CN105964911A - Method for preparing unleaded brass tap - Google Patents
Method for preparing unleaded brass tap Download PDFInfo
- Publication number
- CN105964911A CN105964911A CN201610504899.XA CN201610504899A CN105964911A CN 105964911 A CN105964911 A CN 105964911A CN 201610504899 A CN201610504899 A CN 201610504899A CN 105964911 A CN105964911 A CN 105964911A
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- casting
- lead
- core
- die cavity
- cast
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a method for preparing an unleaded brass tap. The method comprises the step of casting molding of an unleaded brass liquid via a gravity casting device, and the gravity casting device comprises an upper half mold, a lower half mold and a sand core. By adoption of the technical scheme, the method has the following beneficial effects: during casting, the quantity of resin is increased, the casting temperature is controlled to be 1,000-1,010 DEG C, the cross sections of an inner gate and an outer gate are increased, the processes of adding chillers at material shrinkage positions and accelerating solidification of the loose core during casting, as well as supplementing shrinkage by use of a pouring gate and the gates, can greatly reduce the product problems of misrun, multiple pores, much slag eyes, material shrinkage, cracks and the like, and vent holes formed at dead angles of a cavity mode formed by a water inlet part, a water outlet part and a valve core mounting part which are in the shape of the sand core are communicated with a mold cavity, so that pores generated during casting, which cause holes during mold opening and further lead to product unattractiveness, can be reduced.
Description
Technical field
The present invention relates to faucet casting technology field, particularly to the preparation of a kind of lead-free reflow tap
Method.
Background technology
In daily life, faucet is used to control the valve switch of current size, and faucet is a kind of
The product that appearance structure is relative complex, so its faucet body is typically one-body molded by casting technique, casting
Modeling tool is a part for casting frock, is to make cast member molding and obtain the necessary equipment of required foundry goods.
The main material of domestic production faucet is pyrite HPb59 at present, and its lead content requires to be less than
1.9%, due to the disappearance of standard, in order to reduce cost, improve the cutting ability of pyrite, some manufacturer
Pyrite lead content is used to reach 3%-6%.The temperature of faucet casting is generally 1053 DEG C, and lead is molten
Point is 327.5 DEG C, and so when molding, lead is segregated in surfaces externally and internally, and the lead content on surface is than internal high 3-5
Times, use deleading technique the lead on surface can be removed, but the water flowed in faucet can destroy and wash lead
Surface, is formed " corrosion ", and internal lead ion comes out again, and the lead content so separated out increases again
?.To this end, the U.S. is proposed low lead bronze, from material, solves scorification go wrong.
The casting mould of the casting technique of existing ledrite faucet generally comprises upper mold section and lower half
Mould, is provided with core between upper mold section and lower half, the die joint of described lower half is provided with cast gate, from dragon during cast
The rear portion of head body pours into, and this kind of mould has a simple in construction, easily manufactured advantage, but, it waters
The setting of mouth, the time that copper water pours into the time of banishing is longer, is only applicable to have excellent cold and hot working performance
The moulding by casting of ledrite water, if be applied to bismuth-containing Bi without lead bronze, when casting, by
In, bismuth-containing Bi has, relative to common lead pyrite, the characteristic that mobility is poor without lead bronze, according to above-mentioned
Common lead brass casting die casting, the position of its cast gate arranges and may result in the time put without lead bronze liquid stream
Longer, it is unfavorable for that liquid metal is rapidly filled with die cavity, during product solidification, temperature everywhere is uneven, no
Can realize solidifying, easy hot tearing during product solidification simultaneously, and due to each place variable thickness of above-mentioned mould
Sample, the thermal balance of mould is poor, and the time of product each position cooling is the most different, and product moulding by casting cools down
Time, because each spot temperature of mould is uneven, cause that each spot temperature of product is uneven can not be cooled down simultaneously,
Cause the non-uniform temperature of each place, during cooling, be easily formed the micro-strong stricture of vagina of thermal stress.It addition, above-mentioned mould does not has
If molten metal feeding mouth, product can shrink in process of setting and cannot cover, and the shrinkage depression of product will shadow
Ring the quality of product, the function of product can be affected time serious, make the quality of product decline.
