JP4790515B2 - William score forming parts and mold production model - Google Patents

Description

  The present invention relates to a William score forming part and a mold manufacturing model, and more particularly to a technique for forming a William score on a mold and a technique for manufacturing a cast product of good quality.

The “mold” is a mold having a void from which molten metal (molten metal / alloy) is poured and solidified to obtain a required structure (casting). As the types of molds, sand molds, metal molds, gypsum molds, cement molds, shell mold molds, and the like are known, but sand molds and shell mold molds are generally used for castings targeted in the present application.
FIG. 4 schematically shows a cross-sectional view of the mold 51. In the mold 51 shown in the figure, in addition to a gap 52 (mold gap 52) for casting a casting body, a pouring gate, a runner (pouring gate 53) serving as a passage for a molten metal, a feeder 54 for compensating for solidification shrinkage, The William score 55 for increasing the effect of the hot water, the frying that removes dirt and the like, and the gap for degassing are formed. Note that the upper mold and the lower mold are usually manufactured separately from each other, and the mold 51 is used by superposing them (in FIG. 4, the joint is indicated by a dotted line).

  Among these, “push-up” is generally a void other than “a void for casting a casting body”, and is a void for supplying an amount of molten metal that compensates for volume shrinkage. Molten metal generally shrinks in volume during cooling and solidification. Therefore, as for the molten metal, the molten metal surface falls with the temperature fall after pouring. Then, during the cooling of the molten metal, a dent (shrinkage) may occur there, and a cavity (shrinkage cavity) may also occur inside the casting. A hot water is provided to prevent this. Since the feeder 54 shown in FIG. 4 is provided in the mold 51 and does not come into direct contact with the atmosphere (mekura feeder), the cooling rate is relatively slow, compared to a feeder (open feeder) that is open to the atmosphere. There is a feature that the hot water effect can be obtained with a small amount. The metal / alloy solidified in the feeder part is integrated with the casting after mold release, but it is not a product, so it is eventually cut off.

  Further, the “William score” is a thin conical protrusion formed on the mold wall surface that forms a mekura hot water like the hot water 54. The reason for forming the William score is that the heat of the molten metal collects in the thin conical protrusions, so that the solidification of the molten metal around it can be delayed and the effect of providing the hot metal can be increased (molten metal) If the solidification of the metal is delayed, the metal remains in a molten state, and the pressure during casting can be applied to that portion). Therefore, it is important to form a William score on the mold on which the Mekura hot water is formed, and many applications relating to this have been made (Patent Document 1, etc.).

As shown in FIG. 5, generally, the manufacturing method of the casting_mold | template 51 and a casting is as follows.
(1) Manufacture of mold manufacturing model 61 As shown in FIG. 5A, a mold manufacturing model 61 having the same shape as a casting, specifically, a casting gap as a “portion for casting a casting body”. A forming part 62, a gate system, a hot water forming part 63 as "a part for forming a hot water", a William score forming part 64 as "a part for forming a William core", and a blow hole 65 are provided. The provided “hollow mold manufacturing model 61 having the same shape as the casting” is manufactured. Note that, in the mold manufacturing action model 61, the upper mold and the lower mold are usually manufactured separately as indicated by the dividing line D.
(2) Manufacture of Cast Frame 67 As shown in FIG. 5B, a frame 67 (cast frame 67) having an appropriate size to be put on the mold manufacturing model 61 is manufactured. Note that the casting frame 67 is usually manufactured separately for the upper mold and the lower mold as indicated by the dividing line D. In addition, holes for allowing air to escape when the mold sand is filled are formed in the casting frame 67, but this figure is omitted here.
(3) Filling of mold sand As shown in FIG. 3C, the mold sand (mold material) is filled between the mold manufacturing model 61 and the casting frame 67 (see the dotted line arrow). Note that the filling of the mold sand is usually performed separately for the upper mold and the lower mold as indicated by the dividing line D.
(4) Curing of mold sand As shown in FIG. 4D, the filled mold sand is cured (the cured mold sand becomes the mold 51). Then, the mold making model 61 and the casting frame 67 are removed, and the upper die and the lower die are joined (in the figure, a joint is shown by a dotted line).
(5) Reduced pressure casting As shown in FIG. 5E, when a molten metal is cast into the mold gap 52 of the mold 51, a casting is completed. The figure shows an example in which casting is performed by a reduced pressure casting method.

