CN107234212A - It is suitable for the preparation method of the porous sand base of non-model sand mold foundry engieering - Google Patents
It is suitable for the preparation method of the porous sand base of non-model sand mold foundry engieering Download PDFInfo
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- CN107234212A CN107234212A CN201710424057.8A CN201710424057A CN107234212A CN 107234212 A CN107234212 A CN 107234212A CN 201710424057 A CN201710424057 A CN 201710424057A CN 107234212 A CN107234212 A CN 107234212A
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- Prior art keywords
- sand
- base
- mold
- sand base
- porous
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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
- B22C9/10—Cores; Manufacture or installation of cores
Abstract
The invention provides a kind of preparation method for the porous sand base for being suitable for non-model sand mold foundry engieering, it comprises the following steps：Step one, sand processed prepares, the roughing sand of the mesh number needed for being obtained after roughing sand is sieved；Step 2, with interval 35mm to 70mm arranging density hole is drilled until die cavity internal run-through in the drill bit of the mold base external application respective diameters prepared；Die cavity is inserted in step 3, the hole that the air orifice needle in the range of diameter of phi 1mm to Φ 8mm is drilled from step 2, and is reliably fixed；Step 4, pours into hybrid resin sand in mold base, extracts air orifice needle from outer out in sand lump semi-solid preparation.The present invention, which has, can prepare the sand base of the diversified forms such as bulk-solid items sand base and annular hollow sand base, pore size is uniform, it is controllable to be distributed, stomata is not influenceed by wall thickness, structure, the drilling of sand base is once completed with the shaping of sand base, improving production efficiency and drilling are independent of artificial operation, the characteristics of reduction produces intensity.
Description
Technical field
The present invention relates to a kind of preparation method of porous sand base, in particular it relates to which one kind is suitable for non-model sand mold casting skill
The preparation method of the porous sand base of art.
Background technology
Casting is one of the main method for obtaining engineering goods blank, be also modern mechanical manufacturing industry fundamental technology it
One, it is existing manufacturing important component.Wherein, sand casting is as traditional casting technique, with abundant raw materials,
Simple production process, using alloy species it is extensive the features such as, about 70% casting is all obtained by this method in the world at present.And sand
The preparation of type and core is an important component in sand casting production, and the quality of sand mold/core quality is directly affected
Physical dimension, surface quality and the metallurgical performance of final casting.Traditional sand mold/core casting mainly uses wood pattern molding, first
Pattern manufacturing must first be come out, carry out sandbox founding to manufacture sand mold/core further according to apperance, finally cast obtains casting.
The manufacture of its sand mold/core relies on apperance or core box, and cost is high, and the cycle is long, it is difficult to meet the quick system of single and mini-batch production part
Make and trial production of new products, and its dimensional accuracy and surface quality are also all difficult to meet the weight such as modern aerospace, national defence and automobile
The requirement of the crucial casting of point industry.
In recent years, developing rapidly with Computerized Numerical Control processing technology, domestic also widely available application, except to conventional metals
Outside the processing of part, the industrially developed country such as current Germany, U.S. by NC milling technology directly apply to sand mold/
The manufacture of core, it need not make wooden model, apperance etc., with the manufacturing cycle is short, cost is low, sand mold/core integration manufacture and
The advantages of arbitrarily complicated shape casting can be produced, the sand mold/core dimensional accuracy prepared in particular by this method is brought up to
CT6-7 grades, surface roughness reaches 3.2-6.3um (micron), and the overall near-net-shape of intricate casting can be achieved, single-piece,
There is more preferable development prospect in terms of the manufacture of small lot intricate casting and the trial-production of new product.At present, the industrial country such as America and Europe
The trial production technology given priority to has been classified as, has been a major transformation to traditional sand casting technology, especially exists
The field cast shape structures such as current modern aerospace, defence and military and automobile show integration, thin-walled property and complexity
Under the trend of change, development sand mold/core NC milling technology will have broader practice prospect and engineering application value.
