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
  • B23K9/00—Arc welding or cutting
  • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
  • B23K9/124—Circuits or methods for feeding welding wire
  • B23K9/125—Feeding of electrodes
• • 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
  • B23K9/00—Arc welding or cutting
  • B23K9/095—Monitoring or automatic control of welding parameters
  • B23K9/0956—Monitoring or automatic control of welding parameters using sensing means, e.g. optical
• • 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
  • B23K9/00—Arc welding or cutting
  • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
• • 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
  • B23K9/00—Arc welding or cutting
  • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
  • B23K9/1006—Power supply
  • B23K9/1012—Power supply characterised by parts of the process
  • B23K9/1037—Means preventing crater forming at the extremity of the seam

Definitions

• the present invention relates to a welding method in an automatic welding machine, and more particularly to a welding method suitable for use in selecting welding conditions for an automatic welding machine whose movement is controlled by a mouth and a mouth.
• FIG. 1 is a schematic view of a welding machine, in which a wire WR is fed out from a roller FR in a small amount in the direction of an arrow, and is passed through a guide member GB. H The wire protrudes from the tip of the TC and the wire tip is located at a position (for example, 15 mm) away from the surface of the welding member WK. The feed amount of the wire WR is controlled. ing .
• the lash side is applied to the wire WR via the guide member GB, and the high voltage negative side is applied to the welding member WK.
• the gas supply section (gas cylinder) shown in the drawing is supplied with gas so as to pass through the inside of the torch TC and impinge on the welding portion as shown by the arrow, thereby preventing oxidation of the welding portion.
• gas is supplied from the gas supply unit and a small amount of wire is supplied, and a high voltage is generated intermittently by the welding power source PS, the wire is supplied from the wire tip. Arc is generated and wire
• the optimum welding voltage, wire feed speed, pre-flow time, post-flow time, and the like are set according to the material of the wire and the welded part, the welding speed, etc. Crater processing time Which welding conditions are determined. For this reason, conventionally, the most suitable welding conditions have been set to a dial or the like during welding, and welding is performed based on the set welding conditions. However, if it is necessary to set the welding voltage, wire feed speed, pre-flow time, post-flow time, and crater processing time for each dial, etc. Therefore, the setting of the welding conditions is complicated, and the welding conditions can be easily changed. In addition, if welding conditions are different at the start and end of welding, the welding conditions must be set to dials in each case, and the setting of welding conditions becomes more and more complicated and necessary. However, this method is disadvantageous in terms of cost.
• an object of the present invention is to provide a welding method capable of selecting a desired welding condition without setting the welding condition in a dial.
• Another object of the present invention is to set welding voltage, wire feed speed, pre-flow time, post-flow time, and creator processing time as one set of welding conditions, and to use multiple sets of welding conditions.
• the welding conditions are stored in memory in advance, and the welding voltage, wire feed speed, pre-flow time, one hour of the bottle opening, Crater time can be selected in automatic welding machine
• O PI The purpose is to provide a welding method.
• Still another object of the present invention is to provide a welding method in an automatic welding machine which can set welding conditions without using a dial and is cost-effective.
• an arc is generated from a wire tip by applying a voltage between a wire and a welding member which can be moved along a welding path by a robot or a kit, and an arc is generated from a wire tip.
• This welding method is used in an automatic welding machine to weld the welded part by moving the wire tip along the welding passage by a robot with a force that sequentially pulls out the ears.
• the welding conditions are stored in the memory, the specified welding conditions are specified by the program, the specified welding conditions are read out from the memory, and the welding conditions are set according to the welding conditions. Welding is controlled by the machine. According to this invention, it is not necessary to set the welding conditions on the dial, so that the selection of the welding conditions becomes easy and the cost is advantageous.
• FIG. 1 is a schematic explanatory view of an automatic welding machine
• FIG. 2 is a block diagram of an embodiment of the present invention
• FIG. 3 is an explanatory view of an embodiment of an interface circuit in FIG. 2
• FIG. Fig. 5 is a flowchart of the process of the welding method according to the present invention.
