JP2023128338A - Sand cutter for cutting of casting mold - Google Patents

Abstract

To provide a sand cutter for cutting of a casting mold which enables sand cutting of a cavity opposing surface of a raised cast molding, which is higher than a height of a metal frame, to an arbitrary height.SOLUTION: A sand cutter for cutting of a casting mold performs sand cutting of a cavity opposing surface of a raised casting mold which is raised to a level higher than a height of a metal frame and molded. The sand cutter includes a sand cut mechanism 14 having a cutter holder 20 attached with a cutter blade 26, a cutter holder lift actuator 19 which moves up or down the cutter holder and can stop while moving up or down the cutter holder and maintain a height of the cutter holder, and a position detection sensor which can continuously detect the height of the cutter holder. A traverse motion actuator 34 enables traverse motion of the sand cut mechanism. It is preferable to include a buck-up unit 32 having a pressing plate 39 which prevents damage of the raised casting mold at the side of a cutter blade moving end.SELECTED DRAWING: Figure 4

Description

The present invention relates to a mobile mold cutting sand cutter that can sand cut the anti-cavity surface of a raised mold that has been raised higher than the height of the metal frame to an arbitrary height.

In order to produce casting materials without being limited by the height of the metal frame, there is a demand for equipment that can mold an upper mold higher than the height of the metal frame and place a weight on top of it. For this reason, it has become necessary to sand-cut the anti-cavity surface of the raised mold, which is higher than the height of the metal frame, to an arbitrary height.

Patent Document 1 discloses that a cutter blade mount is supported on a horizontal rotating shaft installed below a mold conveyance line, and a cylinder is used to rotate the cutter blade mount to raise the cutter blade and move the conveyance line. A stationary sand cutter is described for cutting excess sand from a moving mold. However, in this structure, the rotating shaft of the cutter blade mount is fixed, so it was not possible to sand-cut the surface opposite to the cavity of the raised mold at an arbitrary height.

Patent Document 2 describes a movable sand cutter that cuts excess sand by reciprocating a blade in a direction perpendicular to the mold conveyance line below the mold conveyance line. However, since the reciprocating path is fixed and the height of the sand-cut surface cannot be changed, it has not been possible to sand-cut the anti-cavity surface of the raised mold at an arbitrary height.

In addition, when sand-cutting the anti-cavity surface of a raised mold that has been raised higher than the height of the metal frame using the fixed sand cutter of Patent Document 1, the raised mold on the cutting edge side of the cutter blade is affected by the reaction force at the time of sand cutting. In some cases, the mold was damaged due to the height of the mold, which resulted in the loss of the advantage of making the mold higher than the height of the metal frame.

Japanese Patent Application Publication No. 2005-199305 JP2014-057988A

Accordingly, a first object of the present invention is to provide a sand cutter for mold cutting that can sand cut the anti-cavity surface of a raised mold that is higher than the height of the metal frame to an arbitrary height. A second object of the present invention is to provide a sand cutter for mold cutting that can prevent damage to the mold on the leading end side of the cutter blade due to reaction force during sand cutting.

The invention according to claim 1, which has been made to solve the above-mentioned first object, includes a tool rest to which a cutter blade is attached, a mechanism for raising and lowering the tool rest, stopping the tool rest midway up and down, and adjusting the height of the tool rest. The sand cutting mechanism is equipped with a turret lifting actuator that can hold the turret, and a position detection sensor that can detect the height of the turret, and the sand cutting mechanism can be traversed by a traversing actuator.

Further, the invention of claim 2, which has been made to solve the above-mentioned second object, is that in the invention of claim 1, the cutter blade can be pressed against the heaping mold on the end side, and the cutter blade can be stopped in the middle of movement. , a presser plate that can be held at a stop position, a lifting actuator that can raise and lower the presser plate, stop it midway up and down, and hold it at the stop position, and a second position detection sensor that can detect the height of the presser plate. It is equipped with a backup unit with The pressing plate of the backup unit can be pressed against the heaping mold on the cutter blade end side in order to prevent damage to the heaping mold.

