KR102120913B1 - 3-axis control projection nut welding device - Google Patents

Abstract

The present invention relates to a 3-axis control projection nut welding device comprising: a base panel member; a material support member which is formed upwards from the center of the base panel member and of which an upper portion, at which a part to be welded is positioned, is moved horizontally; a cylindrical welding member in which a welding part vertically moving above the material support member is formed; an upper panel member formed to support the cylindrical welding member; and a control unit for controlling the cylindrical welding member. When the nut member is positioned over the part to be welded after the upper portion of the material support member horizontally moves the part to be welded under the welding part by a command of the control unit, a lower portion of the welding part is vertically moved to press an upper portion of a nut member and let current pass through, such that a lower portion of the nut member is welded to the part to be welded.

Description

3-axis control projection nut welding device

The present invention relates to a three-axis control projection nut welding device, the three-axis control while the servo motor and the ball screw is directly connected to a three-axis control projection nut welding device secured a reliable level of precision.

The projection nut refers to a nut that is already welded and fixed to a fixed product in order to fix a part by fastening only with a bolt when a part is to be fastened and fixed in a predetermined position, in particular, a plurality of panels The process of fixing the base frame to the basic frame or fastening and fixing the exterior panel to the outside of the already assembled panel is mainly seen in automobiles.

Conventional projection nut welding apparatus has a problem that it is impossible to control a variable stroke using a pneumatic cylinder pressurization method.

Korean Registered Patent No. 10-0479510

An object of the present invention is to provide a three-axis control projection nut welding apparatus capable of controlling a variable stroke.

The present invention is a cylinder formed with a base panel member, a material support member that is formed upward from the center of the base panel member and the portion to be welded is horizontally moved, and a welding part that is vertically moved above the material support member. It includes a type welding member, a top panel member formed to support the cylindrical welding member, and a control unit for controlling the cylindrical welding member, and an upper portion of the material supporting member is welded to a portion to be welded by an instruction of the control unit. After horizontally moving to the lower portion of the, when the nut member is positioned on the upper portion of the welded portion, the lower portion of the welding portion is vertically moved to pass current while pressing the upper portion of the nut member and the lower portion of the nut member is welded to the portion to be welded It provides a three-axis control projection nut welding device, characterized in that.

The material supporting member is formed with a horizontal moving member on the upper portion where the member to be welded is located, and the horizontal moving member is formed with a first horizontal moving member moving in the X-axis direction and a lower portion of the first horizontal moving member. It includes a second horizontal movement member that is moved in the Y-axis direction, between the first horizontal movement member and the second horizontal movement member is formed an X-axis moving portion for moving the first horizontal movement member in the X-axis direction, the second Between the two horizontal movement members and the material support member, a Y-axis movement unit for moving the second horizontal movement member in the Y-axis direction may be formed.

The X-axis moving part is an X-axis driving part formed of a motor, an X-axis ball screw rotated by the X-axis driving part, and an X-axis moving member engaged with the X-axis ball screw to move the material support member in the X-axis direction. Including, the Y-axis moving portion is formed by a motor Y-axis drive unit, the Y-axis ball screw rotated by the Y-axis drive unit, and the Y-axis ball screw is engaged with the material support member to move in the Y-axis direction It may include a Y-axis moving member.

The cylindrical welding member includes a Z-axis moving part for moving the cylindrical welding member in the Z-axis direction, and a welding part formed under the Z-axis moving part, and the Z-axis moving part is formed by a servo motor. It may include a Z-axis driving part, a Z-axis ball screw formed to be rotated by the Z-axis driving part, and a Z-axis moving member engaged with the Z-axis ball screw to move the welding part in the Z-axis direction.

A brake unit is formed for precise control of the servo motor that is the Z-axis driving unit, and the brake unit is formed of a pad that holds a brake plate formed on a rotation axis of the servo motor, and holds the brake plate with a pad at predetermined intervals in the control unit. Can be.

A central through hole through which an upper portion of the cylindrical welding member penetrates is formed in the upper panel member, and four guide rod members for guiding the cylindrical welding member at four adjacent points around the central through hole are formed, In the upper panel member, four adjacent through holes in which the four guide bar members are moved in a vertical line direction are formed, and an upper end of the four guide bar members is located above the cylindrical welding member positioned above the upper panel member. An upper plate to be coupled is formed, and a lower plate to which the lower ends of the four guide rod members are coupled may be formed below the cylindrical welding member positioned below the upper panel member.

The control method of the control unit may be an indirect feedback system control method that indirectly estimates and corrects the position of the welding portion by measuring the rotation angle of the Z-axis driving portion.

