A cold core box forming sand core mold and its forming inspection method

Abstract

A cold box method sand core mold and a molding inspection method thereof, a cold box method sand core mold, comprising an upper mold plate (1), a lower mold plate (2), a group of draw blocks (3), a group of draw block driving cylinders (4), a sand shooting plate (5), a lower mold foot (6), an upper top plate (7), a blowing plate (8) and a lower top plate (9); a cold box method sand core mold molding inspection method, characterized in that the molding steps are as follows: ① mold closing; ② sand shooting, the sand shooting pressure is (4) bar, and the sand shooting time is (3) s; ③ curing, triethylamine gas is used to cure the sand core, and the blowing time is (70) s; ④ exhaust; ⑤ demoulding; ⑥ quality inspection; the advantages of the present invention are: high production efficiency, energy saving, improved sand core dimensional stability, and extended mold service life.

Description

Technical Field

[0001] The invention relates to the technical field of sand core molding, and in particular to a cold core box molding sand core mold and a molding inspection method thereof. Background Art

[0002] Existing sand core forming processes can be classified into conventional sand cores, self-hardening sand cores, hot core box sand cores, shell cores, etc. Such processes require a long time, high energy consumption, and poor dimensional stability of the sand cores. In order to improve production efficiency and production quality, a cold core box forming process has emerged. Most of the existing cold core box forming processes use alkaline phenolic resin sand blowing methyl formate cold core box method, water glass sand blowing carbon dioxide cold core box method, water glass sand blowing methyl formate cold core box method, modified silicate sand blowing carbon dioxide / compressed gas composite blowing method, alkaline phenolic resin sand blowing carbon dioxide cold core box method, and two-component alkaline phenolic resin sand blowing carbon dioxide cold core box method. Resins and catalysts are relatively expensive and flammable, and are highly sensitive to temperature. In particular, polyisocyanate is highly sensitive to water, and the storage time of core sand is limited. Summary of the invention

[0003] The purpose of the present invention is to provide a cold box sand core mold and a molding inspection method thereof to overcome the above-mentioned deficiencies.

[0004] A cold core box method sand core mold of the present invention comprises an upper mold plate, a lower mold plate, a group of draw blocks, a group of draw block driving cylinders, a sand shooting plate, a lower mold foot, an upper top plate, an air blowing plate and a lower top plate, a sand core cavity is opened on the upper mold plate and the lower mold plate, a group of draw blocks is located in the sand core cavity, a group of draw block driving cylinders are respectively installed on both sides of the lower mold plate and drive the corresponding draw blocks to move, a group of nozzles are arranged on the sand shooting plate, and a group of sand shooting ports used in conjunction with the nozzles are opened on the upper mold plate;

[0005] A group of guide rods are provided on the upper top plate, a group of guide sleeves used in conjunction with the guide rods are provided on the blowing plate, the blowing plate is movably mounted on the guide rods of the upper top plate through a group of guide sleeves, a group of spring pull rods are provided on the blowing plate, and the upper top plate is tightened by a group of spring pull rods, a group of upper ejector rods are provided on the upper top plate, the upper ejector rods are hollow tubes with an opening at one end of the bottom, and a solidifying gas inlet is provided on the tube wall near the closed end, a group of upper ejector rod avoidance holes communicated with the sand shooting port are provided on the blowing plate, a blowing channel communicated with the upper ejector rod avoidance holes is also provided on the blowing plate, one end of the upper ejector rod passes through the blowing plate and is located in the sand shooting port of the upper template, a group of positioning guide sleeves used in conjunction with the guide rods of the upper top plate are provided on the upper template, a group of limit ejector rods used in conjunction with the guide rods of the upper top plate are provided on the lower template,

[0006] The lower template is fixed to the lower mold foot, and a group of lower ejector rods extending into the sand core cavity of the lower template are provided on the lower top plate, a group of guide rods are provided on the lower template, and a group of guide sleeves used in conjunction with the guide rods are provided on the lower top plate. The lower top plate is movably mounted on the guide rods of the lower template through the guide sleeves, and a group of ejector columns are provided at the bottom of the lower top plate; a group of exhaust holes communicating with the sand core cavity are opened on the lower template, and an exhaust valve communicating with the exhaust holes is provided on the lower mold foot.

