CN116967582A - Single-sided spot welding device and spot welding control method thereof - Google Patents
Single-sided spot welding device and spot welding control method thereof Download PDFInfo
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- CN116967582A CN116967582A CN202310911930.1A CN202310911930A CN116967582A CN 116967582 A CN116967582 A CN 116967582A CN 202310911930 A CN202310911930 A CN 202310911930A CN 116967582 A CN116967582 A CN 116967582A
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- 238000003466 welding Methods 0.000 title claims abstract description 194
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000003825 pressing Methods 0.000 claims description 35
- 238000013507 mapping Methods 0.000 claims description 5
- 238000009957 hemming Methods 0.000 claims description 4
- 230000036316 preload Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000002184 metal Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001962 electrophoresis Methods 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
Abstract
The invention discloses a single-sided spot welding device and a spot welding control method thereof, wherein the single-sided spot welding device comprises a base, a spot welding mechanism and a clamping mechanism, the spot welding mechanism is arranged on the base, the spot welding mechanism comprises a positive electrode, a negative electrode, a transformer and a driving part, the positive electrode and the negative electrode are respectively and electrically connected with the transformer, the positive electrode is movably arranged on the base along the up-down direction, the driving part is in driving connection with the positive electrode and is used for driving the positive electrode to move along the up-down direction, an electrode cap is arranged at the free end of the positive electrode, the end part of the electrode cap is provided with a spherical surface, and the clamping mechanism is used for clamping and fixing a workpiece to be welded. According to the invention, by adopting the spherical electrode cap, the spherical surface can be fully contacted with the plane or the curved surface, so that the appearance problem caused by mismatching of the electrode and the surface of the workpiece is reduced, and the problem that the welding appearance of the conventional single-sided spot welding device cannot meet the requirement of mass production is solved.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a single-sided spot welding device and a spot welding control method thereof.
Background
The four-door two covers of the automobile not only require higher surface quality, but also must ensure that the four-door two covers always maintain good dimensional stability in the production, transportation, assembly and adjustment and whole automobile use processes. Based on the requirements, a reasonable process method is needed to be adopted after the edge wrapping of the inner and outer plates is completed so as to prevent the dimensional change caused by the movement of the inner and outer plates.
Compared with the other two process methods, the single-sided spot welding has the advantages of low cost, small occupied space and capability of being changed at the existing station. The anti-shifting process after the automobile door cover is covered does not require higher connection strength, but is only used as a supplementary process for covering the edge, so that the single-sided spot welding has wider application prospect when being used as a simple process supplementary means for the automobile door cover production process.
The existing single-sided spot welding technology is that an automatic welding single-sided spot welding gun driven by a cylinder or a robot single-sided spot welding gun is a conventional electrode cap with a front end face, under the condition, the current of welding spots with connection strength can be welded to be more than 6KA, the welding time is more than 5CYC, the thermal deformation of an outer plate of a door cover can be caused by the heat input quantity of the welding parameters, and the appearance of the door cover after electrophoresis is not in accordance with the quality requirement. Meanwhile, the electrode cap with the end face is generally not well matched with the shape of the part, so that the concave or convex pressing condition is caused, the appearance quality problem is caused, the difficulty is brought to the mass production of single-sided spot welding, and the popularization of the single-sided spot welding is influenced.
Disclosure of Invention
The invention mainly aims to provide a single-sided spot welding device and a spot welding control method thereof, and aims to solve the problem that the welding appearance of the conventional single-sided spot welding device cannot meet the requirement of mass production.
To achieve the above object, the present invention provides a single-sided spot welding apparatus, wherein the single-sided spot welding apparatus includes:
a base;
the spot welding mechanism is arranged on the base and comprises a positive electrode, a negative electrode, a transformer and a driving part, wherein the positive electrode and the negative electrode are respectively and electrically connected with the transformer, the positive electrode is movably arranged on the base along the up-down direction, the driving part is in driving connection with the positive electrode and is used for driving the positive electrode to move along the up-down direction, an electrode cap is arranged at the free end of the positive electrode, and the end part of the electrode cap is a spherical surface; the method comprises the steps of,
the clamping mechanism is used for clamping and fixing the workpiece to be welded.
