JP4078640B2 - Method of pouring mold with cast frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to Chuyukata method flask mold for sand casting.
[0002]
[Prior art]
Conventionally, in order to reduce the molding sand used for the sand mold, it has been proposed to eliminate sand spills in the molding process and the sand cutting process (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-6-3357748
This document describes that the back of the mold after mold making coincides with the opening level of the casting frame to eliminate sand cut in the molding process.
[0005]
[Problems to be solved by the invention]
However, using the same cast frame with the same molding line, shape, there is a demand for molding a very different cast.
[0006]
The present invention has been made in view of the above problems. An object of the present invention is also to mold a mold having a very different shape even with the same casting frame with a minimum of foundry sand.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a casting method for a mold with a casting frame according to the present invention is a molding method comprising a pattern plate for a lower mold, a leveling frame, a lower casting frame, a bottom surface of a sand hopper, and a squeeze foot taken in and out in accordance with the pattern shape. In the lower casting frame, the casting sand is filled with air from the sand blowing nozzle into the space, and the molding sand is compressed and the squeeze foot is simultaneously reduced by contracting the frame setting cylinder and lowering the leveling frame. A step of entering a sand hopper, and a step of molding a lower mold with a cast frame in which the mold back surface is planar and the vertical position of the mold back surface is on the inner side of the opening peripheral end surface of the lower cast frame; ,
A step of filling the molding space consisting of an upper mold pattern plate, a leveling frame, an upper casting frame, a sand hopper bottom surface and a squeeze foot in accordance with the pattern shape with air blowing from a sand blowing nozzle, and a frame; The molding hopper is compressed by the set cylinder contraction and the leveling frame is lowered, and at the same time the squeeze foot is contracted so that the sand hopper enters the upper casting frame. A step of forming an upper mold with a casting frame in which the vertical position of the back surface is inside the opening peripheral end surface of the upper casting frame;
After reversing the lower mold with the casting frame, a part of the vertical position of the mold rear surface of the lower casting mold with the casting frame is set to be inside the opening peripheral end surface of the lower casting frame, and a part thereof is made higher than the depth of the space. A process of placing on a configured pouring platen;
A process of superimposing the upper mold with a casting frame on the lower mold with a casting frame such that the parting surface of the lower mold with the casting frame and the parting surface of the upper mold with the casting frame are brought into contact with each other so that the die-matching surface is flat. When,
Supporting the upper and lower casting molds with the cast frames supported by the pouring platen and moving them to a pouring position;
A process of pouring the upper and lower molds with the cast frame
It is characterized by including .
[0008]
According to the present invention, the position of the casting mold back of the upper and lower molds, inner flasks than the flask opening peripheral edge surface, i.e. from closer to the center position, reducing the foundry sand used in sand mold remarkably Can do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, it is inside the molding flask open peripheral end face of the mold back as described above (hereinafter also referred to as "driving" or "implantation template") is Ru vertical mold der. Flask mold as a reference example of the present invention, only the vertical position of the mold back underneath the mold, you inside the drag flask open peripheral edge surface (Figure 1).
Another flask mold as a reference example of the present invention, only the vertical position of the mold back of the upper mold, you inward than the cope flask open peripheral edge surface (Figure 2).
The mold with a cast frame according to the present invention is such that the vertical position of the lower mold back of the lower mold is inside the lower peripheral edge of the lower mold opening, and the vertical position of the upper mold back of the upper mold is the upper mold opening peripheral. you inside the end face (FIG. 3).
Then, the mold that is not implanted as further reference example, outside the molding flask open peripheral end face vertical position of the mold back of the upper and lower molds (Fig. 4). As shown in FIG. 3, the cast-framed mold according to the present invention is the most effective in reducing sand by making the upper and lower casting molds. Moreover, it is advantageous when molding a casting smaller than the casting frame.