The sand cutter for cutting molds according to claim 1 is characterized in that the height of the tool post is adjusted to a height at which the sand cutting amount is set in advance using the position detection sensor, based on mold height information after molding. can be controlled. Alternatively, the height of the tool post is controlled using the position detection sensor to match the height of the mold that has been input in advance to the molding conditions required when molding the mold set for each model. It can be done. Furthermore, there is a presser plate that can be pressed against the heaping mold on the end side toward the cutter blade, and that can be stopped in the middle of movement and held at the stop position; The backup unit includes a lifting actuator that can be held at a stopped position and a second position detection sensor that can detect the height of the holding plate, and the unit is configured to move to the second position in conjunction with the controlled height of the tool post. The height of the presser plate of the backup unit can be controlled using a detection sensor.

According to the mold cutting sand cutter of the present invention, the anti-cavity surface of the raised mold, which is higher than the height of the metal frame, can be sand cut to an arbitrary height. Further, according to the sand cutter of the present invention equipped with a backup unit, it is possible to prevent damage to the mold on the leading end side of the cutter blade due to reaction force during sand cutting.

It is a front view showing a mold with a frame in which a weight is placed on an upper mold whose anti-cavity surface is sand-cut at the end level of the upper frame. FIG. 3 is a front view showing a mold with a frame in which a weight is placed on an upper mold whose anti-cavity surface is sand-cut at a position higher than the end level of the upper frame. It is a front view showing the whole mold making line. It is a front view showing the sand cutter of an embodiment, and shows the original position when sand cutting the anti-cavity surface of the raised mold at a position higher than the edge of the metal frame. It is a top view of a sand cutter. (A-A arrow view in Figure 4) It is a side view of a sand cutter. (B-B arrow view in Figure 4) FIG. 3 is a side view of the backup unit. (C-C arrow view in Figure 4) FIG. 7 is a front view showing the original position when the anti-cavity surface of the lower mold is sand cut at the end level of the metal frame. It is a partial side view of a sand cutter. (D-D arrow view in Figure 8) It is a top view of a position detection sensor. It is a front view which shows the state before sand-cutting a raised mold at the highest position than the edge of the metal frame on the side opposite to the cavity. (Backup unit holding plate advances) FIG. 3 is a front view showing the state before the raised mold is sand-cut at a position slightly higher than the end of the metal frame on the side opposite to the cavity. (Backup unit holding plate advances) FIG. 3 is a front view showing a state in which the raised mold is sand-cut at a position higher than the end of the metal frame on the side opposite to the cavity. FIG. 7 is a front view showing a state in which the holding plate of the backup unit is cleaned after the heaping mold is sand-cut at a position higher than the end of the metal frame on the side opposite to the cavity. FIG. 3 is a front view showing a state in which the lower mold is sand-cut at the end level of the metal frame on the side opposite to the cavity. (Backup unit is not activated)

Embodiments of the present invention will be described below.
FIG. 1 is a front view showing a framed mold in which a lower mold 2a and an upper mold 2b are mounted on a surface plate cart 4. As shown in FIG. The upper mold 2b has its anti-cavity surface 5 sand-cut at the level of the end of the upper frame 3b, and the weight 1 is placed on it. FIG. 2 is a front view showing a framed mold in which a lower mold 2a and a raised mold 2c are placed on a surface plate cart 4. The anti-cavity surface 5 of the raised mold 2c is sand-cut at a position higher than the end level of the upper frame 3b, and the weight 1 is placed on it. In order to place the lower mold 2a, the upper mold 2b or the heaping mold 2c, and the weight 1 on the surface plate cart 4 in this way, the anti-cavity surface 5 of the lower mold 2a that is in contact with the surface plate cart 4 and the upper mold that is in contact with the weight 1 are placed on the surface plate cart 4. It is necessary to sand-cut the anti-cavity surface 5 of the mold 2b or the raised mold 2c into a flat surface. Note that 3a is the lower frame.

