JPH04294840A - Flaskless molding device - Google Patents

Abstract

PURPOSE:To mold a cope and a drag where upper and lower molding spaces are made and molding sand is injected to be compressed by shifting cope and drag boxes and upper and lower molding sand blowing devices while detecting advancing/retreating distance with a first-fourth encorders. CONSTITUTION:While detecting the advancing/retreating distance with first and second encorders 14, 15, the cope and drag boxes 6, 7 are shifted and also while detecting the advancing/retreating distance with third and fourth encorders 40, 41, the upper and lower molding sand blowing devices 23, 24 are shifted. Further, a match plate 51 and the cope and drag boxes 6, 7 are shifted to position corresponding to the height of pattern part in the match plate 51 and also the upper and lower molding spaces corresponding to the height of pattern part in the match plate 51, are made and the molding sand is blown and further, compressed to mold the cope and the drag.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in equipment for simultaneously molding frameless upper and lower molds using match plates.

0002

[Prior Art] Conventionally, one type of mold making equipment, as shown in Japanese Patent Publication No. 56-37018, has a match plate arranged vertically and a pair of upper plates that can come into contact with and separate from the match plate.・Blow molding sand into a pair of upper and lower molding spaces defined by a lower formwork and a pair of upper and lower squeeze plates that can be fitted into the upper and lower formworks, respectively, using a sand blowing device. After filling, the molding sand was compressed and solidified with upper and lower squeeze plates to form upper and lower molds, and then the vertical upper and lower mold frames containing the molds were separated from the match plate, and then the molding sand was compressed and solidified using upper and lower squeeze plates. Some molds are constructed so that the molds are rotated once to a horizontal position, and then the upper and lower molds are brought together and extracted from the upper and lower molds.

0003

[Problems to be Solved by the Invention] However, in the conventional equipment configured in this way, the molding sand in the upper and lower molds is compressed by fixing the upper squeeze plate and moving only the lower squeeze plate to the upper squeeze plate side. This is done by moving the Therefore, there are differences in the filling degree of molding sand in the upper and lower molds, differences in the height of the model part on both the front and back sides of the match plate, and the sliding between the upper and lower molds and the guide bar that guides the molds. Due to dynamic resistance, etc., it is not possible to compress the molding sand in the upper and lower molds to the same degree, and there is also a difference in the force applied to the front and back sides of the match plate, causing an uneven load on the match plate. As a result, there have been problems such as the precision and strength of the mold being made to be poor and the match plate to be deformed. The present invention has been made to solve the above problems.

0004

[Means for Solving the Problems] In order to achieve the above object, in the mold making equipment of the present invention, first and second hydraulic cylinders are mounted on a rotating frame that is arranged to be movable up and down 90 degrees in a vertical plane. Upper and lower formworks that move forward and backward relative to each other, and first and second encoders that detect the forward and backward distances of the upper and lower formworks are respectively installed, and the upper and lower molds that hold the match plate and are in a vertical state. The third and fourth holes are placed in the opening at the other end of the frame.
The tips of the upper and lower sand blowing devices, which are moved forward and backward by hydraulic cylinders, are arranged so that they can be inserted into each other, and the upper and lower sand blowing devices are inserted into each other.
The sand blowing device has a third device that detects these advancing and retreating distances.
A fourth encoder is attached, and the first and second hydraulic cylinders are
1st and 2nd 4-port 3-position switching valve, 3rd 4-port 3
Position switching valve, 3 port 2 position switching valve, and 2 in parallel
The third and fourth hydraulic cylinders are connected to the hydraulic pressure generation source through the first and second pressure reducing valves in sequence, and the fourth and fifth four ports 3
It is connected to the outlet side of the third 4-port 3-position switching valve via a position switching valve, and the first to fourth encoders are connected to the first, second, fourth and fifth 4-port 2 via a control device. It is electrically connected to the electromagnet of the position switching valve, and a pressure switch is also installed between the rear cover of the third and fourth hydraulic cylinders and the fourth and fifth 4-port 3-position switching valves. This is a characteristic feature.

[0005]

[Operation] The equipment configured in this way detects the advancing and retreating distances of the upper and lower formworks using the first and second encoders, moves the upper and lower formworks closer to each other, and adjusts the height of the model part of the match plate. The match plate is held between the upper and lower formwork at positions corresponding to It is inserted a required distance into the openings at the other ends of the upper and lower molds holding the match plate to define upper and lower molding spaces corresponding to the heights of the model parts of the match plate. To compress the molding sand blown into the defined upper and lower mold spaces, the first to third 4-port 3-position switching valves are left as they are, and the 4-port 2-position switching valve is switched to the first
・By supplying low-pressure oil to the rear lid side of the second hydraulic cylinder through the second pressure reducing valve, the match plate is clamped by the upper and lower formwork with a small force, and then the upper and lower sand is blown in. The devices are moved forward relative to each other to compress the foundry sand blown into the upper and lower mold spaces. Completion of compression of the foundry sand is detected by a pressure switch.

