JP5758535B1 - Manufacturing method of metal molded product and image - Google Patents

Abstract

A manufacturing method of a metal molded product, a casting, and an image capable of suppressing an error in arrangement of cooling metal. A casting is produced by arranging a cooling metal plate based on an image (50) prepared in advance. The chillers are arranged according to the direction, positional relationship, and number of chillers shown in the image (50). By arranging the cooling metal based on the sample image showing the correct arrangement of the cooling metal, it is possible to suppress an error in the arrangement of the cooling metal and to suppress the generation of voids due to the shrinkage of the metal molded product. [Selection] Figure 4

Description

  The present invention relates to a method of manufacturing a metal molded product manufactured by disposing a cooling metal.

  Conventionally, as a casting technique for producing a casting, a molten metal or alloy (hereinafter referred to as “molten metal” as appropriate) is poured into an inner space of a mold, solidified and cooled, and then taken out from the mold. It has been.

  In Patent Document 1 below, the cooling metal is arranged along the surface of the internal space of the mold. The cooling metal is usually disposed on the surface of the mold that is in contact with a portion of the internal space having a large volume. When the large volume portion is thicker than the other portions, the molten metal injected into the large volume portion has a slower cooling rate than the other portions. As a result, voids due to shrinkage may occur inside the thick part of the casting.

  Therefore, it is possible to increase the cooling rate of the injected molten metal by arranging cooling metal along the surface of the space portion having a large volume. Thereby, it can suppress that the space | gap by shrinkage arises inside a casting.

JP 2012-121040 A

  However, in the past, when the worker placed the cooling metal, it was sometimes mistakenly placed. For example, the direction of the cooling metal, the relative positional relationship between the cooling metals, or the number of cooling metals may be wrong. If the cooling metal is misplaced as described above, the cooling rate of the molten metal cannot be controlled appropriately, and defects such as voids due to shrinkage may occur.

  Furthermore, when casting a casting with a sand mold, a cooling mold is arranged to make a sand mold every time the casting is manufactured. In addition, the arrangement of the cooling metal may be performed manually. In this case, there is a problem that the arrangement of the cooling metal is easy to make an error.

  This invention is made | formed in view of the point which concerns, and it aims at suppressing the mistake of arrangement | positioning of a cooling metal.

The method for producing a metal molded product according to the present invention includes an inner surface of a molded part for forming a metal molded product, the inner surface of the molded part forming a thin part of the metal molded product, and the meat of the metal molded product. to each of the inner surface of the forming unit for forming a thick portion, the shape is arranged gold correctly cooled for different metals Rutotomoni, several shapes arranged plurality of different chill the same plane Based on an image displaying the arrangement of the cooling metal on the sand mold model prepared in advance , a plurality of the cooling metal having different shapes are arranged to form the sand mold, and the sand mold The metal molded article is manufactured using
In the present invention, the molding portion includes at least a first space and a second space having different sizes, and the first space is larger than the second space, and the first space and the second space When the cooling metal is disposed on each of the inner surfaces of the second space, the first cooling metal is disposed on the inner surface of the first space, and the first cooling metal is disposed on the inner surface of the second space. Based on the image prepared in advance, the chillers having different sizes are arranged to form the sand mold so that the second chillers smaller than the chillers are arranged correctly. Can do.

  In the present invention, a sample image showing the correct cooling metal arrangement is prepared in advance, and the cooling metal is arranged based on this image. Therefore, it is possible to suppress an error in arrangement of the cooling metal as compared with the conventional case. As a result, the generation of voids due to the shrinkage of the metal molded product can be suppressed.

In this invention, the said cooling metal can be arrange | positioned according to the direction of the cooling metal shown by the said image. In this invention, it is preferable that the notch which shows the direction at the time of arrangement | positioning is provided in the said cooling metal. Moreover, the said some cooling metal can be arrange | positioned according to the positional relationship of each cooling metal shown by the said image. Furthermore, the number of the cooling golds can be arranged according to the number of cooling golds shown in the image.

  As described above, the placement of the cooling metal, which is easy to be mistaken in the manual work, is performed in accordance with the arrangement of the cooling metal shown in the image, so that the placement error can be suppressed.

The present invention is suitable for aluminum or aluminum alloy structure for casting by the sand mold.

