Green sand device for bench vice channel steel and molding method thereof

Abstract

The present invention relates to a wet sand device for a bench vise channel steel and a molding method thereof. The wet sand device comprises a workbench, a movable block and a channel steel. The workbench is provided with a positioning pin. The bottoms of the channel steel and the movable block are respectively provided with corresponding positioning holes 1 and 2. The positioning pin is sequentially inserted into the positioning holes 1 and 2 from bottom to top. The channel steel is provided with a U-shaped groove for accommodating the movable block. A sand tire made of wet sand is provided in the U-shaped groove. A protrusion is provided at the contact point between the movable block and the sand tire. The sand tire is made of wet sand, so that the channel steel and the sand tire become a whole, and a gapless fit is achieved, which solves the iron seepage problem caused by molten iron leakage during the casting of the bench vise channel steel and improves the product quality. The process of separately making and curing the resin sand core is reduced, and the processing cost is reduced. At the same time, since wet sand is used to replace the original resin sand core, triethylamine curing is not required, environmental pollution is avoided, and the working environment of the workers is improved.

Description

Technical Field

[0001] The invention relates to the technical field of casting, and in particular to a green sand device for bench vice channel steel and a molding method thereof. Background Art

[0002] The existing casting process of channel steel bench vise is as follows: 1. Use a sand core mold to make a resin sand core, and inject triethylamine into the resin sand core to solidify it; 2. After solidification for a period of time, take it out, trim the sand core, and store it for casting; 3. When using it, place the sand core in the groove of the channel steel, pour molten iron, keep it warm for a period of time, and then cool it. After cooling, take out the casting for sand cleaning. Since the resin sand core and the channel steel groove have dimensional tolerances, when the resin sand core is placed in the channel steel groove, a gap will inevitably appear between the sand core and the channel steel, causing iron infiltration defects during the casting of the channel steel bench vise, affecting product quality, and even affecting product use in severe cases. At the same time, the existing casting process has the problems of large waste, serious pollution, many processes, and low production efficiency. Summary of the invention

[0003] Aiming at the problem of iron infiltration defects caused by sand core casting in the prior art, the present invention provides a green sand device for bench vice channel steel and a molding method thereof.

[0004] The technical solution of the present invention for solving the above-mentioned technical problems is as follows: a wet sand device for a bench vise channel steel comprises a workbench, a movable block and a channel steel, the workbench is provided with a positioning pin, the bottom of the channel steel and the movable block are respectively provided with corresponding positioning hole one and positioning hole two, the positioning pin is sequentially inserted into the positioning hole one and positioning hole two from bottom to top, the channel steel is provided with a U-shaped groove for accommodating the movable block, a sand mold made of wet sand is provided in the U-shaped groove, and a protrusion is provided at the contact between the movable block and the sand mold.

[0005] The beneficial effects of the present invention are as follows: the resin sand core used in the prior art is pre-made and ready for use. Since there are errors in the production of the sand core and the U-shaped groove of the channel steel, the sand core and the U-shaped groove have interference fit or clearance fit, which makes installation difficult or leaves a gap, so that the problem of being unable to assemble or iron infiltration will occur during the casting process. The green sand is directly extruded on the channel steel to form a sand tire, which solves the problem of being unable to assemble or iron infiltration between the sand core and the U-shaped groove, so that the sand tire and the U-shaped groove of the channel steel can achieve seamless contact, avoid iron infiltration defects, and improve product quality. At the same time, since the green sand is used to replace the original resin sand core, triethylamine curing is not required, environmental pollution is avoided, and the working environment of workers is improved.

[0006] On the basis of the above technical solution, in order to achieve the convenience of use and the stability of the equipment, the present invention can also make the following improvements to the above technical solution:

[0007] Furthermore, the height of the upper end of the sand tire is greater than the height of the side wall of the U-shaped groove.

[0008] The beneficial effect of adopting the above further technical solution is that it matches the draft angle of the casting sand mold and improves the anti-iron seepage performance.

[0009] Furthermore, it also includes a scraping plate for scraping sand from the tire, the scraping plate is provided with a groove, and two sides of the groove are provided with empty knife grooves.

[0010] The beneficial effect of adopting the above-mentioned further technical solution is that it can not only scrape off the loose sand on the sand tire, but also form bulges on the sand tire, thereby improving the anti-iron seepage performance, and the operation is convenient and efficient; at the same time, the empty knife groove ensures that the groove surface on the scraping plate is on the U-shaped mouth plane of the U-shaped groove.

