Large press manufacturers for you to analyze how to make our market demand to be better met?
The positioning surface of the positioning element of the large-scale press has allowance, and the positioning surface can be finely ground after the fixture is installed. This method is adopted for supporting plate and supporting nail. In order to make the support reliable, the press often uses four, six or more support plates (or support nails) to support the workpiece. Therefore, the top surface of the press must be strictly kept in a plane. By using the method of fine grinding the positioning surface after assembly, the positioning datum dimension can be obtained directly from the processing by the press, so the accuracy is very high. This method does not directly affect the positioning datum of the fixture, but the press must ensure that the assembly error does not exceed the range of fine grinding allowance. In addition, the datum must be reground when replacing the positioning parts. This method is mostly used in the datum plane of precision fixture to obtain high positioning accuracy.
Finally, the fixture of large pressure locomotive is positioned with Morse cone, and the datum plane of workpiece positioning is finely ground to ensure the coaxiality of 0.007mm. In order to ensure the accuracy of the relative position between the machine tool and the fixture, the machine tool is used to process the fixture. Lathe fixture for machining rocker. The maximum diameter of the rocker of the press is 3, and the length is 108 mm. It is a slender shaft. The end face of the press is not allowed to have a top hole. The raw material is cold drawn steel wire, and the outer diameter and roughness are good. Press this process turning lure 2 cylindrical fixture is like a tool holder, installed on the lathe carriage, press with two locating pins to determine the relative position of the fixture and carriage, and fixed with screws. One end of the work piece of the press is driven to rotate by the clamping belt of the spring chuck on the lathe spindle, and the other end of the press extends through the hole of the fixture. In the process of machining, the fixture moves with the tool holder. When the press requires the function of the fixture to be coaxial with the lathe spindle rotation center, the locating hole 3 must be cut directly on the lathe and positioned on the square tool rest with two locating pins. Therefore, when using each time, as long as the positioning pin is re installed, the press can ensure that the holes on the fixture are coaxial with the turning center of the lathe.