The image in the present invention is an inner surface position of a molded part for forming a metal molded product, and an inner surface position of the molded part that forms a thin part of the metal molded product and a thick part of the metal molded product. A plurality of metal chillers having different shapes corresponding to each of the inner surface positions of the molded part to be formed are disposed on the sand mold model, and the plurality of chillers having different shapes are identical to each other. The arrangement on a plane is displayed. By using this image, the cooling metal can be appropriately disposed on the model, so that the cooling metal can be disposed at a predetermined position in the sand mold for producing the casting.

  According to the present invention, it is possible to suppress an error in the arrangement of the cooling metal as compared with the related art. As a result, the generation of voids due to the shrinkage of the metal molded product can be suppressed.

It is a cross-sectional schematic diagram of the casting_mold | template used for manufacture of the casting which concerns on this Embodiment. It is a cross-sectional schematic diagram of the casting which concerns on this Embodiment. It is the plane schematic diagram which has arrange | positioned each cooling metal in the predetermined position. It is a schematic diagram which shows the photograph which shows arrangement | positioning of the cooling metal shown in FIG. 3, the top view of a model, and the cooling metal to arrange | position. It is a cross-sectional schematic diagram of the model and cooling metal in the manufacturing method of the casting which concerns on this Embodiment. It is a cross-sectional schematic diagram of the model in the manufacturing method of the casting which concerns on this Embodiment, a cooling metal, and a casting_mold | template. It is a model in a manufacturing method of a casting concerning this embodiment, and a cross-sectional schematic diagram of a cooling metal and a mold. It is a cross-sectional schematic diagram of the casting_mold | template in the manufacturing method of the casting which concerns on this Embodiment. It is a cross-sectional schematic diagram of the casting_mold | template and casting in the manufacturing method of the casting which concerns on this Embodiment. It is a schematic diagram of the tablet screen on which arrangement | positioning of the cooling metal which concerns on this Embodiment was displayed.

  EXAMPLES Hereinafter, although this invention is further explained in full detail based on an Example, these are described for description and this invention is not limited to the following Example.

  FIG. 1 is a schematic cross-sectional view of a mold 20 used for manufacturing a casting according to the present embodiment. FIG. 2 is a schematic cross-sectional view of a casting 37 according to the present embodiment.

  The mold 20 has an upper mold 21 and a lower mold 24. The mold 20 may be a sand mold, a mold, or the like, but a sand mold is preferably used because of the advantages and cost of providing the cooling mold according to the present embodiment. In the case of a sand mold, water glass, cement, resin, or the like can be mixed as a binder to increase the strength.

Between the upper mold 21 and the lower mold 24, an internal space (molded portion) 30 of the mold 20 is formed. In the internal space 30, cooling metals 31 to 36 are arranged along the inner surface constituting the internal space 30. The molten metal is injected into the internal space 30 from a flow path (not shown). The injected molten metal is cooled and solidified. Thereafter, when the mold 20 is removed, a casting (metal molded product) 37 shown in FIG. 2 is obtained.

  Metal molded products are used in various fields, for example, in addition to being used for machine tools, automobiles, aircraft, daily necessities, and the like. Among metal molded products, those formed by casting are castings. This embodiment is particularly suitable for a casting manufacturing method, but can also be applied to a metal molded product manufactured by extrusion molding or the like.

  The material of the casting (metal molded product) 37 is not particularly limited. For example, aluminum, aluminum alloy, bronze, nickel alloy, stainless steel, and the like can be exemplified. Among these, this embodiment is particularly suitable for a casting formed by casting aluminum or aluminum alloy with a sand mold.

  The cooling metals 31 to 36 are appropriately arranged according to the size of the internal space 30 of the mold 20, the position where the molten metal is poured, and other conditions. The example of arrangement | positioning of the cooling gold | metal | money 31-36 is demonstrated below. The mold 20 has a small space 30a, a middle space 30b, and a large space 30c in the internal space 30. Here, the small space 30a, the middle space 30b, and the large space 30c can be defined in the order of increasing volume, cross-sectional area in the longitudinal section, or height dimensions h1, h2, and h3.

