Edit Content

Dongguan Jinchen Precision Mold Co., Ltd. is a manufacturer specializing in high-precision mold parts processing and technology research and development. It has more than ten years of production experience and has solved many supply and technical problems for customers.

Our Contact

3.EDM control

(1) Preparation for wire cutting processing: For wire cutting, a precision slow-moving wire cutting machine tool is used, with a processing accuracy of ±0.002mm and a roughness Ra=0.2um. Select a deionized waterline with high deionization degree and the verticality of the cutting wire meets the processing accuracy requirements. The wire material used for cutting with moderate tightness is adapted to the material of the workpiece to be cut, ensuring reasonable processing speed.

(2) Processing route design: Wire cutting processing destroys the original stress balance of the material during the processing, causing stress concentration at the corners. The method to deal with the stress concentration is to use the vector translation principle and leave 0.8~0.9mm before finishing. The remaining amount is pre-processed to roughly shape the cavity, and then heat treated to release the processing stress as much as possible before finishing to ensure thermal stability. When processing the punch, 4 passes of cutting are used. The cutting position and path of the cutting wire must be reasonably determined. The position of the blank should be selected after the first pass of cutting. The workpiece should not be in a cantilevered state. The workpiece should always be in a good stress state without affecting the Subsequent processing: drilling holes and threading wires on the blank, and the processing accuracy is guaranteed to be 0.002mm.

(3) EDM forming process: EDM forming requires the production of rough and fine electrodes respectively. Precision electrodes are processed with CNC machine tools. Cu-W alloy electrodes have good overall performance and less electrode loss than copper electrodes. Under good chip removal conditions, they can process difficult-to-machine materials and parts with complex cross-section shapes; Ag-W alloy electrodes It has better performance than Cu-W alloy electrode and is used for precision machining; graphite electrode uses imported graphite with low loss, high hardness, fast electric corrosion rate and low surface roughness. Arrange precise trimming before the end of EDM to remove the thin hardened layer formed on the surface.

4.Surface treatment and mold assembly

(1) Surface treatment: After finishing, the surface of the workpiece has no pores, uniform hardness, small differences in anisotropic properties, low inclusions, and no tool marks and grinding marks left during machining on the surface of the part where stress is concentrated. Through polishing, grinding, and bench grinding, the unnecessary edges and sharp-angled holes of the workpiece are blunted. After electrical machining, the surface becomes off-white and 6~10m of modified hardened layer is removed. This layer is brittle and contains residual stress. The hardened layer must be fully eliminated before use. .

(2) Mold assembly: Before assembly, the workpiece must be fully demagnetized and the surface cleaned with ethyl acetate. During the grinding and electrical machining process, the workpiece will be magnetized to a certain extent and has weak magnetic force, which can easily absorb some small debris for assembly. In the process: Fully understand the structure and technical requirements of the assembly drawing, and assemble various parts; correctly list the assembly sequence of each component; check the dimensional accuracy of each component, and clarify the coordination requirements; assemble all required Assembly tools; first assemble the guide posts, guide bushes and cavity forming block components of the mold base; assemble the template and combine the punch and concave molds to adjust the position of each plate; open and close the mold to check whether the mold action is accurate and reliable.

Leave a Reply

Your email address will not be published. Required fields are marked *

Get In Touch