JPS63235063A - Apparatus for removing core sand of casting - Google Patents

Abstract

PURPOSE:To facilitate removal of core sand by fixing each facing plate to two facing end parts of shafts as horizontally rotatable, making one part of the facing plates as horizontally tiltable and arranging plural vibrating shock generators to the other part of the facing plates. CONSTITUTION:Supporting members 2, 3 are arranged at both end parts of a frame 1 and the shafts 6, 7 are horizontally and rotatably set through bearings 4, 5. The facing plates 8, 9 are respectively arranged to the facing end parts of the shafts 6, 7 and also in the facing plate 8, a holding device for executing positioning and holding of the product is arranged. In the other face plate 9, the plural air hammers 19 are arranged and hitting parts 20 thereof are arranged as facing to the facing plate 8. By working the cylinders 15, 12, the facing plate 8 is tilted to fit the product, and next the facing plate 8 is returned back to the original position and the core sand is removed by the air hammers 19 through vibration and shock. As fitting of the product and sand part are smoothened, the core sand is easily removed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for removing core sand from castings, and is particularly suitable for removing casting products that are large and heavy and have complex internal and external shapes. This invention relates to a device for removing difficult core sand.

[Conventional technology]

After casting the molten metal into a casting, excess materials such as sprue, runner, and core sand are removed in common. In general, core sand is removed by methods such as hitting with a hammer, digging with a chisel, vibration with a shakeout machine, or core knockout. Removal of core sand by sandwiching a cast product between a vibrator and a clamp cylinder does not pose any problem if the product is small or has a simple internal shape. However, in the case of heavy products with complex internal and external shapes, such as manifolds, there are many problems in energy efficiency, propagation methods, handling, etc. for removing core sand. The drawbacks were that it took a long time to remove the core sand and the surface of the product was damaged. Conventionally used means to solve the above-mentioned drawbacks include applying rotation and vibration shock to the product at the same time. For example, as a method for using core sand for products such as cylinder heads, there is a method disclosed in Japanese Patent Laid-Open No. 71226/1983.

[Problem that the invention seeks to solve]

In the core sand removal device as described above, the position for transmitting the vibration impact to the cast product is fixed, and the vibration frequency and impact force are constant, so it can be applied to a wide variety of products. I can't.

When installing the product, since it is set vertically, it is difficult to position the heavy product.Also, for products that are cast at low temperatures, such as aluminum alloy castings, the strength of the core may be lower than the casting temperature. Since the sand is almost the same as before, the sand remains without collapsing, making it difficult to remove the sand in this case.

The present invention makes it possible to efficiently remove core sand even if the inside of the product has a complicated shape, and to control the vibration impact force in accordance with the product.

[Means for solving problems]

(b) Two shafts are rotatably provided on the support member via bearings in a horizontal state and with their axes aligned.

(b) A face plate is fixed to each end of the shaft facing the other shaft, so that a cast product can be held between the two-sided plates.

C. One shaft is formed to be freely rotatable around a vertical axis, and the other shaft is formed to be freely movable in the axial direction.

2. On one of the face plates of Yuzuki, there are multiple vibration impact generators facing the other side, the frequency and impact force of which can be independently controlled, and the position of transmitting the vibration rR shock to the product is variable. to be placed.

A device for positioning and holding the product is disposed on the other face plate such that the face plate can be tilted into a horizontal position during installation and removal of the product.

〔Example〕

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a first view along arrow A-A, and FIG. 3 is a view of a positioning and holding device. In both figures, 1 is a frame.

Support members 2 and 3 are provided at both ends in the longitudinal direction, and bearings 4 are provided at each end.
, 5, the shafts 6.7 are rotatably provided in a horizontal state with their axes aligned. Face plates 8, 9 are fixed to the ends of the shafts 6, 7 facing the other shafts, respectively. A base plate 10 on which the bearing 4 on the left side in FIG. Further, the support member 2 is provided movably at right angles to the axial direction of the shaft 6 via a guide bar 24 provided on the frame 1. Reference numeral 13 denotes a cylinder, which is provided at the end of the support member 25 so that its axis substantially coincides with the shaft 6.7, so that the movable element 14 can freely come into contact with the bearing 4 and move away from it. 15 is a cylinder, and rod 1
6 is provided so as to be able to come into contact with and separate from the locking piece 17 provided on the face plate 8. The face plate 8 is provided with a device 26 for positioning and holding the product.

The right support member 3 located in FIG.
The shaft 7 is provided so as to be movable in the axial direction of the shaft 7 via a guide bar 18 provided at the shaft 7. Two or more air hammers 19 are mounted on the face plate 9 so that their striking parts 20 face the face plate 8, and the intervals between the air hammers 19 are adjustable. 21 is a motor, which is connected to the shaft 7 via a pulley 22. 23 is a pipe line for compressed air;
It penetrates the inside of the shaft 7 and communicates with the air hammer 19.

