JPH0544093Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention belongs to the field of plastic processing of synthetic resins, and relates to a mold for molding.

[Conventional technology]

Previously, the hot plate of the mold had several cartridge heaters embedded in it, and these cartridge heaters simultaneously generated heat to form plastic.
However, recently, temperature sensors have been installed at multiple points in order to control excessive heat applied to the mold, which causes uneven molding and defective molding, and to prevent a large amount of heat from being unevenly heated to a certain part. It controls the temperature of the cartridge heater and performs quality control. Even if the temperature of the mold is controlled by such temperature control, it is not possible to achieve accurate temperature control over the details of the mold.
There were cases where molding of highly precise products did not go well.

[Problem that the invention attempts to solve]

As mentioned above, temperature control in the details of conventional molds could not be expected to be highly accurate, making it difficult to shape plastic products with high precision.This problem has been solved by highly accurate temperature control. The problem to be solved was to balance the amount of heat generated by the cartridge heater for the mold and the amount of heat consumed by the mold in advance, in order to achieve this in every detail of the mold.

[Means to try to solve problems]

In order to solve the above-mentioned problems, we created a heat-generating structure that intentionally locally heats the heat generated by a standard cartridge tweeter, and created an electric heating cart with different heat-generating containers in multiple locations. Prepare cartridge heaters, arrange the cartridge heaters horizontally and in an overlapping cross manner inside one of the molds of a pair, and create multiple cross point areas. The calorific value of the cartridge heater at each crossing point is matched to the required heat consumption of the mold, and each cartridge heater, which is intentionally locally heated, matches the temperature distribution of the heat consumption of the mold. A solution to the above problem is to form the structure in advance so as to generate a corresponding amount of heat, thereby configuring the amount of heat consumed by each crossed cross region, and to energize each heater in synchronization with the molding cycle. It was accomplished.

[Example of idea]

Each of the drawings in FIGS. 1 to 3 is a drawing of the present invention and a conventional drawing. FIG. 1 is a plan view showing one mold 1 of a pair of molds. A plurality of cartridge heaters 2n and 3n are provided inside the mold 1 in a superimposed manner. Each of the cartridge heaters 2n and 3n is designed to have a different heat capacity at its crossing portion, and the cartridge heater is manufactured in such a manner that local heating is performed intentionally as described above.
A diagram of the circuit for supplying electricity to each of the cartridge heaters 2n and 3n is omitted (the same applies hereinafter).

FIG. 2 is a side view of FIG. 1. This figure illustrates a method in which each of cartridge heaters 2n and 3n is provided inside a mold 1 in a superposed manner.

Figure 3 shows distribution points a, b...n where the temperatures are different in the temperature distribution area where each of the cartridge heaters 2n and 3n cross each other in the temperature distribution of the mold 1 in Figure 1.
FIG.

Distribution points a, b...n with different temperatures indicate the heat consumption amount matched to the heat generation capacity of the crossed portion of the cartridge heater, and the heat generation capacity and the heat consumption amount are matched in advance. Each cartridge heater is manufactured by specifying the heat generation capacity of each cross section. Therefore, each of the cartridge heaters 2n and 3n has a structure in which specific local heating is performed corresponding to the temperature distribution points of the mold 1 that are different from each other. Thermal management of the regions of distribution points a, b...n with different temperatures is achieved by matching the heat capacity and heat consumption described above in advance and specifying the heat generation capacity of each cross section to manufacture each cartridge heater. Therefore, the temperature of each cross point area is already controlled in advance. That is, since the temperature distribution points a, b...n correspond to the heat consumption in the details of the mold 1,
In the product formation cycle, the heat saturation phenomenon occurs with the passage of time, making it impossible to accurately control the temperature. Setting an excessive heat generation capacity is not logical in this invention and does not impede its practicality. Therefore, in order to maintain a stable balance between heat consumption and heat generation capacity, the energization cycle should be synchronized with the molding cycle (the energization switch for each of cartridge heaters 2n and 3n should be turned on individually). Since it is sufficient to switch in synchronization with the molding cycle, the energization circuit diagram is omitted.

[Effect of idea]

As described above, according to an embodiment of the present invention, the temperature distribution of the mold 1 is controlled in advance in a specific manner so that the heat generation capacity in the temperature range is controlled in advance by the configuration of the mold 1. In this state, distributions a, b...n are configured for each temperature of the mold 1, and it is possible to manage the temperature of the mold 1 in a well-balanced state in every detail. Compared to a temperature control method in which temperature is controlled by providing a heat-sensitive element, this method has the effect of reducing management costs and providing a stable temperature balance.

[Brief explanation of the drawing]

FIG. 1: A plan view of an embodiment of the present invention. Figure 2: A side view of Figure 1. FIG. 3: A diagram showing distribution points at different temperatures in FIG. 1. 1... Mold with built-in cartridge heaters 2n and 3n crossed, 2n and 3n... Cartridge heaters with specific local heating. a, n...
Distribution points with different temperatures.

Claims (1)

[Scope of utility model registration request] In a mold having an electric heater inside one of the molds of a pair, a plurality of cartridge heaters each having a specified local heating portion are arranged horizontally, overlapped and crossed, and the above-mentioned The cartridge heater specifies and forms a heat generating structure in advance so as to specify and obtain the amount of heat in each cross region of the local heat portion, and the heat generation in the cross region is different, and each cartridge heater is energized. This mold is characterized by being synchronized with the molding cycle.