CN107398530A - The V method casting techniques of the high valve body of precision - Google Patents
The V method casting techniques of the high valve body of precision Download PDFInfo
- Publication number
- CN107398530A CN107398530A CN201710611399.0A CN201710611399A CN107398530A CN 107398530 A CN107398530 A CN 107398530A CN 201710611399 A CN201710611399 A CN 201710611399A CN 107398530 A CN107398530 A CN 107398530A
- Authority
- CN
- China
- Prior art keywords
- sandbox
- valve body
- high valve
- template
- precision
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
-
- 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)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of V method casting techniques of the high valve body of precision, comprise the following steps：The ceramic slurry mixed up in advance is poured into sandbox；Upper surface is struck off, after gum deposit cools down 5 15min after grouting, molding when ceramic layer disappears flexible, first running gate system, venting pin is taken out during molding, then vertically takes out master mold.By the above-mentioned means, surface finish of casting produced by the invention and dimensional accuracy height, rate of metal are high.
Description
Technical field
The present invention relates to valve body processing technique field, more particularly to a kind of V method casting techniques of the high valve body of precision.
Background technology
V methods are cast and lost foam casting is also known as negative pressure casting, because taking English Vacuum（Vacuum）The prefix " V " of one word and
Gain the name.It is without using adhesive that it, which is different from traditional sand casting biggest advantage, and the casting of V methods is to utilize plastic sheeting sealing sandbox,
By air in vacuum-pumping system extraction type, there is pressure differential inside and outside casting mold, make dry sand closely knit, die cavity needed for formation, through lower core, conjunction
Case, cast vacuumize and make casting solidification, release negative pressure, and molding sand obtains casting therewith defeated and dispersed.But in the prior art, technological process
Design coarse, cause the sealing of V method casting molds and intensity undesirable.
The content of the invention
The present invention solves the technical problem of：The surface finish of casting and dimensional accuracy of production are high, metal utilizes
Rate is high.
In order to solve the above technical problems, one aspect of the present invention is：A kind of V methods of the high valve body of precision are provided
Casting technique, comprise the following steps：Manufacture carries exhaust chamber and aspirating hole template first, thin in the plastics of mecystasis by toasting
Film is covered in template, vavuum pump pumping makes film be closely attached in template to be molded, the sandbox with filtering suction pipe is placed on
Cover in the template of plastic sheeting, the drystone sand of no binding agent and additives filled into sandbox, made sand consolidation by means of microseism,
Strike off, put sealing film, open vavuum pump and pump air in sandbox, control the pressure in sandbox, then play core, mould assembling, pour
Note, the vacuum in removing template is solved, then carry out withdrawing pattern, casting mold will continue to vacuumize untill the casting solidification of cast.
In a preferred embodiment of the present invention, the temperature of the baking is 1000 DEG C -1150 DEG C.
In a preferred embodiment of the present invention, the temperature of the solidification is 50 DEG C.
In a preferred embodiment of the present invention, the pressure in the sandbox is 0.04-0.06MPa.
The beneficial effects of the invention are as follows：The surface finish of casting and dimensional accuracy of production are high, rate of metal is high.
Embodiment
It is described in detail with reference to presently preferred embodiments of the present invention, so that advantages and features of the invention can be more easy to
In being readily appreciated by one skilled in the art, apparent clearly defined so as to be made to protection scope of the present invention.
Embodiment one
A kind of V method casting techniques of the high valve body of precision, comprise the following steps：Manufacture carries exhaust chamber and aspirating hole template first,
To toast in the covered rearing with plastic film of mecystasis in template, vavuum pump pumping makes film be closely attached in template to be molded, by band
The sandbox for having filtering suction pipe is placed in the template for having covered plastic sheeting, and no binding agent and additives are filled into sandbox
Drystone sand, make sand consolidation by means of microseism, strike off, put sealing film, open vavuum pump and pump air in sandbox, control in sandbox
Pressure, then play core, mould assembling, cast, solve the vacuum in removing template, then carry out withdrawing pattern, casting mold will continue to vacuumize until pouring
Untill the casting solidification of note.
Further illustrate, the temperature of the baking is 1000 DEG C -1150 DEG C, and the temperature of the solidification is 50 DEG C, the sand
Pressure in case is 0.04-0.06MPa.