[0010]
In addition, the molding process of the casting mold with the casting mold in the casting method of the casting mold with the casting frame of the present invention is performed from the lower mold pattern plate, the leveling frame, the lower casting frame, the bottom surface of the sand hopper, and the squeeze foot put in and out according to the pattern shape become molding space, from the sand blowing nozzle casting sand Eare - a step of filling at Deployment, cast down by Chijimi引simultaneously squeezing feet compressing molding sand by lowering the Chijimi引and leveling frame of the frame set cylinder By the step of the sand hopper entering into the frame, a lower mold with a casting frame is formed in which the mold rear surface is planar and the vertical position of the mold rear surface is inside the opening peripheral end surface of the lower casting frame. Process, squeeze foot that is put in and out according to the pattern plate for the upper mold, leveling frame, upper casting frame, sand hopper bottom surface and pattern shape The molding space is filled with casting sand from the sand blowing nozzle by air tension, and the molding sand is compressed and the squeeze foot is contracted at the same time by lowering the frame setting cylinder and lowering the leveling frame. Forming an upper mold with a casting frame in which a sand hopper enters the casting frame, and the mold rear surface is planar and the vertical position of the mold rear surface is inside the opening peripheral end surface of the upper casting frame ing from the process of. According to this molding step, there no sand spilled at the time of turn-on of the flasks of the molding sand, of course, the mold back is superior in that it becomes flat. In addition, the mold height can be freely adjusted in consideration of the weight of the foundry sand and the compactness.
[0011]
[0012]
Further , according to the present invention, following the molding method, after reversing the lower mold with the cast frame, the vertical position of the mold back surface of the lower mold with the cast frame is set inside the opening peripheral end surface of the lower cast frame. The step of placing on a pouring platen that is configured to be partly higher than the depth of the space created by making the contact with the parting surface of the lower mold with the casting frame and the parting surface of the upper mold with the casting frame Then, a step of superimposing the upper mold with a casting frame on the lower mold with a casting frame is performed so that the die-matching surface becomes planar.
Next, the present invention performs a process of supporting the upper and lower casting molds with cast frames supported by the pouring surface plate and moving them to a pouring position, and a process of pouring the upper and lower casting molds with casting frames.
This prevents the lower mold from collapsing or cracking. Further, in the pouring method of the present invention, a configuration in which a part of the pouring platen is raised may be integrally manufactured at a predetermined height. Furthermore, a configuration in which a part of the pouring platen is raised may be configured such that the height can be adjusted. More specifically, an elastic body such as a spring or an intermediate material can be used. By using the intermediate material, it is possible to support the mold even if the back surface of the mold is not necessarily a clean plane.
[0013]
In further noted, foundry sand for use in the present invention are best green sand. When the mold is lower than the casting frame and driven, the disadvantage that the mold of fresh sand is more likely to break or break than the self-hardening sand can be solved by the pouring method of the present invention.
[0014]
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. FIG. 3 is a schematic view showing an example of a conveyance state of the mold with a cast frame of the present invention. In FIG. 1, a lower mold 3 with a casting frame 2 and an upper mold 5 with a casting frame 4 are placed on a pouring platen 1.
[0015]
Here, the pouring surface plate 1 is formed in the space 3R generated by setting the vertical position of the mold back surface 3a of the lower mold 3 to the inside of the lower casting frame opening peripheral end surface 2a. A part is made high (1H) to support the lower mold 3. And the structure which raises a part of this surface plate 1 for pouring is integrally manufactured by the predetermined height. More specifically, it can be manufactured by canning or machining. The recesses 1A and 1A visible on the pouring surface plate 1 are degassing grooves.
[0016]
In addition, although not shown in figure, the width | variety of the casting frame 2 is wide toward the vertical or parting surface. For this reason, the opening peripheral end surface 2 a of the lower casting frame 2 has a larger area than the high portion of the pouring surface plate 1.
[0017]
Further, the upper mold 5 with the cast frame 4 has a vertical position of the mold back surface 5a of the upper mold 5 outside the peripheral edge surface 4a of the upper cast frame opening.
[0018]
The mold M with a cast frame configured as described above is poured by a pouring machine or manually. At this time, a part of the pouring surface plate 1 is configured to be high in the space 3R generated by setting the vertical position of the mold back surface 3a of the lower mold 3 to the inside of the lower casting frame opening peripheral end surface 2a. Therefore, the lower mold 3 is supported. The lower mold 3 further contacts the parting surface 5b of the upper mold 5 via the parting surface 3b, and further supports the upper mold 5. Thereby, there is no deformation | transformation and collapse of the casting_mold | template M during conveyance and pouring.
