Casting system with mold inversion function

Abstract

The present technology relates to a casting system having a mold inversion function that improves product reliability by preventing distortion during the process of inverting multiple molds having a stacked structure, and prevents product defects caused by uneven cooling due to uneven gas discharge during the molding process. More specifically, the system comprises a mold part formed by cooling molten metal and molding a product, which is composed of a permeable molding sand mixture capable of gas discharge; an insert member formed by a permeable molding sand mixture capable of gas discharge and mounted interchangeably with the mold part based on product information regarding the product to be molded; and an inversion member that assists in inverting the mold part by having one side detachably coupled to a hoist and the other side detachably coupled to the mold part, wherein the insert member is characterized by having a greater amount of gas discharge compared to the mold part.

Description

Technology Field

[0001] The present invention relates to a casting system having a mold inversion function that improves product reliability by preventing distortion during the process of inverting multiple molds having a stacked structure, and prevents product defects caused by uneven cooling due to uneven gas discharge during the molding process. Background Technology

[0002] Generally, conventional sand casting involves creating a mold by pouring a mixture of organic binders called resin into a mold, and then casting with molten metal. This process for sand casting molds is simple and has the advantage of relatively low production costs, so it is widely used in the casting industry.

[0003] In the case of the conventional sand casting method described above, a product is formed using a mold and a sand mold provided to surround the mold in order to prevent the mold and the shape of the mold from changing, and during the process of forming the product, the mold and the sand mold are inverted at least once as needed while forming the product.

[0004] To do this, as shown in FIG. 9, a wire rope (102) is attached to a ring (101) formed on the outer surface of a diaphragm as a means for reversing the mold, a crossbar (103) is attached to the wire rope (102), and a hook (104) of a hoist is attached to the crossbar (103) to lift it, after which the operator reverses the mold and the mold (100) 180°.

[0005] However, conventional inversion means employ a method of individually attaching the bolts to the wire rope to connect multiple bolts to the wire rope, which causes distortion of the die with a stacked structure during the process of lifting with a hook or performing inversion, resulting in product defects.

[0006] Meanwhile, in the case of conventional sand casting methods, problems such as porosity and shrinkage cavities exist, and due to the aforementioned problems, a phenomenon of insufficient internal gas discharge occurs in which gas generated during the process of the product hardening inside the mold cannot escape to the outside, or an unbalanced cooling phenomenon occurs in which empty spaces are created as the product shrinks and bubbles are trapped inside.

[0007] Accordingly, conventionally, ventilation holes were uniformly applied to the entire sand casting to facilitate gas release, but since each product to be manufactured has different shapes and conditions, uniform ventilation holes alone could not solve the conventional problems.

[0008] In other words, there is a problem where the quality of the product is lowered because ventilation holes are uniformly formed in areas where a relatively large amount of gas is generated and areas where it is not during the manufacturing process.

[0009] Therefore, in recent years, in order to solve the problems of the aforementioned conventional technology, at least one gas exhaust vent has been additionally provided in the sand mold to increase the gas discharge capability in the area where a large amount of gas is generated, thereby attempting to solve the aforementioned problems.

[0010] However, the aforementioned conventional gas exhaust vent is manufactured as a single unit through a mold, which not only increases the cost associated with mold production but also makes it difficult to manufacture gas exhaust ports of various specifications. Furthermore, due to the cylindrical shape of the body, the bonding strength with the mounting hole formed in the upper mold is very low, frequently causing the body to detach simultaneously upon minor impact or during the ejection of the molded product. Additionally, because multiple through holes are formed along the internal longitudinal direction of the body, it is impossible to change the shape of the gas exhaust port, making it impossible to accommodate various shapes of casting molds. Moreover, there was a problem where the through holes became clogged by foreign substances after prolonged use. Prior art literature

[0011] Republic of Korea Published Patent No. 1998-48299 (Publication Date: Sep. 15, 1998) Republic of Korea Registered Patent No. 237764 (Registration Date: Oct. 11, 1999) Republic of Korea Published Patent No. 2011-97326 (Publication Date: Aug. 31, 2011) Republic of Korea Registered Patent No. 1840273 (Registration Date: Mar. 14, 2018) Republic of Korea Registered Patent No. 2041073 (Registration Date: Oct. 30, 2019) The problem to be solved

[0012] To solve the aforementioned conventional problems, the present invention aims to improve product reliability by providing a reversal means that prevents distortion of the molds during the process of reversing a plurality of molds.