(overall structure)
FIG. 3 is a front view showing the entire mold making line 6. As shown in FIG. A frame feed pusher 7 is arranged on the entry side of the mold making line 6, and a cushion device 8 is arranged on the exit side. The upper mold 2b or the heaping mold 2c and the lower mold 2a are conveyed one frame at a time in the direction of the arrow on the roller conveyor 9 of the mold making line 6 while being sandwiched between the frame feed pusher 7 and the cushion device 8. Note that the upper molds 2b, 2c and the lower mold 2a are alternately conveyed on the roller conveyor 9.

The mold making line 6 has, from the input side to the output side, an empty frame carrying traverser 10, an empty frame separation device 11, a molding machine 12, an upper and lower frame reversing machine 13, a sand cutter 31 of the present invention, and a surface plate setting device 15. , an upper frame reversing machine 16, a frame aligning device 17, a aligning frame unloading traverser 18, and the like are arranged. Note that the sprue digging device, gas drilling device, core setting device, etc. that are not related to the transportation of the upper and lower molds are omitted from this figure.

The upper frame 3b and the lower frame 3a carried into the mold making line 6 by the empty frame carry-in traverser 10 are separated by the empty frame separating device 11, and sent to the molding machine 12 alternately with the upper frame 3b leading. In the molding machine 12, an upper mold 2b or a raised mold 2c is molded inside the upper frame 3b, and a lower mold 2a is molded inside the lower frame 3a. The molding machine 12 has a function of detecting the height of the mold after molding. The formed upper mold 2b, heaping mold 2c, and lower mold 2a are turned upside down by the upper and lower frame reversing machine 13, and placed on the roller conveyor 9 with the anti-cavity surface 5 facing downward.

Next, the lower mold 2a is placed at a position where the anti-cavity surface 5 is aligned with the edge level of the lower frame 3a, and the upper mold 2b or the raised mold 2c is placed at a position where the anti-cavity surface 5 is aligned with the set height. It is sand cut by the sand cutter 31 of the invention. The structure and operation of the sand cutter 31 of the present invention will be described later.

The surface plate cart 4 is transported to the surface plate setting device 15 by another route (not shown). The surface plate cart 4 is set on the lower mold 2a in the surface plate setting device 15, and only the upper mold 2b or the raised mold 2c is turned over again by the upper frame reversing machine 16, so that the anti-cavity surface 5 is on the upper side. Next, the upper mold 2b or the raised mold 2c is lifted up by the frame matching device 17, and the upper mold 2b or the raised mold 2c is placed on the lower mold 2a carried under the frame matching device 17, thereby completing the frame matching. After the frames have been aligned, the upper and lower molds are carried out to a subsequent process by a matching frame carry-out traverser 18. Then, a weight 1 is placed on the upper surface of the sand-cut upper mold 2b or the raised mold 2c in a post-process (not shown), and the metal is poured.

(Sand cutter)
The structure of the sand cutter 31 will be described below with reference to FIGS. 4 to 6. The sand cutter 31 is provided below the roller conveyor 9 of the mold making line 6. As shown in FIG. 5, two guide pins 35 are arranged in a direction perpendicular to the conveying direction of the mold, and the sand cutting mechanism 14 placed on the guide pin holder 33 has a structure that can be traversed by the traverse actuator 34. It has become. Traversing here means moving in a direction perpendicular to the conveying direction of the mold.

The sand cutting mechanism 14 includes two guide pins 21 fixed vertically to its left and right frames, and the left and right guide pin holders 22 are connected by a tool rest 20, and the tool rest 20 can be raised and lowered by a tool rest raising/lowering actuator 19. It has a structure. The turret lift actuator 19 uses a hydraulic cylinder or an electric cylinder with a brake that is moved up and down by a center-closed three-position solenoid valve, and has the function of being able to stop mid-way up and down and hold it at the stop position. In this embodiment, in order to make the sand cutting mechanism 14 more compact, a hydraulic cylinder is used which is raised and lowered by a 3-position solenoid valve with a closed center.

A position detection sensor 23 that can continuously detect the height of the tool rest 20 is fixed near one side of the guide pin 21 in parallel with the guide pin 21. As shown in FIG. 6, a pointer 25 is attached to a guide pin holder 22 that moves up and down along a guide pin 21 to detect the height of the tool rest 20. Note that details of this part are shown in FIG. In this embodiment, the position detection sensor 23 is a linear encoder, but instead, a distance measurement sensor may be used to detect the height of the tool post 20.

