JP7064797B2 - Frameless molding cast frame - Google Patents

Description

The present invention relates to a frameless molding casting frame in which a model is molded by an upper casting frame and a lower casting frame incorporated as a part of the molding apparatus in the molding apparatus to form a mold.

Conventionally, a molding cast frame used when manufacturing a mold by a frameless molding apparatus is incorporated in the molding apparatus as a part of the molding apparatus. Therefore, the mold is manufactured by repeatedly using a small number of molding frames. Molding during casting sand compression (squeeze play) in the molding work where a model is placed in the casting frame and filled with casting sand, and when the mold is pulled out from the molding casting frame with the upper and lower molding casting frames combined. Large friction is generated on the mold forming surface of the casting frame.
In the frameless molding device, since the number of built-in molding casting frames is small, the same molding casting frame is used more frequently, and the amount of wear at the place where friction occurs increases. This wear is uneven wear that is not uniform and is partially unevenly worn, and when the amount of wear is large, when the mold is pulled out from the molding cast frame, the upper and lower molds are misaligned. A mold molded from a worn molding cast frame has a drum-shaped outer peripheral surface, and there is a gap between the inner surface of the rectangular jacket (covering frame) used for pouring and the outer wall of the mold, and the pressure of the molten metal poured. Deforms the mold and causes poor product accuracy.

Therefore, as shown in Patent Document 1, an inner coating plate that can be separated from the main body of the molding casting frame is provided on the mold forming surface (inner surface) side of the molding casting frame, and the inner coating plate is worn as the amount of wear increases due to use. The inner plate is replaced to reduce the cost of replacing parts.

Utility Model Registration No. 3175734

However, in the frameless molding cast frame of Patent Document 1, a taper inner plate is adopted. Therefore, the upper and lower inner pasting plates have become replacement parts with high manufacturing cost, which requires processing of the entire surface of one surface, which requires a lot of manufacturing time.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a frameless molding cast frame provided with an inner coating plate which does not require manufacturing labor and whose manufacturing cost as a replacement part is extremely low. It is to be.

To form an upper casting frame that is formed in a square cylinder shape and stacked on an upper mold model platen to form an upper mold, and to form a lower mold that is formed in a square cylinder shape and stacked on a lower mold model platen. A frameless molding cast frame provided with a lower cast frame, wherein the upper cast frame has four upper cast frames for forming a rectangular opening space with a predetermined width from the upper end of the upper cast frame. The rectangular inner wall surface portion and the four upper cast frame trapezoidal inner wall surface portions for forming a square cone trapezoidal molding space that is continuously provided on the upper cast frame rectangular inner wall surface portion and expands downward. The lower cast frame is provided with four lower casts for forming a square cone trapezoidal molding space that expands downward from the upper end of the lower cast frame in a state of being overlapped below the upper cast frame. The frame base shape inner wall surface portion and four lower cast frame rectangular inner wall surface portions for forming a rectangular opening space continuous with the lower cast frame base shape inner wall surface portion to the lower end of the lower cast frame are provided. On the inner wall surface of each upper cast frame trapezoid, a trapezoidal inner wall surface for upper cast frame formed in a trapezoidal shape and having a uniform thickness is detachably attached to each of the upper cast frame trapezoidal inner wall surfaces. A trapezoidal inner sticker for a lower cast frame, which is formed in the shape of a trapezoidal plate and has a uniform thickness, is detachably attached to the inner sticker, and is formed by the trapezoidal inner sticker for the upper and lower cast frames. At each corner of the molding space in the circumferential direction, the adjacent inner pasting plates are in contact with each other without a gap.

According to the first aspect of the present invention, the trapezoidal inner plate for upper and lower cast frames is a plate material having a uniform thickness corresponding to the shape of the inner wall surface of the trapezoidal shape of the upper and lower cast frames. As a result, the inner sticker plate, which has to be replaced due to wear due to use, can be replaced at a low manufacturing cost without the need for tapering as in the conventional case.

It is a schematic diagram which shows the embodiment of the mold molding apparatus using the frameless molding casting frame of this invention. It is sectional drawing which shows the frameless molding casting frame. FIG. 2 is a sectional view taken along line III-III in FIG. FIG. 3 is an enlarged view of IV in FIG. It is a V enlarged view in FIG. FIG. 2 is an enlarged view of VI in FIG. It is an enlarged view of the joint portion between the upper end surface of the trapezoidal inner plate for the lower casting frame and the lower surface of the match plate. It is sectional drawing which shows the state in which the upper and lower molds are overlapped. It is a figure which shows the process of putting casting sand into the upper casting frame in a frame set / die cutting station, and shows the state which the upper mold and the lower mold separated from a match plate are waiting in a frame alignment / frame cutting station. .. It is a figure which shows the process of setting the polymerized casting frame which the casting sand was put into the upper casting frame in the reversing apparatus. It is a figure which shows the process of inverting the lower casting frame and the upper casting frame upside down. It is a figure which shows the process of putting a casting sand into a lower casting frame. It is a figure which shows the process of moving a squeeze head to a molding station. It is a figure which shows the process of lowering a squeeze head. It is a figure which shows the process of squeezing the casting sand in the upper casting frame and the lower casting frame at the same time by a squeeze head. It is a figure which shows the process of raising a squeeze head in a molding station, and also shows the process just before removing the upper mold and the lower mold from the upper and lower cast frames in a frame alignment / frame removal station. At the molding station, the process of turning the upper casting frame and the lower casting frame upside down is shown, and at the frame alignment / frame removal station, the upper mold and the lower mold removed from the upper and lower casting frames are combined to complete the mold. It is a figure which shows the state. It is a figure which shows the process of separating the upper casting frame, the match plate and the lower casting frame in a frame set / die cutting station. The process of moving the upper casting frame and the lower casting frame to the frame alignment / cutting station is shown, and the process of moving the upper and lower casting frames from which the mold has been extracted to the frame setting / die cutting station to make a polymerized casting frame. It is a figure which shows. It is a figure which shows another example of the frameless molding casting frame. It is a front view of another example of a mold molding apparatus using a frameless mold casting frame. It is a side view of another example of a mold molding apparatus using a frameless mold casting frame.

(Embodiment)
An embodiment of a mold molding apparatus using a frameless casting frame according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the mold molding apparatus 2 includes a machine frame 10 including a base 4, a rectangular frame-shaped top frame 6, and a support column 8 provided at an end of the base 4 and supporting the top frame 6. It is provided with a molding station mst, a frame set / die cutting station fst, and a frame matching / frame cutting station tst, which are supported by the machine frame 10 and arranged in order. The horizontal direction in which the stations mst, fst, and tst are lined up is defined as the X direction.
The mold molding device 2 further includes a shuttle cylinder 86 for moving the casting sand input device 26 and the squeeze device 24 along the X direction, and an upper casting frame 19 (first and second upper casting frames 191, 192). -The upper turntable 114 to be moved between the die-cutting station fst and the frame alignment-frame-cutting station tst, and the lower casting frame 23 (first and second lower casting frames 231,232) are frame-set.-Die-cutting station fst. It is equipped with a lower turntable 106 that is moved between the frame alignment / frame removal station tst and the frame alignment / frame removal station tst.

(Molding station)
As shown in FIG. 1, the molding station mst includes an inversion device 22 that inverts the upper casting frame 19 and the lower casting frame 23, which are stacked on the match plate 21 and into which the casting sand MS is charged, and the upper casting frame 19 and the lower. A casting sand charging device 26 for charging the casting sand MS into the casting frame 23, and a squeezing device 24 for squeezing the casting sand MS charged into the frames of the upper casting frame 19 and the lower casting frame 23 into which the casting sand MS is charged. , The casting frame lateral moving device 28 for laterally moving the superposed casting frame 20 (see FIG. 2) formed by stacking the upper casting frame 19, the lower casting frame 23, and the match plate 21. When the squeeze device 24 is positioned at the molding station mst, the position between the squeeze device 24 and the reversing device 22 is the molding position msp. The upper surface 21u of the match plate 21 corresponds to the upper model surface plate on which the upper model Ma is arranged, and the lower surface 21d of the match plate 21 is the lower model surface plate on which the lower model Mb is arranged. Corresponds to.

(Reversing device)
The reversing device 22 is rotatably supported by bearing members (not shown) fixed as a set of two at the lower ends of the hanging members (not shown) hanging from both ends of the top frame 6 at predetermined intervals. A pair of rotating shafts 32, a pair of vertical wall portions 34 that are integrally supported by the rotating shaft 32 and have an arc edge along a rotation locus at the lower portion, and a pair horizontally at the lower portion of the vertical wall portion 34. It is provided with a plurality of roller members 36 arranged side by side, and a support plate 38 erected between the vertical wall portions 34 at the upper part of the paired vertical wall portions 34.
An external gear (not shown) is provided around the rotating shaft 32, and a rack (not shown) is meshed with the external gear to form a pinion rack mechanism. The rack is driven by an air cylinder device (not shown). The rotating device is composed of the rotating shaft 32, the external gear, the rack, and the air cylinder device.
An air cylinder 40 as an advancing / retreating device is provided at the center of the support plate 38, and a holding plate 42 is provided at the tip of the air cylinder 40. The presser plate 42 moves in the direction of the opposing roller member 36 due to the advancement of the air cylinder 40. On the upper surface of the presser plate 42, four guide rods 44 projecting toward the support plate 38 are provided. Each guide rod 44 is guided by a guide hole (not shown) formed in the support plate 38, and the presser plate 42 is brought close to and separated from the support plate 38 in parallel. The air cylinder 40 is communicated with an air pump (not shown), and its operation is controlled by opening / closing a solenoid valve (not shown) provided between the air pump and the air cylinder 40. Upper casting frame support members 50 are attached to the four corners of the presser plate 42. The upper casting frame support member 50 includes a bottomed tubular member 46 having an opening on one side, and a rod member 48 that is fitted into the tubular member 46 and moves in and out of the opening of the tubular member 46. There is.
The presser plate 42 is provided with a guide hole (not shown), and the tubular member 46 is fixed at the opening on the peripheral edge of the guide hole (not shown). A flange portion (not shown) is provided around the base end portion side of the rod member 48, and the forward end of the rod member 48 is restricted by the flange portion contacting the peripheral edge of the guide hole. The tubular member 46 accommodates a metal spring (not shown) whose one end abuts on the bottom surface of the tubular member 46, and the other end of the metal spring abuts on a flange portion provided on the rod member 48. As a result, the rod member 48 is urged in the forward direction. The rod member 48 is slidably guided by a guide hole, and the tip tapered portion (not shown) provided on the rod member 48 engages with the tapered hole (not shown) formed at the end edge of the upper casting frame 19. Then, when the rod member 48 comes into contact with the edge portion of the upper casting frame 19, the upper casting frame 19 is positioned in the horizontal direction. A sand presser plate 54 is provided at the center of the lower surface of the presser plate 42, and the sand presser plate 54 is formed in a square cross section (square cross section) that can be fitted into the inner circumference of the upper casting frame 19.

