JP2011173375A - Device for preheating of casting material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a resin temperature of a casting material in a resin tank to a predetermined temperature in a short time. <P>SOLUTION: A device includes: a resin tank 1 for filling a casting material 2; a plurality of heaters 3a and 3b for preheating the casting material 2; a temperature sensor 12 for measuring the resin temperature of the casting material 2; a tank placing frame consisting of a rotating frame 13, and a vibrating frame 14. The heaters 3a and 3b are operated while the temperature sensor 12 is measuring the resin temperature and the plurality of heaters 3a, 3b, and the tank placing frame rotate relatively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a preheating device for a casting material such as an epoxy resin, and more particularly to a preheating device for a casting material that preheats a resin temperature in a short time.

  Conventionally, when pouring a casting material into a casting mold, it is known to preheat the casting material to a predetermined temperature and reduce the viscosity in order to improve workability and ensure the quality of the cast product. For preheating the casting material, a band heater is wound around the outside of the resin tank where the epoxy resin main agent and curing agent are mixed. (For example, refer to Patent Document 1).

JP 2005-81560 A (Page 4, FIG. 1)

The conventional casting material preheating apparatus has the following problems.
In the case of preheating by wrapping a band heater around the outside of the resin tank, since it is heating from the outside, it takes a long time of several to several tens of hours to raise the resin temperature to a predetermined temperature, and the lead time is reduced. Casting work has been difficult for a long time.

  On the other hand, there is a method in which the resin tank is carried into a heating furnace and preheated, but in order to raise the resin temperature to a predetermined temperature, a long time is required as described above. In addition, it is necessary to secure a space for installing the heating furnace. Further, the resin temperature is different between the hot air outlet side in the heating furnace and the opposite side, and the resin temperature becomes uneven. It was easy.

  When the heating time is short or when a difference occurs in the resin temperature in the resin tank using a heating furnace, the viscosity is different and the injection amount per unit time into the casting mold becomes discontinuous. Further, the flow of the resin in the casting mold becomes non-uniform, and uniform heat curing cannot be performed, making it difficult to ensure the mechanical and electrical characteristics of the cast product.

  The present invention has been made to solve the above-described problem, and provides a casting material preheating device that facilitates casting work by uniformly raising the resin temperature in a resin tank to a predetermined temperature in a short time. With the goal.

  To achieve the above object, a casting material preheating apparatus of the present invention includes a resin tank filled with a casting material, a plurality of heaters inserted into the resin tank and preheating the casting material. A temperature sensor for measuring the resin temperature of the casting material; and a tank mounting base for mounting the resin tank, wherein the plurality of heaters and the tank mounting base rotate relative to each other. To do.

  According to the present invention, since the casting material is preheated by directly inserting a heater into the resin tank, the resin temperature can be uniformly raised to a predetermined temperature in a short time, and the casting operation is easy. It can be.

The side view which shows the structure of the preheating apparatus of the casting material which concerns on Example 1 of this invention partially partially, and shows it. The figure explaining the temperature characteristic of the preheating apparatus of the casting material which concerns on Example 1 of this invention. The perspective view which shows the resin tank part of the preheating apparatus of the casting material which concerns on Example 2 of this invention partially partially, and shows it. The side view which shows the heater of the preheating apparatus of the casting material which concerns on Example 3 of this invention. The side view which shows the heater of the preheating apparatus of the casting material which concerns on Example 4 of this invention.

  The present invention is to insert a plurality of heaters arranged in parallel to the axial direction into a resin tank filled with a casting material, and relatively rotate the heater and the resin tank to raise the resin temperature to a predetermined temperature. is there. Embodiments of the present invention will be described below with reference to the drawings.

  First, a casting material preheating apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing a part of the configuration of a casting material preheating apparatus according to a first embodiment of the present invention, and FIG. 2 is a temperature of the casting material preheating apparatus according to the first embodiment of the present invention. It is a figure explaining a characteristic.