Chinese Patent Application No. is: 201410269835.7 disclose the preparation side of a kind of lead-free reflow tap
Method, is filled by the step of gravity casting device moulding by casting, described gravitational casting including by lead-free reflow liquid
Put and include upper mold section, female die and core, be correspondingly provided with respectively between upper mold section with female die and mate tap
The die cavity of body profile, described core is located in the die cavity between upper mold section and female die, outside this core
Shape and faucet body water entering section, outlet part and the mating shapes of spool installation portion inner chamber, core and die cavity
Between form cast die cavity, described upper mold section or female die are additionally provided with for the cast gate that pours into without lead bronze water,
This cast gate is connected with cast die cavity, and this cast gate has ingate and pouring basin, and described ingate is correspondingly arranged
At the cast die cavity for molding faucet body water entering section.The ingate of cast gate is correspondingly arranged by this patent
At the cast die cavity for molding faucet body water entering section, outside water entering section, during cast, pour into liquid gold
Belonging to, the water entering section of liquid metal to product flow to spool installation portion and arrives outlet part again, this pouring type, liquid
State metal is transferred suddenly when watering to product spool installation portion, so that liquid metal flows resistance becomes suddenly
Greatly, thus this pouring type is unfavorable for that liquid metal is rapidly filled with die cavity equally, during product solidification, and water inlet
Portion, outlet part, each portion temperature imbalance of spool installation portion, it is impossible to realizing solidifying, product solidifies simultaneously
Time easy hot tearing, and this patent is in order to solve traditional moulds each place variable thickness, and the thermal balance of mould is poor,
Causing the uneven problem that can not simultaneously cool down of each spot temperature of product, this patent sets in the thick general goal of mould
Put spout hole, thus allow spilling molten metal heat at this so that each spot temperature of mould is uniform, has
It is beneficial to the thermal balance everywhere of mould, thus reduces product temperature difference everywhere, each position of product can be made
Cooling down, it is to avoid fire check, although this mould can reduce to a certain extent, solution is thermally equilibrated asks simultaneously
Topic, but the setting of spout hole makes this mould structure relative complex, and manufacturing cost is high, and formed product
Time be positioned at each spout hole and also can form overflow block 42 (referring to this patent specification accompanying drawing 2), should be from
The dynamic overflow block formed makes the material cost of faucet body and processing cost all increase much, also increases simultaneously
Add the workload of the follow-up arrangement of product, again improve casting technique casting time misrun, pore is many, slag
Kong Duo, contracting material, crack problem.
Summary of the invention
For the problems referred to above, the present invention proposes the preparation method of a kind of lead-free reflow tap, again improves
Misrun during casting technique casting, pore is many, cinder hole is many, contracting material, crack problem.
For solving this technical problem, the present invention takes below scheme: the preparation side of a kind of lead-free reflow tap
Method, including by lead-free reflow liquid by the step of gravity casting device moulding by casting, described gravitational casting
Device includes upper mold section, female die and core, is respectively equipped with and faucet body between upper mold section and female die
The die cavity of the profile of coupling, is provided with core in the die cavity between described upper mold section and female die, described
The casting shape of the profile of core and faucet body water entering section, outlet part and spool installation portion inner chamber is mutually
Join, the water entering section of core profile, outlet part and spool installation portion form chamber mould, described upper mold section or under
Being additionally provided with the cast gate for pouring into without lead bronze water on half module, this cast gate is connected with cast die cavity, and this cast gate has
Ingate and pouring basin, described ingate is correspondingly arranged at watering for molding faucet body spool installation portion
At note die cavity, start casting, during described casting, increase the amount of resin, cast temperature during described casting
Controlling between 1000 degree to 1010 degree, described ingate strengthens with pouring basin cross section, described
The accelerated solidification adding chill in contracting material position, loosing core during casting, and utilize running channel, cast gate to carry out feeding,
After having cast, proper extension open time, steadily place.
Improve further: the described water entering section of core profile, outlet part and spool installation portion chamber mould
Being provided with steam vent at dead angle, described steam vent is connected with die cavity, the pore that produces when can reduce casting and
Hole when being so that die sinking, product is unsightly.
Improve further: described two symmetrically arranged steam vents are the most rounded, and circular area is relatively
Greatly, easy to exhaust.
Improving further: described die cavity wall thickness all claims, smooth, inner chamber fillet is enough big, die cavity wall
Thickness all claims, smooth, and inner chamber fillet can prevent from the most greatly cracking during casting causing product grade the best.
