swing check valve of steel casting

Swing check valve of steel casting 1 Material:SS 304 or 316 2 Process : lost wax process 3 Surface : mirror polish

Swing check valve of steel casting

Specification

1,  investment casting ,precision casting

2,  carbon steel / alloy steel /stainless steel

3,  SDM/OEM

4,  FIMA , AP,QP,QA,QC,AOL,RD

The ultimate success of casting design deponds on the communications between the designer and foundry engineers .When the foundry is properly informed of part requirement .there is usually a compromise of sepcification that will allow for maximum compliance to print specification and finish part design .

1,Standard linear Tolerance (mm)

As-cast tolerances of angles is mainly a founction of the part design ,and their ocation is casting they range from +/-1/2 degree (considered minimum ) for well supported position to +/-1/2degree where existing distortion could be expected .Inclusion of gussets and ribs normally minimizes distortion and many section can be mechanically straighted

2,Size And Weight Range

Size and weight part size and weight are the most critical factors in determining part cost because mold capacity is limited by both size and weight .The most pieces that can run on a mold ,the lower the part of cost .Unnecessary mass should always be removed by correct engineering practices to raduce part weight

Items	Size	Premium
Outline Dimention	1000*620*380	up to 100
weight kgs	0.001-60	0.10 to  1.5
Min.Wall Thickness	0.5	5 to 10

3,Surface roughness

80 to 120 RMS are average

4,Hole length

Making a good hole in a casting is dependent on the intergrity of the shell .The ratio of hole diameter to length is important in determining what can be offered .Blind holes must have aradius at the top and the bottom of the hole insure that a strong core is built for casting purpose and to insure the best possible casting

5,  When possible ,part should be designed so that a single gate can feed the part ,this will generally yiled more pieces per mold and reduce the pour weight per mold

1)      Break-off witness (same alloys)

2)      0.2-0.50mm high witness

3)      Flush grind

6,  Heat treatment

Heat treat are used to control hardness ,mechanical properties ,corrosion resistance ,and surface treatment .unless otherwise indicated ,all alloy steels are quoted with a normalize or anneal All 300 series stainless steel an 17-4PH are quoted with a solution anneal

7,Gaging

We proform a 100% visual inspection ,however ,if dimensional vertifications requireed ,a sample plan and process control is less expensive to use than gages with dial indicators (important :whenever custom gaged are used ,there should be identical gaged at WOTECH and at the customer’s plant )

9,Non –destructive Testing

All sample investment casting are non-destructively tested in order to establish first article quality .However ,this is generally not required on production commercial investment casting ; Doing so well add cost ,the following non-destructive tests are listed from least to greatest cost :

1)      Magnetive particle

2)      Fluid penetrant

3)      X-Ray

10,Tooling & Cavities

If the design contains features that will raise scrap or rework rates (and the piece price ).The WOTECH Estimating Engineer will recommand design modifications keep the piece price down .

More cavities means higher tooling cost ,but lower piece Configutations that do not allow metal cores to be drawn must be treated in one of the following ways :

1)      Collapsible Cores – Lowest piece price ,higher tooling cost

2)      Loose inserts –Best for low volume parts

3)      Mutipiece wax Assemblies –Best for certain configurations ,but tolerance control suffers

4)      Soluble Cores :Requires additional die and labor

5)      Pre-Formed ceramic core—High cost for specialized shapes

11,Alloy Grade

Alloys are listed from least to greatest cost

1)      Carbon and low Alloy steels 8620,4140,1020,1035,are best choices.

2)      17-4PH and 400 series stainless steel

17-4PH & CA-15 410 are most frequently poured

Do not specify 416 unless necessary for machinability

3)      300 series stainless steel

4)      Tool steels costs vary widly depending on grade.

swing check valve of steel casting