CN107716866A - A kind of production technology of water-saving closet sewage draining valve - Google Patents

Abstract

The invention discloses a kind of production technology of water-saving closet sewage draining valve, following steps are specifically included：Sand mold-smelting and pouring-heat treatment-Surface Machining is made according to the shape of valve；The simple production process is easy, low production cost, and the valve produced has good fire resistance, increases the service life.

Description

A kind of production technology of water-saving closet sewage draining valve

Technical field

The present invention relates to a kind of valve, and in particular to a kind of production technology of water-saving closet sewage draining valve.

Background technology

China's shortage of water resources problem getting worse, according to statistics, toilet flushing accounts for the 40% of people's daily water consumption with water, Existing closet is generally complicated, is connected with water tank, and stool and urine is washed away by the water in water tank, existing closet Because water tank needs water, quantitatively washed away every time using the water in water tank, the waste of water resource can be caused, because water saving is just Device is part and parcel, and the sewage draining valve in water-saving closet also has a very important role, and valve (famen) is fluid conveying Control unit in system, there is cut-off, regulation, water conservancy diversion, prevent the functions such as adverse current, voltage stabilizing, shunting or overflow pressure relief, for flowing The valve of body control system, the various valves used into extremely complex robot control system(RCS) from simplest stop valve, its kind It is quite various with specification, valve can be used for control empty gas and water, steam, various Korrosionsmediums, mud, oil product, liquid metal and The flowing of all kinds fluid such as radiating medium, valve are also divided into cast iron valve, cast steel valve, stainless valve according to material (201,304,316 etc.), chrome-molybdenum steel valve, Chrominm-molybdenum-vanadium steel valve, dual phase steel valve, Plastic valve, nonstandard customized grade valve material Matter, at present in cast steel industry, steel-casting will generally manufacture mould in casting, cast carries out the post-processing of valve again, place The defects of it is improper to manage, and obtained cast steel easily cracks, sand holes, stomata, the quality of product is have impact on, it is therefore, rational raw Production. art turns into those skilled in the art's technical problem urgently to be resolved hurrily.

The content of the invention

The technical problems to be solved by the invention are the shortcomings that presence for above prior art, propose a kind of water saving just The production technology of device sewage draining valve, the simple production process is easy, low production cost, and the valve produced has well resistance to Fire, increase the service life.

The present invention solve above technical problem technical scheme be：

A kind of production technology of water-saving closet sewage draining valve, specifically includes following steps：

（1）Sand mold is made according to the shape of valve

A. low-temperature wax and mechanical casting technology are used, makes wax-pattern consistent with cast member and including insulated feeder, and to wax Mould is repaired, and wax base cleaning agent is added in supersonic wave cleaning machine afterwards cleans to wax-pattern；

B. shell model sand mold is made on obtained wax-pattern, is specially：On the position that wax-pattern places insulated feeder, EVA adhesive film is used The surface for placing insulated feeder is covered, is contaminated to prevent the surface；First, glued in wax pattern surface dip-coating with zirconium powder and Ludox Tie agent and prepare slurries, the viscosity number of the slurries was at 45~50 seconds, then, with the zircon sand of 150 mesh in the wax-pattern by dip-coating slurries Surface carries out manually floating sand, and residual slurry and zircon sand in the EVA adhesive film should be cleared up after floating sand, by the wax-pattern after artificial floating sand Spontaneously dried, drying time is 9~12 hours, and the residual slurry cleared up in the EVA adhesive film；

C. steam dewaxing is used, the pressure of steam is 0.6MPa, and the time is 25~45 minutes, and first should be emitted insulation before dewaxing The EVA adhesive film of oral area position is removed, and shell mould is made, and is incubated 1.5 hours at 450 degrees Celsius to obtained shell mould, cooling of finally coming out of the stove；

D. the shell mould after handling is put into the sandbox prepared by formative technology, and blend compounds band, which seals, is used for pouring for cast on the shell mould Mouth and insulated feeder, are then placed in the mixed sand by preparation, ram-jolt are carried out with foundry jolter again after piling mixed sand, are formed Sand mold；

