JP2016019999A - Columnar feeding head shape with high feeding head efficiency and casting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a columnar feeding head shape with high feeding head efficiency compared with a feeding head which employs a conventional circular column as a basic shape.SOLUTION: A feeding head shape has a columnar shape with a diameter D and height H, and satisfies a condition of H/D≥3 and ratio of feeding head volume to product part volume is 40% or less.SELECTED DRAWING: Figure 3

Description

Detailed Description of the Invention

Industrial application fields

  A shape of a feeder used for casting, and a columnar feeder shape and a casting method with high efficiency of the feeder.

  In casting, in order to improve the soundness of the product part, a hot water is provided at an appropriate part of the product, and the solidification shrinkage of the product is replenished from the hot water. A side hot water or a side hot water provided on the side is used. However, in any case, the ratio of the feeder to the casting weight is usually 20 to 40%. As a result, there is a problem that the casting yield indicated by the product weight / casting weight is low. Therefore, the determination of the proper shape and size of the feeder is an important issue for improving the casting yield that affects the cost.

  As casting methods, there are flat casting and vertical casting depending on the relationship between the pouring direction and the parting plane direction of the model. Flat casting is when the pouring direction is perpendicular to the parting plane direction of the model, and vertical casting is when it is parallel. In vertical casting, a relatively free shape of the feeder can be used because of the arrangement of the product portion and the feeder, but a highly efficient feeder shape is not yet determined. On the other hand, in flat casting, since the degree of freedom of the arrangement of the product part and the feeder is small, the shape of the feeder used is considerably limited as described later, so there is no efficient feeder shape and the casting yield is reduced. There is a problem that it cannot be increased. The present invention provides a shape of a columnar feeder having high feeder efficiency that can be applied to both flat casting and vertical casting, and is particularly effective in flat casting.

  Examples of the prior art are shown in FIGS. FIG. 9 shows a state of a mold in which a fried hot water 19 is provided on the upper part of the product part 1. FIG. 10 shows a state of the mold in which the side feeder 20 is provided on the side surface of the product 1. It is generally performed to ensure the soundness of the product part 1 by replenishing the solidification shrinkage of the product part 1 through the weir parts 2 from the feeders 19 and 20 thus provided.

  Conventionally, the shape of the feeder used for casting is basically a cylindrical shape having a diameter D and a height H (hereinafter referred to as a cylindrical shape), and usually H = (1.5-2) The shape is about D. Moreover, the lower mold | type 0.25D and the upper mold | type (1.25-1.75) D are common for the ratio of the upper and lower parts of a feeder's hot water height.

  The basic shape is provided with a weir portion (also referred to as a weir portion) corresponding to a portion connecting the product portion and the basic shape of the feeder. That is, the feeder is composed of a basic shape and a weir part. The same applies to the present invention. In addition, an appropriate draft angle, corner R, corner R, and the like are attached in consideration of mold-up characteristics during molding. The reason why the cylindrical shape is used as the basic shape is that the shape is simple and the model can be easily manufactured, and it is easy to make an appropriate height corresponding to the height of the product portion.

  Further, in the conventional technique, the efficiency of the feeder is simply evaluated using an index of solidification modulus represented by volume / surface area. That is, the one with a large solidification modulus is slow to solidify, and the solidification shrinkage can be replenished for a long time corresponding to the solidification of the product part. The volume of the feeder (the total volume of the basic shape and the weir part) has been determined based on the ratio Mr / Mc of the solidification modulus Mc of the product part and the solidification modulus Mr of the feeder. In general, Mr / Mc = (1 to 1.2) is recommended. That is, since the hot metal requires a larger solidification modulus than that of the product part, a hot water having a cylindrical shape with a large diameter as a basic shape is used so as to ensure a large volume.

  The disadvantage of this cylindrical feeder is that the side surfaces of the feeder side and the upper and lower sides are large, and this becomes a cooling surface (heat dissipating surface) and solidification progresses quickly. Therefore, the volume of the hot water is as large as 40 to 100% with respect to the volume of the product portion, and the ratio to the total casting weight is as large as 20 to 40%. As a result, the casting yield is lowered.

