JPS6245016B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frameless mold making device that uses match plates and creates a frameless mold by squeezing pressure applied thereto. This invention relates to a frameless mold making device that is improved so that a molding space formed by fitting a squeeze plate into a frame can be set to an appropriate size by adjusting the amount of fit of the squeeze plate.

The upper and lower formworks are brought into contact with each other from both sides by sandwiching a mate plate having a model on both sides or at least one side,
A squeeze plate is inserted by a set amount from the back of each of the upper and lower formworks to form a closed molding space, and the molding space is filled with molding sand using the action of pressurized air. After that, a mold is formed by squeezing with a large pressing force of both the squeeze plates, and a frameless mold is obtained by punching the mold from the upper and lower mold frames. Methods and devices have already been provided in the past, in which in the squeezing step of squeezing foundry sand, one of the squeeze plates is fixed and the other squeeze plate is advanced toward the fixed squeeze plate while compressing the foundry sand. At this time, in order to prevent the match plate from breaking, a formwork moving device that biases the upper and lower formwork in a direction that clamps the match plate is placed against the machine frame of the mold making equipment. The mold moving device is arranged in an independent and free state, and is configured to be able to move integrally with the upper and lower molds and the match plate during molding sand compression, thereby preventing shearing force applied to the match plate. Frame type mold making equipment is also already available. However, in such conventional frameless mold making equipment, each molding part is configured under the condition that the thickness of the matte plate with the model is generally fixed within a relatively narrow dimensional range. has been done. Therefore, due to the wide variety of model types, the thickness of the match plate does not necessarily stay within the above-mentioned fixed dimension range, and when there are many different thicknesses and thinner types, the positions of the upper and lower formwork when clamping them will also change. Therefore, if the amount of forward movement of the squeeze plate to fit into the upper and lower formwork is fixed regardless of the thickness of the squeeze plate, a large difference in the width of the molding space will occur, making it difficult to properly It becomes impossible to manufacture a mold with a suitable degree of compaction of foundry sand and appropriate thickness, and the functional versatility of the equipment is greatly reduced.

Therefore, the object of the present invention is to eliminate such disadvantages,
The upper and lower formwork always approach each other by the same amount at the same time from fixed positions separated from each other, thereby clamping the match plate at the center position between the upper and lower formwork. Even when the thickness of the plate is different, the top of the squeeze plate can be
A frameless mold making system that adjusts the volume of the molding space appropriately by presetting and controlling the amount of movement toward the lower mold, making it possible to always produce molds with the appropriate thickness and degree of compression. The aim is to provide the equipment.

That is, according to the present invention, a pair of upper and lower formworks are supported by a guide shaft member so as to be slidable in the axial direction, and the upper and lower formworks are arranged at mutually separated positions and at the center of both positions. a formwork moving device that controls simultaneous movement toward and from the molding position, and a mating plate provided so as to be clamped between the upper and lower molds at the molding position; Above mentioned
1 that can be inserted into both formworks from each back side of the lower formwork.
a pair of squeeze plates; a squeeze plate movement control means for independently setting and controlling the amount of movement of each of the pair of squeeze plates into the corresponding formwork; There is provided a frameless mold making apparatus characterized by comprising a molding sand supply device for filling the upper and lower mold flasks with molding sand. Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