（2）The raw material of valve is added in smelting furnace, the temperature in smelting furnace is brought up to 1520 degrees Celsius to 1590 degrees Celsius, raw material It is smelted to form material liquid；

Valve raw material includes following components by mass percentage：

Al：3-5%, Mn：1.15-1.17%, Zn：0.5-1%, Si：0.02-0.03%, Co：0.1-0.3%, Cr：4-7%, C：0.15- 0.17%V：0.1-0.4%, S≤0.025%, P≤0.025%, Cu≤0.20%, Pa：0.05-0.08%, rare earth element 0.5-0.8%, Remaining is Fe；

Rare earth is pressed and includes following component by weight percentage：Y：5-7%, Sc：7-11%, Gd：9-11%, Sm：18-20%, Pr：9- 11%, surplus La, above each component sum are 100%.

（3）Then material liquid is poured into a mould into sand mold, poring rate 67-70kg/s, duration of pouring 15-20s, is being poured into a mould During a small amount of alterant is added into material liquid；

The chemical analysis mass percent of the alterant is：Rare earth silicon 92%, bismuth ingot 3%, magnesium ingot 3%, aluminium ingot 2%；

（4）The whole strand that pours is incubated 10-13h together with sand mold after cast, to eliminate residual stress, taking-up pours strand and is air-cooled to room Temperature, then carried out to pouring strand successively through normalizing, tempering and Tempering and Quenching；

（5）By step（4）Pouring after strand is cooled to room temperature after middle processing obtains valve semi-finished product, and surface is cleared up to this finished product, The ridges such as cast gate, rising head, relief grinding burr and fash are cut off, clear up residual sand again, you can obtain water-saving closet sewage draining valve.

The technical scheme that further limits of the present invention as：

The production technology of foregoing water-saving closet sewage draining valve, Tempering and Quenching are specially：

Using a normalizing+double tempering, first time temperature is more than second of temperature；Normalizing：Formal fiery temperature 720-730 DEG C, to temperature after be incubated 9-11min；It is tempered for the first time：Using heat stepwise, first paragraph heating-up temperature is 800-820 DEG C, to temperature after be incubated 9-12min, second segment heating-up temperature is 785-795 DEG C, to temperature after be incubated 10-13min, be then air-cooled to Second of normalizing is carried out after room temperature；Second of tempering：Using heat stepwise, first paragraph heating-up temperature is 720-730 DEG C of heating, is arrived Be incubated 15-18min after temperature, second segment heating-up temperature is 700-715 DEG C of heating, to temperature after be incubated 9-11min.

The production technology of foregoing water-saving closet sewage draining valve, the surface spraying layer protective layer of valve, protective layer press quality Number meter includes following components：

Aqueous acrylic modified polyaminoester emulsion：10-15 parts, aluminum oxide：10-12 parts；Zinc oxide：15-20 parts；Firebrake ZB：1-3 Part；Silane coupler：5-10 parts；White carbon：8-15 parts；Clay：5-7 parts；Diatomite：4-5 parts；Diphenylguanidine：1-3 parts, prevent old Agent 4040NA：2-4 parts, altax：0.5-1 parts, auxiliary material：0.1-0.3 parts；

Auxiliary material is compound rare-earth, and the compound rare-earth is pressed and includes following component by weight percentage：Y：13-15%, Sc：16-18%, Gd：9-11%, Sm：18-20%, Pr：9-11%, surplus La, above each component sum are 100%.

The beneficial effects of the invention are as follows：

After pouring the conditioned heat treatment of injection, tensile strength, yield strength, room temperature impact absorption is attacked and hardness has all reached casting Standard is simultaneously strengthened.

The present invention can be made to pour casting billet surface generation 1-3mm thickness tempered martensite, be effectively improved by Tempering and Quenching Its water erosion resistent ability；In addition, in double tempering second temperature be less than first time temperature can reduce surface and The temperature difference of center portion, make to pour strand thickness direction fine microstructures uniform；It is tempered after normalizing and further reduces surface and center portion Temperature difference, so that surface to center portion performance reaches unanimity.

