to each other, the support base 6 is provided with two longitudinal guide rails 6C, and the longitudinal guide rails 6C are positioned in the first grooves 4A to form sliding pair connection. The second groove 4C may be placed therein with a workpiece to be machined, so as to ensure that the workpiece to be machined can be clamped in the second groove 4C, the width of the second groove 4C is slightly greater than the width of the workpiece to be machined by 1-3 mm, and the sum of the heights of the second groove 4C and the second wedge 5 is smaller than the height of the workpiece to be machined.
As shown in fig. 6 and 7, a fourth inclined plane 5B is provided on one side of the second wedge 5, the fourth inclined plane 5B contacts with the second inclined plane 3C, and the width of the third inclined plane 4B decreases along the clamping direction of the clamping block 3; the second wedge block 5 is connected with a sliding pair of the supporting base 6. The first wedge block 4 is provided with a third groove 5A, the support base 6 is provided with two transverse guide rails 6D, and the longitudinal guide rails 6D are positioned in the third groove 5A to form sliding pair connection. As shown in fig. 10 and 14, the 2 second wedges 5 are respectively located at two sides of the groove of the clamping block 3, the fourth inclined surfaces 5B at one side of the 2 second wedges 5 are respectively contacted with the two second inclined surfaces 3C, and the second wedges 5 at two sides are moved in the opposite direction along the Y direction during the movement of the clamping block 3 along the X direction, taking fig. 14 as an example, the upper second wedges 5 are moved downwards along the Y direction, and the lower second wedges 5 are moved upwards along the Y direction, so that the 2 second wedges 5 are ensured to simultaneously clamp the workpiece to be machined.
As shown in fig. 8, the supporting base 6 is composed of three vertical surfaces and a base, the vertical surfaces on both sides are provided with fourth grooves 6B, the base is provided with two dovetail grooves 6A, the sliding block 3D is slidably connected with the fourth grooves 6B, the dovetail-shaped sliding block 3E is slidably connected with the dovetail grooves 6A, two mutually parallel longitudinal guide rails 6C and two transverse guide rails 6D positioned on the same straight line are arranged on the third vertical surface, the longitudinal guide rails 6C are slidably connected with the first grooves 4A, and the two transverse guide rails 6D are slidably connected with the third grooves 5A of the two second wedges 5 respectively.
As shown in fig. 1, a high-speed camera 11 and a displacement sensor 10 are further included; the displacement sensor 10 is used for detecting the moving distance of a clamping device on the electro-hydraulic upsetting system 14; the high-speed camera 11 is used for identifying and feeding back offset of the vibrating workpiece 1 clamped by the clamping device on the electrohydraulic excitation system 13 and the upsetting workpiece 2 clamped by the clamping device on the electrohydraulic upsetting system 14, one side of the vibrating workpiece 1 and one side of the upsetting workpiece 2 are respectively provided with a marking point 15, and the high-speed camera 11 acquires offset of the marking point 15 on the vibrating workpiece 1 and the marking point 15 on the upsetting workpiece 2. The clamping force control center 12 adjusts the clamping force of the clamping device on the electro-hydraulic upsetting system 14 according to the detection values of the high-speed camera 11 and the displacement sensor 10.
As shown in fig. 17, the control method of the linear friction welding device for rectangular parallelepiped workpieces according to the present invention includes the steps of:
the electrohydraulic excitation system 13 is provided with a first clamping device which is subjected to an initial clamping force f 0 Clamping the vibrating workpiece 1, and controlling the electrohydraulic excitation system 13 to enable the vibrating workpiece 1 to vibrate up and down; the electrohydraulic upsetting system 14 is provided with a second clamping device which is actuated by an initial clamping force f 0 Clamping the upsetting workpiece 2;
as shown in fig. 16, the linear friction welding process is mainly divided into 4 stages, namely a contact stage, a transition stage, a stabilization stage and an upsetting stage; the electro-hydraulic upsetting system 14 pushes the upsetting workpiece 2 to the vibrating workpiece 1 vibrating at high frequency until the upsetting workpiece 2 contacts the vibrating workpiece 1, during which the axial shortening amount of the upsetting workpiece 2 is kept unchanged; along with the gradual complete contact of the vibration workpiece 1 and the upsetting workpiece 2, friction force is formed by the contact of the surfaces of the two workpieces to be welded to start to heat the material rapidly, and the local temperature reaches the temperature required by welding, at the moment, the axial shortening amount of the upsetting workpiece 2 starts to change, but the change is unstable, and the stage is a transition stage; along with plastic deformation of the material at the interface of the contact surface of the vibration workpiece 1 and the upsetting workpiece 2, the upsetting workpiece 2 axially shortens along the upsetting direction, the welding interface is in a thermal balance state at the stage, and the axial shortening amount of the weldment in unit time is kept unchanged as a stable stage; when the upsetting process is entered, the amount of shortening per unit time of the weldment remains unchanged after the instantaneous reduction occurs.