[0011] Furthermore, the groove is a triangular groove.

[0012] The beneficial effect of adopting the above further technical solution is that a triangular groove with a suitable angle is selected according to the draft angle of the casting sand mold, so as to form a protrusion of a corresponding shape on the sand mold, thereby improving the application range of the device.

[0013] Furthermore, the protrusion is a conical protrusion.

[0014] The beneficial effect of adopting the above further technical solution is that it is convenient to separate the loose block from the sand tire.

[0015] Furthermore, the length of the conical protrusion is 10 mm-30 mm, and the taper range is 10°-15°.

[0016] The beneficial effect of adopting the above further technical solution is that it is convenient to separate the loose block from the sand tire and improve the use range of the loose block.

[0017] Furthermore, a handle is provided on the movable block, and the handle and the protrusion are located on two sides of the movable block.

[0018] The beneficial effect of adopting the above further technical solution is that the movable block can be taken and placed by the handle, which is convenient for operation.

[0019] The present invention also relates to a green sand molding method, which uses the green sand molding device and comprises the following steps:

[0020] Take molding sand and water and mix them evenly to form wet molding sand;

[0021] Insert the channel steel and the movable block onto the positioning pins of the workbench in sequence;

[0022] Putting green sand in the U-shaped groove of the channel steel, using an extrusion plate to extrude the green sand toward the movable block along the length direction of the U-shaped groove, and continuously adding green sand during the extrusion process;

[0023] When the green sand is filled in the U-shaped groove to a certain length, a squeezing plate is used to compact the green sand from above the U-shaped groove to form a sand mold;

[0024] The scraping plate is clamped on the outer side wall of the upper end of the U-shaped groove, so that the scraping plate moves along the length direction of the U-shaped groove;

[0025] The channel steel and the movable block are removed from the positioning pin, and the movable block is removed from the U-shaped groove, so that a tapered hole is formed at the contact point between the movable block and the sand tire;

[0026] A drill rod is used to extend into the sand tire from the tapered hole and penetrate the sand tire to form a vent hole.

[0027] Furthermore, the humidity of the green sand is 2.9%-3.2%, and the compaction rate is 35%-40%.

[0028] The beneficial effects of the method are as follows: the existing resin sand core is changed into a sand tire formed by squeezing green sand, so that the sand tire is in seamless contact with the channel steel, iron infiltration defects are avoided, and product quality is improved. Due to the adoption of a new process method, the prefabricated sand core does not need to be stored separately, the storage and transportation process is reduced, storage space is saved, and storage costs are reduced. Since green sand is directly squeezed into a sand tire on the channel steel, the process of making the resin sand core separately is reduced, the processing cost is reduced, the process is simplified, and production efficiency is improved. At the same time, triethylamine has the disadvantages of strong irritation, amine odor, toxicity, flammability and explosion when exposed to open flames or high temperatures. Green sand is directly squeezed into a sand tire on the channel steel to replace the resin sand core, avoiding the use of triethylamine as a curing agent, improving the working environment of workers, avoiding the harm and safety hazards of triethylamine to workers, and reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0030] Figure 2 It is a schematic diagram of channel steel and sand tire;

[0031] Figure 3 is a schematic diagram of a live block;

[0032] Figure 4 It is a structural schematic diagram of Example 2;

[0033] Figure 5 Schematic diagram of the scraper plate in Example 2.

[0034] The accompanying drawings are marked as follows: 1. workbench; 2. positioning pin; 3. handle; 4. movable block; 5. channel steel; 6. sand tire; 7. positioning hole one; 8. conical protrusion; 9. positioning hole two; 10. scraper plate; 10-1. groove; 10-2. empty knife groove. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] Example 1

