CN107433326B - Ground stake is punched and is used ground auger - Google Patents
Ground stake is punched and is used ground auger Download PDFInfo
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- CN107433326B CN107433326B CN201710589479.0A CN201710589479A CN107433326B CN 107433326 B CN107433326 B CN 107433326B CN 201710589479 A CN201710589479 A CN 201710589479A CN 107433326 B CN107433326 B CN 107433326B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/22—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
Abstract
A ground auger for punching ground piles belongs to the field of metal investment casting. The invention provides a ground auger for punching a ground pile, which is formed by investment casting of water glass, mold making by metal, preparation of an ultrathin shell and casting in a magnetic field. The ultrathin shell sequentially comprises a thin wax layer, a resin coating and a reinforcing layer from inside to outside. Wherein the surface coating comprises 30-50 parts by weight of quartz powder, 10-15 parts by weight of silicone-acrylate resin, 5-10 parts by weight of water glass and 50-60 parts by weight of alcohol; the reinforcing layer comprises 30-40 parts by weight of quartz powder, 10-15 parts by weight of TiC, 10-20 parts by weight of lignin, 5-10 parts by weight of bauxite and 50-60 parts by weight of water. The invention solves the problems of loose alloy structure, large crystal grains, easy generation of shrinkage cavity and shrinkage porosity in the alloy, reduction of impact toughness and the like after casting, thereby improving the hardness, wear resistance, shock resistance and impact resistance of the alloy.
Description
Technical Field
The invention relates to a ground auger, in particular to a ground auger for punching ground piles, and belongs to the field of metal investment casting.
Background
The earth drill is a tool which is arranged in front of a drill rod and gyrates to break rock pavement. In our country, the increase of urban construction and greening engineering, so the demand of ground auger, an auxiliary tool for reducing labor intensity, is increasing continuously. The prior art generally uses a casting process to manufacture the ground auger, although the process can produce a part blank with a complex shape and wide adaptability, the cast alloy has the defects of loose structure, large crystal grains, easy generation of shrinkage cavity, shrinkage porosity and the like in the interior, particularly the impact toughness is reduced, and the requirements of the high-strength alloy tool of the ground auger on hardness, wear resistance, shock resistance and impact resistance cannot be met. Chinese patent (publication No. 103464683A) discloses an investment casting method, aiming at the thick and big part of casting which is easy to have shrinkage and loose defects during casting, after 5-10 layers of wax mould coating are made into shell, a heat conducting part is placed outside the coating layer of the thick and big part. However, 5-10 layers are required for manufacturing the shell by the coating, the material cost is extremely high, and the sequential solidification is realized by the heat-conducting component, so that the production efficiency is reduced.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a ground drill for punching a ground pile, which has high hardness, high wear resistance and high toughness.
The above object of the present invention is achieved by the following technical solutions: the utility model provides a ground stake is punched and is used ground auger, ground stake punch and use ground auger form by water glass investment casting, wherein ultra-thin shell in the water glass investment casting includes thin wax layer, resin coating, back up coat from inside to outside in proper order.
The invention is different from the water glass mould melting method in the prior art that the wax mould is firstly manufactured and then the shell is manufactured, the shell is directly manufactured, and the mould shell is extremely thin. The ultrathin shuttering consists of a thin wax layer, a single-layer resin coating and a single-layer reinforcing layer, wherein the thin wax layer can be fused on the surface of the resin coating after being heated, so that the separation effect is kept, and the wax loss step can be omitted. The resin coating has good toughness, can bear the internal and external forces during pouring, and the reinforcing layer has high hardness, difficult deformation and high heat resistance, so that the ultrathin shell can meet all requirements in water glass investment casting. The ultrathin shell can solve the problems that the shell manufactured by a common water glass die-melting method is thick and consists of 5-10 layers of high-temperature-resistant coatings, materials are wasted, the surface smoothness of the manufactured shell is poor due to incomplete heating of the shell during roasting, the shell is too thick during pouring, the gas generation amount is increased, the heat dissipation performance is poor, and finally the alloy after casting has loose structure, large grains and easy shrinkage cavity, shrinkage porosity, impact toughness reduction and the like, so that the hardness, wear resistance, shock resistance and impact resistance of the alloy are improved.
