JP3138895B2 - Sand mold releasing method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for separating a cast product by breaking a sand mold after sand casting.

[0002]

2. Description of the Related Art For example, when a mass-produced casting product such as a cylinder sleeve of a vehicle is cast with a sand mold, a plurality of sets of sand molds are arranged in a bucket in order to improve work efficiency and work environment. The buckets are arranged on a conveyor and cast into a sand mold. In addition, after casting, the sand mold is dropped on a vibrating device such as a vibrating conveyor or the like, which is tilted and inverted on a conveyor being conveyed during conveyance, and the sand mold is dropped, and the sand mold is broken down using the drop impact force. In addition, in many cases, a separating step is performed by a line in which the casting product is advanced in a certain direction while sand is dropped by the vertical vibration means of the vibration device.

[0003]

However, in the mold separating means in the above process, if the falling distance of the sand mold from the bucket to the vibrating device is long when the bucket is tilted and inverted, separation of the sand mold from the casting product, that is, the sand mold is performed. Although the mold release effect is improved, the impact force of the cast product on the vibrating device and the impact force of the cast products increases, and there is a problem that the damage of the cast product such as cracks and bruises increases. When the falling distance to the vibrating device is reduced, the effect of releasing the sand mold becomes weaker, which causes a problem that the subsequent vibrating device cannot efficiently separate the sand from the casting product. Further, in the conventional equipment, there is a problem that it is difficult to easily change the drop condition of such a sand mold according to a different casting product such as a shape, a size and a casting method.

Accordingly, the present invention is a method and an apparatus for separating a cast product from a sand mold, wherein the sand mold housed in the bucket can be removed without damaging the cast product inside. It is another object of the present invention to provide an efficient mold release method and apparatus capable of selecting appropriate conditions for separating a casting product by breaking a sand mold as much as possible, and which can easily cope with casting products having different shapes and the like. Is what you do.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a sand mold and a casting product cast into the sand mold by inverting a bucket for storing the sand mold and dropping the sand mold onto a receiving table. In the method of separating the mold, a receiving plate that is vertically movable and tiltable is provided between the bucket and the receiving table, and the sand mold is gradually dropped from an arbitrary height. In a sand mold separating device for separating a sand mold and a casting product cast in the sand mold,
A transport mechanism for loading and unloading the bucket containing the sand mold; a reversing mechanism for holding and reversing the bucket together with the transport mechanism; and a reversing mechanism disposed at an interval from the transport mechanism to drop when the bucket reverses. And a delivery mechanism having a vertically movable and tiltable delivery plate for receiving and dropping the sand mold, wherein the sand mold of the bucket is dropped stepwise onto a receiving table disposed below. We propose a demolding device.

[0006]

[Function] When the bucket storing the sand mold after casting is turned over and the falling sand mold is received by the receiving plate, the mold is separated to some extent, and the receiving plate is tilted to drop the sand mold onto the receiving table. Thereby, sufficient mold release can be performed without damaging the cast product. Also,
In the case of the demolding device, the bucket containing the sand mold after the completion of the casting, which is transported by the external transport conveyor or the like, is received by the transport mechanism in the reversing mechanism and stopped, and the reversing mechanism is rotated 180 ° while holding the bucket. When the bucket is turned and the bucket is turned over, the sand mold stored in the bucket falls on the transfer plate located below, and the mold is separated in the first stage. Next, after the transfer plate is adjusted to an appropriate height position by the lifting and lowering mechanism, and is tilted by the tilting mechanism, the transfer plate is dropped on a receiving table located further below and the second plate is dropped.
A stage separation is performed. By providing the delivery mechanism in a plurality of stages, it is possible to perform a multi-stage mold release in which the drop impact force on the casting product is further suppressed. Since the delivery plate can be moved up and down and tilted freely, it can be easily adjusted to an appropriate height according to the sand mold release condition.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a front view of the mold release device of the present invention, and FIG.
FIG. 3 is a side view of the mold release device showing the transport state of the bucket of FIG. 1, and FIG. 3 is a front view of the mold release device of FIG.