The compound rare-earth of the present invention, because the metallic atomic radius of above rare earth element is big and rare earth has higher work Property, it is easy to the space of storeroom is filled up, meanwhile, rare earth element is easily and the element compounds such as oxygen, sulphur generate the high compound of fusing point, The addition of compound rare-earth improves the dispersiveness and compatibility that prepare material to a certain extent, product mix is uniformly also improved Car is protected not put the anti-flammability of layer.

The performance of protective layer of the present invention is as follows：

Tensile strength：(5000)34.5Mpa；Elongation at break：450%；Tearing strength：Die C- (500) 87.5kN/m, D470- (150)26.2kN/m；Compression：22 hours, 70 DEG C：430%；Resilience：20%；It is wear-resistant：NBS indexs 375；Brittle temperature<- 70℃；Proportion：24℃ 1.14.

Embodiment

Embodiment 1

The present embodiment provides a kind of production technology of water-saving closet sewage draining valve, specifically includes following steps：

（1）Sand mold is made according to the shape of valve

A. low-temperature wax and mechanical casting technology are used, makes wax-pattern consistent with cast member and including insulated feeder, and to wax Mould is repaired, and wax base cleaning agent is added in supersonic wave cleaning machine afterwards cleans to wax-pattern；

B. shell model sand mold is made on obtained wax-pattern, is specially：On the position that wax-pattern places insulated feeder, EVA adhesive film is used The surface for placing insulated feeder is covered, is contaminated to prevent the surface；First, glued in wax pattern surface dip-coating with zirconium powder and Ludox Tie agent and prepare slurries, the viscosity number of the slurries was at 45 seconds, then, with the zircon sand of 150 mesh in the wax pattern surface by dip-coating slurries Manually floating sand is carried out, residual slurry and zircon sand in the EVA adhesive film should be cleared up after floating sand, the wax-pattern after artificial floating sand is carried out Spontaneously dry, drying time is 9 hours, and the residual slurry cleared up in the EVA adhesive film；

C. steam dewaxing is used, the pressure of steam is 0.6MPa, and the time is 25 minutes, and should be first by insulated feeder portion before dewaxing The EVA adhesive film of position is removed, and shell mould is made, and is incubated 1.5 hours at 450 degrees Celsius to obtained shell mould, cooling of finally coming out of the stove；

D. the shell mould after handling is put into the sandbox prepared by formative technology, and blend compounds band, which seals, is used for pouring for cast on the shell mould Mouth and insulated feeder, are then placed in the mixed sand by preparation, ram-jolt are carried out with foundry jolter again after piling mixed sand, are formed Sand mold；

（2）The raw material of valve is added in smelting furnace, the temperature in smelting furnace is brought up to 1520 degrees Celsius, raw material is smelted to form original Feed liquid；

Valve raw material includes following components by mass percentage：

Al：3%, Mn：1.15%, Zn：0.5%, Si：0.02%, Co：0.1%, Cr：4%, C：0.15%V：0.1%, S≤0.025%, P≤ 0.025%, Cu≤0.20%, Pa：0.05%, rare earth element 0.5%, remaining is Fe；

Rare earth is pressed and includes following component by weight percentage：Y：5%, Sc：7%, Gd：9%, Sm：18%, Pr：9%, surplus La, with Upper each component sum is 100%.

（3）Then material liquid, poring rate 67kg/s, duration of pouring 15s, in casting process are poured into a mould into sand mold A small amount of alterant is added into material liquid；

The chemical analysis mass percent of alterant is：Rare earth silicon 92%, bismuth ingot 3%, magnesium ingot 3%, aluminium ingot 2%；

（4）The whole strand that pours is incubated 10h together with sand mold after cast, to eliminate residual stress, taking-up pours strand and is air-cooled to room temperature, Then carried out to pouring strand successively through normalizing, tempering and Tempering and Quenching；

（5）By step（4）Pouring after strand is cooled to room temperature after middle processing obtains valve semi-finished product, and surface is cleared up to this finished product, The ridges such as cast gate, rising head, relief grinding burr and fash are cut off, clear up residual sand again, you can obtain water-saving closet sewage draining valve.