FIG. 1 is a front view showing the mechanical structure and arrangement of an embodiment of the device according to the present invention. In the figure, a machine frame 3 is erected on a base 2 placed on a floor 1, and a tilted frame 4 is tilted at 45 degrees with respect to the floor 1 by the base 2 and the machine frame 3. It is supported by
A formwork device 5 is attached to the inclined frame 4, and is rotatable about an axis having an angle of inclination of 45 degrees with respect to the horizontal, perpendicular to the inclined surface of the inclined frame 4. It is a rotation axis. The rotation of the formwork device 5 is performed by a hydraulic cylinder device 9 suspended between a post 7 fixed to the bottom of the device 5 and a post 8 fixed to the top surface of the tilt machine frame 4. The structure is such that the rotation can be repeated over a constant rotation angle. The above-mentioned formwork device 5 has both hems 1 of the chevron base 10.
1 and 12, respectively, relative to the rotation axis.
Guide means 13, 14 are provided with an angle of inclination of 45°. The guide means 13, 14 can most simply be formed by two parallel rods. The guide means 13 and 14 are connected to upper and lower formworks 16 and 17 via frame stands 15, respectively.
18, 19 are slidably attached, and the sliding movement of these upper and lower formworks 16, 17 and 18, 19 is representatively illustrated for the upper and lower formworks 16, 17 in FIG. As shown in FIG. 2, the piston rod 20 is common and the movable cylinder parts 21 and 22 are fixed to the upper and lower molds 16 and 17, respectively, by the operation of the hydraulic cylinder device 23 for moving the molds.
The lower formwork is moved towards or away from each other. In this case, the piston rod 20 is
4 is always pulled toward the outside of the lower formwork 17 and fixed to the hem 11 of the formwork device 5 under pressure, and only when an external force greater than the spring force of this spring 24 operates, the cylinder Both parts 21 and 22 move in opposite directions by appropriate amounts. It should be noted that although the upper and lower formworks 16, 17 and 18, 19 are arranged on separate guide means 13 and 14, the other structures are formed exactly the same for both forms, and therefore the above-mentioned Hydraulic cylinder device 23 for lower formwork 16, 17
A hydraulic cylinder device for moving the formwork similar to that shown in FIG.
A configuration is adopted in which the spring shown at 5 is always pressed and fixed in the direction of the hem portion 12. Further, the guide means 13 and 14 are both connected to the respective upper formworks 16 and 1.
The ends on the 8 side are supported by respective supports 26, 26 movably supported by columns 6' projecting from the top of the chevron-shaped base 10 concentrically with the shaft 6, respectively. These two guide means 13 and 14 are for rotation of the mold device 5 described above, and are used for forming a frameless mold (hereinafter referred to as a station) and a frameless mold punching station (hereinafter referred to as a station). ), and in FIG. 1, the guide means 13 is located at the station (at this time, the guide means 13 is approximately horizontal), and the guide means 14 is located at the station (at this time, the guide means 1 is located at the station).
4 is almost perpendicular to the floor 1. ) is located in In the above-mentioned station,
Located between the lower formwork 16, 17 or 18, 19,
Moreover, a match plate 27 having model surfaces on both sides is normally arranged in the vertical direction, and the match plate 27 is formed so as to be able to move a certain amount in the horizontal direction along a horizontal guide rod (not shown). There is. A pair of squeeze devices 28 and 29 are also arranged in the station, which are held by the machine frame 3 and are arranged outside the upper and lower formworks 16 and 17 concentrically with the upper and lower formworks 16 and 17. , both squeeze devices 28, 29 move forward toward the approximate center position of the station where the match plate 27 hangs, and the squeeze plate 28 moves back from there.
a, 29a, respectively, and guide rods 30, 31 are provided at the rear for guiding the respective squeeze plates 28a, 29a forward and backward in a straight line. The squeeze devices 28, 29 themselves are configured to move the squeeze plates 28a, 29a back and forth by the operation of separate fluid pressure cylinder devices, and therefore both squeeze devices 28, 29 are configured to move the squeeze plates 28a, 29a back and forth by the operation of separate fluid pressure cylinder devices. It is also possible to individually control the amount of forward and backward movement of the squeeze plates 28a and 29a by independently operating the squeeze plates 28a and 29a. 16, 17 or 1
It is also possible to stop the squeeze plates 28a, 29a at a position where both squeeze plates 28a, 29a are inserted a certain amount from behind in the 8, 19, and a fluid pressure control circuit for a fluid pressure cylinder device that achieves such control is already known to those skilled in the art. This is something that I am very familiar with. However, in the present invention, in front of both squeeze plates 28a and 29a,
Squeeze plate movement detecting means 32 and 33, which will be described later, are provided to accurately detect the amount of backward movement and to enable the forward and backward movement amounts of both squeeze plates 28a and 29a to be properly set in advance.
In the embodiment shown in FIG. 1, 2 and 33 are guide rods 30,
It is formed by detection plates 34, 35 attached to 31 and detectors 36, 36, 37, 37 provided on machine frame 3. Although not shown in FIG. 1, the squeeze plate 28a for the upper mold is usually provided with a sprue model, a riser model, and the like. Now, in the station, a molding sand supply device 38 for supplying molding sand into the upper and lower mold frames 16, 17 or 18, 19, respectively, is held by a fixed support frame 39 held on the machine frame 3. The molding sand supply device 38 has a molding sand supply hopper 41 that moves up and down by the operation of a pair of hydraulic cylinder devices 40, 40.
moves downward when supplying molding sand to the upper and lower formworks 16, 1.
Molding sand is supplied into the upper and lower formworks in close contact with the molding sand inlets 43, 44 or 45, 46 of 7 or 18, 19 without leaking, and after the supply is completed, the fluid pressure cylinder devices 40, 40 are operated again. It moves upward away from the upper and lower formwork. In addition, since the hopper 41 moves up and down at a fixed position, its molding sand supply port is
The station is always in a fixed position on the horizontal axis of the molding sand inlets 43, 44 or 45, 46 of the upper and lower formworks 16, 17 or 18, 19, which are close to each other at the position where the match plate 27 is held. It is located in For this reason, when the thickness of the match plate 27 varies as described later, the upper and lower formworks 16, 17 or 18 that sandwich them,
Even when the molding sand inlets 43, 44 or 45, 46 of No. 19 are shifted on the horizontal axis, the molding sand inlets 43, 44 or 45,
It is necessary that the sand channel is in reliable communication with 46. Therefore, the upper and lower formwork 1 of the device according to the invention
The molding sand inlets 43, 44 or 45, 46 formed in 6, 17 or 18, 19 have a wide shape in advance at the station so that they can face the molding sand supply port of the hopper 41 even when the above-mentioned deviation occurs. It is formed as a mouth with a. Of course, for these wide molding sand inlet ports 43, 44 or 45, 46, the molding sand supply port of the hopper 41 is provided with appropriate sealing means such as a sealing flange around the molding sand inlet ports 43, 44 or 45, 46, so that the molding sand inlet ports 43, 44 or 45, 46 are provided with appropriate sealing means such as a sealing flange, etc. This prevents molding sand from leaking to the outside.