With the above configuration, the function can be to attach and detach the product, and also to remove the core sand.

To install the product.

The cylinder 15 is operated to bring the rod 16 into contact with the locking piece 17 to prevent rotation of the shaft and face plate 8, and then the cylinder 12 is operated.

By tilting the toggle link 11, the plywood 10 and the bearing 4 are tilted. At the same time that the face plate 8 is in a horizontal state, the face plate 8 is moved to the working side via a driving means such as a cylinder (not shown) and the guide bar 24, and the position of the product is determined on the face plate 8. The device 26 for holding the product is such that the product is fixed on a block 28 made of sesame oil, fixed at one or several locations of the runner with a toggle clamp 27, and after the product is attached to the face plate 8, becomes vertical by performing the above-mentioned reverse operation. Drive means such as cylinders (
The support member 3 is moved to the left via the handle (not shown), and the striking part 20 of the air hammer 19 is brought into contact with the product. In this case, the cylinder 13 is operated to bring the mover 14 into contact with the bearing 4 to prevent the shaft 6 from tilting. To remove the core sand, after stopping the operation of the cylinder 15 and separating the rod 16 from the locking piece 17, the air hammer 19 is operated via the pipe line 23, and the striking part 20 applies vibration and V to the product.
Transmit R impact force. When the shaft 7 is rotated via the pulley 22 by driving the motor 21.

The face plate 8 and shaft 6 also rotate. Therefore, the core sand in the product collapses due to the vibration and impact force generated by the air hammer 19 and swings and rotates. is removed. The compressed air pressure is switched by a two-stage electromagnetic valve (not shown), high pressure and low pressure, to promote fine disintegration of the core sand in a high pressure atmosphere, and to promote sand discharge in a low pressure atmosphere. . After sand removal is complete,
Move the support member 3 to the right, remove the product from the face plate 8,
Next, install other products. In this case, as shown in FIG. 1, the operation of the cylinder 13 is stopped and the mover 14 is
and then operate the cylinder 15.

The rod 16 is brought into contact with the locking piece 17 to prevent rotation of the shaft 6 and the face plate 8, and the cylinder 12 is actuated to bring the first face plate 8 into a horizontal state and the first face plate 8 is moved to the working side. Since the face plate 8 is in a horizontal state, that is, the product can be easily pulled horizontally, installation and removal are facilitated.

Next, what are the frequency and impact force of the air hammer 19?

Since each air hammer is independently variable, and the vibration and impact force transmission position and compressed air pressure are variable, it is possible to create an appropriate resonance state for the product. This makes it possible to shorten the time for the core sand to collapse.

In this example, an example using two air hammers was shown, but
Three or more air hammers may be used depending on the material of the product, its shape and dimensions, the shape of the core, etc.

〔Effect of the invention〕

Since the present invention has the structure and operation as described above,
The following effects can be obtained.

(1) By arranging a plurality of vibration impact generating devices that can freely control the frequency and impact force, it is possible to double the acceleration of the impact force on the cast product.

Since resonance can be induced, the core sand can be removed easily and in a short time.

(2) Correspond to the shape of the product and the shape of the core.

By selectively applying a large impact force to areas where core sand is difficult to disintegrate and remove, core sand can be removed smoothly.

(3) By imparting rotation to the product, core sand can be easily discharged from the product.

(4) Since the vibration impact transmission position is variable, the range of applicable products is wide.

(5) When installing the product, place the face plate in a horizontal position.
Easy to install and remove heavy products.

(6) The positioning and holding device allows a part of the hammer to be pressed against a predetermined part of the product, and the pressed part does not shift in position during vibration shock, causing damage to the product due to part of the hammer. 6.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a partial cross-sectional view taken along line A--A in FIG. 1, and FIG. 3 is a view of a positioning and holding device. 2.3: Support member, 4, 5: Bearing, 6, 7: Shaft,
8, 9: face plate, 19: air hammer, 2o: striking section, toggle lamp, 27.28 niblock.

Claims (3)

[Claims] (1) Two shafts are horizontally and rotatably provided on a support member with their axes aligned and facing each other via bearings, and a face plate is fixed to each end of the shaft opposite to the other shaft. , a cast product is formed between the double-sided plates so that they can be sandwiched, and at least one shaft is formed so as to be movable in the axial direction,
A plurality of vibration impact generators facing the other face plate are arranged on one of the face plates to control the vibration frequency and impact force independently, and to change the position of transmitting the vibration impact to the cast product. 1. A casting core sand removal device, characterized in that the face plate to which it is attached has a driving device that can be tilted horizontally, and a casting product positioning and holding device is provided. (2) The casting core sand removal device according to claim 1, wherein the vibration shock generating device is an air hammer. (3) Core sand for castings according to claim 1 or 2, wherein the means for moving the shaft in the axial direction and the means for tilting the face plate are a toggle link and an air cylinder, and the means for holding the cast product is a toggle clamp. removal device.