• Fig. 5 is a diagram for explaining the robot and kit control data.
• Fig. 6 is a diagram showing the correspondence between the operands and the welding conditions. This is a time chart for various signals transmitted and received between the robot and the control unit and the automatic welding machine.
• RBCT is the robot controller and AWM is an automatic welding machine.
• Lot control unit g RBCT consists of a port processor 101 and a ROM that stores the control program.
• Read-only memory 102
• RAM random access memory
• G memory 104 non-volatile memory for storing a large number of welding conditions in advance 105, operation panel 106, and c.
• An interface circuit 108 that controls signal transmission and reception between 101 and the automatic welding machine AWM, and an axis server circuit 109X,
• 109 Y and 109 ⁇ . ⁇ , 110 and 111 are an address path and a data path.
• the robot command data is stored in RAM103 in advance.
• the power of the robot and the cut command data is as follows: (a) The torch TC is moved to the point PQ shown in FIG. 5 from the initial position (not shown) by rapid traverse. The torch is positioned at the welding start point P i from the torch PQ, and (c) the torch TC is linearly moved at a speed fi from the welding start point P i to the welding end point P 2 to perform welding. , if it is assumed to position thereafter Po Lee emissions door P 3, become cormorant good following.
• C 0 pre 3 2 sets of welding conditions in ra over data MEMO Li 1 0 5 is stored along with the O Pera run-de (index number).
• One set of welding conditions includes (1) welding voltage CMU (root), (wire feed speed WF (m / min) or welding current (, (3) pre-flow time PRD (sec), (4) Post flow time PSD
• the welding voltage CMU is the voltage output from the welding power source PS shown in Fig. 1
• the wire feed speed WF is the wire fed out by the feeding roller FR shown in Fig. 1. This is the feed rate of the WR. Since the wire feed speed and the welding current are proportional to each other, either may be specified.However, the wire feed speed is generally specified as one of the welding conditions because of the ease of control. Is done.
• the pre-flow time P R D is the time during which gas is blown from the gas supply unit to the welding part before the welding voltage is output, and the bottom flow time P S D is the end of welding cy.pi
• FIG. 6 is a diagram showing the relationship between the operand (index number) a stored in the RAM memory 105 and the welding conditions (CMU, WF, PRD, PSD, CFD).
• the S-code (S45) to perform welding and the S-coordinate (S46) for instructing the end of welding are each accompanied by the desired operand a.
• the end welding condition is selected.
• the processor 101 will move the axis (incremental value) X i, Y Calculate i and Z i. ⁇
• the robot is described as operating in the orthogonal coordinate system, but may be a cylindrical coordinate system or a joint coordinate system.
• the processor 101 calculates the following equation using the discrete values X i, Y i, and Z i of each ⁇ and the feed rate F.
• F ⁇ F ⁇ ⁇ X + Y + ⁇ is (2 c) C 0 ls e distributor 1 0 7 X i, JY i , if JZ i is input c. Performs a loss distribution operation.
• Input 1 0 9 Y> 1 0 9 ⁇ ⁇ rotate the motors MX, MY and MZ, and move a robot (not shown) along the command path.
• the torch (wire tip) gripped by the mouth pot moves along the welding path, and welding is performed.
• the processor 101 sets the current position Xa, Ya, Za of each axis stored in the working memory 104 every second by the following formula.
• step (d) As a result of the discriminating process of step (b), when the port command data does not include the path data, or when the process of step (c) is completed, the process The sensor 101 determines whether or not it contains the lot command data ⁇ S code 45 or S code 46 O o
• the transistor TR 1 When set, the transistor TR 1 conducts, the relay RL 1 of the automatic welding machine AWM operates, and the contacts of the relay close. As a result, the illustrated solenoid valve is opened, and the gas force is applied from the gas cylinder force to the gas to be welded through the torch, and thereafter, the flip-flop FF 1 force is applied.
• VvIfO Gas is blown to the welded part until it is turned off.
• the processor 101 sets the time t after generation of the gas supply signal equal to the pre-flow time PRD read out to the working memory 104. We monitor whether it was lost,
• the welding start signal WDS and the welding voltage signal (analog voltage) WDV and the wire feed speed signal (analog voltage) WFC are interfaced.
• the decoder DEC 2 determines the end dress signal And output 1 "(high level) to open AND gates AG 21 and AG 22.
• the voltage is applied to the set-side input terminal of the flip-flop FF2 via the 1 "(no, level) force gate AG21. a-flops off Russia-up to set. This ensures that the door run-Soo data TR 2 becomes conductive and relay RL 2 Gado operation of the automatic welding machine AWM, contact r Z 2 of the relay Is closed, and the roller drive circuit RDC for driving the welding power source PS and the wire feeding roller becomes operable.
• a digital analog converter (referred to as a DA converter) DAC 1 — ⁇ ⁇ —
