JP4061565B2 - Mold making machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding machine that molds a mold by squeezing casting sand filled in a casting frame on a model plate or a molding chamber defined by a frame, a model plate, and a squeeze plate by moving the squeeze plate. Regarding improvement.
[0002]
[Prior art]
Conventionally, as one of the mold making machines, casting sand filled in a molding chamber defined by a frame body, a model plate, and a squeeze plate is squeezed by moving a squeeze plate by an extension operation of a hydraulic cylinder, and a mold is obtained. Some are configured to mold.
[0003]
[Problems to be solved by the invention]
By the way, the squeeze of the foundry sand is generally performed in a state where air exists in a cavity or the like in the foundry sand, and the pressure switch provided in the hydraulic circuit for operating the hydraulic cylinder operates at the set pressure value. The squeeze process is forcibly completed. For this reason, immediately after the squeeze is completed with the air in the mold compressed, the pressure switch is activated and the hydraulic cylinder is operated in reverse, and accordingly, the mold is squeezed with the compressed air mixed inside. As a result, the process was completed, and as a result, some sand particles were lifted in the mold, and the mold had problems such as non-uniform hardness.
[0004]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a mold making machine capable of arbitrarily setting the mold hardness to a required height.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the mold making machine according to the present invention moves a squeeze plate into a molding chamber defined by a frame, a model plate, and a squeeze plate, or casting sand filled in a cast frame on a model plate. In the mold making machine for squeezing by a mold, an electric cylinder with a brake for moving the squeeze plate is provided, the electric cylinder with a brake has a load detecting means for detecting the magnitude of the load, and the operation of the brake The brake control means for controlling the time is electrically connected, so that the operation of the electric cylinder with brake is temporarily stopped by the operation of the brake control means after the time when the load detection means detects the set value. It is characterized by that.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a mold making machine to which the present invention is applied will be described in detail with reference to FIG. A blow head 1 is mounted on a machine base (not shown), and an L-shaped rotary frame 2 is mounted on the machine base so that it can be turned up and down by 90 degrees. A lower frame 3 is attached to the left part of the rotating frame 2, and a guide bar 4 extending along the lower frame 3 is installed at the lower part of the rotating frame 2.
[0007]
An upper frame 5 and an upper squeeze mechanism 6 are slidably mounted on the guide bar 4. The upper squeeze mechanism 6 includes an upper squeeze plate 7, a support bar 8 that supports the upper squeeze plate 7, The support member 9 is slidably mounted on the guide bar 4 and has the support rod 8 slidably penetrated in the direction in which the guide bar 4 extends. Further, the support rod 8 of the upper skies mechanism 6 is provided with a protruding member 10 that can be locked to a skies mechanism 11 described later.
[0008]
Further, a squeeze mechanism 11 for bringing the upper squeeze plate 7 and a lower squeeze plate 15 described later close to each other is separately provided below the upper and lower frame bodies 5 and 3. The squeeze mechanism 11 is separately provided. A fixedly arranged guide bar 12 extending in the left-right direction, a moving frame 13 slidably mounted on the guide bar 12, and an electric cylinder 14 with a brake mounted on the left portion of the moving frame 13 and extending along the same. The lower squeeze plate 15 is fixed to the tip of the output rod of the electric cylinder 14 with brake. In addition, a recess is formed in the upper part of the moving frame 13, and the upper right end of the moving frame 13 can be locked to the protruding member 10 of the upper squeeze mechanism 6 in the state shown in the drawing.
[0009]
The brake-equipped electric cylinder 14 is configured to convert the rotational movement of the output shaft of the electric motor into a linear movement by a screw mechanism so as to extend or contract the output rod, and further to maintain the position of the output rod. An electromagnetic brake (not shown) can stop the expansion / contraction operation of the output rod at an arbitrary position (see Japanese Patent Laid-Open No. 3-128686, Japanese Utility Model Publication No. 6-40447). A control panel 16 is electrically connected to the brake-equipped electric cylinder 14, and an ammeter (not shown) serving as load detection means for detecting the magnitude of the load of the brake-equipped electric cylinder 14 is connected to the control panel 16. And a timer (not shown) as a brake control means for controlling the operation time of the electromagnetic brake of the electric cylinder 14 with brake. In the figure, reference numeral 17 denotes a match plate.
[0010]
