Riser insert

Abstract

To provide a riser insert that achieves both durability and exhaust performance.SOLUTION: A riser insert includes: an insert cavity 11b to be filled with molten metal; a main body part 11 made of a heat-insulating material having an opening 11c of the insert cavity 11b on an upper surface side; and a lid part 12 provided on an upper surface side of the main body part 11, having an exhaust port, and being at least partially made of iron, wherein the upper surface of the main body part 11 and a lower surface of the lid part 12 are joined by an adhesive 23. Thus, by combining the main body part 11 of the insert having high heat insulation with the iron lid 12 having an exhaust function, both durability and exhaust performance are achieved.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a feeder insert for a casting mold. [Background technology]

[0002] In casting equipment, when molten metal solidifies in a mold, the metal may shrink during solidification, resulting in insufficient metal within the product shape. Therefore, a feeder may be used to supplement the metal within the mold.

[0003] Patent Document 1 describes forming a feeder insert from a heat-insulating material with extremely low thermal conductivity. More specifically, in a gravity casting machine, improving the heat retention of the feeder section can prevent a decrease in the temperature of the molten metal in the feeder section, thereby preventing a decrease in the viscosity of the molten metal. As a result, in a gravity casting machine, the feeder section, which is located higher than the cavity in the mold, can be brought closer to the same height as the cavity. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 61-195731 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the gravity device described in Patent Document 1, the feeder insert does not have an exhaust function, and exhaust may not be possible depending on the orientation of the feeder insert, which means that the feeder insert cannot be filled with molten metal.

[0006] In addition, to add an exhaust mechanism, one method is to drill a hole in a feeder insert made of insulating material and install a sintering vent, but insulating materials have very low strength, so the insert may be damaged when replacing the vent, making vent replacement difficult. Furthermore, molten metal may enter the gap between the sintering vent and the insert, causing wear on the insert during demolding. Therefore, a feeder insert that combines durability and exhaust performance was desired.

[0007] The present disclosure provides a feeder insert that combines durability and evacuation properties. [Means for solving the problem]

[0008] The feeder insert according to the present disclosure comprises an insert cavity to be filled with molten metal, a main body made of a heat insulating material having an opening to the insert cavity on its upper surface, and a lid provided on the upper surface of the main body, having an exhaust port and at least a portion of which is made of iron, the upper surface of the main body and the lower surface of the lid being joined with an adhesive. This ensures durability and ventilation by combining the highly insulating body of the insert with the iron lid that has ventilation capabilities. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a feeder insert that combines durability and evacuation properties. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is an exploded perspective view of a feeder insert according to a first embodiment. [Figure 2] FIG. 1 is a cross-sectional view of a state in which the components of a feeder insert according to a first embodiment are assembled. [Figure 3] FIG. 10 is an exploded perspective view of a feeder insert according to a second embodiment. [Figure 4] FIG. 10 is a cross-sectional view of the feeder insert according to the second embodiment in a state where the components are assembled. [Figure 5]FIG. 10 is a cross-sectional view showing a related feeder insert in which the body and lid are not bonded with adhesive. DETAILED DESCRIPTION OF THE INVENTION

[0011] Embodiment 1 A feeder core 1 according to this embodiment will now be described with reference to the drawings. Typically, the feeder core 1 is used in a gravity casting device, where the feeder is used to supplement the metal in a mold. Fig. 1 is a perspective view showing each of the components of the feeder core 1, and Fig. 2 is a cross-sectional view of the components of the feeder core 1 assembled together.

[0012] As shown in FIGS. 1 and 2, the feeder core 1 comprises a main body 11 which is the main body of the feeder core, and a lid 12 arranged above the main body 11.

[0013] The main body 11 includes a wall 11a made of a heat-insulating material and a nested cavity 11b, which is a space into which molten metal is poured. Here, the main body 11 is cylindrical with an axis extending in the vertical direction, with the vertical ends serving as the bottom. The following description will be given assuming that the nested cavity 11b, which penetrates in the vertical direction, is formed in the radial center of the main body 11, and that the wall 11a is formed radially outward to surround the nested cavity 11b.

[0014] Here, since the nested cavity 11b is provided so as to penetrate the main body 11 in the vertical direction, the opening 11c of the nested cavity 11b is provided on the upper and lower surfaces of the main body 11. The position where the opening 11c is provided can be changed depending on the shape of the nested cavity 11b provided in the main body 11, but here it is assumed that the opening 11c of the nested cavity 11b is provided at least on the upper side of the main body 11.

[0015] The insert cavity 11b is formed with a larger diameter at the bottom than at the top, since the object is removed downward when the insert cavity 11b is released from the mold after being filled with molten metal.

