Casting mold for resin sand casting and casting process thereof

Abstract

The mold comprises a sand mixing cylinder, conveying equipment, a grinding mechanism and a jacking mechanism, a storage box is arranged in the sand mixing cylinder, the inner wall of the sand mixing cylinder is divided into an upper end and a lower end by the storage box, the upper end of the sand mixing cylinder is used for storing unground resin sand, and the lower end of the sand mixing cylinder is used for storing ground resin sand; according to the resin sand grinding device, the motor drives the connecting shaft to rotate, so that caked or non-caked resin sand is poked into the material leaking groove and matched with the upper grinding plate and the lower grinding plate, the caked resin sand is minced, when the caked resin sand passes through the material leaking groove, the caked resin sand can be ground, and the resin sand can be conveyed into the sand mixing cylinder through the material leaking groove. The top ball on the deflector rod drives the connecting ball to enable the lever to rotate along the connecting sleeve, so that the pressing block descends, caked resin sand is pressed into the material leaking groove, crushing and material leaking can be achieved only through one power device, and grinding is more thorough.

Description

Technical Field

[0001] The invention relates to the technical field of casting equipment, in particular to a casting mold for resin sand casting and a casting process thereof. Background Art

[0002] Resin sand casting is to mix raw sand and resin to form resin sand, drive the resin sand into the mold cavity, and shape it by heating or catalyst method. The formed mud core is then placed in the casting mold for casting. The resin sand needs to be compacted when it is used, and the resin sand needs to be scattered again after use. The relevant Chinese patent with announcement number CN113198972B discloses a resin sand casting mold and casting process, which includes a frame and a sand mixing box, a stirring mechanism is provided in the sand mixing box, a discharge port is opened at the lower end of the sand mixing box, a discharge pipe is provided at the discharge port, a discharge mechanism opposite to the discharge port is provided below the discharge pipe, and the discharge mechanism includes a mounting seat, a feeding cylinder is provided at the upper end of the mounting seat, a feeding port opposite to the discharge port is opened at the upper end of the feeding cylinder, the feeding cylinder is rotatably connected to the mounting seat, and a feeding auger is provided in the feeding cylinder; According to the above documents, the inventor believes that: 1. When the resin sand is mixed, the internal stirring paddle 24 is used for stirring, but the effect is not obvious. If the resin sand clumps, it is not easy to stir and break it; 2. The agglomerated resin sand is not easy to enter the feeding auger for transportation, and will be stuck at the discharge port below the sand mixing cylinder.

[0003] For this reason, we propose a resin sand casting mold and a casting process thereof. Summary of the invention

[0004] The object of the present invention is to provide a resin sand casting mold and a casting process thereof to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a casting mold for resin sand casting, comprising: a sand mixing cylinder, a conveying device, a grinding mechanism and a top pressing mechanism, a storage box is provided inside the sand mixing cylinder, the inner wall of the sand mixing cylinder is divided into an upper end and a lower end by the storage box, the upper end of the sand mixing cylinder is used to store unground resin sand, and the lower end of the sand mixing cylinder is used to store ground resin sand, the top and bottom ends of the sand mixing cylinder are connected to the conveying device, the conveying device is an auger, a grinding mechanism is installed on the storage box, a top pressing mechanism is installed in the storage box, and the top pressing mechanism is installed in coordination with the grinding mechanism.

[0006] Preferably, the grinding mechanism includes: an upper grinding plate, the bottom end of the storage box is fixedly connected to the upper grinding plate, the top end of the sand mixing cylinder is fixedly connected to a motor, the output end of the motor extends into the sand mixing cylinder and is fixedly connected to a connecting shaft, the connecting shaft is rotatably connected to the storage box and the upper grinding plate, the bottom end of the connecting shaft is fixedly connected to a lower grinding plate, a material leakage groove is provided inside the storage box and the upper grinding plate, one end of the connecting shaft is fixedly connected to a lever, one end of the lever is fixedly connected to an arc block, the connecting shaft is driven to rotate by the motor, so that the lever drives the arc block to rotate along the storage box, thereby pushing the resin sand in the storage box into the leakage groove, and the lower grinding plate is driven by the rotation of the connecting shaft, so that the upper grinding plate and the lower grinding plate rub against each other, and the originally agglomerated resin sand is crushed again.