[0019]
Hereinafter, an example of a molding apparatus and a molding method for a mold with a casting frame according to the present invention will be described. FIG. 5 shows a schematic view of a molding apparatus used in the molding method according to the present invention. Frame set cylinders 102, 102 are erected on both the left and right sides of the molding base 101, and an elevating support frame 103 is installed between the piston rods 102A, 102A of the frame set cylinders 102, 102. ing.
[0020]
A central portion of the pattern changer 104 is rotatably supported in a horizontal plane below one of the frame setting cylinders 102 (left side in FIG. 5). Pattern carriers 106 and 106A on which pattern plates 105 and 105A (upper and lower pattern plates) are placed are set at both ends of the plate in a state where the pattern plates 105 and 105A are lifted by about 5 mm by a spring (not shown). It is made to carry in / out alternately by the center upper part of the molding base 101. FIG.
[0021]
Extraction cylinders 107 and 107A are embedded in the pattern carrier 106 and 106A at the four corner outer positions of the pattern plates 105 and 105A, and the tip of the pattern carriers 105 and 105A surrounds the outer periphery of the pattern plate 105 and 105A. Thus, frame-shaped die-cut frames 108 and 108A that slide up and down are connected and supported.
The punching frames 108 and 108A protrude slightly upward from the parting surfaces of the pattern plates 105 and 105A at the extended ends of the pulling cylinders 107 and 107A (see FIG. 9), and the pattern plates 105 and 105A at the contraction ends. It is designed to be almost flush with the parting surface.
[0022]
A sand hopper 109 is suspended from the elevating support frame 103. The sand hopper 109 has an upper portion in the sand storage chamber 110 and a plurality of perforated plates (not shown) from the middle to the bottom. The lower fork-shaped hollow chamber 113 is provided with nozzles 114, 114 connected to the lower end of the lower-thinned hollow chamber 113. The sand storage chamber 110 is provided with a sand inlet 116 that is opened and closed by a slide gate 115 at the upper end, and a pressurizing air via a switching valve communicated with a compression air source (not shown) on the upper side. -An air supply pipe for introducing (for example, 0.05 to 0.18 MPa) is communicated (not shown).
[0023]
The sand hopper 109 is attached to a plurality of perforated plates (not shown), and is compressed into a low pressure (for example, 0.05 to 0.18 MPa) compression air into the forked hollow chamber 113. A compression air jetting means (not shown) for jetting-is provided. Further, a plurality of squeeze feet 123 that can be raised and lowered are mounted on the lower portion of the sand hopper 109.
[0024]
Further, a filling frame 124 (see FIG. 5 ) surrounding the outer periphery of the group of the squeeze foot 123 and the nozzles 114, 114 so as to be movable up and down is provided facing downward at the left and right outer positions of the filling frame 124. 125 and 125 are connected to each other. Further, an exhaust control means (not shown) for controlling the exhaust amount of the compressed air from the inside of the filling frame 124 is mounted on the top of the filling frame 124. A carry-in / out conveyor 132 for the casting frame 131 is suspended from left and right outer positions of the sand hopper 109 in the lifting support frame 103 via frames 130 and 130 extending to a position below the squeeze foot 123. Yes.
[0025]
Next, the operation of molding the driving mold with the molding apparatus configured as described above will be described in detail. In FIG. 5, the foundry sand S is put into the sand hopper 109, and the entire squeeze foot 123 forms unevenness relative to the unevenness of the lower pattern plate 105 </ b> A, and an empty casting frame 131 is carried into the carry-in / out conveyor 132. In a state before the molding start.
The pattern carrier 106 is pulled down by the carrier clamp K from a state where it is lifted by about 5 mm by a spring (not shown) on the pattern changer 104 and set on the molding substrate 101. The die frame 108 is protruded upward from the parting surface of the pattern plate 105A by the pulling cylinders 107 and 107.
