Mold Design& Manufacturing

The power press stamping molds/tools are including:

1.    progressive die,

2.    Stage mold (single stage mold),

3.    Transfer mold (with transfer system)

Progressive Die Set Overview

Sheet metal progressive die can complete punching, bending, stretching, forming and other processes until one part is completed.

If the complexity of the stamping is high, the progressive die can sometimes only complete the previous processing in the work piece stamping. The subsequent stamping processing is completed by the stage die.

In the progressive die, before the completion of all processes, the piece and the strip are not separated, the spacing between the adjacent two work steps must be the same, otherwise the material cannot be fed.

Material Utilization

Because the use of progressive die requires a tie-up or side strip, the material utilization rate is lower than the blanking die; so precious metals should not use progressive die; Considering the shape of the product, using appropriate layout methods (some layout methods may make the mold more complex) can also increase the material utilization of the product.

Stamping Material

Materials used for progressive die are generally long strips. If the material is thicker or the production batch is small, the sheet can be used; if the material is thin and the batch is large, consider using the coil. When coil is used, the material can be automatically fed, and the high-speed press can be used for automatic stamping.

Progressive die has strict requirements on the width of the material: when it is too wide, the material cannot enter the guide plate and the feeding is not smooth; if it is too narrow, it affects the feeding accuracy, and it is also easy to damage the mold.

Feeding Method

1. Feed manually. Applicable to the case that the production batch is not large, the material is thick, and the work piece is large (for example, 3.0mm stainless steel work piece). This type of feeding method is not as efficient as automatic feeding.

2. Automatic feeder feeding. It is generally suitable for the feeding of coils in stamping. It is characterized by high feeding accuracy and high production efficiency, which is often used in mass production.

3. Attach a self-made feeding device to the mold, such as small sliders, ratchets and other structures, but generally less used this way.

What is the difference between progessive die, stage mold and transfer mold? 

Continuous die (also known as progressive die, step die) refers to the press in a stroke, in turn in several different positions, at the same time to complete a number of procedures of the die. Blanking parts are gradually formed in the continuous die, continuous forming is a process method of process concentration, can make the edge cutting, incision, groove cutting, punching, plastic deformation, blanking and other processes in a mold to complete. According to the actual needs of stamping parts, according to a certain order arranged a number of stamping processes (called in the progressive die station) for continuous stamping. It can not only complete the blanking process, but also complete the forming process, and even the assembly process, many complex stamping parts that need multi-process stamping can be completely formed on a die, which provides favorable conditions for high-speed automatic stamping. It can be seen that the continuous die is a kind of punching die with many working stations and high efficiency.

Engineering mould (single working procedure mold/ single stage mold), is a single working position, single working procedure mould.It is characterized by a simple mold structure, the need for artificial or robotic arm assistance;So the relative production efficiency is low, mainly used for batch is not large, precision requirements are not high workpiece production.Due to the low cost of the engineering mould and the low requirement on the tonnage of the punch press, the engineering mould scheme is often preferred when making the mould scheme. However, with the continuous cost rising, the engineering mould will be gradually replaced by the continuous mould or transfer mould.

Multi-station transfer mold, generally refers to the use of special multi-station punch, by a number of engineering mold with a certain process connection according to the process sequence installation, a kind of mold delivered by the manipulator. The most important characteristics of the multi-station transfer die (1) in the use of multi-station punch;(2) Each station is a complete engineering model to complete a specific process. Each engineering mold (single station-mold) has a certain connection, each station mold can be adjusted independently, and the adjustment is generally not restricted by the front and back mold;(3) transmission mode: mechanical hand delivery.

Regular Mold Manufacturing parameters

Punching machine

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