[0016] The lid 12 has an exhaust port and is disposed so as to close the upper side of the main body 11. Specifically, the lid 12 includes a lid plate 21 disposed on the upper side, a doughnut-shaped plate 22 disposed between the lid plate 21 and the main body 11, and an adhesive 23 that bonds the lower surface of the doughnut-shaped plate 22 to the upper surface of the main body 11.

[0017] The cover plate 21 is a circular plate having the same diameter as the outer diameter of the main body 11 and is thin in the vertical direction. Any material may be used for the cover plate 21. For example, the material used for the cover plate 21 may be iron, similar to the donut-shaped plate 22 described below, or may be a material other than iron.

[0018] The doughnut-shaped plate 22 is formed with the same diameter as the outer diameters of the main body 11 and the cover plate 21, and has a doughnut shape that penetrates vertically on the radially inner side including the center. Here, the doughnut-shaped plate 22 will be described as having a through-hole 22b that penetrates vertically through the center of the flat portion 22a. The radial length of the through-hole 22b formed in the doughnut-shaped plate 22 is formed longer than the diameter of the opening 11c of the main body 11.

[0019] Typically, the doughnut-shaped plate 22 is thinner in the vertical direction than the cover plate 21. The doughnut-shaped plate 22 is made of iron.

[0020] Groove portions 22c extending radially inward and outward are formed on the upper surface of the flat portion 22a of the doughnut-shaped plate 22. For example, the groove portions 22c are formed at four locations spaced apart in the circumferential direction on the upper surface side of the flat portion 22a so as to be recessed downward, and are formed as grooves extending from the through holes 22b to the outer diameter.

[0021] The doughnut-shaped plate 22 is disposed so that its upper surface abuts against the lower surface of the cover plate 21. At this time, a groove portion 22c is formed in the upper surface of the flat portion 22a of the doughnut-shaped plate 22, and therefore an air path is formed between the doughnut-shaped plate 22 and the cover plate 21 by the groove portion 22c.

[0022] The adhesive 23 bonds the lower surface of the flat portion 22a of the doughnut-shaped plate 22 to the upper surface of the wall portion 11a of the main body 11. In particular, the adhesive 23 fills the gap between the flat portion 22a and the wall portion 11a so that molten metal does not enter between the lower surface of the flat portion 22a of the doughnut-shaped plate 22 and the upper surface of the wall portion 11a of the main body 11.

[0023] As a result, in the feeder insert 1, when the insert cavity 11b of the main body 11 is filled with molten metal, the molten metal does not enter between the main body 11 and the lid 12, i.e., no burrs enter. Therefore, damage to the feeder insert 1 by burrs can be prevented.

[0024] Furthermore, the lid 12 is made of iron, which has sufficient durability, and can be vented by providing grooves 22c in the doughnut-shaped plate 22. Therefore, the feeder core 1 can achieve both durability and venting properties.

[0025] Furthermore, in the feeder core 1, the wall 11a of the main body 11 is made of a heat-insulating material, so the temperature of the molten metal is less likely to drop. This makes it possible to prevent an increase in viscosity in the feeder core 1, and maintain an easy-to-flow state as a feeder.

[0026] Embodiment 2 Next, we will explain feeder core 2, which has a different configuration of the lid portion compared to feeder core 1. As the main body portion has the same configuration as main body portion 11 shown in embodiment 1, the same components are given the same reference numerals and their explanation will be omitted. Figure 3 is a perspective view showing each of the components of feeder core 2, and Figure 4 is a cross-sectional view of the components of feeder core 2 when assembled.

[0027] As shown in FIG. 3, the feeder insert 2 comprises a main body 11 which is the main body of the feeder insert, and a lid 13 arranged above the main body 11.

[0028] The lid portion 13 includes a cover plate main body 31, which is a substantially circular, vented iron cover plate, and an adhesive 32. As shown in Figures 3 and 4, the outer diameter of the cover plate main body 31 is formed to be substantially the same length as the outer diameter of the main body portion 11. The thickness of the cover plate main body 31 in the vertical direction is also formed to be thinner than that of the main body portion 11.

[0029] Typically, the cover plate main body 31 has a vent portion 31b formed to penetrate vertically in the radial center of the cover plate main body 31. The cover plate main body 31 also has a flat portion 31a, a vent portion 31b that penetrates vertically at the inner radial center of the flat portion 31a, an inner diameter wall portion 31c standing upward from the flat portion 31a to surround the vent portion 31b, and an outer diameter wall portion 31d standing upward from the flat portion 31a on the outer diameter.

[0030] The vent portion 31b is a sintered vent that is formed by penetrating the center of the cover plate main body 31 from top to bottom, with the upper part open to the atmosphere and the lower part open to the nested cavity 11b of the main body portion 11.