A display unit with a digital LCD control module for visualizing internal parameters may be formed on the Z-axis driving unit.

A side support member formed to support a side surface of the member to be welded may be formed on the material support member on the horizontal moving member.

The control method of the control unit may be an indirect feedback system control method of attaching a sensor portion to the upper panel member and measuring a change in a dimension line formed in the guide rod member to indirectly estimate and correct the position of the welding portion.

The present invention can provide a three-axis control projection nut welding apparatus capable of controlling a variable stroke using a servo motor.

The present invention has a high reliability through the semi-closed loop control method, and the effect of shortening the working time occurs.

The present invention has the effect of making the error of the running precision of the servo motor and the repeatability of the system less than ㅁ50㎛.

1 is a schematic perspective view showing a three-axis control projection nut welding apparatus according to the present invention.
2 is a schematic perspective view showing the material support member of FIG. 1.
Fig. 3(a) is a schematic plan perspective view showing the horizontal moving member of Fig. 2, and Fig. 3(b) is a schematic front perspective view showing the horizontal moving member of Fig. 2.
4 is a schematic cross-sectional view showing the cylindrical welding member of FIG. 1.
5 is a schematic front view showing that the sensor unit is mounted on the upper panel member.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the accompanying drawings are only for explaining the contents of the present invention more easily, and the scope of the present invention is not limited to the scope of the attached drawings, and it is easily carried out by those skilled in the art. You will know.

In the description of the present embodiment, the same name and the same code are used for the same configuration, and additional description will be omitted.

Also, the terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “include” or “have” are intended to indicate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

1 is a schematic perspective view showing the present invention, a three-axis control projection nut welding device, Figure 2 is a schematic perspective view showing the material support member of Figure 1, Figure 3 (a) is a schematic plane showing the horizontal moving member of Figure 2 3B is a schematic front perspective view showing the horizontal moving member of FIG. 2.

The present inventor 3-axis control projection nut welding apparatus 100 includes a base panel member 110, a material support member 130 formed upward from the center of the base panel member 110, and the material support member 130 Cylindrical welding member 150 is formed spaced above the, the upper panel member 170 is formed to support the cylindrical welding member 150, and the upper panel member 170 is the base panel member 110 ), a panel support member 190 supporting the upper panel member 170 and a control unit 210 controlling the cylindrical welding member 150 so as to maintain a predetermined distance from above.

The material support member 130 is a side support member 132 and a side support member 132 that is formed to support the side surface of the member 500 to be welded to the upper portion to be welded member 500 is located ) Includes a horizontal moving member 134 formed on the lower portion.

The horizontal moving member 134 is a first horizontal moving member 138 moved in the X-axis direction, and a second horizontal moving member formed below the first horizontal moving member 138 and moved in the Y-axis direction. (142).

Between the first horizontal moving member 138 and the second horizontal moving member 142 is formed an X-axis moving portion 139 for moving the first horizontal moving member 138 in the X-axis direction, the second horizontal Between the moving member 142 and the material support member 130, a Y-axis moving portion 143 for moving the second horizontal moving member 142 in the Y-axis direction is formed.

The X-axis moving part 139 includes an X-axis driving part 139-1 formed by a motor, an X-axis ball screw 139-2 rotated by the X-axis driving part 139-1, and the X-axis. It is engaged with the ball screw (139-2) and includes an X-axis moving member (139-3) for moving the material support member 130 in the X-axis direction.

The Y-axis moving unit 143 is a Y-axis driving unit 143-1 formed of a motor, a Y-axis ball screw 143-2 rotated by the Y-axis driving unit 143-1, and the Y-axis It includes a Y-axis moving member (143-3) that is engaged with the ball screw (143-2) to move the material support member (130) in the Y-axis direction.

4 is a schematic cross-sectional view showing the cylindrical welding member of FIG. 1.

The cylindrical welding member 150 includes a Z-axis moving part 152 for moving the cylindrical welding member 150 in the Z-axis direction, and a welding part 160 formed under the Z-axis moving part 152. Includes. The Z-axis moving part 152 is a Z-axis driving part 152-1 formed of a servo motor and a Z-axis ball screw 152- formed to be rotated by the Z-axis driving part 152-1. 2) and a Z-axis moving member 152-3 engaged with the Z-axis ball screw 152-2 to move the welding part 160 in the Z-axis direction.

The servo motor (Servo Motor) includes a motor and a control unit 210. The servo motor is not a servo motor, and the control unit 210 includes an appropriate control circuit and algorithm.