As shown in FIG. 1, the structure constructed in this way is as follows. After the match plate 17 is loaded between the upper and lower frame bodies 5, 3, a cylinder (not shown) is extended to operate the upper frame body 5 to the lower frame body 3. The upper and lower frame bodies 5 and 3 and the match plate 17 are brought into a superposed state in close proximity to each other, and the upper and lower frame bodies 5 and 3 and the match plate 17 in the superposed state, the rotating frame 2 and the like are rotated by a rotation mechanism (not shown). Then, the sand blowing ports of the upper and lower frame bodies 5 and 3 are connected to the sand blowing holes of the blow head 1. Next, the upper squeeze plate 7 is inserted into the other frame opening of the upper frame 5 and the lower squeeze plate 3 is slightly inserted into the other frame opening of the lower frame 3, respectively. The molding chamber is defined by the match plate 17 and the upper / lower squeeze plates 7/15.
[0011]
Next, the foundry sand is blown into the molding chamber from the blow head 1, and then the brake-equipped electric cylinder 14 of the squeeze mechanism 11 is extended to bring the upper and lower squeeze plates 7 and 15 closer to each other. To skies. Note that the squeeze pressure of the foundry sand can be arbitrarily specified by arbitrarily selecting a set value detected by the ammeter. Then, during the squeeze process, after the ammeter detects a set value set arbitrarily and appropriately in advance, the extension operation of the brake-equipped electric cylinder 14 is stopped for a required time by the operation of a timer set arbitrarily and appropriately. (See Figure 2). As a result, the air in the mold is compressed to a high pressure, but immediately flows between the particles of the foundry sand and is discharged to the outside.
[0012]
Thus, after the squeezing of the foundry sand is completed, the brake-equipped electric cylinder 14 is contracted and the cylinder (not shown) is operated to separate the upper and lower squeeze plates 7 and 15 from each other and to extract them from the upper and lower frame bodies 5 and 3 respectively. Subsequently, the upper and lower frame bodies 5 and 3, the match plate 17, etc. are horizontally inverted 90 degrees by a rotation mechanism (not shown) by horizontally rotating the upper and lower frame bodies 5 and 3, the match plate 17, etc. Return to the state. Next, the upper frame 5 is once raised and pulled away from the lower frame 3, and then the match plate 17 is separated from the lower frame 3. Next, the upper and lower frame bodies 5 and 3 are brought close again to overlap each other, and then the upper and lower molds are extracted from the upper and lower frame bodies 5 and 3 to complete one cycle.
[0013]
In addition, although the electric cylinder 14 with a brake of said Example is a case where it applies to the type | mold molding machine of the type which squeezes the foundry sand of the molding chamber defined by a frame, a model board, and a squeeze board, It is not limited to a mold molding machine of the type, and the brake-equipped electric cylinder 14 is the same even if it is applied to a mold molding machine of a type in which the casting sand filled in the casting frame on the model plate is squeezed by moving the squeeze plate. The following effects can be obtained.
[0014]
【The invention's effect】
As is apparent from the above description, the present invention squeezes the molding sand filled in the molding chamber defined by the frame body, the model plate, and the squeeze plate or the cast frame on the model plate by moving the squeeze plate. In a mold making machine for molding a mold, an electric cylinder with a brake for moving the squeeze plate is provided, and the electric cylinder with a brake controls a load detecting means for detecting the magnitude of the load and an operation time of the brake. Since the brake control means is electrically connected, the operation of the electric cylinder with brake is temporarily stopped by the operation of the brake control means after the time when the load detection means detects the set value. There are excellent practical effects such as that the hardness can be arbitrarily set and the required height can be accurately obtained.
[Brief description of the drawings]
FIG. 1 is a schematic front view of an embodiment of the present invention.
FIG. 2 is a graph showing a relationship between a load current value and a brake signal in a brake operation process in one embodiment of the present invention.
[Explanation of symbols]
7 Upper skies plate 14 Electric cylinder with brake 15 Lower skies plate 16 Control panel 17 Match plate

Claims (2)

In a mold making machine for forming a mold by squeezing casting sand filled in a casting frame on a model board or a molding room defined by a frame body, a model board and a squeeze board by moving the squeeze board,
An electric cylinder with a brake for moving the squeeze plate is provided, and an electric cylinder with a brake is electrically connected to a load detecting means for detecting the magnitude of the load and a brake control means for controlling the operating time of the brake. ,
Thus, after the time when the load detecting means detects the set value, the operation of the electric cylinder with brake is temporarily stopped by the operation of the brake control means for a required time. In the mold making machine according to claim 1,
A mold making machine characterized in that the load detecting means can set a load of an arbitrary size.

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