[0013] In addition, another objective of the present invention is to ensure that gas is discharged uniformly in response to the gas generation concentration area where gas generation is concentrated for the product, when manufacturing a mold consisting of an upper mold and a lower mold based on the confirmed product information, while checking product information in advance. means of solving the problem

[0014] As a means of solving the problem of the aforementioned conventional problems, the casting system having a mold inversion function according to the present invention comprises a mold part (100) that forms a product (10) by cooling a molten metal and is made of a molding sand mixture that is permeable and capable of releasing gas, an insert member (200) that is made of a molding sand mixture that is permeable and capable of releasing gas and is interchangeably mounted with the mold part (100) based on product information regarding the product (10) to be formed, and an inversion member (300) that is detachably coupled to a hoist (340) on one side and detachably coupled to the mold part (100) on the other side to help the mold part (100) invert, wherein the insert member (200) is characterized by having a greater amount of gas released compared to the mold part (100).

[0015] Additionally, the above-mentioned inversion member (300) comprises a support body (310) having grooves (315) formed on both sides based on a partition wall (311) having a length in the vertical direction, and a ring (317) formed on one side that is connected to a hoist (340); a pressure plate (320) formed in the shape of a plate and provided in the groove (315), which presses the mold part (100) seated on the support body (310) by being inserted through so as to move along the partition wall (311); and a lifting bolt (330) that is screw-coupled so as to raise and lower the pressure plate (320) according to the rotational direction. It is preferable that the groove (315) includes a first groove (315a) in which the ring (317) is arranged, and a second groove (315b) into which the mold part (100) is inserted so as to be pressed or released by the pressure plate (320).

[0016] Additionally, the mold part (100) comprises an upper mold member (110) having an upper space (113) formed therein for molding a product (10) by the injected molten metal, and a lower mold member (120) having a lower space (123) formed therein for molding a product (10) by the injected molten metal and capable of being separated and coupled with the lower part of the upper mold member (110). The insertion member (200) is provided in a shape-matched manner to an insertion space (S) formed in at least one of the upper mold member (110) or the lower mold member (120), and the upper mold member (110) and the lower mold member (120) form a stacked structure so that they can be collectively pressed or released by the inversion member (300).

[0017] Additionally, the upper mold member (110) comprises an upper mold body (111) having a molten metal injection hole (115) formed on its upper surface that communicates with an upper space (113), and an upper mold frame (117) installed on the outer surface of the upper mold body (111) to maintain the shape of the upper mold body (111), with an upper gripping projection (119) formed on its outer surface to be gripped by the inversion member (300); wherein the lower mold member (120) comprises a lower mold body (121) having a lower space (123) formed on its upper surface, and a lower mold frame (125) installed on the outer surface of the lower mold body (121) to maintain the shape of the lower mold body (121), with a lower gripping projection (127) formed on its outer surface to be gripped by the inversion member (300) together with the upper gripping projection (119). It is preferable that a plurality of through holes (20) are formed on the outer surface facing the insertion space (S) so that gas can be discharged to the outside through the upper mold (117) and the lower mold (125), respectively, through the upper mold body (111), the lower mold body (121), and the insertion member (200).

[0018] Additionally, the above-mentioned through holes (20) are formed in a greater number in the second discharge area (Z2) communicating with the insertion member (200) compared to the first discharge area (Z1) communicating with the upper body (111) or the lower body (121), and it is preferable that the first discharge area (Z1) and the second discharge area (Z2) be divided based on product information regarding the product (10).

[0019] In addition, the molding sand mixture for forming the upper mold member (110), the lower mold member (120), and the insert member (200) is composed of a mixture of silica sand, sawdust, porous coke made from coal, and bentonite, which is one of the clay minerals, and it is preferable to form the insert member (200) by increasing the mixing weight of coke and decreasing the mixing weight of bentonite to improve air permeability with the upper mold member (110) or the lower mold member (120). Effects of the invention

[0020] According to the present invention, a mold part composed of an upper mold member and a lower mold member forming a stacked structure, distinct from the conventional method, is clamped by an inversion member so that no misalignment occurs between them, thereby providing the effect of being easily inverted.

