CN103464680B - The integrated sand mould structure of helical-lobe compressor casing and manufacture using method thereof - Google Patents
The integrated sand mould structure of helical-lobe compressor casing and manufacture using method thereof Download PDFInfo
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- CN103464680B CN103464680B CN201310425994.7A CN201310425994A CN103464680B CN 103464680 B CN103464680 B CN 103464680B CN 201310425994 A CN201310425994 A CN 201310425994A CN 103464680 B CN103464680 B CN 103464680B
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Abstract
The present invention relates to the integrated sand mould structure of a kind of helical-lobe compressor casing, it comprises lower sand mold, upper sand mold, the second core and the first core, described upper sand mold offers the venthole in multiple UNICOMs die cavity and the sand mould structure external world and one for injecting the sprue of molten iron.Present invention also offers a kind of manufacture using method of above-mentioned sand mould structure, it comprises the following steps: moulding, coremaking, milling cup and core, mould assembling, cast, cleaning.The present invention make bearing block and chassis body one-body molded, make casing structure length short, required high-strength bolt quantity is few, cost-saving; Rely on castability proof strength and the sealing of foundry goods, more safe and reliable; Only need suction end to adopt alignment pin to ensure rotor assembly precision, discharge end bearings hole and rotor hole are that time processing ensures, precision is higher.
Description
Technical field
The present invention relates to a kind of casting field, particularly the integrated sand mould structure of a kind of helical-lobe compressor casing and manufacture using method thereof.
Background technology
At present, on domestic pneumatics screw rod market, the overwhelming majority have employed split type screw rod main unit structure, and main feature is that exhaust shaft bearing and casing adopt Split type structure.Split-type structural is adopted to have the shortcoming of following three aspects: 1, appearance and size aspect: offering due to exhaust flange mouth must in exhaust shaft bearing, and entire length size is large, causes waste of material; 2, structural strength aspect: pneumatics screw host exhaust side is final Compressed Gas, and pressure is maximum; With bolts on this position, as the poor sealing in face, easily produce leakage, and higher to the requirement of strength of connecting bolt; 3, processing and assembling aspect: split-type structural, suction end, exhaust end all need high-precision alignment pin to ensure the assembly precision of rotor, high relative to the requirement on machining accuracy of each product, and processing exists certain difficulty.Therefore the screw rod main unit structure making a kind of integral type has become the task of top priority.
Summary of the invention
The object of this invention is to provide the integrated sand mould structure of a kind of helical-lobe compressor casing.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: the integrated sand mould structure of a kind of helical-lobe compressor casing, described casing comprises bearing block and chassis body, described chassis body is column, its inside offers the large-scale cavity along its Axis Extension, be connected with described large-scale cavity and two small-sized cavitys of cylindricality paralleling with described large-scale cavity axis of axis, its sidewall is provided with two projections, two projections are distributed in the both sides of large-scale cavity and offer medium-sized cavity respectively, when large-scale cavity horizontal positioned, it is the first half of marginal casing that one of them medium-sized cavity is positioned at large-scale cavity axis, be called the first medium-sized cavity, it is connected by intercommunicating pore with described large-scale cavity and small-sized cavity, first medium-sized cavity, large-scale cavity and small-sized cavity form the first cavity, it is the Lower Half of marginal casing that another medium-sized cavity is positioned at large-scale cavity axis, be called the second medium-sized cavity, it has butterfly oral area, bearing block and the integrated sand mould structure of chassis body can be made to comprise lower sand mold upper surface at least being offered the die cavity that matches with the Lower Half lateral surface of described casing, offer the upper sand mold of the die cavity matched with the first half lateral surface of described casing, be arranged on the second core on lower sand mold and be arranged on, the first core between lower sand mold, the surface profile of the first core is identical with the profile of the first cavity, the surface profile of the second core is identical with the profile of the second medium-sized cavity, described upper sand mold offers the venthole in multiple UNICOMs die cavity and the sand mould structure external world and one for injecting the sprue of molten iron.
Optimize, described lower sand mold and upper sand mold have four die cavities respectively, the die cavity one_to_one corresponding on the die cavity on upper sand mold and lower sand mold and piece together four with sprue axle center for the center of circle complete die cavity that distributes of permutation ringwise.