The preparation method of the ultrathin shell comprises the following steps: firstly, manufacturing a group of detachable spiral-structure metal molds by using aluminum alloy, spraying a layer of thin wax inside the metal molds, then dip-coating a layer of resin coating, spreading sand, then putting the metal molds into an oven for heating, keeping the temperature at 250 ℃ for 15-20min at 200-. The invention directly adopts the aluminum alloy with good modeling to manufacture the die set, can be disassembled and combined to meet the requirement of a ground auger spiral structure, has simpler disassembling and die making process and has complex recombination structure. The metal mold has high hardness and stable model, can be separated from the mold shell after the mold shell is formed, has thinner mold shell, can be repeatedly used, saves cost and improves production efficiency.
The surface coating comprises 30-50 parts by weight of quartz powder, 10-15 parts by weight of silicone-acrylic resin, 5-10 parts by weight of water glass and 50-60 parts by weight of alcohol. The quartz powder in the resin coating is a high-fire-resistant material, the silicone-acrylic resin is a high-toughness binding agent, the surface smoothness of the coating can be improved, and the water glass can make the coating hard, and the alcohol is a solvent.
The reinforcing layer comprises 30-40 parts by weight of quartz powder, 10-15 parts by weight of TiC, 10-20 parts by weight of lignin, 5-10 parts by weight of bauxite and 50-60 parts by weight of water. The quartz powder of the strengthening layer is a high-fire-resistant material, the TiC is high in hardness and can prevent high-temperature oxidation of the material, the lignin has extremely high viscosity and can be combined with the coating, the bauxite plays a role in strengthening the coating, and water is used as a solvent.
The sand is quartz sand with the granularity of 50-100 meshes. The quartz sand with a certain granularity is added between the resin coating and the reinforcing layer, so that the hardness of the shell layer can be increased. Too small a particle size increases the hardness less significantly, and too large a particle size affects the ultra-thin shell thickness.
A preparation method of a ground auger for punching a ground pile comprises the following steps:
s1, stirring and melting the ground drilling material for punching the ground pile at 1300-1400 ℃ to obtain a molten metal mixed material;
s2, placing the ultrathin shell into an iron box container, filling iron pills and quartz sand for fixation, and applying a magnetic field around;
s3, pouring the molten and mixed metal into the ultrathin shell in the step S2 while the molten and mixed metal is hot, and cooling to obtain a ground auger blank;
s4, quenching and tempering the blank;
and S5, immersing the blank into a galvanizing solution for galvanizing, and obtaining the ground auger for punching the ground pile.
During pouring, iron shots are filled outside to serve as back sand, so that a magnetic field is conveniently applied.
According to the invention, iron shots are filled in the water glass melting mold, so that a stable magnetic field can be formed during pouring. Therefore, under the action of magnetic field force, the flow of the molten mixed material of the metal in the ground drill is accelerated, and the ground drill has certain directionality, so that the cooling speed can be accelerated, the growth of metal grains can be inhibited, the problems of shrinkage cavity, looseness and the like of the formed cast iron can be effectively avoided, the metal structure is tighter, and the obtained ground drill has higher toughness, strength and wear resistance.
The ground drill material for punching the ground pile comprises the following components in percentage by weight: c: 0.2-0.3%, Si: 1.30-1.50%, Mn: 0.80-1.00%, Cr: 1.30-1.50%, Ni: 0.05 to 0.10%, Mo: 0.05-0.10%, Al: 0.04-0.08%, P is less than or equal to 0.040%, S is less than or equal to 0.040%, and the balance is iron. The material is iron-based alloy, elements such as C, Si, Mn, Cr, Ni, Mo, Al, P, S and the like are doped, and the strength and toughness of the material can be enhanced after the multi-element modified metal is added, so that the effect of hard alloy is achieved, and the production cost is reduced.
The quenching treatment is oil cooling after heat preservation is carried out for 1-2h at 850-950 ℃.
The tempering treatment is to cool at room temperature after heat preservation at 150-250 ℃ for 4-5 h.
