JP2010519040A - Method and apparatus for forming mold with cast frame - Google Patents

Abstract

There is provided a molding method and apparatus capable of molding a mold with a cast frame in as short a cycle as possible. The molding method is a method in which a casting frame is moved to a position between a pattern carrier and a sand hopper by a casting frame conveyor that moves the casting frame in a horizontal direction at a transfer level, and a casting mold with a casting frame is formed. While maintaining the transfer level, the sand hopper, squeeze means and fill frame are lowered to the casting frame, and the pattern carrier and frame-like frame are raised to the casting frame, and the sand hopper, squeeze means, filling frame, casting frame and pattern plate are raised. Forming a molding space with a frame-shaped frame; filling the molding space with foundry sand; compressing the molding sand in the molding space to form a mold with a casting frame; sand hopper, squeeze means, and And raising the filling frame and lowering the pattern carrier and the frame-like frame so that the cast-with-mold can be carried out.

[Selection] Figure 1

Description

  The present invention relates to a method and apparatus for continuously forming a mold with a cast frame, particularly a plurality of molds with a cast frame.

  As a prior art related to the method and apparatus for forming a mold with a cast frame of the present invention, there is one disclosed in International Publication No. WO0132333 of the PCT application by the applicant of the present application. The molding machine disclosed in this publication discloses a pattern plate having a pattern and placed at a predetermined position, a cast frame placed on the pattern plate and surrounding the pattern, and a mold placed on the cast frame. In order to compress the foundry sand in the molding space formed by the frame, it is fixed to the tip of the piston rods of the plurality of upwardly spaced cylinders standing upright and these upward cylinders, and can be raised and lowered A mounting frame supported on the molding space, and a plurality of spaced sand discharge nozzles which are fixed to the mounting frame and hold the foundry sand inside to supply the molding sand to the molding space. And a sand hopper that can enter the filling frame when lowered by the upward cylinder, and a position adjacent to the side of the spaced sand discharge nozzle below the sand hopper. A plurality of squeeze feet provided on the top of the filling frame together with the bottom of the sand hopper when the sand hopper is lowered by the upward cylinder and enters the top of the filling frame, A squeeze foot for compressing the foundry sand in the molding space together with the lower part of the sand hopper when the sand hopper is lowered by the upward cylinder and enters the filling frame after the sand is filled in the molding space. Prepare. The entire disclosure of WO 0132333 is hereby incorporated by reference.

In the conventional molding machine disclosed in WO 0132333, when forming a molding space (casting sand filling space), a step of placing the casting frame on the leveling frame, a placing frame on the casting frame, and There are two processes: a process of lowering the squeeze foot and entering the fill frame. Further, when the mold with a cast frame is lifted and made ready for unloading after die cutting, there are two processes: a process until the roller device comes into contact with the cast frame and a process of lifting the mold with the cast frame to the rising end after the contact. There are two processes. For this reason, the problem that molding cycle time becomes long has arisen. For this reason, there has been a demand from this type of industry for a molding method and apparatus that can shorten the mold molding cycle time as much as possible.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a molding method and apparatus capable of molding a mold with a cast frame in as short a cycle as possible.

  In order to achieve the above object, the casting mold with a casting frame according to the present invention is a method in which a casting frame is moved to a position between a pattern carrier and a sand hopper by a casting frame conveyor that moves the casting frame in a horizontal direction at a transfer level. In this method, the sand hopper, the squeeze means and the filling frame are lowered to the casting frame and the pattern carrier and the frame-like frame are raised to the casting frame while maintaining the casting frame at the transfer level. And forming a molding space with a sand hopper, squeeze means, filling frame, casting frame, pattern plate and frame-like frame; filling the molding space with molding sand; and compressing the molding sand in the molding space And making the mold with a cast frame; and raising the sand hopper, squeeze means and filling frame, and lowering the pattern carrier and the frame frame, so that the mold with the cast frame can be carried out. A method having; a step to.

