JPS59120410A - Mold structure - Google Patents

Abstract

PURPOSE:To obtain a mold simple in structure, easy to change indications of manufacture and mold history, poor in burrs and low in cost by a method wherein hollows are formed on the cavity side of the mold and charged with low melting point alloy and historical indications such as figures etc. are engraved on the surfaces thereof. CONSTITUTION:Hollows 6 for indication are formed on the prescribed positions to indicate the history of a molded piece on the cavity side 2 of a metal mold 1 to mold high molecular material such as rubber, synthetic resin, etc. and said hollows 6 are charged with low melting point alloy 7 (such as Wood's alloy etc.) higher in melting point than molding material in molding time as it is melted, cast and cooled and historical indications B such as figures, marks, etc. are engraved by a taken etc. to obtain the desired mold. Undercuts 8 or female thread 9 can be provided on the inside walls of the hollows 6 for indication so that the low melting alloy 7 does not separate easily from the hollows 6 for indication.

Description

[Detailed Description of the Invention] This invention relates to a mold structure for molding polymeric materials such as rubber and synthetic resins, and in particular displays history such as manufacturing date (hereinafter simply referred to as history) on the surface of the molded product. This relates to the structure of the history display section for.

Conventionally, when displaying the history on a molded product, the history display part of the mold had a core structure, and history numbers and the like were formed on the surface of the core. For example, as shown in FIG. 4 and the surrounding cavity surface 2. There was one in which the surrounding display Δ of numbers, letters, etc. was used to display history in four steps or in convex steps.

In J3, which is a conventional example, the mold structure is complicated, so the mold cost is high, and the molded product tends to have cracks due to gaps around the surface of the core 4. There was a drawback that post-processing was required for removal.

The purpose of this invention is that the S structure is simple and easy to manufacture and can change the history display, and is not only low cost, but also does not generate flakes, so post-processing is not required to remove them. The objective is to provide a new mold structure that does not require

Examples of mold structures embodying this invention will be described below in Section 3.
4, a display recess 6 is formed at a predetermined position for displaying history on the molded product on the cavity surface 2 of the mold 1. The four display portions G are filled with a low melting point alloy 7 such as hazel, wood metal, etc. by melting, pouring, and cold N1. As the (I) melting point alloy 7, an alloy whose melting point is higher than the temperature during molding of the polymeric material such as rubber or synthetic resin is appropriately selected and used.

Further, on the surface of the low melting point alloy 7, numbers, marks 8, etc.
It is engraved with lff designation [3 by Chigin et al.].

According to the embodiment configured as above-), since the history display section of the mold 1 is very simple, the manufacturing of the mold is not only easy and has a low cost of 1~, but also simple and +1 Since the low melting point alloy 7 can be melted into the four display parts 6 without any gaps, the molded product will not have any flakes, and there is no need for a post-addition process to remove them.

In addition, if the surface of the low melting point alloy 7 is heated with a heating tool such as a soldering iron, and only the surface (= A history display [3] indicating the following information can be easily engraved.

In this embodiment, if the low-melting point alloy 7 has accumulated inward from the chitobitity surface 2 into the cavity when it is filled into the four display parts 6, it can be easily removed by scraping it with a 17-slip or the like. To flatten - draw.

J3, the present invention is not limited to the configuration of the above-described embodiment, and for example, an under cup 1-8 as shown in FIG. It is possible to embody it by making arbitrary changes, such as installing field screws 9 as shown in Figure V, or making it so that the low melting point alloy 7 does not easily come off from the four parts 6 shown in the figure 111: It is.

As detailed below, this invention forms a concave part on the key A/1111 side of a mold for molding polymeric materials such as rubber and synthetic resin, and forms a concave part within the concave part at a temperature higher than the melting point of the molding material during molding. By melting, pouring, and cooling a low melting point alloy with 7J] and by carving a fil history display such as a number on the surface of this low melting point alloy, 4M construction can be easily converted into flJ? !
You can also change the history display.
Not only is this effective, but since there is no formation of particles, post-processing is required to remove them (providing an excellent effect).

[Brief explanation of the drawing]

Figure 1 shows the main part I showing the layer thickness display section of a conventional mold.
qi plane view, FIG. 2 is a jF plane view of the main part, FIG. 3 is a sectional view of the main part showing an embodiment of the present invention, FIG. 4 is a front view of the nodal part of the same size Mj example, and FIG. 7 is a sectional view of essential parts showing four separate display parts of the present invention. Mold 1, cavity surface 2, four parts for display 6, low melting point alloy 7
, History display [3゜

Claims (1)

[Claims] 1. A mold for molding polymeric materials such as rubber and synthetic resins (1)
), and a low melting point alloy (A) having a melting point higher than the temperature at the time of molding of the molding material is melted in the same part (6), and then cooled. Fill and
A mold structure characterized by having a history display (B) such as a number engraved on the surface of this low melting point alloy (7). 2. The mold structure according to claim 1, wherein an undercut (8) is provided on the inner wall of the fourth part (6). 3. The mold structure according to claim 1, wherein a female thread (9) is provided on the inner wall of the recess (6).