JP2018058102A - Parting part covering body of frameless mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parting part covering body of a frameless mold, in the production of a cast article by a vertical type line applying a cast article production method where, for filling a molten metal into a desired cavity part as a part of the cavity of a gas permeable mold, a molten metal with a volume smaller than the volume of the whole cavity of the gas permeable mold and almost equal to that of the desired cavity part is gravity-poured, before the injected molten metal is filled into the desired cavity part, a gas is fed from a sprue part, and the molten metal is filled into the desired cavity part so as to be solidified, capable of preventing the leakage of the gas from the parting part and suppressing the underfill of the product and the defect of a run.SOLUTION: Provided is a parting part covering body of a frameless mold, in a vertical parting frameless mold, composed in such a manner that any one or more parting parts of in at least the upper side of an upper face parting part exposed to the upper face and side face parting parts exposed to the side faces are covered.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a parting part covering for a frameless mold.

  Since a desired cavity portion, which is a part of the cavity of the air-permeable mold, is filled with the molten metal, the volume of the desired cavity is smaller than the entire volume of the cavity of the air-permeable mold (hereinafter sometimes referred to as a mold cavity). The molten metal of approximately the same volume as the part is gravity poured, and before the poured molten metal is filled into the desired cavity part, gas (compressed gas) is sent from the pouring part to melt the molten metal into the desired cavity part. Patent Document 1 and Patent Document 2 disclose a method for producing a cast article that is filled and solidified (hereinafter, sometimes referred to as air supply pressure casting). In particular, Patent Document 2 discloses a mode in which this air-feeding pressure casting method is applied to a vertical partless frameless mold.

JP 2007-75862 A JP 2010-269345 A

  However, the present inventor has found that the following problems arise when the above-described air-feeding pressure casting method is applied to a casting line using a vertical partless frameless mold (hereinafter also referred to as a vertical line).

  FIGS. 7A and 7B are diagrams for explaining one embodiment of a vertical line to which the present invention is applied. The X, Y, and Z arrows in the figure are used to describe the direction, and all of the arrows have a positive (+) direction (see FIGS. 1 to 6 and The same applies to FIG. 8). FIG. 7A is a perspective view of a vertical line. An unframed mold (hereinafter also referred to as a mold) is formed by a molding machine (not shown) on the X (−) side and placed on the walking beam 2. Are sequentially sent out in the direction of X (+) and matched. Now, a description will be given of the mold 1 in which the front mold 1a previously molded and the rear mold 1b that has been molded and then sent out are matched. The mold matching portion of the mold 1 is a parting part that is exposed to the outside. 3. The parting part 3 includes an upper part part 31 exposed on the upper surface side of the mold 1, that is, the Z (+) side, two side surfaces of the mold 1, that is, the Y (-) side, and a Y (+) side (not shown). The side parting part 32 exposed to is provided. The mold 1 has a cavity (not shown) between the front mold 1a and the rear mold 1b, and further has a gate 4 on the upper surface part 31 for supplying a molten metal to the cavity.

  By the way, in the vertical type line, there is a case where molding is performed so as to provide a gap of about 0.5 mm at the maximum above the side parting part 32 (Z (+) side). .) FIG. 7B is a side view of a vertical line for explaining this. In this example, the rear surface 6 (X (−) side surface) of the front mold 1a is perpendicular to the walking beam 2 (parallel to the Z direction), and the rear for forming the front mold 1a and the parting portion 3 is formed. The front surface 7 (X (+) side surface) of the mold 1b is formed so as to incline backward (X (−) side) toward the upper side (Z (+) side) with respect to the walking beam 2. . That is, the side parting part 32 has a gap 5 that widens in the direction of Z (+) from below (walking beam 2 side) (the upper parting part 31 also has a corresponding gap). By molding in this way, when the mold 1b is pressed against the front mold 1a, the force pressing the rear mold 1b against the front mold 1a is biased downward (Z (−) side) of the mold matching portion. The effect of preventing the leakage of molten metal from the lower portion 32B (hereinafter, also referred to as “hot water leakage”) in the side parting portion 32 is obtained.

However, if air-feeding and pressure casting is performed on such a vertical line that takes a form for preventing leakage of hot water, the following problems may occur. FIG. 8 is a diagram showing a problem in the case of applying air supply and pressure casting to a vertical line. In the air-feeding pressure casting, after the molten metal is poured into the mold, the gas-feeding member 8 is attached to the gate 4 and the gas G is supplied into the cavity of the mold 1, but above the parting portion 4 as described above. In the case of a vertical line in which a gap is provided, a part of the gas leaks as gas _GL from the upper part 32T or the upper part 32T of the side parting part 32, or both of them. The gas pressure necessary to push the molten metal into the part will be insufficient. For this reason, it becomes a subject that it becomes easy to produce a lack of meat and a hot water defect in a product.

  An object of the present invention is to prevent the leakage of gas from a parting part and the suppression of a lack of product and a lack of hot water in the manufacture of a cast article using a vertical line to which air supply pressure casting is applied. An object of the present invention is to provide a parting part covering for a frame mold.

