JPH02255258A - Device for supporting mold in centrifugal casting machine - Google Patents

Abstract

PURPOSE:To surely and quickly hold a mold without cooling by operating an operating lever, drawing an end plate toward crucible receiver direction and also braking a sliding shaft through a braking device. CONSTITUTION:The metal melted with a crucible is poured into the mold with centrifugal force. Then, the crucible receiver 8 is integrally arranged to a holder 5. The sliding shafts 6 are inserted into the holder 3 as slidable, and the end plate 10 is fixed to one ends of the sliding shafts 6. Springs 12 are set between the sliding shafts 6 and the holder 3, and the operating lever 14 is fitted to the holder 3. Bending links 17 are arranged between the springs and ends of the sliding shifts 6, and the sliding shafts 6 are held and fastened with the braking device. Then, the operating lever 14 is rotated toward fastening position direction, and the end plate 10 is drawn to the crucible receiver 8 direction with energized force of the springs 12. Then, the sliding shafts 6 are braked through the braking device. By this method, safety operation can be executed at the position apart from the high temp. mold.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mold support device for a centrifugal casting machine.

(Prior Technology) Conventionally, centrifugal casting involves melting dental metal in a crucible using high-frequency heating, and injecting the molten metal into a mold for a crown or the like by using the centrifugal force generated by rotating the metal. Machines are known (for example, the special public
(See Publication No. 9336).

(Problem to be Solved by the Invention) By the way, in the above-mentioned conventional technology, when the crucible is heated with a high-frequency heating coil and then the heating coil is lowered and driven to rotate, centrifugal force accompanying the rotation causes The mold and crucible are configured to move in the radial direction until the stopper collides with the guide tube, and as a result, if the heavier mold moves first and the mold leaves the crucible, the molten metal will spread around it. There is a risk of scattering. In addition, weight adjustment using a balancer stabilizes the rotational drive state in which the stopper collides with the guide tube, so when the crucible and mold are in the middle of reaching a stable rotational state, the balance will be lost and vibrations will occur. may occur.

The present invention has been made in view of the above points, and provides a mold support device for a centrifugal casting machine that can reliably hold a mold in a joining position with respect to a crucible against centrifugal force. .

(Means for Solving the Problems) The present invention provides a centrifugal casting machine in which metal in a crucible is heated and melted by high-frequency heating means and the molten metal is injected into a mold by centrifugal force. a holder provided in the holder; a sliding shaft slidably fitted into the holder and having an end plate fixed to one end; a spring disposed between the other end of the sliding shaft and the holder; It consists of a rotatably supported operating lever, a bending link disposed between the tip of the operating lever and the other end of the sliding shaft, and a braking device for gripping and tightening the sliding shaft, By rotating the operating lever in the direction of the lashing position,
The end plate is pulled in the direction of the crucible holder by the biasing force of the spring, and the sliding shaft is braked via the braking device.

(Function) First, metal to be melted is put into the crucible, and the heating coil is raised. Then, if you rotate the control lever,
The bending link pushes out the sliding shaft against the biasing force of the spring, and holds the end plate integral with the sliding shaft away from the crucible holder. Then, after placing the preheated mold between the end plate and the crucible holder, if the operating lever is rotated in the direction of the locking position opposite to the above, the end plate is pulled by the biasing force of the spring.
The mold is held between the crucible holder. At the same time, the braking device is activated to tighten the sliding shaft so that it does not slide.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

2 is a rotating shaft rotationally driven by an electric motor (not shown), and a supporting shaft 2 projecting in the diametrical direction is integrally fixed to the upper part of the rotating shaft. This support shaft 2 supports the holder 3, and as described later, transmits rotational torque to the holder 3, and also transmits the weight in the front-back direction (referred to as the left-right direction in the paper of FIG. 1, hereinafter the same). It functions as a fulcrum when adjusting balance.

The holder 3 includes a holder body 4 formed in a substantially dogleg shape when viewed from above, and a holder body 4 that is integrally provided at the left and right (meaning the up and down direction in the paper of FIG. 1; the same shall apply hereinafter) ends of the holder body 4. It is composed of saddle parts 5, 5.

The holder main body 4 has a through hole 4a formed in the center thereof in which the rotating shaft 1 is inserted in the vertical direction (meaning the vertical direction in the plane of the paper of FIG. 1; the same applies hereinafter), and
In order to place the support shaft 2 of the rotating shaft 1, a support groove 4b extending in the left-right direction is formed on the lower surface thereof.