[0037] Please refer to Figures 1 to 3 , a wet sand molding device for a bench vise channel steel, comprising a workbench 1, a loose block 4 and a channel steel 5. A support frame is provided at the lower end of the workbench 1, and a positioning pin 2 is provided at the end of the workbench 1 to ensure the supporting effect on the channel steel 5, so as to facilitate the removal and placement of the loose block 4. The bottoms of the channel steel 5 and the loose block 4 are respectively provided with corresponding positioning holes 1 7 and positioning holes 2 9. The channel steel 5 and the loose block 4 are placed on the workbench 1, and the positioning pin 2 is inserted into the positioning holes 1 7 and positioning holes 2 9 in sequence from bottom to top. A U-shaped groove is provided on the channel steel 5 for accommodating the loose block 4, and a sand tire 6 made of wet sand is provided in the U-shaped groove. A protrusion is provided at the contact between the loose block 4 and the sand tire 6, and the protrusion is a conical protrusion 8. The conical protrusion 8 forms a conical hole in the sand tire 6, and a drill rod penetrates the sand tire 6 along the depth direction of the conical hole to form a vent. The length of the conical protrusion 8 is 10 mm-30 mm, and the taper range is 10°-15°. Conical protrusions of different lengths and tapers can be processed according to use requirements to better meet casting needs.

[0038] The height of the upper end of the sand mold 6 is greater than the height of the side wall of the U-shaped groove. The height of the upper end of the sand mold 6 is slightly higher than the height of the side wall of the U-shaped groove, so that it can maintain the molding state and coincide with the draft angle of the casting sand mold to avoid iron infiltration defects.

[0039] The movable block 4 is provided with a handle 3, and the handle 3 and the protrusion are located on both sides of the movable block 4. The handle 3 is a bolt, and a threaded hole matching the bolt is provided on the movable block 4. In order to increase the stability of the handle 3, a locking nut is provided at the connection between the handle 3 and the movable block 4.

[0040] The bottoms of the channel steel 5 and the movable block 4 are provided with mutually matching rounded corners. In order to avoid cracks in the channel steel 5 at the bending part, a rounded corner is provided at the bending part of the channel steel 5. In order to make the movable block 4 fully contact with the channel steel 5 and avoid the generation of gaps, a corresponding rounded corner is provided at the bottom of the movable block 4.

[0041] Example 2

[0042] Please refer to Figures 4 to 5 , which is different from Example 1 in that it also includes a scraping plate 10 for scraping the tire 6, and the rest is the same as Example 1.

[0043] A green sand device for a bench vise channel steel also includes a scraper plate 10, wherein the scraper plate 10 is provided with a groove 10-1, and both sides of the groove 10-1 are provided with empty knife grooves 10-2, and the empty knife grooves 10-2 are inserted into the outer side wall of the U-shaped groove. After the green sand is extruded and formed, the scraper plate 10 is clamped on the outer side of the U-shaped groove, and the scraper plate 10 is manually pushed to move along the length direction of the channel steel 5, so as to scrape off the excess loose sand on the sand mold 6, and at the same time, the structure of the groove 10-1 on the scraper plate 10 ensures that the height of the upper end of the sand mold 6 is slightly higher than the height of the side wall of the U-shaped groove.

[0044] In this embodiment, the groove 10 - 1 is a triangular groove, and the angle of the triangular groove is consistent with the draft angle of the casting sand mold, thereby effectively avoiding iron infiltration defects.

[0045] Example 3

[0046] The present invention also discloses a green sand molding method, which uses the green sand molding device as described above and comprises the following steps:

[0047] Take the molding sand and water and mix them evenly to form wet molding sand, the humidity of the wet molding sand is 2.9%-3.2%, and the compaction rate is 35%-40%. When the humidity is lower than 2.9%, the molding sand is not fully wetted, it is difficult to demold, the sand mold is fragile, and the casting is prone to sand holes and erosion defects; when the humidity is higher than 3.2%, the casting is prone to pinholes, pores, sand adhesion and other defects. The humidity is preferably 3%, and the compaction rate is preferably 38%.

[0048] The channel steel 5 and the loose block 4 are sequentially inserted into the positioning pin 2 of the workbench 1, that is, the positioning hole 1 7 and the positioning hole 2 9 are sleeved on the positioning pin 2, and the loose block 4 is placed in the U-shaped groove of the channel steel 5. In order to ensure the stability of the channel steel 5 and the loose block 4, the channel steel 5 is placed on the workbench 1;

[0049] Put the green sand in the U-shaped groove of the channel steel 5, and use the extrusion plate to extrude the green sand toward the movable block 4 along the length direction of the U-shaped groove. Add green sand continuously during the extrusion process. In order to avoid the green sand from falling during the compaction process and ensure the compaction effect of the green sand, during the extrusion and addition of green sand, a person's hand can be placed above the U-shaped groove to assist in sand pressing. The width of the extrusion plate is adapted to the U-shaped groove, and the material of the extrusion plate is preferably wood or nylon, which can achieve the extrusion effect and avoid collision between metals to cause accidental injury to the hand.