In the present embodiment, Tempering and Quenching is specially：

Using a normalizing+double tempering, first time temperature is more than second of temperature；Normalizing：Formal fiery temperature 720 DEG C, to temperature after be incubated 9min；It is tempered for the first time：Using heat stepwise, first paragraph heating-up temperature is 800 DEG C, to temperature after be incubated 9min, second segment heating-up temperature be 785 DEG C, to temperature after be incubated 10min, carry out second of normalizing after being then air-cooled to room temperature；The Double tempering：Using heat stepwise, first paragraph heating-up temperature is 720 DEG C of heating, to temperature after be incubated 15min, second segment heating temperature Spend for 700 DEG C heating, to temperature after be incubated 9min.

In the present embodiment, the surface spraying layer protective layer of valve, protective layer include following components according to the mass fraction：

Aqueous acrylic modified polyaminoester emulsion：10 parts, aluminum oxide：10 parts；Zinc oxide：15 parts；Firebrake ZB：1 part；It is silane coupled Agent：5 parts；White carbon：8 parts；Clay：5 parts；Diatomite：4 parts；Diphenylguanidine：1 part, age resistor 4040NA：2 parts, altax： 0.5 part, auxiliary material：0.1 part；

Auxiliary material is compound rare-earth, and compound rare-earth is pressed and includes following component by weight percentage：Y：13%, Sc：16%, Gd：9%, Sm： 18%, Pr：9%, surplus La, above each component sum are 100%.

Embodiment 2

The present embodiment provides a kind of production technology of water-saving closet sewage draining valve, specifically includes following steps：

（1）Sand mold is made according to the shape of valve

A. low-temperature wax and mechanical casting technology are used, makes wax-pattern consistent with cast member and including insulated feeder, and to wax Mould is repaired, and wax base cleaning agent is added in supersonic wave cleaning machine afterwards cleans to wax-pattern；

B. shell model sand mold is made on obtained wax-pattern, is specially：On the position that wax-pattern places insulated feeder, EVA adhesive film is used The surface for placing insulated feeder is covered, is contaminated to prevent the surface；First, glued in wax pattern surface dip-coating with zirconium powder and Ludox Tie agent and prepare slurries, the viscosity number of the slurries was at 50 seconds, then, with the zircon sand of 150 mesh in the wax pattern surface by dip-coating slurries Manually floating sand is carried out, residual slurry and zircon sand in the EVA adhesive film should be cleared up after floating sand, the wax-pattern after artificial floating sand is carried out Spontaneously dry, drying time is 12 hours, and the residual slurry cleared up in the EVA adhesive film；

C. steam dewaxing is used, the pressure of steam is 0.6MPa, and the time is 45 minutes, and should be first by insulated feeder portion before dewaxing The EVA adhesive film of position is removed, and shell mould is made, and is incubated 1.5 hours at 450 degrees Celsius to obtained shell mould, cooling of finally coming out of the stove；

D. the shell mould after handling is put into the sandbox prepared by formative technology, and blend compounds band, which seals, is used for pouring for cast on the shell mould Mouth and insulated feeder, are then placed in the mixed sand by preparation, ram-jolt are carried out with foundry jolter again after piling mixed sand, are formed Sand mold；

（2）The raw material of valve is added in smelting furnace, the temperature in smelting furnace is brought up to 1590 degrees Celsius, raw material is smelted to form original Feed liquid；

Valve raw material includes following components by mass percentage：

Al：5%, Mn：1.17%, Zn：1%, Si：0.03%, Co：0.3%, Cr：7%, C：0.17%V：0.4%, S≤0.025%, P≤ 0.025%, Cu≤0.20%, Pa：0.08%, rare earth element 0.8%, remaining is Fe；

Rare earth is pressed and includes following component by weight percentage：Y：7%, Sc：11%, Gd：11%, Sm：20%, Pr：11%, surplus La, Above each component sum is 100%.