[0006]

[Example] An example will be explained with reference to the drawings.
As shown in FIG. 1, which is a partially sectional front view, the machine base 1
A rotating frame 2 is mounted rotatably in a vertical plane via a support shaft 3, and a piston rod of a cylinder 5, which is pivotally supported on the machine base 1 via a bracket 4, is mounted on the lower left side of the rotating frame 2. The distal ends are rotatably connected, and the rotating frame 2 is configured to reciprocate 90 degrees up and down by the expansion and contraction of the cylinder 5. As shown in the figure, the rotating frame 2 is in a vertical state when it is rotated downward, and is in a horizontal state when it is rotated upward. Further, upper and lower formworks 6 and 7 are attached to the rotating frame 2 via an advancing/retracting device 8, and the advancing/retracting device 8 is attached to the rotating frame 2 in parallel with each other, as shown in FIG. The upper and lower formworks 6 and 7 are respectively moved by sliding members 9,
a pair of tie bars 11, 11 extending in the left-right direction and mounted so as to be reciprocally movable through the rotary frame 2;
It is comprised of two first and second hydraulic cylinders 12 and 13, which are mounted facing each other and whose piston rod tips are connected to the sliding members 9 and 10, respectively. Further, the rotating frame 2 is connected to first and second encoders 14 and 15 for detecting the advancing and retreating distances of the upper and lower formworks 6 and 7.
The whole is mounted on the machine base 1. Further, first and second 4-port 3-position switching valves 16 and 17 are connected to the first and second hydraulic cylinders 12 and 13, respectively. is connected to a hydraulic pressure source 22 via a third 4-port 3-position switching valve 18, a 4-port 2-position switching valve 19, and two first and second pressure reducing valves 20 and 21 provided in parallel. .

[0007] Also, at the upper position of the machine base 1, there are upper and lower sand blowers for blowing molding sand into the upper and lower formworks 6 and 7, which have been turned upward by 90 degrees from the state shown in Fig. 1 and are in a vertical state. Device 23
, 24 are mounted so as to be movable in the left and right direction via flanged rollers 25, 25 which face each other from side to side and are pivotally supported on the machine base 1. The upper blow head 26 is an L-shaped cylindrical upper blow head 26 whose tip part can be fitted into the other end opening of the upper formwork 6, and an inverted L-shaped upper blow head whose tip part can be fitted into the other end opening of the lower formwork 7. A cylindrical lower blow head 27 is mounted on flanged rollers 25 and 25 via running members 28 and 29, respectively. Opening/closing mechanisms 32 and 33 equipped with hoppers 30 and 31 are installed at the upper ends of the upper and lower blow heads 26 and 27, respectively, and blow plates 3 are installed at the lower ends of the upper and lower blow heads 26 and 27, respectively.
4 and 35 are attached respectively. Further, the tips of the piston rods of horizontal third and fourth hydraulic cylinders 36 and 37 fixedly installed on the machine base 1 are connected to the back surfaces of the upper and lower blow heads 26 and 27, respectively. The hydraulic cylinders 36 and 37 are connected to the outlet side of the third 4-port 3-position switching valve 18 via fourth and fifth 4-port 3-position switching valves 38 and 39, respectively (see FIG. 3). Further, on the back of the upper and lower blow heads 26 and 27, there is a third
- Parts of the fourth encoders 40 and 41 are connected,
The third and fourth encoders 40 and 41 are entirely mounted on the machine base 1. In addition, the first to fourth encoders 14
, 15, 40, 41 are connected to the first
Second, fourth and fifth 4-port 3-position switching valves 16, 17
, 38, and 39 are electrically connected to the electromagnets. In addition, the rear cover side of the third and fourth hydraulic cylinders 36 and 37 and the fourth and fourth hydraulic cylinders 36 and 37 are
Pressure switches 43 and 44 are disposed between the fifth four-port three-position switching valves 38 and 39, respectively.

A mold extraction device 45 is mounted on the running member 29 at a position on the left side of the lower blow head 27. A pull-out plate 47 is fixed to the lower end of the piston rod. Also,
A mold receiving device 48 is installed at a position directly below the downward rotation of the upper and lower mold frames 6 and 7 on the machine stand 1, and in the mold receiving device 48, an upward cylinder 49 installed on the machine stand 1 A receiving plate 50 is fixed to the tip of the piston rod. In the figure, 51 is a match plate, 52 is a check valve, and 53 to 55 are positioning cushion cylinders.

