Mold and method for sectionally adjusting cooling efficiency of the mold

Abstract

The present invention provides a method for sectionally controlling a cooling efficiency of a mold. The method comprises steps of: (a) configuring at least a cooling passage including a first section having a first heat-dissipating inner surface area and a second section having a second heat-dissipating inner surface area in the mold; and (b) adjusting the first and the second heat-dissipating inner surface areas unequally by using a heat-dissipating element.

Description

FIELD OF THE INVENTION[0001]The present invention claims the benefits of priority from the Taiwanese Patent Application No. 100142109, filed on Nov. 17, 2011, the contents of the specification of which are hereby incorporated herein by reference. The present invention relates to a mold and a method for adjusting cooling efficiency, particularly a hot-stamping mold and a method of sectionally adjusting the cooling efficiency of the hot-stamping mold.BACKGROUND OF THE INVENTION[0002]The production method for a cooling water passage according to the prior art is to drill a mold to form tunnels therein for allowing cooling water to flow in the tunnels. Due to the physical limitations of the drilling machine, each of the tunnels formed in the mold is in one direction, i.e. strait lines. However, the contours of a mold are usually curvature. Thus, the distance between the cooling water passages made by drilling inside the mold and the outer surface of the mold cannot be constant, which re...

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Benefits of technology

[0006]To overcome the abovementioned defects of the prior arts, the present invention provides novel structural designs of the cooling passages for sectionally adjusting the cooling efficiency of a mold, without changing the density of the cooling passages or the cooling water flow rate. The present invention unequally adjusts the heat-dissipation rate or cooling efficiency at different portions of the mold by changing the heat-dissipation surface of the cooling passages at different areas so as to obtain different mechanical properties such as hardness and strength of the products at different areas thereof.

Problems solved by technology

Due to the physical limitations of the drilling machine, each of the tunnels formed in the mold is in one direction, i.e. strait lines.

However, the contours of a mold are usually curvature.

Thus, the distance between the cooling water passages made by drilling inside the mold and the outer surface of the mold cannot be constant, which results in deficiencies such as inhomogeneous cooling effect at different areas and ineffective temperature control during a hot-stamping process using the mold.

The allocation design for those cooling passages according to the prior art is focused the effect of heat release only, but never considers an improvement for homogeneous heat transferring during and after the hot-stamping process which requires precise calculations for better structure designs of the cooling passages.

Consequently, the use of many of these hot-stamping molds results in even mechanical properties of the products, or even causes deformations or cracks of the end products.

However, such methods involve exhausting calculations for determining the metal mold dimensions based on the cooling speeds, and are not applicable for producing products with different mechanical properties at various portions.

Besides, with the restrictions of the shape of the mold, sometimes it is not applicable to increase the density of cooling tunnels inside the mold.

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