After the metal alloy is subjected to heat treatment, the strength and the hardness can be improved, austenite in an alloy phase can be converted into martensite or transformed into martensite through quenching, the strength and the hardness of the alloy are increased, the toughness of the alloy material is recovered through the quenching treatment, and the fatigue resistance of the material is enhanced. The oil cooling after quenching is that the cooling speed is too high, the internal stress is large, the surface of the alloy can be deformed or cracked, and the oil cooling changes a contact medium, so that the cooling speed is reduced.
The nano diamond powder accounting for 0.5-2% of the weight percentage is added into the galvanizing solution. The zinc coating has good corrosion resistance and water resistance, and the nano diamond powder is added to increase the hardness and the cutting capability of the coating and improve the surface smoothness of the coating, so that the wear resistance of the earth auger is improved.
Compared with the prior art, the invention has the following advantages:
1. in the investment casting process, the wax mold is not manufactured, the aluminum alloy mold is used for manufacturing the mold, the shell can be separated from the metal mold after the shell is manufactured, the metal mold can be recycled, and the production efficiency is improved.
2. The shell manufactured by the invention is an ultrathin shuttering which consists of a surface coating and a reinforcing layer, thereby greatly saving materials and reducing the production cost compared with a shuttering which needs 5-10 layers of high-fire-resistant coatings, wherein, the surface coating is added with silicone-acrylic resin, which can greatly improve the surface smoothness of the materials, thereby improving the wear resistance of the cast product.
3. Iron shots are filled outside the ultrathin shuttering, a stable magnetic field can be formed after the magnetic field is applied, and the formed ground auger has a compact metal structure without shrinkage and loosening phenomena under the action of the magnetic field during pouring, so that the hardness, toughness and wear resistance of the material are greatly improved. And the iron shot placed outside can also accelerate the forming and cooling speed after pouring.
4. The material is iron-based alloy, is doped with elements such as C, Si, Mn, Cr, Ni, Mo, Al, P, S and the like, has lower required melting temperature compared with hard alloy mainly containing WC, and reduces the production operation difficulty and cost.
Detailed Description
The following are specific examples of the present invention to further describe the technical solutions of the present invention, but the present invention is not limited to these examples.
TABLE 1 EXAMPLES 1-5 resin coating and reinforcing layer Material compositions and parts by weight thereof
Example 1
Stirring and melting the ground drill material for punching the ground pile at 1300 ℃ to obtain a molten metal mixed material; the ground drill for punching the ground pile comprises the following material components in percentage by weight: c: 0.2%, Si: 1.30%, Mn: 0.80%, Cr: 1.30%, Ni: 0.05%, Mo: 0.05%, Al: 0.04 percent, less than or equal to 0.040 percent of P, less than or equal to 0.040 percent of S and the balance of iron.
Adding the components of the resin coating and the reinforcing layer into a high-speed stirrer respectively according to the table 1 and the embodiment 1, and mixing and stirring the components for 20min at the rotating speed of 3000r/min to obtain resin coating dip-coating liquid and reinforcing layer dip-coating liquid for later use;
firstly, manufacturing a group of detachable spiral-structure metal molds by using aluminum alloy, spraying a layer of thin wax inside the metal molds, then dip-coating a layer of resin coating, spreading sand, putting the metal molds into an oven for heating, keeping the temperature at 200 ℃ for 15min, then dip-coating a reinforcing layer, drying, taking the shells out of the metal molds, and finally roasting the shells in a roasting furnace at 800 ℃ for 30min to obtain the ultrathin shells. The sand is commercially available quartz sand with the specification of 40 × 80 meshes, and is screened by a 50-mesh sieve and a 100-mesh sieve for later use.
Placing the ultrathin shell into an iron box container, filling iron pills and quartz sand for fixation, and applying a magnetic field around the ultrathin shell;
pouring the molten mixed metal into the ultrathin shell while the molten mixed metal is hot, and cooling to obtain a ground auger blank; quenching the blank at 850-; then tempering treatment is carried out, the temperature is kept at 250 ℃ for 4 to 5 hours at 150 ℃ and then the mixture is cooled at room temperature;
and immersing the blank into hot zinc liquid for galvanizing to obtain the ground auger for punching the ground pile. The nano diamond powder accounting for 0.5 percent of the weight percent is added into the galvanizing solution.
