JPS644863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technology belongs to the field of automatic exchange technology for a pair of left and right molds in a frameless molding device for casting.

Accordingly, the invention of this application forms casting sand into a predetermined shape using a pair of left and right molds, and when replacing the mold with the next mold, the release mold is taken out from the molding machine and retreated, and the next mold is placed on standby. This invention relates to a mold changing method in which a mold is advanced and set, and a changing device directly used therefor.In particular, the released mold and the next mold are temporarily placed on standby at an intermediate position, and then the released mold is The next mold is moved back to the mold and set in the molding machine at the same time.
These steps are performed simultaneously for the left and right molds, and the next time the mold is fed to the above intermediate position, the left and right molds are
This invention relates to a mold changing method which is carried out using a stock truck on which paired molds are placed as a unit and which recovers released molds, and a mold changing device which directly operates thereon.

As is well known, casting is widely used in various industries, but in mass production industries, so-called frameless continuous molding is used from the viewpoint of improving the synchronization efficiency of other lines.

However, for example, in the automobile manufacturing industry, a multi-product mass production system is used, so it is necessary to change the mold making process according to a certain program in order to synchronize with other lines.

Since frameless molding is carried out using a pair of left and right unit molds, the replacement work in the above-mentioned stage change is extremely cumbersome and inefficient.

Incidentally, there are two types of conventional unit mold replacements, one in which it is performed on one side of the molding machine and the other in both sides of the molding machine.

In the above case, a replacement handling device is usually installed on one side of the molding machine, and the machine is moved to the molding machine in an empty state.
One cycle includes the steps of clamping the release mold, releasing the clamp mold after returning, loading the mold next time, clamping it, putting it into the molding machine, unclamping it, and returning to the initial position in an empty state. Therefore, the process is extremely cumbersome, it takes a lot of time for changeovers, and automation is complicated.

On the other hand, in the latter case, embossing devices are installed on both sides of the molding machine, and the next mold is pushed in from one side, which pushes out the mold inside the molding machine and further pulls out the extruded release mold. However, the work of replacing the molds was also complicated, and it was difficult to replace the molds on three or more sides by replacing two sides alternately.

The purpose of the invention of this application is to solve the problem of exchanging molds of a frameless molding machine based on the above-mentioned prior art, and to solve the problem of exchanging molds on the left and right sides of a molding machine independently and simultaneously. It is an excellent product that benefits the field of mold making in the machinery and equipment industry by making it possible to perform replacement work quickly, shortening the downtime of the molding machine, and integrating it with the stock section to enable molding and mold replacement as a total system. The purpose is to provide a mold replacement method and a device that can be used directly.

The structure of the invention of this application in accordance with the above-mentioned object is that a predetermined frameless mold is continuously formed by left and right molds set in a molding machine, and when changing the mold by changing the mold at a set timing, the mold is Release and pull out the left and right molds through the left and right die bases of the machine,
Each of the release molds is retracted onto the intermediate truck through a retracting extruder, and then the intermediate truck is placed alongside the release mold on which the next mold has been previously placed by the delivery device of the stock truck, and then the intermediate truck is placed alongside the release mold. The left and right intermediate carts are brought together, and the release mold is placed in the retreat position and the next mold is placed in the advance position.
The next mold is returned as a pair of unit molds, and at the same time, the next mold is advanced into the molding machine by the advancing machine, placed on the die base, and set in the molding machine. The main point is that the next mold is sent from the stock truck onto the intermediate truck, and technical measures have been taken to enable accurate and efficient mold exchange during the short molding machine stop time. be.

Next, embodiments of the invention of this application will be described below with reference to the drawings.

In the illustrated embodiment, the molding machine 1 and the stock truck 2 are one.
This is a line-shaped system plant, and the molding machine 1 is used for continuous molding of frameless vertical molds, and left and right molds 4 and 4' are installed on the left and right sides of the molding chamber 3. The guide bars 6, 6,
The die bases 7 and 7' which slide into the die bases 7 and 6 are set and released.

Extrusion cylinders 8, 8', which serve as retracting extruders, are erected on the base 10 by stands 9, facing the molds 4, 4' when the die bases 7, 7' are in the open position.

On the other hand, between the molding machine 1 and the stock truck 2, a pair of left and right intermediate trucks 11, 11' for left and right molds 4, 4' are provided on rails (not shown) via wheels 12, 12... Hydraulic cylinders 14, 14' are used to move the frame 13 toward and away from the frame 13.
Mounting frame 15, 15, 15', 1 for 2'
5' is installed upright.

For the left and right intermediate carts 11, 11', advancing cylinders 16, 1 as advancing machines are oriented coaxially with the pushing cylinders 8, 8'.
6' has pushers 17, 17' at its tips and is erected on the base 10 with a stand similar to the above.