As shown in FIG. 1, a regulating pillar 53 is projected from the base 4 below the reversing device 22, and a guide rod of the holding plate 42 is provided at the upper end of the regulating pillar 53 when squeezed by the squeeze device 24. Four regulating members 55 facing each other through a gap are provided so as to project from the 44. Due to this gap, when the reversing device 22 is turned over, it does not hit the regulating member 55.

(Squeeze device)
The squeeze device 24 includes a support frame 60 formed in a three-dimensional rectangular shape, provided with wheels (not shown) moving on a transport rail (not shown) extending in the X direction on the upper surface of the top frame 6 at the lower four corners. Have. A squeeze cylinder 62 as an elevating device is fixed to the center of the upper part of the support frame 60 via a mounting bracket 64 by bolts or the like (not shown). The squeeze cylinder 62 is provided with a piston portion 66 projecting downward, and a squeeze plate (squeeze member) 68 fitted into the inner circumference of the lower casting frame 23 is provided at the lower end portion of the piston portion 66 via a holding plate (not shown). It is provided. On both sides of the squeeze cylinder 62, a pair of guides (not shown) that are fixed to the support frame 60 by the mounting bracket 64 and extend in the vertical direction are provided. The squeeze cylinder 62 communicates with an air pump (not shown), and its operation is controlled by opening / closing a solenoid valve (not shown) provided between the air pump and the squeeze cylinder 62.

(Casting sand input device)
As shown in FIG. 1, the casting sand input device 26 stores the casting sand MS required for molding at one time as one unit, and abuts on the upper surface of any of the upper and lower casting frames 19 and 23 to form a molding space. A hopper 74 for charging the cast sand MS into the BS (UBS, DBS) and the opening space OS (UOS, DOS) is provided. The hopper 74 has a shooter portion 76 that abuts on the upper surfaces of the upper and lower cast frames 19 and 23, and a plurality of gate plates 80 that vertically partition the inside of the outer peripheral wall 78 are supported on the outer peripheral wall 78 above the shooter portion 76. Has been done. Above the gate plate 80 is a sand measuring unit 82 for storing the cast sand MS. Casting sand MS is conveyed and stored in the sand measuring unit 82 by a conveyor device (not shown).
The gate plate 80 is rotated about the horizontal axis by a rotating device (not shown), and when the gate plate 80 is positioned in the horizontal position, the inner center of the outer peripheral wall 78 is partitioned up and down so that the cast sand MS can be stored. When the gate plate 80 is rotated and positioned in a vertical position, the stored casting sand MS falls and is charged into the molding space BS (UBS, DBS) formed by the upper casting frame 19 or the lower casting frame 23. Ru. The hopper 74 is fixed to the horizontal frame 84 extending from the support frame 60, and the horizontal frame 84 is provided with wheels (not shown) that roll on the transport rail. The hopper 74 and the squeeze device 24 move between the molding station mst and the frame set / die cutting station fst by driving the shuttle cylinder 86 provided at the end of the top frame 6 (the right end in FIG. 1). Positioned in position. The shuttle cylinder 86 is communicated with an air pump (not shown), and its operation is controlled by opening / closing a solenoid valve (not shown) provided between the air pump and the shuttle cylinder 86.

(Cast frame lateral movement device)
As shown in FIG. 1, the casting frame lateral movement device 28 includes a pair of guide frames 88 extending in the X direction, and the guide frames 88 are aligned when the roller member 36 of the reversing device 22 is positioned downward. An alignment roller portion 90 that enables this is provided. A clamp carriage 92 for clamping and unclamping the polymerized cast frame 20 is provided on the alignment roller portion 90 so as to be horizontally movable, and the clamp carriage 92 is driven by a horizontal cylinder 94 provided at one end of the guide frame 88. .. The horizontal cylinder 94 communicates with an air pump (not shown), and its operation is controlled by opening / closing a solenoid valve (not shown) provided between the air pump and the horizontal cylinder 94. The clamp carriage 92 is provided with a clamp claw 96 to which the base end portion is supported, and the tip portion of the clamp claw 96 can be engaged with and detached from the locked portion (not shown) of the polymerized casting frame 20 (lower casting frame 23). It has become. The clamp carriage 92 is provided so as to be movable on the alignment roller portion 90 and the roller member 36, and the clamp carriage 92 has a polymerized cast frame 20 locked by a clamp claw 96 between the molding station mst and the frame set / die cutting station fst. To move.

(Polymerized casting frame (frameless molding casting frame))
As shown in FIG. 2, the polymerized cast frame 20 in which the casting sand MS is filled to form the mold MD (upper mold MDa, lower mold MDb) (see FIGS. 8 and 17) has the upper surface of the match plate 21 at the lower end. A square tubular upper casting frame 19 stacked on 21u (upper model platen) and a square tubular lower casting frame 23 stacked on the lower surface 21d (lower mold model platen) of the match plate 21 at the upper end. It is equipped with. In the present specification and claims, "square" means a quadrangle including a square and a rectangle. The frameless molding cast frame 1 is mainly composed of an upper cast frame 19, a match plate 21, and a lower cast frame 23, and a superposed product thereof is a polymerized cast frame 20.

(Top casting frame)
As shown in FIG. 2, the upper casting frame 19 is formed of, for example, a substantially rectangular cylinder from an iron member, is provided with a predetermined width from the upper end, and has four upper castings for forming an upper rectangular parallelepiped opening space UOS. The frame rectangular inner wall surface portion 19a is provided. The rectangular inner wall surface portion 19a of the upper cast frame includes the upper inner wall surface 19 mv of the upper cast frame main body 19 m and the rectangular inner wall surface portion 19 c for the upper cast frame, which will be described later. In the present specification and claims, "cuboid" includes a cube, and "rectangle" includes "square".
Further, the upper cast frame 19 has four upper cast frame trapezoidal inner wall surface portions for forming a square hanging trapezoidal molding space UBS that is continuously provided on the upper cast frame rectangular inner wall surface portion 19a and expands downward. It is equipped with 19b. The upper cast frame trapezoidal inner wall surface portion 19b includes an inclined inner wall surface 19 ms at the lower part of the upper cast frame main body 19 m and a trapezoidal inner wall surface portion 19d for the upper cast frame described later. In the present specification and claims, "for forming the molding space UBS" is not limited to the one that directly partitions the molding space BS, but refers to the basic surface for forming the molding space BS (UBS, DBS). Including what to build. The same applies to the open space OS (UOS, DOS).

As shown in FIG. 5, each upper cast frame rectangular inner wall surface portion 19a is provided with, for example, a rectangular inner plate 19c made of a standard steel plate having a uniform thickness of 5 mm and formed in a rectangular plate shape. However, they are detachably attached by bolts 195 and nuts 196, respectively. As shown in FIG. 2, the mold forming surface 19c3 of the rectangular inner pasting plate 19c for the upper casting frame is provided with through holes 19c2 having countersunk holes processed at four locations arranged in the circumferential direction. The rectangular inner wall surface portion 19a of the upper cast frame is provided with a through hole 19a2 corresponding to the through hole 19c2 so as to penetrate to the outer peripheral surface of the upper cast frame main body 19 m. The rectangular inner wall surface 19c for the upper cast frame is one-to-one with the rectangular inner wall surface portion 19a of the upper cast frame by the bolt 195 inserted into the through hole 19a2 and the through hole 19c2 and the nut 196 screwed into the bolt 195. It is pasted. In the rectangular inner plate 19c for the upper casting frame, the head 195a of the countersunk bolt 195 is prevented from protruding toward the mold forming surface side by countersunk hole processing.

Of the rectangular inner pasting plates 19c for the entire upper casting frame, each corner 19c1 of the opening space UOS formed by the rectangular inner pasting plate 19c for the upper casting frame adjacent in the circumferential direction is shown as a substitute in FIG. As described above, the adjacent rectangular inner plates 19c for the upper casting frame are in contact with each other without a gap. In each corner 19c1, only one end face 19c4 of the end faces on both sides of the rectangular inner sticking plate 19c for the upper casting frame is the end of the mold forming surface 19c3 of the adjacent rectangular inner sticking plate 19c for the upper casting frame. By contacting the portion, the contact is made without a gap.
For example, when one rectangular inner mounting plate for upper casting frame 19c is shorter than the regular size, the mold forming surface 19c3 of the rectangular inner pasting plate 19c for upper casting frame formed short is adjacent to the upper. To the extent that it can come into contact with the end face 19c4 of the rectangular inner mounting plate 19c for the casting frame, the rectangular inner pasting plate 19c for the upper casting frame is used as the upper casting frame rectangular inner wall surface portion 19a by absorbing a short length error. Can be attached to. There is no gap in the corner portion 19c1 formed by the adjacent rectangular inner pasting plates 19c for the upper casting frame.