Optionally, the clamping mechanism includes:
a mounting base;
the cushion block is detachably arranged on the mounting seat;
the pressing part is arranged above the cushion block and is movably arranged along the up-down direction and used for clamping a workpiece to be welded with the cushion block up and down; the method comprises the steps of,
and the air cylinder is in driving connection with the pressing part and is used for driving the pressing part to move up and down.
Optionally, the compressing part includes along the horizontal compression arm that extends and from compression arm lower extreme part protruding the compact heap of establishing, the compact heap corresponds the cushion sets up, the cylinder with the compression arm drive is connected, is used for the drive the compression arm is along upper and lower direction activity.
Optionally, the upper surface of the cushion block is obliquely arranged from one side to the other side, and the inclined surface is an arc surface for attaching and supporting the outer surface of the workpiece to be welded; and/or the number of the groups of groups,
after the clamping mechanism clamps the workpiece to be welded, the cushion block is at least partially higher than the workpiece to be welded.
The invention also provides a spot welding control method of the single-sided spot welding device, which is used for the single-sided spot welding panel edge covering, the panel edge covering comprises an inner plate and an outer plate which are attached up and down, one side of the outer plate is bent towards the inner plate to form an outer plate flanging on the inner plate, and the spot welding control method is characterized by comprising the following steps:
acquiring a first thickness value of the outer plate and a second thickness value of the inner plate;
determining a welding current parameter according to the first thickness value and the second thickness value;
controlling the clamping mechanism to clamp and fix the plate edge;
driving the spot welding mechanism to move to a pre-welding station so as to enable the negative electrode to be attached to the inner plate;
controlling the driving part to drive the positive electrode to move up and down so as to precompact the flanging of the outer plate;
controlling a welding gun according to the welding current parameters to weld the plate in an edge-covering manner;
after the welding is completed, the driving part is controlled to drive the positive electrode to be far away from the welding position.
Optionally, after the obtaining the first thickness value of the outer plate and the second thickness value of the inner plate, the method further includes:
determining a target radius of curvature value of the spherical surface of the electrode cap according to the first thickness value and the second thickness value;
identifying a target electrode cap having the target radius of curvature value among a plurality of the electrode caps;
a control mounting structure mounts the target electrode cap to the positive electrode.
Optionally, the determining a welding current parameter according to the first thickness value and the second thickness value includes:
and inquiring a first mapping relation when the first thickness value meets a first preset condition and the second thickness value meets a second preset condition so as to determine welding current parameters.
Optionally, the thickness value of the outer plate is a, the thickness value of the inner plate is b, and the welding current parameter is c, wherein:
the first preset condition comprises 0.6mm < a < 0.8mm;
the second preset condition comprises that b is more than 0.6mm and less than 1.0mm;
4kA＜c＜6kA。
optionally, the welding current parameters further include a welding time and a dwell time;
the welding gun is controlled according to the welding current parameter to weld the plate in a wrapping way, and the welding method comprises the following steps:
controlling the transformer to output welding current until the welding time is reached;
and after the welding time, continuously controlling the electrode cap to be pressed on the panel edge until the pressure maintaining time is reached.
Optionally, the controlling the driving part drives the positive electrode to move up and down to precompact the flanging of the outer plate includes:
determining a target electrode pressure value for the positive electrode from the first thickness value and the second thickness value;
and controlling the driving part to drive the positive electrode to move up and down so as to press the outer plate flanging until the end pressure value of the positive electrode reaches the target electrode pressure value.