Moreover, the stock truck 2 is one unit, and rail wheels 18 (not shown) are mounted parallel to the rails of the intermediate truck.
The left and right molds 4, 4' are mounted and stocked as one unit on multi-sided erecting frames 20, 20.

Further, for the stock truck 2, a pair of left and right delivery cylinders 21, 21' as a sending device are erected on the base 10 via a stand with pushers 22, 22' at their tips. The upper unit molds 4, 4' are attached to the frames 15, 1 near the hydraulic cylinders 14, 14' of the intermediate carriages 11, 11'.
5'.

Furthermore, a return cylinder 23 as a reversing machine that overhangs the stock truck 2 and traverses the intermediate truck 1 has a hook 24 at its tip.
It is provided on the base 10 by means of a stand so as to extend from the center of the parts 1 and 11'.

During the exchanging movement of the left and right molds 4, 4' by the above-mentioned mechanisms, the guide rails 25 are used to ensure that the molds 4, 4' are maintained in a standing position and are not tilted or collapsed during the movement and stop of the molds 4, 4'. As shown in detail in FIG. 4, the frames 15, 15', 20 have C-channel grooves.
It is fixed to the die bases 7, 7', and is erected on the base 10 via stands between the die bases 7, 7' and the intermediate trucks 11, 11', and between the intermediate trucks 11, 11' and the stock truck 2. It is provided.

Furthermore, as shown in FIG. 4, a hook 26 having a T-shaped cross section is attached to the back surface of each mold 4, 4' to be hooked to the C channel groove guide rail 25. .

In the mold changing device configured as described above, 1
In the process of continuously manufacturing flaskless molds with a pair of left and right molds 4, 4' using a molding machine, when the setting program reaches the stage of manufacturing a mold according to the next design, the molding machine 1 is activated via a control device (not shown). The squeeze cylinders 5 and 5' are simultaneously opened to the release position, and the extrusion cylinders 8 and 8' are simultaneously extended by the limit switch, releasing the molds 4 and 4 of the die bases 7 and 7'.
4' is pushed out and transferred via the guide rail 25 to the frames 15, 15' at positions A and A' of the intermediate carts 11, 11' waiting in a solid line state, and the release mold 41,
41', the extrusion cylinders 8, 8' move back a little and stop.

In this case, as described later, the intermediate trolley 11,
Next time, molds 42, 42' will be advanced to positions C, C' of hydraulic cylinders 14, 11', and frame 1 will be moved.
5, 15'.

When the release molds 4, 4' are transferred to the intermediate carriages 11, 11' in this way, the hydraulic cylinders 14, 14' are controlled by the control device via the limit switch.
expands and brings the intermediate carriages 11, 11' close to the dotted line state in Figures 1 and 2, and the release molds 41, 41, at positions A and A'
The molds 41' are laterally moved to the retracted position of the positions B and B', and next time the molds 42 and 42' are laterally moved from the positions C and C' to the advanced positions B and B'.

Then, the return cylinder 23 and the left and right advancing cylinders 16, 16' are operated simultaneously by the operation of the limit switch via the control device, the former is contracted, the latter is extended, and the intermediate bogies 11, 11' are
The release molds 41, 41' in the retracted position B' are guided by the guide rails 25, 25 and are returned to the frames 20, 20 on the stock truck 2 without overturning.

In this case, the stock truck 2 is driven by a reversible motor 19.
Set the reinstatement position by moving it left and right.

On the other hand, the next molds 42, 42', which are laterally moved to positions A, A' on the intermediate carts 11, 11' by the advancing cylinders 16, 16' and are waiting, are advanced and passed through the guide rails 25, 25' to the die base. 7, 7', but as mentioned above, the extrusion cylinders 8, 8' are waiting in an almost extended position,
Since the hydraulic circuit design generates back pressure in the extrusion cylinders 8, 8', the next time the molds 42, 42' will not overrun even if the advance cylinders 16, 16' advance strongly. The die bases 7, 7' are controlled to stand still in a set posture.

Then, the extrusion cylinders 8, 8', extrusion cylinders 16, 16', and return cylinder 23 are returned by the limit switch via the control device, and
Intermediate truck 11, by hydraulic cylinders 14, 14'
11' is separated, and the squeeze cylinders 5, 5' advance to set the next molds 42, 42' in the molding chamber 3.
Continuous molding using a frameless mold.

During that time, the reversible motor 19 operates according to the program, and the stock truck 2 moves left and right to move the left and right molds 4, 4' for the next set one after another in front of the delivery cylinders 21, 21'. put.

That is, first, the left side mold 4 is moved to the left side delivery cylinder 2.
1, the left intermediate carriage 11 is set at position C via the guide rail 25 by the extension of the left delivery cylinder 21 by the limit switch.