As shown in FIGS. 2 and 3, the inner wall surface portion 19b of each upper cast frame trapezoid is, for example, of the upper cast frame trapezoid formed in a trapezoidal shape made of a standard steel plate having a uniform thickness of 5 mm. The sticking plate 19d is detachably attached by bolts 195 and nuts 196, respectively.

As shown in FIG. 2, as shown in FIG. A hole 19d2 is provided. The inner wall surface portion 19b of the upper cast frame trapezoidal shape is also provided with a through hole 19b2 corresponding to the through hole 19d2 of the upper cast frame trapezoidal inner plate 19d so as to penetrate to the outer peripheral surface of the upper cast frame main body 19 m. There is. The trapezoidal inner wall for the upper cast frame 19d is formed in one place by the bolt 195 inserted into the through hole 19b2 and the through hole 19d2 and the nut 196 screwed into the bolt 195. It is attached to the face portion 19b on a one-to-one basis.
As shown in FIGS. 3 and 5, the trapezoidal inner plate 19d for the upper casting frame has a countersunk hole so that the head 195a of the countersunk bolt 195 does not protrude toward the mold forming surface 19d3.

Each corner 19d1 of the molding space UBS formed by the trapezoidal inner plate 19d for the upper cast frame adjacent to the circumferential direction of the trapezoidal inner plate 19d for the entire upper cast frame is shown in FIGS. 3 and 4. As described above, the adjacent trapezoidal inner plates 19d for the upper casting frame are in contact with each other without a gap. In each corner 19d1, only one end surface 19d4 of the end faces on both sides of the upper casting frame trapezoidal inner plate 19d is the end of the mold forming surface 19d3 of the adjacent upper casting frame trapezoidal inner plate 19d. By contacting the portion, it is in contact without a gap.

In the upper casting frame 19, as shown in FIGS. 3 and 4, the upper casting frame corner portion 19e formed between the adjacent upper casting frame rectangular inner wall surface portions 19a has a rectangular inner pasting plate for the upper casting frame. A rectangular inner pasting plate relief groove 19fc for the upper casting frame for allowing the dimensional error and the pasting error of 19c is provided so as to extend along the vertical direction. The upper casting frame corner portion 19e formed between the adjacent upper casting frame trapezoidal inner wall surface portions 19b is for the upper casting frame for allowing the dimensional error and the pasting error of the upper casting frame trapezoidal inner mounting plate 19d. The trapezoidal inner sticker relief groove 19fd is provided so as to extend along the vertical direction.
For example, when one trapezoidal inner plate for upper casting frame 19d is formed longer than the normal size, the long-formed trapezoidal inner plate for upper casting frame 19d has a mold forming surface 19d3. It protrudes outward by an error from the end face 19d4 of the trapezoidal inner plate 19d for the adjacent upper casting frame that is in contact. The length of this protruding error is absorbed by the trapezoidal inner plate relief groove 19fd for the upper cast frame, and the trapezoidal inner plate 19d for the upper cast frame is correctly attached to the inner wall surface portion 19b of the trapezoidal shape of the upper cast frame. You can wear it.

As shown in FIG. 5, the upper casting frame 19 is square in which four strip-shaped upper casting frame end face plates 19g are combined on the mating surface side of the upper casting frame 19 stacked on the upper surface 21u of the match plate 21. Arranged in a frame shape, 23 g of each lower cast frame end face plate is provided so as to be removable by four countersunk head screws 197, respectively. The upper cast frame 19 wears due to contact with the upper surface 21u (model surface plate for upper mold) of the match plate 21 on the mating surface, but it can be easily restored to the state before wear by simply replacing the upper cast frame end face plate 19 g. It can be restored.

(Bottom casting frame)
The lower cast frame 23 is formed in a substantially rectangular cylinder shape from, for example, an iron member, and as shown in FIGS. 2 and 6, in a state of being overlapped below the upper cast frame 19, below the upper end of the lower cast frame 23. It is provided with four lower cast frame trapezoidal inner wall surface portions 23b for forming a quadrangular pyramid trapezoidal molding space DBS that is vast toward it. The lower cast frame trapezoidal inner wall surface portion 23b includes an upper inclined inner wall surface 23 ms of the lower cast frame main body 23 m and a lower cast frame trapezoidal inner wall surface portion 23d, which will be described later.
The lower casting frame 23 is continuous with the lower casting frame trapezoidal inner wall surface portion 23b, and includes four lower casting frame rectangular inner wall surface portions 23a for forming a rectangular parallelepiped opening space DOS up to the lower end of the lower casting frame 23. .. The lower inner wall surface portion 23a having a rectangular shape of the lower cast frame includes the lower inner wall surface 23 mv of the lower cast frame main body 23 m and the rectangular inner wall surface portion 23 c for the lower cast frame, which will be described later.

On the inner wall surface portion 23b of each lower cast frame trapezoid, for example, a trapezoidal inner wall plate 23d made of a standard steel plate having a uniform thickness of 5 mm and formed in a trapezoidal shape is provided with bolts 195 and nuts, respectively. It is detachably attached by 196.

As shown in FIG. 2, as shown in FIG. 2, the mold forming surface 23d3 of the trapezoidal inner plate 23d for the lower casting frame is penetrated by countersunk holes in a total of eight places, two upper and lower stages arranged in four places in the circumferential direction. A hole 23d2 is provided. The lower cast frame trapezoidal inner wall surface portion 23b is also provided with a through hole 23b2 corresponding to the through hole 23d2 of the lower cast frame trapezoidal inner plate 23d so as to penetrate to the outer peripheral surface of the lower cast frame main body 23 m. .. The trapezoidal inner wall for the lower cast frame 23d is formed in one place by the bolt 195 inserted into the through hole 23b2 and the through hole 23d2 and the nut 196 screwed into the bolt 195. It is attached to the face portion 23b on a one-to-one basis.
In the trapezoidal inner plate 23d for the lower casting frame, the head 195a of the countersunk bolt 195 is prevented from protruding toward the mold forming surface 23d3 by countersunk hole processing.

Of the trapezoidal inner plates 23d for all lower cast frames, the corners 23d1 formed by the trapezoidal inner plates 23d for lower cast frames adjacent to each other in the circumferential direction are adjacent to each other as shown in FIG. The trapezoidal inner plates 23d for the lower casting frame are in contact with each other without any gaps. In each corner 23d1, only one end surface 23d4 of the end faces on both sides of the bottom casting frame trapezoidal inner mounting plate 23d is the end of the mold forming surface 23d3 of the adjacent lower casting frame trapezoidal inner pasting plate 23d. It is in contact with the part.

Each lower cast frame rectangular inner wall surface portion 23a is detachably attached to each other. For example, a rectangular inner wall plate for a lower cast frame made of a standard steel plate having a uniform thickness of 5 mm and formed into a rectangular plate shape. 23c is detachably attached by bolts 195 and nuts 196, respectively.

As shown in FIG. 2, the mold forming surface 23c3 of the rectangular inner pasting plate 23c for the lower casting frame is provided with through holes 23c2 having countersunk holes processed at four locations arranged in the circumferential direction. The rectangular inner wall surface portion 23a of the lower cast frame is also provided with a through hole 23a2 corresponding to the through hole 23c2 of the rectangular inner sticking plate 23c for the lower cast frame. The rectangular inner wall for the lower cast frame 23c is formed in one place by the bolt 195 inserted into the through hole 23a2 and the through hole 23c2 and the nut 196 screwed into the bolt 195. It is attached to the face portion 23a on a one-to-one basis.
The rectangular inner plate 23c for the lower casting frame is formed so that the head 195a of the countersunk bolt 195 does not protrude toward the mold forming surface 23c3 side by countersunk hole processing.

Of the rectangular inner pasting plates 23c for all lower casting frames, each corner 23c1 formed by the rectangular inner pasting plate 23c for lower casting frames adjacent in the circumferential direction is adjacent as shown in FIG. 4 as a substitute. The rectangular inner plates 23c for the lower casting frame are in contact with each other without any gap. In each corner 23c1, only one end face 23c4 of the end faces on both sides of the rectangular inner sticking plate 23c for the lower casting frame is the end of the mold forming surface 23c3 of the rectangular inner sticking plate 23c for the lower casting frame. It is in contact with the part.

In the lower casting frame 23, as shown in FIG. 4 as a substitute, the lower casting frame corner portion 23e formed between the adjacent lower casting frame rectangular inner wall surface portions 23a and the adjacent lower casting frame trapezoidal inner wall surface portions 23b. Is a rectangular inner-paste plate relief groove 23fc for the lower cast frame to allow dimensional error and pasting error of the rectangular inner-paste plate 23c for the lower cast frame, and a trapezoidal inner-paste plate 23d for the lower cast frame. The trapezoidal inner plate relief groove 23fd for the lower casting frame is provided so as to extend along the vertical direction in order to allow dimensional error and attachment error. The action of the rectangular inner-paste plate relief groove 23fc for the lower casting frame and the trapezoidal inner-paste plate relief groove 23fd for the lower casting frame is the rectangular inner-paste plate relief groove 19fc for the upper casting frame and the table for the upper casting frame. It is the same as the inner sticker relief groove 19fd of the shape.

As shown in FIG. 6, the lower casting frame 23 is combined with four strip-shaped lower casting frame end face plates 23g on the mating surface side to be stacked on the lower surface 21d (model surface plate for lower mold) of the match plate 21. Each of the lower cast frame end face plates (23 g) is provided in a square frame shape so as to be removable by four countersunk head screws 197. The lower cast frame 23 wears due to contact with the lower surface 21d of the match plate 21 on the mating surface, but it can be easily restored to the state before wear by simply replacing the lower cast frame end face plate 23 g.