On the other hand, as shown in FIG. 1, the station, that is, the frame punching station for frameless molds, is equipped with upper and lower molds 18 and 19 by a hydraulic cylinder device located below the upper and lower molds 18 and 19 at positions aligned with their axes. A horizontal receiving plate 47 is provided which is movable downward and can be fitted into the lower frame 19 from below to receive the mold in the lower frame 19. Similarly, a frame punching plate 48 is disposed at a position aligned with the axes thereof and can be moved up and down by a fluid pressure cylinder device and fit into the upper and lower formworks 18 and 19. That is, at the station, the upper and lower mold frames 18 and 19 having the molds formed at the station are matched along the guide means by the operation of the fluid pressure cylinder device having the common piston described above, and these molds are matched. The horizontal receiving plate 47 is raised directly below the upper and lower formworks 18 and 19, and then the frame punching plate 4 is placed from above.
8 is lowered, the molds in the upper and lower mold frames 18 and 19 are received on the horizontal receiving plate 47, so that the molds punched out in this way can be sent to the next process. It is being done. Of course, it is possible to insert a core and inspect the mold when matching the upper and lower mold frames 18 and 19, as in the conventional flaskless mold apparatus of this type. Further, the above-mentioned horizontal receiving plate 47 and frame punching plate 48 perform mold matching and frame punching operations in the same way when the other pair of upper and lower formworks 16 and 17 arrive at the station after molding. Needless to say, the mold can then be sent to the next process, that is, the casting process.

