A ductile iron casting casting equipment and heat treatment process

Abstract

The invention discloses a ductile iron casting casting equipment and a heat treatment process. The structure comprises a sand mold frame, an interlayer group, a sand placing group, a positioning movable frame, an auxiliary frame and a pipe frame. The interlayer group is installed on the outer surface of the sand mold frame. The sand placing group is assembled in a groove of the positioning movable frame for controlled movement. The sand placing group comprises a stretching rod, a power control box, a joint, a telescopic tube, a spring tube, an outer pressure plate, a screen, a scraper, a pressure box, a force frame, a rebound body, a limit frame, a moving block and a limit rod. The stretching rod is embedded in the power control box for power coordination. When the sand is in a state of agglomeration and adhesion, the agglomerated sand is intercepted during the conveying process through the screen. The intercepted sand is loosely scraped by the rotation of the scraper. The rotation of the scraper can assist the sand to pass through the screen more smoothly, so that it can be loosely placed in the sand mold frame, so as to avoid the agglomerated sand affecting the subsequent compaction and forming independent cracks.

Description

Technical Field

[0001] The invention belongs to the field of casting, and more specifically, particularly relates to a ductile iron casting casting device and a heat treatment process. Background Art

[0002] Ductile iron casting equipment is mainly used to produce ductile iron castings, which have high strength, high toughness and good wear resistance. The casting process mainly includes smelting, molding, pouring, sand dropping and testing, etc. The molding used for casting is a cavity made to obtain the required casting shape. By pouring the molten metal into this cavity, a casting consistent with the shape of the cavity can be obtained.

[0003] Based on the above findings, the existing casting equipment has the following main shortcomings, such as:

[0004] When casting sand molds, sand is placed on the finished mold shell through a large hose. A large amount of sand is input, covering the membrane shell for compaction to form a sand mold. However, since the sand is stored in piles and transported through a large hose, the sand with lumps and adhesions inside is also transported and introduced. After compaction, due to the different agglomerate pressures, cracks are more likely to appear during the pouring process, thus affecting the pouring effect.

[0005] Therefore need to propose a kind of ductile iron casting casting equipment and heat treatment process. Summary of the invention

[0006] In order to solve the above technical problems, the purpose and effect of the ductile iron casting casting equipment and heat treatment process of the present invention are achieved by the following specific technical means:

[0007] Its structure includes a sand mold frame, an interlayer group, a sand placing group, a positioning movable frame, an auxiliary frame, and a pipe rack. The interlayer group is installed on the outer surface of the sand mold frame, the sand placing group is assembled in the positioning movable frame slot for controlled movement, the auxiliary frame can be installed and placed on the upper surface of the sand mold frame, and the pipe rack and the auxiliary frame are an integrated structure.

[0008] The sand release group includes an extension rod, a power control box, a connector, a telescopic tube, a spring tube, an outer pressure plate, a screen, a scraper, a press box, a force frame, a rebound body, a limit frame, a moving block, and a limit rod. The extension rod is embedded in the power control box for power coordination. The connector and the telescopic tube are an integrated structure. The outer pressure plate is fixed to the bottom of the spring tube and is flush with the bottom of the press box. The screen is installed on the bottom surface of the press box in a flush state. The scraper is installed on the upper end of the screen. The rebound body is installed between the force frame and the moving block. The limit frame is fixed to the outer surface of the moving block. The limit rod passes through the limit frame and is connected to the press box. The limit rod is fixed between the force frame and the press box.

[0009] The power control box is used to control the extension and retraction of the extension rod and the overall translation of the sand release group. The connector is connected to the output port of the container that stores and controls the output of sand. The telescopic tube can be extended and retracted according to the movement of the pressure box. The scraper blade is a curved arc blade body. During the sand transportation process, it will rotate through its flow force to assist the sand to pass through the screen more smoothly. The screen will intercept the agglomerated sand, which will be crushed and output after being broken up by the rotation of the scraper blade. The limiting auxiliary limiting rod of the limiting frame can move vertically. The outer pressure plate can assist the pressure box in compacting the sand by retracting the exhaust column inward, and the moving block is embedded in the inner groove of the column bracket for sliding.