(Match plate)
As shown in FIG. 2, the match plate 21 includes an upper mold model surface plate (upper surface 21u of the match plate 21) on which the upper mold model Ma is arranged and the upper casting frame 19 is superposed on the upper surface, and a lower mold model. A lower mold model surface plate (lower surface 21d of the match plate 21) on which Mb is arranged and the lower casting frame 23 is overlapped on the lower surface is joined back to back to form an integral body. It has a rectangular support frame (not shown) with a hole formed in the center and a model holding plate (not shown) locked to a locking edge formed along the hole in the support frame. There is.

(Frame set / die cutting station)
As shown in FIG. 1, the frame set / die-cutting station fst includes an elevating roller base 98 that is guided up and down by the base 4 and a raising and lowering support cylinder 100 that slidably supports the elevating roller base on the base. , Is equipped. Above the elevating roller stand 98, one end of the lower turntable 106, the transport roller 110 into which the match plate 21 is carried, and one end of the upper turntable 114 are positioned as frame sets / die cutting positions fsp.

The elevating roller base 98 has an elevating support cylinder 100 that is slidably supported in a guide hole of the base 4, and the elevating support cylinder 100 is communicated with an air pump (not shown), and is between the air pump and the elevating support cylinder 100. The operation is controlled by opening and closing the solenoid valve shown in the figure. A pair of horizontal frames 102 extending in the X direction are provided at the upper end of the elevating support cylinder 100. A plurality of paired roller pieces 104 are rotatably supported inside the horizontal frame 102. Further, the elevating roller base 98 is provided so as to be aligned with the alignment roller portion 90 at the ascending end.

The lower turntable 106 and the upper turntable 114 located above the lower turntable 106 are the lower end and the upper end of the rotating peripheral wall 113 externally fitted to the rotating support shaft 116 juxtaposed to the elevating roller base 98. Each part is fixed integrally. The rotating peripheral wall 113 and the rotating support shaft 116 are provided so as to be able to rotate relative to each other. The upper turntable 114 and the lower turntable 106 are provided with support arms 115 extending in the horizontal direction on both sides of the rotation support shaft 116, respectively. Support arms 115 facing each other at predetermined intervals are provided on the support arms 115 on both sides, and engaging protrusions (not shown) are provided on the inside of each support wall 117 so as to face each other. The facing support walls 117 are provided so that the upper casting frame 19 or the lower casting frame 23 can be arranged between them, and the engaging protrusions facing each other are engaged with the drawings provided on the upper casting frame 19 and the lower casting frame 23, respectively. The upper casting frame 19 or the lower casting frame 23 is detachably sandwiched between the support walls 117 by engaging the joint portions.
The facing support wall 117 is configured so that the elevating roller base 98 and the mold table 120 described later can pass between them. Further, the rotating peripheral wall 113 is supported by the rotating support shaft 116 via a bearing (not shown), is rotated with respect to the rotating support shaft 116 by a speed reducing device and a motor (not shown), and the rotating peripheral wall 113 is rotated. By doing so, the lower turntable 106 and the upper turntable 114 rotate in synchronization with each other. Then, the lower casting frame 23 or the upper casting frame 19 engaged with the respective support arms 115 is rotationally moved between the frame set / die cutting station fst and the frame alignment / frame cutting station tst.

A pair of orthogonal support frames 108 extending in the Y direction (horizontal direction orthogonal to the X direction) are provided between the lower turntable 106 and the upper turntable 114, and a plurality of transports are provided inside the orthogonal support frame 108. The roller 110 is rotatably supported. The transport roller 110 carries in and out the match plate 21. Above the orthogonal support frame 108, one end of the above-mentioned upper turntable 114 is positioned as a frame set / die cutting position fsp. By raising the elevating roller stand 98 on which the lower casting frame 23 is placed, the match plate 21 mounted on the transport roller 110 and the upper turntable 114 are positioned at the frame set / die cutting position fsp. The polymerized cast frame 20 is formed by superimposing the cast frame 19 on the cast frame 19. The casting frame polymerization apparatus is composed of the elevating roller base 98, the transport roller 110, the lower turntable 106, the upper turntable 114, and the like.

(Frame alignment / frame removal station)
The frame alignment / frame removal station tst includes a mold alignment device 118 including a mold table 120 on which the mold MD is placed and an elevating shaft cylinder 119 that supports the mold table in an ascending / descending manner. Above the mold table 120, the other end of the lower turntable 106 and the other end of the upper turntable 114 are positioned as frame alignment / frame removal positions tsp.

As shown in FIG. 1, the mold matching device 118 has an elevating shaft cylinder 119, and the piston portion of the elevating shaft cylinder 119 is guided so as to be able to move up and down with respect to the base 4. The elevating shaft cylinder 119 is communicated with an air pump (not shown), and its operation is controlled by opening / closing a solenoid valve (not shown) provided between the air pump and the elevating shaft cylinder 119. A mold table 120 on which the mold MD is placed is provided at the upper end of the elevating shaft cylinder 119. Above the upper turntable 114, a mold removing head 122 driven by an air cylinder (not shown) is guided so as to be able to move up and down with respect to the top frame 6. A punching plate 124 is provided at the lower end of the mold punching head 122, and the punching plate 124 is formed so as to be fitted into the inner circumference of the upper casting frame 19.

Above the frame alignment / punching station tst, the casting sand throwing device 26 is connected to the casting sand throwing device 26 and the squeeze device 24, and the casting sand throwing device 26 is moved between the molding station mst and the frame set / die cutting station fst. A shuttle cylinder 86 for positioning and positioning the squeeze device 24 on the molding station mst is provided.
The surface of the upper casting frame trapezoidal inner pasting plate 19d attached to the upper casting frame trapezoidal inner wall surface portion 19b of the upper casting frame 19, the upper surface 21u of the match plate 21, and the upper mold model attached to the upper surface 21u. A molding space UBS for molding the upper mold MDa (see FIGS. 8 and 16) is formed by the surface of Ma (see FIG. 2), and the lower casting is attached to the inner wall surface portion 23b of the lower casting frame trapezoidal shape of the lower casting frame 23. A molding space DBS for molding the lower mold MDb is formed by the surface of the frame trapezoidal inner plate 23d, the lower surface 21d of the match plate 21, and the surface of the lower mold model Mb attached to the lower surface 21d (FIG. 2). reference).
The opening space UOS of the upper casting frame 19 is formed by the rectangular parallelepiped space surrounded by the rectangular inner wall surface portion 19a for the upper casting frame attached to the rectangular inner wall surface portion 19a of the upper casting frame, and the rectangular inner wall surface portion 23a of the lower casting frame is formed. The opening space DOS of the lower casting frame 23 is formed by the rectangular parallelepiped space surrounded by the rectangular inner pasting plate 23c for the lower casting frame attached to the lower casting frame 23.

(Operation)
Next, the operation using the frameless molding cast frame 1 having the above configuration will be described below with reference to the drawings.
The upper casting frame 19 and the lower casting frame 23 constituting the frameless molding casting frame 1 of the present embodiment are the first upper casting frame 191 and the first lower casting frame 191 and the lower casting frame 23 arranged in the frame set / die cutting station fst in FIG. Two sets of a casting frame 231 and a second upper casting frame 192 and a second lower casting frame 232 arranged at the frame alignment / frame removal station tst are prepared. These first and second upper cast frames 191, 192 are upper cast frames 19 of the same type, and the first and second lower cast frames 231 and 232 are lower cast frames 23 of the same type. These first and second upper cast frames 191 and 192 and the first and second lower cast frames 231 and 232 are alternately and repeatedly used for molding. In the match plate 21, a plurality of match plates 21 are arranged on the transport roller 110, and the match plate 21 positioned at a position corresponding to the frame set / die cutting position fsp is frame-matched with the upper cast frame 19 and the lower cast frame 23. It is used for molding. In principle, the same match plate 21 is used until the planned number of molds produced is completed.
The second upper cast frame 192 and the second lower cast frame 232 arranged at the frame alignment / frame removal station tst stand by in a state where the upper mold MDa and the lower mold MDb previously molded are held respectively. There is.

First, in the frame set / die cutting station fst, as shown in FIG. 1, the first lower casting frame 231 is engaged with the lower turntable 106 in order from the bottom, is arranged at the frame set / die cutting position fsp, and is conveyed. A match plate 21 is arranged on the roller 110, and a first upper casting frame 191 is engaged with the upper turntable 114 and arranged at the frame set / die cutting position fsp. The first lower cast frame 231 and the match plate 21 and the first upper cast frame 191 face each other so as to be matable. An elevating roller stand 98 is arranged immediately below the first lower casting frame 231 and a casting sand feeding device 26 (hopper 74) is arranged above the first upper casting frame 191. The casting sand MS to be charged into the first upper casting frame 191 is stored in the sand measuring unit 82 of the casting sand charging device 26. On the other hand, the piston portion of the horizontal cylinder 94 is advanced, and the clamp carriage 92 is positioned on the roller member 36 of the reversing device 22.

