JPH062003A - Method and device for directly sintering powder compact - Google Patents

Abstract

PURPOSE:To simplify the process and to improve productivity and quality by directly arranging the continuously formed powder compacts on a vibrating carbon plate in a regular fashion, removing the plate and sintering the compact in a furnace. CONSTITUTION:The powder compacts (b) formed by the mechanism 1 of an automatic powder compacting machine are directly arranged in a regular fashion on a carbon plate 5 mounted on the vibrating plate 4 of a vibrating machine 3 through a chute 2. The carbon plate 5 is detachably mounted, for example, on the vibrating plate 4 through a jig 9 provided with a thumbscrew 9a. The carbon plate 5 is removed from the vibrating plate 4 and placed in a sintering furnace together with the compacts (b), and the compacts are sintered. In this case, the compacts are excellently regularly arranged by the plate 5, the damage of the compact (b) is effectively prevented, and the process is drastically simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for directly pressing and compacting a pressure-molded powder compact suitable for manufacturing a relatively small chip such as a chip for a circular saw and a spike chip for a tire. It is about.

[0002]

2. Description of the Related Art For heat resistant and abrasion resistant tools such as cutting tools,
WC with high strength and hardness as well as excellent heat resistance and abrasion resistance
-Co alloys, WC-TiC-TaC-Co alloys, etc. are used. For relatively small chips such as chips for circular saws and spike chips for tires, powder metallurgy powder (WC Powder, Co powder, or TiC powder, TaC powder, etc. are mixed at a desired ratio) and pressure-molded by an automatic powder molding machine (press machine). For example, the above-mentioned automatic powder molding machine has a powder molding mechanism 1 including a die 1a, a lower die punch 1b that moves up and down in the die 1a, and an upper die punch 1c that moves up and down as shown in FIG. Then, the powder molding mechanism 1 has a lower die punch 1b as shown in FIG.
Is lowered and a predetermined amount of raw material powder a is filled in the die 1a by an appropriate mechanism (powder filling step), and the upper die punch 1c is lowered as shown in FIG. Die 1a
As shown in FIG. 3 (C), pressure molding is performed in the mold, the upper die punch 1c and the lower die punch 1b are lifted, and the pressure-molded powder compact b is die-cut as appropriate. By means of the above means, it is sent out in the direction of the arrow (die-cutting / sending step), and the above-mentioned steps are repeated to form a structure in which a large amount of powder compacts b are continuously pressure-molded. Further, the powder compact b is received by a box or the like via a chute or the like, transferred and aligned on a carbon plate (not shown) for sintering, arranged in a sintering furnace and sintered. .

[0003]

The powder compact, which is continuously pressure-molded by the powder molding mechanism as described above, is housed in a box or the like through a carry-out chute, and further, a carbon plate for sintering. (Not shown) is transferred and aligned and sintered, so that the transfer and alignment work requires a lot of trouble and labor, and the powder compact is damaged, resulting in its productivity, quality, Yield has become an issue.

The present invention was developed to address the above-mentioned problems, and the object of the present invention is to continuously squeeze a powder compact onto a vibrating carbon plate. It is an object of the present invention to provide a method and a device for directly pressing and compacting a pressure-molded powder compact, which is arranged in a straight line, simplifies a work process, improves productivity and quality, and greatly saves labor.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a powder compact which is pressure-molded by a powder molding mechanism of an automatic powder molding machine.
Sintering furnace together with the powder compacts that are mounted on the vibrating plate of the vibration aligning machine through the discharging chute and directly aligned on the vibrating carbon plate and then removed from the vibrating plate and aligned. By arranging inside and sintering, the powder molding mechanism of the automatic powder molding machine, the discharge chute of the powder compacts connected to the powder molding mechanism, and the discharge side of the discharge chute are arranged. And a vibration-aligning machine, and a carbon plate also used for sintering that is mounted on the vibration plate of the vibration-aligning machine and is continuously connected to the tip of the discharging chute to vibrate to directly pick up and align the powder compacts. With the provision, the working process is greatly simplified, damage to the powder compact is prevented, and the productivity and quality of the powder compact are effectively improved and labor is saved.