Further, in order to achieve the above object, a casting frame mold making apparatus according to the present invention carries an elevating support frame installed between upper ends of upward cylinders erected on both the left and right sides of a base; and a pattern plate A pattern carrier; a frame-like frame that surrounds the outer periphery of the pattern carrier and is configured to be movable up and down; and is rotatably supported by one of the upward cylinders, and a plurality of pattern carriers are set A pattern changer capable of alternately loading and unloading the pattern carrier above the center of the base; and a two-stage type which is disposed below the pattern carrier located above the center of the base and raises and lowers the pattern carrier and the frame-like frame Elevating means; suspended and supported by an elevating support frame, and aerating for floating and fluidizing foundry sand by injecting air into the interior. A sand hopper provided with an ejection chamber; squeeze means disposed at the lower end of the sand hopper; a sand filling nozzle disposed around the squeeze means; a group of squeeze means and sand filling nozzles A filling frame which surrounds the outer periphery so as to be movable up and down; a casting frame conveyor which is provided between the pattern carrier located above the center of the base and the sand hopper and carries the casting frame in and out in the horizontal direction at the transfer level; Is a mold making apparatus for a mold with a cast frame.

As apparent from the above configuration, according to the present invention, when forming the molding space, the sand hopper, the squeeze means and the filling frame are lowered to the casting frame and the pattern carrier and the frame-like frame are raised to the casting frame, Since the molding space is formed substantially by one process, the molding cycle time can be shortened as compared with the conventional process of forming the molding space by two processes. In addition, after the mold is released, the sand hopper, the squeeze means and the filling frame are raised and the pattern carrier and the frame-like frame are lowered, so that the mold with the cast frame can be carried out substantially in one step. The molding cycle time can be shortened here as compared with the conventional case where the mold with a cast frame is made unloadable in two steps.
Other aspects of the invention and its advantages will become apparent by reference to the following embodiments described below with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing a state of operation start of the molding apparatus according to the embodiment of the present invention. FIG. 2 is an AA arrow view in FIG. FIG. 3 is a longitudinal sectional view showing a state where a molding space is formed in the apparatus of FIG. FIG. 4 is a longitudinal sectional view showing an aeration filling state of the foundry sand in the apparatus of FIG. FIG. 5 is a longitudinal sectional view showing a primary squeeze state of foundry sand in the apparatus of FIG. 6 is a longitudinal sectional view showing a secondary squeeze state of foundry sand in the apparatus of FIG. FIG. 7 is a vertical cross-sectional view showing a state in which the molding mold is removed in the apparatus of FIG. FIG. 8 is a longitudinal sectional view showing a state in which the mold with a cast frame of the apparatus of FIG. 1 can be carried out.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, upward cylinders 2 and 2 are erected on both the left and right sides of the base 1, and an elevating support frame 3 is installed between the upper ends of the piston rods 2a and 2a of the upward cylinders 2 and 2. . Further, at the lower part of one of the upward cylinders 2 and 2 (on the left side in FIG. 1), the central portion of the rotary type pattern changer 4 is supported so as to be rotatable in a horizontal plane. Pattern carriers 6 and 6A carrying pattern plates 5 and 5A (each carrying the same pattern or different patterns, for example, upper and lower patterns) are set at both ends, and the pattern carriers 6 and 6A are set on the substrate 1 It is made to carry in / out alternately at the center upper part.

  A plurality of guide rods 7 and 7 are connected to the bottom of the four corners of the planes of the pattern carriers 6 and 6A. The guide rods 7 and 7 surround the outer periphery of the pattern carriers 6 and 6A and can move up and down. The frame-like frames 8 and 8A configured as described above are inserted into holder portions 8a and 8a so as to be vertically slidable. A plurality of positioning members 4b and 4b (see FIG. 2) are fixed on the frame portions 4a and 4a in the pattern exchange device 4. The frame-shaped frames 8 and 8A are positioned on the pattern exchange device 4 by the concave portions formed thereon being placed and engaged with the positioning members 4b and 4b. In this way, the pattern carriers 6 and 6A are set in the pattern exchange device 4 via the frame-shaped frames 8 and 8A. With this configuration, the rod-shaped frames 8 and 8A are movable upward with respect to the frame portions 4a and 4a.

  Also, below the pattern carrier 6 located above the center of the base 1, a two-stage lifting means 9 for lifting the pattern carrier 6 and the frame-like frame 8 is disposed. Here, the configuration of the two-stage lifting / lowering means 9 (telescopic cylinder) will be described in detail. A first elevating member 9c having a peripheral edge protruding upward is connected to the tip of the first elevating rod 9b of the first cylinder 9a of the two-stage elevating means 9, and the first elevating member 9c A through hole 9d is formed in the center. The first elevating rod 9b of the first cylinder 9a is configured to accommodate the second elevating rod 9f of the second cylinder 9e. That is, the second cylinder 9e also serves as the first lifting rod 9b of the first cylinder 9a. The second lifting rod 9f passes through the through hole 9d. A second lifting / lowering member 9g is connected to the tip of the second lifting / lowering head 9f, and pattern carrier holding means 9h and 9h (see FIG. 2) are attached to the second lifting / lowering member 9g. In this embodiment, the pattern carrier holding means 9h, 9h is one that holds a pattern carrier by an electromagnet, but is not limited to this, and for example, it is held by suction or mechanically. Also good.