  As shown in FIG. 1, a bottomed cylindrical resin tank 1 is filled with a casting material 2 such as a liquid epoxy resin, and a plurality of rod-shaped heaters 3a and 3b are parallel to the axial direction. Inserted from top to bottom. The heaters 3a and 3b are provided with metal tubes such as stainless steel, and are arranged in a row on the heater fixing plate 4 arranged in the diameter direction. The outer heater 3a is disposed on the outer periphery in the resin tank 1, and the inner heater 3b is disposed on the inner periphery. One end of the heater fixing rod 5 is fixed to the center of the heater fixing plate 4. The other end is led out of the resin tank 1 and is fixed to a rotating device 6 having a built-in motor for rotating the heater fixing rod 5 in a rotatable manner.

  The rotating device 6 is fixed to a vertically movable device 8 constituted by a hydraulic lifter or the like that moves the heater fixing rod 5 movably in the vertical direction by a support plate 7. The vertically movable device 8 is attached to the fixed base 9.

  A first temperature sensor 10 that measures its own temperature is attached to the heater 3a. A support plate 11 is fixed in the casting material 2 in the middle part of the heater fixing rod 5 and a second temperature sensor 12 for measuring the resin temperature is attached. The height of the second temperature sensor 12 can be adjusted by the filling amount of the casting material 2.

  The resin tank 1 is placed on a rotatable rotating pedestal 13 having a built-in motor or the like, and the rotating pedestal 13 is placed on and connected to a vibrating gantry 14 that generates fine vibrations in the vertical direction. Operation control of the rotating device 6, the vertically movable device 8, the rotating gantry 13, and the vibration gantry 14 is performed by a control device 15 attached to the fixed gantry 9. Further, temperature control by the first temperature sensor 10 and the second temperature sensor 12 and operation control of the heaters 3 a and 3 b are also performed by the control device 15. Note that a lid 16 is attached to the resin tank 1 for dust prevention and heat insulation, if necessary.

  Next, a method for preheating the casting material 2 will be described. First, the casting material 2 is filled into the resin tank 1, and the up and down movable device 8 is operated to insert the heaters 3 a and 3 b and the temperature sensors 10 and 12 into the casting material 2. Next, the rotating device 6 is rotated at, for example, 50 rpm while the control device 15 operates and controls the heaters 3a and 3b.

  For example, when the resin temperature is set to 70 ° C., ON / OFF control of 68 ° C. and 72 ° C. is performed while controlling the temperature of the heaters 3 a and 3 b with a signal from the first temperature sensor 10. Then, the resin temperature measured by the second temperature sensor 12 has a temperature-time characteristic as shown by a solid line in FIG. That is, the resin temperature is linked to the temperature of the heaters 3a and 3b, rises slightly from 70 ° C. when turned on, and reaches 70 ° C. when turned off. With a resin amount of about 30 liters, the predetermined temperature of 70 ° C. can be obtained in a time t1 of several tens of minutes.

  This extends from the upper surface to the bottom surface of the casting material 2 and rotates the plurality of heaters 3a and 3b located on the outer periphery and the inner periphery in the resin tank 1, so that the entire inner and outer periphery of the casting material 2 is This is because they are heated at the same time. In general, the casting material 2 is stored at room temperature, and is preheated to a predetermined temperature immediately before casting, but can be brought to the predetermined temperature in a short time and lead time can be shortened.

  In a conventional method in which a heater is wound around the outside of the resin tank 1, as shown by a one-dot chain line in FIG. 2, the temperature reaches a predetermined temperature of 70 ° C. in a time t2 of several hours. The greater the amount of resin, the greater the difference between times t1 and t2. If the first temperature sensor 10 and the second temperature sensor 12 are plural, fine temperature control can be performed.

  Here, heating can also be performed in a short time by fixing the heaters 3a and 3b and rotating the rotary mount 13. That is, by relatively rotating the heaters 3a and 3b and the resin tank 1, the time t1 for the resin temperature to reach a predetermined temperature can be shortened. When the resin temperature reaches a predetermined temperature, the rotation is stopped, and when the temperature is lowered, the rotation is restarted, whereby the resin temperature can be kept constant within a predetermined range.