[0007] A pair of hanging handles are provided on both sides of the lower mold foot, a group of sand shooting plate locking pins are provided on the top of the sand shooting plate, a group of limit blocks are provided at the bottom of the sand shooting plate, a group of core box locking pins are provided on the upper mold plate, and a pair of blowing plate locating pins are provided on the blowing plate.

[0008] The upper ejector rod is a hollow rod with openings at both ends, and an air hole communicating with the hollow rod is opened on the upper ejector plate. The diameter of the upper ejector rod is smaller than the diameter of the sand shooting port.

[0009] A group of positioning pins are arranged on the sandblasting plate, and a group of positioning seats used in conjunction with the positioning pins are arranged on the upper top plate.

[0010] A molding inspection method for a cold box molding sand core mold, characterized in that the molding steps are as follows:

[0011] ①Mold closing: a group of drawer block driving cylinders push the corresponding drawer block to the mold closing position, and the lower mold plate rises to close the mold with the upper mold plate;

[0012] ②Sand shooting, the upper top plate and the blowing plate are moved out synchronously. By default, the upper top plate and the blowing plate are tightened by a spring pull rod. The upper template and the lower template rise synchronously to the sand shooting plate for sand shooting. The nozzle shoots the core sand from the sand shooting port into the sand core cavity. The sand shooting pressure is 4 bar and the sand shooting time is 3 seconds.

[0013] ③ Curing. After the sand shooting is completed, the upper template and the lower template are synchronously lowered, the upper ejector plate and the air blowing plate are moved in together, and the upper template and the lower template are synchronously raised again to fit the air blowing plate. A set of guide rods of the upper ejector plate are inserted into the positioning guide sleeve of the upper template. When the air blowing plate fits the upper template, the limit ejector rods support a set of guide rods of the upper ejector plate, and lift the upper ejector plate upward for a distance, so that the spring of the spring pull rod is in a compressed state. The triethylamine gas enters the sand core cavity from the air blowing channel through the curing gas inlet of the upper ejector rod to cure the sand core. The blowing time is 70 s.

[0014] ④ Exhaust: After curing is completed, open the exhaust valve to exhaust the sand core cavity. The exhaust time is 3s;

[0015] ⑤ Demolding, after exhausting, the lower template descends, the limit ejector rod is separated from the guide rod of the upper ejector plate, and under the spring reaction force of the spring pull rod, the upper ejector plate follows the lower template and descends a certain distance synchronously, and the upper ejector plate pushes the upper ejector rod to eject the formed sand core onto the lower template, and then a group of extraction blocks drive the cylinder to pull a group of extraction blocks out of the mold, and the ejector column drives the lower ejector plate to rise, and the sand core in the lower template is ejected by the lower ejector rod, and the core is taken manually;

[0016] ⑥Quality inspection,

[0017] a. Establish a three-dimensional model of the sand core mold in the image processing system;

[0018] b. Use a laser scanner to scan the six-sided contours of the molded sand core, and input the scanned images into the image processing system to fit the sand core cavity of the three-dimensional model. The image processing system uses color scales to indicate the degree of fitting. The color scales are red, yellow, green and blue from top to bottom. The top red value is 1.0, the bottom blue value is -1.0, and the middle green value is 0.5 to -0.5;

[0019] c. Perform color sampling on the images corresponding to the six surfaces of the sand core in turn. There are multiple sampling points, and each sampling point corresponds to a surface of the sand core. Observe the sampling values. If the values ​​of each sampling point are displayed in green within the range of 0.5 to -0.5, it means that the fit is qualified.

[0020] The invention has the advantages of high production efficiency, energy saving, improved sand core dimensional stability and extended mold service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the sand core mold structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the internal structure of the sand core mold of the present invention.

[0024] Figure 3 It is a schematic diagram of the internal structure of the lower template of the present invention.

[0025] Figure 4 It is a schematic diagram of the connection between the upper top plate and the blowing plate of the present invention.

[0026] Figure 5 It is a schematic diagram of sampling at the top of the sand core of the present invention.

[0027] Figure 6 It is a schematic diagram of sampling at the bottom of the sand core of the present invention.

[0028] Figure 7 It is a schematic diagram of sampling on the left side of the sand core of the present invention.

[0029] Figure 8It is a schematic diagram of sampling on the right side of the sand core of the present invention.

[0030] Fig. 9 It is a schematic diagram of sampling from the front side of the sand core of the present invention.