[0026]
In this state, the slide gate 115 is actuated to close the sand inlet 116, and then the filling cylinders 125, 125 are extended to lower the filling frame 124 so as to press and adhere to the upper surface of the casting frame 131 and set the frame. The cylinders 102 and 102 are contracted, and the casting frame 131 is pressed onto the die-cutting frame 108A protruding upward on the outer periphery of the pattern plate 105A, and is crimped onto the molding base 101.
[0027]
At this time, the mold making space defined by the pattern plate 105, the die-cutting frame 108, the casting frame 131, the filling frame 124, the sand hopper 109, and the squeeze foot 123 is an uneven shape in which the squeeze foot 123 is opposed to the unevenness of the pattern plate 105. It will be in the state formed. In order to form a casting mold, the bottom surface of the sand hopper 109 is positioned below the lower end of the filling frame 124 (FIG. 6).
[0028]
Next, by a compression air jetting means, a suitable low pressure compression air is jetted from the plurality of multi-hole plates into the forked lower hollow chamber 113, respectively, and the foundry sand in the forked lower hollow chamber 113 is discharged. A pressured air is supplied to the sand hopper 109 while airing to float and fluidize S, and the molding sand S is filled with air into the mold making space via the nozzles 114 and 114 (FIG. 7). ). At this time, the air at the time of filling the air is exhausted from the vent holes (not shown) of the vent holes 129 and 129 and / or the pattern plate 105A.
[0029]
At this time, the hollow chamber 127 is appropriately opened and closed at an arbitrary timing by an exhaust control means (not shown) to control the exhaust amount of the air from the filling frame 124. Thereby, the filling density of the foundry sand S of the complicated shape part of the pattern plate 105A in the mold making space can be partially adjusted. As a result, the foundry sand S is accurately filled in a required state to every corner of the mold making space.
[0030]
Next, the frame set cylinders 102 and 102 are further contracted to lower the elevating frame cylinders 125 and 125 while lowering the elevating support frame 103 and the members supported thereby, and the lower surface of the squeeze foot 123. The sand squeeze S is primarily squeezed until the entire surface becomes flat, and the slide gate 115 is reversely operated to open the sand inlet 116.
[0031]
Next, the working fluid of the pull-out cylinders 107 and 107 is switched to a state in which the working fluid is relieved and the frame setting cylinders 102 and 102 are contracted at a pressure higher than that of the primary squeeze, so that the casting frame 131, the filling frame 124, and the squeeze foot 123 are operated. Etc. are integrally lowered and the entire foundry sand S is secondarily squeezed.
That is, the mold hopper is entered into the casting frame by compressing the foundry sand by simultaneously contracting the frame set cylinder and lowering the leveling frame, and simultaneously contracting the squeeze foot, and the mold back is flat, and A casting mold is formed from the casting frame (FIG. 8).
[0032]
Next, in FIG. 9, the frame setting cylinders 102 and 102 are reversely operated while the drawing cylinders 107 and 107A are extended to press the casting frame 131 against the filling frame 124 through the cutting frames 108 and 108A. To do. At this time, the filling frame cylinders 125, 125 are raised together with the casting frame 131, the squeeze foot 123, and the like.
[0033]
Thereafter, the casting frame 131 formed from the mold is pulled up and supported by the pulling cylinders 107 and 107 through the punching frame 108, while the filling frame 124 and the squeeze foot 123 are raised together. In the middle, the casting frame 131 formed with a mold is scooped up by the carry-in / out conveyor 132 and completely separated from the pattern plate 105A (FIG. 9). At the same time, the foundry sand S is supplied into the sand hopper 109.
[0034]
Next, the casting mold 131 formed with the mold is unloaded via the loading / unloading conveyor 132, and the empty casting frame 131 is loaded, and the pattern exchanging device 104 is operated by an actuator (not shown) and the pattern plate 105 The pattern plate 105A can be replaced (FIG. 10). Further, the squeeze foot 123 is actuated to form irregularities corresponding to the irregularities of the pattern plate 105, and the above operation is repeated.
[0035]
The upper mold and the lower mold with the cast frame formed in this way are overlaid so that the die-matching surface is flat (FIG. 1) . The superimposed upper and lower molds with cast frames are transported and moved to the pouring position.
