1、 AMSC FSC 2530 Comments, suggestions, or questions on this document should be addressed to: DLA Land and Maritime, Attn: VAI, P.O. Box 3990, Columbus, OH 43218-3990, or emailed to FluidFlowdla.mil. Since contact information can change, you may want to verify the currency of this address information
2、using the ASSIST Online database at https:/assist.daps.dla.mil. MIL-DTL-14055F SUPERSEDING 17 August 2011 MIL-C-14055E 2 March 1982 DETAIL SPECIFICATION CUP, HYDRAULIC BRAKE ACTUATING CYLINDER: SYNTHETIC RUBBER This specification is approved for use by all Departments and Agencies of the Department
3、of Defense. 1. SCOPE 1.1 Scope. This specification covers molded cups, 2 inches in diameter and under, compounded from high temperature resistant rubber for use in hydraulic actuating cylinders employing hydraulic brake fluid of non-mineral oil type. 2. APPLICABLE DOCUMENTS 2.1 General. The document
4、s listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this lis
5、t, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handb
6、ooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARD FED-STD-791 - Lubricants, Liquid Fuels, and related Products; Methods of Testing INCH-POUND Inactive for new d
7、esign after 22 January 1999. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-14055F 2 DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-46176 - Brake Fluid, Silicone, Automotive, All Weather, Operational and Preservative (Copies of these documents
8、 are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unles
9、s otherwise specified, the issues of these documents are those cited in the solicitation or contract. ASTM INTERNATIONAL ASTM A336/A336M - Steel, Forgings, Alloy, for Pressure and High-Temperature Parts ASTM A624/A624M - Tin Mill Products, Electrolytic Tim Plate, Single Reduced ASTM B36/B36M - Brass
10、 Plate, Sheet, Strip and Rolled Bar ASTM B152/B152M - Copper, Sheet, Strip, Plate, and Rolled Bar ASTM B209 - Aluminum and Aluminum-Alloy Sheet and Plate (METRIC) ASTM D91 - Oils, Lubricating, Precipitation Number of ASTM D573 - Rubber-Deterioration in an Oven ASTM D2240 - Rubber Property-Durometer
11、Hardness (Copies of these documents are available online at http:/www.astm.org or from the ASTM International, P.O. Box C700, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) ISO 17025 General requirements for the competence of testing an
12、d calibration laboratories (Copies of these documents are available online at http:/www.iso.ch or from the International Organization for Standardization American National Standards Institute, 11 West 42nd Street, 13th Floor, New York, NY 10036.) NCSL INTERNATIONAL NCSL Z540.3 Requirements for the C
13、alibration of Measuring and Test Equipment (Copies of these documents are available online at http:/www.ncsli.org or from NCSL International 2995 Wilderness Place, Suite 107 Boulder, Colorado 80301-5404) SAE INTERNATIONAL SAE J431 - Automotive Gray Iron Castings SAE J527 - Brazed Double Wall Low Car
14、bon Steel Tubing (Copies of these documents are available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 of these documents (outside USA), www.sae.org.) 2.4 Order of precedence. Unless otherwise noted herein or in
15、the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Provided by IHSNot for
16、ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-14055F 3 3. REQUIREMENTS 3.1 Qualification. Cylinder cups furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applicable Qualified Products List (QPL)
17、 before contract award (see 4.4 and 6.3). 3.2 Used, rebuilt or remanufactured components. No used, rebuilt or remanufactured components, pieces, or parts, shall be used on the cylinder cups. 3.3 Materials. The materials used in the cylinder cups shall be a compound using a copolymer product of butad
18、iene and styrene (SBR) or ethylene propylene rubber (EPDM) as the basic material. The quality of the ingredients used in an approved compound shall be so controlled as to insure uniformity of performance of the cylinder cups. 3.3.1 Reference critical interface, materials, and processes. The material