[0031] Fig.10 It is a schematic diagram of sampling from the back side of the sand core of the present invention. DETAILED DESCRIPTION

[0032] As shown in the accompanying drawings, a cold core box method sand core mold of the present invention comprises an upper mold plate 1, a lower mold plate 2, a group of extraction blocks 3, a group of extraction block driving cylinders 4, a sand shooting plate 5, a lower mold foot 6, an upper top plate 7, a blowing plate 8 and a lower top plate 9, a sand core cavity is opened on the upper mold plate 1 and the lower mold plate 2, a group of extraction blocks 3 is located in the sand core cavity, a group of extraction block driving cylinders 4 are respectively installed on both sides of the lower mold plate 2, and drive the corresponding extraction blocks 3 to move, a group of nozzles 11 are provided on the sand shooting plate 5, and a group of sand shooting ports used in conjunction with the nozzles 11 are opened on the upper mold plate 1;

[0033] A group of guide rods are provided on the upper top plate 7, and a group of guide sleeves used in conjunction with the guide rods are provided on the blowing plate 8. The blowing plate 8 is movably mounted on the guide rods of the upper top plate 7 through a group of guide sleeves. A group of spring pull rods 14 are provided on the blowing plate 8, and are tightened with the upper top plate 7 through a group of spring pull rods 14. A group of upper push rods 10 are provided on the upper top plate 7. The upper push rods 10 are hollow tubes with an opening at one end of the bottom, and a solidifying gas inlet is provided on the tube wall near the closed end. A group of upper push rod avoidance holes communicating with the sand-shooting port are provided on the blowing plate 8, and a blowing channel 15 communicating with the upper push rod avoidance holes is also provided on the blowing plate 8. One end of the upper push rod 10 passes through the blowing plate 8 and is located in the sand-shooting port of the upper template 1. A group of positioning guide sleeves used in conjunction with the guide rods of the upper top plate 7 are provided on the upper template 1, and a group of limit push rods 31 used in conjunction with the guide rods of the upper top plate 7 are provided on the lower template 2.

[0034] The lower mold plate 2 is fixedly connected to the lower mold foot 6, and the lower top plate 9 is provided with a group of lower ejector rods 16 extending into the sand core cavity of the lower mold plate 2, and the lower mold plate 2 is provided with a group of guide rods, and the lower top plate 9 is provided with a group of guide sleeves used in conjunction with the guide rods. The lower top plate 9 is movably mounted on the guide rods of the lower mold plate 2 through the guide sleeves, and a group of ejector columns 17 are provided at the bottom of the lower top plate 9; a group of exhaust holes communicating with the sand core cavity are opened on the lower mold plate 2, and the lower mold foot 6 is provided with an exhaust valve 30 communicating with the exhaust holes.

[0035] A pair of hanging handles 20 are respectively provided on both sides of the lower mold foot 6, a group of sand blasting plate locking pins 21 are provided on the top of the sand blasting plate 5, a group of limit blocks 22 are provided at the bottom of the sand blasting plate 5, a group of core box locking pins 23 are provided on the upper mold plate 1, and a pair of blowing plate positioning pins 24 are provided on the blowing plate 8.

[0036] The upper push rod 10 is a hollow rod with openings at both ends. The upper top plate 7 is provided with air holes communicating with the hollow rod. The diameter of the upper push rod 10 is smaller than the diameter of the sand shooting port.

[0037] A group of positioning pins 25 are provided on the sandblasting plate 5 , and a group of positioning seats 26 used in conjunction with the positioning pins 25 are provided on the upper top plate 7 .

[0038] A molding inspection method for a cold box molding sand core mold, characterized in that the molding steps are as follows:

[0039] ① Mold closing: a group of drawer blocks drive cylinders 4 to push the corresponding drawer blocks 3 to the mold closing position, and the lower mold plate 2 rises to close the mold with the upper mold plate 1;

[0040] ② Sand shooting, the upper top plate 7 and the blowing plate 8 are moved out synchronously. By default, the upper top plate 7 and the blowing plate 8 are tightened by the spring pull rod 14. The upper template 1 and the lower template 2 rise synchronously to the sand shooting plate 5 for sand shooting. The nozzle 11 shoots the core sand from the sand shooting port into the sand core cavity. The sand shooting pressure is 4 bar and the sand shooting time is 3 seconds.

