Terms of delivery:
1. Definition and scope
1.1Investmentcastingisa process by which a high surface quality can be manufacturedthroughtheformation of dimensionally accurate casting.The patternsproducedbyinjection
moulding are heat disposable and are meltedoutaftermanufacture of the ceramic moulds. The ceramic mouldsaredestroyed aftercasting. For this reason, both the pattern andthemoulds are designatedlost
using this method. Castingusually takesplace into hot moulds.
1.2 Metals and nickel-based alloys can be used for investment casting.
1.3Thistechnicalmemorandumdoes not apply precious metals cast using thedewaxingmethod,to productsof the jewellery industry,dentallaboratories or toart casting.
2. Purpose
2.1Thistechnicalmemorandumdefines dimensional tolerances, specifies machiningallowancesand surfaceroughness corresponding to the startof the art inthe fieldof investmentcasting. It serves
as a basis for optimumeconomiccooperation betweeninvestment casting suppliers and buyers.
2.2Thespecificationsmentionedhererefer to sandblasted preserved or pickledsurfaces in theirdeliveredcondition. Exception must be agreedwherework processes areinvolved
which alter the dimensional tolerances.
2.3Unlessotherwiseagreed,initial samples are supplied for first-timeorders.These are usedtopermit concrete mutual agreement betweensupplier andpurchaser.Initialsamples must be
appraised by thebuyer,followed by awritten release tothe foundry for seriesproduction.Deviationacknowledged bythe releaseor with positiveappraisal of theinitialsamples are binding for theproduction
processand must beentered intothe(casting) drawing.
3. Dimensional accuracy
3.1 Contraction and shrinkage
Duringthesolidification andcooling of cast metals, a contraction ofthevolumenaturally occurs as aresult of shrinkage. Otherfactorsinfluencing the production of instrument
castingscan resultfromtheshrinkage of the lost pattern and the expansion ofmouldsduringheating. The sum of these influencing factors istakenintoconsideration in the shrinkage
allowance during themanufactureofinjection moulds. The shrinkage allowance isbased onexperiencevalues,depending on the contour of the casting, the ceramicshell andthe castingmaterials, as well as
the casting techniques usedin theindividualfoundries.
3.2 Reference planes and reference points
Drawingusedin themanufacture of casting must be gauged systematicallyusingreference orlocating points in order to ensure that dimensionalchecksand subsequentmachining are in agreement. Reference
points mustbedetermined right fromthe early design stage and coordinatedbetweenthezero position of thereference planes is precisely defined bymeans ofthe reference pointdimensions. All
reference points must bearranged insuch a way that theyare not removed or altered during thesubsequentmachining process.Reference points should be positioned onthe outsidesurfaces of theinvestment
casting.They may take the form ofraised orreference pointsare beneficial when dealing with castingswithrestricted shape andposition tolerances. When determining thereferencepoints, attentionshould
be paid to ensuring that they do notfall inthe area of asprue. In case of complex shaping,it is possible inthisway to positionthe casting precisely by(pre-)machining thelocatingpoints.
3.3 Over definition
According to DIN 406, overde finition must be avoided. Wall thicknesses must always be specified.
3.4 Mould and draught angles
Mould and draught angles are not necessary as a general
rule.Exceptionstothisfor reason of mould making or casting necessity must beagreedbetween theinvestment casting supplier and the buyer.
4. Dimensional tolerances
4.1 Linear dimensional tolerances
Achievable dimensional tolerances on investment casting are dependent on the following factors:
Casting material
Dimensions and shape of the casting
Validity of the accuracy grade
4.1.2. Dimensions and shape of the casting
Theachievableaccuracy levelof the rated dimensions of an investmentcasting dependson the greatestdimension and the shape of thecasting.If the rateddimension(GTA)exceeds the rated dimension
rangeindicated for acertainaccuracy level,the overall tolerance of thecasting must be tolerancedat the accuracylevel (greatest tolerancefield). Deviation outside theaccuracy levelmust be agreed
between thesupplier and thebuyer.
Note: The technical infomation above are incomplete. Please contact us for more details.