Next, FIG. 3 is a partially enlarged mechanical diagram for explaining the specific structure and operation of the embodiment of the squeeze plate movement detection device described above in the structure of the station. Although this is a representative example of the squeeze plate movement detection device 32 provided, it is understood that the squeeze plate movement detection device 33 provided in the lower mold squeeze device 29 has approximately the same configuration. be able to. Now, in FIG. 3, the squeeze device 28 has its squeeze plate 28a coupled to the piston rod 50 of the fluid pressure cylinder device 49 as described above.
When the piston rod 50 moves forward, the squeeze plate 28a moves forward, and when the piston rod 50 retreats into the cylinder chamber of the fluid pressure cylinder device 49, the squeeze plate 28a also moves backward. At this time, the guide rod 30 guides and slides the squeeze plate 28a along the guide sleeve 51 fixed to the machine frame 3, so that the squeeze plate 28a can smoothly and linearly move forward and backward. A detection plate 34 of a detection device 32 is fixedly attached to the rear end of the guide rod 30, and moves in the front-rear direction (left and right directions in FIG. 3) together with the squeeze plate 28a and the guide rod 30. This detection plate 34 has a plurality of protruding teeth 3 at equal pitches.
4a are formed, and these protruding teeth 34a cooperate with detectors 36 and 37 fixed to the machine frame 3 to perform a detection operation. That is, the detector 36 is provided to detect the rear end limit of the squeeze plate 28a. For example, among the plurality of protrusions 34a formed on the detection plate 34, the rightmost protrusion 34a in FIG. When the squeeze plate 28a moves backward to a position facing the detection end 36a, a detection signal is sent out. Further, the detector 37 detects the amount of forward movement of the squeeze plate 28a, and the detection end 37 of the detector 37 detects the amount of forward movement of the squeeze plate 28a.
A digital signal is emitted each time the plurality of protrusions 34a of the detection plate 34 pass sequentially through a, and when the plurality of protrusions 34a pass, a plurality of pulse signals are ultimately emitted from the detector 37. The two-dot chain line in FIG. 3 shows that the protruding tooth 34a of the detection plate 34 is
7 shows how it passes through the detection end 37a of No. 7. The detectors 36 and 37 described above are connected to a squeeze plate control device 52 that includes a counter and a cylinder control section, and when the signals of the detectors 36 and 37 are counted up to a preset count value in the counter, the cylinder control is performed. If the hydraulic cylinder device 49 is stopped by driving the squeeze plate 28a, the movement of the squeeze plate 28a can be appropriately controlled. In other words, the detection plate 34 and the detector 36,
The detection device 32 consisting of 37 and the squeeze plate control device 52 form an embodiment of the squeeze plate movement amount control means. It goes without saying that the squeeze plate control device 52 also includes an operating means for starting the operation of the fluid pressure cylinder device 49. Furthermore, the specific configuration of the detectors 36 and 37 may be appropriately selected from well-known proximity switch devices, phototubes, etc., and the number of teeth, pitch, etc. of the protruding teeth 34a of the detection plate 34 will depend on the accuracy of the stop position of the squeeze plate 28a. Needless to say, the design can be appropriately increased or decreased depending on the range of change in the stop position.

FIG. 4 shows the fluid pressure cylinder devices 23 of the upper and lower formworks 16 and 17, the fluid pressure cylinder devices 53 of the upper and lower formworks 18 and 19, and the fluid pressure cylinder devices 49 and 54 of the squeeze devices 28 and 29, respectively. FIG. 3 is a pressure fluid circuit diagram for operation. In the same circuit diagram, A ₁ is a directional control valve provided between a pressure fluid pump K and a fluid pressure cylinder device 23 having pressure cylinders 21 and 22 disposed on the common piston 20, and A ₂ is also a directional switching valve provided between the fluid pressure cylinder device 53 and the pressure fluid pump K; B and C are directional switching valves for the squeezing fluid pressure cylinder devices 49 and 54, respectively;
D is the pressure cylinder 2 of the fluid pressure cylinder device 23
1 and 22 are separated from each other, they always reach a certain separation position and stop, and also actuate the fluid pressure cylinder device 53 in the same manner. E and F are fluid pressure cylinder devices, respectively. This is a speed control switching valve that adjusts the operating speed of 49 and 54. G is a pressure regulating valve for setting the liquid pressure co-supplied to the fluid pressure cylinder device 23 or 53 at a relatively low pressure during the mold release operation, and H and I are the fluid pressure cylinder devices 49 and 54, respectively, during the mold release operation. This is a throttle valve that controls the operating speed of the valve.
Further, J is a mold release operation switching valve. Regarding the pressure fluid circuit having the above-mentioned configuration, an approximately equivalent circuit configuration is disclosed in Japanese Patent Application Laid-Open No. 56-50761, which is an earlier application of the present applicant regarding a frameless mold making device. In contrast, the pressure fluid circuit according to the embodiment of the invention described above is a fluid pressure cylinder device 2 having a pair of pressure cylinders on a common piston rod.
By providing the correction valve D for 3 and 53, when these pair of pressure cylinders are moved back to separate positions, they are always moved back to a certain distance position as described above. Therefore, when both move forward toward each other on the common piston rod again, the forward motion is started from these fixed separated positions, which is a major feature, and as will be described later. It is possible to obtain the following effects.

The operation of the flaskless mold manufacturing apparatus of the present invention having the configuration shown in FIGS. 1 to 4, particularly the operation and effect of the molding station, will be described below.

