[0053] Example one
[0054] The quick connection filter flange of this embodiment, such as figure 1 with 2 As shown, including the first flange 3, the second flange 7, the circular filter screen 5, the fastening bolt 2 and the nut 8, the corresponding positions of the first flange 3, the second flange 7 and the circular filter screen 5 Four waist-shaped holes 9 are respectively opened, and the four waist-shaped holes 9 are arranged symmetrically in pairs. The fastening bolts 2 successively penetrate the first flange 3, the circular filter screen 5 and the second flange 7 to be threaded with the nut 8. A sealing gasket 6 is arranged between the first flange 3 and the second flange 7. There are two sealing gaskets 6 and the two sealing gaskets 6 are respectively arranged on both sides of the circular filter screen 5. The first flange 3 and the second flange The two opposite sides of the two flanges 7 are respectively installed with a pipe interface 1, and the first flange 3 and the second flange 7 are connected with a sealing rubber ring 4.
[0055] The mass percentages of the components in the first flange and the second flange are: C: 0.12%, Al: 2.13%, Zn: 0.46%, Si: 0.24%, Mn: 0.87%, S: ≤0.030%, P: ≤0.030%, Cr: 0.06%, Ni: 0.13%, Cu: 0.18%, V: 0.03%, Mo: 0.02%, Ti: 0.29%, B: 0.02%, Pd: 0.06%, Pt: 0.07%, W : 0.15%, Ta: 0.02%, Nd: 0.17%, Ce: 0.02%, Eu: 0.04%, Lu: 0.23%, Au: 0.25%, Ag: 0.43%, Ga: 0.01%, Y: 0.12%, Sn : 0.43%, Zr: 0.19%, Re: 0.06%, Os: 0.03%, Hf: 0.16%, Bi: 0.24%, glass fiber: 0.27%, calcium oxide: 0.46%, light calcium carbonate: 0.27%, talc Powder: 0.28%, magnesium oxide: 0.17%, the balance is Fe;
[0056] The casting process of the first flange and the second flange includes the following steps:
[0057] (1) Smelting raw materials:
[0058] a. Add the raw materials into the furnace according to the predetermined mass percentage of each component in the flange, increase the temperature in the furnace to 1420 degrees Celsius to 1490 degrees Celsius, and the raw materials are smelted to form an alloy solution;
[0059] b. Hot ladle, pour the alloy solution in the furnace into the ladle for hot ladle;
[0060] c. After the hot ladle is completed, pour the alloy solution in the ladle into the electric furnace, increase the temperature in the electric furnace to 1560 degrees Celsius to 1590 degrees Celsius, heat for 14 to 18 minutes, and pour the alloy solution in the electric furnace into the ladle. Turn the package to cool down;
[0061] d. After pouring the ladle, pour the alloy solution in the ladle into the electric furnace, and the temperature is reduced to 1450 to 1470 degrees Celsius. Add 1.4% to 1.5% of spheroidizing agent and 0.2% to 0.3% in the ladle pit. Inoculant, use 5-6kg thin steel plate, the thickness of the thin steel plate is 0.5mm to 1mm, cover the thin steel plate on the spheroidizing agent and inoculant, and tamping;
[0062] e. Pour the alloy solution in the electric furnace into the other side of the inner cavity of the ladle, and the spheroidization reaction is 70s to 75s. After the spheroidization reaction is complete, sprinkle a layer of slag-collecting agent to quickly slag off;
[0063] f. After slagging quickly, sprinkle expanded perlite powder on the surface of the alloy solution immediately, and slag twice. After slagging is completed, the alloy solution to be cast is formed, and the pouring is completed within five minutes;
[0064] (2) Wax mold preparation: use low-temperature wax and mechanical wax injection technology to make wax molds that are consistent with castings and contain heat-preserving risers, and the wax molds are trimmed, and then the wax molds are cleaned with wax blank cleaning agent;
[0065] (3) Making a shell mold sand mold on the wax mold made in step (2): This step includes the following steps:
[0066] A. At the position where the wax mold is placed on the thermal insulation riser, use EVA film to cover the surface where the thermal insulation riser is placed to prevent the surface from being contaminated;
[0067] B. Coating the first surface layer on the surface of the wax mold:
[0068] First, dipping the surface of the wax mold with zirconium powder and silica sol binder to prepare a slurry, the viscosity of the slurry is 45-50 seconds;
[0069] Then, use 150 mesh zirconium sand to artificially float the surface of the wax model that has been dipped in the slurry. After the sand is floated, the residual slurry and zirconium sand on the EVA film should be cleaned;
[0070] Third, the wax mold after artificial floating sand is naturally dried, and the drying time is 9-12 hours;
[0071] C. Coating a second transition layer on the surface of the wax mold prepared in step B:
[0072] First, the surface of the wax mold prepared in step B is dip-coated with a slurry of maleic powder and silica sol binder, and the viscosity of the slurry is 35 to 38 seconds;
[0073] Then, use 65-80 mesh maleic sand to artificially float the surface of the wax mold that has been dipped in the slurry. After the floating sand, clean the residual slurry and maleic sand on the EVA film;
[0074] Third, place the artificially sanded wax mold in a vacuum drying box for drying, control the temperature in the vacuum drying box to 45-55 degrees Celsius, control the air pressure in the vacuum drying box to 110-130 Pa, and the drying time to 15- 20 hours;
[0075] D. Coating a third reinforcement layer on the surface of the wax mold prepared in step C:
[0076] First, the surface of the wax mold prepared in step C is dip-coated with a slurry of maleic powder and silica sol binder, and the viscosity of the slurry is 17-19 seconds;
