4results about How to "Small shape error" patented technology

The invention provides a clamp for preparing an impact sample notch by using an optical curve grinding machine and the optical curve grinding machine, and belongs to the technical field of optical curve grinding machines. The jig of the present invention comprises: a base plate; a base; the lower chuck is arranged at the lower part of the base and on the bottom plate; one end of the upper chuck extends into the base and can slide in the base, and the other end of the upper chuck is located outside the base; the spring compression head is located in the base, and one end is connected with one end of the upper chuck; one end of the ejector rod extends into the base, and the other end of the ejector rod is located outside the base and used for extruding the other end of the spring compression head. The spring compression head is driven by the ejector rod to drive the upper chuck to move, so that the device can adapt to different sample sizes, and meanwhile, machining of various machine tools such as an optical curve grinding machine is facilitated. The optical curve grinding machine comprises the clamp and the grinding wheel dresser. According to the shape of the grinding wheel trimmed by the grinding wheel trimmer, errors of the shape and the size of a machined impact notch can be smaller, and the impact test result is stable.

The utility model relates to the field of longitudinal welded pipe welding, and discloses a self-adaptive compression anti-deformation device for longitudinal welded pipe welding, which comprises a workbench, the top of the workbench is fixedly connected with a limiting cylinder, the left end of the limiting cylinder is fixedly connected with a motor I, the output end of the motor I is fixedly connected with a cross rotating rod, and the cross rotating rod is fixedly connected with a rotating shaft. A sleeve is slidably connected to the outer wall of the cross rotating rod, a circular block is fixedly connected to the right end of the sleeve, a limiting cylinder is rotatably connected to the outer wall of the right end of the sleeve, a limiting groove is formed in the inner wall of the limiting cylinder, a sliding block is slidably connected to the outer wall of the limiting groove, and a supporting plate is fixedly connected to the top of the sliding block. According to the utility model, the self-adaptive support of the support plate on the welded pipes with different inner diameters can be realized, the welding seam deviation caused by stress deformation or position deviation of the welded pipes in the welding process is avoided, the positioning accuracy before welding is improved, meanwhile, support parts with different specifications do not need to be replaced, and the universality of the equipment on the welded pipes with various pipe diameters is enhanced.

This utility model relates to the field of machining technology, specifically disclosing a positioning fixture for quickly clamping gears. The positioning fixture includes a positioning shaft and an inner pull rod. One end of the positioning shaft is configured to fit a central hole and is connected to the inner pull rod; the other end of the positioning shaft is used to connect to a gear. The inner pull rod is disposed in a guide hole of the positioning shaft and is detachably connected to the inner pull rod. When the inner pull rod moves away from the tailstock, the end of the positioning shaft tightens and securely connects to the gear. When the inner pull rod returns to its original position, the end of the positioning shaft retracts, allowing the gear to disengage from the positioning shaft. This solves the problem in the prior art where existing fixtures cannot efficiently and stably clamp gears, resulting in low production efficiency and poor quality stability of precision gears.

A NURBS curve interpolation method based on elliptical arc fitting belongs to the technical field of interpolation of numerical control systems. The present invention solves the problem that the existing numerical control processing methods have low fitting accuracy for spline curves and the large amount of calculation required for spline curve interpolation, resulting in low interpolation efficiency. The method of the present invention is specifically as follows: Step 1, after segmenting the spline curve for numerical control processing, elliptical arc fitting is performed on each segment of the curve in turn to obtain the elliptical arc fitting results corresponding to each segment of the curve; Step 2, the elliptical arc speed is planned according to the length of the major semi-axis, the length of the minor semi-axis, the expected speed and the maximum acceleration allowed by each coordinate axis of the fitted ellipse; Step 3, according to the speed planning, the starting point and end point of the elliptical arc required to be completed in each interpolation cycle are obtained, and then the elliptical arc is interpolated. The method of the present invention can be applied to the technical field of interpolation of numerical control systems.