When the upper and lower formworks 16 and ₁₇ are in the station as shown in FIG. The pressurized fluid in chamber b of 21 is supplied to chamber a of pressure cylinder 21, and the upper and lower formworks 11 and 12 approach each other from a certain retreated position and clamp the match plate 27 from both sides to maintain this state. . At this time, the pressure cylinders 21 and 22 have cylinder shapes with the same diameter on the common piston rod 20 and have the same pressure surface, so they always operate by the same amount, so the upper and lower formworks 16, 17 also moves forward by the same amount from the above-mentioned fixed retreat position, and reaches a position where it clamps the match plate 27. In other words, even if the plate thickness of the match plate 27 changes in size, it will change depending on the upper and lower formwork 16,
It will definitely be clamped at the center position between the 17 fixed retreat positions. Next, speed control switching valves E and F
are set to the a position, and the mold release operation switching valve J is energized to switch the direction switching valves B and C to the a position, respectively, and pressurized fluid is supplied from the pump K to the a chambers of the fluid pressure cylinder devices 49 and 54, respectively. The squeeze plates 28a, 29a are moved forward at a relatively high speed, and just before the squeeze plates 28a, 29a are fitted into the upper and lower formworks 16, 17, respectively, the speed control switching valves E, F are set to neutral positions, and the squeeze plates 28a, 29a are moved forward at a relatively high speed. 28a and 29a are moved at a relatively low speed, and when the squeeze plates 28a and 29a are fitted into the upper and lower formworks 16 and 17 by a set amount, respectively, the directional control valves B and C are switched to the neutral position and returned. make it stop. In this state, the inlet ports 43 and 44 are
Fill the molding space with molding sand. Now, in the above-mentioned operation process, according to the present invention, the amount of movement of the squeeze plates 28a, 29a is detected by the squeeze plate movement detection devices 32, 33, and the squeeze plates 28a, 29a are moved to a preset position.
When a and 29a move forward, the directional control valves B and C are activated by a signal from the squeeze plate movement control device 52.
By switching between the two, it is possible to precisely stop at the target position. Therefore, the match plate 27 is replaced due to a change in the mold pattern, etc., and as a result, the thickness of the match plate 27 is changed, so that the upper and lower mold frames 16 and 17 that clamp the match plate 27 are replaced. Even if the absolute position on the guide means 13, that is, the position where both formworks 16 and 17 move forward from the fixed retracted position and the match plate 27 is clamped between them, changes, the thickness of the match plate may be changed in advance. By selecting and setting the amount of movement of the squeeze plates 28a, 29a according to the difference, a constant amount of molding sand can be supplied into the upper and lower formworks 16, 17, regardless of the thickness of the squeeze plates 27. This makes it possible to secure a molding space with a fixed volume. Now, when the filling of the molding sand is completed, in the above-mentioned state, only the directional control valve C is switched to the a position, and the squeeze plate 29a is moved forward while the squeeze plate 28a is kept fixed, so that the molding sand is filled into the molding space. Sand compaction (squeeze)
Do this. At this time, the pressing force by the squeeze plate 29a is applied to the molding sand in the lower mold frame 17 and the molding sand in the upper mold frame 16 via the match plate 27, and both molding sands are compressed at the same time. This is done by moving the upper and lower formworks 16 and 17 together with the match plate 27 in the direction of the fixed squeeze plate 28a while resisting the spring force of the spring 24. Furthermore, since the upper and lower formworks 16 and 17 move horizontally together with the match plate 27 while holding the match plate 27 under pressure due to the operation of the fluid pressure cylinder device 23, shearing force is not applied to the match plate 27. Since it costs almost nothing, there is no risk of damage occurring. In addition,
The amount of movement of the squeeze plate 29a for compressing the foundry sand can also be controlled by a signal from the movement amount detection device 33. By switching the directional control valve C to the neutral position based on this detection signal, it is also possible to control the end of the compression operation.
When the compression is completed, the directional control valve A ₁ is set to the neutral position, and the mold release operation switching valve _J is de-energized to perform the mold release operation at a very low speed.
, the directional control valves B and C are in the b position, respectively.
Then, the speed control valves E and F are respectively switched to the b position to separate the upper and lower formworks 16 and 17 and to retract the squeeze plates 28a and 29a, respectively. At this time, squeeze plate 28a,
When the machine frame 29a is moved backward, the preset backward limit is again detected by the squeeze plate movement detecting means 32, 33, so that the machine frame 3 can always be stopped at a desired backward limit position. Furthermore, upper and lower formwork 1
6 and 17, the fluid pressure circuits are formed so that the pressure cylinders 21 and 22 of the fluid pressure cylinder device 23 are retracted to a certain distance, as described above.
That is, in the fluid pressure circuit of FIG. 4, the directional control valve _A1 is switched to the b position, pressure fluid is supplied to the b chamber of the pressure cylinder 21,
As the pressure cylinder 21 retreats, pressure fluid is sent from the a chamber to the b chamber of the pressure cylinder 22, and in the process in which the pressure cylinder 22 also retreats in synchronization, the pressure cylinder 21 receives the pressure fluid supplied from the pump K. If the other pressure cylinder 22 has not yet reached the retreat limit at the time when the other pressure cylinder 22 has moved backward until it reaches the retreat limit, the pressure cylinder 21 will be in the b chamber of this pressure cylinder 22.
Pressure fluid can no longer be supplied from the chamber, but the compensation valve D has been switched from position b to position a at that point, and pressure fluid is supplied from pump K via compensation valve D. Ultimately, it is guaranteed that both pressure cylinders 21 and 22 will move backward to the predetermined backward limit position. Note that the timing when the correction valve D is switched from the b position to the a position is the timing when the other fluid pressure cylinder device 53 is also in the operating process in which its pair of movable cylinders are separated, that is, when the upper and lower formworks 18, After completing the mold matching and frame cutting process in step 19, both molds 18 and 1 are
9 is selected to separate the two movable cylinders of the fluid pressure cylinder device 53, it becomes possible to reliably move the two movable cylinders of the hydraulic cylinder device 53 backward to the backward limit. In this way, after the upper and lower formworks 16, 17 and 18, 19 are all retracted to a predetermined distance from each other at both stations, the formwork device 5 is rotated through 180 degrees. That is, when the molding process using the pair of upper and lower formworks 16 and 17 is completed at the station as described above, the formwork device 5 is
The upper and lower mold frames 16 and 17 are moved to the station, the mold is inspected and the core is inserted, and then the hydraulic cylinder device 23 is operated to align the molds, and the press plate is moved to the station. The frame is punched out by the pressing force of 48, and the mold is placed on the receiving plate 47 in the raised position and sent to the next process. Note that the upper and lower formworks 18 and 19, which were moved from station to station during this period, are
The same molding process as in the case of the lower formworks 16 and 17 proceeds.

