JPS6123552A - Match plate mechanism - Google Patents

Abstract

PURPOSE:To provide a match plate mechanism which can generate oscillation of a high frequency by connecting electrically an electric oscillator which can impress an oscillation voltage to piezoelectric elements which are integrally fastened between upper and lower pattern plates by means of a lock bolt. CONSTITUTION:Molding sand S is blown through suction ports 19, 20 into hermetically closed cope and drag flasks 17, 18. The oscillation voltage is then impressed 12 to the piezoelectric elements 2, 2 to oscillate the elements 2, 2 at 300-30,000c/s oscillation frequency, thereby oscillating the upper and lower pattern plates 3, 4, the lock bolt 11 and upper and lower patterns 7, 8 in the resonance or nearly resonance state. Compressed air is supplied 30, 31 in this state to the inside of hollow chambers 24, 25 to move the sand toward bent plugs 13, 14 and to increase the packing density thereof. Squeeze plates 26, 27 are moved upward and downward to squeeze the sand S, thereby squeezing uniformly the sand S. The injection of the compressed air is thereafter stopped and upper and lower cover members 23, 24 are moved upward and downward to move upward and downward the flasks 17, 18 contg. the hardened sand S, by which the rapping is executed and one cycle is ended.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is suitable for a compression type mold making machine that creates a mold by compressing the molding sand in the flask without applying vibration to the mold plate. Regarding the match plate mechanism.

(Conventional technology) Conventional compression mold making machines that use matte plates to make upper and lower molds cannot vibrate the matte plates to increase the density of the molding sand, which causes problems due to insufficient filling of molding sand. Various things are occurring.

(Object of the Invention) The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a match plate mechanism for a compression type mold making machine that generates high-frequency vibrations.

(Structure of the Invention) Hereinafter, the structure of the present invention will be described in detail based on drawings of embodiments. (1) is a matching plate mechanism having patterns on both the upper and lower surfaces, and the matching plate mechanism (1) includes upper and lower patterning plates stacked back to back with a plurality of piezoelectric elements (2) interposed therebetween. (3) (4) are superimposed on the surfaces of the upper and lower nuclear pattern plates (3) (4), and have concave portions (5) (
6), the head of which is located in the recess (5), and an elastic member (9) interposed between the head and the upper pattern (7); Recess (
6) Piezoelectric element (2) (2), upper and lower pattern blends (10) are screwed into place (10) and
3) The bolt (11) is used to tighten (4) and the upper and lower patterns (7) and (8) together, and the piezoelectric element (2) (2) Element (2) (
2) is electrically connected via a cord (12) to an electric oscillator (not shown) capable of applying an oscillating voltage. Then, on the surfaces of the upper and lower pattern plates (3) (4), there are a plurality of hendbrags (13) (13), (14) (14).
) are buried therein, and the upper and lower ends of the recesses (5) and (6) are respectively closed by lids (15) and (16). (17) (18) is the upper and lower pattern plate (3)
(4) The upper and lower frames are respectively aligned with the surface of
There are sand inlets (1) on the side walls of the upper and lower core frames (17) (18).
9) (20) are formed respectively. (21) is the sand inlet (19) (2) of the upper and lower frames (17) (18)
This is a blow head that blows foundry sand into the mold. (22)
(23) are upper and lower cover members that airtightly close the upper and lower end openings of the upper and lower frames (17) and (18), and are arranged to be movable up and down by a cylinder (not shown). And above-
Inside the lower cover members (22) and (23), upper and lower squeeze plates (26) and (27) each having hollow chambers (24 and 25) inside are provided so as to be vertically slidable. Cage, nuclear upper/lower squeeze plate (26) (27)
are attached to the ends of the piston rods of the upper and lower cylinders (28) and (29) which are fixed to the upper and lower cover members (22 and 23). Then, the upper and lower squeeze plates (2
6) The hollow chambers (24) and (25) of (27) are connected to a compressed air source (not shown) via three-way directional switching valves (30) and (31), and are connected to upper and lower squeeze plates (26).
(27) has a plurality of vent plugs (32) (3
2), (33) (33) through the hollow chamber (24) (
25) respectively. (35) (36)
is a sealing member embedded in the tip surface of the blow head (21).