According to the technical scheme provided by the invention, the workpiece to be welded is clamped through the clamping mechanism, the spot welding mechanism is driven to move to the welding station, so that the negative electrode is attached to the inner plate of the workpiece to be welded, the driving part is driven to drive the positive electrode to move up and down so as to pre-press the outer plate of the workpiece to be welded, after the positive electrode passes through the transformer, the single-sided spot welding is carried out on the workpiece to be welded through the electrode cap arranged at the end part of the positive electrode, and the spherical electrode cap can reduce the electrified cross section area and increase the current density, so that the spherical electrode cap can generate a proper nugget size under a small current, and can fully contact with the spherical electrode cap and the plane or the curved surface at various angles of the plate, so that the appearance problem caused by mismatching of the electrode and the surface of the workpiece can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of an embodiment of a single-sided spot welding apparatus according to the present invention;
FIG. 2 is a schematic perspective view of the clamping mechanism of FIG. 1;
FIG. 3 is a schematic top view of the clamping mechanism of FIG. 2;
FIG. 4 is a perspective view of the electrode cap of FIG. 1;
FIG. 5 is a flow chart of a first embodiment of a spot welding control method of a single-sided spot welding apparatus of the present invention;
FIG. 6 is a flow chart of a second embodiment of a spot welding control method of a single-sided spot welding apparatus of the present invention;
FIG. 7 is a flow chart of a third embodiment of a spot welding control method of a single-sided spot welding apparatus of the present invention;
FIG. 8 is a flow chart of a fourth embodiment of a spot welding control method of a single-sided spot welding apparatus of the present invention;
fig. 9 is a flowchart showing a spot welding control method according to a fifth embodiment of the single-sided spot welding apparatus of the present invention.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The four-door two covers of the automobile not only require higher surface quality, but also must ensure that the four-door two covers always maintain good dimensional stability in the production, transportation, assembly and adjustment and whole automobile use processes. Based on the requirements, a reasonable process method is needed to be adopted after the edge wrapping of the inner and outer plates is completed so as to prevent the dimensional change caused by the movement of the inner and outer plates.
Compared with the other two process methods, the single-sided spot welding has the advantages of low cost, small occupied space and capability of being changed at the existing station. The anti-shifting process after the automobile door cover is covered does not require higher connection strength, but is only used as a supplementary process for covering the edge, so that the single-sided spot welding has wider application prospect when being used as a simple process supplementary means for the automobile door cover production process.
The existing single-sided spot welding technology is that an automatic welding single-sided spot welding gun driven by a cylinder or a robot single-sided spot welding gun is a conventional electrode cap with a front end face, under the condition, the current of welding spots with connection strength can be welded to be more than 6KA, the welding time is more than 5CYC, the thermal deformation of an outer plate of a door cover can be caused by the heat input quantity of the welding parameters, and the appearance of the door cover after electrophoresis is not in accordance with the quality requirement. Meanwhile, the electrode cap with the end face is generally not well matched with the shape of the part, so that the concave or convex pressing condition is caused, the appearance quality problem is caused, the difficulty is brought to the mass production of single-sided spot welding, and the popularization of the single-sided spot welding is influenced.
In view of the foregoing, the present invention provides a single-sided spot welding apparatus, and fig. 1 to 4 are specific embodiments of the single-sided spot welding apparatus provided by the present invention.
Referring to fig. 1 to 3, the single-sided spot welding apparatus 100 includes a base 1, a spot welding mechanism 2 and a clamping mechanism 3, the spot welding mechanism 2 is disposed on the base 1, the spot welding mechanism 2 includes a positive electrode 21, a negative electrode 22, a transformer 23 and a driving portion 24, the positive electrode 21 and the negative electrode 22 are respectively electrically connected with the transformer 23, the positive electrode 21 is movably mounted on the base 1 along an up-down direction, the driving portion 24 is in driving connection with the positive electrode 21 to drive the positive electrode 21 to move along the up-down direction, an electrode cap 5 is mounted at a free end of the positive electrode 21, an end portion of the electrode cap 5 is provided as a spherical surface, and the clamping mechanism 3 is used for clamping and fixing a workpiece to be welded.