• the welding voltage CMU (digital value) that is read out to the memory 1104 is output to the data path 111.
• the DA converter DAC 1 stores the welding voltage CMU in the built-in buffer register, converts the welding voltage to an analog voltage, and supplies the analog voltage to the welding power source PS of the automatic welding machine AWM. Output.
• Welding power source PS is as long Li les over contact r 2 are close, and outputs a high voltage proportional to the welding voltage.
• the port sensor 101 outputs the address of the DA converter DCA 2 to the address path 110 and the single-keying memory to the data path 111. Outputs the wire feed speed WF (digital value) read to memory 104.
• the DA converter DAC 2 stores the wire feed speed WF in the built-in buffer register and then converts the wire feed speed to an analog voltage. Input to the roller drive circuit RDC of the automatic welder AWM. This ensures that the B over La, drive circuit RDC rotates the motor in limited Ri B over la drive Li les over contact r 2 are close, commanded Wa Lee ya feeding follower at a rate i Feed WR.
• the decoder DEC 3 determines the end signal by the cycle and opens the end gate AG 31 each time. As a result, the arc generation signal ACG force is immediately read by the processor 101.
• the processor 101 counts the elapsed time after the step (g-2), and the elapsed time t is read out to the working memory 104. Monitors whether the creator processing time equals the CFD. -I3-
• processor 101 resets flip-flop FF2. End of data processing). That is, the wire is fed at a predetermined wire feed speed for the creator processing time, and a predetermined welding voltage is applied between the wire and the welding member to melt the wire. Then, the molten droplets are dropped into a crack, and the crater process for embedding the crater is completed. ⁇ , flip-flop FF 2 force; When reset, the output voltage of welding power source PS becomes zero, and the wire feeding stops, and the arc stops. Generation stops. Further, the welding voltage signal W DV and the feeder speed signal W F C are also set to zero. Therefore, after that, only the gas is blown to the member to be welded, resulting in a bottom-flow autumn state.
• Step (gr-6) Thereafter, the processor 101 reads the next block's lo-po and set command data from the RAM 103, and executes the above-described steps. Step (b) and subsequent steps are performed. Then, the same process is repeated thereafter, and the welding process ends if a code indicating the end of the robot command data is read at the end.
• a hall button (not shown) on the operation panel 106 may be pressed, and a restart may be performed by pressing the start button.
• the welding voltage is set to zero volt by pressing the hold button, and the wire feeding is stopped. Is sprayed on the member to be welded (bottom-flow treatment). Then, at the time of restart, the same processing as the welding start processing by S45 ⁇ is executed. In this way, if the post-flow process is performed during a temporary stop and the pre-flow process is performed during a restart, the welded state of the stopped portion will not be lost.
• the welding machine A WM detects the actual welding voltage and welding current, and averages the values.
• the processor 101 has the function of writing to the memory 104.
• VCD is the detection unit (with the detector
• An AD converter is provided), and the voltage value and the current value (digital) output from the detection unit are output from the input / output device 108 at predetermined time intervals. It is taken into processor 101 and integrated. This integrated value is divided by the welding time at the end of welding, and the result of the division is stored as the actual average welding voltage and average welding current corresponding to the selected welding conditions. In this way, by storing the average welding voltage and current during the actual welding operation, these are compared with the next welding voltage and current, and the difference is determined by the predetermined upper and lower limit levels. Is used to generate an end alarm ⁇ ⁇ 5-Yes. It can also be used to correct welding conditions (welding voltage, current) so that optimum welding can be performed by checking the actual welding conditions.
• the present invention is suitable for application to an automatic welding machine using a lot because welding conditions can be easily selected without using a dial.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Plasma & Fusion (AREA)
• Mechanical Engineering (AREA)
• Arc Welding Control (AREA)

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Citations (4)

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• 1982
  • 1982-10-27 JP JP57188739A patent/JPS5978781A/ja active Granted
• 1983
  • 1983-10-27 US US06/841,028 patent/US4647753A/en not_active Expired - Lifetime
  • 1983-10-27 WO PCT/JP1983/000384 patent/WO1984001732A1/ja not_active Ceased
  • 1983-10-27 DE DE8383903313T patent/DE3375092D1/de not_active Expired
  • 1983-10-27 EP EP83903313A patent/EP0124612B1/en not_active Expired

Patent Citations (4)

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