JPS5916861B2 - Hollow mold making machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a hollow mold comprising a fixed mold, a movable mold, and a mandrel disposed between the two molds, and in particular to an improvement in a driving device for the mandrel. It is related to.

In a mold making machine that uses a mandrel, after molding, the movable mold is separated from the fixed mold and the mandrel is moved toward the movable mold by 1/2 of the stroke of the movable mold to take out the mold. A movable drive source (hydraulic cylinder, etc.) for moving the mandrel.
Usually, a separate drive source was provided.

Further, a guide device for moving the mandrel, that is, a guide device for moving the mandrel in parallel to the moving direction of the movable mold, was also provided separately from the guide device for the movable mold.

For this reason, the device for moving the mandrel increases the cost of the entire device, and since the guide device for moving the mandrel is generally installed below the position of the structural earth and metal in the molding machine, it is prone to wear due to molding sand, etc. There were many problems that prevented smooth operation.

In addition, Japanese Patent Application Laid-open No. 51-29319 and Japanese Patent Publication No. 51
Publication No. 37044 describes a technique in which a mandrel is moved in conjunction with the movement of a movable mold in a hollow mold making machine, thereby omitting a dedicated drive source for moving the mandrel.

However, in the hollow mold making machines described in these documents, the mandrel holding member is guided by a dedicated guide member provided separately from the movable mold guide member, and the mandrel is not linked to the movement of the movable mold. Since a spring is used to move the mandrel, the device for moving the mandrel is still complicated, and it is difficult to say that the above-mentioned drawbacks have been completely solved. , by making the device for moving the mandrel as simple as possible.
The purpose was to provide a hollow mold making machine that was as inexpensive as possible.

In order to achieve this object, the hollow mold making machine according to the present invention includes a first fixing member and a second fixing member, which are arranged facing each other at a certain distance apart and are connected to each other by a plurality of tie bars. , (b) a fixed mold fixed to a first fixed member, and (C) a movable mold supported in a state opposite to the fixed mold, guided by a plurality of tie bars and supported by a second fixed member. a movable member that is driven by a drive device and moves between a position where both molds are in close contact with each other and a position where they are separated by a certain distance; (d) a mandrel disposed between the fixed mold and the movable mold; ) a mandrel holding member that holds the mandrel and is supported movably in a direction parallel to the moving direction of the movable member by a plurality of tie bars;
(g) abutting portions provided at mutually opposing portions of the mandrel holding member and the movable member, and contacting each other when the movable member moves forward to advance the mandrel holding member together with the movable member; At least one of these members is passed through in parallel to the moving direction of both members, and a stopper is provided at the penetrating end to prevent the two members from being separated by more than the H point limit, so that the movable member can be moved a certain distance. After retracting, the mandrel holding member is configured to include a connecting rod that retracts the mandrel holding member together with the movable member by the action of a stopper.

In the hollow mold making machine configured as described above, the mandrel holding member is moved while being guided by the tie bar, so there is no need to provide a dedicated guide means to guide the movement of the mandrel.

In addition, in order to move the mandrel in conjunction with the movement of the movable mold, contact portions are provided at opposing portions of the movable member supporting the movable mold and the mandrel holding member supporting the mandrel. A connecting rod is used that does not allow the mandrel holding member and the movable member to be separated by more than a certain distance.

In other words, in this hollow mold making machine, the only thing added to move the mandrel is the abutting part and the connecting rod, and it is extremely easy to form the abutting part, and the connecting rod can also be used for bending and compressive loads. Since it only receives a simple tensile load without being subjected to any stress, it can be made extremely thin.

Therefore, the device for moving the mandrel is simpler than before, and it is possible to provide an inexpensive hollow mold making machine.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a core molding machine will be described in detail below with reference to the drawings.

1 is a bed of a molding machine, and fixed molds 3 are removably fixed on both sides of a fixed die plate 2 (first fixing member) fixed on the bed 1.

A movable die 4 facing the fixed die 3 is removably fixed to a movable die plate 6 (movable member) guided by tie bars 5, 5' (guide members) consisting of two upper and lower tie bars, and is used for moving the movable die plate. It is driven by a cylinder 7 (driving device) and can be moved in the left-right direction in FIGS. 1 and 3.

The cylinder 7 is fixed to a fixing member (second fixing member) 22 which is vertically fixed to the bed 1, and the fixing member 22 is connected to the fixed die plate 2 by tie bars 5, 5'. As shown in the figure, it is detachably attached to a mandrel die plate 9, and the mandrel die plate 9 is attached to a mandrel base 17 (mandrel holding member) via a mandrel drawing cylinder 16.

This mandrel base 1T consists of the two tie bars 5'
is supported so as to be movable in a direction parallel to the first direction of movement of the movable die plate 6.

The connecting rod 10 is connected to the tie bar 5 on the mandrel base 1T.
', and in a position that does not interfere with the fixed mold 3, movable mold 4, and mandrel 8 (see FIG. 3).

As shown in FIG. 2, the tip of the connecting rod 10 passes through a through hole 11 provided in the movable die plate 6, and a nut 13 (stopper) for preventing removal is fixed to the through end. A stepped portion 14 (contact portion) is formed near the base end.