At present, the sand base applied to NC milling is most of or directly continues to use original traditional sand mold/core
Preparation method, the sand base preparation method that the characteristics of minority is directed to sand mold/core NC milling is developed is also due to resin contains
Amount height causes gas forming amount big, and gas can not discharge and can not be applied to defect and be inclined to higher light-alloy casting field.And show
The thinking studied both at home and abroad in the Milling Process technology of non-model sand mold/core is mostly centered around optimization sand base resin, curing agent and matched somebody with somebody
Side and the expansion in terms of brill stomata on the sand mold machined, these aspects are to obtain low gas forming amount molding sand and molding sand exhaust
Important means.But in fact, being limited by bit performance, drill bit can not accomplish not only thin but also long, still can not solve large scale, heavy wall
The exhausting problem of molding sand；And stomata dependence manual operations is bored, labor intensity is big, and quality stability is not high, often because workman's power
Spend control problem and make the molding sand of high collapsibility that overall collapse occur in boring procedure.The present invention is applied to without sand from research
Angle prepared by the Special multi-hole sand base of type/core foundry engieering is set out, and is changed thinking, before molding sand digital control processing, is passed through
Change the manufacturing process of sand base, the exhaust attribute for making sand base have automatically after molding sand is machined, and pore size uniform, point
Cloth rule is controllable, so as to improve non-model sand mold/core foundry engieering application feasibility.
The content of the invention
For defect of the prior art, non-model sand mold casting is suitable for the technical problem to be solved in the present invention is to provide one kind
The preparation method of the porous sand base of technology is made, it, which can have, can prepare a variety of shapes such as bulk-solid items sand base and annular hollow sand base
The sand base of formula, pore size is uniform, it is controllable to be distributed, and stomata is not influenceed by wall thickness, structure, and the drilling of sand base shapes once with sand base
Complete, improving production efficiency and drilling are independent of artificial operation, and the characteristics of reduction produces intensity is imitated with good exhaust
Really, so as to lift casting quality.
There is provided a kind of preparation side for the porous sand base for being suitable for non-model sand mold foundry engieering according to an aspect of the present invention
Method, it comprises the following steps：
Step one, sand processed prepares, the roughing sand of the mesh number needed for being obtained after roughing sand is sieved；
Step 2, is drilled in the drill bit of the mold base external application respective diameters prepared with interval 35mm to 70mm arranging density
Hole is until die cavity internal run-through；
Die cavity is inserted in step 3, the hole that the air orifice needle in the range of diameter of phi 1mm to Φ 8mm is drilled from step 2,
And reliably fix；
Step 4, above-mentioned roughing sand and a certain proportion of resin, curing agent are mixed with ratio, stirred, so
After pour into mold base, and sand base is made using mechanical pressurization shaping or vacuum and mechanical pressurization；
Step 5, extracts above-mentioned air orifice needle between sand lump hardening time is 1/3 to 2/3 one by one outside mold base；
Step 6, treats that opening mold base is fully cured in sand lump；
Step 7, the sand base of solidification is put into drying baker and carries out drying and processing, and first temperature rises to 175-200 DEG C, guarantor
After warm 45-60min, then it is warming up to 650-700 DEG C, constant temperature 15min, furnace cooling, so as to obtain being applied to non-model sand mold casting
The porous sand base of technology.
Preferably, the porous sand base is divided into bulk-solid items sand base or annular hollow sand base.
Preferably, the bulk-solid items sand base is used along the two dimension one-dimensional, along two direction of principal axis of single direction of principal axis or edge
The three-dimensional drilling of three direction of principal axis；Annular hollow sand base uses axial direction drilling or radial direction drilling.
Compared with prior art, the present invention has following beneficial effect：The porous sand base prepared can be applied to solid
The sand base of the diversified forms such as block sand base and annular hollow sand base；Pore size is uniform, it is controllable to be distributed；Stomata is not by wall thickness, knot
The influence of structure；The drilling of sand base is once completed with the shaping of sand base, improving production efficiency；Drilling is independent of artificial operation, reduction production
Intensity；The present invention is suitable for casting sand type/core that non-model sand mold foundry engieering is used, be particularly suitable for it is complicated, have
Sand mold/core of the special constructions such as heavy wall, in the high-end of the equipment configurations such as Aero-Space, weaponry, automobile and ship complexity
Field shows great advantage.Preparation method of the present invention is easy；Be particularly suitable for large scale, thick-walled structure porous sand mold/
Core.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
The preparation method that the present invention is suitable for the porous sand base of non-model sand mold foundry engieering comprises the following steps：
Step one, sand processed prepares, the roughing sand of the mesh number needed for being obtained after roughing sand is sieved；
Step 2, is drilled in the drill bit of the mold base external application respective diameters prepared with interval 35mm to 70mm arranging density
Hole is until die cavity internal run-through；
Die cavity is inserted in step 3, the hole that the air orifice needle in the range of diameter of phi 1mm to Φ 8mm is drilled from step 2,
And reliably fix；
Step 4, above-mentioned roughing sand and a certain proportion of resin, curing agent are mixed with ratio, stirred, so
After pour into mold base, and sand base is made using mechanical pressurization shaping or vacuum and mechanical pressurization；
Step 5, extracts above-mentioned air orifice needle between sand lump hardening time is 1/3 to 2/3 one by one outside mold base；
Step 6, treats that opening mold base is fully cured in sand lump；
Step 7, the sand base of solidification is put into drying baker and carries out drying and processing, and first temperature rises to 175-200 DEG C, guarantor
After warm 45-60min, then it is warming up to 650-700 DEG C, constant temperature 15min, furnace cooling, so as to obtain being applied to non-model sand mold casting
The porous sand base of technology.
