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The rationality of the structure of cold stamping mold planning plays a crucial role in the success of precision metal stamping production. Even a simple set of mold components can reach dozens, so their accuracy cannot be underestimated when planning.
At the beginning of planning, what kind of mold structure was chosen? Is it a pre mold structure (i.e. a concave mold device located on the mold base)? Is it still an inverted (reverse) mold structure (i.e. the convex mold on the device's base)? Or choose a single process mold structure? Should we still choose a composite mold structure? This is a topic worth in-depth discussion in front of every mold worker, and it is a great article.
When to select the positive mold structure
Structural characteristics of front mounted molds
The structural feature of the front mold is that the concave mold device is located on the base of the lower mold. Therefore, the workpiece or waste material can easily fall into the waste hole on the punching table, whether used for workpiece drop, punching, or other processes.
Therefore, when planning the main mold, there is no need to consider the activity of workpieces or waste materials. This leads to a very simple and practical tool structure.
Advantages of Forward Device Mold Structure
(1) Because the mold structure is simple, it can shorten the mold production cycle, which is conducive to the development of new products.
(2) More convenient to use and protect.
(3) The installation of convex and concave molds and the adjustment of gaps are simpler (compared to reverse molds).
(4) The low cost of mold production is beneficial for improving the economic benefits of enterprises.
(5) Because compression force always exists throughout the entire stretching process, it is suitable for stretching non rotating body parts.
Disadvantages of Forward Mold Structure
(1) Due to the accumulation of workpieces or waste materials in the concave mold hole, the lifting force of the group in the concave mold hole is added. Therefore, it is necessary to add wall thickness to the concave surface to improve its strength.
(2) Due to the accumulation of workpieces or waste materials in the concave mold holes, it is necessary to machine the concave mold edge with a drop slope. In some cases, it is necessary to machine the reverse holes (discharge holes) at the mold edge, which prolongs the mold cycle time and adds to the mold processing cost.
Principles for selecting positive mold structures
In summary, we can see that the planning principle we should follow when planning precision metal stamping molds is to prioritize the positive mold structure. Only when the front mounted mold structure can meet the skill requirements of the workpiece can other mold structures be considered.