JPH0116231B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for changing a model in a mold making machine, and more specifically, the present invention relates to a method for changing a model in a mold making machine, and more specifically, a model for an upper mold installed on a joint table for mold making, and an upper mold installed in a squeeze device. Concerning the method for replacing each road model with a new model.

When molding a large mold such as a cylinder block for a vehicle engine, or when molding multiple molds in one flask, an upper runner (for pouring molten metal into each sprue) is placed on the top of the upper mold. It is common to form an I-shaped, H-shaped, or cross-shaped groove for distribution, and the upper runner model for forming this upper runner during mold making is usually used as a squeeze head of a squeeze device. installed on. When the upper mold model is replaced with a new one with a different shape, the upper mold model is usually replaced with a model corresponding to the new upper mold model. Conventionally, although the replacement of the upper mold model was mechanized, the replacement work of the upper runner model was done manually, resulting in long downtimes in the molding work associated with model replacement. This is one of the factors that reduces the production rate, and the upper runner model itself has a considerable weight.
Therefore, it is extremely troublesome and dangerous to attach and detach this to and from the squeeze head under poor working conditions.

In view of the above-mentioned conventional problems, an object of the present invention is to provide a model exchange method in a mold making machine that allows mechanically and rationally converting two types of models: an upper mold model and an upper runner model. Our goal is to provide the following.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments. The mold making machine includes a joint device 1 which includes a joint cylinder, a joint valve, a squeeze cylinder, a lift cylinder, etc., and a rail 3 that is horizontally suspended on a frame 2 above the joint device 1 so as to be movable laterally. The molding sand charging device 4 and the squeezing device 5 are arranged in parallel with the molding sand charging device 4 and are movable together with the molding sand charging device 4.
It is adapted to be repositioned by a fluid pressure cylinder (not shown) between a working position directly above the joint device 1 and a standby position separated from the joint device 1 according to the molding work process.

For example, a shaped upper runner model 10 is fixed to the lower surface of the squeeze plate 9 fixed to the squeeze head 8 of the squeeze device 5 via clamp devices 11. 2 formed symmetrically to
They are arranged in two recesses 9a, respectively. That is, as shown in FIGS. 3 and 4, a double piston type clamp cylinder 12 which is a driving part of each clamp device 11 is fixed laterally to the lower surface of the squeeze head 8, and this clamp cylinder 12
Piston rod 14 of piston 13 sliding inside
are each extended outward. A female-shaped engagement member 15 is attached to the tip of each piston rod 14 so as to be allowed to be slightly displaced in the vertical direction.
The occlusal member 15 has an occlusal surface 15a whose upper and lower front surfaces protrude forward, and the inner surface of the protruding portion is tapered. Note that 16 and 17 are channels for supplying and discharging pressure fluid to and from the clamp cylinder 12. Moreover, the male-shaped occlusal member 18 that can engage with the female-shaped occlusal member 15 has two occlusal claws 18a,
18b, one of the engaging claws 18a is fixed to the squeeze head 8 with a bolt 19a, and the other engaging claw 18b is fixed to the upper surface of the upper runner model 10 with a bolt 1.
9b, and the occlusal claws 18a,
The outside of 18b is the occlusal surface 1 of the female occlusal member 15.
It is formed into a taper corresponding to 5a. Therefore, the clamp cylinder 12 is connected to the piston rod 14.
When operated so as to protrude, the female-shaped bite member 15 bites into the male-type bite member 18, and the upper runner model 10 is fixed to the squeeze head 8 in a double-protrusion manner. Note that 20 is a dowel pin provided on the lower surface of the squeeze plate 9, and 21 is a dowel hole provided on the upper runner model 10. Furthermore, a model support 7 on which an upper mold model is set is placed on the joint table 6 of the joint device 1, and the fixing of the model support 7 to the joint table 6 is not shown. This is done by a clamp device similar to the clamp device 11 for the upper runner model 10 described above.

Next, a model exchange device will be explained with reference to FIGS. 1 and 2. The two feed bars 22 each having four pins 22a for transferring the model on their upper portions extend horizontally and parallel to each other in close proximity to both sides of the joint device 1. That is, roller conveyors 23 and 24 for carrying in the model and carrying out the model are disposed on both sides of the joint device 1 in the longitudinal direction of the feed bar 22, and both roller conveyors 2
3 and 24 are set so that the conveying direction thereof is perpendicular to the longitudinal direction of the feed bar 22, and the height of the conveying surface is approximately the same as the upper surface of the joint table 6. The two feed bars 22 are connected to at least the joint table 6 and one roller conveyor 23.
Support rollers 2 with flanges are attached to the upper ends of an appropriate number of swing links 25 (four for one feed bar in this example) arranged below the roller conveyors 23 and 24.
6 so as to be movable in the longitudinal direction. The swing links 25 are swingably supported by the frame 2 at appropriate intervals, and their lower ends are connected to each other by interlocking rods 27, and one end of the interlocking rods 27 is supported by the frame 2. It is connected to the piston rod 29 of the lift cylinder 28 via a connecting member 27a. That is,
The feed bar 22 is raised and lowered via the swing link 25 by the operation of the lift cylinder 28, and the model transfer pin 22a provided on the feed bar 22 is connected to the roller conveyors 23 and 24 in the lowered state. Pin receiving portions 7a or upper runners, which will be described later, are located below the conveyance surface and the upper surface of the joint table 6, but protrude above them when rising, and are provided on both sides of the model support 7. A pin receiving portion 36a protruding from a model support stand 33 for a model is received. Further, one ends of both feed bars 22 are connected to each other by a connecting member 30, and a piston rod 32 of a feed cylinder 31 supported by the frame 2 is connected to this connecting member 30.
are connected via elongated holes to allow vertical movement of the connecting member 30.