[0031] The adhesive 32 bonds the lower surface of the cover plate main body 31 of the cover portion 13 to the upper surface of the wall portion 11a of the main body portion 11. In particular, the adhesive 32 fills the gap between the lower surface of the cover plate main body 31 and the upper surface of the wall portion 11a of the main body portion 11 so that molten metal does not enter between them.

[0032] Here, Figures 5(a) and 5(b) show an example in which the cover plate main body 31 of the cover portion 13 and the upper surface of the wall portion 11a of the main body portion 11 are in contact without using adhesive 32, and Figure 5(a) shows the state in which the molten metal has been filled into the insert cavity 11b of the main body portion 11, and Figure 5(b) shows the state after demolding.

[0033] As shown in Figure 5(a), when adhesive 32 is not provided to seal the gap between the underside of the cover plate main body 31 of the cover portion 13 and the upper surface of the wall portion 11a of the main body portion 11, molten metal enters the gap between the underside of the cover plate main body 31 and the upper surface of the wall portion 11a from the inner diameter side, which is the side of the insert cavity 11b, resulting in the intrusion of burrs.

[0034] 5(b), the mold release is performed in a state where a burr is formed in the gap between the lower surface of the cover plate main body 31 and the upper surface of the wall portion 11a. At this time, the mold release is performed in a state where the burr is in contact with the upper end portion of the wall portion 11a on the inner diameter side of the main body 11.

[0035] Therefore, near the upper end portion of the wall portion 11a of the main body portion 11 on the inner diameter side, burrs are likely to damage the wall portion 11a.

[0036] 4, when adhesive is provided to seal the gap between the lower surface of the cover plate main body 31 of the cover portion 13 and the upper surface of the wall portion 11a of the main body portion 11, the molten metal does not enter the gap between the lower surface of the cover plate main body 31 and the upper surface of the wall portion 11a, i.e., burrs do not enter. Therefore, damage to the upper end portion of the wall portion 11a on the inner diameter side of the main body portion 11 due to burrs can be suppressed.

[0037] As a result, in the feeder insert 2, when the insert cavity 11b of the main body 11 is filled with molten metal, the molten metal does not enter between the main body 11 and the lid 13, i.e., no burrs enter. Therefore, damage to the feeder insert by burrs can be prevented.

[0038] The lid 13 is made of iron, which has sufficient durability, and is provided with a vent 31b to allow ventilation. Therefore, the feeder core 2 can achieve both durability and ventilation properties.

[0039] Furthermore, in the feeder core 2, the wall portion 11a of the main body 11 is made of a heat-insulating material, so the temperature of the molten metal is less likely to drop. This makes it possible to prevent an increase in viscosity in the feeder core 2, and maintain an easy-to-flow state as a feeder.

[0040] The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention. In other words, the above description has been omitted or simplified as appropriate for the sake of clarity, and a person skilled in the art can easily modify, add, or convert each element of the embodiment within the scope of the present invention.

[0041] In the first embodiment, the doughnut-shaped plate 22 is described as being made of iron, but the present invention is not limited to this and other materials having sufficient durability can be used.

[0042] Furthermore, in the first and second embodiments, the exhaust method is described as using the groove portion 22c and the vent portion 31b, but the exhaust method is not limited to these and can be changed as desired. [Explanation of symbols]

[0043] 1 Oshiyu Iriko 2 Oshiyu Iriko 11 Main body 11a Wall 11b Nested cavity 11c aperture 12 Lid 21 Lid plate 22 Donut-shaped plate 22a Flat part 22b Through hole 22c Groove 23 Adhesive 13 Lid 31 Lid plate body 31a Flat part 31b Vent section 31c Inner diameter wall 31d Outer diameter wall 32 Adhesive

Claims

1. a cavity to be filled with molten metal; and a main body made of a heat insulating material having an opening for the cavity on an upper surface side; a lid portion provided on an upper surface side of the main body portion, having an exhaust port, and at least a portion of which is made of iron; The upper surface of the main body and the lower surface of the lid are joined by an adhesive. Oshiyu niko.

2. The lid portion is A plate-shaped cover plate; a donut-shaped plate that is disposed between the cover plate and the main body portion and is a hollow donut-shaped plate, an upper plate surface of the doughnut-shaped plate has at least one groove portion extending inward and outward as the exhaust port; The lower plate surface of the doughnut-shaped plate and the upper surface of the main body are bonded together with an adhesive.

2. The feeder insert according to claim 1.

3. The donut-shaped plate is made of iron.

3. The feeder insert according to claim 2.

4. The lid portion is A plate-shaped iron vented cover plate having a sintered vent penetrating in the vertical direction.

2. The feeder insert according to claim 1.

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