Next, the elevating support cylinder 100 is driven to elevate the elevating roller base 98 as shown in FIG. When the lower end of the first lower casting frame 231 comes into contact with the roller piece 104, the engagement of the first lower casting frame 231 with the lower turntable 106 is released, and the first lower casting frame 231 is placed on the elevating roller stand 98. Being raised. When the first lower cast frame 231 passes between the orthogonal support frames 108, the match plate 21 is received from the transport roller 110, and the match plate 21 is superposed on the first lower cast frame 231.
Further, the elevating roller base 98 is raised, and the upper surface of the match plate 21 abuts on the lower end of the first upper casting frame 191 at the rising end of the elevating roller base 98, so that the first upper casting frame 191 and the upper turntable 114 Is disengaged, and the first upper cast frame 191 is superposed on the match plate 21.
In this way, the first upper cast frame 191 and the match plate 21 and the first lower cast frame 231 are superposed to form the polymerized cast frame 20 (see FIG. 2). Then, the gate plate 80 of the casting sand input device 26 is rotated and positioned at a vertical position, and the casting sand MS stored in the sand measuring unit 82 is naturally dropped to match the inner surface of the first upper casting frame 191 and the match plate. The molding space UBS and the opening space UOS formed by the upper surface 21u of 21 and the surface of the upper mold model Ma are filled. At this time, the roller piece 104 is aligned with the aligned roller member 36 and the aligned roller portion 90. Then, by rotating the clamp claw 96 of the clamp carriage 92, the tip thereof is locked to the locked portion of the first lower casting frame 231 (polymerized casting frame 20).

Next, as shown in FIG. 10, the first lower casting frame 231 (polymerized casting frame 20) is molded from the elevating roller stand 98 in the frame set / die cutting station fst by driving the piston portion of the horizontal cylinder 94 to retract. It is moved onto the roller member 36 of the reversing device 22 at the station mst. Then, by rotating the clamp claw 96 in the release direction, the first lower casting frame 231 (polymerized casting frame 20) is released from being locked to the locked portion.
Then, by driving the air cylinder 40 in the forward direction, the sand holding plate 54 is fitted into the inner peripheral portion of the first upper casting frame 191 (polymerized casting frame 20), and the upper surface of the cast sand MS filled inside is filled. Contact with. At this time, the tip end portion of the rod member 48 of the upper cast frame support member 50 is brought into contact with the upper end portion of the first upper cast frame 191. At this time, the tapered portion at the tip of the rod member 48 is fitted into the tapered hole of the first upper casting frame 191. The air cylinder 40 is maintained by being loaded with a light pressure so that the sand presser plate 54 does not come off the inner circumference of the first upper casting frame 191. Since the upper end of the first upper cast frame 191 abuts on the upper cast frame support member 50 and the first lower cast frame 231 is placed on the roller member 36, the polymerized cast frame 20 (first upper cast frame 191). , The match plate 21 and the first lower cast frame 231 are in a state of being sandwiched from above and below by the pressure of the air cylinder 40 at the molding position msp.
Further, in parallel, the gate plate 80 of the hopper 74 is rotated and positioned at a horizontal position, and the amount of the sand measuring portion 82 to be charged into the molding space DBS and the opening space DOS configured by the first lower casting frame 231. The cast sand MS is conveyed and stored by the conveyor device shown in the figure.

Next, as shown in FIG. 11, the reversing device 22 is turned upside down about the rotation shaft 32 (see FIG. 1), so that the polymerization casting frame 20 is turned upside down. The molding space DBS formed by the first lower casting frame 231 is positioned at the upper part, and the lower end portion (upper end portion in FIG. 11) of the first lower casting frame 231 is opened. Further, the lower ends of the four guide rods 44 are in a state of facing the regulating member 55 via the gaps.

Next, as shown in FIG. 12, the piston portion of the shuttle cylinder 86 is driven in the forward direction, and the hopper 74 is moved from the frame set / die cutting station fst to the molding station mst. The lower end opening of the hopper 74 faces the opening of the first lower casting frame 231.
Then, by rotating the gate plate 80 and positioning it in a vertical position, the casting sand MS is naturally dropped from the sand measuring unit 82 and put into the molding space DBS and the opening space DOS formed by the first lower casting frame 231. ..

Next, as shown in FIG. 13, the shuttle cylinder 86 is driven in the retracting direction, the squeeze device 24 is moved to the molding station mst, and the squeeze plate 68 is placed on the casting sand MS filled in the first lower casting frame 231. Make them face each other. Meanwhile, the gate plate 80 of the hopper 74 is rotated to position it in a horizontal position.

Next, as shown in FIG. 14, the squeeze cylinder 62 is driven in the forward direction, and the squeeze plate 68 is fitted into the inner circumference of the first lower casting frame 231.

Next, as shown in FIG. 15, the squeeze plate 68 is further lowered in a state of being in contact with the casting sand MS in the first lower casting frame 231 to reduce the casting sand MS in the first lower casting frame 231. Squeeze.
At this time, the pressure of the squeeze compresses the casting sand MS in the first lower casting frame 231 and the friction between the casting sand MS and the inner surface of the first lower casting frame 231 causes the polymerized casting frame 20 to move downward. Works. Due to this downward force, the polymerized cast frame 20 moves downward against the repulsive force of the metal spring, and the holding plate 42 of the reversing device 22 acts to move downward via the upper cast frame support member 50. Moving downward, the guide rod 44 projecting from the presser plate 42 comes into contact with the regulating member 55.
Then, the guide rod 44 receives a reaction force by the restricting member 55 that moves downward and comes into contact with the guide rod 44, and the reaction force is transmitted to the holding plate 42 via the guide rod 44. Since the sand presser plate 54 is fixed to the presser plate 42, the sand presser plate 54 in contact with the casting sand MS of the first upper cast frame 191 is moved downward by the polymerized cast frame 20 to move the first upper cast frame. Further insert (enter) into 191 and squeeze the cast sand MS in the upper casting frame 19.
In this way, by squeezing the casting sand MS inside the first lower casting frame 231 with the squeeze plate 68, the casting sand MS inside the first upper casting frame 191 can be squeezed at the same time. By squeezing at the same time in this way, the pressure applied to only one surface of the match plate 21 is not biased, and the match plate 21 can be prevented from being deformed or damaged.

Next, as shown in FIG. 16, the squeeze cylinder 62 is driven in the retracting direction to raise the squeeze plate 68, and the squeeze plate 68 is separated from the inner circumference of the lower casting frame 23. At this time, the polymerized casting frame 20 is in a state of being sandwiched from above and below by the roller member 36 and the upper casting frame support member 50.
On the other hand, at the frame alignment / frame removal station tst, the following steps are performed in parallel. By driving the elevating shaft cylinder 119 in the forward direction, the mold table 120 is raised to receive the second lower casting frame 232 from the lower turntable 106. The mold table 120 is fitted into the inner circumference of the second lower casting frame 232 and comes into contact with the lower surface of the mold MDb. Further, by raising the mold table 120 on which the second lower casting frame 232 is placed, the second lower casting frame 232 is superposed on the second upper casting frame 192 placed on the upper turntable 114. Then, the punched plate 124 of the mold punching head 122 is fitted into the inner circumference of the second upper casting frame 192, and the molds are aligned by matching the upper mold MDa and the lower mold MDb.

Next, as shown in FIG. 17, by rotating the reversing device 22 180 degrees, the polymerized casting frame 20 is turned upside down, and the first upper casting frame 191 is positioned upward and the first lower casting frame 231 is positioned downward. do. Then, by rotating the clamp claw 96 of the clamp carriage 92, the tip is locked to the locked portion of the first lower casting frame 231. At the same time, the alignment roller portion 90, the roller member 36 of the reversing device 22, and the roller piece 104 of the elevating roller base 98 are aligned.
On the other hand, at the frame alignment / frame removal station tst, the following steps are performed in parallel. The mold table 120 is lowered, and the upper mold MDa is extracted from the second upper casting frame 192 engaged with the upper turntable 114 to remove the frame. By further lowering the mold table 120 on which the upper mold MDa, the second lower casting frame 232 and the lower mold MDb are placed, the lower mold MDb is taken out from the second lower casting frame 232 at the position of the lower turntable 106. The frame is removed to complete the mold MD in which the upper and lower molds MDa and MDb are overlapped. Then, the completed mold MD is carried out to the storage warehouse by the conveyor shown in the figure.

In the molding station mst, the following steps are performed on the polymerized casting frame 20 composed of the first upper casting frame 191 and the first lower casting frame 231.
By driving the horizontal cylinder 94 in the forward direction and moving the clamp carriage 92 to the roller member 36, the polymerized cast frame 20 is moved to the frame set / die cutting station fst frame set / die cutting position fsp. At that time, the first upper casting frame 191 is inserted between the facing support walls 117. Then, by lowering the elevating roller base 98 from the ascending end, the engaged portion of the first upper cast frame 191 is engaged with the engaging projection of the support wall 117 of the upper turntable 114, and the upper turntable 114 is subjected to the first engagement. The top casting frame 191 is fixed.

Then, as shown in FIG. 18, the match plate 21 is received by the transport roller 110 of the orthogonal support frame 108 by further lowering the elevating roller base 98 on which the match plate 21 and the first lower casting frame 231 are placed. Let me accept. Then, the elevating roller base 98 on which only the first lower casting frame 231 is placed is further lowered, and the engaged portion of the first lower casting frame 231 is engaged with the engaging portion of the lower turntable 106.
The match plate 21 placed on the transport roller 110 is continuously placed in the frame set position and used repeatedly until the planned production number of the mold MD is completed. When the production of the mold MD of the planned production number is completed, the mold MD is carried out to the storage cabinet (not shown), and the match plate 21 in which the new model M is set is carried in to the frame setting position of the transport roller 110. ..

Next, as shown in FIG. 19, the lower turntable 106 and the upper turntable 114 are rotated 180 degrees in the horizontal direction, and the first upper cast frame 191 and the first lower cast frame 231 are used as the frame alignment / frame removal station tst. Move it and position it at the frame alignment / frame removal position tsp. The first upper casting frame 191 and the first lower casting frame 231 undergo the same steps as the second upper casting frame 192 and the second lower casting frame 232 in FIGS. 12 to 13, and the mold MD is framed out to form a mold. It is carried out in the combined state.