Next, the fifth section regarding the model support stand used as a cradle for transporting the upper runner model 10 when exchanging the model.
This will be explained with reference to the figures and FIG. The model support stand 33 includes a base plate 34 having approximately the same size as the model support body 7, side plates 35 erected to face both sides of the base plate 34, and a base plate 34 arranged between the side plates 35.
The concave support plate 36 forms a substantially box-like shape with an open upper part, and a support base plate 37 is horizontally fixed to the upper surface of the concave portion of the concave support plate 36. Support base plate 3
A model receiving plate 38 for supporting the upper runner model 10 is disposed above the model receiving plate 3 .
8 is vertically movably supported by the support plate 37 via four support rods 39, and
An upward biasing force is applied by a coil spring 40 that is loosely fitted in the coil spring 9. That is, the model receiving plate 38 is elastically supported, and the spring force is set so that the upper surface of the upper runner model 10 is slightly higher than the upper end surface of the side plate 35 when the upper runner model 10 is received. Further, an appropriate number of support plates 41 with rubber pads are attached to the upper surface of the model receiving plate 38 to support the upper runner model 10 from the front, rear, left and right directions, and the mounting positions of the support plates 41 and The number is determined according to the shape of the upper runner model 10.
A pin receiving portion 36a corresponding to the model transfer pin 22a on the feed bar 22 is protruded from the lower portion of the outer surface of the outer concave support plate 36.

Next, the model exchange function in the mold making machine configured as described above will be explained.

As a preparatory work for replacing the model, the squeeze device 5 is first moved to a position directly above the joint device 1,
On the other hand, on the carrying-in roller conveyor 23, an empty model support 33, a model support 33' that has received, for example, a new upper runner model 10' to be replaced, and a new upper model to be replaced are set. Model support 7'
prepared in this order.

In this state, when the empty model support stand 33 is carried to the replacement position on the carrying roller conveyor 23 (right next to the joint device 1), the feed bar 22 is raised via the swing link 25 by the operation of the lift cylinder 28. By the model transfer pin 22a of the feed bar 22, the empty model support stand 33 on the carrying-in roller conveyor 23 and the model of the old upper model to be replaced are released from the clamps on the joint table 6. The support body 7 is lifted via the pin receivers 36a and 7a, respectively. Subsequently, the feed bar 22 is moved forward by a predetermined amount by the operation of the feed cylinder 31 using the support roller 26 as a guide, and is then lowered via the swing link 25 by the operation of the lift cylinder 28, so that the empty model support table 33 is moved forward. is transferred onto the joint table 6, and the old model support 7 is transferred onto the roller conveyor 24 for carrying out. Thereafter, the feed bar 22 is moved back to its original position by the operation of the feed cylinder 31 and is on standby. Incidentally, the empty model support stand 33 transferred onto the bolt table 6 is positioned by the dowel pin 6a.

In this state, the joint device 1 is operated to raise (the lift cylinder and the squeeze cylinder are raised), and the empty model support 33 is raised together with the joint table 6, and the model mounted on the squeeze device 5 is replaced. The support plate 41 of the model receiving plate 38 is brought into contact with the lower surface of the old upper runner model 10. In addition,
In this case, since the model receiving plate 38 is elastically supported by the coil spring 40, the generation of impact upon contact is suppressed. In this state, when the clamp cylinder 12 of the clamp device 11 in the squeeze device 5 is activated to move the female occlusal member 15 backward and away from the male occlusal member 18, the clamp is released from the old upper runner. The model 10 is a model support stand 33
After that, the Jjort device 1
is operated to lower, and the model support stand 33 and the old upper runner model 10 are lowered together with the bolt table 6.
At this point, the loading roller conveyor 2
The model support stand 33' that received the new upper runner model 10' has been carried into the exchange position 3, and the old model support 7 on the carry-out roller conveyor 24 has also been carried out to a predetermined position.

