Now with the processing needs of many different new materials, for some bending machine molds, in order to be able to process well, it is necessary to pay attention to many aspects when purchasing. Let's take a look at it together. Purchase requirements.
First, the bending machine mold is roughly composed of four parts: upper mold, lower mold, guide rail and mold base. The angle is divided into three specifications of 88°90° and 30° (except for special molds)
Upper mold part: straight sword, straight sword (large, small) scimitar, gooseneck (large, medium, small) curved knife, 30 degree sharp knife, flattening knife, simple mold, special mold, arc cutter and so on.
Lower die part: double V-groove V4-V7V5-V9V6-V10V7-V11V8-V12V15-V18 and so on.
Single V-groove V4 V5 V6 V7 V8 V10 V12, etc.
Mold base: single slot die holder and double slot die holder. There are three types of low-station (55cm) medium-station (75cm) high-station (135cm).
Second, different materials because of their different structures, the tools used are not the same, the resulting acid and alkali resistance, tensile strength, material hardness, tensile coefficient, plasticity, etc. are not the same. When selecting a mold, it can be reasonably selected according to the pressure, structure, material, workpiece unfolding size, process requirements, surface treatment, etc. of the machine tool. Under normal circumstances, the width of the slot of the iron plate can be selected to be 5-6 times the thickness of the material, not less than 4 times and not more than 8 times. The notch of the lower die of the stainless steel is 6-8 times the thickness of the material, not less than 5 times. Aluminum, copper can be selected as the lower die is 8-10 times the thickness of the material (should prevent cracks on the surface when bending).
Third, the choice of the upper mold is based on the avoidance of the workpiece, avoiding the nail, avoiding the nut and other structures to make a reasonable choice. The workpiece needs to choose the machete or the left and right ear knives when avoiding the left and right, or use a special mold.
The lower die selects the lower die or the lower die according to the shape of the workpiece, and is mainly used for avoiding bits and avoiding nails. When the size of the workpiece is smaller than the conventional size and the unfolding size is small, it can be completed by the eccentric method of the lower mold under the premise of safe production, and the reasonable eccentricity is 1/4 of the width of the V groove.
When the ratio of the V-groove to the material thickness is 6 times, the expansion dimension of each unit (1 mm) for each increase or decrease should be increased or decreased by 0.10 mm. There is no significant change when it is increased to the limit.
The selection of special molds is based on the shape, performance, size, appearance and safety height of the machine, and the pressure of the machine. The adjustment of the step mode is to control the size of the workpiece according to the size of the workpiece segment to adjust the amount of filler in the middle of the mold.