As shown in FIG. 19, the second upper cast frame 192 and the second lower cast frame 232 from which the mold MD is extracted in FIG. 17 are frame set by rotating the upper and lower turntables 106 and 114 by 180 degrees. It is moved to the die-cutting station fst and superposed on the match plate 21 placed on the transport roller 110 to form the polymerized cast frame 20. The same molding process is repeated thereafter.

(Replacement of inner sticker)
The inner pasting plates 19c, 19d, 23c, 23d are the inner pasting plates 19c, 19d, at the time of squeeze performed by the squeeze device 24 after the casting sand MS is put into the upper casting frame 19 and the lower casting frame 23 (see FIG. 15). It wears due to high pressure contact between 23c and 23d and the cast sand MS.
Further, the inner pasting plates 19c, 19d, 23c, 23d are used in the work of mold-matching the upper mold MDa and the lower mold MDb at the frame fitting / frame-cutting station tst and then simultaneously pulling them out from the upper casting frame 19 and the lower casting frame 23 (. (See FIGS. 16 and 17), the cast sand MS on the surfaces of the upper mold MDa and the lower mold MDb and the inner pasting plates 19c, 19d, 23c, 23d are rubbed and worn.
The worker performing the replacement work removes only one of the worn inner plates 19c, 19d, 23c, and 23d from the upper casting frame 19 or the lower casting frame 23 by releasing the fastening with the bolt 195 and the nut 196. Replace with new inner plates 19c, 19d, 23c, 23d and fasten with bolts 195 and nuts 196. Since the inner pasting plates 19c, 19d, 23c, 23d are standard steel plates having a uniform thickness, the inner pasting plates 19c, 19d, 23c, 23d having a low unit price can be easily replaced.

As is clear from the above description, the frameless molding cast frame 1 of the present embodiment is formed in a square cylinder shape and is superposed on the upper surface 21u (model surface plate for upper mold) of the match plate 21 to form the upper mold MDa. It is provided with an upper casting frame 19 for molding and a lower casting frame 23 for molding a lower mold MDb which is formed in a square cylinder shape and is superposed on a lower surface 21d (model surface plate for lower mold) of a match plate 21. It is a frameless molding cast frame 1.
The upper casting frame 19 (191, 192) includes four upper casting frame rectangular inner wall surface portions 19a for forming a rectangular parallelepiped opening space OS (UOS) with a predetermined width from the upper end of the upper casting frame 19, and an upper casting frame. It is provided with four upper cast frame trapezoidal inner wall surface portions 19b for forming a quadrangular pyramid trapezoidal molding space BS (UBS) that is continuously provided on the rectangular inner wall surface portion 19a and expands downward.
The lower cast frame 23 (231,232) has a quadrangular pyramid-shaped molding space BS (DBS) that expands downward from the upper end of the lower cast frame 23 in a state of being overlapped below the upper cast frame 19. Four for forming a rectangular parallelepiped opening space OS (DOS) continuous with the inner wall surface portion 23b of the lower cast frame trapezoidal shape and the inner wall surface portion 23b of the lower cast frame trapezoidal shape to the lower end of the lower cast frame 23. A lower cast frame rectangular inner wall surface portion 23a is provided.
On the inner wall surface portion 19b of each upper cast frame trapezoid, a trapezoidal inner wall surface 19d for upper cast frame, which is formed in a trapezoidal shape and has a uniform thickness, is detachably attached to each lower cast frame trapezoid inner wall. A trapezoidal inner sticker plate 23d for a lower cast frame, which is formed in a trapezoidal shape and has a uniform thickness, is detachably attached to the face portion 23b, respectively. In each corner portion 19d1, 23d1 in the circumferential direction of the molding space BS (UBS, DBS) formed by 23d, adjacent inner pasting plates 19d and 23d are in contact with each other without a gap.

According to this, the inner pasting plates 19d and 23d of the trapezoidal shape for the upper and lower casting frames are plate materials having a uniform thickness corresponding to the shapes of the inner wall surface portions 19b and 23b of the trapezoidal shape of the upper and lower casting frames. As a result, the inner pasting plates 19d and 23d, which had to be replaced due to wear due to use, can be replaced at a low manufacturing cost without the need for tapering as in the conventional case. The corners 19d1, 23d1 in the circumferential direction of the molding space BS (UBS, DBS) are formed on the surfaces of the molds MDa and MDb without the casting sand MS entering the gaps between the inner pasting plates 19d and 23d adjacent to each other in the circumferential direction. It does not cause burrs and does not cause surface collapse.

Further, the inclination angle of the inner wall surface portion 19b of the upper casting frame base shape and the inner wall surface portion 23b of the lower casting frame base shape is 3 to 5 degrees with respect to the vertical surface, and the inner pasting plates 19c, 19d, 23c, 23d are thick. Is 4 to 9 mm, and the trapezoidal inner plate 23d for the lower casting frame is formed at a right angle between the upper end surface 23d5 in contact with the match plate 21 and the mold forming surface 23d3 in contact with the casting sand MS. ..

According to this, as shown in FIG. 7, the gap T formed by the lower surface 21d of the match plate 21 and the upper end surface 23d5 of the trapezoidal inner plate 23d for the lower casting frame is the plate thickness t of the inner plate 23d. When the inclination angle θ with respect to the vertical surface of the inner wall surface portion 23b of the lower cast frame trapezoidal shape is set, it can be expressed by the following approximate expression.
2πtθ / 360 = T ... (Equation 1)
It is empirically known that the casting sand MS does not invade if the gap T is 0.5 mm or less. Therefore, when T ≦ 0.5 mm is the condition for the gap T, the thickness t of the trapezoidal inner plate for the lower cast frame 23d and the inclination angle θ of the trapezoidal inner plate 23d for the lower cast frame are , It is desirable to apply under the following conditions.
For example, assuming that a trapezoidal inner wall plate 23d for the lower cast frame with a thickness of 9 mm is used, the inclination angle θ of the inner wall surface portion 23b of the lower cast frame trapezoidal shape with respect to the vertical surface is 3.18 ° from Equation 1. The following is desirable.
For example, assuming that the inclination angle θ of the inner wall surface portion 23b of the lower cast frame trapezoidal shape with respect to the vertical surface is 5 °, it is desirable that the thickness t of the inner wall surface portion 23d of the lower cast frame trapezoidal shape is 5.73 mm or less according to Equation 1.

The inner wall surfaces 19d and 23d of each trapezoidal shape are made by cutting a standard steel plate into a trapezoidal shape corresponding to the shape of the inner wall surface portion 19b of the upper cast frame trapezoidal shape and the shape of the inner wall surface portion 23b of the lower cast frame trapezoidal shape. be.

According to this, for the inner pasting plates 19d and 23d, the standard steel plate is simply cut into a trapezoidal shape according to the shapes of the inner wall surface portion 19b of the upper cast frame trapezoidal shape and the inner wall surface portion 23b of the lower cast frame trapezoidal shape. Can be reduced.

Further, in the corners 19d1, 23d1 in the circumferential direction of the molding space BS (UBS, DBS), only one end face 19d4, 23d4 of the end faces on both sides of each inner sticking plate 19d, 23d is adjacent to the inner sticking plate 19d, It is in contact with the mold forming surfaces 19d3 and 23d3 of 23d.

According to this, even if there is a dimensional error (length and shortness of the inner plate) on the inner plates 19d and 23d, the terminal portion on the opposite side of the one end surface 19d4, 23d4 that has come into contact (mold forming surface 19d3, 23d3). Then, as long as the end faces 19d4 and 23d4 of the inner sticker plates 19d and 23d adjacent to the mold forming surfaces 19d3 and 23d3 of the inner sticker plates 19d and 23d abut from the right angle direction, the gap between the adjacent inner sticker plates 19d and 23d Is gone.
As a result, it is possible to absorb the dimensional error of the inner pasting plates 19d and 23d and easily form the corner portions 19d1, 23d1 having no gap between the adjacent inner pasting plates 19d and 23d.

Further, in each upper casting frame corner portion 19e between the adjacent upper casting frame trapezoidal inner wall surface portions 19b in the upper casting frame 19, trapezoidal inner pasting plate relief grooves 19fd for the upper casting frame are provided along the vertical direction. In the lower casting frame 23, each lower casting frame corner portion 23e between the adjacent lower casting frame trapezoidal inner wall surface portions 23b is provided with an inner pasting plate relief groove 23fd of the lower casting frame trapezoidal shape along the vertical direction. There is.

According to this, even if a dimensional error or an assembly error that is larger than the set dimensions of the inner pasting plates 19d and 23d occurs, the inner pasting plate relief groove 19fd of the trapezoidal shape for the upper casting frame and the trapezoidal shape for the lower casting frame are included. The error can be absorbed by the sticker relief groove 23fd, and the inner sticker plates 19d and 23d can be brought into contact with each other without a gap.

Further, on each upper cast frame rectangular inner wall surface portion 19a, a rectangular plate-shaped inner sticker plate 19c for an upper cast frame having a uniform thickness is detachably attached to each of the lower cast frame rectangles. On the inner wall surface portion 23a, a rectangular inner sticker plate 23c formed in a rectangular plate shape and having a uniform thickness for a lower casting frame is detachably attached to each of them, and is formed by the rectangular inner sticker plates 19c and 23c. In each corner portion 19c1, 23c1 in the circumferential direction of the opening spaces UOS and DOS, adjacent rectangular inner plates 19c and 23c are in contact with each other without a gap.
According to this, the rectangular inner pasting plates 19c and 23c for the upper and lower cast frames are plate materials having a uniform thickness corresponding to the shapes of the rectangular inner wall surface portions 19a and 23a of the upper and lower cast frames. As a result, the inner pasting plates 19c and 23c, which had to be replaced due to wear due to use, can be replaced at a low manufacturing cost without the need for tapering as in the conventional case. Each corner portion 19c1, 23c1 in the circumferential direction of the opening spaces UOS and DOS can be lubricated without the casting sand MS entering the gap between the adjacent inner pasting plates 19c and 23c.