[0010] As a further improvement of the present invention, the positioning moving frame includes a column bracket, a power control group, and a row bracket. The upper end of the column bracket is embedded in the groove of the row bracket for movement. The power control group performs power control on the row bracket. The sand release group on the column bracket can change the position of the column when it moves. The column bracket drives the sand release group to move along the row bracket to change the position of the row. Both sides of the power control box are embedded in the groove of the column bracket for movement.

[0011] As a further improvement of the present invention, the partition group includes a winding box, a limiting opening, a partition bar, a slot, a tow rod, and a fixed box. The limiting opening and the winding box are an integrated structure. The partition bar is connected between the inside of the winding box and the tow rod. The slot and the fixed box are an integrated structure. The winding box and the fixed box are fixed to the outer surface of the sand mold frame. The partition bar is made of soft rubber material. The partition bar is composed of separate long strips arranged evenly. Magnetic strips are installed on the left and right surfaces to have a magnetic attraction effect. After the partition bar loses the snapping force of the slot, it will automatically roll up into the winding box, and the tow rod is limited and fixed by the limiting opening to facilitate subsequent pulling out.

[0012] As a further improvement of the present invention, the sand mold frame includes an outer shell, a grid, a placement grid, a vibration group, a vibration-transmitting body, and a hanging rod. The grid and the outer shell are an integrated structure. The placement grid is installed above the vibration group. The vibration-transmitting body is connected to the vibration group. The hanging rod is fixed to the outer surface of the outer shell. The vibration group controls the vibration-transmitting body and the vibration group to perform micro-vibration so that the sand can be more compact. The outer shell and the vibration-transmitting body are equipped with a buffer layer to prevent a hard collision between the two during the micro-vibration process. The placement grid seals the space at the lower end of the outer shell and will move synchronously when the outer shell is micro-vibrated.

[0013] As a further improvement of the present invention, the hanging rod auxiliary crane is more convenient when lifting the outer shell, the shape of the square corresponds to the square of the auxiliary frame, the placement grid is used to place the finished mold shell and fix it to the finished mold shell with adhesive, and the hanging rod is provided with two on both sides of the outer shell surface.

[0014] As a further improvement of the present invention, the ductile iron casting casting equipment described herein has the following ductile iron casting casting heat treatment process steps:

[0015] Step 1: Melt iron and other alloy elements, adjust the composition and temperature of the molten metal, control the melting process, add spheroidizer to the molten metal, and transform the graphite in the molten metal from flake to spherical.

[0016] Step 2: Use sand to make a casting mold, place the finished model on the placement grid, and then fill the inside of the shell with sand. After the filled sand is compacted and formed, the shell is lifted as a whole by a hanging rod to separate the sand from the finished model below;

[0017] Step 3: After the shell is shaped, the required core is placed and fixed inside, and the liquid melted in step 1 is poured into the sand mold, and then cooled. The cooling equipment is used to prevent defects such as heat marks and deformation;

[0018] Step 4: After cooling in step 3, clean the sand layer, pouring riser and other redundant parts on the surface of the casting;

[0019] Step 5: After the casting is completed, it is inspected and tested for quality.

[0020] The sand placing group is located on the column bracket and the row bracket and is controlled by the background system, and moves in point-controlled manner according to the grids of the grids, so that it can be more accurately controlled in place.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] First, when the sand is in a clumping state, the clumped sand is intercepted during the conveying process through the screen, and the intercepted sand is loosened and scraped by the rotation of the scraper. The rotation of the scraper can help the sand pass through the screen more smoothly, so that it can be loosely placed inside the sand mold frame, avoiding the clumping of sand affecting the subsequent compaction and causing independent cracks.

[0023] Secondly, the sand placing group is controlled by the column bracket and the row bracket to move in rows and columns. The shape of the pressing box corresponds to the shape of the grid, so that the pressing box can be point-to-point filled and compacted with the grid through background control to avoid uneven sand pressure.

[0024] Third, when the sand mold frame needs to be compacted, the partition bars should be unfolded first. This can protect the bottom of the press box during the compaction process and prevent the mesh shape of the screen from loosening the surface sand during the compaction process.

[0025] Fourthly, when the sand filling amount reaches a certain level, the micro-vibration mode of the vibration group is turned on in the background, so that the sand filled in the sand mold frame moves down through vibration and becomes more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic structural diagram of a ductile iron casting casting device.

