JPS61235042A - Molding device for shell mold for casting - Google Patents

Abstract

PURPOSE:To reduce an operation for molding and metallic mold exchange by providing in series stations for dump molding, calcining and shell mold taking out in this order and disposing a metallic mold exchange carriage in such a manner that said carriage can move in the direction orthogonal with the station direction. CONSTITUTION:The metallic mold 30 having a prescribed shape is imposed on a metallic mold transfer carriage 23 on a metallic mold exchange carriage 18 in a metallic mold loading station. The metallic mold is transferred to a shell mold taking out station 3. Then the carriage 18 is positioned to the station 3 and a rail part 20b on the carriage 18 is aligned to the other part. A shutter 16a of a heating furnace 12 is opened in this state and a carriage transfer conveyor 22 is driven. The conveyor 22 stops and the shutter 16a is closed when the carriage 23 is transferred into the furnace 12. The metallic 30 is preheated by burners 15 and when the mold is heated to the prescribed temp., the shutter 16b is opened and the conveyor 22 is driven. The shell sand drops onto the mold 3 and a green sand mold is formed when the carriage 23 is transferred into a dump molding station 2. The mold imposed on the carriage 23 is calcined in this state in the furnace 12 and is removed from the mold 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shell mold manufacturing apparatus using a dump molding method.

[Prior art]

Generally, when casting is performed using the shell mold method, a shell mold is first molded by the dump method or the blow method. Some had a shell mold removal station in between.

When making a shell mold using this conventional equipment, the mold is first preheated in a firing station, then transferred to a dump molding station via a shell mold removal station, where shell sand is adhered onto the mold, and then Then, the shell mold is transferred again to the firing station via the shell mold take-out station, and after being fired at the station, it is returned to the shell mold take-out station, where the shell mold is taken out. Furthermore, when replacing molds, the molds on the mold exchange trolleys located outside each of the above stations and the molds on the shell mold removal station are manually replaced using a crane or the like. Ta.

In this way, with conventional shell mold making equipment, when making a mold, it is necessary to go back and forth between the above stations many times, resulting in a lot of time loss, and when changing molds, it is necessary to go back and forth between the mold changing cart and the shell mold take-out station. The longer the distance between the two, the more time is lost, and this conventional device has the problem of poor workability and low work efficiency.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems.
It is an object of the present invention to provide a shell mold making device that can reduce both the time loss during shell mold manufacturing and the time loss when changing molds, and improve the efficiency of shell mold manufacturing work.

[Structure of the invention]

The present invention provides a shell mold making device in which three stations, dump molding, firing, and shell mold removal, are arranged in series in this order, and a rail for a mold transfer trolley arranged along these stations is used. A mold transfer trolley is placed on the rail, and a mold exchange trolley is provided so as to be movable in a direction perpendicular to the rails at the shell mold takeout station, and an eject mechanism is provided on the trolley, and the shell mold takeout station of the rail is provided with an eject mechanism. This part is separated from other parts and placed on the mold exchange trolley.

As a result, in the present invention, in the production of the shell mold,
The mold is preheated at the firing station and transferred to the adjacent dump molding station, where the shell sand is attached and then returned to the firing station where it is fired.
Next, the shell mold is transferred to the adjacent shell mold take-out station, where the shell mold is taken out, and during mold exchange, the entire mold exchange cart is replaced at the shell mold take-out station, and every time the mold moves one station. to 1
time is almost eliminated.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention. In the figures, 1 is a dump making station, 2 is a firing station, and 3 is a shell mold removal station. These three stations 1.2°3 are They are arranged in series in this order.

A support pedestal 5 for a dump molding machine 4 is erected in the dump molding station 1, and a dump molding box 6 is rotatably supported on the support pedestal 5 by a support shaft 6a. A drive motor 7 is installed at the bottom of the support frame 5.
is attached, and a drive sprocket 7a fixed to the motor 7 and a driven sprocket 6b fixed to the support shaft 6a are connected by a chino 8, whereby the dump molding box 6 can be rotationally driven. It is composed of

Further, a hopper 9 is formed at the upper end of the dump molding box 6 for supplying shell sand thereto, and a shutter 10 is further provided below the hopper 9 to partition the inside of the dump molding box 6 into upper and lower parts. , are disposed in the box 6 so as to be freely retractable. Further, a piston rod of an opening/closing cylinder 11 is connected to the drive arm 10a of the shutter 10, and the cylinder 11 is connected to the dump molding box 6.
is attached to.