Each of the rectangular inner wall plates 19c and 23c is obtained by cutting a standard steel plate into a rectangular shape corresponding to the shape of the upper cast frame rectangular inner wall surface portion 19a and the shape of the lower cast frame rectangular inner wall surface portion 23a.
According to this, the rectangular inner wall plates 19c and 23c only cut the standard steel plate into a rectangular shape according to the shapes of the upper cast frame rectangular inner wall surface portion 19a and the lower cast frame rectangular inner wall surface portion 23a. The manufacturing cost can be reduced.

At each corner of the opening space OS (UOS, DOS) in the circumferential direction, only one end face 19c4, 23c4 of the end faces on both sides of each rectangular inner sticking plate 19c, 23c is an adjacent rectangular inner sticking plate. It is in contact with the mold forming surfaces 19c3 and 23c3 of 19c and 23c.
According to this, even if a dimensional error (length and shortness of the inner plate) occurs in the inner plates 19c and 23c, the terminal portion (mold forming surface 19c3, 23c3) on the opposite side of the one end surface 19c4, 23c4 that has come into contact with the inner plate has a dimensional error. Then, as long as the end faces 19c4, 23c4 of the inner sticker plates 19c, 23c adjacent to the mold forming surfaces 19c3, 23c3 of the inner sticker plates 19c, 23c abut from the right angle direction, the gap between the adjacent inner sticker plates 19c, 23c. Is gone.
As a result, it is possible to absorb the dimensional error of the inner pasting plates 19c and 23c and easily form the corner portions 19c1, 23c1 having no gap between the adjacent inner pasting plates 19c and 23c.

At the corner portion 19e of the upper casting frame between the adjacent upper casting frame rectangular inner wall surface portions 19a in the upper casting frame 19, a rectangular inner pasting plate relief groove 19fc for the upper casting frame is provided along the vertical direction, and the lower casting is performed. In each of the lower casting frame corners 23e between the adjacent lower casting frame rectangular inner wall surface portions 23a in the frame 23, rectangular inner pasting plate relief grooves 23fc for the lower casting frame are provided along the vertical direction.
According to this, even if a dimensional error or an assembly error that is larger than the set dimensions of the rectangular inner pasting plates 19c and 23c occurs, the rectangular inner pasting plate relief groove 19fc for the upper casting frame and the rectangular for the lower casting frame The error can be absorbed by the shape-shaped inner-paste plate relief groove 23fc, and the adjacent rectangular inner-paste plates 19c and 23c can be brought into contact with each other without a gap.

Further, the upper casting frame 19 is provided with a thin plate-shaped upper casting frame end face plate 19g on the mating surface side to be overlapped with the upper surface 21u (model surface plate for upper mold) of the match plate 21 so as to be removable. 23 g is provided with a thin plate-shaped lower cast frame end face plate 23 g so as to be removable on the mating surface side to be overlapped with the lower surface 21d (model surface plate for lower mold) of the match plate 21.
According to this, the wear generated on the mating surface side of the upper cast frame 19 and the lower cast frame 23 could be prevented by the simple shape upper cast frame end face plate 19 g and the lower cast frame end face plate 23 g, and the wear occurred. In that case, the worn upper cast frame end face plate 19 g or the lower cast frame end face plate 23 g can be replaced to easily return to the state before the wear.

In the above embodiment, the inner mounting plates 19c, 19d, 23c, and 23d are attached with the countersunk bolt 195, but the present invention is not limited to this, and for example, a flat head bolt or a flat head screw member may be used. Further, the inner sticking plate may be attached with a mounting member that can be easily replaced by breaking the rivet itself, such as a rivet.
Further, the rectangular inner wall surface portion 19a of the upper casting frame is attached with the rectangular inner wall surface portion 19c for the upper casting frame, and the trapezoidal inner wall surface portion 19b for the upper casting frame is attached with the inner wall surface portion 19b of the upper casting frame trapezoidal shape. Then, the trapezoidal inner wall surface portion 23b for the lower cast frame is attached with the trapezoidal inner wall surface portion 23d for the lower cast frame, and the rectangular inner wall surface portion 23a for the lower cast frame is attached with the rectangular inner wall surface portion 23a for the lower cast frame. However, it is not limited to this. For example, the trapezoidal inner wall surfaces 19d and 23d may be attached only to the upper cast frame trapezoidal inner wall surface portion 19b and the lower cast frame trapezoidal inner wall surface portion 23b, respectively.

Further, in a molding apparatus that uses compressed air to inject the cast sand MS into the casting frame, as shown in FIG. 20, vent plugs 320 for discharging compressed air into the molding casting frame 319 are provided on the inner pasting plates 319c, 319d. The vent holes 319c2 and 319d2 may be provided in the molding cast frame main body 319m. Even in this case, since the inner pasting plates 319c and 319d are plate materials having a uniform thickness, when the inner pasting plates 319c and 319d are worn, a new inner pasting plate having a low manufacturing cost without any processing effort is required. It can be exchanged for 319c and 319d.
Further, the upper cast frame end face plate 19 g and the lower cast frame end face plate 23 g are each arranged in a square frame shape by combining four strip-shaped thin plates, but the present invention is not limited to this, and for example, an integral square frame shape. It may be a thin plate of.

Further, in the above embodiment, the upper casting frame 19 is superposed on the upper surface 21u of the match plate 21 to form the upper mold MDa, and the lower casting frame 23 is superposed on the lower surface 21d of the match plate 21 to form the lower mold MDb. However, the frameless molding cast frame 1 is not limited to this.
For example, as shown in FIGS. 21 and 22, the lower casting frame 23 and the upper casting frame 19 arranged upside down are arranged side by side on the squeeze table 228 with a lower mold model surface plate 221d (pattern plate). It can also be used for a frameless cast frame that is arranged on the upper mold model surface plate 221u (pattern plate) and squeezes the lower cast frame 23 and the upper cast frame 19 at the same time. In this molding device 222, the shuttle cylinder 86 is configured so that the casting sand feeding device 26 and the squeeze device 24 slide and switch with each other. Two sets of upper and lower casting frames 19, 23 are set on the turntable 230 and are used alternately and repeatedly. The upper casting frame 19 and the lower casting frame 23 are simultaneously squeezed by the squeeze device 24 at positions arranged side by side after the casting sand MS is charged by the casting sand charging device 26. Then, after the model surface plates 221d and 221u are removed, they are transferred by the turntable 230, the lower casting frame 23 is turned upside down in another process, and the upper casting frame 19 is superposed on the inverted lower casting frame 23. Then, the lower casting frame 23 is cut out in a state of being overlapped below the upper casting frame 19, and in each case, a mold in which the upper mold and the lower mold of the drawing are overlapped is completed.

The following matters will be disclosed.
(1)
To form an upper casting frame that is formed in a square cylinder shape and stacked on an upper mold model surface plate to form an upper mold, and to form a lower mold that is formed in a square cylinder shape and stacked on a lower mold model surface plate. It is a frameless molding casting frame equipped with a lower casting frame.
The upper casting frame is continuously provided on four upper casting frame rectangular inner wall surface portions for forming a rectangular parallelepiped opening space with a predetermined width from the upper end of the upper casting frame, and the upper casting frame rectangular inner wall surface portion. It is equipped with four upper cast frame trapezoidal inner wall surfaces for forming a quadrangular pyramid trapezoidal molding space that expands downward.
The lower casting frame has four lower casting frames for forming a quadrangular pyramid-shaped molding space that expands downward from the upper end of the lower casting frame in a state of being overlapped below the upper casting frame. It is provided with an inner wall surface portion of the shape and four rectangular inner wall surface portions of the lower cast frame for forming a rectangular parallelepiped opening space continuous with the inner wall surface portion of the lower cast frame trapezoidal shape to the lower end of the lower cast frame.
On the inner wall surface of each trapezoidal upper cast frame, trapezoidal inner wall plates for upper cast frames formed in a trapezoidal shape and having a uniform thickness are detachably attached to each other.
A trapezoidal inner wall surface for a lower cast frame, which is formed in a trapezoidal shape and has a uniform thickness, is detachably attached to the inner wall surface of each lower cast frame trapezoid.
The inner wall surface of each trapezoidal shape is obtained by cutting a standard steel plate into a trapezoidal shape corresponding to the shape of the inner wall surface portion of the upper cast frame trapezoidal shape and the shape of the inner wall surface portion of the lower cast frame trapezoidal shape.
Each corner in the circumferential direction of the molding space formed by the trapezoidal inner plate for the upper and lower casting frames is a frameless molding in which the adjacent inner plates are in contact with each other without a gap. Casting frame.
(2)
The inclination angle of the inner wall surface portion of the upper cast frame base shape and the inner wall surface portion of the lower cast frame base shape is 3 to 5 degrees with respect to the vertical plane.
Each of the inner sticker plates has a thickness of 4 to 9 mm and has a thickness of 4 to 9 mm.
The trapezoidal inner plate for the lower casting frame is formed at a right angle between the end surface in contact with the model platen for the lower mold and the mold forming surface in contact with the casting sand. Frame type casting frame.
(3)
At each corner of the molding space in the circumferential direction, only one of the end faces on both sides of the trapezoidal inner plate is in contact with the mold forming surface of the adjacent trapezoidal inner plate. The frameless molding cast frame according to (1) or (2).
(4)
At the corner of the upper casting frame between the inner wall surfaces of the upper casting frame trapezoidal shape adjacent to each other in the upper casting frame, a trapezoidal inner sticking plate relief groove for the upper casting frame is provided along the vertical direction.
At each corner of the lower casting frame between the inner wall surfaces of the lower casting frame trapezoidal shape adjacent to each other in the lower casting frame, a trapezoidal inner sticking plate relief groove for the lower casting frame is provided along the vertical direction (3). Frameless molding cast frame described in.
(5)
A rectangular inner wall surface for the upper cast frame, which is formed in the shape of a rectangular plate and has a uniform thickness, is detachably attached to each of the upper cast frame rectangular inner wall surfaces.
A rectangular inner wall surface for the lower cast frame, which is formed in the shape of a rectangular plate and has a uniform thickness, is detachably attached to the rectangular inner wall surface of each lower cast frame.
At each corner of the opening space formed by the rectangular plate-shaped inner lining plate in the circumferential direction, the adjacent rectangular plate-shaped lining plates are in contact with each other without a gap (1) to The frameless molding cast frame according to any one of (4).
(6)
Each of the rectangular inner wall plates is obtained by cutting a standard steel plate into a rectangular shape corresponding to the shape of the upper cast frame rectangular inner wall surface portion and the shape of the lower cast frame rectangular inner wall surface portion (5). Frameless molding cast frame described in.
(7)
At each corner of the opening space in the circumferential direction, only one of the end faces on both sides of the rectangular inner sticker is in contact with the mold forming surface of the adjacent rectangular inner sticker. The frameless molding cast frame according to (5) or (6).
(8)
At the corner of the upper casting frame between the rectangular inner wall surfaces of the upper casting frame adjacent to each other in the upper casting frame, a rectangular inner pasting plate relief groove for the upper casting frame is provided along the vertical direction.
In the lower casting frame, rectangular inner pasting plate relief grooves for the lower casting frame are provided along the vertical direction at each corner of the lower casting frame between the adjacent lower casting frame rectangular inner wall surfaces (7). Frameless molding cast frame described in.
(9)
The upper casting frame is provided with a thin plate-shaped upper casting frame end face plate on the mating surface side to be overlapped with the upper mold model surface plate so as to be removable.
Item 1 of (1) to (8), wherein the lower cast frame is provided with a thin plate-shaped lower cast frame end face plate on the mating surface side to be overlapped with the lower mold model surface plate so as to be removable. Frameless molding cast frame described in.