（3）Then material liquid is poured into a mould into sand mold, poring rate 70kg/s, duration of pouring 15-20s, was being poured into a mould A small amount of alterant is added in journey into material liquid；

The chemical analysis mass percent of alterant is：Rare earth silicon 92%, bismuth ingot 3%, magnesium ingot 3%, aluminium ingot 2%；

（4）The whole strand that pours is incubated 13h together with sand mold after cast, to eliminate residual stress, taking-up pours strand and is air-cooled to room temperature, Then carried out to pouring strand successively through normalizing, tempering and Tempering and Quenching；

（5）By step（4）Pouring after strand is cooled to room temperature after middle processing obtains valve semi-finished product, and surface is cleared up to this finished product, The ridges such as cast gate, rising head, relief grinding burr and fash are cut off, clear up residual sand again, you can obtain water-saving closet sewage draining valve.

In the present embodiment, Tempering and Quenching is specially：

Using a normalizing+double tempering, first time temperature is more than second of temperature；Normalizing：Formal fiery temperature 730 DEG C, to Wen Houbao 11min；It is tempered for the first time：Using heat stepwise, first paragraph heating-up temperature is 820 DEG C, to temperature after be incubated 12min, second segment heating-up temperature be 795 DEG C, to temperature after be incubated 13min, carry out second of normalizing after being then air-cooled to room temperature；The Double tempering：Using heat stepwise, first paragraph heating-up temperature is 730 DEG C of heating, to temperature after be incubated 18min, second segment heating temperature Spend for 715 DEG C heating, to temperature after be incubated 11min.

In the present embodiment, the surface spraying layer protective layer of valve, protective layer include following components according to the mass fraction：

Aqueous acrylic modified polyaminoester emulsion：15 parts, aluminum oxide：12 parts；Zinc oxide：20 parts；Firebrake ZB：3 parts；It is silane coupled Agent：10 parts；White carbon：15 parts；Clay：7 parts；Diatomite：5 parts；Diphenylguanidine：3 parts, age resistor 4040NA：4 parts, accelerator DM：1 part, auxiliary material：0.3 part；

Auxiliary material is compound rare-earth, and compound rare-earth is pressed and includes following component by weight percentage：Y：15%, Sc：18%, Gd：11%, Sm： 20%, Pr：11%, surplus La, above each component sum are 100%.

Embodiment 3

The present embodiment provides a kind of production technology of water-saving closet sewage draining valve, specifically includes following steps：

（1）Sand mold is made according to the shape of valve

A. low-temperature wax and mechanical casting technology are used, makes wax-pattern consistent with cast member and including insulated feeder, and to wax Mould is repaired, and wax base cleaning agent is added in supersonic wave cleaning machine afterwards cleans to wax-pattern；

B. shell model sand mold is made on obtained wax-pattern, is specially：On the position that wax-pattern places insulated feeder, EVA adhesive film is used The surface for placing insulated feeder is covered, is contaminated to prevent the surface；First, glued in wax pattern surface dip-coating with zirconium powder and Ludox Tie agent and prepare slurries, the viscosity number of the slurries was at 48 seconds, then, with the zircon sand of 150 mesh in the wax pattern surface by dip-coating slurries Manually floating sand is carried out, residual slurry and zircon sand in the EVA adhesive film should be cleared up after floating sand, the wax-pattern after artificial floating sand is carried out Spontaneously dry, drying time is 11 hours, and the residual slurry cleared up in the EVA adhesive film；

C. steam dewaxing is used, the pressure of steam is 0.6MPa, and the time is 30 minutes, and should be first by insulated feeder portion before dewaxing The EVA adhesive film of position is removed, and shell mould is made, and is incubated 1.5 hours at 450 degrees Celsius to obtained shell mould, cooling of finally coming out of the stove；

D. the shell mould after handling is put into the sandbox prepared by formative technology, and blend compounds band, which seals, is used for pouring for cast on the shell mould Mouth and insulated feeder, are then placed in the mixed sand by preparation, ram-jolt are carried out with foundry jolter again after piling mixed sand, are formed Sand mold；

（2）The raw material of valve is added in smelting furnace, the temperature in smelting furnace is brought up to 1570 degrees Celsius, raw material is smelted to form original Feed liquid；

Valve raw material includes following components by mass percentage：

Al：4%, Mn：1.16%, Zn：0.8%, Si：0.025%, Co：0.2%, Cr：5%, C：0.16%, V：0.2 %, S≤0.025%, P≤0.025%, Cu≤0.20%, Pa：0.07%, rare earth element 0.6%, remaining is Fe；

Rare earth is pressed and includes following component by weight percentage：Y：6%, Sc：9%, Gd：10%, Sm：19%, Pr：10%, surplus La, Above each component sum is 100%.