[0007] Preferably, the pressing mechanism comprises: an extension rod, an extension rod is fixedly connected to the inner wall of the storage box, one end of the extension rod is slidably connected to a sliding rod, the bottom end of the sliding rod is fixedly connected to a pressure block, the outer wall of the sliding rod is sleeved with a spring, the top end of the spring is fixedly connected to the bottom end of the extension rod, the bottom end of the spring is fixedly connected to the top end of the pressure block, and the pressure block coincides with the leakage groove in the vertical direction, the storage box is fixedly connected with a connecting sleeve at the center of the circle, the connecting sleeve is rotatably connected to the connecting shaft, one side of the connecting sleeve is rotatably connected to a lever, one end of the lever is provided with a travel groove, one end of the sliding rod is fixedly connected to a connecting column, the connecting column is slidably connected to the inner wall of the travel groove, the other end of the lever is fixedly connected to a connecting ball, one end of the shift rod is fixedly connected to a top ball, and the connecting shaft drives the shift rod to rotate, so that the shift rod and the arc block shift the agglomerated resin sand into the leakage groove for the upper grinding plate and the lower grinding plate to grind the agglomerated resin sand into pieces, and then for use in the next casting mold.

[0008] Preferably, brackets are fixedly connected to the outer wall of the sand mixing cylinder at equal intervals.

[0009] Preferably, the diameter of the upper grinding plate is larger than the diameter of the lower grinding plate.

[0010] Preferably, the motor is a reduction motor.

[0011] Preferably, a telescopic rubber sleeve is fixedly connected between the extension rod and the pressing block.

[0012] To achieve the above object, the present invention also provides the following technical solutions: A resin sand casting process: S1, sand mixing stage, preparing molding sand and core sand for molding, using a sand mixer to put in old sand and a proper amount of clay for stirring, conveying the old resin sand to the inside of the sand mixing barrel through the conveying device at the top of the sand mixing barrel, and injecting clay into the conveying device, the mixture of resin sand and clay falls into the storage box, then starting the motor, driving the lever and the arc block to rotate along the storage box through the connecting shaft, and dialing the mixture into the leakage trough, and then driving the lower grinding plate to rotate through the connecting shaft, so that the upper grinding plate and the lower grinding plate rub against each other, so as to crush and mix the mixture, when the connecting shaft rotates, it drives the top ball to rotate, when the top ball and the connecting ball squeeze each other, the connecting ball drives the lever to rotate along the connecting sleeve, so that the travel groove at one end of the lever and the connecting column slide, and drives the pressing block to press downward, thereby stretching the spring, pressing the agglomerated resin sand into the leakage trough, and the upper grinding plate and the lower grinding plate are crushed; S2, mold making stage, make molds and core boxes according to part drawings. Generally, wooden molds can be used for single parts, plastic molds or metal molds (commonly known as iron molds or steel molds) can be made for mass production, and templates can be made for large-scale castings; S3, modeling stage, using molding sand to form the casting cavity, forming the internal shape of the casting, placing the mold into the cavity, and closing the upper and lower sand boxes. Modeling is the key link in casting; S4, smelting stage, prepare the chemical composition according to the required metal composition, select a suitable melting furnace to melt the alloy material, and form qualified liquid metal (including qualified composition and qualified temperature). Smelting generally uses a cupola or electric furnace (due to environmental protection requirements, cupolas are now basically banned, and electric furnaces are basically used); S5, pouring stage, use the ladle to pour the molten iron in the electric furnace into the mold. When pouring the molten iron, you need to pay attention to the pouring speed so that the molten iron fills the entire cavity. Both smelting and pouring require professionally trained technicians to operate, and professional work clothes must be worn during the operation. In addition, pouring molten iron is dangerous and safety must be paid attention to; S6, cleaning stage, after pouring, wait for the molten metal solution to cool and solidify, use a hammer to remove the gate and shake off the resin sand on the surface of the casting, then use a shot blasting machine or sand blasting machine to sandblast the surface of the casting, so that the surface of the casting will appear very clean. For some castings with special requirements or some castings that cannot meet the requirements, simple processing may be required, generally using a grinding wheel or grinder for processing and grinding to remove burrs and make the casting smoother.