As shown in FIGS. 4 and 5, a cutter blade 26 having a length spanning the entire length of the mold is attached to the tool rest 20. In this embodiment, the cutter blades 26 are provided in two rows, front and back, but they may be provided in one row. FIG. 4 shows how the raised mold 2c formed in the upper frame 3b is sand-cut by the cutter blade 26.

The upper mold 2b or the heaping mold 2c, and the lower mold 2a are conveyed on a roller conveyor 9 composed of rollers 36 and side rollers 37. When the sand cutting mechanism 14 is caused to traverse by the traverse actuator 34 as shown in FIG. 4 while the conveyed mold is stopped, the portion shown as S in FIG. 4 is sand cut.

In addition, FIGS. 4 to 6 are diagrams showing a state in which sand cutting is performed at a position higher than the upper frame 3b of the heaping mold 2c, and FIGS. 8 to 9 are views showing the end of the lower frame 3a of the anti-cavity surface 5 of the lower mold 2a. It is a figure which shows the state of sand-cutting with a level.

(sand cut level)
The control of the sand cut level will be explained below. Here, the sand cut amount refers to the height of the sand mold that is cut from the mold height after molding, and the sand cut level refers to the height of the sand mold required after sand cutting. . The sand cutting level is controlled by matching the height of the tool post 20 detected by the position detection sensor 23 with a level instructed by a control means (not shown). The following two types of sand cut level control can be selected. The first method is based on mold height information after molding sent from the molding machine 12. That is, the height of the tool rest 20 detected by the position detection sensor 23 is controlled based on the mold height information after molding and the amount of sand cut inputted in advance. For example, when the sand cut amount is input as 1 mm, the height of the mold after molding is controlled to be sand cut by 1 mm. By performing sand cutting based on the height of the mold after molding in this way, it is possible to reduce damage to the raised mold due to reaction force when sand cutting a mold raised to a height higher than the height of the upper frame 3b.

The second method is to control the height of the tool rest 20 to the mold height that has been input in advance to the molding conditions necessary for molding a mold set for each model. For example, if the height of the mold after sand cutting is input to the height of the upper frame 3b + 50 mm, the control is such that the sand cut is always performed to the height of the upper frame 3b + 50 mm even if the height of the mold after molding changes. By making the mold height constant after sand cutting for each model, the pouring conditions (height from the ladle to the cavity) can be made constant.

In the above-described embodiment, only the upper mold is molded to be raised to a height higher than the height of the metal frame, but the lower mold may also be molded to be raised to a height higher than the height of the metal frame and then sand-cut.

(backup unit)
Next, a description will be given of the backup unit 32 that prevents damage to the heaping mold on the cutter blade end side.
As shown in FIG. 7, two guide pins 46 are provided in the vertical direction on the fixed frame 45 on the cutter blade end side, and the lifting platform 41 connects guide pin holders 47 on both sides of the platform 41 to these guide pins 46. It is raised and lowered by the raising and lowering actuator 40. The lifting actuator 40 uses a hydraulic cylinder or an electric cylinder with a brake that lifts and lowers with a center-closed 3-position solenoid valve that can stop during lifting and hold the stopped position, and lifts and lowers in accordance with the sand cut level of the mold described above. let As will be described next, a presser plate 39 is mounted on the elevator platform 41, and the height of the presser plate 39 is continuously detected by the second position detection sensor 42. The second position detection sensor 42 is fixed parallel to the guide pin 46 and detects the height of the holding plate 39 by attaching a pointer 48 to a guide pin holder 47 that moves up and down. Although a linear encoder is used as the second position detection sensor 42 in this embodiment, a distance measurement sensor may be used instead to detect the height of the tool post 20.

As shown in FIG. 7, this lifting platform 41 is provided with two guide pins 44 horizontally. 11, it is moved by the horizontal actuator 38 toward the heaping mold 2c on the cutter blade end side. Similarly to the elevating actuator 40, the horizontal actuator 38 is preferably a hydraulic cylinder or an electric cylinder with a brake, which is moved up and down by a center-closed three-position solenoid valve that can maintain an intermediate stop position. The pressing plate 39 advances until it comes into close contact with the side surface of the heaping mold 2c, and then stops.

