Single working end swing type automatic electrode grinder for resistance spot welding

Abstract

The invention discloses a single working end swing type automatic electrode grinder for resistance spot welding. The automatic electrode grinder comprises a bracket and a working end frame arranged onthe bracket; the working end frame is internally provided with a working end and a grinding angle compensation system, and the outer side of the working end frame is provided with an electrode positioning mechanism used for electrode grinding; a working end frame floating mechanism is arranged between the bracket and the working end frame; a power input gear, a spline gear, a spline shaft, a ballcage, a gear shaft and a tool rest gear composed of a tool rest and a combined cutting tool are driven by an AC motor in sequence during grinding and cutting; during the cutting displacement of the cutting tool in the grinding process, a screw ball nut, a connecting plate, a support base and the working end are driven by the servo motor in sequence; and the grinding angle compensation system comprises a stepping motor, a worm gear, a bolt tie rod, a connecting block, a hinge pin and so forth. The automatic electrode grinder disclosed by the invention has the abilities of positioning and micro-grinding for the electrode surface, gradually increasing compensation of grinding angles and accurate positioning of electrode grinding positions.

Description

technical field [0001] The present invention relates to the special process equipment for welding electrode grinding in the spot welding process, more specifically, the present invention relates to a kind of electrode grinding which is suitable for linear motion welding tongs and suitable for the spot welding process. The single-working-end swing-type automatic electrode dresser for grinding the electrode of the swing-type welding gun is hereinafter referred to as the electrode dresser; in other words, the electrode dresser of the present invention can automatically repair the coaxial working welding electrode It can also automatically grind the welding electrodes of the non-coaxial working swing welding tongs. Background technique [0002] During the spot welding process, the working surface of the electrode is subjected to harsh cyclic workloads such as high temperature and high pressure. The composition and diameter of the working surface of the electrode, the contact are...

AI Technical Summary

Problems solved by technology

[0005] (2) Various negative attributes of the current electrode automatic grinder due to common processing characteristics: First, the cutting tool rotates around a fixed axis at a fixed position, the rotation axis of the cutting tool coincides with the electrode axis, and the theoretical trajectory of the electrode working surface is processed. First, the helix angle cannot guarantee the parallelism between the two electrode surfaces after grinding and the workpiece surface; second, in order to reduce the adverse effect of dynamic load on the impact of the cutting edge, most of them use electrode pressure to stably establish the rear cutting edge on the cutting edge. The working mode that the eloquence starts to rotate, that is, the cutting edge is carried and started under the action of a large electrode pressure, and the speed increases from zero to the design working speed instantaneously, which has a great impact on the cutting edge; third, from the outer diameter of the electrode to the electrode There is a change in the cutting line speed of the axial cutting edge from V=Vmax to V=0, that is, the cutting line speed and cutting acceleration at the outer diameter of the electrode are the largest, and the impact on the cutting edge is the strongest; The cutting line speed is zero, and the central part of the cutting edge has no cutting effect on the electrode surface. The peeling between the electrode material to be cut and the electrode surface is the comprehensive result of the superposition of the cutting edge rotating rolling and rotating tearing. The uniformity and conductivity of the electrode material, as well as the cutting edge, etc. all have a certain destructive effect; Fourth, in order to remove the metal to be cut at the axis of the electrode, the electrode repeat positioning accuracy error and the coordination required for the cutting edge rotation must be considered. Due to clearance and other factors, the length of the cutting edge must pass through the axis in the design, and the local cutting edge beyond the axis is subjected to harsh conditions such as reverse cutting and hard extrusion during the cutting process, which is extremely unfavorable to the working life of the cutting edge; fifth, repeated positioning errors The precision will cause the offset of the pressure center, and the offset of the pressure center will use the matching gap to make the electrode grinding surface form a certain processing deflection angle relative to the workpiece surface, which will intensify the non-parallelism between the electrode working surface and the workpiece surface, and further affect the electrode. The relative stability of the cross-sectional area of ​​the feed and the quality of the solder joints all constitute adverse effects; Sixth, due to the large impact stress on the cutting tool during the electrode grinding process, the sharpness of the cutting edge is limited, and it also limits the sharpness of the cutting tool edge. Cutting ability of small amount of knife in the mouth, excessive cutting is called the absolute main body in each grinding amount of electrode

[0006] (3) The amount of grinding is determined by the relationship between the three parameters such as the grinding time, instead of controlling the cutting amount of each grinding through the grinding displacement, it is difficult to effectively control the excessive cutting of the electrode material

[0007] (4) Since the existing automatic electrode grinders do not have the function of automatic angle compensation step by step, when grinding the electrode of the swing welding gun, the unevenness between the working surface of the electrode after grinding and the surface of the workpiece will be gradually enlarged

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