Iron sand box for casting and processing castings

Abstract

The invention discloses an iron sand box for casting and processing castings, which comprises an iron shell mechanism, the iron shell mechanism comprises a lower iron shell and an upper iron shell, and the opposite sides of the upper iron shell and the lower iron shell are respectively provided with a forming groove; the sand box layer is fixedly covered in the forming grooves of the upper iron shell and the lower iron shell to form a workpiece forming cavity; the lower exhaust assembly comprises a plurality of lower exhaust holes evenly distributed in the lower iron shell, a lower cover is installed on the bottom sides of the lower exhaust holes, vent pipes are installed on the lower cover in a penetrating mode, corresponding second pistons are installed in the lower exhaust holes in the upper sides of the vent pipes, balance weight floating bodies are installed on the lower sides of the second pistons, and lower sealing balls are installed on the upper portions of the second pistons. Corresponding water is filled into the lower exhaust hole through the vent pipe, so that the counterweight floating body floats upwards. On the basis that casting machining is not affected, gas generated by thermal decomposition of organic matter in the coated sand can be effectively, timely and fully exhausted, and therefore the surface quality of a casting is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of mold technology for casting processing, specifically to an iron sand box for casting processing. Background Technology

[0002] Casting is a process in which the casting material is heated to a liquid state and then poured into a casting cavity conforming to the shape of the part using appropriate pouring equipment. After cooling and solidification, the part or blank is obtained. With the improvement of casting technology, the iron mold sand casting process has begun to be widely used in casting.

[0003] The mold used in the iron mold sand casting process is mainly an iron sand box, which consists of a set of iron shells with forming grooves on opposite sides. A layer of sand is fixedly covered on the walls of the forming grooves of the set of iron shells. After the iron shells are closed, the sand box layers set in the iron shells combine to form the corresponding workpiece casting cavity. Since the sand box layer needs to use some organic materials during the sand covering process, these organic materials will generate gas when heated and decomposed. In order to achieve the discharge of this gas, the existing practice is to set vent holes on the iron shells and then fill the vent holes with venting sand cores to maintain the support of the sand box layer and ensure that the vent holes have a certain venting effect. Although the setting of venting sand cores can make the vent holes have a certain venting effect, its venting effect is still relatively limited, resulting in the inability to discharge gas in a timely and sufficient manner, thus causing defects such as porosity and depressions on the surface of the casting. In severe cases, it may even lead to the scrapping of the casting.

[0004] Therefore, the research objective of this invention is to design an iron sand box for casting processing that can effectively and promptly discharge the gas generated by the thermal decomposition of organic matter in the sand coating, thereby effectively improving the surface quality of the casting, without affecting the casting process. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, the present invention provides an iron sand mold box for casting and processing, which can effectively solve the technical problems existing in the prior art.

[0006] The technical solution of this invention is: A casting sand box for casting processing, comprising The iron shell mechanism includes a lower iron shell and an upper iron shell that is closed and fixed to the upper side of the lower iron shell. The upper iron shell and the lower iron shell are respectively provided with corresponding forming grooves on opposite sides. Under the fixation of the corresponding locking mechanism, the upper iron shell and the lower iron shell are assembled. A sand box layer is fixedly covered within the forming grooves of the upper and lower iron shells to form a workpiece forming cavity; The lower venting assembly includes a plurality of lower venting holes evenly distributed on the lower iron shell. A corresponding lower cover is installed on the bottom side of each lower venting hole. A vent pipe is installed through each lower cover and located inside the lower venting hole. A corresponding second piston is installed in the lower venting hole on the upper side of the vent pipe. A corresponding counterweight float is installed downward on the lower side of the second piston through a third elastic element. A lower sealing sphere that closes the top of the lower venting hole is installed upward on the upper part of the second piston through a fourth elastic element. Water is filled into the lower venting hole through the vent pipe, causing the counterweight float to float. The third and fourth elastic elements are compressed respectively.

[0007] After casting, the water located below the second piston is heated and evaporates, and is discharged along the vent pipe. The counterweight float descends until the third elastic element is stretched, and the second piston descends to form a vacuum above the lower vent hole. The lower sealing ball moves down, and the gas in the sand box layer is discharged into the lower vent hole through the gap between the lower sealing ball and the lower vent hole. After venting is completed, the lower sealing ball is sealed at the top of the lower vent hole under the action of the fourth elastic element.