Further, each of the saddle portions 5 has a semi-cylindrical portion 5a formed at the upper portion.
and a pair of hanging pieces 5 extending downward from the semi-cylindrical part 5a.
b, 5b, and a pair of support pieces 5c, 5c that protrude from the inner surface of the vertical pieces 5b, 5b, and are provided so as to form two parts of the cylindrical surface together with the inner surface of the semi-cylindrical part 5a. , the cross section as a whole is formed into a substantially inverted U-shape.

A sliding shaft 6 is slidably fitted into each saddle portion 5, supported by the inner surface of the semi-cylindrical portion 5a described above and a pair of support pieces 5c, and a fulcrum bracket 7.
A shaft portion 7a of No. 7 penetrates the pair of vertical pieces 5b from the outside and is rotatably supported.

Further, a crucible holder 8 is disposed in front of the holder main body 4 on which the crucible R can be placed, and the crucible holder 8 is connected to the holder 3 via connecting members 9, that is, the vertical portion constituting the saddle portion 5. It is fixed to the front part of piece 5b.

On the other hand, an end plate 10 that clamps the mold K between the crucible support 8 and the crucible support 8 is connected and fixed to the front ends of the sliding shafts 6, 6. This end plate 10 is formed with a cylindrical groove whose depth varies depending on the size of the mold.
It can be easily attached to a mold according to its dimensions, and at the same time, it prevents the mold K from coming off from the sandwiched state between the crucible receiver 8 and the end plate 10 and falling due to dimensional changes due to thermal contraction. Further, a stopper 11.11 is loosely fitted behind the sliding shafts 6, 6, and a spring 12, which is fitted into the sliding shaft 6.6, has its front end in contact with the stopper 11°II.
．． 12 is compressed between stoppers 13.13 fixed to the rear ends of the sliding shafts 6,6. Therefore, the biasing force of the spring 12.12 causes the stopper 11.11 to come into contact with the rear end of the saddle portions 5, 5, and the end plate 10 is moved into the crucible holder 8 via the sliding shaft 6.6. It is being towed in the direction of approaching.

The fulcrum bracket 7.7 also includes an operating lever 14.
The bifurcated lever shafts 14a, 14a pass through the lever shafts, and each lever shaft 14a protrudes a predetermined length and is fixed to the fulcrum bracket 7, and then a connecting bracket 15 is fixed to each tip thereof. Between this connecting bracket 15 and the above-mentioned stopper 13, there is a link 17a which can be freely bent by a connecting pin 16.

A bending link 17 consisting of 17b is pivotally connected.

Therefore, if the operating portion 14b of the operating lever 14 is grasped and rotated upward from the securing position (solid line state in FIG. 2) against the biasing force of the spring 12, the connecting bracket 15 will rotate around the fulcrum bracket 7. As a result of interlocking rotation (
2), the stopper 13, that is, each sliding shaft 6, is guided forward by the semi-cylindrical portion 5a of the saddle portion 5 and the supporting pieces 5c, 5c via the bending link 17 connected to the connecting bracket 15. The end plate 10 can be moved in a direction away from the front end of the crucible holder 8 by sliding the end plate 10 .

On the other hand, a cam plate 18 is integrally fixed to each of the inner hanging pieces 5b constituting the saddle portion 5.
A stepped portion 18b, which is slightly higher than the outer surface 18a, is formed at a diagonal position thereof, and a hole through which the shaft portion 7a of the fulcrum bracket 7 can pass is provided. As described above, the shaft portion 7a of the fulcrum bracket 7 passes through the hanging pieces 5b, 5b of the saddle portion 5 and the cam plate 18, and its tip protrudes inwardly. A movable pin 19 passes through the outer surface of the cam plate 18 in the diametrical direction. This pin 19 is arranged so as to be located at the stepped portion 18b of the cam plate 18 when the operating lever 14 is operated to the locking position.

A braking device is constituted by the vertical piece 5b of the saddle portion 5, the step portion 18b of the cam plate 18 that is integrated with the pin 19, and the pin 19.

Further, a counter shaft 20 having a male thread facing rearward is fixed to the center portion of the holder main body 4, and a counter weight 21 is screwed to the counter shaft 20 so as to be movable forward and backward. Therefore, the counterweight 21 can be moved forward and backward so that the weights of the front and rear portions of the rotary shaft 1 are balanced in a balance manner around the support shaft 2 of the rotary shaft 1.

On the other hand, the upper part of the rotating shaft 1 is provided with a male thread, and the operating knob 22 is provided with a female thread so that the operating knob 22 can be screwed onto the rotating shaft 1. Therefore, the rotating shaft 1 protrudes beyond the through hole 4a of the holder main body 4, and its supporting shaft 2
When the support groove 4b of the holder main body 4 is placed on the support groove 4b of the holder main body 4 and the front and rear weights are balanced by the counterweight 21, the operation knob 22 is screwed onto the rotation shaft l and tightened onto the upper surface of the holder main body 4, as shown in FIG. Both can be fixed together as shown in .