According to the technical scheme provided by the invention, the workpiece to be welded is clamped through the clamping mechanism, the spot welding mechanism 2 is driven to move to a welding station, so that the negative electrode 22 is attached to an inner plate of the workpiece to be welded, the driving part 24 is driven to drive the positive electrode 21 to move up and down so as to pre-press an outer plate of the workpiece to be welded, the transformer 23 is used for carrying out single-sided spot welding on the workpiece to be welded after the positive electrode 21 passes through, and the electrode cap 5 arranged at the end part of the positive electrode 21 is a spherical surface, so that the spherical electrode cap 5 can reduce the electrified cross section area, increase the current density, enable the spherical electrode cap 5 to generate proper nugget size at a small current, and enable the spherical electrode cap 5 to be fully contacted with various angles of a plate, so that the appearance problem caused by mismatching of the electrode and the surface of the workpiece can be reduced.
Specifically, the clamping mechanism 3 includes a mounting seat 31, a cushion block 32, a pressing portion 33 and an air cylinder 34, the cushion block 32 is detachably mounted on the mounting seat 31, the pressing portion 33 is disposed above the cushion block 32 and is movably disposed along an up-down direction, so as to clamp a workpiece to be welded with the cushion block 32 up and down, and the air cylinder 34 is in driving connection with the pressing portion 33, so as to drive the pressing portion 33 to move up and down. Through the vertical clamping arrangement of the pressing part 33 and the cushion block 32, not only the effect of clamping limit can be achieved, but also the pre-pressure can be applied to the workpiece to be welded, a stable welding environment is provided for the subsequent welding process, and the pre-pressure can be adjusted by adopting the air cylinder 34 as a driving part.
In order to adapt the cushion block 32 to clamp the workpiece to be welded, in this embodiment, the pressing part 33 includes a pressing arm 331 extending along a horizontal direction and a pressing block 332 protruding from a lower end of the pressing arm 331, the pressing block 332 is disposed corresponding to the cushion block 32, the air cylinder 34 is in driving connection with the pressing arm 331, so as to drive the pressing arm 331 to move along an up-down direction, and the pressing block 332 and the cushion block 32 are disposed up-down, so that the workpiece to be welded can adapt to a shape without using the workpiece to be welded, in addition, the pressing force applied by the pressing arm 331 can be adjusted by driving the pressing arm 331 through the air cylinder 34.
Generally, when the single-sided spot welding is performed on the hemming and flanging of the door cover, the welding pressure applied to the outer edge of the hemming and flanging is large, so in this embodiment, the upper surface of the cushion block 32 is inclined from one side to the other side, the inclined surface is an arc surface and is used for attaching and supporting the outer surface of the workpiece to be welded, and for better supporting the outer edge, a part of the inclined surface is required to exceed the surface of the workpiece to ensure a sufficient supporting area, after the workpiece to be welded is clamped by the clamping mechanism 3, the cushion block 32 is at least partially higher than the workpiece to be welded, in this embodiment, a part of a fifth to a fourth of the cushion block 32 exceeds the surface of the workpiece, so that the stable clamping function can be provided and the support is provided for the outer edge.
Based on the above-mentioned device, the present invention further provides a method for controlling spot welding of the single-sided spot welding device 100, which is used for single-sided spot welding of the panel edge 4, the panel edge 4 includes an inner panel and an outer panel that are attached up and down, one side of the outer panel is bent towards the inner panel to form an outer panel flanging on the inner panel, please refer to fig. 5, which is a schematic flow chart of a first embodiment of the spot welding control method of the single-sided spot welding device 100, the method for controlling spot welding includes:
s10: acquiring a first thickness value of the outer plate and a second thickness value of the inner plate;
s20: determining a welding current parameter according to the first thickness value and the second thickness value;
s30: controlling the clamping mechanism 3 to clamp and fix the plate edge 4;
s40: driving the spot welding mechanism 2 to move to a pre-welding station so as to enable the negative electrode 22 to be attached to the inner plate;
s50: controlling the driving part 24 to drive the positive electrode 21 to move up and down so as to pre-press the flanging of the outer plate;
s60: controlling a welding gun according to the welding current parameters to weld the plate edge covering 4;
s70, performing S70; after the welding is completed, the driving portion 24 is controlled to drive the positive electrode 21 away from the welding position.
