JPS63264249A - Metallic die vice upper part continuously opening type blowing-down molding machine - Google Patents

Abstract

PURPOSE:To easily and efficiently perform the changing work of a die by a hoist crane, etc., in the case of fitting and removing a die by making the die vice upper part a continuously opening type and with the mechanism capable of press-fitting a blowing head to the die vice upper face only at the time of blowing down a molding sand. CONSTITUTION:An assembly body 1 is opened and closed by an opening and closing cylinder 3. A core is taken out by transferring a molding mold onto a conveyor unloader 4 by making a movable side die downwards by a downward cylinder 3. A sand feeding tank 5 and blowing head 6 are connected by a flexible piping 15 of large bore and pressurized by inputting sand and the air of continuously blowing pressure. The blowing head 6, press-fitting cylinder 7 and blowing shutter cylinder 8 are moved by a swing cylinder 9 to the die upper part. The sand is then blown into the die by opening the shutter by the actuation of the blowing shutter cylinder 8 by press-fitting the blowing head 6 to the die with the press-fitting cylinder 7 to execute a mold molding.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a top blow mold making machine in which the upper part of the mold vise is always open, that is, it has no upper plate of the machine frame or any other mechanism. .

Conventional technology (1) Conventional mold making machines have a machine frame upper plate, crimping cylinder, molding sand hopper, etc. permanently installed above the mold vise (assembly), and the blow head is located at the sand replenishment position and the crimping It is a mechanism that moves between the lower part of the cylinder (above the mold assembly) by being suspended from a rail etc. provided on the upper plate, and performs the blowing operation by pressing the blow head against the upper surface of the mold using a pressure cylinder. (2) In the rollover type (or dump type) molding method, which has become a classic method in current mold manufacturing technology, a molding sand tank is attached to the mold vise and these mechanisms are rotated 180 degrees. A shell mold making machine is known in which the mold is made using a mold vise, and no mechanism is provided above the mold vise.

Problem to be Solved by the Invention In the method (1) above, it is difficult to replace the mold because the structure is always above the mold vise. Various devices have been devised, including a mechanism that moves the entire machine from below the machine frame, but it is known that this not only complicates the mechanism, but also causes various problems, such as an increase in the installation area of the molding machine.

Further, the method (2) above is a one-way rollover method,
This method is not applicable to all molding methods, and has other drawbacks such as sand replenishment, making it unsuitable for continuous molding operations.

Means for Solving the Problems The present invention has been successfully developed as a result of various studies and experiments in order to solve the above-mentioned problems, and the technical structure of the present invention is within the scope of the above claims. As specified in each section, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing an example of the apparatus of the present invention in which a blow head is attached to the tip of a swing arm, FIG. 2 is a left side view of FIG. 1, and FIG. 3 is a plan view of FIG. 1.

The mold making machine shown in the figure is an inverted sand discharge type vertically split mold machine.
1) is a mold vise consisting of a fixed side mold and a movable side mold,
(2) is a clamp cylinder, (3) is a movable side mold downward cylinder, and (4) is a conveyor unloader, and the operation mode of these is as known.

The characteristic structure of this example is that it has a swing arm surface whose one end is pivoted to an appropriate location on the frame 04, and a blow head (6) equipped with a pressure cylinder (7) is attached to the tip of the swing arm surface. By the operation of the swing cylinder (9), the blow head (6) rotates to the position shown by the broken line in Fig. 1, and stops at a predetermined position above the mold vice, and by the operation of the crimping cylinder (7), the blow head (6) rotates to the position shown by the broken line in Fig. 1. 6) is a mechanism in which the blow plate is pressed against the upper surface of the mating mold to enable blowing (top blow). Therefore, if it is necessary to open the upper part of the mold assembly for mold replacement or other cases, swing arm 0
The blow head (6) can be returned to its original position at any time by the rotation of the blow head (6).