Next, the operation of the present invention will be described. First, the crucible R is placed on the crucible holder 8, then metal to be melted is put into the crucible R, and a heating coil (not shown) is raised. When the operating lever 14 is rotated upward from the locking position, the sliding shaft 6°6 is guided and supported by the saddle portions 5, 5 of the holder 3 via the bending link 17 against the biasing force of the spring 12. and slides forward, moving the end plate 10 in a direction away from the crucible holder 8. After holding the end plates 10 apart in this way, the
A mold K heated to 00 degrees is placed between the cylindrical groove formed in the end plate 10 and the crucible holder 8.

Thereafter, when the operating lever 14 is released, the end plate 10 moves rearward due to the biasing force of the spring 12 and inserts the mold K into the crucible support 8. Next, the operation lever 14
When the connecting bracket 15 is rotated in the direction of the securing position opposite to that described above, the connecting bracket 15 is rotated counterclockwise about the fulcrum bracket 7, and the bending link I7 follows the biasing force of the spring 12.

At this time, even if a force to move the sliding shaft 6 forward is applied, the bending link 17 bends to cope with the force, and the operating lever 14 is not rotated from the locked position. At the same time, control lever 1
The pin 19 integrated with the fulcrum bracket 7 connected to the cam plate 18 also rotates and rides on the stepped portion 181j of the cam plate 18. As a result, the cam plate 18 moves toward the saddle portion 5 by the height of the stepped portion 18b.
hanging piece 5b.

5b is pressed outward to reduce the distance between them, and the sliding shafts 6, 6 are firmly grasped and tightened by the support piece 5C and the semi-cylindrical portion 5a so that they do not slide.

Next, after moving the balance weight 21 in the front-rear direction to balance the weight in the front-rear direction around the support shaft 2, the operation knob 22 is tightened to integrate the operation shaft 1 and the holder 3, and a starting operation (not shown) is performed. When the switch is operated, the heating coil is energized and the crucible R is heated. and,
When the desired temperature is reached, the heating coil is lowered and an electric motor (not shown) is driven, so that rotation around the holder 3 is started. Due to the centrifugal force generated with this rotation, the molten metal in the crucible R is injected into the mold, completing the casting. At this time, although centrifugal force acts on the end plate 10 to cause it to jump outward, since the sliding shaft 6 is firmly grasped and tightened by the braking device, the sliding shaft 6, that is, the end plate 10 It never moves. After being rotated for a predetermined period of time, the electric motor stops rotating and the work is completed.

(Effects of the Invention) As described above, according to the present invention, the movement of the sliding shaft, that is, the end plate is fixed only by rotating the operating lever, and the mold can be reliably held against centrifugal force. The mold can be held quickly without cooling. In this case, the operating lever can be rotated easily with a small amount of force due to the length of the arm, and at the same time, it is possible to work safely at a position away from the hot mold.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the mold support device for a centrifugal casting machine according to the present invention, and FIG. 1 is a plan view thereof, FIG. 2 is a side view with some parts omitted, and FIG. 3 is a perspective view of the main parts. Figure 4 is the first
It is a sectional view taken along the line IV-IV in the figure. ... Holder ... Fulcrum bracket ... End plate ... Operation lever ... Cam plate ... Counter weight 6 ... Sliding shaft 8 ... Crucible support 12 ... Spring 17 ...・Refraction link

Claims (1)

[Scope of Claims] 1) A centrifugal casting machine in which metal in a crucible is heated and melted by high-frequency heating means and the molten metal is injected into a mold by centrifugal force, including a holder integrally provided with a crucible holder; , a sliding shaft slidably fitted into the holder and having an end plate fixed to one end; a spring disposed between the other end of the sliding shaft and the holder; and a spring rotatably fitted to the holder. The control lever is comprised of a supported operating lever, a bending link disposed between the tip of the operating lever and the other end of the sliding shaft, and a braking device that grips and tightens the sliding shaft to secure the operating lever. A centrifugal casting machine characterized in that when the end plate is rotated in the position direction, the end plate is pulled in the crucible receiving direction by the biasing force of the spring, and the sliding shaft is braked via the braking device. Mold support device. 2) The mold support device for a centrifugal casting machine according to claim 1, wherein the end plate is formed with a groove capable of holding the mold. 3) The braking device consists of a cam plate that is integrally fixed to the holder and has a stepped portion, and a rotating pin that is connected to the rotating shaft of the operating lever. The mold support device for a centrifugal casting machine according to claim 1, which engages with the stepped portion to grip and tighten the sliding shaft.