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

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)

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