The porous sand base is divided into bulk-solid items sand base or annular hollow sand base, and such pore size is uniform, it is controllable to be distributed.
Bulk-solid items sand base use along single direction of principal axis it is one-dimensional, along the two dimension of two direction of principal axis or along three direction of principal axis
Three-dimensional drilling；Annular hollow sand base uses axial direction drilling or radial direction drilling, such sand base drilling and sand base into
Shape is once completed, improving production efficiency；Drilling is independent of artificial operation, reduction production intensity.
The operation principle of the present invention is as follows：Preset diameters scope is the method for Φ 1mm to Φ 8mm air tubes in mold base,
The sand base of various states is cofree to realize drilling direction one-dimensional, two-dimentional, three-dimensional, axially and radially, so as to realize that arrangement is close
The porous sand base spent in 35mm to uniform, controllable between 70mm manufactures method, and uniform air vent aperture and arranging density can ensure casting
Part and the molding sand smooth gas discharge in casting process, so as to ensure casting security lifting casting quality；Drying is put into after die sinking
Drying and processing is carried out in case, first temperature is risen to after 175-200 DEG C, insulation 45-60min, then is warming up to 650-700 DEG C, constant temperature
15min, furnace cooling finally gives the porous sand base suitable for non-model sand mold foundry engieering.
In summary, the present invention is prepared from research suitable for the Special multi-hole sand base of non-model sand mold/core foundry engieering
Angle is set out, and changes thinking, before molding sand digital control processing, by changing the manufacturing process of sand base, sand base is processed in molding sand
After the completion of the exhaust attribute that has automatically, and pore size is uniform, and the regularity of distribution is controllable, solves tradition and is produced in sand base and completes
Drill that stomata can not be applied to large scale, heavy wall sand base and labor intensity are big, quality stability is not high is easily destroyed sand by hand afterwards
The defects such as base surface quality, so as to improve a kind of feasible effective method of non-model sand mold/core foundry engieering application feasibility.
Embodiment 1
First, sand processed prepares, and the roughing sand of 70-140 mesh numbers is obtained after roughing sand is sieved；
2nd, the bulk-solid items mold base external application Φ 4mm prepared drill bit 50mm intervals arranging density respectively along X-axis side
Hole is drilled to, Y direction and Z-direction until die cavity internal run-through；
3rd, diameter 4mm air orifice needle is inserted into die cavity from the above-mentioned hole drilled, and reliably fixed；
4th, by above-mentioned roughing sand with 2% resin, curing agent mixed with ratio, stir, be subsequently poured into mould
Base, and using mechanical pressurization shaping；
5th, above-mentioned air orifice needle is extracted one by one outside mold base at sand lump hardening time 1/2；
6th, treat that opening mold base is fully cured in sand lump；
7th, the sand base of solidification is put into drying baker and carries out drying and processing, first temperature rises to 200 DEG C, be incubated 55min
Afterwards, then it is warming up to 680 DEG C (degree Celsius), constant temperature 15min (divides), furnace cooling, so as to obtain being applied to non-model sand mold casting skill
The porous sand base of art.
Embodiment 2
First, sand processed prepares, and the roughing sand of 70-140 mesh numbers is obtained after roughing sand is sieved；
2nd, the arranging density at annular hollow mold base external application Φ (diameter) 3mm prepared drill bit 35mm intervals is distinguished
Hole is drilled both axially and radially until the plug insertion of die cavity center；
3rd, diameter 1mm (millimeter) air orifice needle is inserted into die cavity from the above-mentioned hole drilled, and reliably fixed；
4th, resin, the curing agent of above-mentioned roughing sand and 2% (percentage sign) are mixed with ratio, stirred, then
Mold base is poured into, and sand base is made using vacuum and mechanical pressurization；
5th, above-mentioned air orifice needle is extracted one by one outside mold base at sand lump hardening time 2/3；
6th, treat that opening mold base is fully cured in sand lump；
7th, the sand base of solidification is put into drying baker and carries out drying and processing, first temperature rises to 175 DEG C, be incubated 45min
Afterwards, 650 DEG C are warming up to then, constant temperature 15min, furnace cooling, so as to obtain the porous sand base suitable for non-model sand mold foundry engieering.