（3）Then material liquid, poring rate 69kg/s, duration of pouring 18s, in casting process are poured into a mould into sand mold A small amount of alterant is added into material liquid；

The chemical analysis mass percent of alterant is：Rare earth silicon 92%, bismuth ingot 3%, magnesium ingot 3%, aluminium ingot 2%；

（4）The whole strand that pours is incubated 12h together with sand mold after cast, to eliminate residual stress, taking-up pours strand and is air-cooled to room temperature, Then carried out to pouring strand successively through normalizing, tempering and Tempering and Quenching；

（5）By step（4）Pouring after strand is cooled to room temperature after middle processing obtains valve semi-finished product, and surface is cleared up to this finished product, The ridges such as cast gate, rising head, relief grinding burr and fash are cut off, clear up residual sand again, you can obtain water-saving closet sewage draining valve.

In the present embodiment, Tempering and Quenching is specially：

Using a normalizing+double tempering, first time temperature is more than second of temperature；Normalizing：Formal fiery temperature 725 DEG C, to temperature after be incubated 10min；It is tempered for the first time：Using heat stepwise, first paragraph heating-up temperature is 810 DEG C, to temperature after be incubated 11min, second segment heating-up temperature be 789 DEG C, to temperature after be incubated 12min, carry out second of normalizing after being then air-cooled to room temperature；The Double tempering：Using heat stepwise, first paragraph heating-up temperature is 725 DEG C of heating, to temperature after be incubated 16min, second segment heating temperature Spend for 709 DEG C heating, to temperature after be incubated 10min.

In the present embodiment, the surface spraying layer protective layer of valve, protective layer include following components according to the mass fraction：

Aqueous acrylic modified polyaminoester emulsion：12 parts, aluminum oxide：11 parts；Zinc oxide：18 parts；Firebrake ZB：2 parts；It is silane coupled Agent：8 parts；White carbon：9 parts；Clay：6 parts；Diatomite：5 parts；Diphenylguanidine：2 parts, age resistor 4040NA：3 parts, altax： 0.8 part, auxiliary material：0.2 part；

Auxiliary material is compound rare-earth, and compound rare-earth is pressed and includes following component by weight percentage：Y：14%, Sc：17, Gd：10%, Sm： 19%, Pr：10%, surplus La, above each component sum are 100%.

In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape Into technical scheme, all fall within the protection domains of application claims.

Claims (3)

1. a kind of production technology of water-saving closet sewage draining valve, specifically includes following steps：

（1）Sand mold is made according to the shape of valve

A. low-temperature wax and mechanical casting technology are used, makes wax-pattern consistent with cast member and including insulated feeder, and to wax Mould is repaired, and wax base cleaning agent is added in supersonic wave cleaning machine afterwards cleans to wax-pattern；

B. shell model sand mold is made on obtained wax-pattern, is specially：On the position that wax-pattern places insulated feeder, EVA adhesive film is used The surface for placing insulated feeder is covered, is contaminated to prevent the surface；First, glued in wax pattern surface dip-coating with zirconium powder and Ludox Tie agent and prepare slurries, the viscosity number of the slurries was at 45~50 seconds, then, with the zircon sand of 150 mesh in the wax-pattern by dip-coating slurries Surface carries out manually floating sand, and residual slurry and zircon sand in the EVA adhesive film should be cleared up after floating sand, by the wax-pattern after artificial floating sand Spontaneously dried, drying time is 9~12 hours, and the residual slurry cleared up in the EVA adhesive film；