Example 2
Stirring and melting the ground drilling material for punching the ground pile at 1340 ℃ to obtain a molten metal mixed material; the ground drill for punching the ground pile comprises the following material components in percentage by weight: c: 0.22%, Si: 1.35%, Mn: 0.82%, Cr: 1.35%, Ni: 0.06%, Mo: 0.06%, Al: 0.05 percent, less than or equal to 0.040 percent of P, less than or equal to 0.040 percent of S and the balance of iron.
Respectively adding the components of the resin coating and the reinforcing layer into a high-speed stirrer according to the table 1, and mixing and stirring at the rotating speed of 3000r/min for 20min to obtain resin coating dip-coating liquid and reinforcing layer dip-coating liquid for later use;
firstly, manufacturing a group of detachable spiral-structured metal molds by using aluminum alloy, spraying a layer of thin wax inside the metal molds, then dip-coating a layer of resin coating, spreading sand, putting the metal molds into an oven for heating, keeping the temperature at 210 ℃ for 16min, then dip-coating a reinforcing layer, drying, taking the shells out of the metal molds, and finally roasting the shells in a roasting furnace at 850 ℃ for 40min to obtain the ultrathin shells. The sand is commercially available quartz sand with the specification of 40 × 80 meshes, and is screened by a 50-mesh sieve and a 100-mesh sieve for later use.
Placing the ultrathin shell into an iron box container, filling iron pills and quartz sand for fixation, and applying a magnetic field around the ultrathin shell;
pouring the molten mixed metal into the ultrathin shell while the molten mixed metal is hot, and cooling to obtain a ground auger blank;
quenching the blank at 870 ℃, preserving heat for 1.5h, and then carrying out oil cooling; then tempering, keeping the temperature at 170 ℃ for 4.5h, and cooling at room temperature;
and immersing the blank into hot zinc liquid for galvanizing to obtain the ground auger for punching the ground pile. Nano diamond powder accounting for 0.8 percent of the weight percent is added into the galvanizing solution.
Example 3
Stirring and melting the ground drill material for punching the ground pile at 1350 ℃ to obtain a molten metal mixed material; the ground drill for punching the ground pile comprises the following material components in percentage by weight: c: 0.25%, Si: 1.40%, Mn: 0.85%, Cr: 1.40%, Ni: 0.07%, Mo: 0.07%, Al: 0.06 percent, less than or equal to 0.040 percent of P, less than or equal to 0.040 percent of S and the balance of iron.
Respectively adding the components of the resin coating and the reinforcing layer into a high-speed stirrer according to the table 1, and mixing and stirring at the rotating speed of 3000r/min for 20min to obtain resin coating dip-coating liquid and reinforcing layer dip-coating liquid for later use;
firstly, manufacturing a group of detachable spiral-structure metal molds by using aluminum alloy, spraying a layer of thin wax inside the metal molds, then dip-coating a layer of resin coating, spreading sand, putting the metal molds into an oven for heating, keeping the temperature at 220 ℃ for 17min, then dip-coating a reinforcing layer, drying, taking the shells out of the metal molds, and finally placing the shells into a roasting furnace for roasting at 900 ℃ for 45min to obtain ultrathin shells. The sand is commercially available quartz sand with the specification of 40 × 80 meshes, and is screened by a 50-mesh sieve and a 100-mesh sieve for later use.
Placing the ultrathin shell into an iron box container, filling iron pills and quartz sand for fixation, and applying a magnetic field around the ultrathin shell;
pouring the molten mixed metal into the ultrathin shell while the molten mixed metal is hot, and cooling to obtain a ground auger blank;
quenching the blank at 900 ℃, preserving heat for 1.5h and then carrying out oil cooling; then tempering, keeping the temperature at 200 ℃ for 4.5h, and cooling at room temperature;
and immersing the blank into hot zinc liquid for galvanizing to obtain the ground auger for punching the ground pile. Nano diamond powder accounting for 1.2 percent of the weight is added into the galvanizing solution.
Example 4
Stirring and melting the ground drilling material for punching the ground pile at 1380 ℃ to obtain a molten metal mixed material; the ground drill for punching the ground pile comprises the following material components in percentage by weight: c: 0.27%, Si: 1.45%, Mn: 0.88%, Cr: 1.45%, Ni: 0.08%, Mo: 0.08%, Al: 0.07 percent, less than or equal to 0.040 percent of P, less than or equal to 0.040 percent of S and the balance of iron.
