JPS58141895A - Method and device for formation of composite layer molding - Google Patents

Abstract

PURPOSE:To obtain a desired composite molding without any partition plate, by packing powders respectively into the two die hole of dies which are split to two members sliding with each other, then mating the die holes and compression- molding the powders to one body. CONSTITUTION:A stationary die 5a and a die hole 9a provided to the die 5a, and a movable die 5b and a die hole 9b provided to the die 5b are divided at the vertical cutting plane passing the joining position of two layers, and the two divided dies 5a, 5b are made slidable in a horizontal direction along the divided plane. Powder is packed in the dies 9a, 9b which are held deviated from each other. With the holes 9a, 9b held mated after packing of the powders therein, the powder is compression-molded from top and bottom directions. The composite molding wherein the joined surfaces of the adjacent two layers are directed vertically is obtained easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a technique for manufacturing multilayer sintered mechanical parts partially made of different materials.

1 and 2 are drawings showing a rocker arm 1 of an internal combustion engine as an example of such a component.

As the cam 2 in contact with the left end pad (It)tfCIN operates, this component performs a see-saw movement using the shaft 3 passing through the hole 1C as a fulcrum, and opens and closes the valve 4 at the right end.

Therefore, the pad 1b needs to be made of a high-quality material that not only has its own wear resistance but also does not wear out the cam of the mating member.
The main body 1a can be made of a relatively low grade material with appropriate toughness.

Now, when molding such a multi-layer compact using the powder metallurgy method, the powder forming each layer V is filled into a mold and compressed so that the S* plane of the two layers is horizontal. There is a method of filling it vertically, but! 111iff
In the case of a part, it is customary to mold the shaft hole 1c in the vertical direction as shown in the figure so that the shaft hole 1c is also molded at the same time, that is, the latter filling method is used.

Figure @5 shows a typical conventional method, in which the lower punch 6
is divided into two, @a and @b, and a partition plate T is interposed between them, and depending on the type of press, if the die is fixed type, these are the champions, or if the die is floating type, the die 5. The structure is such that the lower punch 6b and the ruler of the partition plate T can move up and down independently of each other.

To briefly explain the operation of Korikin Sakai, (a) ~ (b) First, die 5. After filling the first powder into the cavity formed by the lower punch 6a and the partition plate T, the partition plate T lowers the lower punch 6b to a predetermined filling depth and fills the second powder. Filling and (e) ~ (e) partition board?
The Y lower punches @a and @b are lowered to the same level and held together, and powder is compacted between them and the upper punch 8 to obtain the required two-layer molded product.

However, the problem with this method is that it requires a special press with a triple operating mechanism on the lower punch side, but the thickness of the partition plate is not large enough to withstand the sliding between the two punches and the pressure during forming. Although it requires a certain degree of thickness in order to have rigidity, it has the disadvantage that the thickness causes an error in the amount of powder filled.

In view of the above-mentioned circumstances, the present invention provides a filling method that does not require a partition plate, and has a structure in which the die is divided into two members each having the required mold holes and slidable against each other. The gist of this method is to fill the two mold holes with a predetermined powder in a separated state, and then perform compression molding with the two mold holes aligned.

An embodiment of the present invention will be described below.

4 to 116 are drawings showing the main structure and operation of the powder compacting apparatus according to the present invention, but the main body of the press, the drive mechanism, etc. are omitted.

In the figure, die 6) has a fixed die 5a as its main body,
It consists of a disk-shaped movable die 5b with a thickness corresponding to the powder filling depth, and the movable die is provided on the upper surface of the fixed die. i!
It is slidably fitted to I and is rotatably supported by shaft SCK.

The fixed die 5a is provided with a mold hole 9a having a contour corresponding to the desired molded body 10 main body 1a, and the movable die 5b is provided with a mold hole 9b having the same contour (corresponding to the pad 16).