In order to bring the presser plate 39 into close contact with the heaping mold 2c without creating a gap, the horizontal actuator 38 must have a margin of stroke and must be such that the pressing force of the presser plate 39 does not break the heaping mold 2c. Therefore, in this embodiment, a pressure reducing valve is provided in the hydraulic circuit of the horizontal actuator 38 so that the pressing force of the holding plate 39 can be controlled. In addition, a pressure increase in the hydraulic circuit is detected by a pressure switch (not shown), and when it is detected that the presser plate 39 is in close contact with the heaping mold 2c, the center-closed 3-position solenoid valve is returned to the neutral position. The extrusion position is maintained. By holding the extrusion position of the holding plate 39 with the center-closed 3-position solenoid valve in this way, the heaping mold 2c can be moved without being defeated by the thrust of the traverse actuator 34 that causes the sand cut mechanism 14 to traverse even under reduced pressure. Can be backed up.

The sand cutting mechanism 14 controls the height of the holding plate 39 using the second position detection sensor 42 in conjunction with the sand cutting height instructed by the control means. For example, the lower surface of the presser plate 39 is controlled to be at a position 5 mm higher than the tip of the cutter blade 26. By controlling the height of the press plate 39 in conjunction with the height of the cutter blade 26 in this way, collision between the press plate 39 that backs up the heaping mold 2c at a position close to the cutter blade 26 and the cutter blade 26 can be prevented. It can be prevented.

Note that since the holding plate 39 has a thickness in the height direction, it can back up the heaping mold 2c only up to a height that does not interfere with the metal frame. If the presser plate 39 interferes with the metal frame when sand-cutting a low heaping mold 2c, the backup unit 32 is not activated and the sandcutting is performed without backing up the heaping mold 2c. let

(effect)
Next, the operation of the sand cutter for mold cutting of the present invention will be explained.
In FIG. 11, in order to sand-cut the heaping mold 2c at the highest position than the upper frame 3b on the side opposite to the cavity, the cutter blade 26 of the sand cutting mechanism 14 and the presser plate 39 of the backup unit 32 are set at the lowest position, and the presser plate 39 is placed at the lowest position. The figure shows a state in which the mold 2c is brought into close contact with the heaping mold 2c. From this state, the cutter blade 26 is moved laterally as shown in FIG. 13, and the portion shown as S in FIG. 11 is sand-cut. Since the heaping mold 2c on the cutter blade end side is supported and backed up by the holding plate 39, it will not be destroyed during sand cutting. After that, as shown in FIG. 14, it is preferable that the presser plate 39 of the backup unit 32 is moved back and then raised, and the mold presser surface of the presser plate 39 is cleaned with the fixed brush 49.

FIG. 12 is a diagram in which the cutter blade 26 of the sand cutting mechanism 14 and the holding plate 39 of the backup unit 32 are set at an intermediate height in order to sand cut the heaping mold 2c at a position slightly higher than the upper frame 3b on the side opposite to the cavity. . As shown by the imaginary line in FIG. 12, the holding plate 39 is advanced to bring it into close contact with the heaping mold 2c, and the cutter blade 26 is moved laterally to sand-cut the portion shown as S in FIG.

As mentioned above, since the holding plate 39 has a thickness in the height direction, if it is raised to a higher position than that shown in FIG. 12, it will interfere with the metal frame. cannot be backed up. Therefore, when sand-cutting the heaping mold 2c at a higher position than that shown in FIG. 12, the back-up unit 32 is not activated and the sand-cutting is performed without backing up the heaping mold 2c.

FIG. 15 shows a state in which the lower mold 2a is sand-cut at the end level of the lower frame 3a on the side opposite to the cavity. In this case, since there is no part of the lower mold 2a to which the pressing plate 39 is brought into close contact, sand cutting is performed without operating the backup unit 32. In this case, there is no fear that the lower mold 2a will be destroyed on the cutter blade end side.