Subsequently, the feed bar 22 again performs the transfer action as described above, that is, the action of raising → moving forward → lowering → retreating, and transfers the model support stand 33 ′ of the new upper runner model 10 ′ to the old one on the joint table 6 . Kamiyudo model 1
The roller conveyor 24 for carrying out the model support stand 33 of 0
After that, the joint table 6 of the joint device 1 is moved upward, and the new upper runner model 1 is moved upward.
0' is brought into contact with the lower surface of the squeeze plate 9 of the squeeze device 5. At this time, squeeze plate 9
The knock pin 20 engages with the hole 21 of the upper runner model 10 for positioning. In this state, the clamp cylinder 12 is operated to engage the female occlusion member 15 with the male occlusion member 18, thereby fixing the new upper runner model 10' to the squeeze plate 9. Thereafter, the empty model support 33' is lowered, but at this point the new model support 7' with the new upper model set is carried into the replacement position of the carry-in roller conveyor 23, while the unloading roller conveyor 2
The old upper runner model 10 and the model support stand 33 on the top 4 have been carried out to a predetermined position.

Next, the feed bar 22 performs a predetermined transfer operation as described above, and the new model support 7' is transferred onto the George table 6, and the empty model support 33' is transferred onto the unloading roller conveyor 24. ,
The new model support 7' is then fixed onto the bolt table 6 by the clamping device, while the empty model support 33' is carried out to a predetermined position, thus completing the model exchange.

In the above-described embodiment, the occlusal members 15 and 18 of the clamp device 11 for the upper runner model are engaged and disengaged, that is, both the clamping and the release of the upper runner model 10 are performed using fluid pressure. However, regarding the clamping action, it is more effective in terms of safety if spring force is used instead of fluid pressure. In addition, in this embodiment, a model transfer device is used in which the feed bar 22 performs a so-called box motion consisting of a combination of vertical movement and forward/backward movement, but the present invention is not limited to this. For example, There is no problem even if it is in the form of a D-shaped movement.

In addition, in this example, a molding machine that molds one upper mold is described, but it is possible to have a model support for the upper mold and a model support for the lower mold in one mold manufacturing machine, and to simultaneously mold the upper and lower molds. In the case of a mold making machine, the present invention can be implemented using a model changing device having double rows of feed bar support pins and loading/unloading roller conveyors.

As detailed above, the present invention makes it possible to mechanically and automatically exchange two types of models: the upper model on the joint table and the upper runner model on the lower surface of the squeeze head. Therefore, according to the present invention, it is possible to significantly shorten the working time for model exchange compared to the conventional method, and it is greatly useful for improving the production rate of mold making, and it also saves workers time. It can free people from troublesome and dangerous work.

In addition, the model replacement according to the present invention skillfully utilizes the functions of existing equipment for most of the work, and only requires adding a new model support stand and clamping device for the upper runner model. , equipment costs for model replacement can be kept low.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view showing a mold making machine and a device for model exchange;
Figure 2 is a plan view (however, the sand charging device and squeeze device are omitted), Figure 3 is a bottom view showing the clamping device of the upper runner model, Figure 4 is a side sectional view, and Figure 5 is a side sectional view. FIG. 6 is a front sectional view showing a model support stand for an upper runner model, and a side sectional view. 1...Jjort device, 4...Casting sand charging device, 5
... Squeeze device, 6 ... Georget table, 7
...Model support, 8...Squeeze head, 10...
...Upper runner model, 11...Clamp device, 22...
Feed bar, 23...Roller conveyor for loading,
24... Roller conveyor for carrying out, 28... Lift cylinder, 31... Feed cylinder, 33...
Model support stand, 38...model receiving plate.

Claims (1)

[Claims] 1 A joint table for mold making is sandwiched between an inlet conveyor on one side and an outlet conveyor on the other side,
In a mold making machine equipped with a model transfer device that transfers the model from the carry-in conveyor side to the carry-out conveyor side via the bolt table, the model transfer device transfers the empty model support stand on the carry-in conveyor. The process of transferring the old molding model on the jort table and the former molding model on the jort table onto the carry-out conveyor, and raising the model support base to a predetermined position via the jort table, the squeeze head of the squeeze device After detaching the former upper runner model which is fixed via a clamping device to the model, the model is supported on a model support stand and lowered to its original position, and the model on the carry-in conveyor is removed by the model transfer device. Step of transferring the support stand and the new upper runner model supported on it onto the joint table, and the process of transferring the model support stand on the joint table and the old upper runner model supported on it onto the carry-out conveyor. Then, raise the new upper runner model together with the model support via the bolt table to a predetermined position, fix the new upper runner model to the squeeze head via the clamp device, and then lift only the model support to the original position. a step of lowering the model to a position, and a step of transferring, by the model transfer device, the model for a new mold on the carry-in conveyor onto the Jjort table, and the empty model support stand on the Jjort table onto the carry-out conveyor. A model exchange method in a mold making machine characterized by the following.