In the mold release apparatus A shown in FIG. 1, two pairs of large and small support rollers 2A and 2B are supported on the gantry 1 via bearings, and the two pairs of support rollers 2A and 2B are paired with two pairs of annular members. The guide rail 3 is supported, and a reversing device 4 is formed in a drum shape as a reversing mechanism with the guide rail 3. A chain 5 is wound around each guide rail 3, and the chain 5 is connected to one support roller 2 </ b> A. The reversing device 4 can be rotated at least 180 ° by being engaged with a sprocket wheel 6 coaxially mounted and driven by a deceleration motor (not shown).

On the guide rail 3, as shown in FIG.
A transport conveyor 7 composed of a roller conveyor is attached as a transport mechanism for the bucket, and a bucket 9 placed on the transport conveyor 7 can be moved by a motor 9 attached to an end of a part of the rollers 8. The motor 9 is stopped by a bucket detecting mechanism (not shown), and at the same time, the bucket 10 is temporarily fixed at that position. , Bucket 10
A positioning pin 11 made of a piston rod which can be engaged with the conveyor 7 is attached to the conveyor 7. The transport conveyor 7 is connected to external transport conveyors 12A and 12B formed of the same type of roller conveyor, and a bucket 1 is provided between the transport conveyor 7 and the external transport conveyors 12A and 12B.
0 can be accepted and delivered.

As shown in FIG. 1, the reversing device 4 and the transfer conveyor 7 are provided with an angle steel material which abuts on upper and lower sides of both right and left sides of a bucket 10 placed on the transfer conveyor 7 to perform left and right positioning. An upper guide 13 and a lower guide 14 are fixedly mounted on the upper guide 13, and a stopper 15 made of a channel steel material or the like is fixed on the upper guide 13 in a state where a slight gap is formed between the upper guide 13 and the upper end of the bucket 10. As will be described later, the bucket 10 is designed to stop falling when the bucket 10 is inverted.

A delivery plate 16 for sand type delivery is arranged above the conveyor 7 so as to be located above the bucket 10 on which the delivery plate 1 is placed.
Numeral 6 is held by the reversing device 4 so as to be able to move up and down and tilt freely, and is rotated by the reversing device 4 in the same manner as the transport conveyor 7. That is, an elevating / lowering air cylinder 18 is attached to a gantry 17 fixed in the reversing device 7, and an elevating member 20 for holding a tilting air cylinder 19 is attached to a piston rod 18 a of the same, and rotates together with the delivery plate 16. Possible set of delivery mechanisms 21
Is composed.

The lifting member 20 is connected to the delivery plate 16.
The support plate 22 is supported by a support shaft 23, and the support plate 22 has an end opposite to the delivery plate 16 side with the support shaft 23 interposed between the support rod 22 and the piston rod 19 of the tilting air cylinder 19.
The delivery plate 16 is rotated or tilted about the support shaft 23 by the contraction of the piston rod 19a as described later with reference to FIG. 24 is a guide plate for a sand mold 25 which falls when the bucket 10 is turned over. A vibration conveyor (not shown) for separating the mold is arranged below the reversing device 4 so that the sand mold 25 from the delivery plate 16 can be received.

In the mold release apparatus of the embodiment configured as described above, as shown in FIG.
When the bucket 10 containing the container 5 is carried by the external conveyor 12A onto the conveyor 7 in the reversing device 4 and reaches a predetermined position, a bucket detecting mechanism (not shown)
When the bucket 10 is detected, the drive motor 9 of the conveyor 7 stops, and the positioning pin 11 projects from below and engages with the bucket 10 to stop. In this state, the bucket 10 is in a state of being constrained by the conveyor 7 by the upper guide 13 and the lower guide 14 as shown in FIG.

Next, the guide rail driving motor of the reversing device 4 is operated to drive the chain 5 wound in the guide rail 3 via the sprocket wheel 6 so that the reversing device 4 is placed on the conveyor 7. It rotates in the direction of arrow X while holding the bucket 10. When the reversing device 4 rotates and is turned 180 ° as shown in FIG. 3, the bucket 10 tries to drop downward, and is prevented from falling by contacting the stopper 15, and the sand mold stored in the bucket 10 is stopped. 25 falls as it is, and falls on the receiving plate 16A which is waiting at the position of the virtual line shown. Due to the impact at the time of the drop, the sand mold 25 is slightly collapsed, and the mold is separated to some extent.