[0021] In addition, unlike conventional methods, an insertion space is formed in which an insert member with improved breathability is replaceably inserted at the location of an upper or lower member corresponding to a gas generation concentration zone based on product information of the product to be molded, thereby enabling uniform gas release to the outside of the mold, which has the effect of reducing the molding defect rate of the product. Brief explanation of the drawing

[0022] FIG. 1 is a drawing illustrating a casting system having a mold inversion function according to the present invention. FIG. 2 is a cross-sectional view illustrating a mold portion equipped with an insertion member according to FIG. 1. FIG. 3 is an exploded cross-sectional view of the shape member of FIG. 2. FIG. 4 is an enlarged cross-sectional view of the key part of the mold for FIG. 3. FIG. 5 is a drawing illustrating a product formed through FIG. 2. FIG. 6 is a drawing illustrating an inversion member for FIG. 1. FIGS. 7 and FIGS. 8 are diagrams of the operational relationship of the inversion member for FIGS. 6. FIG. 9 is a drawing illustrating an inversion means used in a conventional sand casting method. Specific details for implementing the invention

[0023] The present invention is capable of various modifications and may take various forms, and embodiments are to be described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0024] Hereinafter, a casting system having a mold inversion function according to the present invention (hereinafter briefly referred to as the "casting system") will be described in detail with reference to the attached drawings.

[0025] Before proceeding with the explanation, please note that the shape of the product (10) described and illustrated below is an example intended to clearly convey the gist of the invention and is not limited thereto.

[0026] In addition, the mold part (100) according to the present invention described below is illustrated such that an insertion member (200) is inserted into an upper mold body (111), and correspondingly, first and second discharge areas (Z1, Z2) are formed in a through hole (20) formed in the upper mold (117). However, this is merely one embodiment, and it should be noted that, if necessary, an insertion space part (S) into which the insertion member (200) is inserted may also be formed in the lower mold body (121), and through this, the first and second discharge areas (Z1, Z2) may also be formed in the lower mold (125).

[0027] First, as illustrated in FIG. 1, the casting system (1) according to the present invention largely comprises a mold part (100), an insertion member (200), and an inversion member (300).

[0028] To explain in more detail, the mold part (100) includes an upper mold member (110) and a lower mold member (120) configured to cool the high-temperature molten metal introduced as shown in FIGS. 2 to 4, and to allow the gas generated during the cooling process to be uniformly discharged outside the mold part (100) regardless of the shape of the product (10).

[0029] For example, the upper mold member (110) includes an upper mold body (111) and an upper mold frame (117) configured to mold the product (10) together with the lower mold member (120) described later, and to allow the gas generated during molding to be released to the outside.

[0030] The upper body (111) can be molded to have a cuboid shape with breathability using molding sand as a material in the example, and an upper space (113) is formed in the lower part that communicates with the lower space (123) described later.

[0031] A molten metal injection hole (115) for injecting molten metal is formed on the upper surface of the upper body (111), and the molten metal injection hole (115) is formed to communicate with the upper space (113).

[0032] Accordingly, the high-temperature molten metal supplied through the molten metal injection port (115) is injected together into the upper space (113) and the lower space (123), enabling the molding of the product (10).

[0033] On the outer surface of the upper body (111), at least one insertion space (S) may be formed for inserting an insertion member (200) described later in a shape-matched manner, and the position of the insertion space (S) is determined based on product information in the form of data regarding the product (10) to be molded through the casting system (1) according to the present invention.

[0034] That is, after checking product information for a gas generation concentration zone (11) corresponding to the shape of a product (10) having different shapes or sizes in advance, and when drawing data for the product (10) is created through an administrator terminal, etc., during the process of molding the upper body (111) through casting sand, an insertion space (S) is formed at at least one location of the upper body (111) corresponding to the gas generation concentration zone (11), and an upper mold (117) for wrapping the outer surface of the upper body (111) is each manufactured (see FIG. 5).

[0035] At this time, during the process of manufacturing the mold (117), it is preferable for the manufacturer to identify a first or second discharge area (Z1, Z2) on the outer surface of the mold (117) facing the insertion space (S) where the placement has been confirmed, and then form a through hole (20) corresponding thereto.