In this embodiment, first, a first thickness value of the outer plate and a second thickness value of the inner plate are obtained, and a welding current parameter is determined according to the first thickness value and the second thickness value, and it is to be noted that the welding current parameter is in a proportional relationship with a sum of the first thickness value and the second thickness value, that is, when the sum of the two thickness values is larger, the welding current parameter is also larger, for example, when the first thickness value is 0.6mm, the second thickness value is 0.6, and the sum of the two thickness values is 1.2mm, at this time, the determined welding current is 4kA, and when the first thickness value is 0.8mm, when the second thickness value is 1.0mm, the sum of the two is 1.8mm, the determined welding current is 6kA, the clamping mechanism 3 is controlled to clamp and fix the panel edge 4, the spot welding mechanism 2 is driven to move to a pre-welding station so as to enable the negative electrode 22 to be attached to the inner plate to ensure conductivity, the driving part 24 is controlled to drive the positive electrode 21 to move up and down to pre-press the flanging of the outer plate, the welding gun is controlled to weld the panel edge 4 according to the welding current parameter after pre-pressing a certain pre-pressing force, the welding is completed, and after the welding is completed, the driving part 24 is controlled to drive the positive electrode 21 to be far away from the welding position.
Referring to fig. 6, which is a schematic flow chart of a second embodiment of the spot welding control method of the single-sided spot welding apparatus 100 according to the present invention, after obtaining the first thickness value of the outer plate and the second thickness value of the inner plate, the method further includes:
s, 11: determining a target curvature radius value of the spherical surface of the electrode cap 5 according to the first thickness value and the second thickness value;
s12: identifying a target electrode cap 5 having the target radius of curvature value among the plurality of electrode caps 5;
s13: the control mounting structure mounts the target electrode cap 5 on the positive electrode 21.
It should be noted that the mounting structure is not particularly limited, and may be assembled by a robot or automatically replaced by an adapter.
In this embodiment, the target radius of curvature value of the spherical surface of the electrode cap 5 is determined according to the first thickness value and the second thickness value, among the plurality of electrode caps 5, the target electrode cap 5 having the target radius of curvature value is identified, it is to be noted that when the sum of the two thickness values is large, there is a risk of incomplete welding with the electrode cap 5 having the smaller radius of curvature, and therefore, the sum of the two thickness values is in direct proportion to the target radius of curvature value, for example, when the sum of the thicknesses of the outer plate and the inner plate is in the range of 1.2mm to 1.8mm, the electrode cap 5 having the radius of curvature value of 13mm is adopted, then, among the plurality of electrode caps 5, the target electrode cap 5 having the target radius of curvature value is identified, and the mounting structure is controlled to mount the target electrode cap 5 on the positive electrode 21.
Further, referring to fig. 7, a flowchart of a third embodiment of a spot welding control method of the single-sided spot welding apparatus 100 according to the present invention is shown, based on the first embodiment, the determining welding current parameters according to the first thickness value and the second thickness value includes:
s21: and inquiring a first mapping relation when the first thickness value meets a first preset condition and the second thickness value meets a second preset condition so as to determine welding current parameters.
In this embodiment, since the spot welding control method is used for single-sided spot welding of the panel edge 4, there is a certain application range for welding the inner panel and the outer panel, it is required to ensure that the first thickness value satisfies a first preset condition and the second thickness value satisfies a second preset condition, so that there is a good welding effect, and the determined welding current parameter should not be too large, and should be kept within a certain range, for example, in this embodiment, the thickness value of the outer panel is a, the thickness value of the inner panel is b, and the welding current parameter is c, where: the first preset condition comprises 0.6mm < a < 0.8mm; the second preset condition comprises that b is more than 0.6mm and less than 1.0mm; when the preset condition is met, inquiring a first mapping relation to determine welding current parameters, wherein the first mapping relation is a direct proportion relation, namely c=k 1 (a+b), in the present embodiment, k 1 ＝10/3。
Referring to fig. 8, a flow chart of a fourth embodiment of a spot welding control method of the single-sided spot welding apparatus 100 according to the present invention is shown, and based on the first embodiment, the welding current parameters further include a welding time and a dwell time;
the controlling the welding gun according to the welding current parameter to weld the panel edge covering 4 comprises the following steps:
s61: controlling the transformer 23 to output welding current until the welding time is reached;
s62: after the welding time, the electrode cap 5 is continuously controlled to be pressed on the panel edge 4 until the dwell time is reached.