Our Precision Investment Casting Technology has been applied in theproduction of:
A high standard of surface quality
Low material allowance on surfacesto be machined
Facility for complex shaped innercontours due to the use of ceramic cores
A high degree of dimensional accuracy due to elimination of the mould parting line usually responsible forcasting imprecision
Hardly any restrictions in terms ofmaterials
Almost unlimited scope for theshaping of castings
The investment casting technique is characterized by
Summary
Generallyspeaking,theinvestment castingtechnique is used for small pieceweights ofbetween 1gand 10 kg. Largerwork-pieces up to 150 kg are alsopossible.
Piece weights
Thecastingare producedwithout any trace of flash, and with an excellentsurfacefinish.In manycases-expect for producing the required seatdimensionsthere isno needfor a follow-on machining process.
Surface quality
All castable materials canbe processed using this method. Investmentcasting isparticularly suitableforuse with materials unsuited tomachining.
Material selection
Full service manufacturing of investment castings, including machining,heat treating, passivation, plating, polishing,and painting.
We offer stainless steel, carbon steel or alloy steel casting made by investment casting according to customer's design.
Coupling
Coupling
Material:316
Surface: Electro-polishing,machined
Delivery Time: | Samples within 20-25 days, mass production within 30-35 day. |
Package: | Cartons and plywood cases, or according to customer's requirements. |
Supply Ability: | 10000 Piece/Pieces per Month |
Minimum Order Quantity: | 400 Piece/Pieces Negotiable |
Payment Terms: | L/C,T/T |
Port: | Guangzhou Huangpu |
Brand Name: | OEM offered |
Place of Origin: | Guangdong China (Mainland) |
Large Hose Coupling-Flange Large hose fittings include several kinds of couplings. Large Hose Coupling-Multi Lug Size: 4\', 6\', 8\', 10\', 12\'. Material: aluminum. And features of large hose coupling-multi lug. Large Hose Coupling-Storz Segment clamps are clamps with special ...
Come From SUZHOU SEAPEAK CO., LTD
Coupling Sleeve is a sleeve-shaped rock drilling component with internal threads for connecting shank adapter and drill rod, or drill rod and drill rod. We produce and provide three types of drill rod couplings – semi bridge couplings, full bridge couplings, and crossover ...
Come From Litian Heavy Industry Machinery Co., Ltd
\"China offer Variable speed hydraulic coupling YOTCGP875 for turbine generator Sold by YOYIK. Deyang YOYIK is a professional production, development, sale of power plant dedicated spare parts and accessories processing company. Through more than 21 years of efforts, the ...
\"China Supplier Variable speed hydraulic coupling YOTCGP700 for steam turbine It is YOYIK special sale. Deyang YOYIK power spare parts service is committed to thermal power plants, hydropower station spare parts production and supply. Long-term for the power plant to provide a ...
Introduction of Brass Camlock Fittings Brass camlock fittings or known brass camlock coupling are made of brass casting with premium quality and can resist corrosion as well as prevent mating threads from seizing. Brass camlock fittings is assembled with brass arms, steel ...
Come From SUZHOU SEAPEAK CO., LTD
Bauer couplings provide a quick and easy way to join many lengths of hose together. They are commonly used for the pumping and transfer of water in the construction, road maintenance and general irrigation industries. They can also be used for loading and unload road tankers ...
Come From SUZHOU SEAPEAK CO., LTD
Bauer Coupling Reducer We can produce them in two different sizes in one coupling. Bauer couplings are specialty ball and socket connections, designed primarily for use in irrigation, dewatering and other agricultural applications. This style of fitting is widely available in ...
Come From SUZHOU SEAPEAK CO., LTD
The Use of Aluminum Hose Fittings Our Camlock couplings are used to connect hoses etc. The cam-lock coupling, in general, has 8 types including 4 types male parts and 4 types female parts. When you insert male part into female part and close the cam-lock levers, Free leakage ...
Come From SUZHOU SEAPEAK CO., LTD
Advantages Class I Division 1,Group A,B,C,D Zone 1, Zone 2 Class II Division 1,Group E,F,G Zone 21, Zone 22 Class III Type 4X,IP66 Ex d IIC Gb Max. M63x1.5 or NPT2\" Ex tb IIIC Db IP66 SFC series explosion proof flexible coupling, known as explosion proof flexible pipe, class ...
Come From SUREALL TECHNOLOGY LIMITED
Silane coupling agent, also known as silane treatment agent and primer, is a kind of low molecular organic silicon compound with special structure. The speciality of silane coupling agent lies in the two types of reactive groups with different chemical properties contained in ...