JPH09192780A - Device for turing over sand mold for casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To turn over an outer frame for casting without needing the assist worker, to simply and safely execute the operation and to be suitably adopted at the time of taking out a wooden pattern from the outer frame for casing. SOLUTION: This device consists of a sand mold turnover tool 3 protruded with a pair of the supporting shafts 6 on the outer peripheral surface of the flat and cylindrical peripheral flask 5 opened at the both ends and at the intermediate height and in concentric state, an outer frame 12 for casting in which a turning body 7 is fitted to a tooth to this supporting shaft 6, a pair of baring parts 11 turntable a peripheral flask 5 around the center line of supporting shafts by supporting the supporting shaft to a base in the horizontal state respectively, and a turning device 4 for turning the supporting shaft 6 by engaging with the turning body 7 with the tooth of the supporting shaft 6 supported with the bearing part and turning the turning body 7 with tooth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention allows a sand-filled casting outer frame to be reliably and easily rotated without arranging an auxiliary worker for rotation, thus ensuring work safety and labor saving. The present invention relates to a sand mold reversing device for casting which can be realized.

[0002]

2. Description of the Related Art A vehicle made of rubber is used for a vehicle traveling on a road surface, and the tire is vulcanized and molded using a mold.

In this die, for example, an outer peripheral molding die a for forming a tire outer peripheral portion as shown in FIG. 8 (A) and a molded tire can be easily taken out. As shown in B), a sector b in which the outer peripheral molding die a is divided into a plurality of pieces in the circumferential direction is used.

Each of the outer peripheral molding die a and the work w such as the sector b is made of an aluminum alloy and is newly molded by casting. For example, as shown in FIG. 9 and FIG. 10, water glass is mixed and solidified in the molding sand to form the outer side surface of the work w inside the outer frame c for casting, and a core is formed in the center portion as necessary. Space f inside sand mold d provided with e
At the same time, a hot and fluid aluminum g is poured from the runner h, and the aluminum g is cooled together with the sand mold d.

When the aluminum melt g is poured, the gas contained therein is poured in from the bottom in order to facilitate the divergence of the gas. Therefore, the gate i is provided below the casting outer frame c.

When forming the sand mold d, a so-called wooden or metal so-called metal or metal which is formed in the casting outer frame c in substantially the same size and shape as the outer peripheral molding die a or the sector b is formed. A wooden mold j is placed, and the wooden mold j and the casting outer frame c
The molding sand is densely filled in the void formed between the inner peripheral surface of the mold and the inner peripheral surface of the mold. Further, the casting sand is appropriately cooled and buried with a gold m.

The wooden mold j is provided with a runway k leading to the runway h, and the runway k is formed so as to extend in the horizontal direction beyond the work w itself to be cast.
When removing the wooden mold j, the casting outer frame c is reversed,
It is necessary to turn the bathtub k outward.

[0008]

Such a reversing operation of the casting outer frame c is conventionally performed as shown in FIG. 12 when the casting outer frame c is loaded with both the wooden mold j and the sand mold d. By suspending the casting outer frame c using the sling 1 and orbiting the sling l,
He tilted over 0 ° and took out the wooden mold j with the bathtub k facing outward.

In the rotating work, since the weight of the casting outer frame c including the contents is 80 to 900 kg, the wooden mold j
In addition to a regular worker who takes out the work, it requires one or two auxiliary workers to hold the slanted casting outer frame c in the slanted state, resulting in poor work efficiency. Moreover, the outer frame for casting c
Since it is suspended by the sling 1 in the air, there is a risk that the outer frame c for casting may drop due to the cutting of the sling 1. Since this work requires a crane, other work for operating the crane was often interrupted.

In order to solve one of the above problems, a method of reversing a casting outer frame by using an arm body, as disclosed in, for example, JP-A-2-261729, or JP-A-49-24.
As proposed by Japanese Patent No. 834, a method of sandwiching the casting outer frame by a pair of rotating arms and reversing the casting outer frame by rotating the rotating arm has been proposed. Since the cantilever arm is used, the rotating device itself has a large structure, resulting in a high equipment cost.

According to the present invention, a toothed rotary body is provided on a support shaft provided in the casting outer frame, and a bearing seat for axially supporting the support shaft and a rotating device for rotating the toothed rotary body are provided on the base. Based on this, it is an object of the present invention to provide a casting sand mold reversing device capable of rotating the casting outer frame with a safe and simple structure and solving the above problems.