Respectively adding the components of the resin coating and the reinforcing layer into a high-speed stirrer according to the table 1, and mixing and stirring at the rotating speed of 3000r/min for 20min to obtain resin coating dip-coating liquid and reinforcing layer dip-coating liquid for later use;
firstly, manufacturing a group of detachable spiral-structure metal molds by using aluminum alloy, spraying a layer of thin wax inside the metal molds, then dip-coating a layer of resin coating, spreading sand, putting the metal molds into an oven for heating, keeping the temperature at 240 ℃ for 19min, then dip-coating a reinforcing layer, drying, taking the shells out of the metal molds, and finally placing the shells into a roasting furnace for roasting at 950 ℃ for 50min to obtain ultrathin shells. The sand is commercially available quartz sand with the specification of 40 × 80 meshes, and is screened by a 50-mesh sieve and a 100-mesh sieve for later use.
Placing the ultrathin shell into an iron box container, filling iron pills and quartz sand for fixation, and applying a magnetic field around the ultrathin shell;
pouring the molten mixed metal into the ultrathin shell while the molten mixed metal is hot, and cooling to obtain a ground auger blank;
quenching the blank at 920 ℃, preserving heat for 1.8h, and then carrying out oil cooling; then tempering, keeping the temperature at 220 ℃ for 4.8h, and cooling at room temperature;
and immersing the blank into hot zinc liquid for galvanizing to obtain the ground auger for punching the ground pile. Nano diamond powder accounting for 1.5 percent of the weight is added into the galvanizing solution.
Example 5
Stirring and melting the ground drilling material for punching the ground pile at 1400 ℃ to obtain a molten metal mixed material; the ground drill for punching the ground pile comprises the following material components in percentage by weight: c: 0.3%, Si: 1.50%, Mn: 1%, Cr: 1.50%, Ni: 0.1%, Mo: 0.1%, Al: 0.08 percent, less than or equal to 0.040 percent of P, less than or equal to 0.040 percent of S and the balance of iron.
Respectively adding the components of the resin coating and the reinforcing layer into a high-speed stirrer according to the table 1, and mixing and stirring at the rotating speed of 3000r/min for 20min to obtain resin coating dip-coating liquid and reinforcing layer dip-coating liquid for later use;
firstly, manufacturing a group of detachable spiral-structure metal molds by using aluminum alloy, spraying a layer of thin wax inside the metal molds, then dip-coating a layer of resin coating, spreading sand, putting the metal molds into an oven for heating, keeping the temperature at 250 ℃ for 20min, then dip-coating a reinforcing layer, drying, taking the shells out of the metal molds, and finally placing the shells in a roasting furnace for roasting at the temperature of 1000 ℃ for 60min to obtain the ultrathin shells. The sand is commercially available quartz sand with the specification of 40 × 80 meshes, and is screened by a 50-mesh sieve and a 100-mesh sieve for later use.
Placing the ultrathin shell into an iron box container, filling iron pills and quartz sand for fixation, and applying a magnetic field around the ultrathin shell;
pouring the molten mixed metal into the ultrathin shell while the molten mixed metal is hot, and cooling to obtain a ground auger blank;
quenching the blank at 950 ℃, preserving heat for 2 hours and then carrying out oil cooling; then tempering, keeping the temperature at 250 ℃ for 5 hours, and cooling at room temperature;
and immersing the blank into hot zinc liquid for galvanizing to obtain the ground auger for punching the ground pile. Nano diamond powder accounting for 2 percent of the weight is added into the galvanizing solution.
Comparative example 1
The difference from example 1 is that the shell is made by a general water glass melt molding method.
Comparative example 2
The difference from example 1 is that the molten metal mix is poured hot into an ultra-thin shell without applying a magnetic field around it.
Comparative example 3
The difference from example 1 is that no nanodiamond powder was added to the hot zinc bath.
Comparative example 4
Hard alloy WC is used as a main ground auger material, and the ground auger for punching the ground pile is obtained after casting forming, heat treatment and hot galvanizing by a common water glass mold melting method.
The ground pile obtained in examples 1 to 5 and comparative examples 1 to 4 was drilled and tested for performance, and the test results are shown in table 2.
