JPS61120631A - Method and apparatus for supplying powdery stock material - Google Patents

Abstract

PURPOSE:To uniformly fill a cavity with a powdery stock material, by setting the dimension of a powder measure, which receives advance and retraction control along the surface of a mold frame above a cavity, in the advance and retraction direction thereof to about 50% or less of the dimension of the aforementioned cavity between the front and rear ends thereof. CONSTITUTION:The dimension A1 of the emitting port 7 of a powder measure 5 in the advance and retraction direction thereof is set to about 50% or less of the dimension B1 of a cavity 3 corresponding to said measure 5 between the front and rear ends thereof. In the rising state of an upper mold 4, a predetermined amount of a powdery stock material M is charged in the powder measure 5 present at a stock material replenishment apparatus 6 and the powder measure 5 is then operated to be allowed to advance above the cavity 3 to fall and supply the powdery stock material M in the powder measure 5 in the cavity 3. At the point of time when the measure 5 reached the other end part of the cavity 3, the powder measure 5 is operated to be retracted and returned and, at the time of the return operation thereof, the powder measure 5 is allowed to correspond to the place, where the filling density of the powdery stock material M is low, at the central part of the cavity 3 and reciprocally operated appropriate times over a predetermined width.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for supplying powder raw material that uniformly fills the powder raw material into a cavity in compression molding of tiles etc. with thin walls and large areas. be.

Conventionally, in compression molding of tiles, etc., the filling of powder raw material into the cavity is as shown in FIGS. 6 to 8.
A powder bowl C that is controlled to move forward and backward along the surface of the formwork above the cavity a is provided, and after a predetermined amount of powder raw material M is introduced into the powder bowl C, the powder bowl C is moved into the cavity a. By moving upward and backward, the powder raw material M in the powder container C is allowed to drop and fill into the cavity a.

Generally, the dimensions of the powder cell C in the advancing and retreating directions approximately correspond to the front and rear dimensions of the cavity a, so the powder cell C
As the powder raw material M filled in the cavity a moves forward, the contact surface with the powder raw material M remaining in the powder bowl C covers the entire range of the cavity a, and especially in the cavity a, the powder material M is filled in the cavity a first. The part filled with raw material M receives a lot of compression due to the weight of the raw material M remaining in the powder bowl C, so its packing density is higher than other parts, and when the flour bowl C moves backward. In this case, since the remaining powder raw material M scrapes back the surface of the filled powder raw material M, the variation in the packing density becomes even more noticeable, which causes deviations in the dimensions of the product after firing.

Therefore, improvement measures have been taken, such as arranging multiple partition plates within the flour chamber C to create multiple separate chambers in the forward and backward movement directions, and applying vibration to the flour chamber C. For example, we cannot expect much effect against tiles such as 5 seagulls x 300 fins x 600mm.
In particular, in the center of the cavity a, the packing density becomes lower than at both ends due to scraping back by the powder raw material M remaining in the powder bowl C, and as the product becomes larger, the powder bowl C
It also had drawbacks such as the large size, which made it difficult to secure enough space for the costume C to move.

In view of such drawbacks, the present invention makes the dimensions of the powder container in the advancing and retreating directions corresponding to the longitudinal dimensions of the cavity approximately 50% or less of the longitudinal dimensions of the cavity, and after filling the powder raw material into the powder first. , the powder bowl is moved forward to the upper part of the cavity until it reaches the end, and then the powder bowl is moved back and forth from the end of the cavity to a predetermined width in the center of the cavity and reciprocated an appropriate number of times, and then An embodiment of the present invention will be described below with reference to the drawings, with the aim of solving the above-mentioned drawbacks by providing a method and device for supplying powder raw materials that allow the powder raw material to be returned to its original position. This is the lower die of a press machine for compression molding products such as tiles, and a formwork 2 that is controlled to rise and fall relative to the lower die 1 is disposed around the outer periphery of the lower die l. The upper space of the enclosed lower mold l is defined as a cavity 3 into which the powder raw material M is supplied, and the cavity 3. An upper mold 4 is disposed at a position facing above the mold 4, which is controlled to move up and down by a drive source such as hydraulic pressure, and pressurizes the powder raw material M in the cavity 3.

Reference numeral 5 denotes a powder bowl for supplying the powder raw material M into the cavity 3, and the powder bowl 5 is placed on the formwork 2 so as to be horizontally slidable in a predetermined direction, and the powder material M is fed into the cavity 3. The movement between the replenishment point 16 and the other end of the formwork 2 is controlled by a driving device such as a belt drive by a motor or a forward/backward drive by a cylinder.

In the present invention, the dimension At of the powder bowl 5 in the advancing and retreating direction at the discharge lower is set to about 50% or less of the corresponding front-to-back dimension Bl of the cavity 3.

Incidentally, the dimension A in the forward and backward direction of the above-mentioned mask 5 is determined by the size and thickness of the product to be molded, the fluidity of the powder raw material M, etc., and as a result of experiments, it is medium-sized, about 100 mm to 600 mm, 11 mm, etc. It has been confirmed that for large tile products, it is effective to uniformly fill the powder raw material M when it is set to about 50% or less of the front-to-back dimension B1 of the cavity 3.