[0012]

According to claim 1 of the present invention, a pair of support shafts are provided on the outer peripheral surface of a flat and cylindrical peripheral frame whose both ends are open, at the intermediate height and concentrically, An outer frame for casting in which a rotating body with teeth is attached to the support shaft, and a pair of bearings capable of rotating the peripheral frame around the center line of the support shaft by horizontally supporting the support shaft on the base. A sand type reversing device for casting comprising a sand reversing device provided with a rotating device which is engaged with the toothed rotating body of the support shaft supported by the bearing portion and rotates the supporting shaft by rotating the toothed rotating body. Is.

Further, according to the present invention, the toothed rotating body is a sprocket, and the rotating device is provided on both sides of the support shaft supported by the bearing portion and has upper ends of pitch circles at the lower end of the sprocket. A pair of receiving sprockets disposed above the upper and lower sides, and curved in a protruding shape that meshes with the lower parts of the pitch circles of the sprockets in the receiving sprockets on both sides, and by removing the support shaft from the bearing portion 2. The casting sand mold reversal for casting according to claim 1, further comprising: a chain that is connected by a substantially straight line at the upper end of the pitch circle of the receiving sprocket, a drive device that drives this chain, and a tensioner portion that absorbs the slack of the chain. It is a device.

According to the first aspect of the present invention, there is no need for an auxiliary worker conventionally arranged for maintaining the posture of the rotated casting outer frame, and in the present invention, the rotating device uses the conventional arm. Since the configuration is simpler than that used, equipment cost can be reduced. Moreover, only by supporting the casting outer frame with the bearing portion, the toothed rotating body can be engaged with the rotating device, and the engagement and disengagement of the casting outer frame and the rotating work thereof can be performed without requiring skill. It is possible to prevent falling of the outer frame for casting and improve work safety.

According to a second aspect of the present invention, the rotating device has the above-mentioned structure 1.
When it is formed by the pair of receiving sprockets, the chain, and the tensioner portion, the simplification of the operation, the assurance of the operation, and the simplification of the configuration can be further enhanced.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings, taking a case where a work W is a mold for molding a tire outer periphery as an example.

1 to 6, a sand mold reversing device 1 for casting
Is composed of a casting outer frame 2 and a sand-type reversing tool 3 that supports the casting outer frame 2 and includes a rotating device 4 that rotates the casting outer frame 2.

The casting outer frame 2 has a flat and cylindrical peripheral frame 5 whose both ends are open. In this example, the peripheral frame 5 is formed to have a substantially cylindrical cross section, and has a peripheral surface 5a. At the intermediate position in the height direction, there are provided a pair of support shafts 6, 6 projecting outward in the circumferential direction and concentrically. A toothed rotating body 7 composed of a sprocket 9 is attached to the support shaft 6 so as to be rotatable together. A bottom plate 21 is detachably provided on the lower edge of the peripheral frame 5.

Inside the surrounding frame 5, as shown in FIG. 11, a wood type wooden mold J having the same shape and size as the outer surface of the work W is arranged. The wooden mold J and the surrounding frame are arranged. In the space between the inner peripheral surface of 5 and the inner peripheral surface of 5, the sand mold D is formed by mixing the foundry sand with water glass and squeezing it. Further, the sand mold D is formed with a runner H for injecting a high-temperature metal fluid, which is a raw material of the work W, in this example, an aluminum alloy fluid.

In addition to forming the work W, the wood pattern J is
A runway K leading to the lower end of this runway H is extended to the lower portion of the casting outer frame 2. Therefore, the wooden pattern J is expanded in the lower portion where the runner K exists. Therefore, since the sand mold D is formed, the wooden mold J cannot be taken out upward and must be taken out downward. Therefore, the casting outer frame 2 must be rotated so that the molten metal passage K faces outward. Of.

The sand inverting device 3 is provided with a bearing portion 11 for supporting the support shaft 6 on a base 10 and the rotating device 4 for rotating the support shaft 6.

In this example, the base 10 is horizontal to the upper edges of a pair of standing pieces 24, 24 rising from a base piece 23 placed on the floor, as shown in FIGS. Upper piece 25, 25
Is provided.

In the present example, the bearing portion 11 is formed by a bearing piece 27 extending upward from each of the upper pieces 25 and having a hole portion 26 having an upper opening. By inserting the support shaft 6 of the casting outer frame 2 into the hole 26 from the opening, the bearings 11, 11 can pivot the support shafts 6 facing each other horizontally. I can. Further, by supporting the support shafts 6 and 6, respectively, the peripheral frame 5 can be rotated around the support shaft center line L passing through the axis of the support shaft 6.