[0036] Here, the gas generation concentration zone (11) may include corner and edge portions according to the shape of the product (10), as well as a groove-shaped portion having a predetermined depth in the product (10), although not illustrated.

[0037] To elaborate, the part where gas is trapped and difficult to release to the outside during the molding process of the product (10) can be interpreted as a gas generation concentration zone (11).

[0038] The mold (117) can be formed using wood and a metal material that is highly durable against high temperatures, and as illustrated, it is formed to have the shape of a mold that encloses multiple side portions of the mold body (111), excluding the upper and lower surfaces of the mold body (111).

[0039] At this time, it is preferable that a plurality of through holes (20) be formed on the outer surface of the mold (117) so that gas generated during the process of molding the product (10) can be uniformly discharged through the mold body (111) which has breathability, as well as through the insertion member (200) inserted into the insertion space (S).

[0040] Here, the through holes (20) are formed such that, as illustrated, a larger number of holes can be formed in the second discharge area (Z2) facing the insert member (200) described later, in contrast to the first discharge area (Z1) facing the upper body (111) or the lower body (121), thereby inducing that even if a relatively large amount of gas is generated in the gas generation concentration area (11) of the product (10), the gas discharge to the outside of the mold part (100) can be uniformly induced through the insert member (200) with improved air permeability.

[0041] In addition, the outer surface of the upper mold (117) in the present invention includes an upper gripping projection (119) for clamping or unclamping the mold part (100) itself by means of an inversion member (300) described later (see FIG. 7).

[0042] As shown in the illustration, the upper gripping projection (119) is formed in multiple numbers to have a shape protruding from the lower side of the upper mold (117) so as to be able to face and interact with the lower gripping projection (127) described later.

[0043] Additionally, the lower member (120) includes a lower body (121) that corresponds to the upper member (110) described above, and a lower frame (125) that corresponds to the upper frame (117).

[0044] That is, the lower body (121) is formed by casting sand to have the same cuboidal shape as the upper body (111), and the lower mold (125) is formed in the shape of a mold that encloses a plurality of side parts, excluding the upper and lower surfaces of the lower body (121), so that the shape of the lower body (121) is not deformed by the high temperature of the molten metal, just like the upper mold (117).

[0045] However, unlike the upper body (111) in the present invention, the lower body (121) has a lower space (123) formed on its upper surface that communicates with the upper space (113), so that the shape of the product (10) can be realized through the connection of the upper space (113) and the lower space (123).

[0046] In addition, the lower mold (125) in the present invention further includes a lower gripping projection (127) that corresponds to the upper gripping projection (119) described above, and unlike the upper gripping projection (119), the lower gripping projection (127) is formed to protrude in a plurality of configurations so as to be in contact with the upper gripping projection (119) on the upper side of the lower mold (125).

[0047] Accordingly, the upper gripping projection (119) and the lower gripping projection (127) overlap and come into contact with each other through the inversion member (300) described later, and the entire mold part (100) is pressed and fixed through the clamping (grip) of the inversion member (300), thereby achieving inversion.

[0048] Meanwhile, the molding sand mixture used to mold the upper body (111) and the lower body (121) in the present invention can be formed by mixing silica sand, sawdust, porous coke made from coal, and bentonite, which is one of the clay minerals, and the insert member (200) described later also has breathability as it is molded using the same material.

[0049] At this time, it is preferable that the insert member (200) be molded with a different ratio of coke and bentonite among the mixed materials compared to the upper body (111) or the lower body (121) so that the air permeability is further improved.

[0050] To this end, the upper body (111) and the lower body (121) are mixed with 13 to 17 parts by weight of sawdust, 8 to 12 parts by weight of coke, and 5 to 9 parts by weight of bentonite per 100 parts by weight of silica sand, whereas the insert member (200) is molded by mixing 13 to 17 parts by weight of sawdust, 15 to 19 parts by weight of coke, and 2 to 4 parts by weight of bentonite per 100 parts by weight of silica sand so that the air permeability can be further improved compared to the upper body (111) or the lower body (121).

[0051] That is, in the case of the insert member (200), the mixing weight of coke beneficial for porosity is increased, while the mixing weight of bentonite, which absorbs moisture and has high volume variability, is reduced so that the insert member (200) can have better air permeability than the upper body (111) or the lower body (121).