TABLE 2 ground auger performance test data for boring ground piles in examples 1-5 and comparative examples 1-4
As can be seen from Table 1, in the ground auger water glass investment casting for ground pile drilling, the ultra-thin shell is manufactured and the ground auger is cast and molded under a magnetic field, so that the hardness, the wear resistance and the toughness of the ground auger are effectively improved. Compared with the prior art, the preparation process further controls the material cost, the aluminum alloy die can be recycled, and the production efficiency is improved.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (4)
1. The ground drill for punching the ground pile is characterized by being formed by water glass investment casting, wherein an ultrathin shell in the water glass investment casting sequentially comprises a reinforcing layer and a resin coating from inside to outside;
the preparation method of the ultrathin shell comprises the following steps: firstly, manufacturing a group of detachable spiral-structure metal molds by using aluminum alloy, spraying a layer of thin wax inside the metal molds, then dip-coating a layer of resin coating, spreading sand, then putting the metal molds into an oven for heating, keeping the temperature at 250 ℃ for 15-20min at 200-.
2. The pile boring auger of claim 1, wherein said resin coating comprises: 30-50 parts of quartz powder, 10-15 parts of silicone-acrylic resin, 5-10 parts of water glass and 50-60 parts of alcohol.
3. The ground auger for perforating a ground pile as recited in claim 1, wherein said reinforcing layer comprises: 30-40 parts of quartz powder, 10-15 parts of TiC, 10-20 parts of lignin, 5-10 parts of bauxite and 50-60 parts of water.
4. The ground auger for boring a ground pile according to claim 1, wherein the sand is quartz sand having a grain size of 50-100 mesh.
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| CN201710589479.0A CN107433326B (en) | 2017-07-19 | 2017-07-19 | Ground stake is punched and is used ground auger |
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| CN201710589479.0A CN107433326B (en) | 2017-07-19 | 2017-07-19 | Ground stake is punched and is used ground auger |
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| CN107433326A CN107433326A (en) | 2017-12-05 |
| CN107433326B true CN107433326B (en) | 2020-04-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103350182A (en) * | 2013-06-25 | 2013-10-16 | 天长市天翔集团有限公司 | Novel composite hardening agent for water-glass investment casting |
| CN103464683A (en) * | 2013-09-05 | 2013-12-25 | 贵州安吉航空精密铸造有限责任公司 | Investment casting method |
| CN203390152U (en) * | 2013-06-08 | 2014-01-15 | 温州锐特铸造有限公司 | Novel valve investment composite shell mold |
| CN103831397A (en) * | 2014-03-27 | 2014-06-04 | 浙江宇达化工有限公司 | Shell making method of water glass through investment casting |
| CN105414484A (en) * | 2015-11-24 | 2016-03-23 | 怀宁县群力汽车配件有限公司 | Fired mold precise casting technology for producing automobile H-shaped front shaft |
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| CN104148582A (en) * | 2014-08-20 | 2014-11-19 | 无锡柯马机械有限公司 | Evaporative-pattern magnetic mold casting method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203390152U (en) * | 2013-06-08 | 2014-01-15 | 温州锐特铸造有限公司 | Novel valve investment composite shell mold |
| CN103350182A (en) * | 2013-06-25 | 2013-10-16 | 天长市天翔集团有限公司 | Novel composite hardening agent for water-glass investment casting |
| CN103464683A (en) * | 2013-09-05 | 2013-12-25 | 贵州安吉航空精密铸造有限责任公司 | Investment casting method |
| CN103831397A (en) * | 2014-03-27 | 2014-06-04 | 浙江宇达化工有限公司 | Shell making method of water glass through investment casting |
| CN105414484A (en) * | 2015-11-24 | 2016-03-23 | 怀宁县群力汽车配件有限公司 | Fired mold precise casting technology for producing automobile H-shaped front shaft |
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Effective date of registration: 20211215 Address after: 315000 Qiu Cun Zhen Cao Cun, Fenghua District, Ningbo City, Zhejiang Province Patentee after: Ningbo Fenghua Huawei Precision Casting Co.,Ltd. Address before: 315100 No. 2086, ningheng South Road, Hengxi Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee before: NINGBO QIANHAO METAL PRODUCT Co.,Ltd. |