  Furthermore, by operating the vibration device 14, the filler settled on the bottom surface of the resin tank 1 can be moved in the top surface direction, and the casting material 2 can be mixed more uniformly. If the vibration device 14 is operated immediately before the resin temperature rises to a predetermined temperature, the mixing efficiency can be improved. The rotating gantry 13 and the vibration gantry 14 are referred to as a tank mounting gantry.

  Here, the casting material 2 to be preheated in the resin tank 1 may be a mixture of an epoxy resin main component and a curing agent immediately before being poured into the casting mold, or may be a main component or a curing agent alone. Good. The single main agent and curing agent are mixed immediately before injection.

  According to the casting material preheating device of the first embodiment, since the plurality of heaters 3a and 3b arranged in a row in the diameter direction are rotated in the resin tank 1, the entire inner and outer circumferences of the casting material 2 are rotated. Are simultaneously heated, the resin temperature can be raised to a predetermined temperature in a short time, and the casting operation can be facilitated. In addition, the casting material 2 preheated in this manner makes the viscosity uniform and improves the mechanical and electrical characteristics of the cast product.

  Next, a casting material preheating apparatus according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a perspective view showing a part of the resin tank part of the casting material preheating apparatus according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in the arrangement of the heater. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, the heater fixing plates 17a and 17b are arranged in a cross shape, and the heater fixing rod 5 is fixed at the center of the intersection. The heater 3a is fixed to both ends of one heater fixing plate 17a. On the other heater fixing plate 17b, the heater 3b is fixed at the intermediate portion.

  The heater fixing plates 17a and 17b are not limited to a cross shape, but may be a radial shape including a plurality of heaters centered on the heater fixing rod 5. Good.

  According to the casting material preheating device of the second embodiment, in addition to the same effects as in the first embodiment, the heating efficiency by the heaters 3a and 3b is improved, and the casting material 2 is brought to a predetermined temperature in a shorter time. be able to.

  Next, a casting material preheating apparatus according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 4 is a side view showing a heater of a casting material preheating apparatus according to Embodiment 3 of the present invention. The third embodiment differs from the second embodiment in the shape of the heater. In FIG. 4, the same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Moreover, it demonstrates using one heater fixing plate.

  As shown in FIG. 4, U-shaped heaters 18a are fixed to both ends of the heater fixing plate 17a.

  According to the casting material preheating device of the third embodiment, in addition to the same effects as in the second embodiment, the surface area of the heater 18a is increased, and the casting material 2 can be brought to a predetermined temperature in a shorter time. .

  Next, a casting material preheating apparatus according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 5 is a side view showing a heater of a casting material preheating apparatus according to Embodiment 4 of the present invention. The fourth embodiment is different from the third embodiment in the shape of the heater. In FIG. 5, the same components as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, a spiral heater 19a is fixed to both ends of the heater fixing plate 17a.

  According to the casting material preheating apparatus of the fourth embodiment, the same effects as those of the third embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Resin tank 2 Casting material 3a, 3b, 18a, 19a Heater 4, 17a, 17b Heater fixing plate 5 Heater fixing rod 6 Rotating device 7 Support plate 8 Vertical movable device 9 Fixed stand 10 First temperature sensor 11 Support plate 12 Second temperature sensor 13 Rotating mount 14 Exciting mount 15 Control device 16 Lid

Claims (6)

A resin tank filled with casting material;
A plurality of heaters for inserting into the resin tank and preheating the casting material;
A temperature sensor for measuring the resin temperature of the casting material;
A tank mounting base for mounting the resin tank;
The casting material preheating apparatus, wherein the plurality of heaters and the tank mounting base rotate relative to each other.   2. The casting material preheating apparatus according to claim 1, wherein the plurality of heaters are arranged in a row in a diameter direction of the resin tank.   2. The casting material preheating apparatus according to claim 1, wherein the plurality of heaters are arranged radially, and the radial positions of the heaters are different from each other.   The casting material preheating device according to any one of claims 1 to 3, wherein a vibration device is provided on the tank mounting base.   The casting material preheating apparatus according to any one of claims 1 to 4, wherein the plurality of heaters are U-shaped.   5. The casting material preheating apparatus according to claim 1, wherein the plurality of heaters are formed in a spiral shape.

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