Hardware cutting mold structure and design considerations

Cutting processing is a cutting and separation processing method that does not produce waste. When using this method, the utilization rate of materials can be maximized. However, because the mold is subjected to unilateral force, there are still many situations that need to be noted in mold design

The basic structure of the cutting die is shown in Figure 1. The material is cut through the guide groove of the fixed discharge plate while being pressed against one end. The processing schematic is shown in Figure 2:

The burrs on the left and right parts after cutting are in opposite directions and directly remain on the workpiece (refer to Figure 2). This is the first question. Another issue is the use of a straight line for cutting, where the material on the concave mold bounces up due to the bending moment generated during processing, while the front end of the cut material is poured downwards. Unable to maintain a flat state for cutting, so the incision becomes oblique. This is the second issue

There is no solution regarding the direction of burrs

Regarding the issue of the incision becoming oblique, a smaller cutting gap can be set compared to conventional methods. Even if the gap is reduced, if the punch moves due to lateral force during processing, the gap will become larger and meaningless. To avoid punch movement, it is necessary to use supporting protrusions or blocks to prevent punch movement

As a proactive measure to prevent material tilting during cutting, a pressure device (back pressure) can be installed inside the concave mold to clamp the material using the convex mold and back pressure device, avoiding material tilting during cutting. At the same time as installing the back pressure device inside the concave mold, changing the discharge plate from a fixed discharge plate to a movable discharge plate is also a solution. Although this may lead to increased costs

Although cutting processing may seem simple, achieving a smooth finish is actually very difficult. When using cutting processing, a certain width is used for cutting, and the processing force can be balanced. However, cutting processing is a single-sided cutting, so the processing force is unbalanced, which can easily cause problems. This needs to be considered when designing the structure

The above content comes from tutorials such as textbooks. Now let's take a look at a set of examples:

This is a cutting mold for angle iron. The material thickness is 3.5mm. From the structure shown in the picture, it can be seen that the cut part is in the shape of a strip. If you believe in the structure, everyone can understand it. Let's take a look at the lower mold part:

The two separate lower molds on the right serve as blocking blocks

Cutting molds is generally used in production and is also a common type of mold. The most important issue we need to pay attention to is to ensure that the upper and lower molds are not moved. Because it is a single-sided cutting, in general, we will use the upper mold with a knife or the lower mold with a stopper

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