[0027] Figure 2 The figure is a schematic diagram of the cross-sectional structure of a sand placing group according to the present invention.

[0028] Figure 3 The figure is a schematic structural diagram of a sand placing group according to the present invention.

[0029] Figure 4 The figure is a schematic structural diagram of a positioning movable frame of the present invention.

[0030] Figure 5 The figure is a schematic structural diagram of an interlayer group of the present invention.

[0031] Figure 6 The figure is a schematic diagram of the cross-sectional structure of a sand mold frame of the present invention.

[0032] Figure 7 The present invention is a structural schematic diagram of a sand mold frame and an auxiliary frame.

[0033] Figure 8 The present invention is a schematic diagram of the process flow of a ductile iron casting heat treatment process.

[0034] In the figure: sand mold frame -1, interlayer group -2, sand placing group -3, positioning moving frame -4, auxiliary frame -5, pipe rack -6, extension rod -31, power control box -32, joint -33, telescopic tube -34, spring tube -35, outer pressure plate -36, screen -37, scraper -38, pressure box -39, force frame -310, rebound body -311, limit frame -312, moving block -313, limit rod -314, column bracket -41, power control group -42, row bracket -43, retracting box -21, limit opening -22, partition bar -23, card slot -24, drag rod -25, fixed box -26, shell -11, grid -12, placement grid -13, vibration group -14, vibration transmission body -15, hanging rod -16. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings:

[0036] Embodiment 1: As attached Figure 1 To Attachment Figure 5 As shown:

[0037] The present invention provides a ductile iron casting casting equipment and a heat treatment process, wherein the structure includes a sand mold frame 1, an interlayer group 2, a sand placing group 3, a positioning and moving frame 4, an auxiliary frame 5, and a pipe rack 6, wherein the interlayer group 2 is installed on the outer surface of the sand mold frame 1, the sand placing group 3 is assembled in a groove of the positioning and moving frame 4 for controlled movement, the auxiliary frame 5 can be installed and placed on the upper surface of the sand mold frame 1, and the pipe rack 6 and the auxiliary frame 5 are an integrated structure;

[0038] The sand release group 3 includes a stretch rod 31, a power control box 32, a connector 33, a telescopic tube 34, a spring tube 35, an outer pressure plate 36, a screen 37, a scraper 38, a pressure box 39, a force frame 310, a rebound body 311, a limit frame 312, a moving block 313, and a limit rod 314. The stretch rod 31 is embedded in the power control box 32 for power coordination. The connector 33 and the telescopic tube 34 are an integrated structure. The outer pressure plate 36 is fixed to the spring tube The bottom of the press box 35 is flush with the bottom of the press box 39, the screen 37 is installed on the bottom surface of the press box 39 in a flush state, the scraper 38 is installed on the upper end of the screen 37, the resilient body 311 is installed between the force frame 310 and the moving block 313, the limiting frame 312 is fixed to the outer surface of the moving block 313, the limiting rod 314 penetrates the limiting frame 312 and is connected to the press box 39, and the limiting rod 314 is fixed between the force frame 310 and the press box 39;

[0039] The power control box 32 is used to control the extension and retraction of the extension rod 31 and the overall translation of the sand release group 3. The connector 33 is connected to the output port of the container for storing and controlling the output of sand. The telescopic tube 34 can be extended and retracted according to the movement of the pressure box 39. The scraper 38 is a curved arc blade body. During the sand transportation process, it will rotate through its flow force to assist the sand to pass through the screen 37 more smoothly. The screen 37 will intercept the agglomerated sand, which will be crushed and output after being broken up by the rotation of the scraper 38. The limiting auxiliary limiting rod 314 of the limiting frame 312 can move vertically. The outer pressure plate 36 can assist the pressure box 39 in compacting the sand by retracting the exhaust column. The moving block 313 is embedded in the inner groove of the column bracket 41 for sliding. The pressure box 39 matches the shape of the grid 12 and can better compact the sand.