  Thus, the basic problem of the prior art is that the design of the feeder is based on the idea of comparing the solidification moduli of the product part and the feeder. Therefore, a cylindrical shape having a large diameter D and a height of about H = (1.5-2) D has been adopted as a basic shape.

  By the way, it has been clarified from a conventional experiment that the replenishment amount that should be supplied from the hot water to obtain a healthy product is only 3 to 5% of the volume of the product part. If this numerical value is contrasted with the fact that the volume of the hot water is 40 to 100% with respect to the volume of the product part as described above, it must be said that the volume of the hot water is excessively large. This is considered to be a problem with the design of the feeder based on the solidification modulus.

Regarding the prior art, an example of a main casting method using a feeder is shown below from the results of searching the patent literature with the keyword "casting x feeder".
JP2008-212285A JP2007-111741 JP-A-2005-144461 JP-A-10-221333 JP 10-43836 A JP 9-314308 A JP-A-8-290254 JP-A-8-93204 JP-A-5-104195 JP-A-5-69108

Problems that the Invention is to Solve

  The problems of the prior art as described above can be summarized as follows. Generally used hot water is cylindrical, and usually has a shape of about H = (1.5-2) D. This shape is based on the design standard of setting the solidification modulus of the feeder to an appropriate size corresponding to the solidification modulus of the product part. For this reason, it becomes a large diameter feeder and is considered to be a large volume feeder. For this reason, the casting yield is low, which puts pressure on manufacturing costs.

  In view of such problems, an object of the present invention is to provide a shape of a hot-water feeder having high hot-water efficiency based on a new idea that is not based on the concept of the solidification modulus of the prior art. As a result, the casting yield is greatly improved, and the cost of casting products can be greatly reduced.

Means for solving the problem

(Means 1)
The shape of the feeder used for casting, the basic shape of the feeder, excluding the weir part, is a columnar shape with a diameter D and a height H, H / D ≧ 3, and the weir part and the basis of the feeder The shape of the hot water supply is characterized in that the volume of the hot water supply combined with the shape is 40% or less of the volume of the product part.

  In this means, instead of the basic shape of the conventional cylindrical feeder, the volume of the feeder is similar to the column, but H / D ≧ 3 and the weir portion and the basic shape of the feeder are combined. However, the shape of the hot water is 40% or less of the volume of the product part.

  First, by setting the basic shape of the feeder to H / D ≧ 3, a columnar shape having a height higher than that of the conventional shape was used as the basic shape. Here, the columnar shape includes a columnar body having an arbitrary cross section such as a rectangular shape, a polygonal shape, an ellipse shape, and an irregular shape, including a cylindrical shape having a circular cross section. Therefore, the diameter D referred to in the present application refers to the maximum diameter of the cross section on the parting plane.

  If the diameter of the basic shape of the feeder is made the same as that of the prior art, naturally the volume of the feeder is increased and the solidification modulus is not so large. As a result, it becomes a low efficiency feeder. Therefore, in this means, the diameter of the basic shape is made small, the height is made high, and the volume of the hot water including the weir portion and the basic shape of the hot water is made 40% or less of the volume of the product part. As a result, it is possible to obtain a feeder having a small diameter, a high height, and a small volume as compared with the prior art. Next, the operation effect of the feeder shape of this means will be described.

  As described above, the efficiency of the feeder can be generally evaluated by a solidification modulus. However, since the basic shape of the present means is a columnar shape having a small diameter and a high height, naturally, a conventional large diameter and H Compared with /D=(1.5-2), the coagulation modulus is small and the efficiency is low from this point of view.