As shown in FIG. 1A, the conventional mold making action model 61 includes a casting void forming part 62, a feeder formation part 63, and a William score forming part 64, which are integrally manufactured. Therefore, they are continuously connected (however, they are divided into an upper mold and a lower mold on the dividing surface D).
When filling the mold sand using such a mold making model 61 (above (3)), the resin-coated sand is blown by the cold box molding method (core, blow) to remove the mold making model 61 from the outside. Adhere to the surface. Therefore, the mold sand is deposited on the William score forming unit 64 to form the William score 55. At this time, the air passes through the blow hole 65 formed in the William score forming portion 64, and the mold sand passes through the hole (not shown) of the casting frame 67 without passing through the blow hole 65. However, since the mold sand is coated with resin, the resin may soak into the blow hole 65 and the mold sand may be clogged. If the mold production model 61 and the casting frame 67 are removed while the mold sand is still clogged, a shape defect will occur in the William score 55 of the completed mold 51.

JP 54-160517 A

  However, since the conventional mold-making action model 61 is an integral type in which the William score forming portion 64 is directly carved in the hot water forming portion 63, only the William score forming portion 64 is replaced when the blow hole 65 is clogged. There was a problem that I could not. Therefore, if the blow hole 65 is damaged due to the clogging of the blow hole 65, it is difficult to repair and correct only the damaged part of the mold manufacturing model 61, and it is necessary to request a contractor to remanufacture the model set. There was a problem that it took time.

  Further, when a defective shape is generated in the William score forming portion 64 of the mold manufacturing model 61 and the portion has an irregular shape, the mold 51 is manufactured, and casting is performed using the mold 51. Even if 54 is provided, there is a problem that shrinkage cavities occur in the casting body. Furthermore, when a shape defect occurs in the William score forming part 64 of the mold manufacturing model 61, it is necessary to stop the production there and to change the production line depending on the situation, which adversely affects the production line. There was a problem of giving.

  The present invention has been made in view of the above circumstances, and the purpose thereof is a William score forming part and a mold manufacturing model capable of replacing the “part for forming a William score” of a mold manufacturing model. The purpose is to provide.

In order to solve the above problems, the William score forming component according to the present invention is:
A William score forming part for forming a William score on a mold,
A recess shaped like the shape of the William score;
An air vent bend hole formed at the tip of the recess;
A fixing means formed on the outer surface of the William score forming component and for removably fixing to the mold manufacturing model,
The gist is that
In this case, the fixing means may be a screw thread.
In this case, it is desirable to provide a groove used for attaching and removing the William score forming component.

In order to solve the above problems, the mold production model according to the present invention is:
A part for casting the casting body;
A mold production model with a part for forming a mekura hot water,
The gist is that an embedding hole for embedding the William score forming component described above is formed.
In this case, it is desirable to cut a thread on the inner peripheral surface of the buried hole.

The William score forming part according to the present invention is a fixing means formed on the outer peripheral surface of the William score forming part, and is provided with a fixing means for detachably fixing to the mold manufacturing model. It can be detachably fixed. Therefore, the William score forming part can be replaced.
In addition, since the William score forming part is provided with a groove used for attaching and detaching it, it is attached to and removed from the mold manufacturing model by inserting a jig such as a screwdriver into the groove and turning it. be able to. Therefore, the William score forming part can be replaced.
Since the mold manufacturing model according to the present invention is formed with a buried hole for fixing the William score forming part, the William score forming part is buried in the buried hole or removed from the buried hole. Can be. Therefore, the mold manufacturing model according to the present invention can be used by replacing the William score forming part.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1: shows the top view, AA sectional view, and bottom view of the William score formation component 1 which concerns on one Embodiment of this invention. The William score forming component 1 includes a recess 2, a bend hole 3, and a fixing means 4. The concave portion 2 has a shape of a William score 5 (see FIG. 3D) formed in the mold 15 (see FIG. 3D). Since the shape of the William score 5 is determined by the shape of the recess 2, the shape of the recess 2 is important, but it is not particularly limited. As long as it becomes thinner at the tip, it is sufficient.