[0050] When the green sand is filled to a certain length in the U-shaped groove, an extrusion plate is used to compact the green sand from above the U-shaped groove to form a sand mold 6. The length of the green sand filling is controlled according to the use requirements. In order to improve the efficiency and effect of compaction, an extrusion plate can be used to knock the green sand from above the U-shaped groove;

[0051] The scraper plate 10 is clamped on the outer side wall of the upper end of the channel steel 5, and the scraper plate 10 is moved along the length direction of the channel steel 5. When the scraper plate 10 moves, the excess wet sand above the U-shaped groove is removed, and a protrusion corresponding to the groove 10-1 of the scraper plate 10 is formed above the sand mold 6, thereby effectively avoiding iron infiltration defects and ensuring casting quality;

[0052] Remove the channel steel 5 and the movable block 4 from the positioning pin 2, and remove the movable block 4 from the U-shaped groove, so that a tapered hole is formed at the contact between the movable block 4 and the sand mold 6;

[0053] Use a drill rod to extend into the sand mold 6 from the tapered hole and penetrate the sand mold 6 to form a vent hole. When the channel steel 5 is removed, the end is placed on the positioning pin 2, so that the end with the tapered hole is tilted at a certain angle, thereby facilitating the drill rod to drill through the hole, forming a vent hole, and completing the molding of the green sand.

[0054] In an optional embodiment, the channel steel 5 and the movable block 4 are first installed on the positioning pin 2, and then molding sand and water are taken and mixed evenly to form green molding sand.

[0055] In another optional embodiment, the movable block 4 is first placed in the U-shaped groove of the channel steel 5 so that the positioning hole 1 7 corresponds to the positioning hole 2 9 , and then the positioning hole 1 7 and the positioning hole 2 9 are sleeved on the positioning pin 2 .

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A green sand molding method for a bench vise channel steel, characterized in that: A green sand molding device is used, which includes a workbench, a movable block and a channel steel. A positioning pin is provided on the workbench. The bottoms of the channel steel and the movable block are respectively provided with corresponding positioning holes 1 and 2. The positioning pin is inserted into the positioning holes 1 and 2 in sequence from bottom to top. The channel steel is provided with a U-shaped groove for accommodating the movable block. A sand mold made of green sand is provided in the U-shaped groove. A protrusion is provided at the contact between the movable block and the sand mold. The green sand molding method comprises the following steps: The molding sand and water are mixed evenly to form wet molding sand, wherein the wet molding sand has a humidity of 2.9%-3.2% and a compaction rate of 35%-40%; Insert the channel steel and the movable block onto the positioning pins of the workbench in sequence; Putting green sand in the U-shaped groove of the channel steel, using an extrusion plate to extrude the green sand toward the movable block along the length direction of the U-shaped groove, and continuously adding green sand during the extrusion process; When the green sand is filled in the U-shaped groove to a certain length, a squeezing plate is used to compact the green sand from above the U-shaped groove to form a sand mold; The scraping plate is clamped on the outer side wall of the upper end of the U-shaped groove, so that the scraping plate moves along the length direction of the U-shaped groove; The channel steel and the movable block are removed from the positioning pin, and the movable block is removed from the U-shaped groove, so that a tapered hole is formed at the junction of the sand tire and the movable block; A drill rod is used to extend into the sand tire from the tapered hole and penetrate the sand tire to form a vent hole.

2. The green sand molding method for bench vise channel steel according to claim 1, characterized in that: The height of the upper end portion of the sand tire is greater than the height of the side wall of the U-shaped groove.

3. The green sand molding method for bench vise channel steel according to claim 2, characterized in that: It also includes a scraping plate for scraping sand from the tire, wherein the scraping plate is provided with a groove, and two sides of the groove are provided with empty knife grooves.

4. The green sand molding method for bench vise channel steel according to claim 3, characterized in that: The groove is a triangular groove.

5. The green sand molding method for bench vise channel steel according to claim 1 or 2, characterized in that: The protrusion is a conical protrusion.

6. The green sand molding method for bench vise channel steel according to claim 5, characterized in that: The length of the conical protrusion is 10mm-30mm, and the taper range is 10°-15°.

7. The green sand molding method for bench vise channel steel according to claim 1 or 2, characterized in that: A handle is provided on the movable block, and the handle and the protrusion are located on two sides of the movable block.

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