  Here, the features and operational effects of the basic shape feeder of this means will be described. In the columnar hot water with a small diameter and high height, after the pouring, the solidification and shrinkage of the molten metal in the product part and the cavity start, and when the solidification of the pouring gate and runway proceeds to some extent, The head becomes less effective. As a result, the hot water supply to the product section is supplied only from the hot water, and the molten metal level of the hot water is greatly lowered at an early stage. Since the diameter of the hot water of this means is smaller than that of the conventional cylindrical hot water, the level of the hot water is lower than that of the conventional hot water shape. As a result, a large space is generated between the molten metal at the top of the feeder and the mold cavity. This space is a heated air layer, and this air layer generates a heat insulating action on the molten metal at the top of the feeder. Therefore, the molten metal at the top of the feeder is kept warm and maintained in a molten state for a long time.

  As a result, atmospheric pressure acts from this part for a long time, and hot water supply to the product part is continued. Even in the feeder of this means, solidification of the outer periphery of the cylinder proceeds, but the molten metal inside the feeder flows while being pushed downward by the atmospheric pressure thanks to the molten metal at the top of the feeder that keeps the molten state for a long time. Therefore, the melt state lasts for a long time and maintains a high heat retaining state. That is, the heat retaining property of the hot water of the present application does not depend on the conventionally considered solidification modulus, but utilizes the heat insulation effect by the air layer generated at the top of the hot water, and is based on a completely new technical idea. It is.

  As a result, it was found that if the molten metal is supplied from the feeder to the product part while maintaining appropriate heat retention, the volume of the feeder is sufficient to be 40% or less of the volume of the product part. This value is sufficient even if the amount of hot water supplied to the feeder is usually 3 to 5% of the volume of the product part.

  As described above, the heat retaining property of the small diameter and high height of the present invention seems to be low from the viewpoint of the solidification modulus, but by the heat insulating effect by the air layer at the top of the molten metal that occurs early in solidification, It has been found that it is equivalent or superior to the shape of the prior art feeder. As a result, even if the solidification modulus and volume are small, it has high heat retention and exhibits high hot water supply capability for the product part. That is, by using the columnar hot spring having a small diameter and a high height according to the present invention as a basic shape, a sufficient hot water effect can be obtained with a hot water having a small volume compared to a conventional hot water. Therefore, the casting yield which has been a problem can be greatly improved.

  The “basic shape of the feeder” in the present invention will be described. Even if it is a generally used cylindrical feeder, the basic shape is not used as it is for any type of feeder. Usually, the basic shape is modified and used in an appropriate shape so as to be easy to use as a cast model. For example, an appropriate draft angle, corner R, corner R, etc. are attached for mold punching, and a conical hole or V-groove is provided on the top of the feeder to induce shrinkage of the feeder, or a William score is provided. Or, a part of the shape of the hot water is cut from the relationship with the product part, or a surplus is added. In some cases, a bar-like portion having a diameter smaller than the hot metal diameter may be additionally provided on the basic shape of the hot metal to give a height, that is, a molten metal head (molten metal pressure). However, the shape of the basic feeder is clear from its shape. Therefore, the basic shape of the feeder in the present invention is also used with such appropriate modification and deformation.

(Means 2)
In the casting method using the shape of the feeder as described in means 1, the casting method is characterized in that a part of the runner connected to the feeder is provided with a plate-like channel having a cooling rate faster than that of the runner.

  In the means 2, a plate-like flow path having a cooling rate faster than that of the runner is provided in a part of the runway connected to the hot water. As described above, it is important to generate an air layer with high heat insulation at the top of the feeder in the shape of the feeder having a small diameter and high height as described above. In this regard, it has been found that, after pouring, if the molten metal head (molten metal pressure) from the gate portion, that is, the gate rod and the gate cup, acts for a long time, an adverse effect occurs in generating an air layer. For this reason, a plate-like flow path that is rapidly solidified is provided in a part of the runner in order to quickly shut off the effect of the melt head from the spout stick and the spout cup. As a result, the molten metal head from the gate is cut off early, and as the molten metal in the product portion solidifies, an air layer with high thermal insulation is formed at an early stage, and the heat retaining property of the hot water can be secured.

  As the plate-like channel, a plate-like runner on the parting surface may be simply used, or a plate-like channel may be provided in a direction perpendicular to the parting surface. A plate shape that is as thin as possible while ensuring an area that is approximately equal to the area of the base runner is suitable for generating an air layer at the top of the feeder at an early stage.

