Concave hole processing model

1. Type type circular hole with a round hole die has the following two conditions: ( 1) Monotype Kong Ao mode. This kind of die making technology is simple, rough turning (after forging, annealing Or milling) Type and drilling, boring holes, and in the upper and lower plane and type in the appropriate grinding allowance. By bench marking again, all fixed with holes, tapping screw, hinge pin hole, and then quenching, tempering, On the heat treatment after grinding, the plane and hole. ( 2) Polymorphism Kong Ao mode. Continuous die and compound die of blanking die, die has a series of round hole, the hole size and position of each other is of high accuracy requirements, these holes are called pore. To maintain the position accuracy of holes, coordinate method is often used to carry on the processing. Insert structure of die is shown in figure 2. 27. On the fixed plate with a hole on the jig boring machine processing. Vertical double column coordinate boring machine: a table can be on the longitudinal and lateral direction in precise adjustment, most of the workbench mobile reading value of the minimum unit of 0. 001mm； Positioning accuracy generally can reach + 0. 002-0. 0025mm。 Reading method of the movement value of workbench optical type or digital display type can be used. According to the method of coordinate boring on coordinate boring machine, is the conversion between different hole size to rectangular coordinate dimensions, as shown. Alignment method: figure 2. 30 with orientation Angle and optical center tester for alignment. On the same circumference of a circle hole processing distribution, can use coordinate boring machine accessories - — Universal rotary table, as shown in figure 2. 32. The polymorphism of with insert structure Kong Ao mold processing, in the case of lack of coordinate boring machine, also can use the method of machining holes on the vertical milling machine. For this, but in the longitudinal and lateral direction of milling machine workbench additional block gauge, dial indicator measuring device to adjust the workbench mobile distance, to control the hole between the coordinates of the size, the distance accuracy generally can reach 0. 02mm。 In general, type Kong Ao model of the whole structure of carbon tool steel or alloy tool steel as raw material, the hardness after heat treatment is often above HRC60. When the blank manufactured by forging, annealing, on the plane for roughing and semi-finishing, drilling, boring holes. In the upper and lower plane and type in the appropriate grinding allowance, and then quenching and tempering. After heat treatment, grinding, the plane to plane positioning on the jig grinding machine for finishing hole type. Type hole unilateral grinding allowance is usually not more than 0. 2mm。 On type hole boring process, it is necessary to make the hole position accuracy reaches a certain size, otherwise it will create difficulties to coordinate grinder processing. The most ideal method is to use machining center for processing, it can not only ensure each hole between the location of the dimension accuracy requirement, and all the thread on the concave die hole, positioning pin hole machining can be in an installation is complete, greatly simplifies the operation, is conducive to the improvement of labor productivity. Type 2 noncircular Kong Fei circular hole of the concave die is shown in figure 2. 33, mechanical processing more difficult. Due to the development of the CNC wire-cutting processing technology and its widely application in the mold manufacturing, many traditional type of hole processing method is replaced by the technology. Machining is mainly used in wire-cutting processing is limited by the size or lack of wire-cutting processing equipment.