As is clear from the above description, according to the present invention, a configuration is adopted that ensures that the upper and lower formwork always retreat to their respective fixed distance positions separated from each other, and By approaching each other by the same amount at the same time, the match plate is always clamped at the center position of the upper and lower formworks, and then the amount of movement of the squeeze plate toward the upper and lower formworks is controlled in advance. Therefore, even when the thickness of the match plate is different, by controlling the above-mentioned setting of the amount of movement of the squeeze plate, the molding space for filling with foundry sand can be adjusted and controlled to have an appropriate volume value or an appropriate space width. This allows the mold thickness and degree of compression to be maintained at an appropriate level at all times. Also,
Conversely, even if the thickness of the match plate remains the same but the thickness of the model held on the match plate differs, the squeeze plate may be moved and fitted into the upper and lower formwork to form the modeling space. By changing the amount of movement of the squeeze plate, for example, when making a relatively thick model, set the amount of movement of the squeeze plate to fit into the upper and lower mold frames in advance to be smaller, thereby increasing the width of the modeling space. This can prevent the mold thickness from becoming too thin and becoming brittle.
On the other hand, if the model thickness is thin, the mold thickness can be reduced accordingly to achieve an appropriate mold thickness and to save molding sand.

In the embodiment described above, two sets of upper and lower formwork are alternately moved between the molding station and the frame-cutting station by a formwork device that rotates on the frame surface of the inclined frame inclined at 45 degrees with respect to the floor surface. However, the present invention is not limited to embodiments having such a configuration, and the present invention is not limited to the embodiments having such a configuration. The same can be applied to embodiments in which the structure moves repeatedly between the two.