  For example, the cooling metals 31 to 36 are arranged in the area in contact with the middle space 30b and the large space 30c, and the cooling gold is not arranged in the area in contact with the small space 30a. The chillers 31 and 32 disposed in the region in contact with the large space 30c may have a larger volume than the chillers 33 to 36 disposed in the region in contact with the middle space 30b. Alternatively, the cooling metals 31 and 32 disposed in the large space 30c may be thicker than the cooling metals 33 to 36 disposed in the middle space 30b. Further, the area where the large space 30c is in contact with the mold 20 and the large space 30c are cooled by the ratio of the area where the intermediate space 30b is in contact with the mold 20 and the area where the intermediate space 30b is cooled and in contact with the gold 33-36. The ratio with the area which touches 31 and 32 may be large. The material for the cooling metal is not particularly limited, but can be made of a metal having a melting point higher than the temperature of the molten metal.

  As described above, the cooling metal is disposed in consideration of the size of the internal space 30 and other factors. Therefore, it is necessary to appropriately arrange the cooling metals 31 to 36 without making a mistake. If the mold 20 is a sand mold, it is necessary to make the mold 20 every time the casting 37 is manufactured. Therefore, it is necessary to make sure that the arrangement of the cooling metal is not mistaken each time.

  In the present embodiment, as described below, the correct arrangement of the cooling metal is imaged in advance, and the cooling metal can be arranged by using the image as a sample. This makes it possible to effectively and easily suppress errors in the arrangement of the cooling metal.

  Hereinafter, the manufacturing method of the casting 37 of this Embodiment is demonstrated. First, the cooling metal is correctly arranged, and the arrangement is imaged. FIG. 3 is a schematic plan view showing a state in which each cooling metal is arranged at a predetermined position. That is, as shown in FIG. 3, each cooling metal 31-36, 41-44 is correctly arrange | positioned on the model 40 for manufacturing a casting_mold | template. A pedestal 40 a having the same shape as the region on the lower mold 24 side of the internal space 30 is formed on the model 40 so as to protrude. Each cooling metal 31-36, 41-44 is arrange | positioned on the upper surface and side surface of the base 40a.

  As shown in FIG. 3, the cooling metals 31 to 36 and 41 to 44 are plural, and the shapes are plural and not uniform. Here, arranging the cooling gold correctly means arranging the cooling gold in consideration of one or more or all of the orientation of the cooling gold, the positional relationship of each cooling gold and the number of the cooling golds arranged. In addition, the cooling metal is not disposed at a position where the cooling metal should not be disposed.

  The direction of the cooling metal will be described. As shown in FIG. 3, the cooling metal 32 has a shape in which two corners of a rectangular four corners are cut obliquely. Reference numeral 32a indicates a notch. If the orientation of these notches 32a differs by 90 degrees or 180 degrees from the predetermined arrangement, the predetermined cooling effect due to the arrangement of the cooling metal 32 cannot be obtained. Therefore, it is necessary to arrange the direction of each cooling metal correctly. Similarly, notches are formed in the chillers 33, 34, and 36, and the chillers 33, 34, and 36 are arranged in a state where these notches are oriented in an appropriate direction. The shape of the cooling metal is not limited, and is appropriately determined according to the shape of the internal space, such as a curved shape, an ellipse, or a circle, in addition to the rectangular shape. As described above, according to the present embodiment, it is possible to prevent an error in the direction of the cooling metal regardless of the shape of the cooling metal.

  The positional relationship of each cooling metal will be described. As shown in FIG. 3, the distance between the chillers and the arrangement of the chillers having different shapes are adjusted. For example, the distance between the cooling gold 32 and the cooling gold 33 (the distance between the cooling golds or the distance between the centers) is longer than the distance between the cooling gold 41 and the cooling gold 42. Further, the cooling golds 34 and 36 and the cooling gold 35 have different shapes, and the cooling gold 35 is arranged in the middle and the cooling golds 34 and 36 are arranged on both sides thereof. A predetermined cooling effect cannot be obtained unless the distance between the chillers and / or the arrangement of the chillers having different shapes are correct. Therefore, it is necessary to arrange a plurality of chillers correctly with respect to each other. For example, as shown in FIG. 3, a mark 45 is marked on the model 40 between the cooling gold 32 and the cooling gold 33, and it can be seen that no cooling gold is placed in the mark 45 portion. You can also keep it.

  Further, the number of cooling golds to be arranged is also included in the concept of arrangement. For example, as for the positional relationship of each cooling metal, there may be a case where a minimum condition such as not placing the cooling metal in the mark 45 portion may be cleared. Even in such a case, it is preferable not to make a mistake in the number of cooling metal arrangements.