[0006]

[Function] The powder compact continuously pressure-molded by the powder molding mechanism of the automatic powder molding machine is mounted on the vibration plate of the vibration alignment machine through the discharging chute and directly taken on the vibrating carbon plate. , The carbon plate is aligned while being moved downward due to slight vibration, and when the powder molded body is properly filled on the carbon plate, the carbon plate is removed from the diaphragm and baked together with the aligned powder molded body group. Placed in the furnace and sintered, the carbon plate smoothly takes the powder compact directly and aligns it, and also serves as sintering, greatly simplifying the process and effectively preventing damage to the powder compact As a result, excellent productivity and quality are obtained, and labor is greatly saved.

[0007]

1 and 2 show an embodiment of the present invention. In the figure, 1 is a die 1a, a lower die punch 1b and an upper die punch 1
c is a powder molding mechanism of an automatic powder molding machine, 2 is a discharge chute obliquely provided on the delivery side of the powder molded body b that is pressure-molded by the powder molding mechanism 1, and 3 is a tip end side of the discharge chute 2. The installed vibration aligner, 3a is a vibrating section of the vibration aligner,
Is a vibrating plate of the vibration aligner arranged above the vibrating springs 4a and 4b, 5 is a carbon plate also serving as a sintering, 6 is a guide frame also serving as a presser placed on the carbon plate 5, and 7 and 8 are The clip 9 is a mounting jig with a thumbscrew 9a for removably mounting the carbon plate 5 on the vibrating plate 4. The embodiment shown in FIGS. 1 and 2 uses the powder molding mechanism 1 of the automatic powder molding machine. The carbon plate 5 in which the pressure-molded powder compact b is mounted on the vibration plate 4 of the vibration aligner 3 via the discharge chute 2.
After directly picking up and aligning, the carbon plate 5 is attached to the vibration plate 4.
It is a direct take-up sintering method of a pressure-molded powder compact, which is placed in a sintering furnace and sintered together with the group of powder compacts b which are removed from and aligned.

Further, the powder molding mechanism 1 of the automatic powder molding machine 1
A unloading chute 2 for the powder compact b continuously provided in the powder crushing mechanism 1, a vibration aligner 3 arranged on the unloading side of the unloading chute 2, and a vibration plate 4 of the vibration aligner 3. Mounted directly on the front end of the carry-out chute 2 and vibrates to directly sinter the powder compact b. I'm running.

More specifically, the carry-out chute 2 has a large number of punch holes 2a at the bottom thereof as shown in FIG.
As shown in FIG. 1A, the powder compact b of the powder compacting mechanism 1
The base end portion is removably inserted into the delivery side by a suitable means and is obliquely installed, the front end side is formed as a free end, and the chute 11 and the box 12 are arranged below it. The vibrating plate 4 is preferably formed of stainless steel or the like, and the vibrating portion 3a is used.
Causes a slight vibration through the vibration springs 4a and 4b. A jig 9 for mounting a carbon plate 5 including a bolt 9a, a butterfly screw 9b, and an abutment plate 9c is attached to both sides of the diaphragm 4, and the carbon plate 5 is placed on the diaphragm 4 by the rotation of the butterfly screw 9b. Can be easily attached and detached. Further, the guide frame 6 is preferably formed of an acrylic plate or the like, and
As shown in (A) and (B), it is formed in a frame shape arranged on three sides of the carbon plate 5, and is fixed on the carbon plate 5 by the clip 7 to hold it and to guide the powder molded body b. Become. In the clip 7, the opening / closing operation portion 7a opens / closes the clip body portion 7b to detachably fix the guide frame 6 on the carbon plate 5. The clip 8 is operated by opening and closing the clip body portion 8b by the opening and closing operation portion 8a, and the chute 2 for unloading
The front end of the is fixed to the front of the carbon plate 5 in a detachable manner.