As shown in FIG. 5, the bearing portion 11 is loosely fitted to shaft bodies 29 and 29, which are arranged at intervals in a direction orthogonal to the support shaft 6 and extend in the direction of the support shaft 6, respectively. The support shaft 6 can also be rotatably supported by the pair of rollers 30, 30.

The support shaft 6 of the casting outer frame 2 is rotated by a rotating device 4.
It is rotated by driving. In this example, the rotating device 4 includes a pair of receiving sprockets 12, 12 rotatably supported by bearings arranged on the base 10 on both sides of the bearing portion 11, and the pair of receiving sprockets 1.
An endless annular chain 13 that meshes with the upper end portions of the pitch circles 2 and 12 and a drive sprocket 31 that meshes with the chain 13 at the output end, and the drive sprocket 31 can rotate the chain 13 by the rotation of the drive sprocket 31. 14 and a tensioner portion 15 capable of absorbing the slack of the chain 13.

In the present embodiment, the drive unit 14 is formed by connecting a worm reducer to the motor, and the worm reducer has a self-locking mechanism so that the chain 13 escapes when the motor is stopped. Can be prevented.

The tensioner portion 15 has a receiving sprocket 13
Between the drive sprocket 31 and the chain 13
The biasing means 3 such as a spring is oriented in a direction capable of removing the slack.
2 is formed as a spring take-up 33, and in this example, the spring take-up 33 is provided.
Is one of the receiving sprocket 12 and the driving sprocket 31
, And between the other receiving sprocket 12 and the drive sprocket 32. By arranging the pair of spring take-ups 33, 33 in this way, absorption of the amount of slack in the chain is increased, and fluctuations in the position of slack in the chain 13 caused by forward and reverse operation of the drive machine 14 are also accommodated. Therefore, the chain 13 can be surely prevented from sagging.

Further, the receiving sprocket 13 has a sprocket 9 mounted on the support shaft 6 when the bearing 11 supports the support shaft 6 of the casting outer frame 2 at the upper end portion of its pitch circle. The height of the upper end portion is located above the lower end portion.

However, as shown in FIG. 4, when the casting outer frame 2 is disengaged from the sand-type reversing tool 3, that is, when the support shaft 6 is not supported by the bearing portion 11, the chain 14 has a tensioner portion. Since the slack is removed by being pressed inward by the biasing means 32, 32 of 15, the driving sprocket 31 and the pair of receiving sprockets 12, 1 are
2 mesh positively with each of the two, and thus drive 1
By driving 4, the chain can be orbited by the guide of each said sprocket 31, 12, 12.

Further, as shown in FIGS. 1 and 2, when the casting outer frame 2 is attached to the mold reversing tool 3, that is, when the support shaft 6 is supported by the bearing portion 11, the bearing portion 1 of the support shaft 6 is provided.
By seating on 1, the sprocket 9 having the toothed rotation resistance 7 attached to the support shaft 6 and the chain 13 can mesh with each other between the pair of receiving sprockets 12, 12. The chain 13 is bent in a V-shape between the receiving sprockets 12 and 12 against the biasing force of the tensioner portion 15 due to the meshing with the sprocket 9, and as a result, the lower end portion of the sprocket 9 receives the receiving sprocket 1.
The sprocket 9 can be reliably meshed with the chain 13 by being positioned below the upper ends of the gears 2 and 12 and meshing with each other. Moreover, the slack of the chain 13 is absorbed by the tensioner portion 15 so that the chain 13 can surely make a round trip.
Since 4 has the self-locking mechanism as described above, even if the driving machine 14 is stopped, the casting outer frame 2
It can be placed horizontally and in a stable posture without rocking.

Further, the driving machine 14 is driven to drive the chain 1
By rotating 3 around, the sprocket 9 of the casting outer frame 2 meshing with the chain 13 rotates, and the casting outer frame 2 rotates about the support shaft 6 as shown in FIG. The rotation angle of the casting outer frame 2 must be at least 90 °, which is necessary for removing the wooden mold J from the sand mold D, and a maximum of 180 °. When the rotating device 4 having such a configuration is used,
The time required to rotate 0 ° is 8 to 12 seconds, and a quick rotational movement can be achieved.

After the casting outer frame 2 is rotated to a predetermined angle, the driving machine 14 is stopped so that the casting outer frame 2
Stops in a rotated position. Moreover, since the driving mechanism 14 of the chain 13 has a self-locking mechanism, the casting outer frame 2 does not return due to its own weight, and the posture in a safely rotated state can be maintained.

