JP2008155258A - Heating method in warm powder compacting, and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating device in warm powder compacting, by which heating device, the quality of a formed product can be improved by appropriately controlling the temperature of the powder. <P>SOLUTION: In the heating device 1 for heating and keeping powder 6 warm, which powder material is supplied to a warm powder compacting die 10, various kinds of heating means are arranged in a carrying passage composed of a hopper 2, a supply hose 3, a supply port 4, and a feeder box 5 for supplying powder 6 to a forming die 10, and the powder 6 is gradually heated up to a temperature suitable for warm powder compacting by means of these heating means while carrying the powder 6. The heating means in the hopper 2 is a thermocouple built-in type cartridge heater or a rubber heater. The heating means in the supply hose 3 is a band heater. The heating device in the supply port 4 is a band heater or a rubber heater. The heating means in the feeder box 5 is a cartridge heater. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a heating method and apparatus for heating and keeping a powder in warm powder molding.

    As a powder heating device in warm powder molding, the container in which the powder is stored is heated until it reaches a high temperature, and then the powder is transported from the container to a molding die to a temperature suitable for warm molding. Is known (see, for example, Patent Document 1).

JP 2001-234204 A

  However, in the conventional heating device, since it is necessary to make the powder at an appropriate temperature or higher during heating, much energy is required. In addition, there is a problem that the powder temperature is lowered while the powder is conveyed from the container to the molding die.

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to perform warm molding that can improve the quality of molded products by appropriately controlling the temperature of the powder. It is intended to provide a heating method and an apparatus therefor.

  In order to solve the above-mentioned problems, the invention according to claim 1 is a heating method for heating and keeping the temperature of powder supplied to a warm powder molding die, and the powder is conveyed from the powder inlet to the molding die. In the meantime, the temperature is gradually raised to a temperature suitable for warm forming while conveying the powder.

  The invention according to claim 2 is a heating device for heating and keeping the temperature of the powder supplied to the warm powder molding die, and various heating is applied to the conveying means for conveying the powder from the powder inlet to the molding die. Means are arranged, and the temperature is gradually raised to a temperature suitable for warm forming while conveying the powder by these heating means.

  According to a third aspect of the present invention, in the warm forming heating apparatus according to the second aspect, the conveying means includes a conveying path including a hopper, a supply hose, a supply port, and a feeder box, and the heating means in the hopper is a thermocouple. The built-in cartridge heater or rubber heater, the heating means in the supply hose is a band heater, the heating means in the supply port is a band heater or rubber heater, and the heating means in the feeder box is a cartridge heater.

  According to a fourth aspect of the present invention, there is provided the warm forming heating apparatus according to the second aspect, wherein the conveying means includes a conveying path including a hopper, a supply hose, a supply port, and a feeder box, and the set temperature of the heating means in the hopper. Is 70 ° C. ± 5 ° C., the setting temperature of the heating means in the supply hose is 70 ° C., the setting temperature of the heating means in the supply port is 70 ° C. ± 5 ° C., and the setting temperature of the heating means in the feeder box is 70 ° C. ± 5 ° C. .

  According to the first aspect of the invention, since the temperature of the powder is gradually increased so as to reach a temperature suitable for warm forming from the powder inlet to the molding die, unevenness in the powder temperature occurs. Therefore, molding with an appropriate density becomes possible, and the quality of the product can be improved. In addition, since powder is heated while being conveyed, warm forming can be performed with the same equipment as room temperature forming, reducing setup time and downtime due to temperature rise compared to conventional warm forming equipment. Can be planned.

  According to the second aspect of the present invention, the various heating means arranged in the conveying means for conveying the powder from the powder inlet to the molding die are gradually brought to a temperature suitable for warm forming while conveying the powder. Since the temperature is raised, there is no unevenness in the powder temperature, so that molding with an appropriate density is possible, and product quality can be improved. In addition, since it is heated by various heating means arranged on the conveying means while conveying the powder, warm forming can be performed with the same equipment as room temperature forming, so the setup time can be reduced compared to conventional warm forming apparatuses. It is possible to reduce downtime due to the temperature rise time.

  According to the third aspect of the invention, since each heating path is provided with a suitable heating means, the powder is smoothly heated and kept warm, and the powder temperature is not uneven. Molding becomes possible and product quality can be improved.

  According to the invention of claim 4, the temperature of the heating means arranged in each conveying path can be gradually raised to a temperature suitable for warm forming while conveying the powder. Since non-uniformity does not occur, molding with an appropriate density becomes possible and product quality can be improved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a schematic view of a heating apparatus for warm forming according to the present invention.

  As shown in FIG. 1, a warm-forming heating apparatus 1 according to the present invention includes a cartridge heater or a rubber heater (not shown) provided in a hopper 2 and a band heater (not shown) provided in a supply hose 3. ), A band heater or rubber heater (not shown) provided in the supply port 4, and a cartridge heater (not shown) provided in the feeder box 5. Each heater is controlled to a set temperature by a control unit (not shown).

  Powder (for example, iron powder) 6 stored in the hopper 2 is sent to the feeder box 5 through the supply hose 3 and the supply port 4 while descending. The heater provided in the hopper 2 has a temperature raising function and a heat retaining function. In the hopper 2, a predetermined amount of powder 6 is sent to the supply hose 3 at a predetermined interval. Since the heater provided in the supply hose 3 does not have a function of storing the powder 6 in the supply hose 3, it has only a heat retaining function. The supply hose 3 conveys the powder 6 sent out from the hopper 2 to the supply port 4.