[0041] ③ Curing, after the sand shooting is completed, the upper template 1 and the lower template 2 are synchronously lowered, the upper top plate 7 and the blowing plate 8 are moved in together, and the upper template 1 and the lower template 2 are synchronously raised again to fit with the blowing plate 8, and a group of guide rods of the upper top plate 7 are inserted into the positioning guide sleeve of the upper template 1. When the blowing plate 8 fits with the upper template 1, the limiting push rod 31 pushes against a group of guide rods of the upper top plate 7, and pushes the upper top plate 7 upward for a distance, so that the spring of the spring pull rod 14 is in a compressed state, and the triethylamine gas enters the sand core cavity from the blowing channel 15 through the curing gas inlet of the upper push rod 10 to cure the sand core, and the blowing time is 70 s;

[0042] ④ Exhaust: After curing is completed, open the exhaust valve 30 to exhaust the sand core cavity for 3 seconds;

[0043] ⑤ Demolding, after exhausting, the lower template 2 descends, the limiting ejector rod 31 is separated from the guide rod of the upper ejector plate 7, and under the spring reaction force of the spring pull rod 14, the upper ejector plate 7 follows the lower template 2 and descends a distance synchronously, and the upper ejector plate 7 pushes the upper ejector rod 10 to eject the formed sand core onto the lower template 2, and then a group of extraction blocks drive the cylinder 4 to pull a group of extraction blocks 3 out of the mold, and the ejection column 17 drives the lower ejector plate 9 to rise, and the sand core in the lower template 2 is ejected by the lower ejector rod 16, and the core is taken manually;

[0044] ⑥Quality inspection,

[0045] a. Establish a three-dimensional model of the sand core mold in the image processing system;

[0046] b. Use a laser scanner to scan the six-sided contours of the molded sand core, and input the scanned images into the image processing system to fit the sand core cavity of the three-dimensional model. The image processing system uses color scales to indicate the degree of fitting. The color scales are red, yellow, green and blue from top to bottom. The top red value is 1.0, the bottom blue value is -1.0, and the middle green value is 0.5 to -0.5;

[0047] c. Perform color sampling on the images corresponding to the six surfaces of the sand core in turn. There are multiple sampling points, and each sampling point corresponds to a surface of the sand core. Observe the sampling values. If the values ​​of each sampling point are displayed in green within the range of 0.5 to -0.5, it means that the fit is qualified.

Claims

1. A cold box sand core mold, characterized in that It comprises an upper mold plate (1), a lower mold plate (2), a group of draw blocks (3), a group of draw block driving cylinders (4), a sand shooting plate (5), a lower mold foot (6), an upper top plate (7), an air blowing plate (8) and a lower top plate (9); a sand core cavity is formed on the upper mold plate (1) and the lower mold plate (2); a group of draw blocks (3) is located in the sand core cavity; a group of draw block driving cylinders (4) are respectively installed on both sides of the lower mold plate (2) and drive the corresponding draw blocks (3) to move; a group of nozzles (11) are provided on the sand shooting plate (5); and a group of sand shooting ports used in conjunction with the nozzles (11) are formed on the upper mold plate (1); The upper top plate (7) is provided with a group of guide rods, the blowing plate (8) is provided with a group of guide sleeves used in conjunction with the guide rods, the blowing plate (8) is movably mounted on the guide rods of the upper top plate (7) through the group of guide sleeves, the blowing plate (8) is provided with a group of spring pull rods (14), and is tightened with the upper top plate (7) through the group of spring pull rods (14), the upper top plate (7) is provided with a group of upper push rods (10), the upper push rods (10) are hollow tubes with one end open at the bottom, and a hole is opened on the tube wall near the closed end A solidifying gas inlet, a group of upper ejector avoidance holes communicating with the sand-shooting port are formed on the air blowing plate (8), an air blowing channel (15) communicating with the upper ejector avoidance holes is formed on the air blowing plate (8), one end of the upper ejector (10) passes through the air blowing plate (8) and is located in the sand-shooting port of the upper template (1), the upper template (1) is provided with a group of positioning guide sleeves used in conjunction with the guide rods of the upper ejector plate (7), the lower template (2) is provided with a group of limit ejector rods (31) used in conjunction with the guide rods of the upper ejector plate (7), The lower mold plate (2) is fixedly connected to the lower mold foot (6); a group of lower ejector rods (16) extending into the sand core cavity of the lower mold plate (2) are provided on the lower ejector plate (9); a group of guide rods are provided on the lower mold plate (2); a group of guide sleeves used in conjunction with the guide rods are provided on the lower ejector plate (9); the lower ejector plate (9) is movably mounted on the guide rods of the lower mold plate (2) through the guide sleeves; a group of ejector columns (17) are provided at the bottom of the lower ejector plate (9); a group of exhaust holes communicating with the sand core cavity are opened on the lower mold plate (2); and an exhaust valve (30) communicating with the exhaust holes is provided on the lower mold foot (6).