In this embodiment, the welding current parameters further include a welding time and a dwell time, during the welding process, the transformer 23 is controlled to output a welding current until the welding time is reached, during the welding, the current flows through the weldment through the electrode, so that intense resistance heat is generated at the welding position, the metal at the most concentrated position of heat is melted first, meanwhile, the melted metal is surrounded by a metal ring which has not been melted and has a plastic character, so that the melted metal cannot overflow, after the welding time is passed, in order to avoid that the liquid metal in the welding core is not extremely crystallized, the electrode is lifted, so that the welding core metal cannot be complemented due to solidification in the closed plastic ring, and shrinkage or loose structure is formed, and therefore, the electrode cap 5 needs to be controlled to be continuously pressed on the plate wrapping 4 until the dwell time is reached. The welding time is also proportional to the sum of the first thickness value and the second thickness value, and the welding time t=k 2 (a+b), in the present embodiment, the welding time t ranges from 4 (cyc) to 6 (cyc), k 2 ＝10/3。
Referring to fig. 9, which is a schematic flow chart of a fifth embodiment of a spot welding control method of the single-sided spot welding apparatus 100 according to the present invention, based on the first embodiment, the controlling the driving portion 24 to drive the positive electrode 21 to move up and down to pre-press the flange of the outer panel includes:
s51: determining a target electrode pressure value of the positive electrode 21 from the first thickness value and the second thickness value;
s52: the driving part 24 is controlled to drive the positive electrode 21 to move up and down to press the outer panel flange until the end pressure value of the positive electrode 21 reaches the target electrode pressure value.
In this embodiment, the target electrode pressure value of the positive electrode 21 is determined according to the first thickness value and the second thickness value, the driving portion 24 is controlled to drive the positive electrode 21 to move up and down to press the flange of the outer plate until the end pressure value of the positive electrode 21 reaches the target electrode pressure value, it is to be noted that the pre-pressing is to ensure that the workpieces to be welded are in close contact, for example, the pre-pressing time is too short, the two workpieces are not in close contact, the current starts to be supplied, the burn-through phenomenon may occur during spot welding due to too large contact resistance, the target electrode pressure value of the positive electrode 21 is in proportional relation to the sum of the first thickness value and the second thickness value, and the target electrode pressure value f=k of the positive electrode 21 3 (a+b), in the present embodiment, the F is in the range of 0.8KN-1.2KN, the k 3 ＝2/3。
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. A single-sided spot welding apparatus, comprising:
a base;
the spot welding mechanism is arranged on the base and comprises a positive electrode, a negative electrode, a transformer and a driving part, wherein the positive electrode and the negative electrode are respectively and electrically connected with the transformer, the positive electrode is movably arranged on the base along the up-down direction, the driving part is in driving connection with the positive electrode and is used for driving the positive electrode to move along the up-down direction, an electrode cap is arranged at the free end of the positive electrode, and the end part of the electrode cap is a spherical surface; the method comprises the steps of,
the clamping mechanism is used for clamping and fixing the workpiece to be welded.
2. The single-sided spot welding apparatus of claim 1, wherein the clamping mechanism comprises:
a mounting base;
the cushion block is detachably arranged on the mounting seat;
the pressing part is arranged above the cushion block and is movably arranged along the up-down direction and used for clamping a workpiece to be welded with the cushion block up and down; the method comprises the steps of,
and the air cylinder is in driving connection with the pressing part and is used for driving the pressing part to move up and down.