The clamping force of the first clamping device is always kept at f during the whole working process 0 The clamping force of the second clamping device needs to be increased in gradient in the stable phase, in particular:
controlling the electrohydraulic upsetting system 14 to axially feed the second clamping device, and setting the moment as t when the displacement sensor 10 detects that the axial shortening of the upsetting workpiece 2 linearly increases for 1s for the first time during the axial feeding 1 Time; when the rate of change of the axial shortening amount fed back by the displacement sensor 10 starts to decrease, this time is set to t 2 Time;
in the clamping force controlThe heart 12 controls the linear drive 7 of the second clamping device at t 1 To t 2 Every interval delta t between the moments increases by 5% -10% of clamping force, and the interval delta t is 1-1.5 s; reach t 2 After the moment, the clamping force control center 12 controls the linear drive 7 of the second clamping device to maintain t 2 And clamping force is carried out at any time until friction welding is completed between the vibrating workpiece 1 and the upsetting workpiece 2.
As shown in fig. 15, at t 1 The clamping force control center 12 gradually increases the clamping force by 5 to 10 percent and keeps the clamping force for 1 to 1.5 seconds at the moment; in examples t 1 To t 2 The clamping force is increased 3 times between the moments, and t is calculated according to the increase of 10 percent 2 The clamping force at the moment is 1.1 3 f 0 。
The high speed camera 11 may assist the clamp force control center 12 in determining whether t is reached 1 And t 2 。
F can be determined using the high speed camera 11 0 Is of a size of (a) and (b). By processing the sample, using the video taken by the high-speed camera 11, determining the minimum value of the amplitude of the upsetting workpiece 2 in the sinusoidal motion in the vertical direction in the stable phase by observing the number of pixels of the variation of the mark point 15 in the video, and recording the corresponding optimal clamping force F at the moment j When the amplitude of the oscillation of the upsetting workpiece 2 is minimum, the frictional heat generated by the movement of the vibrating workpiece 1 is maximum and most stable;
clamping force f 0 And (3) preference: at a clamping force F j Is provided with a plurality of clamping forces of 96% F j 、97％F j 、98％F j 、99％F j 、F j 、101％F j 、102％F j 、103％F j 、104％F j The constant clamping force linear friction welding test is carried out by utilizing different clamping forces, the mechanical property and the axial dimension precision of a linear friction welding test piece under different clamping forces are tested, and the clamping force f with the most stable weldment performance is selected 0 As an initial clamping force for the rectangular parallelepiped workpiece.
It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. A linear friction welding device for cuboid workpieces is characterized by comprising an electrohydraulic excitation system (13), an electrohydraulic upsetting system (14) and a clamping force control center (12);
clamping devices are respectively arranged on the electrohydraulic excitation system (13) and the electrohydraulic upsetting system (14) and are used for clamping a workpiece to be processed; the clamping device comprises a first wedge block (4) and a second wedge block (5), a clamping block (3), a supporting base (6) and a linear driving device (7);
the bottom of the clamping block (3) is matched with a moving pair at the bottom of the supporting base (6), sliding blocks (3D) are arranged on two sides of the clamping block (3), the sliding blocks (3D) are positioned in fourth grooves (6B) on the side face of the supporting base (6), the sliding blocks (3D) are connected with a linear driving device (7), and the clamping block (3) moves along the moving pair through the linear driving device (7);
a groove is formed in the clamping block (3), the top surface of the groove is matched with the wedge surface of the first wedge block (4), and the first wedge block (4) moves along the direction perpendicular to the moving direction of the clamping block (3) in the moving process of the clamping block (3) along the moving pair; the side surfaces of the grooves are respectively matched with the wedge surfaces of the second wedges (5), and the second wedges (5) at the two sides move in opposite directions along the direction perpendicular to the moving direction of the clamping blocks (3) in the moving process of the clamping blocks (3) along the moving pair; a workpiece to be machined is placed between the first wedge block (4) and the second wedge block (5), and the workpiece to be machined is clamped in the process that the clamping block (3) moves along the moving pair; the clamping force control center (12) is used for adjusting the clamping force of the clamping device.
2. The linear friction welding device for cuboid workpieces according to claim 1, wherein the groove of the clamping block (3) comprises a first inclined surface (3A) and two second inclined surfaces (3C), the top surface of the groove is the first inclined surface (3A), the two side surfaces of the groove are respectively symmetrically provided with the second inclined surfaces (3C), and the first inclined surfaces (3A) are matched with the first wedge block (4); the second inclined planes (3C) with symmetrical two side surfaces are respectively matched with the second wedge blocks (5).
3. Linear friction welding device for cuboid workpieces according to claim 2, characterized in that the upper part of the first wedge (4) is provided with a third bevel (4B), the third bevel (4B) being in contact with the first bevel (3A), the third bevel (4B) decreasing in height in the clamping direction of the clamping block (3); the first wedge block (4) is connected with a sliding pair of the supporting base (6).
4. The linear friction welding device for rectangular parallelepiped workpieces according to claim 2, characterized in that a fourth inclined surface (5B) is provided on one side of the second wedge (5), the fourth inclined surface (5B) is in contact with the second inclined surface (3C), and the width of the third inclined surface (4B) decreases in the clamping direction of the clamping block (3); the second wedge block (5) is connected with the sliding pair of the supporting base (6).
