JPS61149319A - Preparation of thermosetting resin castings - Google Patents

Abstract

PURPOSE:To prevent fillers in resin from sedimenting and to disperse them uniformly by vibrating them with an ultrasonic vibrator in the primary setting process. CONSTITUTION:Fillers are prepared, defoamed under a vacuum state, stirred and then settled. A mold 4 is mounted on the ultrasonic vibrator plate 3 of a heating oven 2. Thermosetting resin is cast calmly and promptly along the inner wall surface of the mold 4. The heating oven 2 is shut and the mold 4 is vibrated by the ultrasonic vibrator plate 3. The inner temperature of the heating oven 2 is elevated up to the primary setting temperature of the thermosetting resin and kept for a fixed time before the primary setting has been completed. The structure of the mold 4 and the thicknesses of each section are designed so that the resin comes in contact with the lower mold, the primary setting begins from the surface, goes to the middle section of the thickness, further, to the upper section and finally the total setting ends with setting of the upper casting hole. The fluid filler is not settled but suspended by ultrasonic vibration, dispersed equally, and finally set. Therefore, the castings are short of partial segregation and dispersion in physical and mechanical properties.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for producing a thermosetting resin cast product containing filler C such as a metal oxide or a metal oxide.

[Technical background of the invention and its problems]

Conventional thermosetting resin casting products are made by distributing thermosetting resin (= various fillers, casting in a vacuum state, stirring and mixing, casting into a sickle molding metal molding machine, and then heating in a continuous heating electric furnace. After the first curing process is completed, the casting mold is disassembled to take out the thermosetting resin product, and the second curing process is performed. During the primary curing process, various types of filler #14, which have a heavier specific gravity than thermosetting resin, are used.
One drawback is that the agent settles and the dispersion becomes uneven (-), and differences occur in the physical and mechanical properties of the valleys.

Boundary # (=
There are drawbacks such as differences in shrinkage rate (during primary curing) and micro-cracking.

[Purpose of the invention]

The present invention satisfies the above points, eliminates the drawbacks of the prior art, prevents the filler from settling in the thermosetting casting resin, uniformly disperses it, and eliminates local variations in physical and mechanical properties. To provide a method for manufacturing a thermosetting resin cast product that maintains its drowsy insulation performance without cracking even under environmental conditions where rapid changes in ambient temperature occur, and has long-term reliability. The purpose is to

[Summary of the invention]

In order to achieve such an object, according to the present invention, during the primary curing process of the thermosetting resin, vibration is applied to the resin in the casting mold by an ultrasonic oscillator (2), and the casting resin is vibrated by this. Pouring into the resin (= Preventing the sedimentation of the filled filler and ensuring uniform distribution of the filler in the resin.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described.

The figure is a schematic configuration diagram showing one embodiment of the present invention.

Inside the heating furnace 2 (=, the E-shaped mold 4 injected with thermosetting Shoya resin mixed with filler is placed on the ultrasonic vibrator plate 3 of the ultrasonic vibration oscillator 1 and stored. be.

After adding other fillers to the thermosetting casting resin, such as aluminum oxide or silicon carbide, to improve its mechanical properties, the thermosetting resin is thoroughly degassed under vacuum conditions. (Figure 1: After stirring, let the reef settle down sufficiently.)
= Inside the heating furnace 2 as shown 1: Place the upper part of the ultrasonic transducer plate 3 on which the upper part 4 is placed. Gently apply thermosetting resin along the inner wall surface of the metal plate 4 to prevent air bubbles from being trapped.

And quick C: Casting. Thereafter, the heating furnace 2 is sealed and the ultrasonic oscillator 11 is activated to drive the ultrasonic transducer plate 3. vibration is given.

In this state, the internal temperature of the heating furnace 2 is raised to the primary curing temperature of the thermosetting resin. Hold at curing temperature. In addition, if the cast product made of thermosetting resin is large, the filler may be precipitated during the casting process.
4 phenomena can occur together (= is not limited to the above-mentioned manufacturing method, but the ultrasonic vibration oscillator 1 is activated before the start of casting the thermosetting Shoya resin in the mold 4). Casting may be performed while driving the sonic vibrator plate 3 to apply ultrasonic vibrations of gold and 4T.

The structure of the mold 4 and the wall thickness of each part of the mold are as follows: The thermosetting Shoya resin poured into the inside of the mold contacts the metal at the bottom of the mold and primary hardening starts from the surface, and the thickness of the thermosetting Shoya resin starts from the surface. The curing progresses toward the top, and finally, the casting hole provided at the top of the mold hardens, and the entire hardening is completed.4-
The structure of the gold shop and the wall thickness of each part of Venus are designed. Therefore, by applying ultrasonic vibration, υ flow state i:b
The filler blended into the thermosetting resin is always suspended uniformly in the thermosetting resin without settling.
= It is possible to maintain the dispersed state until the final value is reached. Therefore, the filler is uniform throughout (=dispersed, there is no local segregation, there is no variation in physical and mechanical properties, and the magnetic flIA edge performance is inferior to that of other types of fillings, which have long-term reliability.) Thermosetting casting resin containing agent#
! It is possible to manufacture cast products.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to primary cure the filler in a state in which the filler is uniformly dispersed throughout the inside of the thermosetting casting resin. The cast product obtained by this method can be a cast product with no variation in 4!l!l buried and mechanical properties.

[Brief explanation of the drawing]

The figure is a schematic diagram showing an embodiment of the method for manufacturing a cast product according to the present invention.

Claims (1)

[Claims] When manufacturing a thermosetting resin cast product by blending a filler such as aluminum oxide or silicon carbide with a thermosetting resin, the thermosetting resin is cast into a mold. A method for manufacturing a thermosetting resin cast product, in which primary curing is performed by applying vibration to the mold using an ultrasonic oscillator or the like to uniformly distribute the filler during the subsequent primary curing process.