JPH09227902A - Powder forming material supply device - Google Patents

Abstract

(57) Abstract: A raw material powder is efficiently and quickly supplied, and at the same time, the structure can be simplified and downsized. SOLUTION: A raw material powder heating mechanism 32 for heating a raw material powder 14 by hot air from a hot air generating section 30 and a cavity section 24 and an upper punch 22 of a molding die 16 are heated by the hot air from the hot air generating section 30. And a mold heating mechanism 34 for. The raw material powder heating mechanism 32 includes a powder heating chamber 40, a powder introducing means 48 for introducing the raw material powder 14 into the powder heating chamber 40, a stirring means 56 for uniformly heating the raw material powder 14, and the powder heating means. A CPU 62 that detects the temperature in the chamber 40 and controls the temperature of the hot air from the hot air generating unit 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder molding material supply device for heating a raw material powder to a predetermined temperature and supplying it to a molding die.

[0002]

2. Description of the Related Art Generally, a powder molding apparatus is widely known in which a raw material powder is used as a molding material, and the raw material powder is filled in a cavity in a molding die to mold a molded body having a predetermined shape. This kind of powder molding apparatus employs a warm molding method in which the raw material powder and the molding die are molded at a predetermined temperature.

Conventionally, an electric heater, an oil heater, or the like has been used as a heating source for heating the above-mentioned raw material powder or mold.

[0004]

However, as described above, when a heater such as electricity or oil is used as the heating source, it takes a considerable time to control the heating of the raw material powder to a predetermined temperature. When troubles such as wire breakage and oil leakage occur, maintenance work becomes complicated.
Moreover, it has been pointed out that the whole equipment tends to be large and complicated, and further, the stirring mechanism and its power source are required to uniformly heat the raw material powder, and the whole equipment becomes larger and more complicated. There is.

On the other hand, the mold side is provided with a heating source separate from the heating source for the raw material powder, and in addition to the same problems as the above-mentioned raw material powder side, the die using the cemented carbide has electric and oil However, there is a problem that the heater circuit cannot be processed.

The present invention solves this kind of problem, and provides a powder molding material supply device capable of efficiently and quickly heating and supplying raw material powders and simplifying and downsizing the structure. The purpose is to provide.

[0007]

In order to solve the above-mentioned problems, in the powder molding material supply device according to the present invention, when the raw material powder is introduced into the powder heating chamber which constitutes the raw material powder heating mechanism, The raw material powder is directly heated by the hot air supplied from the hot air generating section to the powder heating chamber, and is agitated by the stirring means provided in the powder heating chamber.
Thereby, the raw material powder introduced into the powder heating chamber is uniformly heated to a predetermined temperature in a short time.

On the other hand, in the forming die heating mechanism, the cavity portion of the forming die and the forming punch are directly heated by the hot air, and the raw material powder uniformly heated to a predetermined temperature in the powder heating chamber is transferred to the heated cavity portion. It is supplied and warm forming is performed.

Therefore, the raw material powder can be rapidly and efficiently heated and supplied to the cavity portion. In addition, complicated maintenance work is unnecessary, and the equipment does not become large or complicated.

Further, the stirring means is provided with a stirring blade which is rotationally driven by the hot air supplied from the hot air generating section. For this reason, the drive source dedicated to the stirring means is not required, and the overall equipment can be further simplified.

Further, in a state where the forming punch is inserted in the cavity heating chamber which constitutes the forming die heating mechanism, hot air is supplied from the hot air generator to the cavity heating chamber to directly heat the punch and die. It At that time, since the temperature inside the cavity heating chamber is detected by the temperature sensor, the cavity including the forming punch, the die and the like can be reliably controlled to a desired temperature.

Moreover, the raw material powder heating mechanism and the molding die heating mechanism are moved integrally by a single driving means. Therefore, the structure of the driving means can be simplified and downsized at once.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic cross-sectional view of a powder molding material supply device 10 according to an embodiment of the present invention.
The material supply device 10 heats the raw material powder 14 filled in the hopper 12 to a predetermined temperature and supplies the raw material powder 14 to a molding die 16. The molding die 16 includes a die 20 provided with a cavity 18. A cavity portion 24 including the upper punch (forming punch) 22 is provided. Cavity 1
A lower punch 26 is arranged in the inside 8.

The material supplying device 10 includes a raw material powder heating mechanism 32 for heating the raw material powder 14 by the hot air from the hot air generating section 30, and the cavity section 24 and the upper part of the molding die 16 by the hot air from the hot air generating section 30. And a mold heating mechanism 34 for heating the punch 22. The raw material powder heating mechanism 32 and the mold heating mechanism 34 have a single housing 36 formed of a heat insulating material, and a powder heating chamber is provided via a partition wall 38 arranged in the housing 36. 40 and the cavity heating chamber 42 are formed separately.

At the upper part of the powder heating chamber 40, the hot air generator 3 is provided.
A first discharge port 44 communicating with 0, an exhaust port 46, and a powder introduction means 48 are provided, and the exhaust port 46 has a mesh filter 50 for preventing the raw material powder 14 from being discharged to the outside. Is installed. Powder introduction means 48
Is provided with a conduit 52 communicating with the hopper 12, and the shutter member 5 that can open and close the conduit 52 is provided in the conduit 52.
4 are provided.

Inside the powder heating chamber 40, a stirring means 56 for uniformly heating the raw material powder 14 is arranged. The stirring means 56 includes a stirring blade 58 that is supported by the housing 36 and is rotationally driven by the hot air supplied from the hot air generating unit 30. A first temperature sensor 60 for detecting the temperature in the powder heating chamber 40 is fixed to a side portion of the housing 36, and the first temperature sensor 60 has a temperature signal detected by the first temperature sensor 60. A CPU (control means) 62 for controlling the temperature of the hot air from the hot air generator 30 based on the above is connected.

A scraper 64 made of, for example, synthetic leather (or natural leather) is fixed to the lower portion of the housing 36. The scraper 64 has a first opening 66 that allows the powder heating chamber 40 to communicate with the cavity 18 of the die 20.
And a second opening 68 that allows the cavity heating chamber 42 to communicate with the cavity 18.

A second discharge port 70 communicating with the hot air generator 30 and an upper punch 22 are provided above the cavity heating chamber 42.
A hole 72 is provided for inserting and removing the air into and from the cavity heating chamber 42. On the side of the housing 36,
Second for detecting the temperature inside the cavity heating chamber 42
The temperature sensor 74 is fixed, and the second temperature sensor 74 is connected to the CPU 62.

A drive means for integrally moving the raw material powder heating mechanism 32 and the molding die heating mechanism 34 with respect to the molding die 16, for example, a rod 78 extending from a cylinder 76 is fixed to the housing 36. Has been done.

The operation of the material supplying apparatus 10 thus constructed will be described below.

First, as shown in FIG. 1, the second opening 68 on the side of the cavity heating chamber 42 is connected to the cavity 1 of the die 20.
After the housing 36 is positioned corresponding to the position corresponding to 8, the upper punch 22 is lowered and the upper punch 22 is inserted into the cavity heating chamber 42 through the hole 72 (see FIG. 2). In this state, hot air is blown from the hot air generating unit 30 into the powder heating chamber 40 and the cavity heating chamber 42 via the first and second discharge ports 44 and 70.

In the powder heating chamber 40, the shutter member 54 constituting the powder introducing means 48 is opened, and the hopper 1
The raw material powder 14 is introduced into the powder heating chamber 40 from a predetermined amount through the pipe line 52. Here, as shown in FIG. 1, since the hot air is discharged from the first discharge port 44 in the direction of the arrow C, the stirring blade 58 forming the stirring means 56 is rotationally driven in the direction of the arrow by the hot air. . For this reason,
The raw material powder 14 in the powder heating chamber 40 is directly and rapidly heated by hot air.

At this time, the temperature in the powder heating chamber 40 is detected by the first temperature sensor 60, and the detection signal is sent to the CPU 6
Sent to 2. As a result, the hot air generator 30 is drive-controlled and the inside of the powder heating chamber 40 is accurately maintained at a predetermined temperature.

Further, from the first discharge port 44 to the powder heating chamber 40
While hot air is discharged into the inside, the air in the powder heating chamber 40 is discharged from the exhaust port 46 to the outside through the mesh filter 50. Therefore, the internal pressure in the powder heating chamber 40 can be kept constant, and for example, the housing 36 is
It is possible to prevent the floating from above the die 20 of 6.

In the cavity heating chamber 42, the cavity 24 including the upper punch 22 and the die 20 is directly heated via the hot air discharged from the second discharge port 70. Then, the temperature inside the cavity heating chamber 42 is detected by the second temperature sensor 74, and the detection signal is sent to the CPU 62.

When the raw material powder 14, the upper punch 22 and the cavity portion 24 are heated to a predetermined temperature, the upper punch 2
2 rises and leaves the cavity heating chamber 42. Then, under the action of the cylinder 76, the housing 36 moves in the direction of the arrow A, and the first opening 66 communicating with the powder heating chamber 40 is arranged corresponding to the cavity 18 of the die 20 (FIG. 3).
reference).

At this time, the scraper 64 slides in the direction of arrow A while being in sliding contact with the die 20 of the molding die 16. Therefore, the raw material powder 14 in the powder heating chamber 40 is not discharged from the first opening 66 to the outside, and the raw material powder 1
4 can be reliably filled from the first opening 66 into the cavity 18. The driving of the hot air generator 30 is stopped during this filling.

After the raw material powder 14 is filled in the cavities 18, the casing 36 is moved in the direction of the arrow B through the cylinder 76, and the second opening 68 communicating with the cavity heating chamber 42 corresponds to the cavities 18. Placed in position. Then, as shown in FIG. 4, the upper punch 22 descends and enters the cavity 18 through the hole 72 and the second opening 68. As a result, powder molding is started via the die 20, the lower punch 26, and the upper punch 22.

During the powder forming step, in the powder heating chamber 40, the raw material powder 14 is introduced from the hopper 12 and hot air is discharged from the first discharge port 44, so that the heating and heat insulating treatment of the raw material powder 14 is performed. It continues.

When the powder molding process by the molding die 16 is completed, the upper punch 22 is lifted and separated from the cavity heating chamber 42, and then the casing 36 is moved to the molding product take-out position (see FIG. 5) via the cylinder 76. Be moved. And die 20
Is lowered and the molded product 80 is exposed on the die 20, the cylinder 76 is driven and the housing 36 is moved in the arrow A direction. As a result, the molded product 80 is pushed out by the housing 36 and taken out from the molding die 16.

In this case, in the present embodiment, the powder heating chamber 4
0 is supplied with a predetermined amount of the raw material powder 14 and hot air is discharged from the hot air generating unit 30 into the powder heating chamber 40 through the first discharge port 44. Therefore, the raw material powder 14
Is heated directly by hot air, so that it becomes possible to heat the raw material powder 14 to a predetermined temperature in a short time as compared with a conventional electric heater or oil heater.

At this time, the temperature in the powder heating chamber 40 is detected by the first temperature sensor 60, and the CP is detected based on the detection result.
By controlling the drive of the hot air generator 30 by U62, the raw material powder 14 in the powder heating chamber 40 can be accurately heated and kept at a desired temperature. Therefore, with a simple structure, the raw material powder 14 can be quickly and accurately heated and supplied to the molding die 16, and the effect of easily improving the efficiency of the entire powder molding operation can be obtained.