The design of vacuum-pumping system will prevent dust or fine sand from invading vavuum pump, because dust or fine sand enter vavuum pump
Afterwards, the abrasion of parts will be accelerated, shorten the life-span of parts, or even influence the performance of vavuum pump.To set water in this system
Air filtration tank is bathed, residual air enters vavuum pump after water-bath air filtration tank further purification, and dust content is less than 0.5mg/m3, passes through vacuum
Pump is discharged into air.The selection of vavuum pump is divided into vavuum pump and is divided to two kinds of dry type and wet type, and dry vacuum pump can obtain vacuum height,
But complicated easy break-down, especially inconvenient maintenance, rate of air sucked in required are low.Wet vacuum pump vacuum is not high, but rate of air sucked in required is big, makes
With it is reliable, fault rate is low.During V method moulding, it is not necessary to too high vacuum, typically in the range of -0.04~-0.06MPa i.e.
Can, general wet vacuum pump can meet that vacuum required during V method moulding, especially its rate of air sucked in required are adapted to greatly the need of V method moulding
Will, the relation between rate of air sucked in required and vacuum is should be noted that typically from water-ring vacuum pump, during selection.It is, in general, that formed
Vacuum is bigger, and rate of air sucked in required is just smaller.The rate of air sucked in required of vavuum pump can be according to sandbox size while the sandbox vacuumized number, casting
When film burn lose caused by air leakage in addition to sandbox of air leakage and vacuum system determine.The packing density of molding sand has to casting
Very big influence, in order to improve the compression strength of molding sand and hardness, it is necessary to improve packing density, need to be shaken in back-up sand for this
It is dynamic.In addition vibration is also helped because natural packing angle influences, the filling of some not readily accessible local locations in back-up sand, when thin
When film is locally put up a bridge or gauffer is perpendicular to back-up sand direction, it can also influence sand and fill up thereunder, after decompression is molded, this flatung
Bilayer film will be pulled open to its packless direction, make mo(U)ld face formed open state.It can also be made when the degree of packing is inadequate
Increase the danger of wall thickness because of buckle into casting, can also increase the fash of die joint.So carrying out necessary vibration during back-up sand, make
It is very important that the original big dry sand of mobility, which obtains enough degree of packing, and the major parameter for influenceing the degree of packing is exciting force
Size and Orientation, locally put up a bridge at part transverse direction convex-concave position and film perpendicular to back-up sand direction or fold place, only by vertical
Nogata to unidirectional exciting force tend not to the requirement for meeting partial stowage and the degree of packing, ideally to molding sand apply three-dimensional shake
It is dynamic to make it be in random Three-dimensional Flow, optimal filling and compacting effect are realized, improves filling and consolidation efficiency.For shape
Casting of the shape simply without laterally concavo-convex position, can use common plain bumper；But it is more complicated to work as casting, there is lateral aperture or transverse direction
During bumps change, preferably with three-dimensional vibrating-compaction table, it can meet the moulding of the different vibration mode of various casting and exciting force
It is required that being effectively prevented from sand fills bad and raising filling consolidation efficiency.
Present invention is disclosed a kind of V method casting techniques of the high valve body of precision, surface finish of casting and the size essence of production
Degree is high, rate of metal is high.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright description is made, or directly or indirectly it is used in other related technology necks
Domain, it is included within the scope of the present invention.
Claims (4)
- A kind of 1. V method casting techniques of the high valve body of precision, it is characterised in that：Comprise the following steps：Manufacture carries exhaust chamber first With aspirating hole template, will toast in mecystasis covered rearing with plastic film in template, vavuum pump pumping film is closely attached to mould It is molded on plate, the sandbox with filtering suction pipe is placed in the template for having covered plastic sheeting, is filled into sandbox without viscous The drystone sand of agent and additives is tied, makes sand consolidation by means of microseism, strikes off, puts sealing film, opening vavuum pump is pumped in sandbox Air, the pressure in sandbox is controlled, then play core, mould assembling, cast, the vacuum in solution removing template, then carry out withdrawing pattern, casting mold will be after It is continuous to vacuumize untill the casting solidification of cast.