2. A cold box sand core mold according to claim 1, characterized in that A pair of hanging handles (20) are respectively provided on both sides of the lower mold foot (6), a group of sand blasting plate locking pins (21) are provided on the top of the sand blasting plate (5), a group of limit blocks (22) are provided on the bottom of the sand blasting plate (5), a group of core box locking pins (23) are provided on the upper mold plate (1), and a pair of air blowing plate positioning pins (24) are provided on the air blowing plate (8).

3. A cold box sand core mold according to claim 1, characterized in that The upper push rod (10) is a hollow rod with openings at both ends, and an air hole communicating with the hollow rod is formed on the upper top plate (7). The diameter of the upper push rod (10) is smaller than the diameter of the sand shooting port.

4. A cold box sand core mold according to claim 1, characterized in that A group of positioning pins (25) are provided on the sandblasting plate (5), and a group of positioning seats (26) used in conjunction with the positioning pins (25) are provided on the upper top plate (7).

5. The cold box sand core mold forming inspection method according to claim 1, characterized in that the forming Here are the steps: ① Mold closing: a set of drawer block driving cylinders (4) push the corresponding drawer blocks (3) to the mold closing position, and the lower mold plate (2) rises to close the mold with the upper mold plate (1); ② Sand shooting, the upper top plate (7) and the blowing plate (8) are moved out synchronously. By default, the upper top plate (7) and the blowing plate (8) are tightened by the spring pull rod (14). The upper mold plate (1) and the lower mold plate (2) are synchronously raised to the sand shooting plate (5) for sand shooting. The nozzle (11) shoots the core sand from the sand shooting port into the sand core cavity. The sand shooting pressure is 4 bar and the sand shooting time is 3 seconds. ③ Curing. After the sandblasting is completed, the upper template (1) and the lower template (2) are synchronously lowered, the upper ejector plate (7) and the air blowing plate (8) are moved in together, and the upper template (1) and the lower template (2) are synchronously raised again to fit with the air blowing plate (8). A set of guide rods of the upper ejector plate (7) are inserted into the positioning guide sleeve of the upper template (1). When the air blowing plate (8) fits with the upper template (1), the limiting ejector rod (31) pushes against a set of guide rods of the upper ejector plate (7) to lift the upper ejector plate (7) upward for a distance, so that the spring of the spring pull rod (14) is in a compressed state, and the triethylamine gas enters the sand core cavity from the air blowing channel (15) through the curing gas inlet of the upper ejector rod (10) to cure the sand core. The air blowing time is 70 s. ④ Exhaust: After curing is completed, open the exhaust valve (30) to exhaust air in the sand core cavity. The exhaust time is 3 seconds; ⑤ Demolding, after exhausting, the lower mold plate (2) descends, the limiting ejector rod (31) is separated from the guide rod of the upper ejector plate (7), and under the spring reaction force of the spring pull rod (14), the upper ejector plate (7) follows the lower mold plate (2) and synchronously descends a certain distance, the upper ejector plate (7) pushes the upper ejector rod (10) to eject the formed sand core onto the lower mold plate (2), and then a group of extraction blocks drive the cylinder (4) to pull a group of extraction blocks (3) out of the mold, and the ejector column (17) drives the lower ejector plate (9) to rise, and the sand core in the lower mold plate (2) is ejected through the lower ejector rod (16), and the core is manually taken; ⑥Quality inspection, a. Establish a three-dimensional model of the sand core mold in the image processing system; b. Use a laser scanner to scan the six-sided contours of the molded sand core, and input the scanned images into the image processing system to fit the sand core cavity of the three-dimensional model. The image processing system uses color scales to indicate the degree of fitting. The color scales are red, yellow, green and blue from top to bottom. The top red value is 1.0, the bottom blue value is -1.0, and the middle green value is 0.5 to -0.5; c. Perform color sampling on the images corresponding to the six surfaces of the sand core in turn. There are multiple sampling points, and each sampling point corresponds to a surface of the sand core. Observe the sampling values. If the values ​​of each sampling point are displayed in green within the range of 0.5 to -0.5, it means that the fit is qualified.

Images