At the baking station 2, a support frame 13 for the heating furnace 12 is provided.
The heating furnace main body 14 disposed on the supporting frame 13 has a substantially cubic shape with a peripheral wall made of a heat insulating material, and burners 15 are installed inside the top and bottom walls of the heating furnace main body 14. Openings 14a, 14b are formed in the side walls, and shutters 16a, 16b for opening and closing the openings 14a, 14b are vertically movable.

On the floor of the shell mold take-out station 3, rails 17 for mold exchange carts are installed at the three stations 1 to 3.
The upper and lower portions of the rail 17 in FIG. 1 serve as mold loading stations 26.
It's now 27.

A mold exchange cart 18 is placed on the rail 17 so as to be movable on the rail 17, and above the mold exchange cart 18 in FIG. 28 is placed. And this mold exchange trolley 18
．． 28, an eject cylinder 19a is attached in the vertical direction, and the piston rod of the cylinder 19a is fixed to the eject plate 19b.
The guide loft 19c of b is slidably inserted into a guide member 19d fixed to the mold exchange cart 18.28, and these constitute an eject mechanism 19 for ejecting the molded shell mold. ing. Sho 25a
is a coupler inserted into the air supply passage 25 for supplying air to the eject cylinder 19a.

Further, a cart positioning device 24 is disposed below the shell mold take-out station 3, and this is for positioning the mold exchange cart 18 or 28 at the shell mold take-out station 3. A positioning cylinder 24a attached to the support frame 13 of No. 12, and a gripping claw 24b connected to the piston rod of the cylinder 24a for gripping an engaging member 18b formed on the mold exchange cart 18 or 28. It is configured.

Two mold transfer trolley rails 20 are arranged along the three stations 1 to 3, and the rails 20 are arranged along the three stations 1 to 3.
The portion 20a between the support frames 5 and the shell mold take-out station 3 portion 20b of the dump molding machine 4 of No. 0 are separated from other portions.

The portion 20a between the support frames 5 is fixed to the rail support portion 21a of the bogie vertical movement cylinder 21 attached to the dump molding box 6, and the shell mold takeout station 3 portion 20b is connected to the mold exchange carts 18 and 28.
fixed on top.

Also, the firing station 2 of the rail 20. A cart transfer conveyor 22 is disposed on the side of the dump building station 3, and the cart transfer conveyor 22 has a sprocket 22a provided at the left end of the baking station 2 and at the right end of the dump building station 1. , a chino 22b wound between both sprockets 22a, and a drive motor (not shown) that rotationally drives the sprocket 22a.
It is composed of.

A mold transfer carriage 23 is placed on the rail 20 so as to be movable in the direction of the rail 20.

The mold transfer cart 23 has the eject plate 19b.
A large number of eject pins 23d are inserted into the carriage 23 so as to be able to move up and down, and a hook 23a is formed on the trolley 23, and the striker 2 with which the hook 23a engages
3b is connected to the chino 22b of the bogie transfer conveyor 22 by an attachment 23c.

Next, the effects will be explained.

When molding a shell mold using the apparatus of this embodiment, the first
As shown by the dashed line in the figure, the mold loading station 27
A mold 30 of a predetermined shape is placed on the mold transfer trolley 23 on the mold exchange trolley 18, and the mold exchange trolley 18 is moved to the shell mold removal station 3, as shown by the solid line in the same figure.
Transfer to.

Then, the positioning cylinder 24 of the truck positioning device 24
a extends and the gripping claw 24b grips the engagement member 18b,
As a result, the mold exchange trolley 18 is positioned at the shell mold removal station 3, and the mold transfer trolley 2 is positioned at the shell mold removal station 3.
As the hook 23a of No. 3 engages with the striker 23b, the rail portion 20b on the mold exchange cart 18 becomes in line with the other portions. After this, the air supply passage 25 is connected.