(Means 3)
In the casting method using the shape of the feeder as described in the means 1, the difference (h1) between the molten metal surface height h1 at the gate from the mold parting surface and the molten metal surface height h2 at the top of the molten metal when pouring is completed. The casting method is characterized in that -h2) is 100 mm or less.

  As described above, it is important to generate an air layer at the top of the feeder in the shape of the feeder having a small diameter and a high height. For this purpose, it is more effective that the molten metal head from the gate part (gate gate and gate cup) is lower. Therefore, in order to lower the molten metal head from the gate, the molten metal head is lowered by reducing the amount of pouring. The amount of pouring for that is adjusted so that the difference (h1-h2) between the pouring height h1 at the gate from the mold parting surface and the pouring height h2 at the top of the pouring bath is 100 mm or less when pouring is completed. (80 mm or less is more effective depending on the mold size, product part height, etc.). This is because the tendency to delay the formation of the air layer at the top of the hot water usually becomes strong at 100 mm or more. In addition, the upper limit of the amount of pouring reduction is decided from the height of a product part, and it is natural that the molten metal height of the upper surface of a gate cup does not fall below the height of a product part.

  In the conventional casting method, the hot water level after pouring is always higher than the hot water surface height of the product part and the top of the hot water, and the hot water cup is poured up to the upper limit to the middle stage. Pouring was performed so that the difference between the hot water surface height at the spout and the hot water top was reduced to 100 mm or less. Thereby, in addition to the molten metal saving by the basic shape of the hot water supply of this application, the pouring amount of the pouring gate part is reduced.

  This operation will be described. By making the difference between the hot water surface height at the gate and the hot water top at 100 mm or less, when the molten metal in the cavity starts to solidify and shrink, the hot water surface at the gate starts to drop greatly. When the height of the surface reaches the top of the hot water, the hot water surface at the top of the hot water starts to fall. As a result, a thick air layer is formed at the top of the feeder, and the heat insulation of this air layer keeps the molten metal at the top of the feeder and keeps it in a molten state. It works for a long time to increase the hot water effect. Since the time and thickness at which this air layer is formed become thicker earlier than the means 1 and 2, the hot water supply effect as a feeder is further improved. Considering this effect, it can be said that the difference between the height of the top of the feeder and the height of the gate is zero, that is, the height of the feeder and the height of the gate may be the same. Of course, the height of the gate cannot be lower than the height of the product portion.

  In addition, when the pouring amount is such that the pouring cup is almost filled as in the prior art, the molten metal volume at the pouring cup portion is large, so that the lowering of the pouring surface in the pouring portion due to the solidification shrinkage of the molten metal in the cavity is small. There is almost no effect like means. As a result, the molten metal at the top of the feeder is maintained in contact with the mold cavity, so that it is easy to form a solidified film, and therefore, it is difficult to achieve conditions under which atmospheric pressure acts. Therefore, the hot water supply capacity of the hot water depends on the solidification modulus of the hot water, and a large volume of hot water is required.

Action

In the means 1, the shape of the hot water supply having high hot water efficiency with a small diameter and high shape as the basic shape is specified, and the volume of the hot water (the weir portion and the basic shape portion) is specifically defined and small. A columnar hot-water shape with a high hot-water-feeding effect was provided. Further, in the means 2, when the hot water of the present invention is actually used, a plate-like flow path that is rapidly solidified is used in a part of the runner in order to efficiently generate an air layer at the top of the hot water. Moreover, in the means 3, the method of reducing the amount of pouring was proposed as a method which can further reduce molten metal while further enhancing the effect of the hot water. As a result, the casting yield, which has been a problem of the prior art, can be greatly improved. As a result, it is possible to greatly reduce the amount of molten metal required for the hot metal, and to significantly reduce the power consumption for melting and the cost of molten metal treatment. It also greatly contributes to CO ² reduction.

  The present invention will be described in detail below, but the present invention is not limited to these examples.