  That is, the present invention is configured such that, in a vertical partless frameless mold, at least one parting part of at least the upper part of the upper part part exposed on the upper surface or the side part part exposed on the side surface can be covered. It is a parting part covering of a frameless mold.

  Another embodiment of the present invention is a partless part covering body for a frameless mold that is integrally provided with an air supply part that is configured to be connected to a gate of the frameless mold and to supply gas to the cavity.

  Moreover, it is preferable that the parting part covering body of the present invention includes a seal member at a part covering the parting part.

  By applying the present invention to a casting article manufacturing method using a vertical line by an air-feeding pressure casting method, gas leakage from the parting portion is prevented, and sufficient gas pressure is provided to push the molten metal into a desired cavity portion. It is possible to secure the product, and it is possible to suppress the lack of product and the lack of hot water.

It is a figure explaining Embodiment 1 of this invention. It is explanatory drawing which applies Embodiment 1 of this invention to the air supply pressure casting of a vertical line. It is a figure explaining Embodiment 2 of this invention, Comprising: (a) is a perspective view, (b) is sectional drawing of the A-A 'site | part shown to (a). It is a figure explaining Embodiment 3 of this invention, (a) is a perspective view, (b) is an enlarged view of the area | region B in the cross section of the A-A 'site | part shown to (a). It is a figure explaining Embodiment 4 of this invention. It is a figure explaining Embodiment 5 of this invention. It is a figure explaining the form of the casting_mold | template by the vertical type | mold with a suitable application of this invention, (a) is a perspective view, (b) is a side view. It is a figure explaining the subject which the present invention tends to solve.

  The present invention is a parting part covering body (hereinafter, also referred to as parting part covering body) configured to be able to cover a parting part exposed on the upper surface of the frameless mold and at least an upper part of the parting part exposed on the side surface. is there. Hereinafter, embodiments illustrating specific configurations of the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments.

(Embodiment 1)
FIG. 1 is a diagram showing an example in which the present invention is applied to a vertical line. The parting part covering body 10 of the present invention covers the horizontal part 10a for covering the top parting part 31 exposed on the upper surface of the mold 1 and at least the upper side (Z (+) side) of the side parting part 32 exposed on the side surface. Although an example having both of the vertical portions 10b is shown, any one of the horizontal portion 10a and the vertical portion 10b may be used.

  A method of covering the upper surface part 31 and the side part 32 of the mold 1 with the parting part covering 10 in the first embodiment will be described. The top part 31 is placed so as to cover the horizontal part 10a by an arbitrary method. In order to prevent the horizontal portion 10a from being separated from the upper surface parting part 31, it is preferable to press the horizontal part 10a against the upper surface parting part 31 in the Z (−) direction by a pressing means (not shown). As the pressing means, a known means, for example, a weight having a necessary weight or an arm using a pneumatic cylinder can be used. The side parting part 32 may be covered with the vertical part 10b by an arbitrary method, but in order to prevent the vertical part 10b from dropping or being separated from the side parting part 32, a pressing means (not shown) is used in the Y direction. The vertical portion 10b is preferably pressed against the side parting portion 32. As the pressing means, known means, for example, an arm using a pneumatic cylinder can be used.

  The vertical portion 10b may have a structure that covers all of the side parting part 32 exposed on the side surface of the mold 1, but preferably has a structure that covers only the upper half of the side parting part 32, that is, the upper side. In FIG. 7B described above, the gap 5 that is intentionally provided to prevent the leakage of hot water is provided so as to widen toward the upper side (Z (+) side) of the mold 1. By covering the upper side 32T, the leakage of the air supply gas can be sufficiently suppressed. Further, since the side of the vertical line (Y direction) is generally equipped with ancillary equipment, it is advantageous that the vertical portion 10b is as small as possible in order to avoid interference with the pressing means of the vertical portion 10b as much as possible. .

  In FIG. 1, the width Wa of the horizontal portion 10 a and the width Wb of the vertical portion 10 b may be arbitrary as long as gas leakage from the parting portion 3 can be suppressed. However, if these widths are too small, there is a possibility that the parting part 3 may not be sufficiently covered when the parting part covering body 10 is set in the mold. For this reason, the width Wa and the width Wb are preferably 5 mm or more, and more preferably 10 mm or more.

  FIG. 2 is a diagram in which air supply pressure casting is applied in the first embodiment. An air supply member 8 covers the gate 5 (not shown) and is connected to the mold 1 to supply the gas G to the cavity of the mold 1. At this time, the upper part of the upper part 31 (not shown) and the upper part of the side part 32 are covered with the parting part covering body 10 of the present invention, so that gas leakage from the parting part 3 is suppressed.