Next, the operation of the equipment constructed as described above will be explained. First, as shown in FIG.
After carrying it in between, the second and third 4-port 3-position switching valves 17 and 18 and the 4-port 2-position switching valve 19 are switched while detecting the advancing and retreating distance of the lower formwork 7 using the second encoder 41. , the second hydraulic cylinder 1 of the advancing/retracting device 8
Relatively high pressure oil is supplied to the rear lid side of 3 through the first pressure reducing valve 20 to extend the second hydraulic cylinder 13, and the lower formwork 7
The match plate 51 is placed on the lower formwork 7 and pushed up, and then the second and third four
With the port 3-position switching valves 17 and 18 left as they are, the first 4-port 3-position switching valve 16 is switched, and the first pressure reducing valve 20 is similarly connected to the rear cover side of the first hydraulic cylinder 12 of the advancement/retraction device 8. supply relatively high-pressure oil, thereby
The first hydraulic cylinder 12 is extended to bring the upper formwork 6 into contact with the match plate 51, thereby sandwiching the match plate 51 between the upper and lower formworks 6, 7, and the upper and lower formworks 6,
7 is moved to a position corresponding to the model part of the match plate 51. Next, the cylinder 5 is extended and the rotating frame 2 is rotated 90 degrees counterclockwise around the support shaft 3, and the upper and lower formworks 6 and 7 and the match plate 51
, and rotate it from a horizontal position to a vertical position.

Next, as shown in FIG. 2, the third and fourth encoders 40 and 41 control the upper and lower sand blowing devices 23,
24, the third and fourth hydraulic cylinders 36 and 37 are operated to extend, and the upper and lower sand blowing devices 23,
24 into the other ends of the upper and lower formworks 6 and 7 by a required distance to define upper and lower molding spaces corresponding to the height of the model part of the match plate 51, respectively.
Molding sand is blown into the lower mold space by the upper and lower sand blowing devices 23 and 24, respectively, and then the 4 ports 2
By switching the position switching valve 19, the first and second hydraulic cylinders 1
Low-pressure oil is supplied to the rear lid sides of Nos. 2 and 13 to reduce the force of the upper and lower formworks 6 and 7 that clamp the match plate 51. Next, the third and fourth hydraulic cylinders 36 and 37 are further extended to blow the molding sand in the upper and lower mold spaces using the match plate 51, the blow plates 34 and 35 of the upper and lower sand blowing devices 23 and 24, etc. Compress and solidify. In this case, since the force of the upper and lower formworks 6 and 7 that clamps the match plate 51 is small, the match plate 51 and the upper and lower formworks 6 and 7 are moves toward the first hydraulic cylinder 12 side or the second hydraulic cylinder 13 side, and as a result, no unbalanced load is applied to the match plate 51. After the completion of compression of the molding sand is detected by the pressure switches 43 and 44, the fourth and fifth 4-port 3-position switching valves 38 and 39 are switched, and the third and fourth hydraulic cylinders 36 and 37 are operated to contract. - Pull out the tips of the sand blowing devices 23 and 24 from the upper and lower formworks 6 and 7, respectively, and then contract the cylinder 5 to move the rotating frame 2 clockwise around the support shaft 3. The upper and lower formworks 6 and 7 and the match plate 51
Turn down and return to horizontal position.

Next, the 4-port 2-position switching valve 19 and the first
By switching the 4-port 3-position switching valve 16 and supplying pressure oil to the rod cover side of the first hydraulic cylinder 12 of the advancement/retraction device 8, the first hydraulic cylinder 12 is contracted and the upper formwork 6 is raised. The mold is released, and then a transport device (not shown) is transported to a position directly below the match plate 51. Next, by switching the second 4-port 3-position switching valve 17 and supplying pressure oil to the rod cover side of the second hydraulic cylinder 13 of the advancing/retracting device 8, the second hydraulic cylinder 13 is contracted and the lower formwork 7 is and lowering the match plate 51. When these are lowered, the match plate 51 is placed on the conveying device and only the lower mold frame 7 is lowered, thereby releasing the lower mold. Next, the match plate 51 is carried out from between the upper and lower formworks 6 and 7 by the conveyance device, and then the first and second hydraulic cylinders 12 and 13 of the advancement/retraction device 8 are operated to extend in the same manner as described above. Align the upper and lower formwork 6 and 7. Next, the cylinder 49 of the mold receiving device 48 is extended to bring the receiving plate 50 into contact with the lower surface of the mold in the lower mold frame 7, and then the cylinder 46 of the mold extraction device 45 is extended to bring the extraction plate 47 into contact. At the same time, the cylinder 49 is contracted to lower the receiving plate 50, thereby extracting the overlapping upper and lower molds from the upper and lower mold frames 6 and 7. Next, the upper and lower molds on the receiving plate 50 are pushed out onto a mold conveying device (not shown) by a device (not shown), and then the first and second hydraulic cylinders 12, 13 of the advancement/retraction device 8 are pushed out in the same manner as described above. is contracted to raise the upper formwork 6 and lower the lower formwork 7 to complete one cycle.