  A first embodiment using the means 1 is shown in FIGS. In this example, the basic shape of the hot water excluding the dam portion is a columnar shape with a diameter D and a height H, and H / D ≧ 3, and the basin shape is a combination of the dam portion and the basic shape of the hot water. The shape of the hot water having a volume of 40% or less of the volume of the product part will be described.

FIG. 1 shows an example of the conventional technology. The product ³ having a volume Vc = 1690 cm ³ and a solidification modulus Mc = 1.46 cm is a conventional hot-water feeder shape, and the height 3 of the basic shape of the hot-water supplier is high. / Roller ratio A (H / D) is a cylindrical shape with H1 / D1 = 2, and the feeders A and 4 provided with the weir part 2 are provided on the product part 1 as side feeders. The dimensions of the basic shape portion 3 are D1 = Φ8.0 cm, H1 = 16 cm, V1 = 803 cm3 ^{, and} solidification modulus M1 = 1.56 cm. The volume of the weir part is 65 cm ³ . Accordingly, the volume Vr1 of the feeders A and 4 is Vr1 = 868 cm ³ . The volume ratio of the feeder A to the product part 1 is Vr1 / Vc = 0.51.

FIG. 2 is an example of the embodiment of the present application, and is an example in the case of the feeders B and 5 with H / D = 3. The dimensions of the basic shape portion 3 are D2 = Φ6.4 cm, H2 = 19.2 cm, V2 = 617 cm ³ , and M2 = 1.41 cm. The volume of the weir portion 2 is 60 cm ³ . Accordingly, the volume Vr2 of the feeders B and 5 is Vr2 = 737 cm ³ . The volume ratio of the feeder B to the product part 1 is Vr2 / Vc = 0.40.

FIG. 3 is another example of the present application and is an example in the case of the feeders C and 6 with H / D = 5. The dimensions of the basic shape portion 3 are D3 = Φ4.8 cm, H3 = 24.0 cm, V2 = 435 cm ³ , and M3 = 1.09 cm. The volume of the weir part 2 is 55 cm ³ . Accordingly, the volume Vr3 of the feeders C and 6 is Vr3 = 490 cm ³ . The volume ratio of the feeder C to the product part 1 is Vr3 / Vc = 0.29. Both the hot water B and the hot water C are reduced in volume compared to the conventional hot water A.

  As a result of pouring a melt of spheroidal graphite cast iron into the mold provided with the above three feeders and observing the presence or absence of defects in the product part 1 after solidification, there were no shrinkage defects in the product part 1 in all three ways. Was healthy. FIG. 4 is a schematic diagram showing the state of each hot-spring closing at that time. In the conventional hot water A, the shrinkage 9 centered on the hot water top 8 is generated, and it can be seen that the molten metal volume of this portion is supplied to the product portion 1. It can be seen that there are many portions that are not closed in the lower part of the hot water supply 10, there is waste of the hot water, and the efficiency of the hot water supply is poor.

  In the case of the hot water supply B of H / D = 3 of the present application, since the height of the hot water is small and the height of the hot water is high, the lowering of the molten metal level at the hot water top portion 8 at the initial stage after the pouring is performed. Since it became larger than A, the shrinkage | contraction has generate | occur | produced to the quite deep part of the feeder. It can be seen that the volume of the shrinkage is slightly larger than that of the feeder A, and the efficiency of the feeder is increased. This is because the height of the hot water rises, the drop in the initial molten metal level at the top of the hot water after pouring is completed, and a large air layer is formed at the top of the hot water, resulting in heat insulation. It is.

  In the case of the hot water C of H / D = 5 of the present application, since the diameter was further reduced and the height of the hot water was increased, the lowering of the molten metal level at the hot water top 8 was pushed at the initial stage after pouring. It is larger than the hot water B and is deeply drawn to the bottom of the hot water. The volume of the shrinkage is almost the same as that of the hot water B. In the hot water supply C, since the height of the hot water supply is further increased, the air layer at the top of the hot water supply is further increased, and it is estimated that the shrinkage is continued to the depth of the hot water supply. In this feeder, the volume of the feeder is 29% of the product volume, but the lower limit of this value is about 15%. It becomes difficult to generate an air layer.