[0052] In addition, the insertion member (200) is configured to be inserted in a shape-matched manner with the insertion space (S) formed in the upper body (111) or lower body (121) described above, so that gas generated during the molding of the product (10) can be released to the outside.

[0053] For example, the insert member (200) is formed using a molding sand mixture to have a block shape for ease of installation as well as maintenance, as described above, and is formed to have better air permeability compared to the upper body (111) or the lower body (121).

[0054] At this time, although the insertion member (200) is not illustrated, it is preferable to further form a ring portion (not illustrated) so that the worker can easily withdraw and insert the insertion member (200) by considering the size of the insertion member (200) and the temperature rise of the molten metal.

[0055] And, as shown in FIGS. 6 to 7, the inversion member (300) is configured to invert the mold part (100) described above by clamping it so that no twisting occurs, and includes a support body (310), a pressure plate (320), and a lifting bolt (330).

[0056] For example, as illustrated, the support body (310) is connected to the hoist (340) and wire, etc., and includes a partition (311), a groove (315), and a ring (317) so that the upper gripping projection (119) and the lower gripping projection (127) constituting the mold part (100) are inserted and clamping or unclamping can be performed by the pressure plate (320).

[0057] As shown in the illustration, the bulkhead (311) has a structure that protrudes upward from the upper surface of the support body (310), and its upper portion is bent so that a lifting bolt (330) can pass through and be screw-coupled with the pressure plate (320).

[0058] At this time, a lifting hole (313) is formed on the outer surface of the bulkhead (311) in the longitudinal direction for a pressure plate (320) to pass through, and it is preferable that one side of the outer surface be extended to be connected to a ring (317) so as to be connected to a hoist (340).

[0059] The groove (315) is divided into a first groove (315a) on one side and a second groove (315b) on the other side based on the partition wall (311) described above.

[0060] Here, a ring (317) is formed in the first groove (315a) so that the pressure plate (320) and the lifting bolt (330) can be fastened to each other, and in the second groove (315b) on the other side, an upper gripping projection (119) and a lower gripping projection (127) are inserted between the lower surface of the pressure plate (320) and the outer surface of the support body (310) so that clamping and unclamping of the mold part (100) can be achieved through the lifting of the pressure plate (320).

[0061] Meanwhile, in the present invention, the ring (317) formed on the partition wall (311) may be connected to one another through a bearing or the like as needed, so that the mold part (100) can be easily inverted without the operator applying excessive external force during the process of inverting the mold part (100).

[0062] Additionally, as shown in the illustration, the pressure plate (320) is formed in the shape of a plate overall, and one side is configured to be screw-coupled with a lifting bolt (330) in the first groove (315a) through the lifting hole (313), while the other side press-fixes the mold part (100) together with the support body (310).

[0063] At this time, although not shown, it is preferable to provide a plurality of protrusions (not shown) on the lower surface of the pressure plate (320) in contact with the mold part (100) so as to improve the fixing force of the mold part (100).

[0064] Additionally, as illustrated, the lifting bolt (330) is inserted through the first groove (315a) so as to be screw-coupled with one side of the pressure plate (320) so as to penetrate the upper part of the bent partition (311).

[0065] The upper head portion of the lifting bolt (330) is structured to be rotatable in both directions by means of a motor (not shown), etc., and the pressure plate (320) is raised or lowered according to the direction of rotation so that clamping or unclamping of the mold portion (100) can be achieved.

[0066] As described above, the casting system (1) according to the present invention has the effect of easily inverting the mold part (100), which is composed of an upper mold member (110) and a lower mold member (120) forming a stacked structure distinct from the conventional method, by clamping them with an inversion member (300) so that they do not become misaligned with each other.

[0067] In addition, by forming an insertion space (S) in which an insertion member (200) with improved breathability is replaceably inserted at the location of an upper mold member (110) or a lower mold member (120) corresponding to a gas generation concentration zone (11) based on product information for a product (10) to be molded differently from conventional methods, gas can be uniformly released outside the mold part (100), thereby having the effect of reducing the molding defect rate of the product (10).