0012

Effects of the Invention As is clear from the above description, according to the present invention, the upper and lower formworks are moved while detecting the advancing and retreating distances using the first and second encoders, and the third and fourth encoders are used to move the upper and lower formworks. By moving the upper and lower sand blowing devices while detecting the advancing and retreating distances, the match plate and upper and lower formwork are moved to positions corresponding to the height of the match plate model, and the match plate model is also moved to a position corresponding to the height of the match plate model. Upper and lower molding spaces corresponding to the height of the upper and lower molding spaces are defined, molding sand is blown in, and the molding sand is further compressed to form upper and lower molds. When compressing the match plate, in order to reduce the force of the upper and lower molds that hold the match plate in place, the match plate moves in response to the difference in force acting on the front and back sides of the match plate. has excellent effects such as no unbalanced load being applied.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, showing the state before molding.

FIG. 2 is a partial sectional front view showing an embodiment of the present invention, and shows the state during mold manufacturing.

FIG. 3 shows a view taken along the line AA in FIG. 2 and a diagram of a hydraulic circuit connected thereto.

[Explanation of symbols]

1 Machine base 2 Rotating frame 6 Upper formwork 7 Lower formwork 8 Advancement/retraction devices 12, 13, 36, 37 First to fourth hydraulic cylinders 1
4, 15, 40, 41 first to fourth encoders 16,
17, 18, 38, 39 First to fifth 4-port 3-position switching valves 19 4-port 2-position switching valves 20, 21 1st and 2nd pressure reducing valves 22 Hydraulic pressure generation source 23 Upper sand blowing device 24 Lower sand blower Loading device 42 Control devices 43, 44 Pressure switch 45 Mold extraction device 48 Mold receiving device 51 Match plate

Claims (1)

[Claims] Claim 1: A rotary frame 2 is mounted on a machine base 1 so as to be rotatable up and down by 90 degrees in a vertical plane, and the rotary frame 2 is provided with a rotary frame 2 which is in a vertical state when rotated upward by 90 degrees. The upper and lower formworks 6 and 7, which become horizontal when rotated downward by 90 degrees, are made to face each other and can be moved forward and backward through the first and second hydraulic cylinders 12 and 13 of the forward and backward movement device 8. Further, first and second encoders 14 and 15 for detecting the advancing and retreating distances of the upper and lower formworks 6 and 7, respectively, are mounted on the rotating frame 2, and the frame is rotated downward. A match plate 51 is placed in and out between the upper and lower formworks 6 and 7 which are in a horizontal state, and the match plate 51 is held between the front and back surfaces and is pivoted upward to be in a vertical state. The tips of upper and lower sand blowing devices 23 and 24 are installed in and out of the openings at the other ends of the upper and lower formworks 6 and 7, respectively. Third and fourth hydraulic cylinders 36 and 3 that move the sand blowing devices 23 and 24 forward and backward relative to each other.
7 and third and fourth encoders 40 and 41 for detecting the advancing and retreating distances of the upper and lower sand blowing devices 23 and 24, and furthermore, a mold is built in and the molds are aligned with each other and rotated downward. The upper and lower formworks 6 and 7 are in a horizontal state.
A mold extraction device 45 and a mold receiving device 48 are disposed nearby, and the two first and second hydraulic cylinders 12 and 13
are connected to the first and second 4-port 3-position switching valves 16 and 17, respectively, and the first and second 4-port 3-position switching valves 16 and 17 are connected to the third 4-port 3-position switching valve. 18, 4
Port 2-position switching valve 19 and two first and second valves installed in parallel.
The third and fourth hydraulic cylinders 36 and 37 are connected to the hydraulic pressure generation source 22 through the second pressure reducing valves 20 and 21 in sequence, and the third and fourth hydraulic cylinders 36 and 37 are
It is connected to the outlet side of the third 4-port 3-position switching valve 18 via a fifth 4-port 3-position switching valve 38, 39, and the first to fourth encoders 14, 15, 40, 41 are connected to a control device. 42 through the first, second and fourth and fifth 4
It is electrically connected to the electromagnets of the port 2-position switching valves 16, 17, 38, and 39, respectively, and the rear cover of the third and fourth hydraulic cylinders 36 and 37 and the fourth and fifth 4-port 3-position switching valves. 38 and 39, pressure switches 43 and 44 are respectively disposed.