Further, at this position, the upper part of the sand mold 25 placed on the delivery plate 16A is not completely removed from the bucket 10 as shown in the figure, so that the lifting / lowering air cylinder 18 is operated. The delivery plate 16A is lowered, the sand mold 25 is pulled out of the area of the bucket 10, and the delivery plate 16 is stopped at a position indicated by a solid line that has been determined in advance.

Next, when the tilting air cylinder 19 is actuated, the delivery plate 16 rotates leftward in the drawing with the support shaft 23 as a fulcrum, and the delivery plate 16B shown by a virtual line.
And the sand mold 25 placed thereon is dropped on a vibrating conveyor (not shown) waiting below, and the mold is separated. The sand mold 25, which has been broken to some extent by the first-stage mold release, can be sufficiently collapsed by the second-stage mold release without damaging the internal casting product. The sand removal work by the vertical vibration of the work can be performed efficiently.

In the above embodiment, one set of delivery mechanisms is used. However, two or more sets of delivery mechanisms may be used in accordance with the conditions of a cast product or the like. Note that the chains 5 for driving the guide rails 3 of the reversing device 4 may be provided on one side instead of in pairs.

[0018]

As is apparent from the above description, according to the present invention, in the automatic mold releasing step, the sand mold after casting using the receiving plate is gradually and appropriately placed on the receiving stand such as a vibrating device. Since it can be dropped from the height position,
The sand mold can be separated without damaging the cast product. In addition, since the delivery plate can be moved up and down and tilted freely, various casting products are also provided.
It is possible to adjust the drop impact degree of the sand mold by changing the height position of the delivery plate or combining the lowering and tilting of the delivery plate according to its shape, dimensions or casting plan, etc. Separation can be performed.

[Brief description of the drawings]

FIG. 1 is a front view of a mold release device of the present invention.

FIG. 2 is a side view showing a state of transporting buckets of the mold release device of FIG. 1;

FIG. 3 is a front view showing a reversal state of a bucket of the mold release device of FIG. 1;

[Explanation of symbols]

 A-type separation device 1 base 2A, 2B support roller 3 guide rail 4 reversing device 5 chain 6 sprocket wheel 7 transport conveyor 8 roller 9 drive motor 10 bucket 11 positioning pin 12A, 12B external transport conveyor 13 upper guide 14 lower guide 15 stopper 16 Delivery plate 17 Stand 18 Air cylinder for lifting and lowering 19 Air cylinder for tilting 20 Lifting member 21 Delivery mechanism 22 Support plate 23 Support shaft 24 Guide plate 25 Sand mold

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-305357 (JP, A) JP-A-2-261729 (JP, A) JP-A-9-10465 (JP, A) JP-A-54-1979 141338 (JP, A) JP-A-49-11730 (JP, A) JP-A-3-64920 (JP, U) JP-A-3-42359 (JP, U) JP-A-58-152366 (JP, U) Japanese Utility Model Showa 55-148857 (JP, U) Japanese Utility Model Showa 51-9010 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 29/00 B22D 29/04

Claims (2)

(57) [Claims] A method for separating a sand mold and a casting product cast in the sand mold by inverting a bucket for storing the sand mold and dropping the sand mold onto a receiving stand, wherein the bucket and the receiving stand are separated from each other. A method for releasing a sand mold, comprising a receiving plate which is movable up and down and tiltable in the middle, and the sand mold is dropped from an arbitrary height in a stepwise manner. 2. A sand mold separating device for separating a sand mold and a casting product cast in the sand mold, a transport mechanism for loading and unloading a bucket containing the sand mold, and holding the bucket together with the transport mechanism. A transfer mechanism that is disposed at a distance from the transport mechanism and receives the sand mold that falls when the bucket is turned over, and that receives a sand mold that falls and falls down, and a transfer mechanism that includes a vertically movable and tiltable transfer plate. Wherein the sand mold of the bucket is dropped in a stepwise manner on a receiving table disposed below.