In April 2000, our institute was commissioned by the China Automotive Technology Research Center to successfully develop the WB02-300A profiling automatic TI = welding machine. It successfully realized the automatic welding around the clamshell car purifier using two profiling machines. The welding machine is close to the profiling template by the magnetic wheel of the profiling machine, which realizes the automatic tracking of the folded shape. The profiling machine drives the welding gun to walk, and realizes the butt welding of the purifier. The pulse welding method is used to make the welding seam well formed, the welding control is fully automatic, stable and reliable, and meet the requirements of mass production.
Structure of the welding machine This machine mainly includes the mechanical system for profiling welding and positioning and pressing, a reliable electrical control system and the MillerMaxstar300TI = welding machine of the United States. The structure diagram is as follows.
The profile welding and positioning pressing system is to press the periphery of the purifier level to obtain excellent welding quality. The machine is provided with a pressing system with a pressure supply capacity of up to 10MPa.
The profiling walking mechanism is composed of two profiling machines and a profiling template in the middle. The welding gun is driven by the walking of the magnetic wheel close to the model, and the profiling welding around the flanging purifier is realized.
Because there is a 230. corner (see) on the left and right folds of the weldment, a pneumatic system is used to realize an automatic corner (70.) once at each place, so that the welding torch maintains a good welding posture. In addition, the pneumatic system also realizes automatic feeding and returning, which makes the operation safe and reliable.
Main technical parameters: suitable for hemming length range 300800mm, suitable for workpiece thickness 12mm, hydraulic system normal working pressure electrical control system The electrical control system adopts PLC programming, realizes automatic control of each step, reliably and accurately realizes feeding, pressing, walking, starting arc , Corner, arc and other actions, and achieve safety interlocking, such as: feeding can not be pressed in place, the cylinder can not be returned without lifting, etc. In addition to the automatic program start and stop buttons on the operation panel, there is also an intelligent control scheme for step-by-step operation of CO% gas shielded welding. Wang Rui, Zui Derui (Tianjin Business School, Tianjin Modulation and Relay Drive Circuit, to achieve Automated welding processes such as air supply, power supply and wire feeding.
1 Introduction As we all know, C2 gas shielded welding has the characteristics of high efficiency, high quality and energy saving, and has played a wide range of application values ​​in production, but most of its control parts have original and backward features. The control part is generally composed of three parts of functional circuits such as air supply, power supply and wire feed. At the same time, there is a mutual timing relationship between the three when starting welding and stopping welding. The wire feeding circuit adopts the controllable rectification and voltage regulation of single-junction transistor oscillation. The mutual timing relationship uses the timing accuracy caused by the resistance-capacitance charging and discharging timing and dispersion, and the defects of the principle of controllable rectification and voltage regulation. The device as a whole is relatively backward, which does not include the addition of some new functions after the device leaves the factory, the on-site modification of related parameters and other factors that can hardly be achieved. In this regard, a set of intelligent control scheme is proposed.
% The principle of intelligent control scheme The schematic diagram of intelligent control is as shown.
Welding current peak value / p = 19 arc current 1 The implementation method of each JoalEle also connected is worth applying widely. : // Lnet's manual button can be adjusted step by step, easy to debug and check the fault. The block diagram of the electrical control system is shown below.
Operation process The feeding cylinder is in the waiting state / the workpiece is placed on the lower positioning tire in front of the work table / the start button is pressed / the automatic program as shown is executed.
Welding process The shape of the weldment is as shown, the material is 1Cr18Ni9, the plate thickness is 1.2mm, the joint form is termination, the welding position is flat welding, and the process method is automatic pulse TI2 welding. Welding process specifications are as follows: 5 Conclusion The special welding machine has been debugged and used. The quality of the welding seam is excellent, the yield rate is 99 = or more, the control is stable and reliable, and the mechanical structure is clever and reasonable, which is approved by the manufacturer. The machine has high degree of automation and high efficiency, which meets the requirements of manufacturers for mass production, and this type of welding of irregular shapes
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