In this state, the shaft 16a of the heating furnace 12 is opened, the carriage transfer conveyor 22 is driven, and the mold transfer carriage 23 is driven.
After being transferred into the heating furnace 12, the conveyor 22 is stopped and the shutter 16a is closed. Then, the mold 30 is preheated by the burner 15 of the heating furnace 12, and when it reaches a predetermined temperature, the shutter 16b is opened and the cart transfer conveyor 22 is driven again.

When the mold transfer cart 23 is transferred to the dump molding station 1, the cart transfer conveyor 22 stops and the cart vertical movement cylinder 21 contracts, whereby the mold transfer cart 23 rises together with the rail 20a. It comes into contact with the lower end opening of the dump molding box 6. Then, the shutter 10 of the dump molding box 6 is opened, and the shell sand falls onto the mold 30, and the surface portion of the shell sand on the mold 30 is melted by the heat of the cough mold 30 and adheres to the surface. Then, the drive motor 7 is started and the dump molding box 6 is turned upside down as shown in FIG. Then, the dump molding box 6 is turned over again, and the bogie vertical movement cylinder 21 is extended to move to the second position.
Returning to the state shown in the figure, a green mold is formed on the mold 30.

When the green mold is formed, the shaft 16b is opened, the carriage transfer conveyor 22 is driven in the opposite direction, and the mold transfer carriage 23 is transferred into the heating furnace 12. The green mold on the mold transfer carriage 23 is heated to a predetermined temperature by the burner 15 and fired into a shell mold.

When the above firing operation is completed, the mold transfer cart 23 is transferred onto the mold exchange cart 18 by the cart transfer conveyor 22.

Then, the eject cylinder 19a is extended and the eject plate 19b pushes up the eject bin 23d, whereby the shell mold is removed from the mold 30, and in this way, shell molds are continuously molded.

When a shell mold different from the above is to be molded, the mold 30 is first replaced with a mold 31 corresponding to the shell mold to be molded.For this purpose, the mold exchange cart 1B is loaded. The mold exchange cart 28 loaded with the replacement mold 31 and waiting at the loading station 26 is transferred to the shell mold removal station 3, and then the above-described procedure is carried out. Model.

As described above, in this embodiment, the dump molding station 1.
Baking station 2. Since the shell mold removal stations 3 and 3 are arranged in series in this order, one operation can be performed each time the molds 30 and 31 are moved one station, eliminating loss time and shortening the molding cycle. Since the mold exchange trolley is movable in the direction orthogonal to the station direction, when replacing the mold, the entire mold exchange trolley can be replaced, which shortens the mold exchange cycle and reduces the work involved in making shell molds. can improve efficiency.

In the above embodiment, the structure was explained in which the dump molding machine 4 section 20a of the rail 20 was divided from other parts and the rail 20a was turned over, but the structure of the dump molding machine 4 section is as follows However, the present invention is not limited to this, and it is not necessarily necessary to divide the rail 202 portion.

〔Effect of the invention〕

As described above, according to the shell mold manufacturing apparatus according to the present invention, the dump molding station, the firing station, and the shell mold removal station are provided in series in this order,
Since the mold changing cart is disposed so as to be movable in a direction perpendicular to the station direction, both the molding cycle and the mold changing cycle can be shortened at the same time, which has the effect of greatly improving the efficiency of shell mold manufacturing work.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a shell mold manufacturing apparatus according to an embodiment of the present invention, and FIG. 2 is a side view thereof. DESCRIPTION OF SYMBOLS 1... Dump molding station, 2... Baking station, 3... Shell mold removal station, 1st day, 28... Mold exchange trolley, 19... Eject mechanism, 20... Rail, 20b ... Mold exchange trolley part of the rail, 23... Mold transfer trolley, 30.31... Mold.

Claims (1)

[Claims] (1) A dump molding station, a firing station, and a shell mold removal station are arranged in series in this order, and a mold transfer cart is mounted on a rail provided along these three stations so as to be movable in the direction of the rail. and a mold exchange trolley is provided movably in a direction perpendicular to the rail at the shell mold removal station,
The shell mold take-out station part of the mold transfer trolley rail is separated from other parts and installed on the mold exchange trolley, and the mold exchange trolley is used to take out the molded shell mold from the mold. A shell mold making device characterized by being provided with an eject mechanism for.