JPH0214847Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a forming device for sprues and runners in a mold making machine.

Conventionally, when molding the sprue and runner, the runner is molded in a separate device in the subsequent process after the sprue is molded during squeezing, or when the sprue and runner are molded at the same time, A sprue cup with a through hole penetrating upward and downward in the center is installed vertically on the bottom surface of the squeeze board, and a hot water that can be inserted into the through hole of the sprue cup is installed on the upper surface of the lower model board corresponding to this sprue board. The sprue and runner can be molded at the same time by setting up the sprue rod, moving the squeeze board or model plate relatively upward and downward, and inserting the sprue rod into the through hole of the sprue cup. I was doing it. However, in the former case, separate equipment must be installed, which increases equipment costs, and in the latter case, the through hole of the sprue cup and the center of the runner rod must be aligned, so the model It was necessary to perform centering work every time the board was replaced, which caused problems from a productivity standpoint, and if centering was incorrect, there were problems such as damage to sprue cups, runner rods, etc. .

The present invention aims to solve these problems.

The configuration of the present invention will be explained below based on examples. Reference numeral 1 denotes a squeeze cylinder mounted downward on a fixed frame (not shown), and the lower end of the piston rod 1a is provided with a cylinder portion 2 consisting of a large diameter cylinder portion 2a and a small diameter cylinder portion 2b, and the outer circumference of the piston rod 1a is provided with a cylinder portion 2 consisting of a large diameter cylinder portion 2a and a small diameter cylinder portion 2b. A supply/discharge hole 2c communicating with the small diameter cylinder portion 2b is bored. A piston 3a fixedly connected to a piston rod 3 is slidably inserted into the cylinder portion 2, and a step portion 5b is provided protruding from the back surface of a flange portion 5a at the lower end opening of the cylinder portion 2. The front cover 5, which is equipped with a supply/discharge hole 5c that communicates from the outer periphery of the portion 5a to the back surface of the stepped portion 5b, fits the stepped portion 5b into the cylinder portion 2 via an O-ring b, and also connects the mounting plate (described later) via the flange portion 5a. It is attached together with screw 7 by tightening it together with screw 8. As described above, the main parts of the cylinder device 4 for operating the sprue rod include the cylinder portion 2, the piston rod 3, the piston 3a, and the like.

The mounting plate 7 is set to a size that can be inserted into a casting flask (not shown), and a protrusion 7a protruding from the center of the back surface has a recess 7c having a groove 7b on the inner peripheral surface.
is formed, and supply and discharge holes 7d and 7e are formed on the outer peripheral surface of the projection 7a, and a through hole 7f is bored in the center of the recess 7c.
Then, the mounting plate 7 is loosely inserted into the front cover 5 through the recess 7c and abutted thereon through the O-ring 9, and is also fitted into the lower end of the piston rod 1a through the O-rings 10, 11, and is connected to the supply/discharge hole 7d. 5c, and the supply/discharge hole 7
e and 2c are in communication with each other, and are attached together with the front cover 5 by screws 8. 12
1 is a squeeze board having a through hole 12a bored in the center thereof, and the squeeze board 12 is removably attached to the lower surface of the mounting plate 7 with the through hole 12a aligned with the through hole 7f. Reference numeral 13 denotes a sprue cup having a through hole 13a in the center having approximately the same diameter as the through hole 12a, and the sprue cup 13 connects the through hole 13a to the through hole 7f on the lower surface of the squeeze board 12.
It is screwed onto the concentric position of 12a.

Further, the piston rod 3 of the cylinder device 4
The lower end of the piston rod 3 protrudes below the mounting plate 12 through the through hole 7f, and a runner rod 14 having a slightly smaller diameter than the through hole 13a is screwed to the lower end of the piston rod 3. The lower end is connected to the sprue cup 1 when the piston rod 3 is shortened.
It is made to be the same as the bottom surface of 3.

Next, the operation of the device configured as described above will be explained. In the state shown in Fig. 1, pressurized fluid is supplied to the head side of the squeeze cylinder 1 to lower the squeeze board 12 at the tip of the piston rod 1a, and compressed fluid is supplied to the cylinder part 2 from the supply and discharge holes 7e and 2c to complete the runner. Connect the rod 14 to the sprue cup 13
protrude downward. When the squeeze board 12 is lowered in this state and the squeeze board 12 is inserted into the flask (not shown) to a predetermined position, and the lower end of the runner rod 14 comes into contact with the upper surface of the model plate (not shown), the squeeze cylinder 1 is The supply of pressure fluid is stopped and the downward movement of the squeeze board 12 is stopped. Next, molding sand is blown into the space of the flask whose upper and lower surfaces are closed by the squeeze board 12 and the model plate to fill the space with molding sand. Subsequently, compressed fluid is again supplied to the head side of the squeeze cylinder 1, and the squeeze board 12 is lowered to squeeze the molding sand in the space. At this time, the supply/discharge hole 2
c and 7e to the exhaust side to push the piston 3a into the head side of the cylinder part 2 while discharging the pressure fluid on the head side of the cylinder part 2a in accordance with the squeeze speed, and a load is applied to the model plate. to prevent damage to it. After the squeeze is completed, pressurized fluid is supplied to the rod side of the squeeze cylinder 1 to remove the squeeze board 12 from the flask and rise above the flask. Return the dowel 14 into the sprue cup 13 again.

Thereafter, the above operation is repeated.

As is clear from the above explanation, according to the present invention, the sprue and runner can be molded at the same time in one place, and there is no need to perform centering work every time the model board is replaced, so productivity is improved. In addition, even if the mold thickness changes, it can be changed arbitrarily, and even the runner rod,
Since the sprue cup and the like are integrated into one piece, the device has the advantage of becoming more compact, making it a significant contribution to this type of industry.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention. 1... Squeeze cylinder, 1a, 3... Piston rod, 4... Cylinder device, 7... Mounting plate,
12... Squeeze board, 13... Sprue cup,
13a...through hole, 14...runner rod.

Claims (1)

[Scope of utility model registration request] The squeeze cylinder 1 is mounted downward, and the squeeze board 12 is fixed to the lower end of the piston rod 1a via the mounting plate 7, and a through hole 13a through which the runner rod 14 can be inserted is formed in the center of the lower surface of the squeeze board 12. A bored sprue cup 13 is attached coaxially with the piston rod 1a, and a cylinder device 4 for operating the runner rod is built into the lower end of the piston rod 1a, and the piston rod 3 of the cylinder device 4 is connected to the squeeze board 1.
A runner rod 14 is connected to the lower end of the piston rod 3, and the runner rod 14 is inserted into the through hole by the operation of the cylinder device 4. 1. A molding device for a sprue and runner in a mold making machine, characterized in that the sprue cup 13 is provided so as to be able to protrude below the sprue cup 13 through the sprue cup 13a.