[0040] Among them, the positioning moving frame 4 includes a column bracket 41, a power control group 42, and a row bracket 43. The upper end of the column bracket 41 is embedded in the groove of the row bracket 43 for movement. The power control group 42 performs power control on the row bracket 43. The sand release group 3 on the column bracket 41 can change the position of the column when it moves. The column bracket 41 drives the sand release group 3 to move along the row bracket 43 to change the position of the row. The two sides of the power control box 32 are embedded in the groove of the column bracket 41 for movement. There are a total of sixteen squares in the square 12, and each square is a point aligned with the press box 39.

[0041] Among them, the interlayer group 2 includes a reeling box 21, a limiting opening 22, a partition bar 23, a card slot 24, a towing rod 25, and a fixed box 26. The limiting opening 22 and the reeling box 21 are an integrated structure. The partition bar 23 is connected between the inside of the reeling box 21 and the towing rod 25. The card slot 24 and the fixed box 26 are an integrated structure. The reeling box 21 and the fixed box 26 are fixed to the outer surface of the sand mold frame 1. The partition bar 23 is made of soft rubber material. The partition bar 23 is composed of separate long strips arranged evenly. The left and right sides of the partition bar 23 are equipped with magnetic strips to have a magnetic effect. After losing the snapping force of the card slot 24, the partition bar 23 will automatically be reeled into the inside of the reeling box 21, and the towing rod 25 is limited and fixed by the limiting opening 22 to facilitate subsequent pulling out. After being pulled out, the partition bar 23 can cover the entire upper surface of the sand mold frame 1.

[0042] The specific usage and function of this embodiment are as follows:

[0043] In the present invention, the connector 33 is connected to the interface of the conveying box where the sand is stored, and its partition bar 23 is in a retracted state. The finished mold shell is placed in the sand mold frame 1, and the auxiliary frame 5 is aligned with the upper surface of the sand mold frame 1 for placement, and its column is placed in the pipe rack 6 for fixing, and the open conveying of the sand is controlled by the background operating system, so that the sand is transported to the outside of the screen 37 through the telescopic tube 34. During the flow of sand, the scraper blade 38 will be subjected to the impact force to rotate, and the sand inside the screen 37 is scraped to assist the sand to loosely pass through the screen 37. The power control box 32 controls the sand placing group 3 to move and adjust along the column bracket 41 as a whole, and align with the grid point position in the sand mold frame 1. The column bracket 41 moves and adjusts the change of the row and column along the row bracket 43 through the control of the power control group 42, so that the sand can be evenly filled in each grid. When the sand is filled in sufficient amount, the auxiliary frame 5 is removed, so that the column is left between the sand. The spacer 23 originally rolled up in the winding box 21 is extended outward by pulling the drag rod 25, and the drag rod 25 is stuck on the card slot 24 for fixation. The spacer 23 is composed of a plurality of arranged strips, and when encountering the exhaust column, it will be separated, and the column will be wrapped with the magnetic attraction on both sides for magnetic adhesion. After the spacer 23 is covered, the background control power control box 32 controls the extension rod 31 to extend and retract, so that its force frame 310 is forced to push the limit rod 314 and the pressure box 39, and the limit rod 314 will move vertically along the limit frame 312, and the telescopic tube 34 will be stretched, so that the pressure box 39 compacts the squares in the sand mold frame 1, and the position with the column will squeeze the outer pressure plate 36 to shrink into the spring tube 35 to prevent affecting the compaction operation of the pressure box 39, and the sand placing group 3 moves in rows and columns to compact the sixteen squares in turn, so that the sand is fixed and formed to replicate its mold shell.

[0044] Embodiment 2: As attached Figure 6 To Attachment Figure 8 As shown:

[0045] Among them, the sand mold frame 1 includes an outer shell 11, a grid 12, a placement grid 13, a vibration group 14, a vibration-transmitting body 15, and a hanging rod 16. The grid 12 and the outer shell 11 are an integrated structure. The placement grid 13 is installed above the vibration group 14. The vibration-transmitting body 15 is connected to the vibration group 14. The hanging rod 16 is fixed to the outer surface of the outer shell 11. The vibration group 14 controls the vibration-transmitting body 15 and the vibration group 14 to perform micro-vibration, so that the sand can be more compact. The outer shell 11 and the vibration-transmitting body 15 are equipped with a buffer layer to prevent a hard collision between the two during the micro-vibration process. The placement grid 13 performs a spatial seal on the lower end of the outer shell 11, and will move synchronously when the outer shell 11 is micro-vibrated. The grid 12 has a total of sixteen grids, which can make the compacted sand have a certain support surface to be more compact.