[0068] As described above, the present invention has been explained by specific details such as specific components, limited embodiments, and drawings; however, this is provided merely to aid in a more comprehensive understanding of the invention, and the invention is not limited to the above embodiments. A person skilled in the art can make various modifications and variations from this description.

[0069] Accordingly, the scope of the present invention should not be limited to the described embodiments, and all things equivalent to or having equivalent variations to the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept of the present invention. Explanation of the symbols

[0070] 1: Casting system having a mold inversion function according to the present invention 100: Mold part 110: Figurative member 111: Figurative body 113: Upper space 115: Molten metal injection port 117: Mold 119: Upper gripping projection 120: Lower die member 121: Lower die body 123: Lower space section 125: Lower mold 127: Lower gripping projection 200: Insertion member 300: Absence of inversion 310: Support body 311: Bulkhead 313: Elevator 315: Home 317: Ring 320: Pressure plate 33: Lifting bolt 340: Hoist 10: Product 11: Gas generation concentration zone 20: Communion S: Insertion space Z1: First emission zone Z2: Second emission zone

Claims

Claim 1 A molding part (100) formed by cooling a molten metal and composed of a molding sand mixture capable of releasing gas and capable of releasing gas; an insertion member (200) formed by a molding sand mixture capable of releasing gas and inserted into an insertion space (S) formed in the molding part (100) based on product information for the product (10) to be molded; and a reversing member (300) that clamps the molding part (100) to reverse it so that no twisting occurs; wherein the insertion member (200) is configured to have a greater amount of gas released compared to the molding part (100), and the reversing member (300) comprises a support body (310) having grooves (315) formed on both sides based on a partition wall (311) having a length in the vertical direction, and a ring (317) formed on one side that is connected to a hoist (340). A casting system having a reversal function of a mold, comprising: a pressure plate (320) formed into the shape of a plate and provided in a groove (315), which presses the mold part (100) seated on a support body (310) by being inserted through so as to move along a partition wall (311); and a lifting bolt (330) which is screw-coupled so as to raise and lower the pressure plate (320) according to the rotational direction; wherein the groove (315) includes a first groove (315a) in which a ring (317) is arranged and a second groove (315b) into which the mold part (100) is inserted so as to be pressed or released by the pressure plate (320). Claim 2 delete Claim 3 A casting system having a reversal function of a mold, wherein the mold part (100) comprises: an upper mold member (110) having an upper space part (113) formed therein for molding a product (10) by the molten metal introduced therein; and a lower mold member (120) having a lower space part (123) formed therein in communication with the upper space part (113) for molding a product (10) by the molten metal introduced therein, and configured to be separably coupled with the lower part of the upper mold member (110); wherein the insertion member (200) is configured to fit the shape of an insertion space part (S) formed in at least one of the upper mold member (110) or the lower mold member (120), and the upper mold member (110) and the lower mold member (120) form a stacked structure with each other so that they can be collectively pressed or released by the reversal member (300). Claim 4 In paragraph 3, the upper mold member (110) comprises: an upper mold body (111) having a molten metal injection hole (115) formed on its upper surface that communicates with an upper space (113); and an upper mold frame (117) installed on the outer surface of the upper mold body (111) to maintain the shape of the upper mold body (111), having an upper gripping projection (119) formed on its outer surface to be gripped by the inversion member (300); wherein the lower mold member (120) comprises a lower mold body (121) having a lower space (123) formed on its upper surface; A casting system having a reversal function of a mold, comprising: a lower mold (125) installed on the outer surface of the lower mold body (121) to maintain the shape of the lower mold body (121), and having a lower gripping projection (127) formed on the outer surface to be gripped by the reversal member (300) together with an upper gripping projection (119); wherein the upper mold (117) and the lower mold (125) each have a plurality of through holes (20) formed on the outer surface facing the insertion space (S) so that gas can be discharged to the outside through the upper mold body (111), the lower mold body (121), and the insertion member (200). Claim 5 A casting system having a mold inversion function, characterized in that, in paragraph 4, the through holes (20) are formed in a greater number in the second discharge area (Z2) communicating with the insertion member (200) compared to the first discharge area (Z1) communicating with the upper body (111) or the lower body (121), and the first discharge area (Z1) and the second discharge area (Z2) are divided based on product information regarding the product (10).

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