  Each cooling metal 31-36, 41-44 is correctly arrange | positioned, and each cooling gold arrangement is imaged. For example, imaging is performed with a commercially available digital camera, but the imaging means is not particularly limited. As for the arrangement of the cooling metal, an entire image, a partial image, a planar image, a side image, a bird's-eye image, or the like can be used, but it is preferable to have an entire image on a plane. It is preferable that an identification number or an identification symbol or the like is placed on the image together with the arrangement of the cooling metal. The identification number or the identification symbol or the like may be, for example, an image obtained by arranging a plate or the like on which the identification number or the identification symbol or the like is placed together with the model 40 when the cooling metal is arranged and imaged. It may be input to an image. Thereby, the model 40 can be identified.

  As described above, an image with each chiller correctly placed is printed into a photograph. FIG. 4 is a schematic diagram showing a photograph showing the arrangement of the cooling metal shown in FIG. 3, a plan view of the model, and the cooling metal to be arranged. As shown in FIG. 4, the operator can use the photograph (sample image) 50 to correctly place the cooling metals 31 to 36 and 41 to 44 on the model 40. The use of the photograph 50 can include an act of confirming the photograph 50, for example, by viewing or memorizing the photograph 50. As a result, regardless of the years of experience in casting production, and when producing a new casting, any worker can appropriately and speedily execute each cooling metal arrangement without making a mistake. .

  In particular, as described above, it is possible to effectively reduce the probability of mistakes in the direction of the cooling metal, the positional relationship between the plurality of cooling metals, or the number of arrangements of the cooling metals.

  FIG. 5 to FIG. 9 are schematic cross-sectional views for explaining the casting manufacturing method according to the present embodiment.

  FIG. 5 shows a state in which the cooling metals 31 to 36 and 41 to 44 are correctly arranged on the model 40. A cast frame 25 is disposed around the model 40, and the model 40 is surrounded by the cast frame 25. Although not particularly limited, examples of the material of the model 40 include wood, metal, and thermosetting resin, and examples of the material of the cast frame 25 include wood and metal.

  Next, as shown in FIG. 6, casting sand 26 is filled into a space surrounded by the casting frame 25 of the model 40, and molding is performed. Subsequently, as shown in FIG. 7, the cast sand (sand mold) 26 that has been molded is punched out of the model 40, whereby the lower mold 24 having the cooling metal shown in FIG. 1 can be formed. In FIG. 7, the casting frame 25 is detached from the lower mold 24 together with the model 40, but may be attached to the lower mold 24. By turning the lower mold 24 shown in FIG. 7 upside down, the lower mold 24 shown in FIG. 1 is obtained.

  The upper die 21 and the core (not shown) are manufactured, and the upper die 21 and the lower die 24 are overlapped as shown in FIG. An inner space 30 is provided in the mold 20.

  And as shown in FIG. 9, the molten metal 60 is inject | poured from the flow path which is not shown in figure. The injected molten metal 60 is cooled and solidified in the internal space 30 of the mold 20. And the casting 37 (refer FIG. 2) which consists of predetermined shape can be manufactured by removing the casting_mold | template 20. FIG. In the present embodiment, cooling metal is in contact with the thick portion of the injected molten metal 60. For this reason, among the injected molten metal, heat dissipation in the region close to the cooling metal is promoted, and solidification of the molten metal can be accelerated. Thereby, since the dispersion | variation in the speed at which the molten metal solidifies in the thick part and thin part of the casting 37 (refer FIG. 2) can be suppressed, the internal defect of the manufactured casting 37 can be suppressed. In particular, in the present embodiment, a sample image that correctly indicates the arrangement of the cooling metal is prepared in advance, and the cooling metal is arranged based on this image. Accordingly, it is possible to suppress an error in arrangement of the cooling metal. As a result, the generation of voids due to the shrinkage at the thick portion of the casting 37 can be suppressed, and the defective product rate can be effectively suppressed.