Present invention also offers a kind of manufacture using method of above-mentioned sand mould structure, it comprises the following steps:
A, moulding: be fixed on banker by needing the mould of the casing produced, at mould surface spraying releasing agent, by described mold heated, on mould, assigned address places rising head, chill, is well placed cope, puts and add sand frame, sand hopper carries out putting sand, after putting sand, logical compressed air carries out pre-consolidation of blowing, and air is discharged by venting plug corresponding on mould; Following multipoint pressure contact passes through mechanical ramming, die sinking after 1-2S, and the unnecessary sand on sandbox surface is by doctor blade sandbox surface, and upper sand mold completes, and by moving case equipment, upper sand mold is moved to top box station; Lower sand mold is made by above-mentioned steps;
B, coremaking:
Make the first core, its order is as follows, core box is arranged on corresponding core shooter, die sinking cleaning box surface, spraying releasing agent, matched moulds penetrate sand 4 ~ 5s, heat, be blown into Triethylamine gas 20 ~ 40ml, solidification, wherein shooting pressure is 4 ~ 5bar, finally the core obtained is prescinded and penetrate Sha Kou, repair deflashing, core surface dip-coating alcohol radical graphite paint, obtains the first core after oven dry;
Make the second core, first choose particle comparatively thin comparatively rounding, epigranular, the high precoated sand of good permeability, the degree of packing, as the sand material of coremaking, is the intensity and the precision that ensure core, the hot box process of employing; Core box is arranged on core shooter, and wherein shooting pressure is 5 ~ 6.5bar, is heated to 250 ~ 270 DEG C, sintering time 200 ~ 250S, ensures that sinter layer thickness is greater than 6mm, after having sintered, core is taken out in die sinking, removes the burr burr on surface, must observe butterfly mouth place core color, as there is sepia, must do and scrap process, in order to avoid after the cast of follow-up molten iron, butterfly mouth place core is without enough surface strengths, cause distortion, cannot dimensional accuracy be ensured;
C, milling cup and core: top box station all mills out the cast gate of upper sand mold and core to come by milling cutter, blow away the floating sand on surface and broken sand;
D, mould assembling: the relevant position first and second core made being placed on lower sand mold, by repaking mechanism, foundry goods cope overturns 180 °, is incorporated on drag box, obtains complete sand mold;
E, cast: nodularization, inoculation are carried out to the molten iron of 1400 ~ 1450 ° in casting ladle, obtains qualified iron liquid; The slagging-off that deslagging agent carries out 0 ~ 1 minute must be put in casting ladle before cast; Iron liquid is poured into by the sprue position of sand mold, till cast gate is full; Foundry goods cools and to carry out after more than 75 minutes unpacking, clears up, takes out foundry goods in die cavity;
F, cleaning: the pouring and riser systems removing foundry goods, air outlet structure, carries out ball blast, grinding process, obtains described casing.
Beneficial effect of the present invention is: the present invention make bearing block and chassis body one-body molded, make casing structure length short, required high-strength bolt quantity, few cost-saving; Rely on castability proof strength and the sealing of foundry goods, more safe and reliable; Only need suction end to adopt alignment pin to ensure rotor assembly precision, discharge end bearings hole and rotor hole are that time processing ensures, precision is higher.
Accompanying drawing explanation
Accompanying drawing 1 is the front view of casing;
Accompanying drawing 2 is the right view of casing;
Accompanying drawing 3 is the sectional view A-A of accompanying drawing 2;
Accompanying drawing 4 is the front view of the second core;
Accompanying drawing 5 is the sectional view B-B of accompanying drawing 4;
Accompanying drawing 6 is the schematic diagram of sand mould structure;
In accompanying drawing: 1, casing; 11, large-scale cavity; 12, small-sized cavity; 21, upper sand mold; 22, lower sand mold; 23, the first core; 24, the second core; 25, venthole; 26, sprue; 131, the first medium-sized cavity; 132, the second medium-sized cavity.
Detailed description of the invention
Below in conjunction with embodiment shown in the drawings, the present invention is described in detail below:
As shown in Figure 1, 2, 3, the main body of casing 1 is column, its inside offers along the large-scale cavity 11 of its Axis Extension, to be connected with large-scale cavity 11 and the small-sized cavity 12 of two cylindricalitys that parallels with large-scale cavity 11 axis of axis, its sidewall is provided with two projections, two projections are distributed in the both sides of large-scale cavity and offer medium-sized cavity respectively, are respectively the first medium-sized cavity 131 and the second medium-sized cavity 132.With the axis of large-scale cavity 11 for line of demarcation, when large-scale cavity 11 horizontal positioned, the first half of the casing 1 that the first medium-sized cavity 131 is positioned at, it is connected by intercommunicating pore with between large-scale cavity 11 and small-sized cavity 12, first medium-sized cavity 131, large-scale cavity 11 and small-sized cavity 12 form the first cavity, and it is the Lower Half of marginal casing 1 that the second medium-sized cavity 132 is positioned at large-scale cavity 11 axis.