The control unit 210 oversees the overall control of the motor control and the three-axis control projection nut welding device.

The term "servo" of the servo motor means that the motor that follows the command as follows or follows is called a servo motor, and the exact position and position according to the command, such as a motor used in machine tools, CCTV cameras, camcorders, DVDs, printers, etc. A motor that can adjust the speed is called a servo motor.

The X-axis driving unit 139-1, the Y-axis driving unit 143-1, and the Z-axis driving unit 152-1 are respectively connected to the control unit 210 and driven according to a command transmitted from the control unit 210.

Therefore, the X-axis driving unit 139-1 is operated by the command of the control unit 210 to move the member 500 to be welded in the X-axis direction, and the Y-axis driving unit 143-1 is operated to operate the member to be welded. By moving the 500 in the Y-axis direction, the portion to be welded, which is the portion to be welded of the member to be welded 500, is positioned below the welding portion 160.

And the nut member 502 is located on the portion to be welded of the member 500 to be welded, and the control unit 210 operates the Z-axis driving unit 152-1 to move the Z-axis moving member 152-3 downward. When the lower portion of the welding part 160 moves to pass the current while pressing the upper portion of the nut member 502, the lower portion of the nut member 502 is welded to the welded portion.

At this time, in the present invention, the brake unit 220 is formed for precise control of the Z-axis driving unit 152-1 servo motor.

The brake unit 220 is formed of a pad 224 that holds the brake plate 222 formed on the rotation axis of the servo motor, and the brake plate 222 is applied to the pad 224 at intervals preset by the control unit 210. Hold it to perform the correct braking of the servo motor.

The brake unit 220 is formed to stop after the servo motor is operated only to the correct position, and is to withstand the load for vertical mounting.

Through this, the effect of making the error of the running precision of the servo motor and the repeatability of the system less than 50 µm occurs.

In addition, it is possible to control a variable stroke compared to the conventional pneumatic cylinder pressurization method, which can significantly reduce the approach time to the work object and shorten the maintenance time during the welding process.

The Z-axis driving unit 152-1 is formed with a display unit 240 in which a digital LCD control module for visualizing internal parameters is embedded.

Meanwhile, a central through hole 172 through which an upper portion of the cylindrical welding member 150 penetrates is formed in the upper panel member 170, and the cylinder is disposed at four adjacent points around the central through hole 172. Four guide rod members 174 for guiding the molded welding member 150 are formed, and four adjacent through holes in which the four guide rod members 174 are moved in the vertical direction in the upper panel member 170 ( 176) is formed.

An upper plate 178 to which the upper ends of the four guide rod members 174 are coupled is formed on an upper portion of the cylindrical welding member 150 positioned above the upper panel member 170, and the upper panel member 170 ) The lower plate 180 to which the lower ends of the four guide rod members 174 are coupled is formed below the cylindrical welding member 150 positioned below.

The numerical control system of the present invention uses a semi-closed loop control method to encode the rotational angle of the Z-axis driving unit 152-1 formed by a Z-axis ball screw 152-2 or a servo motor. (Not shown) is an indirect feedback system control method that indirectly estimates and corrects the position of the weld 160.

Among other control methods, the Open Loop control method is a control method that sends commands only and does not check whether the welding part 160 moves properly. The reliability is low, and the closed loop control method actually determines whether the welding part 160 moves or moves properly. (160) There is a disadvantage that it takes a long time to work by measuring and checking the position.

Therefore, the present invention has a high reliability through the semi-closed loop control method, and the effect of shortening the working time occurs.

5 is a schematic front view showing that the sensor unit is mounted on the upper panel member.

The present invention attaches the sensor unit 310 to the upper panel member 170 and measures the change of the dimension line 320 formed in the guide rod member 174 to indirectly estimate and correct the position of the welding unit 160 and correct it. System control method can also be used.

The position where the maximum deformation occurs when the rated load (250 kgf) is applied to the 3-axis control projection nut welding apparatus 100 according to the present invention is the upper panel member 170, the maximum deformation amount is 0.0058 [mm], and the maximum stress is 8.5 [MPa] ], and the maximum stress is 4.2% of the yield stress 250 [MPa] of the structural force, which is the material of the welding machine, and it can be judged to be stable when the welding machine is operating. The structure is stable with a minimum safety factor of 15.

The position where the maximum deformation occurs when the ultimate load (1000 kgf) is applied to the three-axis control projection nut welding apparatus 100 in the extreme operating conditions is the upper panel member 170 as the rated load, and the maximum deformation amount It is 0.0064 [mm], the maximum stress is 45.2 [MPa], and the maximum stress is 22.6% of the structural steel's yield stress, which can be judged to be safe when the welding machine is operating.