The operating mode of the molding machine with the above mechanism will be briefly explained below.The two-mold assembly (2) is opened and closed by an opening/closing cylinder (2). To take out the core, turn the movable side mold downward using the downward cylinder 〇, transfer the mold to the conveyor unloader ■, and take it out. The blowing method uses constant pressure blowing, and the sand replenishment tank ■ and the blow head ■ are connected by a flexible pipe with a large diameter ■, and the sand is filled and air is constantly injected to keep it pressurized. Move the blow head ■, the crimping cylinder, and the blowing shutter cylinder ■ to the top of the mold using the swing cylinder ■, press the blow head ■ to the mold with the crimp cylinder ■, open the shutter by the operation of the blowing shutter cylinder ■, and release the metal. Blow sand into the mold (top blower type),
The mold is made according to the conventional method.

Immediately after blowing, close the blow shutter cylinder ■ and move the blow head ■ up and out of the machine. In the conventional method, the blowing method uses temporary pressurization, so it is necessary to discharge the air in the blow head after blowing, but with the constant pressurization method, air discharge is not necessary.

Sand is replenished from the hopper [phase] to the sand replenishment tank (2), but the replenishment is not related to the number of times of blowing, but is replenished according to the size of the mold to be molded. When replenishing sand, remove the air from the blow tank ■ and open and close the replenishment shutter cylinder @.

Figure 4 shows the blow head (■) supported by the blow head traversing frame (phase), and the blow head traversing frame (■) sliding and traversing on the blow head traversing guide rod (■) by the operation of the blow head traversing cylinder (phase). , shows another example in which the upper part of the mold vise is open. The mechanism other than the above-mentioned operation is the same as the mechanism shown in FIGS. 1 to 3.

An example of a shell mold making machine has been described above, but it can be applied not only to the shell molding method but also to dry sand method or wet sand method mold making by making slight changes and modifications to the mechanism to suit each method. It will be obvious to those skilled in the art that

Further, in the above example, the "continuous pressurization" method was explained, but it can also be applied to blow molding using the temporary pressurization method by slightly changing or modifying the molding sand blowing system.

Effects of the invention (1) Since the upper part of the vise is open, when installing and removing the mold, it can be suspended and replaced without any hindrance using a hoist crane, etc., making the mold replacement work simple and efficient. can be done.

(2) The heat radiated from the heating mold is smoothly dissipated into the machine,
The structure can be simplified since there will be no clumping, and therefore thermal effects on related equipment can be avoided, and special water cooling can be omitted.

(3) The machine height is lowered, which not only makes it easier to replenish molding materials, but also relieves machine maintenance from work at high places, and there are fewer restrictions on machine transportation and installation.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of the device of the present invention in which a blow head is attached to the tip of a swing arm, Fig. 2 is a left side view of Fig. 1, Fig. 3 is a plan view of Fig. 1, and Fig. 4 is a plan view of Fig. 1. It is a front view showing another example in which the blow head is of a transverse type, and in the figure = 1.
... Mold (movable side and fixed side), 2... Clamp cylinder, 3... Movable side mold downward cylinder, 4...
Conveyor unloader device, 5...Sand supply tank, 6.
...Blow head, 7...Crimp cylinder, 8...
Follow-up shaft center cylinder, 9... Swing cylinder, 10... Hopper, 11... Chute, 12... Sand replenishment shutter cylinder, 13.
...Swing arm, 14...Frame (machine frame), 1
5... Flexible tube, 16... Blow head transverse cylinder, 17... Blow head transverse guide rod, 18...
・Blow head horizontal frame.

Claims (4)

[Claims] (1) A blow-down molding machine with the top of the mold vise always open, characterized by a mechanism in which the top of the mold vise is always open, and a blow head can be crimped onto the top surface of the mold vise only when blowing down molding sand. . (2) In a molding machine having a vertically split mold vise, the blow head equipped with a compression cylinder is moved and placed above the mold assembly by a swing or traverse mechanism, and the blow head and sand replenishment tank are connected to each other. A blow-down molding machine with a mold vise that is always open from above, as set forth in claim 1, wherein the mold vise is communicated by a flexible tube. (3) A blow-down molding machine with a mold vise that is always open from above, as set forth in claim 1, wherein the blow head is attached to the tip of a swing arm that is pivotally connected to a machine stand. (4) A blow-down molding machine with a mold vise that is always open from the top as set forth in claim 1, wherein the blow head is attached to a blow head traversing frame that traverses on guide rods provided on both sides of the vise device.