A. The molding die should have a mold closing guide post, and the stripping structure of the swing rod should have an ejector pin. The locating block on the inner stripper plate is fixed with screws or locked on the inner stripper plate from the side to prevent the product from being scratched. For example, the inner hole of the product is Φ 4 mm, the single side of the positioning hole is +0.005mm, and the grinding head of the positioning pin is Φ 3.9 mm. The positioning hole is punched by the first project, and the precise positioning edge shape is+0.03 mm. The material is SK3 or SKD1/,and the heat treatment is 58HRC. When the roller is molded, the upper molding block retreats inward by 0. 1mm, and the position of the lower molding block remains unchanged. The molding gap t+0. 1mm is used to prevent the product from being scratched. The two end faces of the lower die forming block are tapped with locking blocks or fixed rollers with a gap of 0. 1mm for the rollers to rotate. B. If the moving blocks of the lower die of the flattening die and the swing forming die have strength, a waist-shaped hole pin can be set to replace the limit slide rail and the side rail, thus saving die materials; The rebound angle of the upper swing molding block is 3-4 degrees, and the molding surface of the lower die moving block is outside the (semi-circular) material thickness; If the food is crushed, the lower die moving block should retreat. When the round aluminum material is bent, the movable block of the lower die can be designed as a hard plastic turntable for molding. C convex hull with complex structure shall be indicated in the closed wireframe of on-line cutting, and the upper and lower dies are provided with ejector pins. The back pressure of the special-shaped convex hull is 0.2mm, the two ends of the special-shaped convex hull are cut by wire, and the rest are polished and discharged. During convex hull forming, ribs are designed on the forming block to prevent drawing, and the compound die is opened after convex hull forming. D. Pull up the deep convex hull, use a small stripper for the lower die, and use the front waste as a fixed insert. Convex downward. The convex punch is cut off from the stripper plate to be used as a cushion, and the bottom surface is chamfered along the circumference. The waist convex punch is equal to or smaller than the opposite 0.5t, and the lower die is designed with an ejector pin. The stripper plate is not cut when it is pressed back. E. The bridge site shall be punched upwards, the lower die shall be made into movable inserts, and the waste with the reverse side of +0.02mm shall be kept as fixed inserts for leveling. Stripping pins are designed at both ends, not at the knife edge side (including semi-cutting tongue and convex hull); There is an insert with downward lettering on the stripper plate, and the height of the protrusion is 0.2~0.3mm, which should be designed as foolproof (asymmetric). F. If there is a hole in the convex package or a hole near the forming block, it can be milled on the insert; If there is a punch hole near the elbow or tooth extraction on the wall, preset line pressing and cut the trapezoidal taper of 100; When bending, the line pressing must be straightened; At the corner of the grinding line, the insert can be excavated to be discharged. G. The salad hole or punching hole is close to the material edge, and the insert is designed as a pipe position to prevent the hole from being extruded and deformed; The trimming material is extruded outward, and the trimming process can be designed in addition to the plug. H. Pre-punching should be considered in tooth extraction. One side of M3 tooth lower die +0.02 is provided with φ 4 ejector pin, 8-32 teeth are pre-punched φ 2.5, the punch φ 3.75 and the bottom hole φ 4.75. The tooth extraction punch is 3mm longer than the punching punch. When pulling teeth upwards, the lower die should be customized with φ 10 movable bushing, and the inner hole should be ground in sections to show the tolerance. The punch for tooth extraction should be sheathed with a φ 6 or φ 8 tan spring, and the spiral teeth should be stopped when the tap is M 10 or M 12. First, the rivet φ 6 is pre-punched φ 6. 1mm, the rivet die is downward, and the lower die is φ 6. 1mm, with a 6mm thimble inside. Salad hole double-sided pre-punching +0.5mm, Salad hole ensures the lower end face; Another method of salad hole is to press the cone first. The slope of the trapezoidal part of the product section increases by 0. 1mm at the side of the punch section, the inner hole of the lower die insert is the lower end face diameter, and the shallow salad inner hole is the lower end face d-0. 1. Step 2: punch holes, with deep salad punching d+0.2 and shallow salad punching d+0. 1. Deep salad can also be divided into three steps: first, pre-punch D-0.5 at the lower end; Step two, punch a conical hole at that top; Thirdly, for punching soft materials such as D..j copper and aluminum, or thick materials above 1.5mm, or dies with punching tonnage above 1 10T, grinding grooves should be set on the back of the stopper or stripper. K due to the small tolerance of thin materials, the upper-middle tolerance is adopted for punching to prevent the size of the first piece inspected by customers from exceeding the upper tolerance limit. L the blanking gap between nonmetallic materials and fine blanking die is extremely small, and the gap is 0 or negative. For example, the material thickness t=0. 1mm, and single-sided cutting can be designed to be+0.002 mm; Template adopts ball steel plate double column template; The lower die of stripper plate adopts oil-free (straight) guide post (sleeve), and the upper die of stripper plate is clamped by punch, cutting one and filling three; The flatness of each plate is controlled within 0.005 mm m. For aluminum shell products, the drawing process includes rough drawing and fine drawing, and the flip-chip composite die structure can be adopted. First, the height of the limit column is different. The thickness of the protruding material in the rough drawing is t-0. 1mm, and the height of the protruding drawing in the fine drawing is 1mm. Secondly, the negative clearance in deep drawing is different. In rough drawing, the unilateral clearance is -0.02. For example, the inner stripper plate is increased by 0.5mm according to the 3D shape, and the punch of the lower die is increased by 0.52mm according to the 3D inner shape. When the drawing delay is completed, the unilateral gap is--0.07mm. If the inner stripper plate is 0 according to the 3D shape, the punch of the lower die is increased by 0.07mm according to the 3D inner shape. Thirdly, during rough drawing, an internal stripper is integrated; In the process of fine drawing, the inner stripper plate is partially stripped. Both the inner stripper plate and the lower die punch are provided with stripper inserts with 2-φ 3 exhaust holes, and the upper and lower clamping plates are fixed with grinding exhaust grooves. N. The cutting and pre-folding directions of the blasting die (called the blasting die) should be consistent with the molding direction, and the tongue base should move inward to ensure that the cutting is in place without cutting; When pre-folding upward, the tail should be as high as possible above the die surface to prevent deformation and indentation; Pre-bending N-type or W-type, because the upper die has a long stamping stroke and the pipe is not in place, inserts can be designed on the stripper. O for products with a thickness greater than 0.5mm, when designing the chamfering process of 0.2~0.3mm, the molding insert can be designed to be 0.5mm higher than the template plane and 0.5mm smaller along the shape of the product, or +0.5mm outside the inner hole if it is an inner hole. The slider or ejector pin should be designed around the molding insert. P. The black leather without surface treatment is 0. 15mm thicker than the actual plate, and pay attention to the bending gap; Sheet metal forming stamping is used as a bending line to facilitate die repair. Q. Pay attention to whether there is a design reverse error in the locking position and forming direction when completing the punch insert and forming block; The through hole of the stripper should refer to the fixed hole of the punch of the upper die, and the stripper should not be used as the drawing benchmark; Revise the drawings based on the following templates, and at the same time, pay attention to modify the upper stripper and upper splint.

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