Improve further: lead-free reflow water static a period of time of refine used during described casting,
Lead-free reflow water static a period of time of refine can allow gas evolution, effective minimizing bring because of pore
Problem.Described
Improve further: during described casting, slow down flow, reduce casting rate, often skim, subtract
Unhurried current amount, reduces casting rate, and often skimming, can to avoid scooping pyrite water be to bring slag into, it is possible to the most clear
Reason casting.
By using preceding solution, the invention has the beneficial effects as follows: during casting, increase the amount of resin,
During described casting, cast temperature controls between 1000 degree to 1010 degree, and ingate is transversal with pouring basin
Face is strengthened, the accelerated solidification adding chill in contracting material position, loosing core during casting, and utilizes running channel, cast gate to enter
Row feeding, product can be greatly reduced by these techniques and occur misruning, pore is many, cinder hole is many, contracting material,
The problems such as crackle, are provided with aerofluxus at the water entering section of core profile, outlet part and mould dead angle, spool installation portion chamber
Hole, described steam vent is connected with die cavity, the pore that produces when can reduce casting and have when being so that die sinking
Hole, product is unsightly.
Detailed description of the invention
With reference to claims, the present embodiment discloses the preparation method of a kind of lead-free reflow tap, Yi Zhongwu
The preparation method of ledrite tap, including the step that lead-free reflow liquid passes through gravity casting device moulding by casting
Suddenly, described gravity casting device includes upper mold section, female die and core, between upper mold section and female die
It is respectively equipped with the die cavity of the profile mated with faucet body, the die cavity between described upper mold section and female die
Inside it is provided with in core, the profile of described core and faucet body water entering section, outlet part and spool installation portion
The casting mating shapes in chamber, is formed chamber mould by the water entering section of core profile, outlet part and spool installation portion,
The cast gate for pouring into, this cast gate and cast die cavity phase it is additionally provided with without lead bronze water on described upper mold section or female die
Even, this cast gate has ingate and pouring basin, and described ingate is correspondingly arranged at for molding faucet body
At the cast die cavity of spool installation portion, start casting, during described casting, increase the amount of resin, described
During casting, cast temperature controls between 1000 degree to 1010 degree, and described ingate is transversal with pouring basin
Face is strengthened, the accelerated solidification adding chill in contracting material position, loosing core during described casting, and utilize running channel,
Cast gate carries out feeding, after having cast, and proper extension open time, steadily place, described core
Be provided with steam vent at the water entering section of profile, outlet part and mould dead angle, spool installation portion chamber, described steam vent with
Die cavity is connected, and described two symmetrically arranged steam vents are the most rounded, and described die cavity wall thickness all claims,
Smooth, lead-free reflow water static a period of time of refine used during the biggest described casting of inner chamber fillet, institute
Slow down flow when stating casting, reduce casting rate, often skim.
By using preceding solution, the invention has the beneficial effects as follows: during casting, increase the amount of resin,
During described casting, cast temperature controls between 1000 degree to 1010 degree, and ingate is transversal with pouring basin
Face is strengthened, the accelerated solidification adding chill in contracting material position, loosing core during casting, and utilizes running channel, cast gate to enter
Row feeding, product can be greatly reduced by these techniques and occur misruning, pore is many, cinder hole is many, contracting material,
The problems such as crackle, are provided with aerofluxus at the water entering section of core profile, outlet part and mould dead angle, spool installation portion chamber
Hole, described steam vent is connected with die cavity, the pore that produces when can reduce casting and have when being so that die sinking
Hole, product is unsightly.
The water entering section of preparation method core profile, outlet part and the spool installation portion of a kind of lead-free reflow tap
Being provided with steam vent at mould dead angle, chamber, described steam vent is connected with die cavity, the gas produced when can reduce casting
Hole and hole when being so that die sinking, unsightly, described two symmetrically arranged steam vents are respectively in circle for product
Shape, circular area is relatively big, easy to exhaust, and die cavity wall thickness all claims, smooth, and inner chamber fillet is enough big, mould
Cavity wall thickness all claims, smooth, and inner chamber fillet can prevent from the most greatly cracking during casting causing product grade the best,
Lead-free reflow water static a period of time of refine used during casting, static one section of the lead-free reflow water of refine
Time can allow gas evolution, effectively reduces the problem brought because of pore, slows down flow during casting, fall
Low casting rate, often skims, and slows down flow, reduces casting rate, often skims and can avoid scooping pyrite
Water is to bring slag into, it is possible to often clear up casting.