  FIG. 5 shows an example in which the feeders C and 6 in FIG. In this case, the function and effect are the same as described above. In this case, since the hot water is filled with the molten metal having passed through the product part 1 and having a slightly lowered temperature, there is a possibility that the hot water is not sufficiently closed in the small diameter hot water, An appropriate diameter is used. Alternatively, it is also effective to use a heat generating sleeve, a heat insulating sleeve or the like together.

  In this way, the shape of the feeder is H / D ≧ 3 and the volume of the feeder is 40% or less of the product part volume, but the solidification modulus is reduced. It has become possible to reduce the volume of molten metal, that is, to reduce molten metal. This is because, as mentioned above, in the small diameter and high columnar hot water of the present application, the molten metal level at the top of the hot water after pouring is greatly reduced, and the heat insulation effect by the air layer generated there acts it is conceivable that. This is the new technical idea of the present application. Incidentally, the molten metal reduction ratios of the present hot water B and the hot water C with respect to the conventional hot water A are 22% and 43%, respectively. The H / D ratio to be adopted is determined as appropriate depending on the product shape, height, mold size, and the like.

  A second embodiment using the means 2 is shown in FIGS. In this example, in the casting method using the shape of the feeder described in Example 1, a plate-like flow path having a cooling rate faster than that of the runner is provided in a part of the runner connected to the feeder. A casting method will be described.

  In FIG. 6, similarly to the first embodiment, the feeder 6 of the feeder C (H / D = 5) is provided as a side feeder in the product portion 1, and a part of the runner 7 connected to the feeder 6 is plate-shaped. It becomes this flow path 11. The plate-like flow path 11 is formed in a thin plate shape so that it is solidified immediately after the pouring is completed. This is because the product portion 1 and the hot water 6 are quickly solidified after the pouring is completed, so that the product portion 1 and the pouring gate 6 are quickly shut off from the pouring passage 7 and the pouring gate portion 14 (consisting of the pouring cup 12 and the pouring bar 13). It is.

  As a result, the solidification shrinkage of the product part 1 is supplied only by the feeder 6. That is, the feeder 6 supplies the molten metal to the product part 1 with almost no hot water supplied from the spout part 14. Therefore, the small diameter and high feeder of the present application is liable to lower the melt level at the top of the feeder early, and the thick air layer 15 generated there causes a heat insulation action, causing the top of the feeder 8 to close. As a result, a high feeder effect is produced. This effect is a further enhancement of Example 1. As a result, it is possible to more stably carry out the hot water supply efficiency of the columnar hot water having a small diameter and high height according to the present application.

  FIG. 7 is a cross-sectional view showing an example of the plate-like channel 11. (A) is simply a plate-like channel 11 parallel to the parting surface 16, and (b) is a plate-like channel 11 parallel and perpendicular to the parting surface. As described above, the plate-like flow path of the present application has the same effect as long as the shape is arbitrary, the plate portion is thin, and the solidification is quicker than the runner 7. An appropriate plate shape can be used so as to ensure the same cross-sectional area with respect to the runner 7.

  FIG. 8 shows a third embodiment using the means 3. In this example, it is a casting method using the shape of the hot water described in Example 1, and when pouring is completed, the hot water surface height h1 of the pouring gate part from the mold parting surface and the hot water surface height of the hot water top part. A casting method in which the difference (h1−h2) in h2 is 100 mm or less will be described.

  In FIG. 8, with the structure of the hot water supply C of Example 1, the hot water supply C and 6 are provided in the product part 1 as a side hot water supply. This figure shows a state where pouring has been completed, and the pouring height h1 of the pouring gate portion 14 does not fill the pouring cup 12 and is halfway up to the pouring bar 13. The difference in height between the height h1 and the hot water surface height h2 at the top of the feeder is a small difference of 100 mm or less as indicated by (h1-h2). For this reason, when the solidification of the product part 1 starts after the pouring is completed, the molten metal level 17 of the pouring gate part starts to decrease first, and reaches the height of the molten metal level 18 of the molten metal top part 8, and then the hot water top part The melt level 18 of 8 begins to drop. However, normally, before the molten metal level 17 at the gate reaches the height of the top 8 of the hot water, the solid phase ratio of the gate 14 or the runway 7 increases and the fluidity of the molten metal decreases. Since the molten metal head does not act on the hot water top 8, the molten metal level at the hot water top 8 often starts to decrease at that time. Therefore, when (h1-h2) is 100 mm or less, the effects of the present application are sufficiently obtained.