The minimum lifespan occurs at the maximum stress generating part of the 3-axis control nut projection welding machine, and it is considered that it is possible to apply it to mass production process with 6.0[cycle] when the rated load is applied and 5.0[cycle] when the extreme load is applied.

As described above, the embodiments according to the present invention have been looked at, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the embodiments described above are those with ordinary knowledge in the art. It is obvious. Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description and may be changed within the scope of the appended claims and their equivalents.

100: 3-axis control projection nut welding device 110: base panel member
130: material support member 132: side support member
134: horizontal moving member 138: first horizontal moving member
139: X-axis moving unit 139-1: X-axis driving unit
139-2: X-axis ball screw 139-3: X-axis moving member
142: second horizontal moving member 143: Y-axis moving portion
143-1: Y-axis drive 143-2: Y-axis ball screw
143-3: Y-axis moving member 150: cylindrical welding member
152: Z-axis moving part 152-1: Z-axis driving part
152-2: Z-axis ball screw 152-3: Z-axis moving member
160: welding part 170: upper panel member
190: panel support member 210: control unit

Claims (7)

delete A base panel member,
A material support member formed upward from the center of the base panel member and horizontally moved to an upper portion where the portion to be welded is located,
A cylindrical welding member in which a welding part vertically moved above the material supporting member is formed,
An upper panel member formed to support the cylindrical welding member, and
It includes a control unit for controlling the cylindrical welding member,
After the upper portion of the material supporting member horizontally moves the portion to be welded to the lower portion of the welding portion by the command of the control unit, when the nut member is positioned on the upper portion of the welding portion, the lower portion of the welding portion is vertically moved to the upper portion of the nut member. Passing the current while pressing and the lower part of the nut member is welded to the welded part,
The material support member
A horizontal moving member is formed on an upper portion where the member to be welded is located,
The horizontal moving member
A first horizontal moving member moved in the X-axis direction,
A second horizontal moving member is formed below the first horizontal moving member and is moved in the Y-axis direction.
Between the first horizontal moving member and the second horizontal moving member is formed an X-axis moving portion for moving the first horizontal moving member in the X-axis direction,
Between the second horizontal moving member and the material support member, a three-axis control projection nut welding device, characterized in that a Y-axis moving portion for moving the second horizontal moving member in the Y-axis direction is formed. The method according to claim 2,
The X-axis moving part
X-axis driving unit formed of a motor,
An X-axis ball screw rotated by the X-axis driving unit,
And an X-axis moving member engaged with the X-axis ball screw to move the material support member in the X-axis direction,
The Y-axis moving part
Y-axis driving unit formed of a motor,
A Y-axis ball screw rotated by the Y-axis driving unit,
A three-axis control projection nut welding device comprising a Y-axis moving member engaged with the Y-axis ball screw to move the material support member in the Y-axis direction. The method according to claim 3,
The cylindrical welding member
A Z-axis moving portion for moving the cylindrical welding member in the Z-axis direction,
It includes a welding portion formed under the Z-axis moving portion,
The Z-axis moving part
Z-axis driving unit formed of a servo motor (Servo Motor),
A Z-axis ball screw formed to be rotated by the Z-axis driving unit,
And a Z-axis moving member engaged with the Z-axis ball screw to move the weld in the Z-axis direction. The method according to claim 4,
A brake unit is formed for precise control of the Z-axis driving unit, the servo motor,
The brake unit
It is formed of a pad that holds the brake plate formed on the rotating shaft of the servo motor,
A three-axis control projection nut welding device, characterized in that the brake plate is held by a pad at predetermined intervals by the control unit. The method according to any one of claims 2 to 5,
The upper panel member
A central through hole through which the upper portion of the cylindrical welding member passes is formed,
Four guide rod members are formed to guide the cylindrical welding member at four adjacent points around the central through hole,
Four adjacent through-holes in which the four guide rod members are moved in the vertical direction are formed in the upper panel member,
An upper plate to which the upper ends of the four guide rod members are coupled is formed at an upper portion of the cylindrical welding member positioned above the upper panel member, and the four at a lower portion of the cylindrical welding member positioned below the upper panel member. Three-axis control projection nut welding device, characterized in that the lower plate to which the lower end of the guide rod member is formed. The method according to claim 6,
The control method of the control unit is a three-axis control projection nut welding device, characterized in that the indirect feedback system control method that indirectly estimates and corrects the position of the weld by measuring the rotation angle of the Z-axis driving unit.

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