In the embodiment of the present invention, as shown in FIG. 1, the guide frame 6 is fixed on the carbon plate 5 by the clip 7, and the carbon plate 5 is mounted on the vibration plate 4 of the vibration aligner 3 by a mounting jig 9. When the vibration aligner 3 is operated with the left end of the carbon plate 5 shown in the figure fixed to the tip of the carry-out chute 2 with the clip 8, the vibrating plate 4 is vibrated by the vibrating part 3a via the vibration springs 4a and 4b. Also, the carbon plate 5 is slightly vibrated correspondingly to the powder compact b, the tip of the discharging chute 2 is also vibrated slightly, and the powder molding mechanism 1 continuously press-molds and sends out in the direction of the arrow. Each of the powder compacts b is first slightly vibrated in the discharge chute 2 so that the adhered powder is effectively separated and drops from the punch holes 2a, and is collected in the box 12 by the chute 11 and the fine powder Carbon is smoothly carried out by vibration 5 is fed on to, carbon plate 5
The upper powder compacts b are aligned while sequentially moving downward (to the right in the drawing) due to the slight vibration (see FIG. 1B), and the powder compacts b are appropriately filled on the carbon plate 5. The vibration aligner 3 is stopped, and for example, the clip 8 is removed and changed in the direction of the arrow to fit only the tip of the discharge chute 2 to temporarily stop the discharge of the powder compact b and to fix the mounting jig. Rotating the thumbscrew 9b of the tool 9 to release the carbon plate 5 and remove it from the diaphragm 4, a new carbon plate 5 and guide frame 6 are quickly mounted on the diaphragm 4 by the same means, and the vibration aligner 3 is operated. Then, the powder molded body b on the carbon plate 5
The direct alignment of is repeated.

The carbon plate 5 removed from the vibrating plate 4 of the vibration aligning machine 3 has the guide frame 6 removed by the clip 7, and a suitable sintering furnace (not shown) together with the group of powder compacts b arranged on the upper side thereof. Placed inside and easily sintered. For example, the powder compacts b arranged on the upper side of the carbon plate 5 are arranged in a plurality of stages in the sintering furnace, and the powder compacts b are heated to about 1400 ° C.
Then, the main sintering process is performed for about 1 hour to produce a cemented carbide chip for a circular saw.

[0012]

As described above, according to the present invention, the powder compact which is pressure-molded by the powder molding mechanism of the automatic powder molding machine as described above is mounted on the vibration plate of the vibration aligner through the discharging chute to vibrate the carbon plate. The carbon plate is directly taken up and is easily and smoothly aligned while being moved downward by the slight vibration. When the powder molded body b is properly filled on the carbon plate, the carbon plate is removed from the vibration plate and aligned. It is placed in a sintering furnace together with the powder compacts and is sintered, and the carbon plate has an excellent direct alignment performance of the powder compacts, which effectively prevents the powder compacts from being damaged. , The process is greatly simplified, and productivity, quality, and yield are significantly improved.
Significant labor saving has become possible.

[Brief description of drawings]

FIG. 1 is an overall side view mechanism diagram (A) showing an embodiment of the present invention and a plan view (B) of a carry-out shout and a carbon plate portion.

FIG. 2 is an enlarged perspective view of the carry-out short.

3A to 3C are side view process diagrams (A), (B), and (C) showing the powder molding process of the powder molding mechanism.

[Explanation of symbols]

 b Powder compact 1 Powder compacting mechanism (Automatic powder compactor) 2 Carry-out chute 3 Vibration aligner 4 Vibration plate 5 Carbon plate

Claims (2)

[Claims] 1. A powder compact molded by a powder molding mechanism of an automatic powder molding machine is directly mounted on a vibrating carbon plate mounted on a vibrating plate of a vibration aligning machine through a discharging chute and aligned. After that, the carbon plate is removed from the vibrating plate and placed in a sintering furnace together with the group of powder compacts aligned to be sintered, and direct compression sintering of the pressure-molded powder compact is performed. Law. 2. A powder molding mechanism of an automatic powder molding machine, and a carry-out chute for a powder molded body which is connected to the powder molding mechanism.
The vibration aligner arranged on the carry-out side of the carry-out chute and the vibration aligner mounted on the vibration plate of the same are continuously connected to the tip of the carry-out chute to vibrate and directly align the powder compacts. A direct-loading and sintering apparatus for a pressure-molded powder compact, characterized by comprising a carbon plate that also serves as a sintered body.