That is, when the movable die plate 6 is separated from the mandrel base 11 by a predetermined distance (approximately half of the stroke of the movable die plate 6) when the mold is opened, the nut 13 comes into contact with the back surface 12 of the movable die plate 6, and conversely, the nut 13 comes into contact with the back surface 12 of the movable die plate 6, and vice versa. If you get close.

The stepped portion 14 is the front surface 15 (contact portion) of the movable die plate 6
K is configured to make contact.

In such a configuration, the movable die plate 6 is connected to the cylinder 7.
When the movable die 4 is moved forward in the direction approaching the fixed die plate 2 by The front surface 15 of the plate 6 is in graphic contact with the stepped portion 14.

Furthermore, as the movable die plate 6 is advanced, the mandrel pace 17 is also advanced.

At the position where the movable mold 4 comes into contact with the fixed mold 3, the forward movement of both is stopped.

At this time, the respective parting surfaces of the stationary mold 3 and the movable mold 4 are in close contact with each other, and the lateral position of the mandrel is determined with respect to the cavity formed therein.

Next, the mandrel drawing cylinder 16 is actuated and the mandrel 8 is lifted upwards in FIG. ．． It is in a clamped state together with the movable mold 4.

In this state, molding is performed, and after the molding is completed, the apparatus is operated in the reverse order as described above.

First, the mandrel 8 is pulled downward in FIG. 4, and then the movable die plate 6 is retracted.

At the beginning of this retreat, the mandrel base 11 is still stationary, but when the moving amount of the movable die plate 6 reaches a predetermined amount (approximately 1/2 of the total stroke), the back surface 12 of the movable die plate 6 touches the nut 13. Since the connecting rod 10 is pulled to the left by contacting itself, the mandrel base 17 moves to the left together with the movable die plate 6, and the mandrel 8 is separated from the fixed mold 3.

When the movable die plate 6 reaches the open end (the most retracted position), as shown in FIG.
is stopped at an intermediate point between the stationary mold 3 and the movable mold 4, and thereafter the core is deposited outside the machine using the same means as in a normal core making machine, such as an unloader, and one cycle is completed.

As mentioned above, the interlocking mechanism of this embodiment has an extremely simple structure and reliable operation, and as a result, the driving force of the movable die plate 6 can be used to move the mandrel base 17, and the mandrel pace 17, a driving source such as a cylinder for movement can be omitted, and a control device for the same is also unnecessary, making it possible to significantly reduce the cost of the device.

Further, the mandrel movement guide member and the movable die plate movement guide member are connected to the fixed die plate 2 and the fixed member 22.
Since the tie bars 5 and 5' are also used to connect the
Since it is not provided directly under the mold and is round bar-shaped, there is less risk of molding sand getting on it, and even if it does get on it, it is easy to remove, so it prevents wear on the guide surface and allows it to be used long and short. Stable operation is guaranteed.

Although the device exemplified above is the most preferred example for carrying out the present invention, the present invention is not equally limited to this, and various modifications and improvements other than those exemplified above can be made based on the knowledge of those skilled in the art. Additional embodiments may be implemented.

For example, in FIG. 2, the connecting rod 10 has a threaded portion for a nut 13 at the left end, which is used to prevent the rod from being pulled out and to adjust the length of the rod. The left end is fixed to the movable die plate 6, the right end passes through the mandrel base 17, and a nut screwing part may be provided at the penetrating end, and the die plate passes through the movable die plate 6 and the mandrel base 17 at both ends. However, pull-out prevention stoppers may be provided at both penetrating ends.

Further, in FIG. 1, the mandrel can be moved in the same way in the case of one set for 75 people or a combination of three or more sets, which shows a state in which two sets of fixed type and movable type are added.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted front view showing an embodiment of the present invention.
FIG. 2 is an enlarged sectional view showing the vicinity of the connecting rod. 3 is a plan sectional view of the left half of the apparatus shown in FIG. 1, and FIG. 4 is a sectional view taken along the line IV--■ in FIG. 2...Fixed die plate (first fixing member),
3...Fixed type, 4...Movable type, 5,5
'...Tie bar (guide member), 6...
Movable die plate (movable member), 7... cylinder (drive device), 8... mandrel, 10...
-・Round rod, 13... Nut (stopper)
, 14...Stepped part (contact part). 17... Mandrel base (mandrel holding member). 22... Fixed member (second fixed member).

Claims (1)

[Claims] 1. Disposed facing each other at a certain distance apart,
a first fixed member and a second fixed member that are coupled to each other by a plurality of tie bars; a fixed mold fixed to the first fixed member; a movable mold supported in a state opposite to the fixed mold; a movable member that is guided by a tie bar and driven by a drive device supported by the second fixed member to move between a position where both molds are in close contact with each other and a position where they are separated by a certain distance; a mandrel disposed between the front Hp movable mold; a mandrel holding member that holds the mandrel and is supported movably in a direction parallel to the moving direction of the movable member by the plurality of tie bars; a self-contacting part that is provided at a portion where the mandrel holding member and the movable member face each other, and when the movable member moves forward, the self-contacting portion contacts each other to advance the mandrel holding member together with the movable member; the movable member and the mandrel holding member; At least one of the members is passed through in parallel to the moving direction of both members, and a stopper is provided at the penetrating end to prevent the two members from being separated beyond a certain limit, so that the movable member A hollow mold making machine comprising: a connecting rod for retracting the mandrel holding member together with the movable member by the action of the stopper after retracting by two predetermined distances.