Next, the stock truck moves to the right in the figure to set the right mold 4' in front of the right delivery cylinder 21', and as the right delivery cylinder 21' expands, the right intermediate truck 11' is moved to the C' position. frame 5'.

In this way, one mold exchange completes one cycle, and therefore, the stop time of the molding machine 1 is limited to the separation of the die bases 7, 7' and the intermediate carriage 1 of the released molds 4, 4'.
1, 11', lateral movement of the intermediate carriages 11, 11', advancement of the advance cylinders 16, 16', and reset of the die bases 7, 7', which is extremely short, and according to experiments, takes 10 seconds. That's about it.

It goes without saying that the embodiments of the invention of this application are not limited to the above-described embodiments; for example, various embodiments can be adopted, such as using a rack-and-pinion advance/retreat bar mechanism in place of each cylinder.

As mentioned above, according to the invention of this application, the mold can be replaced in an extremely short time, and therefore the molding machine only needs to stop molding in a short time, which is an excellent method that significantly improves the molding efficiency. The effect is produced.

In addition, since the release mold and the next mold are automatically exchanged synchronously on both sides within a certain period of time, not only is the exchange work more efficient, but the exchange time can be known in advance, making it easier to plan the work. It also has the advantage of being able to be erected accurately.

Furthermore, since the modeling device and the stock section of the stock truck are directly connected to each other in the plant, the facility becomes compact, which also has the effect of improving work efficiency.

Therefore, the release mold from the molding machine and the next mold are placed side by side on an intermediate trolley, and both are moved to the retreat position and the advance position at the same time, thereby making it possible to perform the above exchange. An excellent effect is produced that greatly contributes to shortening the stroke.

In addition, since the retraction of the next release mold and the advance of the next mold are performed simultaneously, the retraction of the release mold to the stock truck and the setting of the next mold to the molding machine take up a large amount of release compared to the exchange. By allowing retreat and advance setting to be carried out simultaneously, the effect of significantly shortening time and improving efficiency can be achieved.

The exchange device also has an intermediate truck that moves close to and separates from the left and right between the molding machine and the stock truck, and the intermediate truck is equipped with a backward extruder from the molding machine and a feeder from the stock truck. By moving the intermediate truck laterally, not only can the releasing mold be moved back relative to the intermediate truck and the next mold can be advanced from the stock truck, but also a retracting machine is provided from the intermediate truck to the stock truck. This has the advantage that the release mold can be retracted into the stock truck and the mold can be advanced and set into the molding machine for the next time at the same time.

In this way, the process of exchanging the release mold and the next mold can be carried out almost simultaneously and symmetrically, which has an excellent effect of reducing time.

Furthermore, the left and right molds are paired to form a unit on the stock truck, and by mounting a large number of these units, it is possible to send the desired amount to the intermediate truck only by controlling the lateral movement. Automatic mold exchange becomes possible, which also has the effect of greatly reducing the need for mounting and removing molds in the stock section.

Another advantage is that unmanned operation is possible even when many types of work are in progress.

[Brief explanation of drawings]

The drawings are explanatory diagrams of one embodiment of the invention of this application, in which FIG. 1 is an overall schematic plan view, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a longitudinal sectional view of FIG.
FIG. 4 is an enlarged cross-sectional view of section A in FIG. 2, and FIG. 5 is a cross-sectional view of FIG. 1. 1...Molding machine, 4,4'...Mold, 42,4
2'...Next mold, 41,41'...Release mold,
B, B'...Retreat position, A, A'...Advance position, 1
1, 11'...Intermediate trolley, 2...Stock trolley,
3... Molding chamber, 8, 8'... Backward extruder, 23...
...Backward return machine, 16,16'...Advance machine, 21,
21'...Sending machine.

Claims (1)

[Scope of Claims] 1. In an exchange method in which a pair of left and right molds released from a molding machine are simultaneously replaced with a next mold after the release mold is released, and the next mold is set, the release mold is set. After releasing the mold, the process of placing it in the retracted position and the process of placing the next mold in the advanced position are performed together, and then the releasing mold is retracted and the next mold is advanced to the set position, and then these steps are performed. A method for exchanging molds, characterized in that the process is performed simultaneously for each pair of left and right molds, and then the next mold is sent out to the advance position. 2 In a device that is directly used for the method of simultaneously exchanging a pair of left and right molds for a molding machine with the next mold, a pair of intermediate carts for the left and right molds are installed at the rear of the molding machine so that they can approach and separate from each other; A stock truck on which a pair of left and right mold units is mounted is installed so as to be movable in the left and right direction, and a pair of backward extruders are installed on the left and right sides of the molding chamber, and In the center thereof, there is provided a reversing machine for the stock truck, and an advancing machine is provided opposite to the retracting extruder, and the stock truck is further provided with a pair of sending machines for the left and right intermediate trucks. A mold changing device is featured in that it is also installed.