沖壓模具設計中對機械運動的控制和運用-外文文獻

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Stamping mould design of mechanical motion control and use In the stamping process, mechanical motion throughout. All kinds of the realization of the stamping process has its basic movement mechanism, this movement is closely related with the mould, all kinds of die structure design and mechanical design is finally all in order to meet the specific requirements of the movement to realize. The design of the mould can finish stamping process strictly to realize the movement, directly affects the quality of the stamping, so in the mold design of mechanical movement to control. In order to achieve the requirements of the product shape and size, can't get bogged down or confined to various process basic sports mode, and should constantly development and innovation, in the mold design of flexible use of mechanical motion. Abstract: in the stamping process, mechanical motion throughout. All kinds of the realization of the stamping process has its basic movement mechanism, this movement is closely related with the mould, all kinds of die structure design and mechanical design is finally all in order to meet the specific requirements of the movement to realize. The design of the mould can finish stamping process strictly to realize the movement, directly affects the quality of the stamping, so in the mold design of mechanical movement to control. In order to achieve the requirements of the product shape and size, can't get bogged down or confined to various process basic sports mode, and should constantly development and innovation, in the mold design of flexible use of mechanical motion. This paper is based on the basic theory of stamping technology, through various stamping process basic motion analysis, proposed to the stamping mould design requirements. The paper stamping process, mechanical motion of the basic concepts, and then analyzed, item by item, cutting, bending, deep drawing technology, and points out that the basic motion mechanism mold design of should focus on the content of the control to, and introduces in the mold design of flexible use of mechanical motion of the methods and some examples. The conclusion according to the specific situation of product craft movement analysis method, and emphasized in the mold design, mechanical movement to control and flexible to improve design level by stamping and guarantee the quality of the important significance. Cold stamping is of different specifications will be in the process of sheet metal or blank mould and stamping equipment, use (press, another name to pressure the punch), the deformation or separation, access to certain shape, size and performance of the parts. General production is the vertical punch, and decided the main movement of stamping process is up and down movement, in addition, there is the sheet metal mold and die in the structure of all kinds of mutual movement between. Mechanical motion can be divided into sliding, the rotation and rolling, three basic forms of exercise in stamping process, there are various forms of exercise, but the different characteristics, the influence of the stamping is different. Since stamping process is so diverse movement and in stamping mould design for all kinds of sports should be strict control, in order to achieve the mould design requirements; At the same time, in a design should also according to the specific circumstances, make use of various mechanical motion, in order to achieve the requirements of the product. Stamping process is main movement up and down movement, but in the mold of inclined wedge design structure, structure, structure and presenting roller rotary cutting structure etc, can the corresponding main movement into level sports, of die and mould rotation of the scroll. In the mold design of these special structure is more complex and difficult, costs are high, but in order to achieve a product's shape, size requirement, but is a good solution. Cutting craft basic motion is unloading board first contact and sheet metal press a prison, the punch down to the sheet metal contact and continue to fall into the concave die, convex, concave die and relative motion sheet metal sheet to separate, then convex, concave die separate, unloading board the piece or waste from the punch, and complete the lagging on cutting movement. The movement of unloading board is critical, in order to ensure the quality of the cutting, must control the movement of unloading board, make it before the punch and sheet metal contact, and the material force should be enough, or cutting a cut area poor quality, low dimensional accuracy, flatness bad, and even die life is reduced. According to the common method of design blanking punching die, often after stamping workpiece and waste to separate edge. No impact on the premise of workpiece quality, can use in die and punch unloading board adding some protruding set blocks, in order to make blanking punching movement, concave die after the completion of the unloading board first the piece out from the concave die, and die and punch unloading board again from the waste die and punch. So, lagging the workpiece and waste natural separated. For some of the larger local convex stamping, can be in blanking punching die of concave die unloading board type pressure of the punch, and at the same time put enough spring force, in order to ensure that the unloading board pressed the punch and sheet metal contact material deformation are first to pressed purpose, continue to blanking punching, often can reduce sports a work of mold, reduce cost step. Some punching mould punching number, need very blunt, stamping production negative pressure, and even without enough tonnage of punch, has a simple method, it is to use different lengths of 2 ~ 4 batch of punch in stamping, let punching movement points, and can be effectively reduced cutting force. For those in bending surface position precision of the high demand of the hole (such as the two aperture concentricity bending, etc.) of the stamping, if the first bend is difficult to meet again punch a hole requirements, must design the structure of the bending, wedge again after the utilization level of direction, punching punching movement can achieve a goal. For those who turn over the side, deep drawing height stricter requirements need to do trimming process, also can with similar structure design. Bending process basic motion is unloading board first and sheet metal contact and killed, the punch down to the sheet metal contact, and continue to fall into the concave die, convex, concave die and relative motion in sheet metal, sheet metal bending deformation, and then convex, concave die bending concave die apart, on top of the stem (or the slider) to launch, complete edge bending bending movement. Unloading board and top of the stem movement is a key, in order to guarantee the quality of the bending or production efficiency, must first control the movement of unloading board, let it before the punch and sheet metal contact, and the material force must be enough, or bend a size accuracy is poor, poor plane degree; Second, shall ensure that top stem force enough, to make it successfully launched the bending parts, or bend a deformation, the production efficiency is low. For higher accuracy bending part, should pay special attention to a little, best in bending movement, want to have a movement, that all relevant parts dead spots can touch death. Some of the more exotic, or bend shape after bending according to normal way not from concave die off, at this time, often need to use the wedge structure or structures, such as by presenting, inclined wedge structure, can complete less than 90 degrees or back to hook type bending, presenting the structure can realize a forming a cylinder. Be worth what carry is, for some shell parts, such as computer floppy drive enclosure, because of its bending side is longer, elbow and between the sheet metal bending, sliding, in very easy to wipe out soft flocks, materials galvanized layer falls off, frequent polishing curved punch effect is not ideal. It is usually the bending the punch of titanium coating, and improve the finish and wear resistance; Or in bending the punch R Angle place the elbow and embedded roller, sheet metal bending sliding into rolling, because than sliding friction small roll, so not easy scratches workpiece.