  A sand hopper 14 is suspended and supported on the lifting support frame 3. The sand hopper 14 has a sand inlet 11 that is opened and closed by a slide gate 10 at an upper end, and an air supply pipe 12 at an upper part. Low pressure air (for example, 0.05-0, 18 MPa) can be introduced into the sand hopper 14 through the air supply pipe 12 by opening a switching valve (not shown) of the air supply pipe 12. The sand hopper 14 is also provided with a number of air ejection chambers 13, 13 in the lower interior. These chambers communicate with a compressed air source (not shown) through one switching valve (not shown). In addition, low-pressure air (for example, 0.05 to 0, 18 MPa) is ejected from the large number of air ejection chambers 13 and 13 into the sand hopper 14 to form aeration for floating and fluidizing the foundry sand S. . Further, at the lower end of the sand hopper 14, a plurality of squeeze feet 15 and 15 that can be controlled to be lifted and stopped as squeeze means, and sand filling nozzles 16 and 16 are disposed around the squeeze feet 15 and 15. .

  In addition, a filling frame 17 that surrounds the outer periphery of the group of the squeeze feet 15 and 15 and the sand filling nozzles 16 and 16 so as to be movable up and down is provided on the outer side of the sand hopper 14 so as to face downward. , 18 are connected to each other. A vent hole (not shown) is drilled in the upper part of the fill frame 17. Further, between the pattern carrier 6 located above the center of the base 1 and the sand hopper 14, a roller competitor 20 is disposed as a cast frame competitor for carrying in and out the cast frame 19 in the horizontal direction. The roller competitor 20 is fixed to a frame (not shown), and the cast frame 19 is maintained at the transfer level of the roller competitor 20.

  Next, the operation of the thus configured will be described in detail. In the state of FIG. 1, the pattern carrier 6 on which the pattern plate 5 is placed is carried into the upper center of the substrate 1, and an empty casting frame 19 is carried into a position between the pattern carrier 6 and the sand hopper 14 by the roller competitor 20. It is in the state. Further, the sand hopper 14 is filled with foundry sand S, and the plurality of squeeze feet 15 and 15 as a whole are in a state of forming irregularities relative to the irregularities of the lower pattern plate 5 (that is, different levels). Located). Further, the frame-shaped frame 8 is slightly protruded upward (30 mm in this embodiment) from the parting surface of the pattern plate 5.

  After operating the slide gate 10 in this state and closing the sand inlet 11, the upward cylinders 2 and 2 are contracted and the filling cylinders 18 and 18 are extended to operate the sand hopper 14, squeeze foot 15, 15 and the frame 17 are lowered to the casting frame 19 and the first lifting rod 9b is extended from the first cylinder 9a to raise the pattern carrier 6 and the frame-shaped frame 8 to the casting frame 19, and the sand hopper 14, A molding space is formed by the squeeze feet 15 and 15, the filling frame 17, the casting frame 19, the pattern plate 5, and the frame-shaped frame 8, and the state shown in FIG. 3 is obtained. At this time, the molding space is in a state in which the squeeze feet 15 and 15 are formed in an uneven shape opposite to the unevenness of the pattern plate 5. The pattern carrier 6 is held by the second elevating member 9g by the operation of the pattern carrier holding means 9h, 9h when the extension operation of the first elevating rod 9b starts.

  Next, aeration valves (not shown) are connected to the air supply pipe 12 while performing aeration to eject low-pressure air from the multiple air ejection chambers 13 and 13 into the sand hopper 14 to float and fluidize the foundry sand S inside the sand hopper 14. Open and supply low-pressure air from the supply pipe 12 to the foundry sand in the sand hopper 14 from above, and as shown in FIG. 4, the foundry sand S is blown and filled into the molding space from the sand filling nozzles 16 and 16 with low-pressure air. To do. At this time, the low pressure air at the time of blowing and filling is exhausted from the vent hole (not shown) or the vent hole (not shown) of the pattern plate 5 drilled in the filling frame 17.