  The bend hole 3 is a plurality of substantially rectangular slit-shaped holes, and is an air vent hole formed in the tip portion of the recess 2. The bend hole 3 is a through-hole that communicates with the recess 2, and with the William score forming component 1 fixed to the mold manufacturing model 6 (see FIG. 3A), the outside air and the mold manufacturing model 6 It is a hole which penetrates. The bend hole 3 is a hole that serves as a passage for air when the cold box molding method (core, blow) is performed when the mold production model 6 is manufactured, but the mold sand does not pass therethrough. The bend hole 3 is not particularly limited in size and shape as long as such a condition is satisfied. Therefore, the shape of the slit is not limited, and the hole may be a plurality of round holes, elliptical holes, square holes, and polygonal holes.

  The fixing means 4 is formed on the outer peripheral surface 7 of the William score forming component 1, and is for detachably fixing the William score forming component 1 to the mold manufacturing model 6. The fixing means 4 is, for example, a screw thread (male screw) carved on the outer peripheral surface 7 although not specifically shown. In addition, the position which cuts a screw thread is not specifically limited, Other positions, such as outer peripheral surface 7 ', may be sufficient. Further, a predetermined protrusion may be provided instead of the screw thread, and this may be used as the fixing means 4.

  The groove 8 is a part used for attaching / detaching the William score forming part 1 to / from the casting model 6. The grooves 8 are two grooves formed on the top end face of the William score forming component 1. These grooves are formed in a positional relationship of exactly 180 ° around the longitudinal axis of the William score forming component 1, but are not limited to this position. It is only necessary to attach or remove the William score forming component 1 by inserting a screwdriver or the like into the groove 8 and rotating it together with the William score forming component 1, and the shape, number and position of the groove 8 are not limited. Therefore, instead of the grooves 8, convex portions or uneven portions may be formed, and the number thereof may be one or three or more.

  The William score forming component 1 is roughly divided into a brass main body 9 that is easy to process and a bend hole portion 10 made of stainless steel that has high wear resistance. The concave portion 2 described above is formed across the two by cutting the bend hole portion 10 in the state in which the bend hole portion 10 is press-fitted into the main body 9, and a portion other than the tip portion of the concave portion 2 is formed in the main body 9. The tip portion of the recess 2 is formed in the bend hole portion 10. The plurality of slit-like bend holes 3 are formed in the bend hole portion 10, and the fixing means 4 and the groove 8 are formed in the main body 9. The material and shape of the main body 9 and the bend hole portion 10 are not particularly limited. Further, the main body 9 and the bend hole portion 10 are not limited to being manufactured separately from different materials, and may be manufactured integrally from the same material.

With reference to FIG. 2, the manufacturing method of the component 1 for William score formation which concerns on one Embodiment of this invention is demonstrated.
(1) Manufacture of main body prototype and bend hole portion prototype As shown in FIG. 1A, a prototype of the main body 9 having holes 11 into which the bend hole portion 10 can be press-fitted is manufactured. In addition, a prototype in which the bend hole 3 is formed as a prototype of the bend hole portion 10 is manufactured.
(2) Press-fitting of the bend hole portion prototype into the main body prototype As shown in FIG.
(3) Cutting As shown in the figure (c), it cuts from the upper part of a main body original mold, and forms the recessed part 2 and the groove | channel 8 grade | etc.,. The recess 2 is formed across the main body 9 and the bend hole 10. The recess 2 is communicated with the bend hole 3.
(4) Completion of William Score Forming Component As shown in FIG. 4D, the William score forming component 1 is obtained through the above-described steps. Also, the William score forming component 1 can be fixed to the mold manufacturing model 6 by carving a thread on the outer peripheral surface 7 of the main body 9.