As shown in Figure 6, sand mould structure comprise the die cavity that the Lower Half lateral surface of upper surface at least offering one and casing matches lower sand mold 22, offer and the upper sand mold 21 of die cavity that the first half lateral surface of casing 1 matches, the first core 23 of being arranged on the second core 24 on lower sand mold 22 and being arranged between sand mold 21 and lower sand mold 22.Upper sand mold 21 offers the venthole 25 in multiple UNICOMs die cavity and the sand mould structure external world and one for injecting the sprue 26 of molten iron.First core 23 is corresponding with the first cavity, and both it, profile is identical; Second core 24 is corresponding with the second medium-sized cavity 132, and both profiles are identical.
In the present embodiment, lower sand mold 22 and upper sand mold 21 there are four die cavities respectively, die cavity one_to_one corresponding on die cavity on upper sand mold 21 and lower sand mold 22 and piece together four complete die cavities, four complete die cavities with sprue axle center for center of circle permutation distribution ringwise.
The shape of the butterfly oral area of the second medium-sized cavity 132 and position, main second core 24 that leans on ensures.And butterfly oral area is complex-shaped, size is little, traditional core manufacturing craft cannot ensure the shaping of core and dimensional accuracy, and second core 24 neck location, relatively other positions, thickness is less, easily fracture, substantially increase the percent defective of core, improve the difficulty of casting technique, therefore need to utilize following preparation method to make.
The manufacture using method of above-mentioned sand mould structure, it comprises the following steps:
A, moulding: be fixed on banker by needing the mould of the casing produced, at mould surface spraying releasing agent, by mold heated, on mould, assigned address places rising head, chill, is well placed cope, puts and add sand frame, sand hopper carries out putting sand, after putting sand, logical compressed air carries out pre-consolidation of blowing, and air is discharged by venting plug corresponding on mould; Following multipoint pressure contact passes through mechanical ramming, die sinking after 1-2S, and the unnecessary sand on sandbox surface is by doctor blade sandbox surface, and upper sand mold completes, and by moving case equipment, upper sand mold is moved to top box station; Lower sand mold is made by above-mentioned steps;
B, coremaking:
Make the first core, its order is as follows, core box is arranged on corresponding core shooter, die sinking cleaning box surface, spraying releasing agent, matched moulds penetrate sand 4 ~ 5s, heat, be blown into Triethylamine gas 20 ~ 40ml, solidification, wherein shooting pressure is 4 ~ 5bar, finally the core obtained is prescinded and penetrate Sha Kou, repair deflashing, core surface dip-coating alcohol radical graphite paint, obtains the first core after oven dry;
Make the second core, first choose particle comparatively thin comparatively rounding, epigranular, the high precoated sand of good permeability, the degree of packing, as the sand material of coremaking, is the intensity and the precision that ensure core, the hot box process of employing; Core box is arranged on core shooter, and wherein shooting pressure is 5 ~ 6.5bar, is heated to 250 ~ 270 DEG C, sintering time 200 ~ 250S, ensures that sinter layer thickness is greater than 6mm, after having sintered, core is taken out in die sinking, removes the burr burr on surface, must observe butterfly mouth place core color, as there is sepia, must do and scrap process, in order to avoid after the cast of follow-up molten iron, butterfly mouth place core is without enough surface strengths, cause distortion, cannot dimensional accuracy be ensured;
C, milling cup and core: top box station all mills out the cast gate of upper sand mold and core to come by milling cutter, blow away the floating sand on surface and broken sand;
D, mould assembling: the relevant position first and second core made being placed on lower sand mold, by repaking mechanism, foundry goods cope overturns 180 °, is incorporated on drag box, obtains complete sand mold;
E, cast: nodularization, inoculation are carried out to the molten iron of 1400 ~ 1450 ° in casting ladle, obtains qualified iron liquid; The slagging-off that deslagging agent carries out 0 ~ 1 minute must be put in casting ladle before cast; Iron liquid is poured into by the sprue position of sand mold, till cast gate is full; Foundry goods cools and to carry out after more than 75 minutes unpacking, clears up, takes out foundry goods in die cavity;
F, cleaning: the pouring and riser systems removing foundry goods, air outlet structure, carries out ball blast, grinding process, obtains described casing.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to the present invention's spirit change or modify, and all should be encompassed within protection scope of the present invention.