(Embodiment 2)
FIGS. 3A and 3B are diagrams for explaining the second embodiment of the present invention. The parting part covering body 110 shown in the second embodiment is shown in the same form as in the first embodiment except that the part covering the parting part 3 has the seal member 111. FIG. 3A is a perspective view, and FIG. 3B is a cross-sectional view of a portion (parting portion 3 of the mold 1) indicated by AA ′ in FIG. The parting part covering body 110 has a form having a seal member 111 on the side covering the parting part 3 (that is, the mold 1 side). By setting it as such a structure, the leak of the gas from the parting part 3 can be suppressed more effectively. The seal member 111 may be made of a known flexible material such as urethane, silicone, or acrylic, or a heat-resistant material such as graphite ceramic. Note that only one of the horizontal portion 110a and the vertical portion 110b may be included in the seal member 111. The second embodiment can also be applied to other embodiments described below.

  FIG. 4 is a diagram for explaining the third embodiment of the present invention. In the parting part covering body 210 of the third embodiment, the horizontal part 210a and the vertical part 210b are integrally connected to each other via a connecting part 210d, and further, via a connecting part 210c configured not to interfere with the gate 4. The first embodiment is the same as the first embodiment except that the Y (−) side and the Y (+) side are integrally connected. Since the horizontal part 210a and the vertical part 210b which cover the parting part 3 are united, Embodiment 3 is preferable since management is easy. The connecting portion 210d may be configured to be detachable from the horizontal portion 210a, and the connecting portion 210c may be configured to be detachable from the vertical portion 210b. Further, in FIG. 4, the connecting portion 210 c is shown in a ring shape surrounding the gate 4, but is not particularly limited to this shape.

  The third embodiment in which the horizontal portion 210a and the vertical portion 210b are integrally formed is preferable because it can be set in one operation of fitting in the mold 1 in the Z (−) direction toward the parting portion 3. . Also in this embodiment, it is preferable that the vertical part 210b has a length sufficient to cover only the upper side of the side parting part 32. That is, since the stroke in the fitting operation described above is short with respect to the form covering up to the side parting portion 32B on the lower side, the increase in line tact is suppressed.

(Embodiment 4)
5 (a) and 5 (b) are diagrams for explaining a fourth embodiment of the present invention. The fourth embodiment is the same as the third embodiment except that the lower surface (Z (−) side end) of the vertical portion 310 b is configured such that the surface 310 e on the mold 1 side is separated from the mold 1. Show. 5A is a perspective view, and FIG. 5B is a cross-sectional view of a portion indicated by AA ′ in the region indicated by B in FIG. 5A. As shown in FIG. 5B, the mold side surface 310e at the lower end of the vertical portion 310b is curved so as to protrude downward from the mold 1 and project away from the mold 1 toward the lower side (Z (−) side). Is. By adopting such a configuration, when the parting portion covering 310 is fitted from the upper side to the lower side (Z (−) side) of the mold 1 and attached, the positioning in the Y direction is particularly easy to perform and the setting is performed quickly. It is preferable because it is possible. The fourth embodiment can be applied to the above-described second embodiment and other embodiments described below.

(Embodiment 5)
FIG. 6 is a diagram for explaining a fifth embodiment of the present invention. In FIG. 6, Embodiment 5 is an embodiment except that it is integrally provided with an air supply portion 410 c configured to be connected to a gate (not shown) of the mold 1 and to supply a gas G to the cavity of the mold 1. 3 in the same form. The air supply part 410c also serves as a connecting part that connects the Y (+) side and the Y (-) side horizontal part 410a.

  The parting part covering body 410 is integrally provided with an air supply part 410c, and may be used in a form integrally attached to a gas supply unit (not shown) via the air supply part 410c. The parting part covering body 410 is attached so as to be fitted into the mold 1 after the molten metal is supplied to the mold 1 from the gate (not shown), and the gas G supplied from the gas supply means (not shown) passes through the air supply part 410c. And supplied to the cavity of the mold 1 from the gate. In the case of a form integrally attached to a gas supply means (not shown), it is not necessary to prepare a plurality of parting-part covering bodies, and the step of removing the parting-part covering bodies when the mold after casting is separated. Is preferable because it becomes unnecessary.

DESCRIPTION OF SYMBOLS 1 Mold 1a Front mold 1b Back mold 2 Walking beam 3 Parting part 4 Gate 5 Crevice 6 Front mold rear surface 7 Rear mold front side 8 Air supply member 10 (110, 210, 310, 410) Unframed parting part Cover 10a (110a, 210a, 310a, 410a) Horizontal portion 10b (110b, 210b, 310b, 410b) Vertical portion 31 Upper surface part 32 Side surface part 32B Lower side part 32T Upper side part 111 Side seal 111 Member 210c Connecting part 210d Connecting part 310e Mold side surface 410c at the lower end of the vertical part

Claims (3)

  The vertical partingless frameless mold is configured to cover at least one parting part of at least the upper part of the upper parting part exposed on the upper surface or the side parting part exposed on the side surface. , A parting part covering of a frameless mold.   The parting part covering body of the frameless mold according to claim 1, which is integrally provided with an air supply unit configured to be connected to the gate of the frameless mold and to supply gas to the cavity of the frameless mold.   The parting part covering body of the frameless mold according to claim 1 or 2, wherein the parting part covering body includes a seal member at a portion covering the parting part.

Images