[0013] Compared with the prior art, the present invention has the following beneficial effects: When the present invention is in use, the motor drives the connecting shaft to rotate, thereby pushing the agglomerated or unclumped resin sand into the leakage trough, and cooperates with the upper grinding plate and the lower grinding plate to grind the agglomerated resin sand. When the agglomerated resin sand passes through the leakage trough, the top ball on the shifting rod drives the connecting ball to make the lever rotate along the connecting sleeve, thereby making the pressing block descend and pressing the agglomerated resin sand into the leakage trough. This design only needs one power device to achieve crushing and leakage, thereby making the grinding more thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is one of the partial cross-sectional structural schematic diagrams of the storage box of the present invention; Figure 3 This is the second schematic diagram of the partial cross-sectional structure of the storage box of the present invention; Figure 4 It is a schematic diagram of the briquetting structure of the present invention.

[0015] In the figure: 1. sand mixing cylinder; 2. storage box; 4. conveying equipment; 5. grinding mechanism; 6. top pressing mechanism; 7. bracket; 51. upper grinding plate; 52. motor; 53. connecting shaft; 54. lower grinding plate; 55. leakage trough; 56. lever; 57. arc block; 61. extension rod; 62. slide rod; 63. pressure block; 64. spring; 65. connecting sleeve; 66. lever; 67. travel groove; 68. connecting column; 69. connecting ball; 610. top ball. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-4 As shown, a casting mold for resin sand casting comprises a sand mixing cylinder 1, a conveying device 4, a grinding mechanism 5 and a top pressing mechanism 6. A storage box 2 is provided inside the sand mixing cylinder 1. The inner wall of the sand mixing cylinder 1 is divided into an upper end and a lower end by the storage box. The upper end of the sand mixing cylinder 1 is used to store unground resin sand, and the lower end of the sand mixing cylinder 1 is used to store ground resin sand. The top and bottom ends of the sand mixing cylinder 1 are both connected to the conveying device 4, and the conveying device 4 is an auger. A grinding mechanism 5 is installed on the storage box 2, and a top pressing mechanism 6 is installed in the storage box 2. The top pressing mechanism 6 is installed in cooperation with the grinding mechanism 5. The outer wall of the sand mixing cylinder 1 is equidistantly fixedly connected with a bracket 7.

[0018] See also Figure 2-3As shown, the grinding mechanism 5 includes: an upper grinding plate 51, the bottom end of the storage box 2 is fixedly connected to the upper grinding plate 51, the top of the sand mixing cylinder 1 is fixedly connected to a motor 52, the output end of the motor 52 extends into the sand mixing cylinder 1 and is fixedly connected to a connecting shaft 53, the connecting shaft 53 is rotatably connected to the storage box 2 and the upper grinding plate 51, the bottom end of the connecting shaft 53 is fixedly connected to a lower grinding plate 54, the storage box 2 and the upper grinding plate 51 are both provided with a leakage groove 55, one end of the connecting shaft 53 is fixedly connected to a lever 56, and the lever An arc block 57 is fixedly connected to one end of 56, and the connecting shaft 53 is driven to rotate by the motor 52, so that the lever 56 drives the arc block 57 to rotate along the storage box 2, thereby pushing the resin sand in the storage box 2 into the leakage groove 55, and the lower grinding plate 54 is driven by the rotation of the connecting shaft 53, so that the upper grinding plate 51 and the lower grinding plate 54 are rubbed relative to each other, and the originally agglomerated resin sand is crushed again. The diameter of the upper grinding plate 51 is larger than the diameter of the lower grinding plate 54, and the motor 52 is a reduction motor.

[0019] See also Figure 2-4 As shown, the pressing mechanism 6 includes: an extension rod 61, the inner wall of the storage box 2 is fixedly connected with the extension rod 61, one end of the extension rod 61 is slidably connected with a slide rod 62, the bottom end of the slide rod 62 is fixedly connected with a pressure block 63, the outer wall of the slide rod 62 is sleeved with a spring 64, the top end of the spring 64 is fixedly connected to the bottom end of the extension rod 61, the bottom end of the spring 64 is fixedly connected to the top end of the pressure block 63, and the pressure block 63 overlaps with the leakage groove 55 in the vertical direction, and a connecting sleeve 65 is fixedly connected at the center of the storage box 2, and the connecting sleeve 65 is rotatably connected to the connecting shaft 53, and one side of the connecting sleeve 65 is rotatably connected to a lever 6 6. A travel groove 67 is provided at one end of the lever 66, a connecting column 68 is fixedly connected to one end of the slide rod 62, and the connecting column 68 is slidably connected to the inner wall of the travel groove 67. A connecting ball 69 is fixedly connected to the other end of the lever 66, and a top ball 610 is fixedly connected to one end of the lever 56. The connecting shaft 53 drives the lever 56 to rotate, so that the lever 56 and the arc block 57 push the agglomerated resin sand into the leakage groove 55 for the upper grinding plate 51 and the lower grinding plate 54 to grind the agglomerated resin sand and then use it for the next casting. A telescopic rubber sleeve is fixedly connected between the extension rod 61 and the pressing block 63.

[0020] See also Figure 1-4 As shown, a resin sand casting process: S1. Resin sand foundries are generally equipped with a resin sand production line. In the sand mixing stage, molding sand and core sand are prepared for molding. Generally, a sand mixer is used to put old sand and a proper amount of clay into the sand mixing cylinder 1 for mixing. The old resin sand is transported to the inside of the sand mixing cylinder 1 through the conveying device 4 at the top of the sand mixing cylinder 1, and clay is injected into the conveying device. The mixture of resin sand and clay falls into the storage box 2. At this time, the motor 52 is started, and the lever 56 and the arc block 57 are driven to rotate along the storage box 2 through the connecting shaft 53 to push the mixture into the leakage trough 55. The grinding plate 54 rotates, so that the upper grinding plate 51 and the lower grinding plate 54 rub against each other, so that the mixture is crushed and mixed. When the connecting shaft 53 rotates, the top ball 610 is driven to rotate. When the top ball 610 and the connecting ball 69 are squeezed against each other, the connecting ball 69 drives the lever 66 to rotate along the connecting sleeve 65, so that the stroke groove 67 at one end of the lever 66 slides with the connecting column 68, and drives the pressing block 63 to press downward, thereby stretching the spring 64 and pressing the agglomerated resin sand into the leakage trough 55 for the upper grinding plate 51 and the lower grinding plate 54 to grind it.

[0021] S2, mold making stage, make molds and core boxes according to the parts drawings. Generally, wooden molds can be used for single pieces, plastic molds or metal molds (commonly known as iron molds or steel molds) can be made for mass production, and templates can be made for large quantities of castings.

[0022] S3, modeling stage, use molding sand to form the casting cavity, form the internal shape of the casting, put the mold into the cavity, and close the upper and lower sand boxes. Modeling is the key link in casting.

[0023] S4, smelting stage, according to the required metal components to prepare the chemical composition, select the appropriate melting furnace to melt the alloy material, to form qualified liquid metal (including qualified composition, qualified temperature). Smelting generally uses a cupola or electric furnace (due to environmental protection requirements, cupola is now basically banned, basically use electric furnace).

[0024] S5, pouring stage, use a ladle to pour the molten iron from the electric furnace into the mold. When pouring molten iron, you need to pay attention to the pouring speed so that the molten iron fills the entire cavity. Both smelting and pouring require professionally trained technicians to operate, and professional work clothes must be worn during the operation. In addition, pouring molten iron is dangerous and safety precautions must be taken.

[0025] S6, cleaning stage, after pouring, wait for the molten metal solution to cool and solidify, use a hammer to remove the gate and shake off the resin sand on the surface of the casting, then use a shot blasting machine or sand blasting machine to sandblast the surface of the casting, so that the surface of the casting will appear very clean. For some castings with special requirements or some castings that cannot meet the requirements, simple processing may be required, generally using a grinding wheel or grinder for processing and grinding to remove burrs and make the casting smoother.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A resin sand casting mold, characterized in that: include: A sand mixing cylinder (1), wherein a storage box (2) is provided inside the sand mixing cylinder (1), and the inner wall of the sand mixing cylinder (1) is divided into an upper end and a lower end by the storage box, the upper end of the sand mixing cylinder (1) is used to store unground resin sand, and the lower end of the sand mixing cylinder (1) is used to store ground resin sand; A conveying device (4), the top and bottom ends of the sand mixing cylinder (1) are both connected to the conveying device (4); A grinding mechanism (5), wherein the storage box (2) is provided with a grinding mechanism (5); A pressing mechanism (6) is installed in the storage box (2), and the pressing mechanism (6) is installed in coordination with the grinding mechanism (5).

2. A resin sand casting mold according to claim 1, characterized in that: The grinding mechanism (5) comprises an upper grinding plate (51), the bottom end of the storage box (2) is fixedly connected to the upper grinding plate (51), the top end of the sand mixing cylinder (1) is fixedly connected to a motor (52), the output end of the motor (52) extends into the sand mixing cylinder (1) and is fixedly connected to a connecting shaft (53), the connecting shaft (53) is rotatably connected to the storage box (2) and the upper grinding plate (51), the bottom end of the connecting shaft (53) is fixedly connected to a lower grinding plate (54), the storage box (2) and the upper grinding plate (51) are both provided with a material leakage groove (55), one end of the connecting shaft (53) is fixedly connected to a lever (56), and one end of the lever (56) is fixedly connected to an arc block (57).

3. A resin sand casting mold according to claim 2, characterized in that: The pressing mechanism (6) comprises an extension rod (61), the inner wall of the storage box (2) is fixedly connected to the extension rod (61), one end of the extension rod (61) is slidably connected to a slide rod (62), the bottom end of the slide rod (62) is fixedly connected to a pressing block (63), the outer wall of the slide rod (62) is sleeved with a spring (64), the top end of the spring (64) is fixedly connected to the bottom end of the extension rod (61), the bottom end of the spring (64) is fixedly connected to the top end of the pressing block (63), and the pressing block (63) overlaps with the leakage groove (55) in the vertical direction. A connecting sleeve (65) is fixedly connected to the center of the storage box (2), the connecting sleeve (65) is rotatably connected to the connecting shaft (53), one side of the connecting sleeve (65) is rotatably connected to a lever (66), one end of the lever (66) is provided with a travel groove (67), one end of the slide rod (62) is fixedly connected to a connecting column (68), the connecting column (68) is slidably connected to the inner wall of the travel groove (67), the other end of the lever (66) is fixedly connected to a connecting ball (69), and one end of the lever (56) is fixedly connected to a top ball (610).

4. A resin sand casting mold according to claim 1, characterized in that: Brackets (7) are fixedly connected to the outer wall of the sand mixing cylinder (1) at equal intervals.

5. A resin sand casting mold according to claim 2, characterized in that: The diameter of the upper grinding plate (51) is greater than the diameter of the lower grinding plate (54).

6. A resin sand casting mold according to claim 2, characterized in that: The motor (52) is a reduction motor.

7. A resin sand casting mold according to claim 3, characterized in that: A telescopic rubber sleeve is fixedly connected between the extension rod (61) and the pressing block (63).

8. A casting process for a resin sand casting mold as claimed in any one of claims 1 to 7, characterized in that: The steps include: S1, sand mixing stage, preparing molding sand and core sand for molding, using a sand mixer to put old sand and a proper amount of clay into the mixing drum (1) for mixing, conveying the old resin sand into the mixing drum (1) through the conveying device (4) at the top of the mixing drum (1), and injecting clay into the conveying device, the mixture of resin sand and clay falls into the storage box (2), at this time, the motor (52) is started, and the lever (56) and the arc block (57) are driven to rotate along the storage box (2) through the connecting shaft (53), and the mixture is pushed into the leakage trough (55), and the lower grinding plate (54) is driven to rotate through the connecting shaft (53), so that the upper grinding plate (54) is rotated. The plate (51) and the lower grinding plate (54) rub against each other, thereby crushing and mixing the mixture. When the connecting shaft (53) rotates, the top ball (610) is driven to rotate. When the top ball (610) and the connecting ball (69) are pressed against each other, the connecting ball (69) drives the lever (66) to rotate along the connecting sleeve (65), so that the travel groove (67) at one end of the lever (66) and the connecting column (68) slide, and drive the pressing block (63) to press downward, thereby stretching the spring (64) and pressing the agglomerated resin sand into the leakage groove (55) for grinding by the upper grinding plate (51) and the lower grinding plate (54); S2, mold making stage, making molds and core boxes according to parts drawings; S3, the molding stage, using molding sand to form the casting cavity, forming the internal shape of the casting, placing the matching mold into the cavity, and closing the upper and lower sand boxes; S4, smelting stage, prepare the chemical composition according to the required metal composition, select a suitable melting furnace to melt the alloy material, and form qualified liquid metal; S5, pouring stage, using a ladle to pour the molten iron in the melting furnace into the mold cavity; S6, cleaning stage, after pouring, wait for the molten metal solution to cool and solidify, remove the gate and shake off the resin sand on the surface of the casting, and then use a shot blasting machine or a sand blasting machine to sandblast the surface of the casting.

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