[0077] Then, use 6-9 mesh maleic sand to artificially float the surface of the wax mold that has been dipped in the slurry. After the floating sand, clean the residual slurry and maleic sand on the EVA film;
[0078] Third, place the wax mold in a vacuum drying box for drying, control the temperature in the vacuum drying box to 55-65 degrees Celsius, control the air pressure in the vacuum drying box to 65-95 Pa, and the drying time to be 12-15 hours;
[0079] E. Coating a fourth sealing layer on the surface of the wax mold prepared in step D:
[0080] First, the surface of the wax mold prepared in step D is dip-coated with a slurry of maleic powder and silica sol binder, and the viscosity of the slurry is 5-6 seconds;
[0081] Then, clean the residual slurry on the EVA film;
[0082] Third, place the artificially floating wax mold at a wind speed of 1.1 to 1.2 m/s for drying, and the drying time is 12 to 36 hours;
[0083] (Iv) Dewaxing: using steam dewaxing, the steam pressure is 0.6 MPa, the time is 18 to 55 minutes, and the EVA film on the insulation riser should be removed before dewaxing to make a shell mold;
[0084] ㈤Shell mold baking
[0085] The shell mold of step (iv) is roasted by stepwise heating and roasting. During roasting: first, the heating rate is controlled at 100°C/hour before 550°C, and secondly, the temperature is kept at 550°C for 1.5 hours, and then the temperature is raised to 1150°C at full speed. And keep it at 1150 degrees Celsius for half an hour, and finally cool it out;
[0086] (Vi) Use a wire cutting machine to cut the shell mold made in step (v) along the middle of each waist-shaped hole;
[0087] ㈦The shell mold cut in step (vi) is completely spliced and fixed with tape, placed in the sand box prepared according to the molding process, and the gate and insulation riser used for pouring on the shell mold are sealed with tape, and then placed in the passing The prepared mixed sand is filled with mixed sand and then compacted with a modeling compactor to form a sand mold;
[0088] (8) Scrape the surface of the sand mold and the sand box after the step (vii) is shaken, and pierce an air hole every 15cm on the surface of the sand mold, and the air hole shall be pierced to 3~5cm from the surface of the model;
[0089] ∨ Pouring
[0090] Before pouring, use a hot air blower with a constant temperature of 300 to 350 degrees Celsius to bake the shell mold for more than 1 hour. During pouring, the pouring temperature is 1500 to 1650 degrees Celsius. After pouring, the casting is kept in the sand for 1 to 2 hours;
[0091] (X) After pouring and molding, demoulding is carried out, each part of the shell mold is taken off in turn, and the insulation riser of the casting is cut off to obtain the casting.
[0092] The fast-connected filter flange of this embodiment has the following advantages: (1) Since the corresponding positions of the first flange, the second flange and the circular filter screen are respectively provided with at least one waist-shaped hole, only bolts are required for installation. The first flange, the second flange and the circular filter screen can be fixed by passing through the waist-shaped holes in turn. There is no need to slowly align the installation holes of the first flange, the second flange and the circular filter screen in sequence. , Which greatly improves installation efficiency, makes flange installation more efficient and fast, and can effectively speed up the progress of the project; (2) Since the circular filter screen is set between the first flange and the second flange, it can filter and block the pipeline As long as the round filter screen is cleaned regularly, the pipeline can be effectively prevented from being blocked, and the cleaning and installation are convenient and quick, and the usual maintenance cost is reduced; (3) Due to the arrangement between the first flange and the second flange There is at least one sealing gasket, which ensures the sealing performance of the flange and prevents leakage at the connecting part of the flange; (4) The first flange and the second flange cast by the composition mass percentage of the present invention are corrosion-resistant, The advantages of high temperature resistance, high strength and long service life; (5) When the raw materials of the present invention are smelted, through the combination of scalding, pouring, spheroidization, slagging and slagging, the raw materials are smelted more thoroughly and the raw materials can be effectively removed (6) Using low-temperature wax and mechanical wax injection technology to make wax molds, the resulting models are more accurate and detailed; (7) When making shell mold sand molds, use EVA film to cover and place heat preservation risers It can effectively prevent the surface from being contaminated. Compared with the traditional method of placing bladed iron sheets, EVA film is suitable for various specifications of risers, which is more convenient and efficient, and lower cost; (8) When making shell mold sand molds , Through the combination of vacuum drying oven drying and natural air drying, the shell molds are dried more thoroughly and efficiently, and the produced shell molds are of better quality and higher strength; (9) The shell molds are baked by stepwise heating , Improve the baking quality, reduce the probability of shell mold burst; (10) The present invention uses a wire cutting machine to cut the shell mold prepared in step (v) along the middle of each waist-shaped hole, so that after casting, it can be easily demolded , There is no need to break the shell mold, so that the shell mold can be used multiple times, greatly reducing the casting cost.
