JPS619962A - Method and device for stripping sand from casting - Google Patents

Abstract

PURPOSE:To collapse the core sand of a casting and to strip efficiently and easily the sand therefrom by oscillating the casting contg. the core sand by a chipping machine and ejecting and supplying compressed air to the core sand of the casting. CONSTITUTION:The casting having the core sand 22 is positioned and supported on a jig plate 4 of a base flask 1. The above-mentioned casting 20 is oscillated by a chipping hammer device which is disposed to the upper horizontal flask 2 of the flask 1 and consists of a cylinder unit 5, a chipping machine 6, a hammer 602, etc. The compressed air supplied from a hose 12 is ejected and supplied to the core sand 22 from nozzles 11 attached to a support plate 10 through the through-holes 401 of the plate 4 and the sand discharge holes 23 of the casting 20. The collapsion of the sand 22 is thus accelerated and the sand is efficiently discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for removing core sand from a cast product having a core.

(Prior art) Conventionally, in order to remove a core from a cast product, firstly, the core is removed by giving a vibration impact to the cast product with a chipping hammer, and secondly, the process before sand removal is performed to remove the core from the cast product. The product is heated, the core strength is reduced, the cast product is chipped, and the core is removed. Thirdly, as disclosed in JP-A-58-148073, a chip and a ping hammer are placed inside the core of the cast product. There is a method such as the one described above, in which the hole is pushed in, and while blowing out compressed air from the tip of the hammer, the hole is chipped and the center hole is removed.

(Problems to be Solved by the Invention) In the above-L prior art, the first and! In method @3, the part of the core that is exposed to the outside of the cast product (the core baseboard part) is large, and if the core shape is not simple, the sand removal performance of the core will be poor. The method of WIJ2 is dependent on the shape and is not suitable for complex-shaped items.The method of WIJ2 requires an extra step to heat the cast product, which increases the number of steps, making the work troublesome, complicated, and expensive.

The present invention has been made to solve the above technical proposition.

(Objective of the Invention) An object of the present invention is to provide a method for removing core sand from a cast product, which efficiently and accurately disintegrates the core within the cast product, and significantly improves sand removal performance. In addition, it is an object of the present invention to provide a device that can perform this process efficiently and with a simple configuration.

(Means for Solving the Problems) In order to solve the problems of the above-mentioned prior art and achieve the above-mentioned objects, the present invention applies vibration to a cast product using a chipping machine, and a separate air blowing pipe. The gist is that compressed air is sprayed and supplied into the core sand of the yI manufactured product.

Then, a cast product containing core sand for carrying out the above method and having a plurality of downwardly opening sand discharge holes in the lower part is supported, and through holes that match the sand discharge holes of the cast product are vertically connected. A chipping hammer device is placed on the side of the jig plate to apply vibration to the cast product, and a chipping hammer device is placed below the jig plate to support the cast product through a through hole in the jig plate. The gist of the present invention is a sand removal device for a casting product, which is characterized by comprising a blowing device that supplies compressed air or a mixture of compressed air and abrasive material to a sand removal hole of the casting product.

(Function) - According to F, the core sand inside the cast product cracks due to vibration, and at the same time, the sand particles are blown away by compressed air, resulting in efficient destruction. The above can be realized by a device with a simple configuration.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The figure is a cutaway view of the main parts of the device for carrying out the present invention, in which there is an upper horizontal frame (2) at the top of the base frame (1) to be erected, and a φ horizontal frame (3) at the middle part. jig plates (4) are provided at the bottom of the jig plates (4) spaced apart in parallel, and on the jig plates (4) are cylinder blocks (20 ) is positioned and supported. An intermediate portion (22) for forming, for example, a water jacket space (21) within the cylinder block (20)
The core has not yet been discharged and remains, and there are multiple core discharge holes (2
3) ... is provided, and after that, a part of this is used as a drainage hole, and the other part is closed.

Above the upper horizontal frame (2) is a cylinder unit for vertical sliding)
(5), (5) are arranged, and the rod (501) of this extends vertically through the horizontal frame (2) and is suspended. Horizontal frame (2) and (
The chipping machines (6) and (6) are placed between 3), and the lot (801) of the chipping machine (6) is placed in the horizontal frame (
3) are hung down through vertically installed guide holes (30+) and (301), and a hammer (802) is provided at the lower end of the chipping machine (6) and cylinder unit) (5) and (7).
It is connected to the rod (501) by a check 7 (7), and the vertical movement of the rod (501) moves the chipping machine (6) up and down via the check 7 (7), and the cylinder block is connected via the hammer (802). (20) is given vibration.