C. steam dewaxing is used, the pressure of steam is 0.6MPa, and the time is 25~45 minutes, and first should be emitted insulation before dewaxing The EVA adhesive film of oral area position is removed, and shell mould is made, and is incubated 1.5 hours at 450 degrees Celsius to obtained shell mould, cooling of finally coming out of the stove；

D. the shell mould after handling is put into the sandbox prepared by formative technology, and blend compounds band, which seals, is used for pouring for cast on the shell mould Mouth and insulated feeder, are then placed in the mixed sand by preparation, ram-jolt are carried out with foundry jolter again after piling mixed sand, are formed Sand mold；

（2）The raw material of valve is added in smelting furnace, the temperature in smelting furnace is brought up to 1520 degrees Celsius to 1590 degrees Celsius, raw material It is smelted to form material liquid；

Valve raw material includes following components by mass percentage：

Al：3-5%, Mn：1.15-1.17%, Zn：0.5-1%, Si：0.02-0.03%, Co：0.1-0.3%, Cr：4-7%, C：0.15- 0.17%V：0.1-0.4%, S≤0.025%, P≤0.025%, Cu≤0.20%, Pa：0.05-0.08%, rare earth element 0.5-0.8%, Remaining is Fe；

Rare earth is pressed and includes following component by weight percentage：Y：5-7%, Sc：7-11%, Gd：9-11%, Sm：18-20%, Pr：9- 11%, surplus La, above each component sum are 100%；

（3）Then material liquid, poring rate 67-70kg/s, duration of pouring 15-20s, in casting process are poured into a mould into sand mold It is middle that a small amount of alterant is added into material liquid；

The chemical analysis mass percent of the alterant is：Rare earth silicon 92%, bismuth ingot 3%, magnesium ingot 3%, aluminium ingot 2%；

（4）The whole strand that pours is incubated 10-13h together with sand mold after cast, to eliminate residual stress, taking-up pours strand and is air-cooled to room Temperature, then carried out to pouring strand successively through normalizing, tempering and Tempering and Quenching；

（5）By step（4）Pouring after strand is cooled to room temperature after middle processing obtains valve semi-finished product, and surface is cleared up to this finished product, The ridges such as cast gate, rising head, relief grinding burr and fash are cut off, clear up residual sand again, you can obtain water-saving closet sewage draining valve.

2. the production technology of water-saving closet sewage draining valve according to claim 1, it is characterised in that：Tempering and Quenching is specific For：

Using a normalizing+double tempering, first time temperature is more than second of temperature；Normalizing：Formal fiery temperature 720-730 DEG C, to temperature after be incubated 9-11min；It is tempered for the first time：Using heat stepwise, first paragraph heating-up temperature is 800-820 DEG C, to temperature after be incubated 9-12min, second segment heating-up temperature is 785-795 DEG C, to temperature after be incubated 10-13min, be then air-cooled to Second of normalizing is carried out after room temperature；Second of tempering：Using heat stepwise, first paragraph heating-up temperature is 720-730 DEG C of heating, is arrived Be incubated 15-18min after temperature, second segment heating-up temperature is 700-715 DEG C of heating, to temperature after be incubated 9-11min.

3. the production technology of water-saving closet sewage draining valve according to claim 1, it is characterised in that：The surface spraying of valve Layer protective layer, protective layer include following components according to the mass fraction：

Aqueous acrylic modified polyaminoester emulsion：10-15 parts, aluminum oxide：10-12 parts；Zinc oxide：15-20 parts；Firebrake ZB：1-3 Part；Silane coupler：5-10 parts；White carbon：8-15 parts；Clay：5-7 parts；Diatomite：4-5 parts；Diphenylguanidine：1-3 parts, prevent old Agent 4040NA：2-4 parts, altax：0.5-1 parts, auxiliary material：0.1-0.3 parts；

Auxiliary material is compound rare-earth, and the compound rare-earth is pressed and includes following component by weight percentage：Y：13-15%, Sc：16-18%, Gd：9-11%, Sm：18-20%, Pr：9-11%, surplus La, above each component sum are 100%.