5 and 6 are front views showing the mechanical structure of an embodiment having such a structure, and FIG.
A pair of upper and lower formworks are shown in a matching and blanking station, and FIG. 6 shows a pair of upper and lower formworks in a forming station. Same 5th
In the drawings and FIG. 6, symbol indicates a molding station, and symbol indicates a die-setting and frame-cutting station. Now, a pair of upper and lower formworks 60 and 61 are provided so as to be able to approach and separate from each other on a guide means 63 consisting of one or more guide rods. As in the previous embodiment, the approaching and separating operations are performed by a fluid pressure cylinder device consisting of two pistons and two movable pressure cylinders, which are not shown in the figure but are separately arranged on a common piston rod. Moreover, both frames 60 and 61 approach each other by the same amount at the same time from a fixed retracted position separated from each other, and move away by the same amount at the same time from the approach position. The above-mentioned upper and lower formworks 60, 61, guide means 63, hydraulic cylinder device for moving the formwork, etc. are held horizontally by appropriate holding means on a device frame 58 that is erected on a floor surface 57. The station is configured to be able to rotate repeatedly approximately every 90 degrees around a rotating shaft 64, and the stopping position of the station is as follows.
The stop position at the station is set by a part of the guide means 63 on the upper formwork 65 side coming into contact with a stopper 67 fixed to the machine frame 58, and the stopping position at the station is set by a part of the guide means 63 on the lower formwork 61 side. is set by coming into contact with a stopper 68 which is also fixed to the machine frame 58. FIG. 5 shows a stopped state in the station, and at this time, the center lines of the upper and lower formworks 60, 61 are in the vertical direction. Moreover, FIG. 6 shows a stopped state at the station, and at this time, the upper and lower formworks 60, 6
The center line of 1 is in the horizontal direction. The station is provided with a pair of squeeze devices 69 and 70 held in the machine frame 58, and the specific configurations of these squeeze devices 69 and 70 are approximately the same as the squeeze devices 28 and 29 in the previous embodiment, and each It has squeeze plates 69a and 70a, and these squeeze plates 69a and 70a move forward and fit into the upper and lower formworks 60 and 61 from the rear of each of the upper and lower formworks 60 and 61 stopped at the station along coaxial lines. During molding, the molding space can be formed and the molding sand can be squeezed, and after the molding operation is completed, the molding can be retracted to the retracted position shown in FIG. These squeeze plates 69a,
The forward and backward movements of 70a are performed by the squeeze device 69,
This is accomplished by a hydraulic cylinder device built into each of the 70. Also in this embodiment, the detectors 71, 71, 72, 72 provided on the machine frame 58
The amount of movement of the squeeze plates 69a, 70a is detected by the detection plates 73, 74 having protrusions provided on both the squeeze devices 69, 70, and the detection signals are used to detect the movement of the squeeze plates 69a, 70.
By providing a squeeze plate movement control means for controlling the operation stop of the squeeze plate 6
The amount of movement of the squeeze plates 69a, 70a can be set in advance, and the squeeze plates 69a, 70a can be configured to stop accurately when the set amount of movement is reached.
It is also possible to accurately set the final retracted position of 70a.

The station is also provided with a molding sand supply device 75 held in the machine frame 58, and when the upper and lower mold frames 60 and 61 are stopped at the station and the molding operation is performed, the upper and lower mold frames 60 and 61 are The molding sand supply ports 76 and 77 fill the molding space with molding sand. Foundry sand supply port 76 in this case,
Similarly to the previous embodiment, 77 also has upper and lower formworks 60,
61 is formed wide on the circumferential surface. Further, in this embodiment, the match plate 78 is placed on a match plate holder 79, and this match plate holder 79 is moved by the arrow "M" in FIG. 5 by a match plate moving cylinder 80 provided near the station. ”
As shown in the figure, it is configured to face into the station and retreat from there. Therefore, the match plate 78 is held at the station by the upper and lower mold frames 60 and 61 being moved closer together after the mold cutting process is completed, and the match plate 78 is held between them.
It rotates from station to station while holding 8 in its grip. In this case, if the thickness of the match plate 78 is different, the mutual distance between the upper and lower formworks 60 and 61 that are held between them will change, but as described above, the present invention According to the squeeze device 6 in the station
Since the amount of movement of the squeeze plates 69, 70a of 9, 70 can be set in advance and it is possible to stop them accurately at the set position, the squeeze plates 69a, 70a can be adjusted in response to variations in the thickness of the match plate 78. By changing the setting of the amount of movement, the molding space can be set to an appropriate space thickness as already described in detail in the previous embodiment, and a flaskless mold having an appropriate thickness and degree of compression can be obtained. Conversely, even if the thickness of the match plate 78 remains unchanged but the thickness of the model differs in size, the squeeze plate 69a,
By correspondingly changing the setting of the displacement amount of 70a, it is possible to adjust and ensure an appropriate mold thickness and degree of compression. In addition, in Figures 5 and 6,
Reference numeral 81 denotes a receiving plate that receives the mold during the frame punching process, and is provided so as to be movable up and down by a fluid pressure cylinder device provided below the floor surface 57. Reference numeral 82 denotes a frame punching device, which presses the molds in the upper and lower mold frames 60, 61 after mold matching from above using a fluid pressure cylinder device, punches the molds onto the receiving plate 81, and removes the molds from above. It operates to make you accept. The upper and lower molds, which have been cut out and placed on the receiving plate 81, are transferred to the delivery rod 84 of the mold delivery device 83 provided in the machine frame 58.
The upper and lower molds are pushed out toward the mold transport table 85, and then sent from the mold transport table 85 to the next process.