[0046] Among them, the hanging rod 16 assists the crane in lifting the outer shell 11 more conveniently, the shape of the square 12 corresponds to the square of the auxiliary frame 5, the placement grid 13 is used to place the finished mold shell and fix it to the finished mold shell by adhesive, and the hanging rod 16 is provided with two on both sides of the surface of the outer shell 11, and the position supported by the pipe rack 6 corresponds to the outer pressure plate 36.

[0047] Among them, the ductile iron casting casting equipment described above has the following ductile iron casting casting heat treatment process steps:

[0048] Step 1: Melt iron and other alloy elements, adjust the composition and temperature of the molten metal, control the melting process, add spheroidizer to the molten metal, and transform the graphite in the molten metal from flake to spherical.

[0049] Step 2: Make a casting mold with sand, place the finished model on the placement grid 13, and then fill the interior of the shell 11 with sand. After the filled sand is compacted and formed, the shell 11 is hoisted as a whole by the hanging rod 16 to separate the sand from the finished model below;

[0050] Step 3: After the shell 11 is shaped, the required core is placed and fixed inside, and the liquid melted in step 1 is poured into the sand mold, and then cooled, and the cooling equipment is used to prevent defects such as heat marks and deformation;

[0051] Step 4: After cooling in step 3, clean the sand layer, pouring riser and other redundant parts on the surface of the casting;

[0052] Step 5: After the casting is completed, it is inspected and tested for quality.

[0053] The sand placing group 3 is on the column bracket 41 and the row bracket 43 and is controlled by the background system to move in accordance with the grids of the grid 12 so that it can be more accurately controlled in place. The auxiliary frame 5 can be disassembled after the exhaust column is fixed.

[0054] The specific usage and function of this embodiment are as follows:

[0055] In the present invention, the finished mold shell is placed on the placement grid 13 and fixed by adhesive. After the sand is evenly introduced according to the grids of the grids 12, the micro-vibration mode of the vibration group 14 is started through the background system. The vibration group 14 will transmit the vibration force to its outer shell 11 through the vibration transmitting body 15. The placement grid 13 will shake with the outer shell 11, and its sand will move down through the micro-vibration mode to fill the gap and make it more compact. When the sand moves down and is compacted, sand can be introduced again on the top to fill it completely. The grid 12 is divided into sixteen grids, so that the sand pressure is uniform and more compact. After the sand inside the outer shell 11 is filled, it is hung on the hanging rod 16 by the rope of the crane, and it is lifted and moved to the next step for finalization.

[0056] Utilizing the technical solution of the present invention, or those skilled in the art designing similar technical solutions inspired by the technical solution of the present invention to achieve the above-mentioned technical effects, all fall within the protection scope of the present invention.