Further, regardless of the size of the outer frame, the outer frame 2 for casting has a plurality of types of castings having different shapes by unifying the pitch diameters of the toothed rotary endurances 7 attached to the support shaft 6 to the same size. Without any special setup change of the outer frame 2 ...
It can be rotated by being attached to a single mold reversing tool 3.

By using the casting sand mold reversing device 1 having such a structure, the wooden mold J buried in the sand mold of the casting outer frame 2 can be taken out quickly and safely, thereby improving the work efficiency. I was able to plan.

In order to prevent the chain 13 from running away, a brake device or the like for holding the chain may be provided in synchronization with the stop of the driving machine.

FIG. 7 shows another mode of the tensioner portion 15. In this example, one idler wheel 3 is provided between the one receiving sprocket 12 and the driving sprocket 31.
5 is interposed and the chain 13 is 180 ° between the idler wheel 35 and the drive sprocket 12.
A spring take-up 33A in which a drum 36 wound at a winding angle of 3 is biased by a biasing means 32A in a direction to remove the slack of the chain 13 is interposed.

Such spring take-up 33A
By using, the slack of the chain 13 can be effectively removed, and one spring take-up 33
The tensioner portion 15 can be formed of A.

As for the driving machine used for the sand-type reversing device 3, the chain 1 is provided at one point of the revolving chain 13.
It can also be formed by a linear reciprocating actuator capable of pushing and pulling 3. As described above, the present invention can be modified into various aspects.

[0039]

As described above, since the casting sand mold reversing device of the present invention has the above-mentioned structure, the casting outer frame can be rotated with a simple structure and can be held in the rotated posture. As described above, an auxiliary worker for maintaining the inclination of the casting outer frame is not required, so that labor can be saved and equipment cost can be reduced.

Moreover, since the casting outer frame is rotatably held only by supporting the casting outer frame with the bearing portion, engagement and disengagement of the casting outer frame and rotation work can be carried out without requiring skill, and It is possible to prevent the casting outer frame from falling and improve work safety. Therefore, when the present apparatus is used for taking out the wooden mold from the casting outer frame, the work can be performed safely and efficiently, and the work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is a side view showing a state when the casting outer frame is rotated.

FIG. 4 is a side view showing a state in which the casting outer frame is removed.

FIG. 5 is a cross-sectional view showing another form of the bearing portion.

6A and 6B are cross-sectional views schematically showing the operation of the rotating device.

FIG. 7 is a cross-sectional view showing another form of the tensioner portion.

8A and 8B are perspective views illustrating a work in both FIGS.

FIG. 9 is a cross-sectional view showing an example of means for casting using a casting outer frame.

FIG. 10 is a sectional view taken along line XX.

FIG. 11 is a cross-sectional view showing an example of forming a sand mold by using a wooden mold for the outer frame for casting.

FIG. 12 is a perspective view showing an example of reversing a conventional casting outer frame.

[Explanation of symbols]

 2 Casting outer frame 3 Sand reversing device 4 Rotating device 5 Surrounding frame 5a Outer peripheral surface 6 Support shaft 7 Toothed rotating body 10 Base 11 Bearing section 12 Bearing sprocket 13 Chain 14 Drive unit 15 Tensioner section L Spindle center line

Claims (2)

[Claims] 1. A casting in which a pair of support shafts having an intermediate height and concentric with each other are provided on the outer peripheral surface of a flat and cylindrical peripheral frame whose both ends are open, and a toothed rotary member is attached to this support shaft. An outer frame for use, and a pair of bearings capable of rotating the peripheral frame around the center line of the supporting shaft by horizontally supporting the supporting shaft on the base, respectively.
A sand type reversing device for casting comprising a sand reversing device provided with a rotating device which is engaged with the toothed rotating body of the support shaft supported by the bearing portion and rotates the supporting shaft by rotating the toothed rotating body. . 2. The toothed rotating body is a sprocket, and the rotating device is provided on both sides of the support shaft supported by the bearing portion, and the upper end of the pitch circle is located above the lower end of the sprocket. The pair of receiving sprockets arranged to be positioned are curved so as to engage with each other in the lower portion of the pitch circle of the sprocket in the receiving sprockets on both sides, and by removing the support shaft from the bearing portion, The chain comprises a chain connected at the upper end of the pitch circle by a substantially straight line, a driving machine for driving the chain, and a tensioner section for absorbing the slack of the chain.
The casting sand mold reversing device described.