5. Linear friction welding device for cuboid workpieces according to claim 1, further comprising image equipment means and a displacement sensor (10); the displacement sensor (10) is used for detecting the moving distance of the clamping device on the electro-hydraulic upsetting system (14); the image equipment device is used for identifying and feeding back the offset of the workpiece to be processed clamped by the clamping device on the electrohydraulic excitation system (13) and the workpiece to be processed clamped by the clamping device on the electrohydraulic upsetting system (14); the clamping force control center (12) adjusts the clamping force of the clamping device on the electro-hydraulic upsetting system (14) according to the detection values of the image equipment device and the displacement sensor (10).
6. A control method of a linear friction welding apparatus for rectangular parallelepiped workpieces according to claim 5, comprising the steps of:
the electrohydraulic excitation system (13) is provided with a first clamping device which is driven by an initial clamping force f 0 Clamping the vibrating workpiece (1), and controlling the electrohydraulic excitation system (13) to enable the vibrating workpiece (1) to vibrate up and down;
the electrohydraulic upsetting system (14) is provided with a second clamping device which is actuated by an initial clamping force f 0 Clamping the upsetting workpiece (2); controlling the electrohydraulic upsetting system (14) to axially feed the second clamping device, and setting the moment as t when the displacement sensor (10) detects that the axial shortening amount of the upsetting workpiece (2) linearly increases for the first time within 1s in the axial feeding process 1 Time; when the rate of change of the axial shortening amount fed back by the displacement sensor (10) starts to decrease, the time is set as t 2 Time;
the clamping force control center (12) controls the linear driving device (7) of the second clamping device at t 1 To t 2 Gradient increases between moments to clamping force; reach t 2 After the moment, the clamping force control center (12) controls the linear driving device (7) of the second clamping device to keep t 2 And (3) clamping force at any time until friction welding is completed between the vibrating workpiece (1) and the upsetting workpiece (2).
7. The control method for a linear friction welding device for rectangular parallelepiped workpieces as claimed in claim 6, wherein said clamping force control center (12) controls the linear driving device (7) of the second clamping device at t 1 To t 2 The clamping force is increased by 5% -10% every delta t time interval between the moments.
8. The control method for a linear friction welding apparatus for rectangular parallelepiped workpieces as claimed in claim 7, wherein the interval Δt time is 1 to 1.5s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311555995.3A CN117381136A (en) | 2023-11-21 | 2023-11-21 | Linear friction welding device for cuboid workpiece and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311555995.3A CN117381136A (en) | 2023-11-21 | 2023-11-21 | Linear friction welding device for cuboid workpiece and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117381136A true CN117381136A (en) | 2024-01-12 |
Family
ID=89470226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311555995.3A Pending CN117381136A (en) | 2023-11-21 | 2023-11-21 | Linear friction welding device for cuboid workpiece and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117381136A (en) |
-
2023
- 2023-11-21 CN CN202311555995.3A patent/CN117381136A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107708911B (en) | Friction stir welding device and friction stir welding method | |
| EP2639006B1 (en) | Friction stir welding device | |
| CN110480157B (en) | Laser welding method and system for continuous variable cross-section workpiece | |
| EP2703111A1 (en) | Friction bonding method and bonding structure | |
| JP6701643B2 (en) | Linear friction welding device and linear friction welding method | |
| KR102438105B1 (en) | friction stir welding device | |
| KR20120111945A (en) | Method of an apparatus for friction stir spot welding with adapted number of shoulders with respect to thicknesses of plates to be spot welded | |
| JP3261433B2 (en) | Joining apparatus and joining method | |
| US7556187B2 (en) | Method of manufacturing cylindrical body, friction stir welding method, and friction stir welding device | |
| CN117381136A (en) | Linear friction welding device for cuboid workpiece and control method | |
| US7815094B2 (en) | Method of manufacturing cylindrical body, and friction stir welding method | |
| KR101821523B1 (en) | Apparatus and method for fusing using heating and vibration | |
| JP4294451B2 (en) | Semiconductor bonding equipment | |
| JP5987396B2 (en) | Friction stir welding equipment | |
| JP5127867B2 (en) | Fixing rebar processing device and method of using the same | |
| CN109014558B (en) | Method for improving shortening precision of linear friction welding | |
| US10562128B2 (en) | Linear friction welding apparatus | |
| CN113370235B (en) | Automatic milling device for weld reinforcement, path generation method and using method | |
| JP3845322B2 (en) | Weighting method using voice coil motor, component mounting apparatus using the same, and voice coil motor used therefor | |
| CN109202263A (en) | A kind of linear friction welding method | |
| JP4690288B2 (en) | Laser processing apparatus and laser processing method | |
| JP6564511B1 (en) | Friction stir welding apparatus and friction stir welding method | |
| JP6553791B1 (en) | Friction stir welding apparatus and friction stir welding method | |
| JP7142797B1 (en) | Friction stir welding apparatus and friction stir welding method | |
| JP2023147704A (en) | Friction stirring joining device and position correction method for join line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |