JPH02298203A - Method and apparatus for producing green sheets from powder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is for continuously manufacturing green sheets from metal or non-metal powder, and in particular for continuously manufacturing thick green sheets. METHODS AND APPARATUS.

[Prior Art] As a conventional example of manufacturing a green sheet from metal powder, two rolls are generally arranged side by side, and metal powder is supplied to the roll gap between the two rolls.
A powder rolling machine is known in which the metal powder supplied to the roll gap is compressed and sent out by rotating both of the rolls to continuously form a green sheet (Japanese Patent Publication No. 13401/1983). ).

However, in the method of producing green sheets from metal powder using two rolls as described above, the roll gap cannot be made too large in order to prevent the metal powder from falling from between the rolls. Inevitably, it is impossible to manufacture thick green sheets. Generally, green sheets with a thickness of 2# or less can be manufactured, but green sheets with a thickness greater than that cannot be manufactured, and therefore However, it was not possible to increase the density of the green sheet because the amount of reduction in the subsequent process could not be taken. Therefore, there is a problem that the applications are limited.

In addition, as a method for manufacturing high-density green sheets from metal powder, a predetermined number of thin green sheets manufactured using rolls as described above are overlapped, and an appropriate metal powder is sandwiched between each green sheet as a binder. A method in which sintering is performed in that state, followed by sintering, back-rolling, and annealing (Japanese Unexamined Patent Publication No. 10106/1983), or a molded body made of metal powder is packed in a metal container,
The above-mentioned container is heated in the atmosphere while preventing oxidation of the molded body, and then the container and its contents are hot-processed in the atmosphere (Japanese Patent Application Laid-Open No. 50-38612), etc. is proposed.

[Problems to be Solved by the Invention] However, although both of the above-mentioned methods for manufacturing high-density green sheets produce high-density products using metal powder, it is not possible to continuously manufacture green sheets.

Therefore, the present invention aims to manufacture thick green sheets continuously and at high density, and also to manufacture green sheets from not only metal powder but also non-metal powder, or a mixture of both. .

[Means for Solving the Problems] In order to solve the above problems, the present invention supplies powder supplied between two guide rolls to a powder forming material (hereinafter referred to as powder material) from the exit side of both guide rolls. The material is transported to the entry side of the running press machine while being held in the thickness direction by a belt.
Next, the powder material is sandwiched by belts from both sides in the width direction, and with the powder material sandwiched on all sides by the belts, it is guided between the top and bottom, left and right molds of the inter-running press device, pressurized, and fed sequentially. This is a method and apparatus for continuously producing green sheets by pressurizing the powdered materials that are produced in the same way. The belt that clamps the powder material in the thickness direction and the belt that clamps it in the width direction are wound up on the exit side or the input side of the running press device, or are endless. Further, the above-mentioned belts that clamp the powder material supplied to the entry side of the inter-running press device are arranged so that the intervals are gradually narrowed from the upstream side toward the inter-running press device to increase the inflow speed of the material. It's Nishide.

[Function 1] Since the powder material is conveyed between the running presses while being held between the belts, there is no possibility that the powder will spill during this process. Therefore, the powder material supplied to the inter-running press device can be thick, and since this is pressed, thick green sheets can be manufactured at high density and continuously.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention, in which a mixed powder 1 of metal powder or non-metal powder (for example, ceramic powder) and metal powder is arranged in a pair of thicknesses in the thickness direction. It is surrounded by steel belts 2a, 2b for width and a pair of steel belts 3a, 3b arranged in the width direction, and is held in a rectangular powder material 4, and in this state, it is passed to the entry side of the running press device 5. At the same time, the powder material 4 surrounded by each pair of belts 2a, 2b and 3a, 3b is pressurized to form a high-density, thick material. Green sheets 6 are continuously produced.

Specifically, the running press device 5 includes an upper shaft box 9a that is fitted into the upper part of the window part 8 of the housing 7 so as to be slidable in the vertical direction, and is screwed into the upper part of the housing 7 by passing through the upper end part of the housing 7. The lower end of the position adjusting screw 10 is connected to the upper end surface of the upper axle box 9a, so that the upper axle box 9a can be vertically displaced via the position adjusting screw 10 by a drive device (not shown). The lower axle box 9b is fitted into the lower end of the window 8 of the housing 7 and supported.

The upper and lower axle boxes 9a and 9b respectively support rotary shafts 11a and 11b extending in the horizontal direction orthogonal to the line direction, and eccentric portions t2 formed on the rotary shafts 11a and llb.
Rods 13a and 13b of the required shapes are attached to a and 12b, respectively.
are rotatably fitted through bearings 14, and slide blocks 15a and 15b are fitted to respective tip ends of both rods 13a and 13b with bearings 16.
The respective slide blocks 15a and 15 are axially connected via
b is fitted into the window part 8 of the housing 1 so as to be slidable in the vertical direction, and when the rods 13a and 13b are moved up and down by the eccentric parts 12a and 12b when the upper and lower rotating shafts 11a and llb are rotated, the rods 13a and 13b are slid up and down. The blocks 15a and 15b can be moved up and down along the window 8 of the housing 7. Moreover, the above-mentioned upper and lower slide blocks 15a,
Upper and lower molds 17a, 17 are placed on opposite surfaces of 15b.
b are slidably engaged in parallel to the line direction, and the upper and lower molds 17a and 17b have respective piston rods 19a and 1 of fluid pressure cylinders 18a and 18b arranged parallel to the line.
9b are connected, and the fluid pressure cylinders 18a, 1
Upper and lower molds 17a are formed by 8b.

17b is designed to be able to slide along the slide blocks 15a, 15b G,:. Furthermore, the upper and lower molds 17
Side molds 20a and 20b are opposed to each other on the left and right sides of the location to be pressed by a and 17b, and can be reciprocated in the direction across the line by a rolling down device (not shown). Note that the rotating shafts 11a and I supported by the upper and lower shaft boxes 9a and 9b are
lb are each connected to a synchronous gearbox of a drive device via a universal (not shown).

Further, as a means for supplying powder to the inter-running press device 5, there is a powder rolling function that applies a compressive force between the two rolling rolls 21 and 22 to the extent that it becomes powder 1 and sends it out as powder material 4. A part 23 equipped with the above is installed on the inlet side of the running press device 5, and a pair of thickness steel belts 2a and 2b are placed above and below to sandwich the powder material 4 to be formed in the part 23 in the thickness direction. , the upper and lower molds 17 of the running press device 5 from the independent unwinding rolls 24a and 24b, respectively.
The winding wheels 25a and 25b are passed through between a and 17b.
・In addition, guide rolls 26a and 26b are arranged at required locations to maintain a predetermined distance between the pair of thickness steel belts 2a and 2b, and the powder material 4 is A pair of width steel belts 3a, 3b arranged on the left and right to hold both ends in the width direction are similarly passed through the respective unwinding rolls 27a, 27b between the left and right side molds 20a, 2Ob of the running press device 5. Guide rolls 29a, 29b are placed at required locations so as to be guided to the winding rolls 28a, 28b.
and the above pair of width steel belts 3a and 3b.
The inter-running press device 5
Inside the belts 2a, 2b, 3a, and 3b, the powder material 4 is pressed from above, below, and from the left and right so that green sheets 6 having a rectangular cross section are continuously manufactured.

Now, when trying to manufacture the green sheet 6 from powder, in the roll gap between the two rolling rolls 21 and 22, a metal powder or, in the case of a non-metal powder, a mixture of the two using the metal powder as a hardening agent is added. 1 is supplied, and the rolling rolls 21 and 22 are rotated to compress the powder 1 in the roll gap and send it out downward. Since the roll gap between the rolling rolls 21 and 22 is wide in order to obtain the thick green sheet 6, it is not possible to apply a large compressive force to the powder 1 in the thickness direction at the roll gap. Although the powdered material 4 is sent out in an unhardened state, steel belts 2a, 2b and 3a, 3b are used as guide rolls 26a in the thickness direction and width direction of the powder material 4, respectively.

26b, 29a, and 29b, so that the powder material 4 sent out from the rolling rolls 21 and 22
Thereafter, they will be conveyed while being held between steel belts 2a, 2b and 3a, 3b. Steel belts 2a, 2b for the above thickness and steel belts 3a, 3 for width
b is each winding roll 25a, 25b and 28a,
Since the powder material 4 is moved by being wound around the belts 28b, the powder material 4 held between these belts so as not to spill is sequentially fed into the inter-running press device 5. When the tip of the powder material 4 is introduced into the running press device 5,
Prior to the pressing operation by the inter-running press device 5, the powder vJ is
A steel belt 2a is used to cover the tip of the steel belt 2a.

2b, 3a, and 3b to prevent the powder from escaping to the exit side of the running press device 5 during pressing.

Next, the upper and lower molds 17a of the running press device 5.

17b1 The left and right side molds 20a, 20b are moved forward to pressurize and compress the powder material 4 inside each of the steel bells 1 to 2a, 2b for thickness and the steel belts 3a, 3b for width to form a green sheet 6. Let it form.

At this time, the powder material 4 located on the upstream side (inlet side) of the inter-running press device 5 is subjected to some compressive force at the roll gap between the rolling rolls 21 and 22, and is directed toward the inter-running press device 5. Since a pushing force is generated to the steel belts 2a, 2b, 3a, 3, the powder 1 that forms the powder material 4 is unlikely to escape to the upstream side during press molding, and the powder material 4
Pressure molding is performed via b.

After one press forming process, the steel belt 2a
, 2b, 3a, and 3b are wound into rolls 25a, 25b.
The upper and lower molds 17a, 17b and the side mold 20a are moved by sequentially winding up the upper and lower molds 17a, 17b and the side mold 20a.

The molds 17a and 17b are placed one after another between the molds 20b.
and 20a and 20b to form a plate.

The upper and lower molds 17a, 17b and the side mold 20a
, 20b, the steel belts 2a, 2b passed between them.
and 3a.

3b are peeled off from the green sheet 6 and wound around take-up rolls 25a, 25b and 28a, 28b, thereby producing a thick green sheet 6 continuously.

In addition, in the illustrated running press device 5, the upper and lower molds 17
By rotating the rotating shafts 11a and 11b, the powder materials 4a and 17b are brought closer to each other and separated from each other via the eccentric parts 12a and 12b and the rods 13a and 13b. can be rolled down simultaneously in the thickness direction. At this time, the fluid pressure cylinder 18
a and 18b push back the molds 17a and 17b in the upstream direction of the conveyance line when the molds 17a and 17b move backward, and when the molds 17a and 17b move forward and pressurize the powder material 4, the powder Steel belt 2a moving together with material 4
, 2b are moved in the downstream direction of the conveyance line, so that the thickness of the powder material 4 is continuously reduced and molded to a predetermined size.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, in order to further reduce the spillage of powder from the joining part of the thick steel belts 2a, 2b and the width steel belts 3a, 3b, As shown in Fig. 4, the joints of the steel belts 2a, 2b and 3a, 3b are pressed together so as to overlap, and after pressing, the belts 2a, 2 are removed from the green sheet.
b, 3a and 3b can be peeled off, each belt can be used in multiple layers, and the rolling roll 2
1 and 22 may be arranged diagonally and a hopper for supplying powder may be provided in the roll gap, or, for example,
The rolling rolls 21 and 22 on the entry side do not necessarily need to be provided, and may be used as guide rolls for the powder introduction belt, and the thickness and width belts 2a, 2b, 3a,
3b shows a case in which both belts are wound onto a take-up roll, but each of these belts may be endless, and furthermore, the running press device 5 shown in the figure is just an example,
It goes without saying that configurations other than those shown in the drawings may be used, and that various other changes may be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the method and apparatus for producing a green sheet from powder of the present invention, the metal powder or non-metal powder and metal powder supplied to the roll gap of a pair of guide rolls can be mixed. The mixed powder is compressed by the roll gap of the guide rolls to form a powder material, and this powder material is sandwiched between a pair of thickness belts that sandwich the powder material from the thickness direction and a pair of width belts that sandwich the powder material from the width direction. In this state, the powder material is transported to the inter-running press machine, and the powder material is pressurized from above and below, left and right, and the belt is peeled from the molded product to obtain a green sheet. ), thick green sheets can be obtained from the powder, and since it is pressurized by a press, high-density green sheets can be manufactured, and new alloy strips that cannot be manufactured with melted lumber can be manufactured, among other excellent effects. It can be played.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing one embodiment of the present invention, Fig. 2 is a schematic plan view of Fig. 1, and Fig. 3 is the relationship between the arrangement of molds in the running press machine and the powder material holding belt. An example diagram showing the 4th
The figure is a front view of another modification of FIG. 3. 1...Powder, 2a, 2b...Steel belt for thickness (belt for thickness), 3a, 3b...Steel belt for width (belt for width), 4...Powder material, 5... - Running press device, 6...Green sheet, 9a...Lower axle box, 9b...Lower axle box, 11a, llb...Rotating shaft, 17a...Upper mold, 17b... Lower mold, 20a
, 20b--Side mold, 21.22--Rolling roll, 23--Part with powder rolling function, 28a, 2
8b... Winding roll.

Claims (2)

[Claims] (1) The powder material is sandwiched in the thickness direction by a pair of thickness belts, and also in the width direction by a pair of width belts, and the upper and lower molds and left and right side molds of the running press device are held while the powder is being sandwiched. A method for manufacturing a green sheet from powder, characterized in that the green sheet is manufactured by sequentially pressurizing the powder material in between. (2) An inter-running press device comprising upper and lower molds and left and right side molds so that at least the upper and lower molds can move forward and backward in the direction of belt movement, and the upper and lower molds that hold the powder material in the thickness direction. It is characterized by consisting of a pair of thickness belts that pass between them, and a pair of width belts that pass between the left and right side molds while sandwiching the powder material in the width direction. Equipment for producing green sheets from powder.