(summary)
As explained above, the present invention has the following advantages.
(1) On a molding line where a weight is placed to prevent the upper frame from lifting up during pouring, castings larger than the height of the metal frame can be produced by combining it with a molding machine that can make molds higher than the height of the metal frame. It becomes possible to do so.
(2) By backing up the raised mold on the end side toward the cutter blade, it is possible to prevent damage to the raised mold due to reaction force when sand cutting a mold that has been raised to a height higher than the height of the metal frame.
(3) In combination with a molding machine equipped with a function to detect the height of the mold after molding, and by sand cutting based on the height of the mold after molding, when sand cutting a mold that has been built up to a height higher than the height of the metal frame. Damage to the heaping mold due to the reaction force can be reliably prevented.
(4) The pouring conditions (height from the ladle to the cavity) can be kept constant by performing sand cutting based on the mold height that has been input in advance to the molding conditions.
(5) By raising and lowering the presser plate in conjunction with the height of the tool post, it is possible to prevent the cutter blade from colliding with the presser plate that backs up the mold at a position close to the cutter blade.

1 Weight 2a Lower mold 2b Upper mold 3a Lower frame 3b Upper frame 4 Surface plate cart 5 Anti-cavity surface 6 Mold making line 7 Frame feed pusher 8 Cushion device 9 Roller conveyor 10 Empty frame carrying traverser 11 Empty frame separation device 12 Molding machine 13 Upper and lower frame reversing machine 14 Sand cutting mechanism 15 Surface plate setting device 16 Upper frame reversing machine 17 Frame aligning device 18 Aligning frame carry-out traverser 19 Turret lifting actuator 20 Tool rest 21 Guide pin 22 Guide pin holder 23 Position detection sensor 24 Frame 25 Pointer 26 Cutter blade 31 Sand cutter 32 Backup unit 33 Guide pin holder 34 Traverse actuator 35 Guide pin 36 Roller 37 Side roller 38 Horizontal actuator 39 Holding plate 40 Lifting actuator 41 Lifting table 42 Second position detection sensor 43 Guide pin holder 44 Guide pin 45 Fixed frame 46 Guide pin 47 Guide pin holder 48 Pointer 49 Fixed brush S Part of the mold to be sand cut

Claims (6)

A turret to which a cutter blade is attached, a turret lift actuator capable of raising and lowering the turret, stopping it midway up and down, and maintaining the height of the turret, and detecting the height of the turret. 1. A sand cutter for mold cutting, comprising a sand cutting mechanism having a position detection sensor capable of detecting the position of the sand cutting mechanism, the sand cutting mechanism being able to be traversed by a traversing actuator. A presser plate that can be pressed against the heaping mold at the end of the cutter blade, and can be stopped in the middle of movement and held at the stop position; and a presser plate that can be moved up and down, stopped on the way up and down, and held at the stop position. 2. The sand cutter for cutting molds according to claim 1, further comprising a backup unit having an elevating actuator that can be held by the holding plate, and a second position detection sensor that can detect the height of the holding plate. 3. The sand cutter for mold cutting according to claim 2, wherein the pressing plate of the backup unit can be pressed against the raised mold in order to prevent damage to the raised mold on the cutter blade facing end side. The mold according to claim 1, wherein the height of the tool post is controlled to a height at which a preset sandcut amount is achieved using the position detection sensor based on mold height information after molding. Sand cutter for cutting. Claim 1: The height of the tool post is controlled using the position detection sensor to a mold height that is input in advance to molding conditions necessary for molding a mold set for each model. Sand cutter for mold cutting described in . A presser plate that can be pressed against the heaping mold at the end of the cutter blade, and can be stopped in the middle of movement and held at the stop position; and a presser plate that can be moved up and down, stopped on the way up and down, and held at the stop position. and a backup unit having a lifting actuator that can be held by the holding plate and a second position detection sensor that can detect the height of the holding plate,
The sand cutter for mold cutting according to claim 4 or 5, wherein the height of the pressing plate of the backup unit is controlled using the second position detection sensor in conjunction with the controlled height of the tool post.

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