As described above, the present invention is an embodiment of a frameless mold making apparatus having a configuration in which a pair of upper and lower molds rotates around a horizontal axis and repeatedly moves between a molding station and a mold matching frame punching station. However, if the setting of the displacement of the squeeze plate is changed according to the thickness of the squeeze plate, the desired purpose can be achieved.Moreover, this setting change operation can be achieved by a simple operation such as changing the counter setting, so the present invention is effective. The device has the advantage that its functions are sufficiently versatile.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the mechanical configuration of an embodiment of the frameless mold making apparatus according to the present invention, FIG. Figure 3 is a mechanical diagram showing the configuration of the squeeze plate movement amount control means provided in the same device for one squeeze plate device;
Fig. 4 is a fluid pressure circuit diagram of the same device, Figs. 5 and 6 are front views showing the mechanical configuration of other embodiments of the present invention, and Fig. 5 shows the upper and lower formwork at the frame-cutting station. In one case, FIG. 6 shows a case where the upper and lower formworks are at the molding station. 2... Base, 3... Machine frame, 5... Formwork device, 1
3,14...guiding means, 15...frame stand, 16,1
8... Upper formwork, 17, 19... Lower formwork, 20...
Piston rod, 21, 22...Movable cylinder part, 23, 53...Fluid pressure cylinder device for moving the formwork, 24, 25...Spring, 27...Match plate, 28, 29...Squeeze device, 28a, 2
9a...Squeeze plate, 32, 33...Squeeze plate movement detection means, 34, 35...Detection plate, 36, 37...Detector, 34a...Protrusion tooth, 3
8... Foundry sand supply device, 43, 44, 45, 46
... Foundry sand introduction hole, 52 ... Squeeze plate control device, 60 ... Upper formwork, 61 ... Lower formwork, 6
9, 70... Squeeze device, 71, 72... Detector, 73, 74... Detection plate, 78... Match plate.

Claims (1)

[Claims] 1. 1 supported by a guide shaft member so as to be slidable in the axial direction.
Formwork movement that controls a pair of upper and lower formworks and the upper and lower formworks to be simultaneously moved toward each other and returned simultaneously between their respective mutually separated positions and a molding position in the center of both positions. a device, and the above-mentioned upper and
a match plate provided so as to be pinched between the lower formwork; a pair of squeeze plates that can be fitted into the upper and lower formworks from the respective back sides of the upper and lower formwork; A squeeze plate movement control means for independently setting and controlling the amount of movement of the squeeze plates into the respective corresponding formworks; 1. A frameless mold making device comprising a molding sand supplying device for filling the mold. 2. In the frameless mold making apparatus according to claim 1, the mold movement device accommodates a pair of identical pistons separately provided on one stationary shaft rod and each piston of the pair. a pair of movable cylinders having the same diameter and the same length; and a pair of movable cylinders having the same diameter and the same length;
A pair of formwork stands that hold a pair of upper and lower formwork, and a working fluid circuit that simultaneously supplies working fluid to one cylinder of the pair of movable cylinders and simultaneously supplies the same amount of working fluid to the other cylinder. and a correction circuit means provided in the working fluid circuit to correct the amount of fluid in the corresponding working fluid chambers of the pair of movable cylinders to a constant amount. 3. In the frameless mold making device according to claim 2, the stationary shaft rod of the mold moving device is pressed and held at a constant fixed position by the elastic biasing force of the elastic means, and the 1. A frameless mold making device which is provided so as to be forcibly movable against an urging force, and wherein the match plate is also held movably in the same direction as the stationary shaft rod. 4 Any one of claims 1 to 3
In the frameless mold making apparatus according to item 1, the squeeze plate movement amount control means includes a digital signal forming device that generates a digital signal every time each squeeze plate moves a certain amount, and a digital signal forming device that counts and calculates the digital signals. A frameless mold making device comprising a counting means that generates a squeeze plate stop signal when a numerical value reaches a preset value.