Next, the method for supplying powder raw material according to the present invention will be explained. After a predetermined amount of powder raw material M is put into the powder bowl 5 located at the raw material replenishing position 6 while the upper die 4 is in the raised state, the drive device First, the powder 5 is moved forward to the upper part of the cavity 3 to cause the powder raw material M in the powder bowl 5 to fall and be supplied into the cavity 3, and when it reaches the other end of the mold 2, the powder 5 is moved back and returned. At the same time, during the return operation, the powder chamber 5 is moved back and forth an appropriate number of times over a predetermined width, corresponding to the part of the center of the cavity 3 where the packing density of the powder raw material M is low, and then the powder bowl 5 is By returning to the replenishment position 6, the operation of supplying the powder raw material M into the cavity 3 is completed, and then by lowering the upper die 4, the powder raw material M in the cavity 3 is compressed and molded.

Next, the operation of the powder raw material supply method and apparatus according to the present invention will be explained based on an example of experimental data.

[Dimensions of the outlet of the powder mass]

(Front and rear dimensions AI) 48.5 m (T to left and right dimensions) 630 m [Confirmation of filling situation in cavity] The filling situation in cavity 3 was confirmed by observing the state after pressurization with pressure paper.

1. The clay powder mass 5 was moved one way to the other end of the formwork 2. (3rd
Fig.) The filling state of the powder raw material M is better than that of the conventional powder container, but the filling amount is large near the boundary between the mold 2 and the front and back of the cavity 3, and is small in the center.

″　　　　1 The flour bowl 5 was moved back and forth between it and the other end of the formwork 2.

(Figure 4) The filling state of the powder raw material M was averaged compared to Experiment 1, but
The amount of filling in the center is still insufficient After moving the flour mass 5 to the other end of the formwork 2, it was caused to reciprocate in the center during the process of retreating. (Figure 5) It was confirmed that the lack of filling amount was adjusted by the reciprocating movement in the center.

In short, in the present invention, the dimension ^1 in the advance/retreat direction of the powder bowl 5 corresponding to the front-to-back dimension of the cavity 3 is made to be approximately 50% or less of the front-to-back dimension B of the cavity 3, and the powder raw material is stored in the powder bowl 5. After filling M, put the flour mass 5 into the cavity 3.
While moving forward upwards to reach the end, and then moving backward from the end of the cavity 3, the powder bowl 5 is extended to a predetermined width in the center of the cavity 3 and reciprocated an appropriate number of times. Since the movement is made to return to the position, the dimension A in the advance/retreat direction is reduced with respect to the central part where the packing density decreases because the powder raw material M remaining in the powder bowl 5 is scraped off by the scratching action as the powder bowl 5 moves. By reciprocating the small and narrow powder bowl 5 of Since the powder raw material M is supplied from the narrow powder bowl 5, the powder raw material M remaining in the cavity 3 is filled with the powder raw material M in the cavity 3 first. This prevents the mold from being excessively compressed due to its own weight and becoming denser than other parts, making it possible to uniformly fill the powder raw material M into the cavity 3, especially for large and thin products. be.

In addition, in the powder raw material supply device, the dimensions in the advancing and retreating directions of the powder bowl 5 that is controlled to advance and retreat above the cavity 3 along the surface of the formwork 2 are made to be approximately 50% or less of the longitudinal dimensions of the cavity 3. Therefore, the powder raw material M is placed in the cavity 3 as described above.
In addition to being able to fill the flour bowl 5 uniformly, the interior of the flour bowl 5 can be made smaller and lighter than conventional ones, and the movement space of the flour bowl 5 can be reduced, and the driving device for the flour bowl 5 can be can be controlled by a simple mechanism driven by a motor or the like, and even for a multi-cavity mold, by controlling the reciprocating movement of the powder bowl 5 for any cavity 3, the filling state can be controlled arbitrarily. Its practical effects are enormous, such as being able to make adjustments.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a sectional view of a powder raw material supply device according to the present invention, Fig. 2 is a plan view of the same, and Figs. A cross-sectional view showing the state of a raw material supply experiment, and FIGS. 6 to 8 are cross-sectional views showing a conventional example. 2 formwork 3 cavities 5 powder squares or more Fig. 1 Fig. 3 Fig. 2 Fig. 5 et al. Fig. 6 Fig. 7 Fig. 8

Claims (2)

[Claims] (1) The dimensions of the powder cell in the forward and backward directions corresponding to the front and rear dimensions of the cavity are approximately 50% or less of the front and rear dimensions of the cavity, and after filling the powder material into the powder cell, the powder cell is inserted into the cavity. While moving forward upwards to reach the end, and then moving back and forth from the end of the cavity, the powder bowl is moved back and forth an appropriate number of times across a predetermined width in the center of the cavity, and then returned to its original position. A method for supplying powder raw materials characterized by causing a return operation. (2) A powder raw material supply device characterized in that the dimension in the advancing and retreating direction of the powder cell, which is controlled to advance and retreat above the cavity along the mold surface, is about 50% or less of the longitudinal dimension of the cavity.