  As a result, a thicker air layer is formed at the top of the feeder than in the first and second embodiments. As a result, due to the heat insulation effect of the air layer, the top portion of the feeder is kept in a melted state for a long time, the state where atmospheric pressure is easily applied is maintained, and the feeder effect is continued. This basic function and effect are the same as in the first and second embodiments. As described above, it was confirmed that the above-described effects can be obtained by setting the difference between the height h1 of the gate and the height h2 of the hot water as small as possible, which is 100 mm or less in the present application. However, depending on casting conditions, 80 mm or less may be more effective. In the limit, the difference (h1−h2) between the hot water surface height h1 of the gate 14 and the hot water surface height h2 of the hot water top 8 may be zero. However, naturally, the height h1 of the gate part 14 cannot be made lower than the height of the product part 1. In the drawing, the molten metal level 17 of the gate 14 is lower than the lower part of the gate 12, but the molten metal level 17 does not necessarily need to be lower than the gate 12 in this way.

  As a result, in addition to the molten metal reduction due to the shape effect of the hot metal of the present application, the molten metal in the sprue portion 14 is reduced, and the molten metal can be further greatly reduced. Thus, Example 2 and Example 3 are means for implementing Example 1 more stably.

Effect of the invention

  As described above, the present invention provides a shape of a hot water base that is based on a columnar hot water having a new small diameter and a high height, compared to the shape of a conventional cylindrical water base. The solidification modulus is small compared to the shape of the cylindrical feeder, but the heat insulation effect by the air layer at the top of the feeder shows the same effect as that of the conventional feeder, and a large reduction in molten metal is possible. A significant improvement was obtained. As a result, we were able to contribute greatly to power reduction, which is an urgent problem in the casting industry.

  It is a figure of the prior art compared with Example 1 of this invention.   It is a figure which shows Example 1 of this invention.   It is a figure which shows another example of Example 1 of this invention.   It is a figure which shows the closed state of the hot water supply of Example 1 of this invention.   It is a figure which shows another example of Example 1 of this invention.   It is a figure which shows Example 2 of this invention.   It is sectional drawing of the plate-shaped flow path of Example 2 of this invention.   It is a figure which shows Example 3 of this invention.   It is a figure which shows an example of the deep-fried hot water of a prior art.     It is a figure which shows an example of the side feeder of a prior art.

1 Product part 2 Weir part 3 Basic shape part of feeder 4 Feeder A
5 Sewer B 6 Sewer C 7 Sewer 8 Sewer Top 9 Close 10 Lower Sewer 11 Plate-shaped Channel 12 Faucet Cup 13 Faucet Bar 14 Faucet Port 15 Air Layer 16 Closed Surface 17 Molten Metal Level 18 Melt level at the top of the hot water 19 Lifting hot water 20 Side hot water

Claims (3)

  The shape of the feeder used for casting, the basic shape of the feeder, excluding the weir part, is a columnar shape with a diameter D and a height H, H / D ≧ 3, and the weir part and the basis of the feeder The shape of the hot water supply is characterized in that the volume of the hot water supply combined with the shape is 40% or less of the volume of the product part.   2. A casting method using the shape of the feeder as claimed in claim 1, wherein a plate-like flow path having a cooling rate faster than that of the runner is provided in a part of the runner connected to the feeder. .   A casting method using the shape of the feeder according to claim 1, wherein when the pouring is completed, a difference between a molten metal surface height h1 at the gate from the mold parting surface and a molten metal surface height h2 at the top of the feeder ( h1-h2) is 100 mm or less, The casting method characterized by the above-mentioned.

Images