3. The single-sided spot welding device as set forth in claim 2, wherein the pressing portion includes a pressing arm extending in a horizontal direction and a pressing block protruding from a lower portion of the pressing arm, the pressing block being disposed in correspondence to the pad, and the cylinder being drivingly connected to the pressing arm for driving the pressing arm to move in an up-down direction.
4. The single-sided spot welding device as set forth in claim 2, wherein the upper surface of the pad is inclined from one side to the other side, and the inclined surface is a cambered surface for fitting and supporting the outer surface of the workpiece to be welded; and/or the number of the groups of groups,
after the clamping mechanism clamps the workpiece to be welded, the cushion block is at least partially higher than the workpiece to be welded.
5. A spot welding control method of a single-sided spot welding device, based on the single-sided spot welding device according to any one of claims 1 to 4, for a single-sided spot welding panel hemming including an inner panel and an outer panel attached up and down, one side of the outer panel being bent toward the inner panel to form an outer panel hemming on the inner panel, characterized by comprising:
acquiring a first thickness value of the outer plate and a second thickness value of the inner plate;
determining a welding current parameter according to the first thickness value and the second thickness value;
controlling the clamping mechanism to clamp and fix the plate edge;
driving the spot welding mechanism to move to a pre-welding station so as to enable the negative electrode to be attached to the inner plate;
controlling the driving part to drive the positive electrode to move up and down so as to precompact the flanging of the outer plate;
controlling a welding gun according to the welding current parameters to weld the plate in an edge-covering manner;
after the welding is completed, the driving part is controlled to drive the positive electrode to be far away from the welding position.
6. The spot welding control method of the single-sided spot welding apparatus according to claim 5, further comprising, after the obtaining the first thickness value of the outer panel and the second thickness value of the inner panel:
determining a target radius of curvature value of the spherical surface of the electrode cap according to the first thickness value and the second thickness value;
identifying a target electrode cap having the target radius of curvature value among a plurality of the electrode caps;
a control mounting structure mounts the target electrode cap to the positive electrode.
7. The spot welding control method of a single-sided spot welding apparatus as set forth in claim 5, wherein said determining a welding current parameter from said first thickness value and said second thickness value includes:
and inquiring a first mapping relation when the first thickness value meets a first preset condition and the second thickness value meets a second preset condition so as to determine welding current parameters.
8. The spot welding control method of the single-sided spot welding apparatus according to claim 7, wherein the thickness value of the outer panel is a, the thickness value of the inner panel is b, and the welding current parameter is c, wherein:
the first preset condition comprises 0.6mm < a < 0.8mm;
the second preset condition comprises that b is more than 0.6mm and less than 1.0mm;
4kA＜c＜6kA。
9. the spot welding control method of the single-sided spot welding apparatus as set forth in claim 5, wherein the welding current parameters further include a welding time and a dwell time;
the welding gun is controlled according to the welding current parameter to weld the plate in a wrapping way, and the welding method comprises the following steps:
controlling the transformer to output welding current until the welding time is reached;
and after the welding time, continuously controlling the electrode cap to be pressed on the panel edge until the pressure maintaining time is reached.
10. The spot welding control method of the single-sided spot welding apparatus according to claim 5, wherein the controlling the driving portion to drive the positive electrode to move up and down to preload the outer panel flange includes:
determining a target electrode pressure value for the positive electrode from the first thickness value and the second thickness value;
and controlling the driving part to drive the positive electrode to move up and down so as to press the outer plate flanging until the end pressure value of the positive electrode reaches the target electrode pressure value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310911930.1A CN116967582A (en) | 2023-07-24 | 2023-07-24 | Single-sided spot welding device and spot welding control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310911930.1A CN116967582A (en) | 2023-07-24 | 2023-07-24 | Single-sided spot welding device and spot welding control method thereof |
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| CN116967582A true CN116967582A (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310911930.1A Pending CN116967582A (en) | 2023-07-24 | 2023-07-24 | Single-sided spot welding device and spot welding control method thereof |
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| Country | Link |
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| CN (1) | CN116967582A (en) |
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