  Next, the upward cylinders 2 and 2 are further contracted and the elevating support frame 3 and the members supported thereby are lowered while contracting the filling cylinders 18 and 18, and a plurality of squeeze feet 15 and 15 The squeeze sand S is primarily squeezed until all the bottom surfaces of the sand are at the same level (the squeeze foot is allowed to discharge the working fluid freely), and the slide gate 10 is reversely operated to open the sand inlet 11. It is made to the state of 5.

  Next, by extending the second elevating rod 9f of the second cylinder 9e, the pattern carrier 6 is slid up through the second elevating member 9g and with the help of the guide rods 7 and 7. Then, the pattern plate 5 is raised to secondarily squeeze the foundry sand S. As a result, the parting surface of the pattern plate 5 is set to substantially the same level as the abutting surfaces of the lower surface of the casting frame 19 and the upper surface of the frame-shaped frame 8, and the state shown in FIG. 6 is obtained.

  Next, by retracting the second lifting rod 9f of the second cylinder 9e, the pattern plate 5 is lowered and removed through the second lifting member 9g, the pattern carrier holding means 9h, 9h and the pattern carrier 6, The state shown in FIG. 7 is obtained. At this time, the punching is performed in a state where the casting frame 19 is sandwiched between the filling frame 17 and the frame-shaped frame 8.

  Next, the sand hopper 14, the squeeze feet 15, 15 and the filling frame 17 are lifted by extending the upward cylinders 2 and 2, and the pattern carrier 6 and the frame-shaped frame 8 are moved by contracting the first cylinder 9a. Is lowered so that the casting mold M can be carried out, and the state shown in FIG. 8 is obtained. At this time, the foundry sand S is supplied into the sand hopper 14. When the contraction operation of the first cylinder 9a is finished, the operation of the pattern carrier holding means 9h, 9h is released, and the pattern carrier 6 is held by the second lifting member 9g via the pattern carrier holding means 9h, 9h. Is released.

  Next, the mold M with the cast frame is unloaded through the roller conveyor 20, the empty cast frame 19 is loaded, and the pattern changer 4 is rotated 180 degrees to replace the pattern plate 5 and the pattern plate 5A, and a plurality of The squeeze feet 15 and 15 are actuated to form a concavo-convex shape corresponding to the concavo-convex shape of the pattern plate 5A, and the above operation is repeated.

  In the present invention, the sand hopper 14, the squeeze means 15 and 15 and the filling frame 17 are lowered to the casting frame 19 and the pattern carrier 6 and the frame-like frame 8 are raised to the casting frame. The steps 15 and 15, the fill frame 17, the casting frame 19, the pattern plate 5, and the frame-shaped frame 8 form a molding space. Thus, conventionally, when forming a molding space (casting sand filling space), the step of placing the casting frame on the leveling frame, the placing frame on the casting frame, and lowering the squeeze foot, While the two steps, the step of entering into the frame, are necessary, the molding space can be formed in substantially one step, so that the molding cycle time can be shortened. The timing of the lowering of the sand hopper 14, the squeeze means 15, 15 and the filling frame 17 and the raising operation of the pattern carrier 6 and the frame-like frame 8 may be slightly different, but the lower surface of the filling frame 17 is cast. It is preferable that the upper surface of the frame-shaped frame 8 is in contact with the lower surface of the casting frame 19 almost simultaneously with the contact with the upper surface of the frame 19.

  Further, in the present invention, the sand hopper 14, the squeeze means 15, 15 and the filling frame 17 are raised and the pattern carrier 6 and the frame-like frame 8 are lowered so that the casting mold M can be carried out. Thus, conventionally, when the mold with a cast frame is lifted and made in a state where it can be carried out after die cutting, the process until the roller device comes into contact with the cast frame, and the process of lifting the mold with the cast frame to the rising end after the contact However, the molding cycle time can also be shortened here because the casting mold with the cast frame can be substantially carried out in one step. There may be a slight time difference between the operation timing of the sand hopper 14, the squeeze nest steps 15, 15 and the filling frame 17 and the movement of the pattern carrier 6 and the frame-like frame 8 is lowered. It is preferable that the upper surface of the frame-shaped frame 8 is separated from the lower surface of the casting frame 19 at almost the same time as the separation from the upper surface of the casting frame 19.