  The heater provided in the supply port 4 has a temperature raising function and a heat retaining function. The supply port 4 stores the powder 6 sent out from the supply hose 3 and sends it out to the feeder box 5 by a predetermined amount. The heater provided in the feeder box 5 has a temperature raising function and a heat retaining function. The feeder box 5 which can be moved forward and backward by the cylinder 7 stores the powder 6 sent out from the supply port 4 and constitutes a warm forming apparatus by only one powder 6 heated by moving forward. Supply to the molding die 10. The molding die 10 includes an upper punch 11, a lower punch 12, and a die 13. Reference numeral 14 denotes a band heater attached to the outer periphery of the upper punch 11, and reference numeral 15 denotes a cartridge heater attached to the outer periphery of the lower punch 12.

  The operation of the warm forming heating device 1 according to the present invention configured as described above and the warm forming heating method according to the present invention will be described. The powder 6 stored in the hopper 2 is heated by a heater provided in the hopper 2 having a set temperature of 70 ° C. ± 5 ° C. Then, the powder 6 is heated to 44.5 ° C. by actual measurement. And the powder 6 heated up to 44.5 degreeC is sent out to the supply hose 3 only by predetermined amount.

  Next, the powder 6 sent out from the hopper 2 to the supply hose 3 is kept warm by a heater provided in the supply hose 3 having a set temperature of 70 ° C. and conveyed to the supply port 4. The powder 6 conveyed to the supply port 4 is stored in the supply port 4 and heated by a heater provided in the supply port 4 having a set temperature of 70 ° C. ± 5 ° C. Then, the powder 6 is heated to 50 ° C. by actual measurement. And the powder 6 heated up to 50 degreeC is sent out to the feeder box 5 only by predetermined amount.

  Next, the powder 6 delivered to the feeder box 5 is stored in the feeder box 5 and heated by a heater provided in the feeder box 5 having a set temperature of 70 ° C. ± 5 ° C. Then, the powder 6 is heated to 51 ° C. by actual measurement. Then, from the feeder box 5 advanced by the cylinder 7, one powder 6 having a temperature of 51 ° C. is supplied to the molding die 10. In the molding die 10 to which the powder 6 at 51 ° C. is supplied, a product having an appropriate density is molded by warm molding.

  As described above, the various types of heaters arranged in the hopper 2, the supply hose 3, the supply port 4, and the feeder box 5 that convey the powder 6 from the hopper 2 to the molding die 10 are suitable for warm molding while conveying the powder 6. The temperature is gradually raised until the temperature reaches 4 ° C. (44.5 ° C. → 50 ° C. → 51 ° C.), so that there is no unevenness in the powder temperature, so that molding with an appropriate density becomes possible and product quality can be improved.

  In addition, the powder 6 is not heated only by the hopper 2 but is heated while being transported by arranging heaters in the hopper 2, the supply hose 3, the supply port 4 and the feeder box 5 that constitute the conveyance path. 2 can be miniaturized. Furthermore, since the powder 6 is heated while being conveyed, warm forming can be performed with the same equipment as room temperature forming, so the setup time is reduced and the downtime is reduced due to the temperature rise time compared to conventional warm forming equipment. Can be achieved.

  Since unevenness in the powder temperature does not occur, molding with an appropriate density becomes possible, product quality can be improved, and warm molding can be carried out with the same equipment as room temperature molding, so the use is expected to expand.

Schematic diagram of warm forming heating device according to the present invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Warm forming heating apparatus, 2 ... Hopper (powder inlet), 3 ... Supply hose, 4 ... Supply port, 5 ... Feeder box, 6 ... Powder, 10 ... Mold.

Claims (4)

This is a heating method for heating and keeping the temperature of powder supplied to a warm powder molding die. During the time until the powder is conveyed from the powder inlet to the molding die, warm molding is performed while conveying the powder. A warm forming heating method characterized by gradually raising the temperature to a suitable temperature. A heating device for heating and keeping the temperature of powder supplied to a warm powder molding die, wherein various heating means are arranged in a conveying means for conveying powder from a powder inlet to the molding die, and the heating is performed. A warm forming heating apparatus characterized in that the temperature is gradually raised to a temperature suitable for warm forming while conveying powder by means. The transport means includes a transport path including a hopper, a supply hose, a supply port, and a feeder box. The heating means in the hopper is a cartridge heater or rubber heater with a built-in thermocouple. The heating means in the supply hose is a band heater. The warm forming heating device according to claim 2, wherein the means is a band heater or a rubber heater, and the heating means in the feeder box is a cartridge heater. The transport means includes a transport path including a hopper, a supply hose, a supply port, and a feeder box, the set temperature of the heating means in the hopper is 70 ° C. ± 5 ° C., the set temperature of the heating means in the supply hose is 70 ° C., and the supply port The heating apparatus for warm forming according to claim 2, wherein the set temperature of the heating means is 70 ° C ± 5 ° C and the set temperature of the heating means in the feeder box is 70 ° C ± 5 ° C.