JP3317485B2 - Core removal equipment for castings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing sand from a casting, and more particularly to an apparatus for removing cores.

[0002]

2. Description of the Related Art In an aluminum casting such as an engine cylinder block, a method of hitting a workpiece with an air hammer is generally used to remove a core after casting. However, a piston cooling jacket portion of a cylinder block is thin. Due to the depth, the core sand from the work is poor in sand removal, and the work is hit hard to discharge sand.

A method of discharging core sand by shot blasting with sand and compressed air is also known (Japanese Utility Model Application Laid-Open No.
49359).

[0004]

However, the hitting method has a problem that the workpiece is broken by the hitting. In addition, the method using shot blast has a problem that, in the case of an aluminum casting, the product is damaged by the projection sand.

Accordingly, the present invention is to provide a casting core removing device which can efficiently remove core sand without damaging the work.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a core removing device for a casting, wherein a nozzle header having a plurality of air blow nozzles arranged in a row is rotatably provided on a nozzle header supporting plate via an elastic support. The nozzle header support plate is provided on a movable frame via an air header, and the movable frame is supported by a damper unit having an elastic body. The movable frame can be provided with a vibrator.

[0007]

FIG. 1 is a perspective view of a nozzle header portion of a casting core removing device of the present invention, FIG. 2 is a front view,
FIG. 3 is a side view.

The plurality of air blow nozzles 1 are connected to the plugs 3 of the nozzle header 2 and are arranged in one row. In accordance with the number of holes formed in the casting by the core sand, all or a plurality of air blow nozzles 1 are provided. If the holes are formed in parallel, a plurality of air blow nozzle rows are provided.

Both ends of the nozzle header 2 are provided with bearings 5 of a nozzle header support plate 4 disposed below the nozzle header 2.
a, 5b, so that the nozzle header 2 is rotatable, that is, the air blow nozzle 1 is rotatable. The nozzle header 2 is provided with an air supply port 6 for supplying air from the center of one bearing 5a.

An elastic support 7 is provided between the nozzle header 2 and the nozzle header support plate 4. The elastic support 7 is fixed to the nozzle header 2 by an elastic support mounting plate 8, and the air blow nozzle 1 is elastically mounted. It is supported on the nozzle header support plate 4 via the support 7. For example, a vibration-proof rubber is used for the elastic support 7.

Nozzle header support plate 4 and movable frame 9
Between them, an air header 10 for supplying air to the nozzle header 2 is provided. The air header 10 is provided with an air supply port 11.

The movable frame 9 is provided with a vibrator 12 for vibrating the nozzle header 2. The movable frame 9 is supported by a fixed frame 13 of the apparatus main body by a damper unit 14 having elasticity such as a vibration-proof rubber.

The damper unit 14 includes the movable frame 9
An elastic body 16 fitted to a bolt 15 between the frame and the fixed frame 13 is held by a collar 17 to support the movable frame 9 outside the elastic body 16. The damper unit 14 is provided with a gap from the fixed frame 13, projects the upper end of the collar 17 on the movable frame 9 side from the surface of the movable frame 9, and connects the movable frame 9 to the head (or nut) of the bolt 15. A gap 18 is formed therebetween, and the elastic body 16 is supported and fixed with a gap between the elastic frame 16 and the fixed frame 13 so that the movable frame 9 is elastically supported.

The operation of the cylinder block gripped by the robot according to the present invention will be described.

In order to remove the core sand of the water jacket of the cylinder block held by the robot, the nozzle is inserted into the water hole of the water jacket while blowing air from the air blow nozzle 1.

On the other hand, the positioning error of the water hole caused by forming the water jacket with the divided cores, the misalignment of the robot due to the casting error of the work, and the error of the trajectory teaching of the nozzle insertion into the thin and long water jacket hole. For example, when a large number of air blow nozzles 1 are inserted into the water jacket holes, even if the tip of the air blow nozzles 1 comes into contact with the wall surface of the water jacket, the air blow nozzles 1 can rotate the bearings 5a and 5b. Further, since the air flow nozzle 1 is supported by the floating structure including the elastic support member 7, the air flow nozzle 1 escapes and can be inserted to a predetermined depth of the water jacket hole, and the air blow nozzle 1 does not break.

When the air blow nozzle 1 is vibrated by the vibrator 12 at the same time as the air is blown, the core is cracked and sand is blown out by air blow. It can easily move forward to remove core.

The vibration of the vibrator 12 is absorbed by the damper unit 14 and does not affect the device.

[0019]

The effects of the present invention are as follows.

(1) When inserting a plurality of air nozzles arranged linearly in one row, the nozzle tip and the hole can be swung in the axial direction in the arrangement direction with respect to the hole position of the casting and the nozzle position error. Even if wall contact occurs, the nozzle escapes and breakage of the nozzle can be prevented.

(3) Sanding can be performed by inserting a plurality of nozzles into the holes, so that the processing time can be reduced.

(2) Since the nozzle vibrates to break the core, the insertion load is light, the work can be performed smoothly, and the nozzle is less worn. When inserting an air blow nozzle into a thin and deep core, for example, the core of a water jacket for cooling a piston, in the case of aluminum, the core is hard and the nozzle is difficult to enter deeply due to the low melting temperature. Although the abrasion is fast, the present invention vibrates the air blow nozzle with a vibrator to break the core and sand out, so that the insertion load is light and the abrasion of the nozzle is reduced. In addition, since the air blow improves the sand discharging property, there is little residual sand in complicated passages and corners, there is no scattering of sand in a later process, and the working environment is improved.

(3) Since the robot is gripping the work, air can be blown into a plurality of jacket openings of the work.

(4) There is no need to apply a high impact to the work as in the prior art, so there is no fear of the work breaking.

[Brief description of the drawings]

FIG. 1 is a perspective view of a nozzle header portion of an apparatus for removing a core of a casting according to the present invention.

FIG. 2 is a partially cutaway vertical longitudinal sectional view of a core removing device for a casting according to the present invention.

FIG. 3 is a side longitudinal sectional view of a core removing device of a casting according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air blow nozzle 2 Nozzle header 3 Plug 4 Nozzle header support plate 5a, 5b Bearing 6 Air supply port 7 Elastic support 8 Elastic support attachment plate 9 Movable frame 10 Air header 11 Air supply port 12 Vibrator 13 Fixed frame 14 Damper unit 15 bolt 16 elastic body 17 collar 18 gap

Continuation of the front page (56) References JP-A-9-164471 (JP, A) JP-A-9-19758 (JP, A) JP-A-7-308751 (JP, A) JP-A 8-132221 (JP) JP-A-4-367366 (JP, A) JP-A-1-91957 (JP, A) JP-A-59-30365 (JP, U) JP-A-60-56160 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B22D 29/00 B22D 29/02 F02F 1/00

Claims (2)

(57) [Claims] 1. A nozzle header in which a plurality of air blow nozzles are arranged in a row is provided on a nozzle header support plate rotatably and via an elastic support, and the nozzle header support plate is provided on a movable frame via an air header. And a movable frame is supported by a damper unit having an elastic body. 2. The casting core removing device according to claim 1, wherein the movable frame has a vibrator.