[0036]
At the pouring position, a part of the pouring platen is configured to be higher in the space created by making the vertical position of the lower mold back of the lower mold higher than the peripheral edge of the lower casting frame opening before moving. because it has placed a vertical mold support the lower mold in the molten metal pouring constant Edition, and sprue cup arranged as required, to the left pouring.
[0037]
[0038]
Alternatively, the height of a part of the pouring platen may be adjusted using a spring or the like.
[0039]
[ Effect of the invention]
As apparent from the above description, the onset Ming, can reduce the foundry sand by molding the lower mold (implantation mold) tall with a combined cope flask into small again casting. In the present invention, the lower mold is supported by a pouring platen that is partially configured to be conveyed and poured, so that there is no deformation or collapse of the mold during conveyance or during pouring.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a conveyance state of a framed mold as a reference example of the present invention.
FIG. 2 is a schematic view showing a conveyance state of a framed mold as another reference example of the present invention.
Figure 3 is a schematic diagram showing a conveying state of the framed mold according to the present invention.
FIG. 4 is a schematic view showing a conveyance state of a framed mold as a further reference example of the present invention.

FIG. 5 is a schematic view of a state before the start of the molding apparatus for realizing the pouring method of the present invention.

FIG. 6 is a schematic view of a state in which a molding space of a molding apparatus for realizing the pouring method of the present invention is defined.
FIG. 7 is a schematic view of a molding apparatus for realizing the pouring method of the present invention in a state of being filled with sand.

FIG. 8 is a schematic view showing a state where compression of the molding apparatus for realizing the pouring method of the present invention is completed.

FIG. 9 is a schematic view of a state in which a mold making apparatus for realizing the pouring method of the present invention is removed.

FIG. 10 is a schematic view of a state before molding the next mold of the molding apparatus for realizing the pouring method of the present invention.
[Explanation of symbols]
1 pouring plate 2 the drag flask 2a drag flask open peripheral end face 3 the lower mold 3a lower mold back 4 the cope flask 4a on flasks open peripheral end face 5 upper mold 5a on the template back 105 pattern plate 106 cutting die frame - arm 131 Casting frame 124 Filling frame 109 Sand hopper 123 Squeeze foot

Claims (1)

Filling the molding space consisting of the pattern plate for the lower mold , the leveling frame, the lower casting frame, the bottom surface of the sand hopper and the squeeze foot in accordance with the pattern shape with the sand blowing nozzle from the sand blowing nozzle, and the frame The mold hopper is compressed by the set cylinder contraction and the leveling frame descending, and at the same time the squeeze foot is contracted, and the sand hopper enters the lower cast frame, and the mold back surface is flat and the mold Forming a lower mold with a cast frame in which the vertical position of the back surface is inside the opening peripheral end surface of the lower cast frame ; and
A step of filling the molding space consisting of an upper mold pattern plate, a leveling frame, an upper casting frame, a sand hopper bottom surface and a squeeze foot in accordance with the pattern shape with air blowing from a sand blowing nozzle, and a frame; The molding hopper is compressed by the set cylinder contraction and the leveling frame is lowered, and at the same time the squeeze foot is contracted so that the sand hopper enters the upper casting frame. A step of forming an upper mold with a casting frame in which the vertical position of the back surface is inside the opening peripheral end surface of the upper casting frame;
After reversing the lower mold with the casting frame, a part of the vertical position of the mold rear surface of the lower casting mold with the casting frame is set to be inside the opening peripheral end surface of the lower casting frame, and a part thereof is made higher than the depth of the space. A process of placing on a configured pouring platen;
A process of superimposing the upper mold with a casting frame on the lower mold with a casting frame such that the parting surface of the lower mold with the casting frame and the parting surface of the upper mold with the casting frame are brought into contact with each other so that the die-matching surface is flat. When,
Supporting the upper and lower casting molds with the cast frames supported by the pouring platen and moving them to a pouring position;
A process of pouring the upper and lower molds with the cast frame
Pouring method that flask mold to comprising a.

Images