  The present embodiment is particularly suitable for a configuration in which aluminum or an aluminum alloy is cast by a sand mold. The light casting 37 can be made by using a light alloy such as aluminum. In addition, since aluminum or aluminum alloy has higher thermal conductivity and thermal expansion coefficient than iron or the like, it is necessary to promote the cooling rate in the thick portion. Therefore, the cooling metal is disposed in the mold 20 and the cooling metal is appropriately disposed at a predetermined position in the internal space 30 to increase the cooling rate at the thick portion of the casting 37, thereby increasing the thickness of the casting 37. It is possible to suppress the generation of voids due to shrinkage in the thick part with higher accuracy than in the past.

  Further, in the casting 37 manufactured by the manufacturing method according to the present embodiment, the cooling metal was disposed in the internal space 30 of the mold 20 depending on the surface state of the surface and the side surface, particularly in a state where the polishing process was not performed. You can know whether or not.

  As illustrated in FIG. 4, the photograph 50 is illustrated as an example of the sample in which the cooling metal is correctly arranged. However, the photograph 50 is not limited to the photograph 50. The image showing the arrangement of the cooling metal is not limited to a two-dimensional image, and may be a three-dimensional image. In that case, a three-dimensional image showing the arrangement of the cooling metal may be displayed using a three-dimensional display device, or a miniature or full-scale model may be manufactured.

  FIG. 10 is a schematic diagram of the tablet screen on which the arrangement of the cooling metal according to the present embodiment is displayed. As shown in FIG. 10, an image can be projected on the display screen 75a of the tablet 75, a display screen of a mobile phone, a smartphone, or the like. Further, for example, an image in which the cooling metal is correctly arranged can be stored in a hard disk device or a memory and displayed on a display screen of a personal computer or a television screen. Thus, the operator can use the image to correctly place the cooling metal.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a configuration having a cooling metal when manufacturing a metal molded product used for machine tools, automobiles, aircraft, daily necessities and the like. In particular, the present invention is suitable for a casting manufacturing method performed by injecting molten metal into an internal space of a mold such as a sand mold.

20 Mold 21 Upper mold 24 Lower mold 25 Cast frame 26 Cast sand 30 Internal space 30a Small space 30b Medium space 30c Large space 31, 32, 33, 34, 35, 36 Cooling metal 32a Notch 37 Cast 40 Model 40a Base 41, 42, 43, 44 Cooling gold 45 Mark 50 Photograph (sample image)
60 molten metal

Claims (8)

An inner surface of a molded part for forming a metal molded product, an inner surface of the molded part that forms a thin part of the metal molded product, and an inner surface of the molded part that forms a thick part of the metal molded product respectively, to so that is arranged in a shape is arranged gold correctly cooled for different metals Rutotomoni, several different multiple of the chill the same planar shape, previously prepared, model sand based on the image displayed the chiller arrangement of the above shape by placing the plurality of different chiller to form the sand mold, the production of the metal formed article using the sand mold that A method for producing a metal molded product characterized by The molding portion includes at least a first space and a second space having different sizes, and the first space is larger than the second space, and the first space and the second space. When the cooling metal is disposed on each of the inner surfaces of the first space, the first cooling metal is disposed on the inner surface of the first space, and the first cooling metal is disposed on the inner surface of the second space. So that the smaller second chillers are each correctly placed
2. The method for producing a metal molded product according to claim 1, wherein the sand mold is formed by arranging cooling metal having different sizes based on the image prepared in advance.   The method for manufacturing a metal molded product according to claim 1 or 2, wherein the cooling metal is arranged in accordance with a direction of the cooling metal shown in the image.   4. The method for manufacturing a metal molded product according to claim 3, wherein the cooling metal is provided with a notch that indicates a direction of arrangement.   The method of manufacturing a metal molded product according to any one of claims 1 to 4, wherein the plurality of cooling metals are arranged in accordance with a positional relationship of the cooling metals shown in the image.   The method for producing a metal molded product according to any one of claims 1 to 5, wherein the number of the cooling metals is arranged in accordance with the number of cooling metals shown in the image. The method for producing a metal molded product according to any one of claims 1 to 6, wherein aluminum or an aluminum alloy is cast by the sand mold. The inner surface position of the molding part for forming the metal molded product, the inner surface position of the molding part that forms the thin part of the metal molded product, and the molding part that forms the thick part of the metal molded product. A plurality of metal chills having different shapes corresponding to each of the inner surface positions are arranged on the sand model, and a plurality of the chills having different shapes are arranged on the same plane. An image characterized by being displayed.

Images