Main Parts, Function and Safety Requirements of Mold
1. The convex and concave mold of the working part is the working part that directly shapes the blank, so it is the key part on the mold. Concave die is not only precision and complex, it should meet the following requirements:(1) should have sufficient strength, can not be broken or damaged in the stamping process.(2) the material and heat treatment should be appropriate requirements to prevent the hardness is too high and brittle.
2. Positioning parts Positioning parts are parts that determine the installation position of blanks, including positioning pins (plates), stop pins (plates), guide pins, guide plates, fixed distance side knives, side presses, etc. When designing positioning parts, it should be considered that the operation is convenient. There should be no over-positioning. The position should be easy to observe. It is better to use forward positioning, outer contour positioning and positive pin positioning.
3. Presentation, unloading and discharging parts Presentation parts include blanking ring, pressing plate, etc.
The blank holder can press the edge force on the drawn blank, thus preventing the blank from arching under the action of tangential pressure and forming wrinkles. The function of the pressing plate is to prevent the blank from moving and bouncing. The function of the ejector and the discharge plate is to facilitate the discharge of parts and the cleaning of waste materials. They are supported by springs, rubber and air cushion push rods on the equipment, and can move up and down. The ejection parts should be designed with sufficient ejection force, and the movement should be limited. The stripper plate shall minimize the closed area or mill free hand slots in the operating position. The exposed discharge plate shall be provided with protective plates around to prevent fingers from entering or foreign matter entering, and the edges and corners of the exposed surface shall be obtuse.
4. Guide parts Guide posts and guide sleeves are the most widely used guide parts. Its function is to ensure that the male and female dies have accurate matching clearance during stamping work. Therefore, the gap between the guide column and the guide sleeve should be less than the blanking gap. The guide post is arranged in the lower die base to ensure that the upper end surface of the guide post is at least 5 to 10mm above the top surface of the upper die plate at the bottom dead center of the stroke. The guide post should be arranged away from the module and the pressing plate, so that the operator's arm does not need to cross the guide post to feed and take materials.
5. Supporting and clamping parts include upper and lower templates, die handles, male and female die fixing plates, backing plates, stoppers, etc. The upper and lower templates are the basic parts of the stamping die, and other parts are respectively installed and fixed on it. The plane size of the template, especially the front and rear directions, should be compatible with the parts. Too large or too small is not conducive to operation.
Some molds (blanking and punching molds) need to be provided with backing plates under the mold base for convenience of production. At this time, the base plate is preferably connected with the template by screws, and the thickness of the two base plates should be absolutely equal. The spacing of the backing plates shall be subject to the parts that can be produced, and should not be too large to prevent the template from breaking.