Described above, only utilize the embodiment of this origination techniques content, any those skilled in the art
Use modification, change that this creation done, all belong to the scope of the claims that this creation is advocated, and be not limited to implement
Example those disclosed herein.
Claims (5)
1. a preparation method for lead-free reflow tap, passes through gravity casting device including by lead-free reflow liquid
The step of moulding by casting, described gravity casting device includes upper mold section, female die and core, upper mold section
With the die cavity being respectively equipped with the profile mated with faucet body between female die, described upper mold section and lower half
Be provided with core in die cavity between mould, the profile of described core and faucet body water entering section, outlet part and
The casting mating shapes of spool installation portion inner chamber, is pacified by the water entering section of core profile, outlet part and spool
Formation chamber, dress portion mould, described upper mold section or female die are additionally provided with the cast gate for pouring into without lead bronze water, and this waters
Mouth is connected with cast die cavity, and this cast gate has ingate and pouring basin, and described ingate is correspondingly arranged at use
At the cast die cavity of molding faucet body spool installation portion, start casting, during described casting, increase tree
The amount of fat, during described casting, cast temperature controls between 1000 degree to 1010 degree, described in water
Mouthful strengthen with pouring basin cross section, the accelerated solidification adding chill in contracting material position, loosing core during described casting,
And utilize running channel, cast gate to carry out feeding, and after having cast, proper extension open time, steadily place.
The casting technique of lead-free reflow the most according to claim 1 tap, it is characterised in that: institute
It is provided with steam vent at the water entering section of core profile, outlet part and the mould dead angle, spool installation portion chamber stated, described
Steam vent is connected with die cavity.
The casting technique of lead-free reflow the most according to claim 2 tap, it is characterised in that: institute
State two symmetrically arranged steam vents the most rounded.
4. according to the casting technique of the lead-free reflow tap described in claim 1 or 2 or 3, its feature
It is: described die cavity wall thickness all claims.
The casting technique of lead-free reflow the most according to claim 1 tap, it is characterised in that: institute
Slow down flow when stating casting, reduce casting rate, often skim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610504899.XA CN105964911A (en) | 2016-06-30 | 2016-06-30 | Method for preparing unleaded brass tap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610504899.XA CN105964911A (en) | 2016-06-30 | 2016-06-30 | Method for preparing unleaded brass tap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105964911A true CN105964911A (en) | 2016-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610504899.XA Pending CN105964911A (en) | 2016-06-30 | 2016-06-30 | Method for preparing unleaded brass tap |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003184882A (en) * | 2001-12-13 | 2003-07-03 | Pooraito Kk | Oil-impregnated sintered bearing material |
| CN102179475A (en) * | 2011-05-13 | 2011-09-14 | 中宇建材集团有限公司 | Novel gravity casting pouring device suitable for lead-free brass |
| CN202155479U (en) * | 2011-05-13 | 2012-03-07 | 中宇建材集团有限公司 | Novel gravity casting pouring device applicable to lead-free brass |
| CN104057031A (en) * | 2014-06-17 | 2014-09-24 | 泉州安科卫浴有限公司 | Gravity casting process of lead-free brass tap |
| CN104259393A (en) * | 2014-10-09 | 2015-01-07 | 广东伟祥卫浴实业有限公司 | Casting technology for lead-free brass tap |
-
2016
- 2016-06-30 CN CN201610504899.XA patent/CN105964911A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003184882A (en) * | 2001-12-13 | 2003-07-03 | Pooraito Kk | Oil-impregnated sintered bearing material |
| CN102179475A (en) * | 2011-05-13 | 2011-09-14 | 中宇建材集团有限公司 | Novel gravity casting pouring device suitable for lead-free brass |
| CN202155479U (en) * | 2011-05-13 | 2012-03-07 | 中宇建材集团有限公司 | Novel gravity casting pouring device applicable to lead-free brass |
| CN104057031A (en) * | 2014-06-17 | 2014-09-24 | 泉州安科卫浴有限公司 | Gravity casting process of lead-free brass tap |
| CN104259393A (en) * | 2014-10-09 | 2015-01-07 | 广东伟祥卫浴实业有限公司 | Casting technology for lead-free brass tap |
Non-Patent Citations (1)
| Title |
|---|
| 杜西灵，杜磊: "《铸工实用手册》", 29 February 2012, 机械工业出版社 * |
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Application publication date: 20160928 |