Claims

1. A ductile iron casting casting device, comprising a sand mold frame (1), a layer group (2), a sand placing group (3), a positioning movable frame (4), an auxiliary frame (5), and a pipe rack (6), wherein the layer group (2) is mounted on the outer surface of the sand mold frame (1), the sand placing group (3) is assembled in a groove of the positioning movable frame (4) for controlled movement, the auxiliary frame (5) can be mounted and placed on the upper surface of the sand mold frame (1), and the pipe rack (6) and the auxiliary frame (5) are an integrated structure, characterized in that: The sand release group (3) comprises a stretch rod (31), a power control box (32), a connector (33), a telescopic tube (34), a spring tube (35), an outer pressure plate (36), a screen (37), a scraper (38), a pressure box (39), a force frame (310), a rebound body (311), a limit frame (312), a moving block (313), and a limit rod (314). The stretch rod (31) is embedded in the power control box (32) for power coordination. The connector (33) and the telescopic tube (34) are an integrated structure. The outer pressure plate (36) is fixed to The bottom of the spring tube (35) is flush with the bottom of the press box (39), the screen (37) is installed on the bottom surface of the press box (39) in a flush state, the scraper (38) is installed on the upper end of the screen (37), the resilient body (311) is installed between the force-bearing frame (310) and the moving block (313), the limiting frame (312) is fixed to the outer surface of the moving block (313), the limiting rod (314) passes through the limiting frame (312) and is connected to the press box (39), and the limiting rod (314) is fixed between the force-bearing frame (310) and the press box (39); The power control box (32) is used to control the extension and retraction of the extension rod (31) and the overall translation of the sand discharge group (3); the connector (33) is connected to the output port of the container for storing and controlling the output of sand; the telescopic tube (34) can be extended and retracted according to the movement of the pressure box (39); the scraper (38) is a curved arc-shaped blade body, which will rotate by its flow force during the sand transportation process to assist the sand to pass through the screen (37) more smoothly; the screen (37) will intercept the agglomerated sand, which will be crushed and output after being broken up by the rotation of the scraper (38); the limit auxiliary limit rod (314) of the limit frame (312) can move vertically; the outer pressure plate (36) can assist the pressure box (39) in compacting the sand by retracting the exhaust column inward; The interlayer group (2) comprises a reeling box (21), a limiting opening (22), a spacer (23), a slot (24), a towing rod (25), and a fixed box (26); the limiting opening (22) and the reeling box (21) are an integrated structure; the spacer (23) is connected between the inside of the reeling box (21) and the towing rod (25); the slot (24) and the fixed box (26) are an integrated structure; the reeling box (21) and the fixed box (26) are fixed to the outer surface of the sand mold frame (1); the spacer (23) is made of soft rubber material; the spacer (23) is composed of individual long strips evenly arranged; and magnetic strips are mounted on the left and right surfaces of the spacer to have a magnetic attraction effect.

2. A ductile iron casting casting equipment according to claim 1, characterized in that: The positioning moving frame (4) comprises a column support (41), a power control group (42), and a row support (43). The upper end of the column support (41) is embedded in a groove of the row support (43) for movement. The power control group (42) performs power control on the row support (43). The sand placing group (3) on the column support (41) can change the position of the column when it moves. The column support (41) drives the sand placing group (3) to move along the row support (43) to change the position of the row.

3. A ductile iron casting casting equipment according to claim 1, characterized in that: The sand mold frame (1) comprises an outer shell (11), a grid (12), a placement grid (13), a vibration group (14), a vibration-transmitting body (15), and a hanging rod (16); the grid (12) and the outer shell (11) are an integrated structure; the placement grid (13) is installed above the vibration group (14); the vibration-transmitting body (15) is connected to the vibration group (14); the hanging rod (16) is fixed to the outer surface of the outer shell (11); the vibration group (14) controls the vibration-transmitting body (15) and the vibration group (14) to perform micro-vibration, so that the sand can be more compact; the outer shell (11) and the vibration-transmitting body (15) are equipped with a buffer layer to prevent the two from generating a hard collision during the micro-vibration process.

4. A ductile iron casting casting equipment according to claim 3, characterized in that: The hanging rod (16) assists the crane in lifting the outer shell (11) more conveniently. The shape of the square grid (12) corresponds to the square grid of the auxiliary frame (5). The placement grid (13) is used to place the finished mold shell and fix it to the finished mold shell by adhesive.

5. A ductile iron casting heat treatment process, characterized in that: The ductile iron casting casting equipment according to any one of claims 1 to 4 is used, and the ductile iron casting casting heat treatment process steps are as follows: Step 1: Melt iron and other alloy elements, adjust the composition and temperature of the molten metal, control the melting process, add spheroidizer to the molten metal, and transform the graphite in the molten metal from flake to spherical. Step 2: Use sand to make a casting mold, place the finished model on the placement grid (13), and then fill the interior of the shell (11) with sand. After the filled sand is compacted and formed, the shell (11) is lifted as a whole by the hanging rod (16) so that the sand is separated from the finished model below; Step 3: After the shell (11) is shaped, the required core is placed and fixed inside, and the liquid melted in step 1 is poured into the sand mold, and then cooled, and the cooling equipment is used to prevent heat marks and deformation defects; Step 4: After cooling in step 3, clean the sand layer, pouring riser and other redundant parts on the surface of the casting; Step 5: After the casting is completed, it is inspected and tested for quality.

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