  Furthermore, in the present invention, since the two-stage lifting means 9 for lifting the pattern carrier 6 and the frame-shaped frame 8 is disposed below the pattern carrier 6 located above the center of the base 1, the casting frame 19 is arranged in the vertical direction. Even with the configuration of the present invention that does not move to the above, the above-described secondary squeeze can be easily performed. Further, the two-stage lifting means 9 includes a first cylinder 9a having a first lifting member 9c connected to the tip of the lifting rod 9b, and a second lifting member 9g being connected to the tip of the lifting rod 9f. The second cylinder 9e is configured to be accommodated in the lifting rod 9b of the first cylinder 9a, so that the device (lifting means) has a simple and compact structure. Can do.

  In the embodiment of the present invention, when forming the molding space, the casting frame 19 is held between the filling frame 17 and the frame-shaped frame 8 in a state where the casting frame 19 is in contact with the rollers 20a, 20a of the roller competitor 20 (see FIG. 3). However, the present invention is not limited to this. For example, a roller leveler 20 is provided with a cast frame leveling mechanism (not shown), and the cast frame leveling mechanism lifts the cast frame 19 slightly above the rollers 20a and 20a (for example, 5 mm). In this state, the casting frame 19 may be held between the filling frame 17 and the frame-shaped frame 8.

Claims (4)

A method of casting a casting frame into a position between a pattern carrier and a sand hopper by a casting frame conveyor that moves the casting frame in a horizontal direction at a transfer level to form a casting mold with a casting frame:
The sand hopper, the squeeze means and the fill frame are lowered to the cast frame while the cast frame is substantially maintained at the transfer level, and the pattern carrier and the frame-shaped frame are raised to the cast frame, and the sand Forming a molding space by a hopper, the squeeze means, the filling frame, the casting frame, the pattern plate, and the frame-shaped frame;
Filling the molding space with foundry sand;
Compressing the foundry sand of the molding space to produce a mold with a cast frame;
Raising the sand hopper, squeeze means and filling frame and lowering the pattern carrier and frame-like frame to bring the mold with cast frame into a state where it can be carried out;
A method for forming a mold with a casting frame having Carrying the pattern carrier carrying the pattern plate above the center of the base of the molding machine and carrying the casting frame between the pattern carrier and the sand hopper;
The sand hopper, the squeeze means, the filling frame are lowered to the casting frame, and the pattern carrier and the frame-like frame are raised to the casting frame. The sand hopper, the squeezing means, the filling frame, the casting frame, the pattern Forming a molding space with a plate and the frame-shaped frame;
Filling the molding space with a sand filling nozzle through a sand filling nozzle while performing aeration of jetting air into the sand hopper charged with the casting sand to float and fluidize the foundry sand;
First squeezing the foundry sand by the squeeze means;
Raising the pattern plate to secondary squeeze the foundry sand;
Lowering the pattern plate and removing the mold;
Raising the sand hopper, the squeeze means, and the filling frame, and lowering the pattern carrier and the frame-like frame to bring the cast-in-frame mold into a state that can be carried out;
A method for forming a mold with a cast frame, comprising: An elevating support frame erected between upper ends of upward cylinders erected on both the left and right sides on the base; a pattern carrier carrying a pattern plate; a frame configured to surround the outer periphery of the pattern carrier and move up and down A pattern exchange device that is rotatably supported by one of the upward cylinders, and in which a plurality of the pattern carriers are set, and the pattern carriers can be alternately carried into and out of the center of the base. ;
A two-stage lifting means disposed below the pattern carrier located above the center of the base and lifting the pattern carrier and the frame-shaped frame;
A sand hopper provided with an air ejection chamber that is suspended and supported by the elevating support frame and forms aeration that causes air to be ejected into the casting sand to float and fluidize;
Squeeze means disposed at the lower end of the sand hopper;
Sand filling nozzles disposed around the squeeze means;
An embedding frame that surrounds the squeeze means and the sand filling nozzle group (s) in a vertically movable manner;
A cast-in-frame conveyor installed between the pattern carrier located above the center of the base and the sand hopper to carry in and out the casting frame in the horizontal direction at the transfer level;
A mold making apparatus for a mold with a casting frame.   The two-stage lifting means includes a first cylinder in which a first lifting member is connected to a tip of a first lifting rod, a second lifting member is connected to a tip of a second lifting rod, and the second lifting rod is 4. The mold making apparatus for a mold with a cast frame according to claim 3, further comprising: a second cylinder configured to be accommodated in the first lifting rod of the first cylinder.

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