Through holes (401) penetrating vertically are provided vertically in the portions of the jig plate (4) corresponding to the discharge holes (23) of the cylinder block (20), while the jig A support plate (10) is provided below and parallel to the plate (4). The support plate (10) is vertically provided with a pressure air jetting nozzle (11) that jets pressurized air upward in a portion corresponding to the through hole (401), and the nozzle (11) is a hose. (12)...
It is connected to a pressure air supply source (not shown) through the through hole (401
)... has a diameter that is sufficiently larger than the discharge hole (23)....

In the above, the cylinder unit (5) is driven, the loft (5 (11)) is moved up and down, and the chipping machine (6) is moved up and down via the engine (7).This causes the hammer (802) to move up and down. and cylinder blow 7ri (20)
Press and repeat this to create vibrations. Such vibrations cause cracks to occur in the core material forming the core portion (22) within the block (20). On the other hand, nozzle (II)...
Compressed air from a pressurized air supply source is blown out from the openings, and the air is blown at high pressure onto the core material through the through holes (401)... and the exhaust holes (23). The core material collapses due to the occurrence of the cracks, this is promoted, and at the same time, the core material is blown away by compressed air, which promotes the collapse and allows for efficient collapse, which improves the sand removal performance. .

It is also possible to add an abrasive material such as sand to the compressed air described above and supply a mixed fluid of the abrasive material and air. In this case, the destruction of the core sand is accelerated by the impact of the abrasive material, Sand removal is more efficient than with air alone.

A specific example will be shown.

<Example 1> An aluminum alloy casting containing core sand cast using shell core sand was positioned and set on a jig plate, and the chipping machine was operated for 60 seconds at a chipping pressure of 5 kg/crn' to generate vibrations. Gave. At the same time, the air blow pressure is 4K.
Air was ejected at g/crn' for 60 seconds while switching the nozzle as needed.

As a result, the core sand removal rate increased from the conventional 80% to 85% or more.

<Example 2> Vibration was applied under the same conditions as above, and sand was mixed as an abrasive into the compressed air under the above conditions and ejected. According to this, because the core is broken down and gouged out by the air, the sand removal time can be half the time compared to the air-only method, and the sand removal rate has improved to 98-99%. .

(Effects) As is clear from the above, according to the present invention, since compressed air is supplied from the sand discharge hole at the same time as vibration, the collapse of the core material is promoted, and this is done efficiently to improve sand discharge performance. - It improves the sand removal work efficiency and shortens the work time. Also, since the vibration applying part and the compressed air supply are separate and air is supplied from the sand removal hole, it is efficient even for cores with complex shapes. Sand removal can be carried out.

In addition, by including an abrasive material in the air together with the above air, the core material can be more efficiently disintegrated, sand removal performance can be further improved, and almost complete sand removal can be achieved. .

Furthermore, set the casting on the jig plate-L, make a through hole in the jig plate that matches the sand discharge hole, and arrange an air nozzle etc. under this.
The above can be achieved with a simple configuration of adding a chipping machine.

[Brief explanation of drawings]

1 is a partially sectional front view showing an example of a device used in the present invention; FIG. In the drawing, (4) is the jig plate, (5) and (6) are the chipping hammer device, (11) is the compressed air outlet, (2o) is the cast product, (23) is the sand discharge hole, and (401) is the Through hole, (22)
is core sand.

Claims (1)

[Scope of Claims] 1. A casting product in which vibration is applied to a casting product containing core sand using a chipping hammer device, and compressed air is jetted and supplied to the core sand of the casting product from a separate air blowing device. How to remove sand from items. 2. The method for removing sand from a cast product according to claim 1, wherein an abrasive material is mixed into the compressed air and ejected. 3. A jig plate for supporting a cast product that contains core sand and has a plurality of downwardly opening sand discharge holes at the bottom thereof, and has vertical through holes that match the sand discharge holes of the cast product. A chipping hammer device is installed above the jig plate to apply vibration to the casting, and a chipping hammer device is installed below the jig plate to supply compressed air to the sand discharge hole of the casting through the through hole in the jig plate. or a blowing device for supplying a mixture of compressed air and abrasive material.