(Operation of the Invention) Next, the operation of the device configured as described above will be explained. Upper and lower frames (17) with upper and lower end openings hermetically closed by upper and lower cover members (22) and ) (18) with the blow head (21) inside the sand blowing port (19)'
Blow in the molding sand (S) from (20). Next, an oscillating voltage is applied to the piezoelectric element (2,,) (2) to
2) Set (2) to frequency 300~3°000%0 range 1'
11 Su 6 Up° Down Pa・1 Tongue Plate (3) (4) ,
Tightening is done by vibrating at the same frequency as the natural frequency of the bolt (11), or a frequency close to this, and the upper and lower pattern plates (3) (4) are tightened.
The lower patterns (7) and (8) are made to vibrate at or near resonance, thereby reducing the coefficient of friction between the molding sand particles and between the molding sand (S) and the upper and lower pattern plates (3) and (4). is made smaller. Under this condition, operate the directional control valves (30) (31) to
), the compressed air is ejected from the hendbrugs (32) (33) and flows through the foundry sand (S) to the vent plugs (13) of the upper and lower pattern plates (3) (4). (14) respectively. As a result, the foundry sand (S) becomes vent plug (13) (1
4) The filling density is increased by being moved smoothly and being pressed. Next, the cylinder (28)
(29) is extended and squeeze plate (26) C27
) is lowered and raised to squeeze the vibrating foundry sand (S), the foundry sand (S) is squeezed almost uniformly over the entire area. After squeezing is completed, operate the directional control valves (30) (31) and remove the vent plug (32).
(33), and discharge the residual compressed air in the hollow chambers (24) and (25).Furthermore, the application of the oscillating voltage to the piezoelectric elements (2) and (2) is stopped. To tighten the upper and lower pattern plates (3) (4), upper and lower patterns (7) (8), stop the vibration of the bolt (11), and then contract the cylinder (28) (29). The upper and lower squeeze plates (26) and (27) are raised and lowered, and a cylinder (not shown) is contracted to raise and lower the upper and lower cover members (22 and 23).

Next, upper and lower frames (17) containing hardened foundry sand (S)
(18) is raised and lowered to perform die cutting, and then the empty upper and lower frames (17) and (18) are moved to the upper and lower pattern plates (
3) After aligning with (4), top and bottom frames (17)
One cycle is completed by adding the upper and lower cover members (22) and (23) to (18).

In addition, the upper, middle and lower pattern plates (3) (4) are fixed in advance to the upper and lower patterns (7) <8) respectively, and the bolts (11) are tightened between the piezoelectric element (2) and the upper and lower patterns. It is also possible to tighten only the pattern plates (3) and (4).

(Effects of the Invention) As is clear from the above description, the present invention has a piezoelectric element interposed between the L and lower pattern plates, which are placed back to back (two overlaps), and which are tightened integrally with bolts. Since the piezoelectric element is electrically connected to an electric oscillator, it is possible to vibrate the Holt etc. at the natural frequency or a frequency close to it during tightening, and therefore the foundry sand particles This provides an excellent effect of reducing the coefficient of friction between each other and between the foundry sand and the upper and lower baton plays 1, thereby making it possible to easily and accurately compress the foundry sand to a predetermined hardness.

[Brief explanation of the drawing]

The drawing is a partially cutaway sectional front view showing an embodiment of the present invention.

Claims (1)

[Claims] The upper pattern plate (3) and the lower pattern plate (4) are stacked back to back with the piezoelectric element (2) interposed between the piezoelectric element (2) and the upper and lower pattern plates (3) and (4).
are integrally tightened via a tightening bolt (11), and the piezoelectric element (2) is electrically connected to an electric oscillator capable of applying an oscillating voltage to the piezoelectric element (2). mechanism.