Embodiment 3
First, sand processed prepares, and the roughing sand of 70-140 mesh numbers is obtained after roughing sand is sieved；
2nd, the bulk-solid items mold base external application Φ 5mm prepared drill bit 70mm intervals arranging density respectively along X-axis side
Hole is drilled to, Y direction and Z-direction until die cavity internal run-through；
3rd, diameter 8mm air orifice needle is inserted into die cavity from the above-mentioned hole drilled, and reliably fixed；
4th, by above-mentioned roughing sand with 2% resin, curing agent mixed with ratio, stir, be subsequently poured into mould
Base, and using mechanical pressurization shaping；
5th, above-mentioned air orifice needle is extracted one by one outside mold base at sand lump hardening time 1/3；
6th, treat that opening mold base is fully cured in sand lump；
7th, the sand base of solidification is put into drying baker and carries out drying and processing, first temperature rises to 190 DEG C, be incubated 60min
Afterwards, then it is warming up to 700 DEG C (degree Celsius), constant temperature 15min (divides), furnace cooling, so as to obtain being applied to non-model sand mold casting skill
The porous sand base of art.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (3)
1. a kind of preparation method for the porous sand base for being suitable for non-model sand mold foundry engieering, it is characterised in that comprise the following steps：
Step one, sand processed prepares, the roughing sand of the mesh number needed for being obtained after roughing sand is sieved；
Step 2, with interval 35mm to 70mm arranging density Kong Zhi is drilled in the drill bit of the mold base external application respective diameters prepared
To die cavity internal run-through；
Die cavity is inserted in step 3, the hole that the air orifice needle in the range of diameter of phi 1mm to Φ 8mm is drilled from step 2, and it is solid
It is fixed；
Step 4, above-mentioned roughing sand and a certain proportion of resin, curing agent are mixed with ratio, stirs, then falls
Enter mold base, and sand base is made using mechanical pressurization shaping or vacuum and mechanical pressurization；
Step 5, extracts above-mentioned air orifice needle between sand lump hardening time is 1/3 to 2/3 one by one outside mold base；
Step 6, treats that opening mold base is fully cured in sand lump；
Step 7, the sand base of solidification is put into drying baker and carries out drying and processing, and first temperature rises to 175-200 DEG C, is incubated 45-
After 60min, then it is warming up to 650-700 DEG C, constant temperature 15min, furnace cooling, so as to obtain suitable for non-model sand mold foundry engieering
Porous sand base.
2. the preparation method of the porous sand base according to claim 1 for being suitable for non-model sand mold foundry engieering, its feature exists
In the porous sand base is divided into bulk-solid items sand base or annular hollow sand base.
3. the preparation method of the porous sand base according to claim 2 for being suitable for non-model sand mold foundry engieering, its feature exists
In, the bulk-solid items sand base use along single direction of principal axis it is one-dimensional, along the two dimension of two direction of principal axis or along three direction of principal axis
Three-dimensional drilling；Annular hollow sand base uses axial direction drilling or radial direction drilling.
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| CN201710424057.8A CN107234212A (en) | 2017-06-07 | 2017-06-07 | It is suitable for the preparation method of the porous sand base of non-model sand mold foundry engieering |
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| CN201710424057.8A CN107234212A (en) | 2017-06-07 | 2017-06-07 | It is suitable for the preparation method of the porous sand base of non-model sand mold foundry engieering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115625290A (en) * | 2022-11-04 | 2023-01-20 | 南京航空航天大学 | Method and device for efficiently refrigerating multi-path internal micropores of frozen sand mold |
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| CA2314428C (en) * | 1999-07-28 | 2006-04-11 | Ronald Gustafson | Method for machining sand block into sand molding elements including sand molds and sand cores for metal casting foundry operations |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2314428C (en) * | 1999-07-28 | 2006-04-11 | Ronald Gustafson | Method for machining sand block into sand molding elements including sand molds and sand cores for metal casting foundry operations |
| JP2002224793A (en) * | 2001-02-02 | 2002-08-13 | Ota Chuzosho:Kk | Method for manufacturing casting |
| US20040238144A1 (en) * | 2001-09-27 | 2004-12-02 | Bertram Hentschel | Method for milling casting moulds |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115625290A (en) * | 2022-11-04 | 2023-01-20 | 南京航空航天大学 | Method and device for efficiently refrigerating multi-path internal micropores of frozen sand mold |
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