1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 10 09 Revised Updated 2001 04 11 Revised Updated Wolfgang Janssen 1989 02 01 SM/ER3161TC Released N.Riley Printed copies are uncontrolled Page 1 of 3 Copyright 2002, Ford Global Technologies, Inc. CAST
2、IRON - CHROMIUM ALLOY, CHILLED CAMSHAFT WSD-M1A305-A1 1. SCOPE The material defined by this specification is a chromium alloy cast iron suitable for mechanically chilled components. 2. APPLICATION This specification was released originally for material used for camshafts employing a distributor/oil
3、pump skew drive gear produced by mechanically chilling cams in a shell mold or green sand casting process. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part produce
4、rs must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION (Weight Percent) Carbon 3.1 3.9 Silicon 2.6 max Manganese 0.6 0.9 Phosphorus 0.2 max Sulphur 0.15 max Chromium 0.5 1.1 Molybdenum 0.8 max Nickel 0.25 max Copper 1.0 max Compositi
5、on shall be selected generally from within the above range in order to meet microstructural, chill depth, chill distribution, machinability and strength requirements. Specific composition limits and foundry practice to meet performance and manufacturing requirements will form part of an agreed Contr
6、ol Plan for each component. ENGINEERING MATERIAL SPECIFICATION WSD-M1A305-A1 Page 2 of 3 Copyright 2002, Ford Global Technologies, Inc. 3.3 MECHANICAL PROPERTIES 3.3.1 Ultimate Tensile Strength (ASTM E 8M/ISO 6892) Standard Test Bar, min, MPa 260 or Diabolo Test Bar, min, MPa 275 (DIN 50109) Tensile
7、 strength should be determined on separately cast test bar. Where practical, test bars machined from components should also exceed the minimum limits. If the component UTS is considered a requirement, the tensile strength and test bar location shall be specified on the Engineering drawing. 3.3.2 Har
8、dness (unless otherwise stated on the Engineering drawing) (ASTM E 10/ISO 6506; ASTM E 18/ISO R 80) Finished Camshaft Only (surface) Cams and Eccentrics HRC 45 min* Bearing Journals HB 229 min Distributor, Oil Pump Gears, etc. HB 229-310 Note: Correction factors for surface curvature are applicable
9、on the above HRC values. *Applicable to all chill areas designated on Engineering drawing. For large volume survey on castings, bearing hardness may be taken 0.5 mm above the finished diameter. 3.4 MICROSTRUCTURE (Finished Camshaft) 3.4.1 Cam (see WSD-M99A4-A for carbide assessment). The cam contact
10、 surface (within designated chill zone) shall consist of 30 % min (by area) acicular carbide, measured at 200 X magnification, and fine pearlite. Graphite up to a level of 5 % (by area) in a fine interdendritic form shall be permitted. 3.4.2 Eccentric A similar microstructure to that described above
11、, for cam contact surface, shall be present at the complete contact surface periphery. ENGINEERING MATERIAL SPECIFICATION WSD-M1A305-A1 Page 3 of 3 Copyright 2002, Ford Global Technologies, Inc. 3.4.3 Distributor, Oil Pump Skew Gears The structure shall be Form VII flake graphite predominantly type
12、A, size 4 (ASTM A 247) in a matrix of fine pearlite with some carbide networks. The carbide form shall be essentially continuous or near continuous network with a 0.8 mm max mesh size and total carbide level of 5% min. Dispersed acicular carbide shall be permitted. 3.4.4 Bearings The bearings surfac
13、e structure shall be Form VII flake graphite predominantly type A, size 4 (ASTM A 247) in a matrix of fine lamellar pearlite with some carbide forms. Dependent upon acceptable machinability, carbide volumes and forms are not critical. 3.5 CLEANLINESS Finished components shall be free of loose sand, oxide and scale.