[0008] The lower cover is installed on the upper side of the bottom end of the lower exhaust hole, and the bottom end of the vent pipe extends to the lower side of the lower cover and is located inside the lower exhaust hole.

[0009] The iron sand box also includes an upper venting assembly, which includes a plurality of upper venting holes evenly distributed on the upper iron shell. An upper cover is installed on the top of the upper venting holes. The upper cover is provided with corresponding venting holes, and a corresponding first piston is fixedly connected to the upper cover downwards via a first elastic member. The bottom side of the first piston is fixedly connected downwards via a second elastic member to an upper sealing sphere for sealing the bottom end of the upper venting hole. Water is injected into the upper side of the first piston through the venting holes. When the first piston is under weight, it moves downwards, the first elastic member is stretched, and the second elastic member is compressed.

[0010] After casting is completed, the water located above the first piston evaporates after being heated and is discharged through the vent hole. After the weight of the first piston is reduced to less than the pulling force of the first elastic element, the first piston rises to form a vacuum on the lower side of the upper vent hole. The upper sealing ball moves upward, and the gas in the sand box layer is discharged into the upper vent hole through the gap between the upper sealing ball and the upper vent hole. After the venting is completed, the upper sealing ball is sealed at the bottom end of the upper vent hole under the action of the second elastic element.

[0011] The first elastic element, the second elastic element, the third elastic element, and the fourth elastic element are each made of helical springs.

[0012] The upper iron shell is provided with a casting port connected to the forming cavity of the workpiece and a gating and riser connected to the forming cavity of the workpiece.

[0013] The upper and lower iron shells are respectively fixed outwards at their periphery with corresponding mating protrusions, and the mating protrusions of the upper and lower iron shells are locked and fixed by the locking mechanism.

[0014] The locking mechanism includes a plurality of C-shaped locking plates evenly distributed on the mating flange. One end of each C-shaped locking plate is provided with a corresponding tightening protrusion, and the other end of each C-shaped locking plate is respectively installed with a corresponding tightening bolt by means of threaded connection. The opposite side of the mating flange is provided with a limiting groove adapted to the tightening protrusion and the tightening bolt. By tightening the tightening bolt, the tightening protrusion and the tightening bolt are respectively fixed and locked in the limiting groove of the mating flange.

[0015] A set of corresponding hoisting rods are fixedly connected to both sides of the upper and lower iron shells, and corresponding anti-detachment plates are fixedly connected to the outer ends of the hoisting rods.

[0016] Advantages of this invention: 1) This invention includes a lower venting assembly comprising lower venting holes evenly distributed on the lower iron shell. A lower cover is installed on the bottom side of each lower venting hole, and corresponding venting pipes are installed through the lower cover. A second piston is installed inside the lower venting hole on the upper side of the venting pipe. A counterweight float is installed downwards on the lower side of the second piston via a third elastic element. A lower sealing sphere, forming a seal around the lower venting hole, is installed upwards on the upper part of the second piston via a fourth elastic element. Before casting, the lower sealing sphere is pressed using a tool, and then water is injected into the lower venting hole through the venting pipe, causing the counterweight float to float, thereby compressing the third and fourth elastic elements. Under the action of elasticity, the lower sealing sphere effectively provides support to the lower venting hole, thus providing reasonable support to the sand box layer and preventing the support force on the sand box layer in this area from failing to meet design requirements due to the lower venting hole configuration.

[0017] 2) After casting, the water located below the second piston evaporates upon heating and is discharged through the vent pipe. This not only effectively cools the lower iron shell but also allows the counterweight float to descend until the third elastic element is stretched, causing the second piston to descend and create a vacuum above the lower vent hole. This causes the lower sealing ball to move downward, discharging the gas in the sand box layer through the gap between the lower sealing ball and the lower vent hole into the lower vent hole. This effectively and sufficiently discharges the gas generated by the thermal decomposition of organic matter in the coating sand without affecting the casting process, thereby effectively improving the surface quality of the casting.

[0018] 3) After the venting is completed, the lower sealing ball can still maintain a certain supporting force under the action of the fourth elastic element to seal the top of the corresponding lower vent hole, so as to maintain the supporting force on the sand box layer.

[0019] 4) The lower cover of the present invention is installed on the upper side of the bottom end of the lower vent hole, and the bottom end of the vent pipe extends to the lower side of the lower cover and is located inside the lower vent hole. Thus, without affecting water injection and venting, the vent pipe is effectively housed and installed to prevent positional interference problems when it is transported on the roller conveyor mechanism.

[0020] 5) This invention also includes an upper venting assembly, comprising upper venting holes evenly distributed on the upper iron shell. An upper cover is mounted on the top of each upper venting hole. The upper cover has ventilation holes and a first piston is fixed downwards via a first elastic element. A second elastic element is fixed downwards to the bottom of the first piston to an upper sealing sphere for sealing the upper venting holes. Before casting, the upper sealing sphere is pressed using a tool, and then water is injected to the upper side of the first piston through the ventilation holes. The first piston moves downwards under its weight, stretching the first elastic element and compressing the second elastic element. Under the elastic force, the upper sealing sphere effectively provides support to the upper venting holes, thus providing reasonable support to the sand box layer and preventing the upper venting holes from causing insufficient support for the sand box layer in that area to meet design requirements.

[0021] 6) After casting, the water located above the first piston evaporates under high heat and is discharged through the vent. This not only effectively cools the upper iron shell but also reduces the weight on the first piston. Once the weight is less than the pulling force of the first elastic element, the first piston rises under the elastic force of the first elastic element, creating a vacuum below the upper vent. This causes the upper sealing ball to move upward, discharging the gas in the sand box layer through the gap between the upper sealing ball and the upper vent. This further effectively and fully discharges the gas generated by the thermal decomposition of organic matter in the coating sand without affecting the casting process, thereby effectively improving the surface quality of the casting.

[0022] 7) After the venting is completed, the upper sealing ball can still maintain a certain supporting force under the action of the second elastic element to seal the bottom end of the upper venting hole, so as to further maintain the supporting force on the sand box layer. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a diagram showing the usage state of the present invention.

[0025] Figure 3 This is a cross-sectional view of the present invention.

[0026] Figure 4 for Figure 3 A magnified view of part A in the image.

[0027] Figure 5 for Figure 3 A magnified view of part B in the image.

[0028] Figure 6 for Figure 3 A magnified view of part C in the image.

[0029] In the attached diagram: 1. Iron shell mechanism, 101. Lower iron shell, 102. Upper iron shell, 2. Locking mechanism, 201. C-shaped clamping plate, 202. Tightening protrusion, 203. Tightening bolt, 3. Sand box layer, 4. Casting port, 5. Upper venting assembly, 501. Upper venting hole, 502. Upper cover, 503. First elastic element, 504. First piston, 505. Second elastic element, 506. Upper sealing ball, 6. Vent hole, 7. Lower venting assembly, 701. Lower venting hole, 702. Second piston, 703. Third elastic element, 704. Counterweight float, 705. Fourth elastic element, 706. Lower sealing ball, 707. Vent pipe, 8. Sprue and riser, 9. Butt joint protrusion, 10. Limiting groove, 11. Lifting rod, 12. Anti-detachment plate, 13. Detailed Implementation

[0030] To facilitate understanding by those skilled in the art, the structure of the present invention will now be described in further detail with reference to the accompanying drawings: refer to Figure 1-6 A type of iron sand box for casting and machining, comprising: The iron shell mechanism 1 includes a lower iron shell 101 and an upper iron shell 102 that is closed and fixed to the upper side of the lower iron shell 101. The upper iron shell 102 and the lower iron shell 101 are respectively provided with corresponding forming grooves on opposite sides. Under the fixation of the corresponding locking mechanism 2, the upper iron shell 102 and the lower iron shell 101 are assembled. The sand box layer 3 is fixedly covered in the forming groove of the upper iron shell 102 and the lower iron shell 101 to form a workpiece forming cavity; The lower venting assembly 7 includes a plurality of lower venting holes 701 evenly distributed on the lower iron shell 101. A corresponding lower cover 702 is installed on the bottom side of each lower venting hole 701. A vent pipe 8 is installed through each lower cover 702 and located inside the lower venting hole 701. A corresponding second piston 703 is installed in the lower venting hole 701 above the vent pipe 8. A corresponding counterweight float 705 is installed downwards on the lower side of the second piston 703 via a third elastic member 704. A lower sealing ball 707 that closes the top of the lower venting hole 701 is installed upwards on the upper part of the second piston 703 via a fourth elastic member 706. Water is filled into the lower venting hole 701 through the vent pipe 8 to make the counterweight float 705 float. The third elastic member 704 and the fourth elastic member 706 are compressed respectively.

[0031] After casting is completed, the water located below the second piston 703 is heated and evaporated, and discharged along the vent pipe 8. The counterweight float 705 descends to the third elastic element 704 and is stretched. The second piston 703 descends to form a vacuum above the lower vent hole 701. The lower sealing ball 707 moves down, and the gas in the sand box layer 3 is discharged into the lower vent hole 701 through the gap between the lower sealing ball 707 and the lower vent hole. After venting is completed, the lower sealing ball 707 is sealed at the top of the lower vent hole 701 under the action of the fourth elastic element 706.

[0032] The present invention includes a lower venting assembly 7, comprising lower venting holes 701 evenly distributed on the lower iron shell 101. A lower cover 702 is installed on the bottom side of the lower venting holes 701, and a corresponding vent pipe 8 is installed through the lower cover 702. A second piston 703 is installed in the lower venting hole 701 on the upper side of the vent pipe 8. A counterweight float 705 is installed downward on the lower side of the second piston 703 through a third elastic element 704. A lower sealing ball 707, which closes the lower venting hole 701, is installed upward on the upper part of the second piston 703 through a fourth elastic element 706. Before casting, the lower sealing ball 707 is pressed with a tool, and then water is poured into the lower venting hole 701 through the vent pipe 8 to make the counterweight float 705 float, thereby compressing the third elastic element 704 and the fourth elastic element 706 respectively. Under the action of elasticity, the lower sealing ball 707 effectively forms a certain supporting force on the lower vent hole 701, so as to form a reasonable supporting force on the sand box layer 3, thereby preventing the supporting force on the sand box layer 3 in this area from failing to meet the design requirements due to the setting of the lower vent hole 701.

[0033] After casting, the water located below the second piston 703 evaporates upon heating and is discharged along the vent pipe 8. This not only effectively cools the lower iron shell 101 but also allows the counterweight float 705 to descend until the third elastic element 704 is stretched, causing the second piston 703 to descend and create a vacuum above the lower vent hole 701. This causes the lower sealing ball 707 to move downwards, discharging the gas in the sand box layer 3 through the gap between the lower sealing ball 707 and the lower vent hole 701 into the lower vent hole 701. This effectively and sufficiently discharges the gas generated by the thermal decomposition of organic matter in the coating sand without affecting the casting process, thereby effectively improving the surface quality of the casting.

[0034] After the venting is completed, the lower sealing ball 707 can still maintain a certain supporting force under the action of the fourth elastic element 706 to seal the top of the corresponding lower vent hole 701, so as to maintain the supporting force on the sand box layer 3.

[0035] The lower cover 702 is installed on the upper side of the bottom end of the lower vent 701, and the bottom end of the vent pipe 8 extends to the lower side of the lower cover 702 and is located inside the lower vent 701. This effectively conceals the vent pipe 8 without affecting water injection and venting, preventing positional interference during its transport on the roller conveyor mechanism.

[0036] The iron sand box also includes an upper venting assembly 5, which includes a plurality of upper venting holes 501 evenly distributed on the upper iron shell 102. An upper cover 502 is installed on the top of the upper venting holes 501. The upper cover 502 is provided with corresponding venting holes 6. The upper cover 502 is fixedly connected to a corresponding first piston 504 downward through a first elastic member 503. The bottom side of the first piston 504 is fixedly connected to an upper sealing ball 506 downward through a second elastic member 505 for forming a closure at the bottom end of the upper venting holes 501. Water is injected into the upper side of the first piston 504 through the venting holes 6. When the first piston 504 is under the weight, it moves downward, the first elastic member 503 is stretched, and the second elastic member 505 is compressed.

[0037] After casting is completed, the water located above the first piston 504 evaporates after being heated and is discharged through the vent hole 6. After the weight of the first piston 504 is reduced to less than the pulling force of the first elastic member 503, the first piston 504 rises to form a vacuum on the lower side of the upper vent hole 501. The upper sealing ball 506 moves upward, and the gas in the sand box layer 3 is discharged into the upper vent hole 501 through the gap between the upper sealing ball 506 and the upper vent hole 501. After the venting is completed, the upper sealing ball 506 is sealed at the bottom end of the upper vent hole 501 under the action of the second elastic member 505.

[0038] The present invention also includes an upper venting assembly 5, which includes upper venting holes 501 evenly distributed on the upper iron shell 102. An upper cover 502 is installed on the top of the upper venting holes 501. The upper cover 502 is provided with vent holes 6 and a first piston 504 is fixed downwards by a first elastic member 503. An upper sealing ball 506 for sealing the upper venting holes 501 is fixed downwards by a second elastic member 505 on the bottom side of the first piston 504. Before casting, the upper sealing ball 506 is pressed by a tool, and then water is injected into the upper side of the first piston 504 through the vent holes 6. The first piston 504 moves downwards under the weight, causing the first elastic member 503 to be stretched and the second elastic member 505 to be compressed. Under the action of elasticity, the upper sealing ball 506 effectively forms a certain supporting force on the upper vent 501, so as to form a reasonable supporting force on the sand box layer 3, thereby preventing the supporting force on the sand box layer 3 in this area from failing to meet the design requirements due to the setting of the upper vent 501.

[0039] After casting, the water located above the first piston 504 will evaporate under high heat and be discharged through the vent hole 6. This not only effectively cools the upper iron shell 102 but also reduces the weight on the first piston 504. Once the weight on the first piston 504 is less than the pulling force of the first elastic element 503, the first piston 504 rises under the elastic force of the first elastic element 503, creating a vacuum below the upper vent hole 501. This causes the upper sealing ball 506 to move upward, discharging the gas in the sand box layer 3 through the gap between the upper sealing ball 506 and the upper vent hole 501 into the upper vent hole 501. This further effectively and fully discharges the gas generated by the thermal decomposition of organic matter in the coating sand without affecting the casting process, thereby effectively improving the surface quality of the casting.

[0040] After the venting is completed, the upper sealing ball 506 can still maintain a certain supporting force under the action of the second elastic element 505 to seal the bottom end of the upper vent hole 501, so as to further maintain the supporting force on the sand box layer 3.

[0041] In this embodiment, the first elastic element 503, the second elastic element 505, the third elastic element 704, and the fourth elastic element 706 are respectively coil springs.

[0042] The upper iron shell 102 is provided with a casting port 4 connected to the workpiece forming cavity and a gating and riser 9 connected to the workpiece forming cavity.

[0043] The upper iron shell 102 and the lower iron shell 101 are respectively fixed outward at their periphery with corresponding mating protrusions 10, and the mating protrusions 10 of the upper iron shell 102 and the lower iron shell 101 are locked and fixed by the locking mechanism 2.

[0044] The locking mechanism 2 includes a plurality of C-shaped clamping plates 201 evenly distributed on the mating flange 10. One end of each C-shaped clamping plate 201 is provided with a corresponding tightening protrusion 202, and the other end of each C-shaped clamping plate 201 is respectively installed with a corresponding tightening bolt 203 by means of threaded connection. On the opposite side of the mating flange 10, a limiting groove 11 adapted to the tightening protrusion 202 and the tightening bolt 203 is provided. By tightening the tightening bolt 203, the tightening protrusion 202 and the tightening bolt 203 are respectively fixedly clamped in the limiting groove 11 of the mating flange 10.

[0045] A set of corresponding hoisting rods 12 are fixedly connected to both sides of the upper iron shell 102 and the lower iron shell 101, and corresponding anti-detachment plates 13 are fixedly connected to the outer ends of the hoisting rods 12.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A type of iron sand mold for casting and machining, characterized in that, include The iron shell mechanism (1) includes a lower iron shell (101) and an upper iron shell (102) that is closed and fixed on the upper side of the lower iron shell (101). The upper iron shell (102) and the lower iron shell (101) are respectively provided with corresponding forming grooves on opposite sides. Under the fixation of the corresponding locking mechanism (2), the upper iron shell (102) and the lower iron shell (101) are assembled. The sand box layer (3) is fixedly covered in the forming groove of the upper iron shell (102) and the lower iron shell (101) to form a workpiece forming cavity; The lower exhaust assembly (7) includes a plurality of lower exhaust holes (701) evenly distributed on the lower iron shell (101). A corresponding lower cover (702) is installed on the bottom side of each lower exhaust hole (701). Each lower cover (702) has a vent pipe (8) installed through it within the lower exhaust hole (701). A corresponding second piston (703) is installed in the lower exhaust hole (701) above the vent pipe (8). The lower side of the second piston (703) is connected to... The third elastic element (704) is installed with a corresponding counterweight float (705) facing downwards. The upper part of the second piston (703) is installed with a lower sealing ball (707) that forms a seal on the top of the lower vent hole (701) through the fourth elastic element (706). Water is filled into the lower vent hole (701) through the vent pipe (8) to make the counterweight float (705) float upwards. The third elastic element (704) and the fourth elastic element (706) are compressed respectively.

2. The iron sand box for casting and machining of castings according to claim 1, characterized in that, After casting is completed, the water located below the second piston (703) is heated and evaporates, and is discharged along the vent pipe (8). The counterweight float (705) descends to the third elastic element (704) and is stretched. The second piston (703) descends to form a vacuum on the upper side of the lower exhaust hole (701). The lower sealing ball (707) moves down, and the gas in the sand box layer (3) is discharged into the lower exhaust hole (701) through the gap between the lower sealing ball (707) and the lower exhaust hole (701). After the exhaust is completed, the lower sealing ball (707) is sealed at the top of the lower exhaust hole (701) under the action of the fourth elastic element (706).

3. The iron sand box for casting and machining of castings according to claim 1, characterized in that, The lower cover (702) is installed on the upper side of the bottom end of the lower exhaust hole (701), and the bottom end of the vent pipe (8) extends to the lower side of the lower cover (702) and is located inside the lower exhaust hole (701).

4. The iron sand box for casting and machining of castings according to claim 1, characterized in that, The iron sand box also includes an upper venting assembly (5), which includes a plurality of upper venting holes (501) evenly distributed on the upper iron shell (102). An upper cover (502) is installed on the top of the upper venting holes (501). The upper cover (502) is provided with corresponding vent holes (6). The upper cover (502) is fixedly connected to a corresponding first piston (504) downward through a first elastic member (503). The bottom side of the first piston (504) is fixedly connected to an upper sealing ball (506) downward through a second elastic member (505) for forming a closure at the bottom end of the upper venting hole (501). Water is injected into the upper side of the first piston (504) through the vent holes (6). The first piston (504) moves downward under the weight, the first elastic member (503) is stretched, and the second elastic member (505) is compressed.

5. The iron sand box for casting and machining of castings according to claim 4, characterized in that, After casting is completed, the water located above the first piston (504) is heated and evaporates, and is discharged through the vent hole (6). After the weight of the first piston (504) is reduced to less than the pulling force of the first elastic element (503), the first piston (504) rises to form a vacuum on the lower side of the upper exhaust hole (501). The upper sealing ball (506) moves upward, and the gas in the sand box layer (3) is discharged into the upper exhaust hole (501) through the gap between the upper sealing ball (506) and the upper exhaust hole (501). After the exhaust is completed, the upper sealing ball (506) is sealed at the bottom end of the upper exhaust hole (501) under the action of the second elastic element (505).

6. The iron sand box for casting and machining of castings according to claim 5, characterized in that, The first elastic element (503), the second elastic element (505), the third elastic element (704), and the fourth elastic element (706) are each a helical spring.

7. The iron sand box for casting and machining of castings according to claim 1, characterized in that, The upper iron shell (102) is provided with a casting port (4) connected to the forming cavity of the workpiece, and a gating and riser port (9) connected to the forming cavity of the workpiece.

8. The iron sand box for casting and machining of castings according to claim 1, characterized in that, The upper iron shell (102) and the lower iron shell (101) are respectively fixed to the periphery of the corresponding mating protrusions (10), and the mating protrusions (10) of the upper iron shell (102) and the lower iron shell (101) are locked and fixed by the locking mechanism (2).

9. A casting sand box for casting processing according to claim 8, characterized in that, The locking mechanism (2) includes a plurality of C-shaped clamping plates (201) evenly distributed on the mating flange (10). One end of each C-shaped clamping plate (201) is provided with a corresponding tightening protrusion (202), and the other end of each C-shaped clamping plate (201) is provided with a corresponding tightening bolt (203) by means of threaded connection. On the opposite side of the mating flange (10), there are limiting grooves (11) that are adapted to the tightening protrusion (202) and the tightening bolt (203). By tightening the tightening bolt (203), the tightening protrusion (202) and the tightening bolt (203) are fixedly clamped in the limiting groove (11) of the mating flange (10).

10. The iron sand box for casting and machining of castings according to claim 1, characterized in that, A set of corresponding hoisting rods (12) are fixedly connected to both sides of the upper iron shell (102) and the lower iron shell (101), and corresponding anti-detachment plates (13) are fixedly connected to the outer ends of the hoisting rods (12).

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