When forming this mold hole, the movable die 5 is attached to the fixed die 58.
b- is fixed in the electric discharge machine in the state of being folded, and the molded body 1 is
It is appropriate to use an electrode with the same contour as the one shown in FIG. As a result, a mold hole 9 having the same outline as the desired molded body 1 is formed in the fixed die 5a, but when viewed in a state where the movable die 5bt is rotated to the position shown in FIG.
The fixed die 5a has a mold hole 18, and the movable die 5b has a mold hole 9b.
was formed. Note that the lower punch 6 and the upper bunch (not shown) are both made to have the same outline as the molded body 1, and the lower punch is always in contact with the die 5a, but usually the fourth one is restricted by the movable die 5b. It stops at the height shown in Figure (b) and can only rise further when the mold hole 9a of the fixed die and the mold hole 9b of the movable die are aligned as shown in FIG.

Similarly, rigging between the upper punch and the die (the die hole S) is possible only in the state of .

Next, the operation of this device will be explained. Figure 1jM4 shows the shape S to be filled with powder, and the mold hole 9a of the fixed die.
, a powder for the main body 1a of the molded body is placed in the cavity formed by the side surface of the movable die and the lower bunch 6, and a pad is placed in the cavity formed by the mold hole gb of the movable die and the side surface and bottom surface of the recess provided in the fixed die. Fill powder for 1b from each feeder. The opening 9C provided on the fixed die is provided as necessary to ensure smooth filling of the powder when the fluidity of the powder is low or the width of the mold hole 9b is narrow, and its size and shape may vary. may be optional, and may not be necessary.

Next, when the shaft 5C is rotated in the direction of the arrow, the movable die 5b
rotates accordingly, passing through the state shown in Fig. 5 and reaching the state INK of No. 6@I, where the mold hole 9a of the fixed die and the mold hole 9 of the movable die are connected.
b match, and a mold hole 9 of a desired shape is formed. Therefore,
In this state, by lowering the upper punch (not shown) located above the mold hole 9, the desired multilayer molded body 1 is molded.

Whether to use the lower punch push-up method or the die-lower method in this powder compaction step and the discharge step after molding is a relative matter, and can be appropriately selected depending on the type of press used, etc.

In addition, when dividing the mold hole 9 of the desired shape into two parts of 98.9b, the above example (the example of dividing by curve II (circle) is shown, but this is divided by 11 curves with an infinite radius of curvature). do,
They may be slid against each other along the dividing plane, and this embodiment also falls within the scope of the present invention.

As described in detail above, according to the present invention, a single lower punch is required, and unlike the conventional method (in addition to the lower punch being divided into two parts, the partition plate also requires triple operation), the interposition of the partition plate eliminates the error in filling amount. Furthermore, it has the advantage that a desired multilayer molded product can be easily molded in two pieces rather than having to increase the number of mold holes at symmetrical positions, for example.

[Brief explanation of the drawing]

$1! Figures 1 and 2 show the appearance and usage of the mouth and arm of an internal combustion engine as an example of a multilayer molded product.
I! J#, Figure 3 is a drawing explaining a conventional apparatus for molding a multilayer molded body, all! 4 to 6 are drawings for explaining the main parts of the apparatus according to the present invention. 1.-Multilayer molded body (rocker arm> 1a...
・Body of molded body 1b...Pad 1C...
Shaft hole 5...Die 5a-fixed die 5b...movable die 5C...rotating shaft 6...lower punch 9.
... Mold hole 9a --- Body of molded body 18I11 Mold hole 9
b...Pad 1b #I type hole agent Kunihiko Masubuchi Figure 3

Claims (1)

[Scope of Claims] 1. When compacting a multi-layer compact with the joint surfaces of two adjacent layers perpendicular, Using a die that is divided at a cutting plane and configured so that both parts can slide horizontally along the dividing plane, the divided mold holes are offset from each other and filled with powder. 1. A method for forming a multilayer compact in a powder metallurgy, characterized in that the powder in the mold hole is compression molded from above and below with the mold holes aligned again. 2. In a device that compresses and molds powder filled into a mold hole provided in a die between upper and lower punches, the above-mentioned die razor is formed from several die members divided by a vertical cutting plane passing through the mold hole. 1. An apparatus for forming a multilayer compact in powder metallurgy, characterized in that both members are configured to be able to slide in one horizontal direction along the dividing plane.