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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
1—Convex Die 2- Die

Figure7--79 Punch height adjustment body
1- Fixed Plate 2-Slider 3- Punch 4- On the mold base 5- Screw
6- Nut
7) There are strict requirements of local relative position within the shape, should consider the possibility of the same station on the out, in order to maintain accuracy. If there are really difficult to be broken down into two working bits. Be better placed in two adjacent stations.
Third, the principle of stamping operations sequencing
1)For pure blanking progressive dies, in principle, the first ,punch, followed by re-punching shape I expected, the final and then washed down from the Strip on the integrity of the workpiece. Carrier should be maintained of material of sufficient strength, can be accurate when sent to press.
2)For the blanking bending progressive die should be washed before cut off part of the hole and bend the shape I expected, and then bending, and finally washed near the curved edge holes and the side hole-bit accuracy of the sidewall holes. Washed down by the final separation of parts.
3) Drawing for the progressive die stamping , first make arrangement to cut processes, further drawing, the final washed down from the article on the workpiece material.
4)For with the deep drawing, bending stamping parts, the first drawing, then I punched the surrounding material, followed by bending plus.
5)For stamping with a stamping parts, in order to facilitate the metal flow and reduce the stamping force, stamping parts of neighboring I expected to be an appropriate resection, and then arrange stamping. The final re -Precision Die-Cut materials .If there are holes on the embossing position, in principle, should be embossed after the punching.
6)For with the stamping, bending and stamping workpiece, in principle, is the first imprint ,And then punching Yu Liu, And then bending process.
Fourth, nesting layout
1) Nesting mapping, you can start with plane launch fig start, right designed to blanking station, left the design forming station. Step by step according to the actual situation after the amendment.
2) Consider increasing the intensity to be an empty station molds. Continuous drawing more frequently when the first drawing after being a backup space industry in order to increase the number of drawing. High precision, complex shape of the workpiece should be less to set an empty station. Step away from the mold is greater than 16mm When more than set up an empty station. Interval accuracy The poor should not be easily added an empty station.
3) Decided to process pieces of carry approach.
4) Note that material rolling direction. Rolling direction affects not only the economic effects of nesting, but also affect the performance of the workpiece.
5) Burr bending parts should be located in inside.
6) Thin material used Guide is being sold, But do not side edge trimming. For thick material or heavy section materials, in order to avoid guide is being sold off the need to side edge trimming.
7) According to the workpiece dimensions and the scale of production to determine a shape one pieces two documents or four parts, or more pieces.
8) Stamping process does not allow any scattered debris left on the die surface.
9) Residual material on the press to consider the possibility of other parts.