Claims (3)
1. the integrated sand mould structure of helical-lobe compressor casing, described casing comprises bearing block and chassis body, described chassis body is column, its inside offers the large-scale cavity along its Axis Extension, be connected with described large-scale cavity and two small-sized cavitys of cylindricality paralleling with described large-scale cavity axis of axis, its sidewall is provided with two projections, two projections are distributed in the both sides of large-scale cavity and offer medium-sized cavity respectively, when large-scale cavity horizontal positioned, it is the first half of marginal casing that one of them medium-sized cavity is positioned at large-scale cavity axis, be called the first medium-sized cavity, it is connected by intercommunicating pore with described large-scale cavity and small-sized cavity, first medium-sized cavity, large-scale cavity and small-sized cavity form the first cavity, it is the Lower Half of marginal casing that another medium-sized cavity is positioned at large-scale cavity axis, be called the second medium-sized cavity, it has butterfly oral area, it is characterized in that: bearing block and the integrated sand mould structure of chassis body can be made to comprise lower sand mold upper surface at least being offered the die cavity that matches with the Lower Half lateral surface of described casing, offer the upper sand mold of the die cavity matched with the first half lateral surface of described casing, be arranged on the second core on lower sand mold and be arranged on, the first core between lower sand mold, the surface profile of the first core is identical with the profile of the first cavity, the surface profile of the second core is identical with the profile of the second medium-sized cavity, described upper sand mold offers the venthole in multiple connection die cavity and the sand mould structure external world and one for injecting the sprue of molten iron.
2. the integrated sand mould structure of helical-lobe compressor casing according to claim 1, it is characterized in that: described lower sand mold and upper sand mold have four die cavities respectively, the die cavity one_to_one corresponding on the die cavity on upper sand mold and lower sand mold and piece together four complete die cavities distributed for center of circle circular array with sprue axle center.
3. use a method for the integrated sand mould structure casting of the helical-lobe compressor casing described in claim 1 or 2 casing, it is characterized in that, it comprises the following steps:
A, moulding: be fixed on banker by needing the mould of the casing produced, at mould surface spraying releasing agent, by described mold heated, on mould, assigned address places rising head, chill, is well placed cope, puts and add sand frame, sand hopper carries out putting sand, after putting sand, logical compressed air carries out pre-consolidation of blowing, and air is discharged by venting plug corresponding on mould; Following multipoint pressure contact passes through mechanical ramming, die sinking after 1-2s, and the unnecessary sand on sandbox surface is by doctor blade sandbox surface, and upper sand mold completes, and upper sand mold is moved to top box station; Lower sand mold is made by above-mentioned steps;
B, coremaking:
Make the first core, its order is as follows, core box is arranged on corresponding core shooter, die sinking cleaning box surface, spraying releasing agent, matched moulds penetrate sand 4 ~ 5s, heat, be blown into Triethylamine gas 20 ~ 40ml, solidification, wherein shooting pressure is 4 ~ 5bar, finally the core obtained is prescinded and penetrate Sha Kou, repair deflashing, core surface dip-coating alcohol radical graphite paint, obtains the first core after oven dry;
Make the second core, first choose particle comparatively thin comparatively rounding, epigranular, the high precoated sand of good permeability, the degree of packing, as the sand material of coremaking, is the intensity and the precision that ensure core, the hot box process of employing; Core box is arranged on core shooter, and wherein shooting pressure is 5 ~ 6.5bar, is heated to 250 ~ 270 DEG C, sintering time 200 ~ 250s, ensures that sinter layer thickness is greater than 6mm, after having sintered, core is taken out in die sinking, removes the burr burr on surface, must observe butterfly mouth place core color, as there is sepia, must do and scrap process, in order to avoid after the cast of follow-up molten iron, butterfly mouth place core is without enough surface strengths, cause distortion, cannot dimensional accuracy be ensured;
C, milling cup and core: top box station all mills out the cast gate of upper sand mold and core to come by milling cutter, blow away the floating sand on surface and broken sand;
D, mould assembling: the relevant position first and second core made being placed on lower sand mold, by repaking mechanism, foundry goods cope overturns 180 °, is incorporated on drag box, obtains complete sand mold;
E, cast: inoculation is carried out to the molten iron of 1400 ~ 1450 DEG C in casting ladle, obtains qualified iron liquid; The slagging-off that deslagging agent carries out 0 ~ 1 minute must be put in casting ladle before cast; Iron liquid is poured into by the sprue position of sand mold, till cast gate is full; Foundry goods cools and to carry out after more than 75 minutes unpacking, clears up, takes out foundry goods in die cavity;
F, cleaning: the pouring and riser systems removing foundry goods, air outlet structure, carries out ball blast, grinding process, obtains described foundry goods.
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| CN202667560U (en) * | 2012-05-29 | 2013-01-16 | 芜湖市金贸流体科技股份有限公司 | Air compressor cylinder block shell die |
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