Precision Investment Castings

We are the leading manufacturers of metal castings, metal investment castings and metal precision castings, etc. Investment Casting is the most preferred casting method for a wide array of Industrial components. The advantages of using the process for manufacturing are:

Sajjan Precision Castings has improvised its focus towards producing zero-defect products. All our products conform to various Indian and international standards. Besides, the company has ISO 9001:2000 certification for implementing Total Quality Management in its business operations. The in-house Quality Assurance and Control (QA&C) department test each products several times on different quality parameters before the delivery. For testing, we have following facilities:

Chemical Laboratory :
Well equipped laboratory with spectrometer for analyzing all chemical elements.

Physical Testing Laboratory :
Equipped with universal tensile testing machine and impact testing machine to measure Brinell, Rockwell and Vickers hardness.

Standards Room :
Air-conditioned standards room equipped with digital height, slip gauges and vernier calipers for dimensional checking of machined and unmachined castings as well as tools.

Non-Destructive Testing :
Facilities for magnetic particle inspection and liquid penetrant inspection, together with well developed recognized ancillary facilities for Radiography.

Investment casting process is used in different industries for producing intricately detailed and near net shape castings. We utilize latest software and sophisticated machineries to design and manufacture best quality of cast components. With our years of experience and in-depth knowledge, we have been successfully catering to the needs of the diverse industries including:

SURFACE FINISH
As-cast finishes will vary with alloy specified but generally fall within the range quoted. For a ground finish an allowance of 0.010 in. (0.25mm) should be made.

GENERAL TOLERANCES
Shape and alloy selected will influence accuracies achieved but values given are normally accepted through out the investment casting industry.

STRAIGHTNESS
There are practical limits to straightness which can be achieved but mechanical straightning can reduce variations.

FLATNESS
Flatness is also affected by dimensions of casting. Addition of ribs will minimize bowing, twisting and distortion and mechanical straightning will reduce variations where necessary.

CAST HOLES
Depth (D) and Diameter(d) of hole must allow for adequate penetration of investment material. Values given show usual limits for cast holes but pre-formed ceramic cores allow this restrictions tobe exceeded, although usually at increased cost.

CONCENTRICITY
The larger the outside diameter becomes, the closer to concentric an inside diameter can be cast. Mechanical correction can normally be made where wall thickness is thin enough to allow plastic deformation.

ROUNDNESS
For solid bars roundness is affected by solidification stresses and tolerance required increases nearly in proportion to diameter, inline with usual 'Lost Wax' tolerances. Values shown are for as-cost roundness on inside and outside diameters of tubes of varying sizes. Wall thickness is important and tighten tolerance can be obtained by mechanical correction if desired.

MINIMUM SECTION THICKNESS
Wall thickness will depend upon area of casting and alloy selected. The following values are of guide from general experience.

PARALLEL SECTIONS
Parallelism can be maintain by adding fire-bars to minimize distorsions. Values shown are typical tolerances for various gap-widths between parallel sections per inch cost.

OTHER FEATURES :
- Angles : Angular tolerance to ±1/2° (Closer by mechanical corrections).
Symbols : Latters, Numbers, etc., can be reproduce in relief or inset.
Serrations, Splines and Gear Teeth may be cast in certain instances subject to prior agreement.