Further, the stirring means 56 provided in the powder heating chamber 40 is provided with a stirring blade 58 which is rotationally driven by the hot air discharged from the first discharge port 44. Therefore, it is not necessary to provide a dedicated drive source for rotationally driving the stirring blade 58, the raw material powder 14 can be uniformly heated, and the entire structure of the material supply device 10 is simplified and downsized. There are advantages.

Furthermore, by partitioning the inside of the housing 36 with a partition wall 38, the powder heating chamber 40 and the cavity heating chamber 4
2 and 2 are formed separately. Therefore, the raw material powder 14, the upper punch 22, and the cavity portion 24 can be heated and kept warm through the hot air generating portion 30, and the overall configuration of the material supply device 10 can be further simplified and downsized. Become. Further, unlike the conventional electric heaters and oil heaters, there is no disconnection of the electric circuit or oil leakage, and the maintenance work can be simplified at once.

[0035]

In the powder molding material feeding device according to the present invention, when the raw material powder is introduced into the powder heating chamber, the raw material powder is directly heated by the hot air from the hot air generating section, and the control means causes The temperature of hot air is controlled. As a result, the raw material powder can be heated to a predetermined temperature in a short time, and the stirring means allows the raw material powder to be uniformly heated. Therefore, it becomes possible to efficiently supply the raw material powder having a desired temperature to the molding die.

Moreover, since the heating is performed directly with hot air,
The maintenance work is simplified and the entire equipment is not enlarged or complicated as compared with the conventional one using an electric heater or an oil heater.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional explanatory view of a material supply device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state in which an upper punch is inserted into a cavity heating chamber which constitutes the material supply device.

FIG. 3 is an explanatory diagram when a raw material powder is supplied to a cavity from a powder heating chamber that constitutes the material supply device.

FIG. 4 is an explanatory diagram when performing molding with a molding die after the raw material powder is supplied to the cavities.

FIG. 5 is an explanatory diagram when a molded product is taken out after completion of molding by the molding die.

[Explanation of symbols]

10 ... Material supply device 12 ... Hopper 14 ... Raw powder 16 ... Mold 18 ... Cavity 20 ... Die 22 ... Upper punch 24 ... Cavity part 26 ... Lower punch 30 ... Hot air generating part 32 ... Raw powder heating mechanism 34 ... Mold heating Mechanism 36 ... Casing 40 ... Powder heating chamber 42 ... Cavity part heating chamber 44, 70 ... Discharge port 46 ... Exhaust port 48 ... Powder introduction means 50 ... Mesh filter 56 ... Stirring means 58 ... Stirring blades 60, 74 ... Temperature sensor 62 ... CPU 64 ... scraper 72 ... hole 76 ... cylinder 80 ... molded product

Claims (4)

[Claims] 1. A powder molding material supplying device for heating a raw material powder to a predetermined temperature and supplying it to a molding die, wherein a raw material powder heating mechanism for heating the raw material powder by hot air from a hot air generating section. And a forming die heating mechanism for heating the cavity portion and the forming punch of the forming die by the hot air from the hot air generating portion, the raw material powder heating mechanism communicating with the hot air generating portion and the cavity. In the powder heating chamber, a powder introducing means for introducing the raw material powder into the powder heating chamber, an agitating means for uniformly heating the raw material powder in the powder heating chamber, and a powder heating chamber in the powder heating chamber. A powder molding material supply device, comprising: a control unit that detects the temperature and controls the temperature of the hot air from the hot air generation unit. 2. The material supply apparatus according to claim 1, wherein the stirring means includes a stirring blade that is driven to rotate by the hot air supplied from the hot air generator. 3. The measuring apparatus according to claim 1, wherein the molding die heating mechanism communicates with the hot air generating section,
A powder molding material supply apparatus comprising: a cavity heating chamber in which a punch forming the cavity can be inserted / removed; and a temperature sensor for detecting a temperature in the cavity heating chamber. 4. The material supply apparatus according to claim 1, further comprising a single drive means for integrally moving the raw material powder heating mechanism and the molding die heating mechanism with respect to the molding die. A material supply device for powder molding, characterized by: