A stainless steel flange casting device

Abstract

The application discloses a stainless steel flange casting device and relates to the technical field of casting devices.The device comprises an upper sand box, a lower sand box, a lower sand mold, an annular flange, an upper sand mold, a first mold cavity, a second mold cavity, a column type core, a buffer cavity, a pouring gate and a riser; and a lifting unit is arranged to drive the vertical movement of the upper sand mold, so that the annular flange and the surface of the first mold cavity abut, a flange cavity is formed between the disc cavity and the second mold cavity, and in use, the upper sand mold is away from the lower sand mold, the annular flange is clamped in the first mold cavity, a ring-shaped buffer cavity is formed between the top surface of the annular flange and the bottom surface of the first mold cavity, and the buffer cavity can store excess metal liquid; after pouring, the upper sand mold moves towards the lower sand mold, the buffer cavity is closed, the excess metal liquid enters the flange cavity, the air in the flange cavity is extruded, the air is discharged through the riser and the pouring gate, and the precision and efficiency of casting are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of casting equipment, in particular to a stainless steel flange casting equipment. BACKGROUND

[0002] The stainless steel flange is a general-purpose pipe fitting connector made of 304 stainless steel, corresponding to the American ASTM standard grade 304 and the Chinese grade 0Cr19Ni9 (0Cr18Ni9), and the chemical composition contains 19% chromium, 8.25-10.5% nickel and less than 0.08% carbon. It has corrosion resistance, heat resistance and good mechanical properties, and is suitable for food processing, chemical equipment, nuclear facilities and building materials industry. The flange is divided into 13 types such as flat welding, butt welding and threading according to international standards (such as GB, ANSI and JIS), supports welding, threading and other connection methods, and the sealing surface design covers flat, boss and other structures. The product surface is electroplated or treated with anti-rust treatment to enhance durability, and the pressure grade covers 0.25Mpa to 250Mpa, which is suitable for various industrial scenes such as plate heat exchanger and fluid conveying equipment. 304 stainless steel is a widely used chromium-nickel stainless steel with good corrosion resistance, heat resistance, low temperature strength and mechanical properties. In the atmosphere, it is resistant to corrosion, and if it is in an industrial atmosphere or a heavily polluted area, it needs to be cleaned in time to avoid corrosion. It is suitable for the processing, storage and transportation of food. It has good processing performance and weldability. Plate heat exchanger, corrugated pipe, household appliance, building material, chemical industry, food industry, etc.

[0003] Sand casting refers to a casting method for producing castings in a sand mold. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting method. Because the molding material used in sand casting is cheap and easy to obtain, the mold manufacturing is simple, and it can adapt to single piece production, batch production and mass production of castings, and has been a basic process in casting production for a long time. Sand casting has been used for centuries. Sand casting is used to manufacture large parts such as gray cast iron, ductile iron, stainless steel and other types of steel. The main steps include drawing, molding, core making, molding, melting and pouring, cleaning, etc.

[0004] When the stainless steel flange is sand cast, the worker operates the ladle to make the metal liquid enter the cavity of the sand mold. Since there is air in the cavity during ladling, an exhaust hole is provided in the sand mold to allow the air in the cavity to be exhausted during ladling. Since the metal liquid may enter the exhaust hole and block the exhaust hole, it may cause the air to be unable to exhaust from the exhaust hole, or part of the metal liquid to enter the exhaust hole, thereby affecting the casting efficiency and precision. SUMMARY

[0005] In view of the problems in the prior art described above, the present application is proposed. Therefore, the present application aims at providing a stainless steel flange casting device, which aims to solve the problem that there is air in the cavity during pouring, so an exhaust hole is needed to be arranged in the sand mold to enable the air in the cavity to be discharged during pouring. Since the molten metal may enter the exhaust hole and block the exhaust hole, it may cause the air to be unable to be discharged from the exhaust hole, or part of the molten metal enters the exhaust hole, thereby affecting the casting efficiency and precision.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a stainless steel flange casting device, comprising an upper sand box and a lower sand box, further comprising:

[0007] a lower sand mold embedded in the top surface of the lower sand box, the top surface of the lower sand mold is provided with a recessed disc cavity, and the inner wall of the disc cavity is provided with an annular flange protruding upwardly from the lower sand mold;

[0008] an upper sand mold slidingly embedded in the bottom surface of the upper sand box, the bottom surface of the upper sand mold is provided with a first cavity for the annular flange to pass freely, the inner wall of the first cavity is provided with a recessed second cavity, the inner wall of the second cavity is fixedly connected with a columnar core, and the first cavity and the upper surface of the annular flange form an annular buffer cavity, the top of the upper sand box is provided with a pouring opening, and the top of the upper sand mold is provided with a riser, and the riser and the pouring opening are connected in communication;

[0009] a lifting unit arranged in the upper sand box and used to drive the upper sand mold to move vertically, so that the annular flange and the surface of the first cavity abut, and the disc cavity and the second cavity form a flange cavity.

[0010] As a preferred scheme of the stainless steel flange casting device, the side walls of the upper sand box and the lower sand box are correspondingly fixedly connected with lug blocks, and a guide column is slidingly arranged between two adjacent lug blocks.

[0011] As a preferred scheme of the stainless steel flange casting device, the inner bottom wall of the disc cavity is provided with an air avoidance groove for the columnar core to pass freely.

[0012] As a preferred scheme of the stainless steel flange casting device, the upper sand mold is vertically fixedly provided with a plurality of hole cores, and the hole cores slidingly penetrate the lower sand mold.

[0013] As a preferred scheme of the stainless steel flange casting device, the lifting unit comprises a pressing cylinder mounted on the top of the upper sand box, the cylinder rod of the pressing cylinder slidingly penetrates the upper sand box and abuts against the top surface of the upper sand mold at the end, and the lower sand box is provided with a reset assembly, and the reset assembly has an upward elastic abutting force on the upper sand mold.

[0014] As a preferred scheme of the stainless steel flange casting equipment, the reset assembly comprises a connecting block fixed to the circumference of the upper sand mold, the opposite surfaces of the upper sand box and the lower sand box are respectively provided with a first through slot and a second through slot for the free passing of the connecting block, a reset spring is vertically installed in the second through slot, and the two ends of the reset spring in the elastic force direction are respectively elastically abutted against the connecting block and the bottom wall in the second through slot.

[0015] As a preferred scheme of the stainless steel flange casting equipment, the upper sand mold is provided with an accommodating cavity in communication with the first cavity, a floating part is slidingly and clampedly installed in the accommodating cavity, and the upper sand box is provided with a floating unit, which is used to drive the floating part to move when the upper sand mold moves, and the moving direction is consistent with the moving direction of the upper sand mold.

[0016] As a preferred scheme of the stainless steel flange casting equipment, the floating unit comprises a driving rod vertically fixed to the floating part, the driving rod slidingly penetrates through the top of the upper sand box, the upper sand mold is provided with a driving assembly, and the driving assembly is used to drive the driving rod to synchronously and uniformly move when the upper sand mold moves.

[0017] As a preferred scheme of the stainless steel flange casting equipment, the driving assembly comprises a swing arm hinged to the top of the upper sand box, the upper end of the driving rod is fixedly connected with a first sliding pin, the swing arm is provided with a waist-shaped hole for the insertion of the first sliding pin, the top of the upper sand mold is vertically fixed with a floating rod, the floating rod slidingly penetrates through the upper sand box and is fixedly connected with a second sliding pin, and the second sliding pin is inserted into the waist-shaped hole.

[0018] As a preferred scheme of the stainless steel flange casting equipment, the distance between the first sliding pin and the hinge point of the swing arm on the upper sand box is defined as L1, the distance between the second sliding pin and the hinge point of the swing arm on the upper sand box is defined as L2, and L2 is greater than L1.

[0019] 1、the upper sand mold and the lower sand mold are away from each other, the annular flange is clamped in the first cavity, a ring-shaped buffer cavity is formed between the top surface of the annular flange and the bottom surface of the first cavity, and the excess molten metal can be stored, then the upper sand mold moves towards the lower sand mold after the pouring ladle, the buffer cavity is closed, the excess molten metal enters the flange cavity and extrudes the air in the flange cavity when the buffer cavity is closed, the air is discharged through the riser and the pouring gate, the exhaust hole is not needed to be arranged, the exhaust hole blockage phenomenon is reduced, and the casting precision and efficiency are improved.

[0020] 2、The present application, by setting the swing arm, drive rod, floating rod, from the sand mold to the upper movement, so that the drive rod swing arm driven to swing, swing arm swing, so that the floating rod driven floating part upward movement, and then the metal liquid in the buffer cavity into the cavity, so that the total amount of metal liquid on both sides of the buffer cavity has a difference, and then when the upper sand mold and the lower sand mold each other close to the movement, the metal liquid in the buffer cavity is extruded out, so that the metal liquid away from the side of the riser in the flange cavity generates flow towards the riser direction, so that the bubbles in the metal liquid can be driven to the riser.

[0021] 3、The present application, by defining the first sliding pin and the swing arm on the upper sand box hinge point spacing size as L1, the second sliding pin and the swing arm on the upper sand box hinge point spacing size is defined as L2, L2 is greater than L1, so that the drive rod vertical movement stroke is less than the vertical movement stroke of the floating rod, and then the upper sand mold up and down small amplitude movement, the vertical movement amplitude of the floating part is larger, to ensure that the metal liquid in the flange cavity forms a flow state. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0023] Figure 1 It is a three-dimensional structure schematic diagram of a stainless steel flange casting equipment in the present application;

[0024] Figure 2 It is Figure 1 The position relation schematic diagram of the part structure after being cut open;

[0025] Figure 3 It is Figure 1 The position relation schematic diagram of the part structure after being cut open in another view;

[0026] Figure 4 It is Figure 1 The explosion decomposition schematic diagram of the structure;

[0027] Figure 5 It is Figure 4 The explosion decomposition schematic diagram of the structure in another view;

[0028] Figure 6 It is Figure 5 The enlarged schematic diagram of the local structure at A in the present application;

[0029] Figure 7 It is a position relation schematic diagram of the upper sand mold, the lower sand mold and the extrusion cylinder after assembly in the present application;

[0030] Figure 8 For Figure 7 The schematic diagram of the position relationship of the partial structure after being cut open;

[0031] Figure 9 For Figure 8 The enlarged schematic diagram of the partial structure at B in the middle;

[0032] Figure 10 The schematic diagram of the structure of the upper sand mold in the application.

[0033] The figure mark explanation: 1, the lower sand box; 2, the upper sand box; 3, the guide column; 4, the extrusion cylinder; 5, the swing arm; 6, the pouring gate; 7, the upper sand mold; 8, the column core; 9, the lower sand mold; 10, the annular flange; 11, the second cavity; 12, the buffer cavity; 13, the driving rod; 14, the disc cavity; 15, the second through slot; 16, the first through slot; 17, the connecting block; 18, the reset spring; 19, the hole core; 20, the waist-shaped hole; 21, the first cavity; 22, the containing cavity; 23, the first sliding pin; 24, the floating part; 25, the second sliding pin; 26, the floating rod. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0035] The embodiments of the application disclose a stainless steel flange casting equipment.

[0036] Embodiment 1

[0037] Referring to Figures 1-10 , a stainless steel flange casting equipment is provided in the first embodiment of the application. The stainless steel flange casting equipment comprises an upper sand box 2 and a lower sand box 1. Ear blocks are fixedly connected to the side walls of the upper sand box 2 and the lower sand box 1 correspondingly. A guide column 3 is slidably arranged between two adjacent ear blocks. The sliding of the guide column 3 on the ear blocks can guide and limit the relative movement of the upper sand box 2 and the lower sand box 1. The upper sand box 2 is connected with external lifting equipment, such as an electric hoist or a hydraulic cylinder. The upper sand box 2 is driven to move vertically by the external electric hoist or hydraulic cylinder, so that the upper sand box 2 and the lower sand box 1 can move away from and close to each other. A lower mounting cavity is formed in the top surface of the lower sand box 1. A lower sand mold 9 is embedded in the lower mounting cavity. A recessed disc cavity 14 is formed in the top surface of the lower sand mold 9. An annular flange 10 protruding upwards towards the lower sand mold 9 is formed in the inner wall of the disc cavity 14.

[0038] The upper installation cavity is provided on the bottom surface of the upper sand box 2, and the upper sand mold 7 is slidably embedded in the upper installation cavity. The upper sand mold 7 can freely slide up and down in the upper installation cavity. The bottom surface of the upper sand mold 7 is provided with a first mold cavity 21 for the annular flange 10 to freely pass through. The inner wall of the first mold cavity 21 is provided with a recessed second mold cavity 11. The inner wall of the second mold cavity 11 is fixedly connected with a columnar core 8. The inner bottom wall of the disc cavity 14 is provided with an empty slot for the columnar core 8 to freely pass through. The first mold cavity 21 and the upper surface of the annular flange 10 form an annular buffer cavity 12. The top of the upper sand box 2 is provided with a pouring gate 6. The top of the upper sand mold 7 is provided with a riser. The riser is provided with a metal pipe (not shown in the figure). The metal pipe is connected with the pouring gate 6. Thus, the riser and the pouring gate 6 are connected. During pouring, the molten metal is poured into the pouring gate 6, then enters the metal pipe from the pouring gate 6, and then enters the riser from the metal pipe. After the annular flange 10 abuts against the upper surface of the first mold cavity 21, the disc cavity 14 and the second mold cavity 11 form a flange mold cavity. The upper sand mold 7 is vertically fixedly provided with a plurality of hole cores 19. The hole cores 19 slidably penetrate the lower sand mold 9. The outer diameter of the hole core 19 is consistent with the hole diameter of the stainless steel flange. The outer diameter of the columnar core 8 is consistent with the hole diameter of the center hole of the stainless steel flange.

[0039] The upper sand box 2 is vertically provided with a plurality of extrusion cylinders 4. The number and position of the extrusion cylinders 4 correspond to the number and position of the upper sand mold 7. The cylinder rod of the extrusion cylinder 4 slidably penetrates the upper sand box 2 and abuts against the top surface of the upper sand mold 7. Specifically, in order to reduce the friction and wear of the cylinder rod of the extrusion cylinder 4 when sliding in the upper sand box 2, a sliding sleeve is fixedly embedded in the upper sand box 2. The cylinder rod of the extrusion cylinder 4 slidably penetrates the sliding sleeve. The sliding sleeve can prevent the cylinder rod of the extrusion cylinder 4 from being worn when sliding in the upper sand box 2. The upper sand mold 7 is fixedly connected with a connecting block 17. The upper sand box 2 and the lower sand box 1 are respectively provided with a first through groove 16 and a second through groove 15 for the connecting block 17 to freely pass through. The second through groove 15 is vertically provided with a return spring 18. The both ends of the return spring 18 are elastically abutted against the connecting block 17 and the inner bottom wall of the second through groove 15. When the cylinder rod of the extrusion cylinder 4 is elongated, a downward extrusion force is generated on the upper sand mold 7. Thus, the upper sand mold 7 moves downward and approaches the lower sand mold 9. When the upper sand mold 7 moves downward, the connecting block 17 generates an extrusion force on the return spring 18. Thus, the return spring 18 is compressed to accumulate elastic potential energy.

[0040] The upper sand mold 7 is provided with a containing cavity 22 communicated with the first cavity 21, and the floating part 24 is slidingly and fixedly arranged in the containing cavity 22. Specifically, the containing cavity 22 is located at the side of the upper sand mold 7 far away from the riser, the driving rod 13 is vertically fixedly connected with the floating part 24, the driving rod 13 slidingly penetrates the top of the upper sand box 2, the swing arm 5 swings up and down is hingedly connected to the top of the upper sand box 2, the first sliding pin 23 is fixedly connected to the upper end of the driving rod 13, the swing arm 5 is provided with the waist-shaped hole 20 for inserting the first sliding pin 23, the floating rod 26 is vertically fixedly connected to the top of the upper sand mold 7, the floating rod 26 slidingly penetrates the upper sand box 2 and is fixedly connected with the second sliding pin 25, the second sliding pin 25 is inserted into the waist-shaped hole 20, the distance between the hinging points of the first sliding pin 23 and the swing arm 5 on the upper sand box 2 is defined as L1, the distance between the hinging points of the second sliding pin 25 and the swing arm 5 on the upper sand box 2 is defined as L2, L2 is greater than L1, so that the stroke of the vertical movement of the driving rod 13 is smaller than the stroke of the vertical movement of the floating rod 26, and further, when the upper sand mold 7 moves up and down with a small amplitude, the vertical movement amplitude of the floating part 24 is large, so as to ensure that the metal liquid forms a flowing state in the flange cavity, or in other words, the metal liquid has a large flow speed in the flange cavity.

[0041] The working principle of the embodiment is as follows:

[0042] The external electric hoist or hydraulic cylinder drives the upper sand box 2 to move downward, so that the bottom surface of the upper sand box 2 abuts against the top surface of the lower sand box 1, when abutting, the abutting surfaces of the upper sand box 2 and the lower sand box 1 have a sealing effect, in addition, the cylinder rod of the extrusion cylinder 4 is shortened, under the action of the elastic abutting force of the reset spring 18 on the connecting block 17, the connecting block 17 drives the upper sand mold 7 to move upward, so that the upper sand mold 7 moves away from the lower sand mold 9, so that the annular flange 10 slides in the first cavity 21, when sliding, the upper end surface of the annular flange 10 and the inner wall of the first cavity 21 form a ring-shaped buffer cavity 12, in addition, in the embodiment, the connecting block 17 can be arranged on the diametrically opposite sides of the periphery of the upper sand mold 7, so that when the elastic potential energy of the two reset springs 18 is released, the upper sand mold 7 can stably move upward;

[0043] The worker then pours the ladle, so that the metal liquid enters the pouring gate 6, then enters the metal pipe from the pouring gate 6, then enters the riser, and then enters the flange cavity and the buffer cavity 12, so that the total amount of metal liquid in the buffer cavity 12 and the flange cavity is greater than the total amount of metal liquid required for the conventional technology to manufacture a stainless steel flange. After pouring is completed, an external plug or other closing device is used to close the pouring gate 6, but the pouring gate 6 is kept a certain degree of air permeability, that is, the gap between the inner wall of the pouring gate 6 and the surface of the closing device or plug can allow gas to pass through. Then the cylinder rod of the extrusion cylinder 4 is elongated, thereby generating a downward pushing force on the upper sand mold 7, so that the upper sand mold 7 moves downward. When the upper sand mold 7 moves downward, the upper end surface of the annular flange 10 gradually approaches the inner wall of the first cavity 21, thereby reducing the longitudinal width dimension of the buffer cavity 12, until the upper end surface of the annular flange 10 and the inner wall of the first cavity 21 abut. At this time, the disc cavity 14 and the second cavity 11 together form the flange cavity, and the longitudinal distance between the opposite surfaces of the first cavity 21 and the second cavity 11 is consistent with the thickness dimension of the stainless steel flange disc-shaped part. In addition, after the plurality of hole cores 19 are poured, disc holes are formed on the end surface of the stainless steel flange disc-shaped part. In addition, the second cavity 11 and the column core 8 form the stainless steel flange tubular part, and the column core 8 forms the center hole of the stainless steel flange;

[0044] When the upper sand mold 7 moves in the direction of the lower sand mold 9, the metal liquid in the original buffer cavity 12 will be extruded into the flange cavity. In addition, when the upper sand mold 7 moves downward, the driving rod 13 will also move downward, which will cause the first sliding pin 23 to slide in the waist-shaped hole 20 and cause the swing arm 5 to swing downward along the hinge of the upper sand box 2. Since L2 is greater than L1, the floating rod 26 also moves downward. When the floating rod 26 moves downward, the downward movement stroke is greater than the downward movement stroke of the driving rod 13, so the floating part 24 will move downward in the containing cavity 22 and extrude the metal liquid in the containing cavity 22 into the flange cavity. Since the amount of metal liquid on the side of the flange cavity away from the riser is greater than the amount of metal liquid on the other side of the flange cavity, the metal liquid on this side will flow in the direction of the riser at a relatively large flow rate, which can smoothly drive the gas bubbles in the flange cavity away from the riser to the riser. Since the pouring gate 6 is provided with a closing device, the metal liquid is not easy to escape, but the gas can escape from the gap between the pouring gate 6 and the closing device, so that the gas bubbles in the flange cavity can be driven out;

[0045] After pouring, after cooling, start the electric hoist or hydraulic cylinder, and then drive the upper sand box 2 to move upward, when the upper sand box 2 moves upward, the upper sand box 2 and the lower sand box 1 move away from each other, after moving away from each other, the elastic potential energy accumulated by the reset spring 18 is released, and drives the connecting block 17 to move upward, when moving upward, the upper sand mold 7 will move upward, and then the column core 8 and the hole core 19 are separated from the poured stainless steel flange, in addition, the upper sand mold 7 and the lower sand mold 9 can also be taken out and damaged, so that the poured stainless steel flange is separated from the upper sand mold 7 and the lower sand mold 9, to complete the unloading, then the new upper sand mold 7 and the lower sand mold 9 are assembled in the upper mounting cavity of the upper sand box 2 and the lower mounting cavity of the lower sand box 1 respectively, and the reset spring 18 is in contact with the surface of the connecting block 17 of the new upper sand mold 7, and then the next pouring and casting forming operation can be carried out.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A stainless steel flange casting apparatus comprising an upper sand box (2) and a lower sand box (1), characterized in that, Also include: The lower sand mold (9) is embedded in the top surface of the lower sand box (1), and the top surface of the lower sand mold (9) is provided with a recessed disc cavity (14), and the inner wall of the disc cavity (14) is provided with an annular flange (10) protruding upward of the lower sand mold (9); The upper sand mold (7) is slidably embedded in the bottom surface of the upper sand box (2), and the bottom surface of the upper sand mold (7) is provided with a first mold cavity (21) for the annular flange (10) to pass freely, and the inner wall of the first mold cavity (21) is provided with a recessed second mold cavity (11), and the inner wall of the second mold cavity (11) is fixedly connected with a columnar core (8), and the first mold cavity (21) and the upper surface of the annular flange (10) form an annular buffer cavity (12), and the top of the upper sand box (2) is provided with a pouring gate (6), and the top of the upper sand mold (7) is provided with a riser, and the riser and the pouring gate (6) are connected through. The lifting unit is arranged in the upper sand box (2), and is used for driving the vertical movement of the upper sand mold (7), so that the disc cavity (14) and the second mold cavity (11) form a flange cavity after the annular flange (10) and the surface of the first mold cavity (21) abut. The upper sand mold (7) is provided with a containing cavity (22) penetrating the first mold cavity (21), and the floating part (24) is slidably fitted in the containing cavity (22). The floating unit is used to drive the floating part (24) to move in the same direction as the movement direction of the upper sand mold (7) when the upper sand mold (7) moves. The floating unit includes a driving rod (13) vertically fixed to the floating part (24), and the driving rod (13) slidably penetrates the top of the upper sand box (2), and the upper sand mold (7) is provided with a driving assembly, and the driving assembly is used to drive the driving rod (13) to move synchronously and in the same direction when the upper sand mold (7) moves. The driving assembly includes a swing arm (5) hinged to the top of the upper sand box (2), and the upper end of the driving rod (13) is fixedly connected with a first sliding pin (23), and the swing arm (5) is provided with a waist-shaped hole (20) for inserting the first sliding pin (23), and the top of the upper sand mold (7) is vertically fixed with a floating rod (26), and the floating rod (26) slidably penetrates the upper sand box (2) and is fixedly connected with a second sliding pin (25), and the second sliding pin (25) is inserted into the waist-shaped hole (20).

2. The stainless steel flange casting apparatus according to claim 1, characterized by, The distance between the first sliding pin (23) and the hinge point of the swing arm (5) on the upper sand box (2) is defined as L1, and the distance between the second sliding pin (25) and the hinge point of the swing arm (5) on the upper sand box (2) is defined as L2, and L2 is less than L1.

3. The stainless steel flange casting apparatus according to claim 1, wherein The upper sand box (2) and the lower sand box (1) are correspondingly fixed with ear blocks, and the adjacent two ear blocks are slidably provided with a guide column (3).

4. The stainless steel flange casting apparatus according to claim 1, wherein The inner bottom wall of the disc cavity (14) is provided with an empty slot for the columnar core (8) to pass freely. The upper sand mold (7) is vertically fixedly provided with a plurality of hole cores (19), and the hole cores (19) slidably penetrate the lower sand mold (9).

5. The stainless steel flange casting apparatus according to claim 1, wherein The lifting unit comprises a pressing cylinder (4) mounted on the top of the upper sand box (2), the cylinder rod of the pressing cylinder (4) penetrates into the upper sand box (2) and the end thereof abuts against the top surface of the upper sand mold (7), and the lower sand box (1) is provided with a reset assembly which has an upward elastic abutting force on the upper sand mold (7).

6. The stainless steel flange casting apparatus according to claim 5, wherein The reset assembly comprises a connecting block (17) fixed to the periphery of the upper sand mold (7), the opposite surfaces of the upper sand box (2) and the lower sand box (1) are respectively provided with a first through slot (16) and a second through slot (15) for the free passing of the connecting block (17), a reset spring (18) is vertically mounted in the second through slot (15), and the elastic force direction of the reset spring (18) is elastically abutted against the connecting block (17) and the inner bottom wall of the second through slot (15) respectively.

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