JP3105989U - Powder molding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder molding apparatus capable of shortening a moving stroke of a feeder to increase a molding speed, eliminating disturbance of a boundary between a first layer powder and a second layer powder and reducing the amount of expensive material used to the utmost. To provide.
SOLUTION: An upper punch driven in a vertical direction, a die 10 into which the upper punch is inserted, a first feeder filling a first layer, and a second feeder 16 filling a second layer. A temporary pressing mechanism 15 for temporarily moving the filled first layer powder with a temporary pressing punch 14 driven in the vertical direction by a temporary pressing cylinder 13 by moving the powder from the side. I do.
[Selection diagram] Fig. 4

Description

  The present invention relates to a molding apparatus for compression-molding powder filled in a mold in powder metallurgy, and more particularly to a molding apparatus for molding two types of powder in two layers.

  In general, two-layer molding in powder metallurgy is widely used in the production of products used under conditions of extremely severe use environment, high temperature, high load, high frequency, etc., for example, valve seats for engines and the like. In other words, use expensive materials only for those parts that need to withstand high temperatures, high loads, etc., and use inexpensive materials for other parts to reduce production costs and use valuable resources effectively. It is intended.

  9 to 14 are explanatory views showing the operation of a powder molding apparatus used for conventional two-layer molding. Here, a conventional two-layer molding apparatus will be described. FIG. 9 is a cross-sectional view showing a state where a molded product is extracted. The die 1 descends, and the pressure-formed product 2 is extracted. At this time, the feeder 3 having the first layer powder storage section 3a and the second layer powder storage section 3b is retracted from the position of the die 1.

  In FIG. 10, the feeder 3 moves forward and pushes out in front of the formed product 2. At this time, the first-layer powder storage portion 3a of the feeder 3 is located directly above the die 1, but the die 1 is still lowered and the powder is not charged. In FIG. 11, the die 1 rises and the first-layer powder is filled from the first-layer powder container 3a by the suction method. The filling amount is determined by the amount of rise of the die 1.

  In FIG. 12, the feeder 3 retreats to an intermediate position between the first-layer powder storage section 3a and the second-layer powder storage section 3b, and rises by the amount that the die 1 fills the second-layer powder. In FIG. 13, the feeder 3 is further retracted to fill the second-layer powder from the second-layer powder storage 3b. In FIG. 14, after the feeder 3 is completely retracted, the upper punch 4 descends and presses and forms the first layer powder and the second layer powder together.

However, the above-mentioned powder molding apparatus has the following problems.
First, one feeder 3 has a first-layer powder storage unit 3a and a second-layer powder storage unit 3b. Since two types of powder are filled, the moving stroke of the feeder 3 is increased, and Molding took time and productivity was poor.
Further, there is a disadvantage that the shape of the molded product is limited.
Furthermore, since the powder of the second layer is directly filled on top of the powder of the first layer, the boundary between the powder of the first layer and the powder of the second layer is disturbed, and there is a possibility that the powder mixes.
Furthermore, since the boundary between the first and second layers of powder may be disturbed, the amount of expensive material used cannot be reduced below a certain value from the viewpoint of product safety.

  Therefore, the object of the present invention is to improve the conventional drawbacks mentioned above by shortening the moving stroke of the feeder, increasing the molding speed, and eliminating the disturbance of the boundary between the first powder and the second powder, thereby reducing the cost of expensive materials An object of the present invention is to provide a powder molding apparatus capable of minimizing the amount of used powder.

  In order to solve the above-mentioned problems, the present invention basically employs the following configuration. That is, as a first mode according to the present invention, an upper punch driven in the vertical direction, a die into which the upper punch is inserted, a first feeder filling the first layer, and a second layer A second feeder to be filled, and a temporary pressing mechanism for temporarily pressing the filled first layer powder by a temporary pressing punch that is moved from the side and driven vertically by a temporary pressing cylinder. It is characterized by the following.

  Further, the first feeder may be configured to be driven mechanically. Further, the second feeder may be configured to be driven mechanically.

According to the present invention, the following effects can be obtained.
The first effect is that each feeder stroke can be minimized, and the molding speed can be improved.
The reason is that the feeders are separated for the first layer and the second layer so that independent operation is possible.

The second effect is that there is no limitation on the shape of the molded product, and any shape can be used for molding.
The reason is that, after filling the first layer, the powder is temporarily pressed to solidify the powder, and then the second layer is filled.

The third effect is that the boundary between the first layer and the second layer is clear and the powder is not mixed.
The reason is that the second layer is filled after the first layer is temporarily pressed after filling.

The fourth effect is that the surface shape of the first layer can be arbitrarily changed, and an expensive material can be arranged only at a necessary place. As a result, the amount of expensive materials used can be reduced to the utmost, and cost reduction can be achieved.
The reason is that the feeders for the first layer and the second layer are separated from each other so that independent operations are possible. Further, after the first layer is filled, the powder is temporarily pressed and solidified, and then the powder of the second layer is filled.

