冲压模具外文文献教程文件

冲压模具外文文献

Progressive Die

Progressive die has the following advantages

1) Class into the module is multi-process dies, in a mold can include punching, bending, forming and drawing a variety of multi-pass process, with a higher than the compound die labor productivity, but also can produce quite complex stampings;

2) Progressive Die Operation Security, because staff do not have to enter the danger zone;

3) Class Progressive Die Design, The process can be distributed. Do not focus on one station , there is no Compound Dies "Minimum wall thickness" problem. Therefore relatively high mold strength, longer life expectancy.

4) Progressive Die Easy Automation That is easy to Automatic

feeding ,Autoout of parts Automatic lamination;

5) Class Progressive die can be High-speed press production, because the workpiece can be directly down the drain and waste;

6) Use Class Progressive die can be Reduce the presses, semi-finished products to reduce transport. Workshop area and storage space can be greatly reduced.

Progressive Dies The disadvantage is that complex structure, manufacturing of high precision, long life cycle and high costs. Because of progressive die is a To the workpiece, the shape of successive out, each punch has a positioning error, is more difficult to maintain stability in the workpiece, the relative position of the one-off appearance. However, high precision parts, not all contours of all, the shape relative position requirements are high, you can be washed in the shape of the same station, on the relative position of demanding the same time, out of this part of the profile, thus ensuring precision parts.

First, process pieces of carry approach

Processes and the determination of nesting is of the progressive die design a very important link. In considering the processes and nesting, we must first consider the process method of carriage parts.

Bending parts there are two main ways to carry:

1) Blanking station in the upper and lower pressure, so that after blanking process pieces and re-pressed into the material inside. Generally only about access to material thickness of thel/3, but has enough to process pieces with the material sent to the next process, within the workpiece in the working procedure have all been pressed into the material inside the remnant. Beyond that, after process pieces are washed curved shape, until the last escape from the Strip. The drop in this way conveying pairs of thick material is very effective, because the thin material easy to bagging, wrinkles, or bent, thus blanking out the flat blank song, not with the advance of material and stops in a station caused the accident.

Simple blanking progressive die, sometimes in order to ensure that the workpiece is flat and has also taken off after the re-feed materials put

pressure on people within the approach, in the latter process to workpiece pushed. Because blanking after being re-pressed into the workpiece can not be material in the thickness direction all entered the hole, so in the blanking die station after the plane, to the corresponding lower.

2) Rush to need to bend some of the surrounding material, the rest of the parts remain in the article (Volume)Materials, there is no separation. As the hub of to the material, You may need to spend a long Progress in distance delivery.

Second, the principle of work arrangements

1)Blanking the workpiece to avoid the use of complex shapes convex mode. Rather more than the increase a process to simplify the convex mode shapes.

2)"U"-shaped pieces can be divided into two out, as Figure7--76As shown in order to avoid material stretched, out of Workpiece dimensions vary.

Figure7--76 U shaped pieces of curved process

3)In the asymmetric bending, the workpiece slide easily can be shown in Figure7—77shown with teeth inserts were inserts into the bend Convex Mold and roof in order to prevent the workpiece sliding. The main disadvantage of this method is the a)After the procedure b)pre-process workpiece plane with prints. Also available on the heat treatment before Convex Mold and roof pre-perforated, after tryout after the sheet metal through the tryout will be two holes without sliding inlay Ping . If sliding is used tooth inserts.

Figure7--77 To prevent the sheet metal bending generated when sliding

1- Bending Convex Die 2- Cut off Convex Die 3- Roof 4- With teeth inserts 4) Bending or deep drawing of the workpiece, high-quality plastic surgery procedures should be added.

5) Waste, such as continuous, should increase the cutting process, using waste cutter cut. Automatic press itself, as some waste cutter, you do not have to die to consider.

6) Can be countersunk head hole punching. Figure7—78 shows the first hole punching of the workpiece . When clamping the punch die Xiaoping Tou both plane and concave hole stretch of artificial parts, and contact with each other in order to prevent inward deformation of holes. Clamping direction due to the strict size requirements, so the punch assembly when subject to a high degree of repair potential. Also can be used as shown in Figure 7-79 height adjustment body punch. The upper punch 3 face, contact with the slider 2. Slider right-hand side has opened a T-shaped slot to accommodate the screw 5 in the head. Rotating screw 5, then move along the slider 2. As the slider 2 and the mold base 4 in order to ramp contact with each other, while the punch 3 in the fixed plate is sliding in with l, consequent punch in the direction of the location of mold can be adjusted. Adjusted with the nut 6 fixed

.

Figure7--78 Stamp shen head hole