1 ... Frameless casting frame, 2 ... Molding device, 4 ... Base, 19 ... Upper casting frame, 19a ... Upper casting frame rectangular inner wall surface, 19b ... Upper casting frame trapezoidal inner wall surface, 19c ... Upper casting Rectangular inner pasting plate for frame, 19c1 ... corner, 19c3 ... mold forming surface, 19c4 ... end face, 19d ... trapezoidal inner pasting plate for upper casting frame, 19d1 ... corner, 19d3 ... mold forming surface, 19d4 ... End face, 19e ... Upper casting frame corner, 19fc ... Rectangular inner pasting plate relief groove for upper casting frame, 19fd ... Trapezoidal inner pasting plate relief groove for upper casting frame, 19g ... Upper casting frame end face plate, 191 ... 1st upper casting frame, 192 ... 2nd upper casting frame, 20 ... laminated casting frame, 21d ... lower surface of match plate (lower mold model platen), 21u ... upper surface of match plate (upper mold model plateau), 22 ... Reversing device, 221d ... Lower mold model platen, 221u ... Upper mold model platen, 23 ... Lower casting frame, 23a ... Lower casting frame rectangular inner wall surface, 23b ... Lower casting frame trapezoidal inner wall surface, 23c ... Rectangular inner pasting plate for lower casting frame, 23c1 ... Corner, 23c3 ... Mold forming surface, 23c4 ... End surface, 23d ... Trapezoidal inner pasting plate for lower casting frame, 23d1 ... Corner, 23d3 ... Mold forming surface , 23d4 ... end face, 23e ... lower casting frame corner, 23fc ... rectangular inner pasting plate relief groove for lower casting frame, 23fd ... trapezoidal inner pasting plate relief groove for lower casting frame, 23g ... lower casting frame end face plate , 231 ... First lower casting frame, 232 ... Second lower casting frame, 26 ... Casting sand input device, 28 ... Casting frame lateral movement device, 32 ... Rotating device (rotating shaft), Ma ... Upper mold model, Mb ... Lower mold model, MD ... Mold, MDa ... Upper mold, MDb ... Lower mold, MS ... Casting sand, mst ... Molding station, fst ... Frame set / die cutting station, tst ... Frame alignment / frame cutting station, BS (UBS / DBS) ... Molding space, OS (UOS / DOS) ... Opening space.

Claims (9)

To form an upper casting frame that is formed in a square cylinder shape and stacked on an upper mold model surface plate to form an upper mold, and to form a lower mold that is formed in a square cylinder shape and stacked on a lower mold model surface plate. It is a frameless molding casting frame equipped with a lower casting frame.
The upper casting frame is continuously provided on four upper casting frame rectangular inner wall surface portions for forming a rectangular parallelepiped opening space with a predetermined width from the upper end of the upper casting frame, and the upper casting frame rectangular inner wall surface portion. It is equipped with four upper cast frame trapezoidal inner wall surfaces for forming a quadrangular pyramid trapezoidal molding space that expands downward.
The lower casting frame has four lower casting frames for forming a quadrangular pyramid-shaped molding space that expands downward from the upper end of the lower casting frame in a state of being overlapped below the upper casting frame. It is provided with an inner wall surface portion of the shape and four rectangular inner wall surface portions of the lower cast frame for forming a rectangular parallelepiped opening space continuous with the inner wall surface portion of the lower cast frame trapezoidal shape to the lower end of the lower cast frame.
On the inner wall surface of each trapezoidal upper cast frame, trapezoidal inner wall plates for upper cast frames formed in a trapezoidal shape and having a uniform thickness are detachably attached to each other.
A trapezoidal inner wall surface for a lower cast frame, which is formed in a trapezoidal shape and has a uniform thickness, is detachably attached to the inner wall surface of each lower cast frame trapezoid.
For the inner wall surface of each trapezoidal shape, the steel plate (excluding the cured one) was cut into a trapezoidal shape corresponding to the shape of the inner wall surface portion of the upper cast frame trapezoidal shape and the shape of the inner wall surface portion of the lower cast frame trapezoidal shape. It is a thing
Each corner in the circumferential direction of the molding space formed by the trapezoidal inner plate for the upper and lower casting frames is a frameless molding in which the adjacent inner plates are in contact with each other without a gap. Casting frame. The upper mold and the lower mold are extracted from the rectangular parallelepiped opening space side formed by the four rectangular inner wall surfaces of the lower cast frame by superimposing the upper mold and the lower mold to be combined at the time of pouring. The frameless molding cast frame according to claim 1, wherein the vertical width of the rectangular inner wall surface portion of the lower cast frame is smaller than the vertical width of the inner wall surface portion of the lower cast frame trapezoidal shape. A rectangular inner wall surface for the upper cast frame, which is formed in the shape of a rectangular plate and has a uniform thickness, is detachably attached to each of the upper cast frame rectangular inner wall surfaces.
A rectangular inner wall surface for the lower cast frame, which is formed in the shape of a rectangular plate and has a uniform thickness, is detachably attached to the rectangular inner wall surface of each lower cast frame.
At each corner in the circumferential direction of the opening space formed by the rectangular inner lining plate for the upper casting frame, the adjacent rectangular inner lining plates for the upper casting frame are in contact with each other without any gap. Contact ,
At each corner in the circumferential direction of the opening space formed by the rectangular inner lining plate for the lower casting frame, the adjacent rectangular inner lining plates for the lower casting frame are in contact with each other without a gap. The frameless molding cast frame according to claim 1 or 2. Each of the rectangular inner wall plates is formed by cutting a steel plate (excluding hardened ones) into a rectangular shape corresponding to the shape of the upper cast frame rectangular inner wall surface portion and the shape of the lower cast frame rectangular inner wall surface portion. The frameless molding cast frame according to claim 3. At each corner of the opening space in the circumferential direction, only one of the end faces on both sides of the rectangular inner sticker is in contact with the mold forming surface of the adjacent rectangular inner sticker. The frameless molding cast frame according to claim 3 or 4. At the corner of the upper casting frame between the rectangular inner wall surfaces of the upper casting frame adjacent to each other in the upper casting frame, a rectangular inner pasting plate relief groove for the upper casting frame is provided along the vertical direction.
5. Claim 5 in which a rectangular inner pasting plate relief groove for a lower casting frame is provided along the vertical direction at each corner of the lower casting frame between adjacent lower casting frame rectangular inner wall surfaces in the lower casting frame. Frameless molding cast frame described in. The upper casting frame is provided with a thin plate-shaped upper casting frame end face plate on the mating surface side to be overlapped with the upper mold model surface plate so as to be removable.
One of claims 1 to 6, wherein a thin plate-shaped lower cast frame end face plate is provided on the lower cast frame on the mating surface side to be overlapped with the lower mold model surface plate so as to be removable. Frameless molding cast frame described in. The trapezoidal inner plate for the upper cast frame is attached to the inner wall surface of the trapezoidal shape of the upper cast frame by a fastening member penetrating from the surface of the trapezoidal inner plate for the upper cast frame to the outer peripheral surface of the upper cast frame. The frameless molding cast frame according to any one of claims 1 to 7, which is worn. The trapezoidal inner wall plate for the lower cast frame is attached to the inner wall surface of the trapezoidal shape of the lower cast frame by a fastening member penetrating from the surface of the trapezoidal inner plate for the lower cast frame to the outer peripheral surface of the lower cast frame. The frameless molding cast frame according to any one of claims 1 to 8, which is worn.

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