(Example)
Hereinafter, a specific example of the powder molding apparatus according to the present invention will be described in detail.

  1 to 7 are explanatory views showing the operation of the powder molding apparatus according to one embodiment of the present invention. First, in the extraction process, as shown in FIG. 1, the die 10 descends to extract the pressure-formed product 11. At this time, the first feeder 12 containing the powder to be the first layer is retracted.

  Next, in the first layer filling process, the first feeder 12 advances to just above the die 10. The first feeder 12 is driven mechanically, for example, by a cam or the like. Thereafter, as shown in FIG. 2, the die 10 is raised, and the first layer of powder is filled from the first feeder 12 by suction. In addition, the first feeder 12 that has moved forward pushes the product 11 forward with its tip. Further, after the filling operation is completed, the first feeder 12 retreats as shown in FIG.

  Next, in the temporary pressing, as shown in FIG. 4, a temporary pressing device 15 including a temporary pressing punch 14 driven in the vertical direction by a temporary pressing cylinder 13 moves from the side. Here, the die 10 rises by the second layer. The temporary pressing device 15 that has moved moves the temporary pressing punch 14 down with the temporary pressing cylinder 13 to temporarily press the filled first layer as shown in FIG. By this temporary pressing, the powder density of the first layer is increased, and the boundary with the second layer to be filled next can be clarified. In addition, the shape of the boundary between the first layer and the second layer can be freely set. Further, a second feeder 16 is movably arranged to face the temporary pushing device 15.

  In the second layer filling process, after the provisional pressing device 15 is retracted, the second feeder 16 moves right above the die 10 as shown in FIG. Fill with powder. The second feeder 16 is driven by a mechanical type, for example, a cam or the like.

  In the pressure processing, as shown in FIG. 7, after the second feeder 16 retreats, the upper punch 17 descends, and the filled first layer powder and second layer powder are pressed and molded.

  8 (a) to 8 (f) are enlarged cross-sectional views of a principal part for explaining the operation in the powder molding apparatus of the present invention. FIG. 8A corresponds to FIG. 1 and shows a state where the die 10 is lowered and the molded product 11 is extracted.

  FIG. 8B shows a state where the first feeder advances and the die 10 is raised to fill the first layer. This corresponds to FIG. FIG. 8C shows a state in which the die 10 has moved up by the second layer and the provisional pressing device 15 has moved forward, and corresponds to FIG.

  FIG. 8D shows a state in which the temporary pressing punch 14 of the temporary pressing device 15 is lowered to temporarily press the first layer, and corresponds to FIG. FIG. 8E illustrates a state in which the second feeder 16 moves forward after the temporary pressing device 15 retreats and fills the second layer, and corresponds to FIG. 6.

In FIG. 8 (f), after the second feeder 16 retreats, the upper punch 17 descends to press and form the first and second layers of powder. This corresponds to FIG.

  It should be noted that the present invention is not limited to the above embodiment, and various design changes can be made based on the technical idea of the present invention.

FIG. 4 is an explanatory view showing the operation of the powder molding apparatus according to one embodiment of the present invention. It is operation | movement explanatory drawing at the time of the 1st layer feeder filling powder in the same powder molding apparatus. It is explanatory drawing which shows the state in which the 1st layer feeder in the same powder compacting apparatus retreated. It is explanatory drawing which shows the state in which the temporary press apparatus in the same powder compacting apparatus advanced to above the die. FIG. 3 is an explanatory diagram showing a state where a temporary pressing operation is completed in the powder molding apparatus. It is explanatory drawing which shows the case where the 2nd layer feeder advances and fills powder in the same powder molding apparatus. It is explanatory drawing which shows the case where an upper punch descends and pressurizes in the same powder compacting apparatus. (A)-(f) is a principal part expanded sectional view explaining each operation | movement in the powder molding apparatus of this invention. It is explanatory drawing which shows operation | movement of the conventional powder molding apparatus. It is explanatory drawing which shows operation | movement of the conventional powder molding apparatus. It is explanatory drawing which shows operation | movement of the conventional powder molding apparatus. It is explanatory drawing which shows operation | movement of the conventional powder molding apparatus. It is explanatory drawing which shows operation | movement of the conventional powder molding apparatus. It is explanatory drawing which shows operation | movement of the conventional powder molding apparatus.

Explanation of reference numerals

Reference Signs List 10 Die 12 First feeder 13 Temporary pressing cylinder 14 Temporary pressing punch 15 Temporary pressing device 16 Second feeder 17 Upper punch

Claims (3)

An upper punch driven in the vertical direction, a die into which the upper punch is inserted, a first feeder for filling the first layer, a second feeder for filling the second layer, A temporary pressing mechanism for temporarily pressing the first layer of powder with a temporary pressing punch driven in a vertical direction by a temporary pressing cylinder while moving the powder from the side. The powder molding apparatus according to claim 1, wherein the first feeder is driven mechanically. The powder molding apparatus according to claim 1, wherein the second feeder is driven mechanically.

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