Next, the mold production model 6 according to an embodiment of the present invention will be described.
The mold manufacturing model 6 shown in FIG. 3A includes a mold gap forming part 12, a hot water forming part 13, and a buried hole 14. The mold gap forming portion 12 is a “portion for casting a casting main body” of the mold 15 (see FIG. 4D), and the shape and number thereof are not particularly limited, depending on the target casting. Is arbitrarily selected. The hot-water feeder 13 is a “portion for forming a hot-water hot spring” of the mold 15, and the shape and number thereof are not particularly limited, and are arbitrarily selected according to the target casting. In general, as the thickness of the target casting becomes thicker, shrinkage cavities due to solidification shrinkage are more likely to occur. Therefore, it is desirable to provide the feeder forming part 13 in the thick mold cavity forming part 12.

The embedding hole 14 is a hole for embedding the William score forming component 1. The embedding holes 14 are formed around the top of the hot water forming portion 13, but the number and position thereof are not limited. It is desirable to cut a thread on the inner peripheral surface 16 of the embedded hole 14. By screwing a screw (male screw) formed on the outer peripheral surface 7 of the William score forming component 1 with a screw (female screw) formed on the inner peripheral surface 16 of the embedded hole 14, the William score forming component 1 is It can be attached detachably.
In addition, what is necessary is just to provide the groove | channel engaged with the protrusion in the internal peripheral surface 16, when providing a predetermined | prescribed protrusion in the outer peripheral surface 7 of the component 1 for William score formation. For example, a groove that opens toward the opening of the embedded hole 14 and extends in the circumferential direction of the inner peripheral surface 16 is formed. A predetermined protrusion provided on the William score side is inserted from the opening direction of the embedded hole 14 and rotated in the circumferential direction to engage with the groove. In this way, the William score forming component 1 can be attached.

With reference to FIG. 3, the manufacturing method of the casting_mold | template 15 and the manufacturing method of a casting which use the components 1 for William score formation and casting_mold | template action model 6 which concern on one Embodiment of this invention are demonstrated. In addition, the code | symbol D shows the division | segmentation surface in the same figure, and shows that the upper mold | type and the lower mold | type are normally manufactured separately for the mold production action model 6. FIG.
(1) Fixing the William Score Forming Part 1 to the Molding Action Model 6 As shown in FIG. 5A, the Williamscore forming part 1 is fixed to the embedding hole 14 of the mold making action model 6. When this fixing is performed, a screwdriver or the like is inserted into the groove 8 to attach the William score forming component 1 to the embedded hole 14. When the outer peripheral surface 7 of the William score forming component 1 and the inner peripheral surface 16 of the embedded hole 14 are threaded, the William score forming component 1 may be screwed into the embedded hole 14. Note that the adhesive material may be applied to the threads of the William score forming component 1 so that the William score forming component 1 is embedded in the embedded hole 14. By doing so, it can be securely fixed.

(2) Manufacture of Cast Frame 17 As shown in FIG. 4B, the cast frame 17 is manufactured and placed on the mold working model 6 in which the William score forming part 1 is embedded. Actually, the mold 17 is put on each die divided by the dividing surface D.
(3) Filling with mold sand As shown in FIG. 3C, by sanding resin-coated sand by cold box molding method (core, blow) between the mold production model 6 and the casting frame 17. Fill with mold sand (see dotted arrow). By filling the mold sand, a prototype of the hollow mold 15 in which the William score 5 is formed is obtained. The mold sand filling is actually performed for each mold divided by the dividing surface D.
(4) Curing of mold sand and completion of mold As shown in FIG. 4D, the filled mold sand is cured (the cured mold sand becomes the mold 15). And although illustration is abbreviate | omitted, the casting mold 6 and the casting frame 17 are removed, and the hardened upper mold sand and the hardened lower mold sand are joined. The joint surface is indicated by a dotted line. As a result, the mold 15 shown in FIG. A William score 5 is formed on the mold 15.