- 2. the V method casting techniques of the high valve body of precision according to claim 1, it is characterised in that：The temperature of the baking is 1000℃-1150℃。
- 3. the V method casting techniques of the high valve body of precision according to claim 1, it is characterised in that：The temperature of the solidification is 50℃。
- 4. the V method casting techniques of the high valve body of precision according to claim 1, it is characterised in that：Pressure in the sandbox For 0.04-0.06MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710611399.0A CN107398530A (en) | 2017-07-25 | 2017-07-25 | The V method casting techniques of the high valve body of precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710611399.0A CN107398530A (en) | 2017-07-25 | 2017-07-25 | The V method casting techniques of the high valve body of precision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107398530A true CN107398530A (en) | 2017-11-28 |
Family
ID=60402124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710611399.0A Pending CN107398530A (en) | 2017-07-25 | 2017-07-25 | The V method casting techniques of the high valve body of precision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107398530A (en) |
Citations (8)
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|---|---|---|---|---|
| CN101693282A (en) * | 2009-10-22 | 2010-04-14 | 南阳市汇森精密仪器铸造有限公司 | Method for producing voltage-bearing aluminum alloy tank body of ultra-high voltage switch by V-process |
| CN101722298A (en) * | 2009-11-12 | 2010-06-09 | 薛立华 | Vacuum sealed molding casting method production process for front bridge and rear bridge of automobile |
| CN102554122A (en) * | 2012-01-29 | 2012-07-11 | 姜玉飞 | Novel modeling method for casting large-sized and ultra large-sized alloy steel track shoes |
| CN103056311A (en) * | 2013-01-31 | 2013-04-24 | 宁夏众信机械设备制造有限公司 | Process for shaping furnace outlet nozzle of calcium carbide smelting furnace by using V method |
| CN103071763A (en) * | 2013-01-31 | 2013-05-01 | 宁夏众信机械设备制造有限公司 | Dry-sand negative pressure casting method of calcium carbide smelting caldron and calcium carbide smelting caldron |
| CN104325075A (en) * | 2014-10-08 | 2015-02-04 | 柳州金茂机械有限公司 | V method casting process |
| CN104550848A (en) * | 2013-10-24 | 2015-04-29 | 青岛和德隆机械有限公司 | V-method vacuum casting technology |
| CN104923731A (en) * | 2015-06-11 | 2015-09-23 | 柳州金特新型耐磨材料股份有限公司 | V-process production method |
-
2017
- 2017-07-25 CN CN201710611399.0A patent/CN107398530A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101693282A (en) * | 2009-10-22 | 2010-04-14 | 南阳市汇森精密仪器铸造有限公司 | Method for producing voltage-bearing aluminum alloy tank body of ultra-high voltage switch by V-process |
| CN101722298A (en) * | 2009-11-12 | 2010-06-09 | 薛立华 | Vacuum sealed molding casting method production process for front bridge and rear bridge of automobile |
| CN102554122A (en) * | 2012-01-29 | 2012-07-11 | 姜玉飞 | Novel modeling method for casting large-sized and ultra large-sized alloy steel track shoes |
| CN103056311A (en) * | 2013-01-31 | 2013-04-24 | 宁夏众信机械设备制造有限公司 | Process for shaping furnace outlet nozzle of calcium carbide smelting furnace by using V method |
| CN103071763A (en) * | 2013-01-31 | 2013-05-01 | 宁夏众信机械设备制造有限公司 | Dry-sand negative pressure casting method of calcium carbide smelting caldron and calcium carbide smelting caldron |
| CN104550848A (en) * | 2013-10-24 | 2015-04-29 | 青岛和德隆机械有限公司 | V-method vacuum casting technology |
| CN104325075A (en) * | 2014-10-08 | 2015-02-04 | 柳州金茂机械有限公司 | V method casting process |
| CN104923731A (en) * | 2015-06-11 | 2015-09-23 | 柳州金特新型耐磨材料股份有限公司 | V-process production method |
Non-Patent Citations (1)
| Title |
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| 邓宏运等3: "《消失模铸造及实型铸造技术手册》", 31 January 2013, 机械工业出版社 * |
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Application publication date: 20171128 |