(5) Pressure reduction casting A metal is put into the melting crucible 18 and melted to obtain a molten metal M. The mold 15 is set in the decompression chamber 19 and the gate 20 is immersed in the molten metal M. When the decompression chamber 19 is depressurized from this state, the molten metal M flows through the sprue 20 and the runner 21 and flows into the casting gap 22 and the mekura hot water 23 and solidifies to obtain a casting. Heat concentrates on the William score 5 formed in the Mekura hot water 23, and the molten metal M that has flowed in finally surrounds the William score 5. Therefore, no shrinkage cavity is generated in the casting void 22. If shrinkage can be formed, it will occur in the form indicated by the symbol H around the William score 5, but there is no problem because the portion of the feeder 19 is a part that is cut off.

(6) Replacement of mold making action model 6 According to the above procedure, the mold 15 is repeatedly manufactured using the mold making action model 6. At this time, when the resin adheres to the bend hole 3 or is clogged, or when there is a concern, the William score forming component 1 may be removed and another William score forming component 1 may be fixed.

Next, the operation of the William score forming part 1 and the mold manufacturing model 6 according to an embodiment of the present invention will be described.
When mold sand is blown by the cold box molding method (core, blow) (above (3)), only air escapes from the bend hole 3, and the mold sand accumulates in the recess 2 shaped like the William score. It is formed. However, since the mold sand is coated with resin, the bend hole 3 may be clogged if the mold production model 6 in which the William score forming component 1 is embedded is repeatedly used. Even in such a case, the William score forming part 1 can be removed and replaced with a new one. Therefore, it is not necessary to remanufacture the complete mold manufacturing model, and costs and time are not wasted.

  Furthermore, even if a shape defect occurs in the William score forming component 1, it is only necessary to replace the William score forming component 1, so that deterioration of the quality of the mold caused by continuing to use the defective shape product is avoided. Furthermore, even if the shape failure occurs in the William score forming part 1 and production is stopped at that time, if the William score forming part 1 is replaced, the production can be continued, and thus the production line is adversely affected. Never give.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

  The William score forming part and the mold manufacturing model according to the present invention can be applied to various molds to which a William score is attached. Therefore, it can be used in many industries including the automobile industry.

It is sectional drawing of the component for William score formation which concerns on one Embodiment of this invention. It is a manufacturing-process figure of the components for William score formation which concerns on one Embodiment of this invention. It is a manufacturing process figure of the casting_mold | template using the part for William score formation and casting_mold | template action model which concern on one Embodiment of this invention. It is sectional drawing of a common casting_mold | template. It is a manufacturing process figure of the casting_mold | template using the conventional casting_mold | template action model.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 William score formation part 2 Recess 3 Bend hole 4 Fixing means 5 William score 6 Mold production action model 7 Outer peripheral surface 8 Groove 9 Main body 10 Bend hole part 11 Hole 12 Casting cavity formation part 13 Hot metal formation part 14 Buried hole 15 Mold 16 Inner peripheral surface
17 Casting frame 18 Melting crucible 19 Decompression chamber 20 Pouring gate 21 Runway 22 Casting gap 23 Mekura hot water

Claims (5)

A William score forming part for forming a William score on a mold,
A recess shaped like the shape of the William score;
An air vent bend hole formed at the tip of the recess;
A fixing means formed on the outer surface of the William score forming component and for removably fixing to the mold manufacturing model,
A component for forming a William score, comprising:   The William score forming component according to claim 1, wherein the fixing means is a screw thread. The William score forming component according to claim 1, further comprising a groove formed on a top end face of the William score forming component. A part for casting the casting body;
A mold production model with a part for forming a mekura hot water,
A mold manufacturing model, wherein an embedding hole for embedding the William score forming component according to any one of claims 1 to 3 is formed.   The mold manufacturing model according to claim 4, wherein a thread is carved on an inner peripheral surface of the embedded hole.

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