19、s and processes identified in this specification are intended to assure mechanical compatibility, eliminate problems of contamination of critical hydraulic fluids and hydraulic brake systems. Manufacturers of wheel cylinder cups, master cylinder primary cups, and master cylinder secondary cups suppl
20、ied to this specification may use alternate industry recognized standards for materials and processes, provided prior approval is granted by the qualifying activity. The use of such alternatives shall not result in inferior short term or long-term performance or reliability. 3.3.2 Recycled, recovere
21、d, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3
22、.4 Physical Properties. 3.4.1 Durometer hardness (Shore A). 3.4.1.1 Durometer hardness for qualification. When tested as specified in 4.7.2 for qualification, the durometer hardness of the cups shall be within the limits of 55 to 75 points. 3.4.1.2 Durometer hardness for conformance. When tested as
23、specified in 4.7.2 for conformance, the durometer hardness of the cups shall be equal to the qualified value 5 points, providing it is within the limits of 55 to 75 points. The qualified value is the durometer hardness value obtained on a particular size and compound of cup at the time of qualificat
24、ion testing. The same value is thereby established for the other sizes of cups of that same compound for which qualification has been established. 3.4.2 Accelerated aging. After cylinder cups have been subjected to the accelerated aging test specified in 4.7.3, the change in durometer hardness (see
25、3.4.1) shall be within the limits of -5 to +5 points. 3.4.3 Low temperature. 3.4.3.1 Bendability. When subjected to the bend test specified in 4.7.4.1, the cup shall not crack and shall return to its approximate original shape within 1 minute. 3.4.3.2 Fluid leakage. When cups are tested as specified
26、 in 4.7.4.2, there shall be no leakage of fluid during the test. 3.4.4 Resistance to fluids at elevated temperature. After cylinder cups have been tested as specified in 4.7.5, changes in physical properties shall be within the limits shown in table I. Provided by IHSNot for ResaleNo reproduction or
27、 networking permitted without license from IHS-,-,-MIL-DTL-14055F 4 TABLE I. Change in physical properties. Physical properties Change Volume +5 to +20 percent Outside diameter (lip) 0 to +5.75 percent Outside diameter (base) 0 to +5.75 percent Durometer hardness 0 to -15 points 3.4.5 Heat-pressure
28、stroking. When tested as specified in 4.7.6, the cylinder cups shall conform to the following requirements. 3.4.5.1 Volume loss. The volume loss of brake fluid due to leakage past the secondary cup of the master cylinder or past the wheel cylinder cups during any 24,000-stroke period in the test, sh
29、all not exceed 3.5 milliliters or 10 milliliters for the 70,000-stroke period. (see 4.7.6.3) 3.4.5.2 Pressure change. The pressure in the simulated brake system shall not vary more than 50 psi (3.45 bars) from the initial stroking pressure throughout the 70 - hour test period. (see 4.7.6.3) 3.4.5.3
30、Leakage. After the 24-hour cooling period specified in the test, the following shall be cause for rejection (see 4.7.6.3): 1. Constant dampness past the cups on two or more inspections due to leakage. 2. Fluid discoloration of the filter paper on two or more inspections due to leakage. 3.4.5.4 Lip d
31、iameter interference. After test, the minimum lip diameter of the cups shall be greater than the cylinder bore by the minimum dimensions shown in table II. This dimensional quality of a cup is known as its lip diameter interference. (see 4.7.6.3) TABLE II. Lip diameter interference. 1/ 2/ Cup Size (
32、diameter) Wheel Cylinder Cup Master and Slave Cylinder Cup To 1 in. (2.54cm) 0.030 in. min. (0.0762cm) 0.020 in. min. (0.0508cm) 1 to 1.5 in. (2.54 to 3.81cm) 0.035 in. min. (0.0889cm) 0.025 in. min. (0.0635cm) 1.5 to 2 in. (3.81 to 5.08cm) 0.040 in. min. (0.1016cm) 0.030 in. min. (0.0762cm) 1/ Dime
33、nsions are in inches. 2/ Metric equivalents are given for information only. 3.4.5.5 Appearance of rubber cups. At the completion of the test, the cylinder cups shall show no more than a moderate amount of shipping, scuffing, blistering, cracking, tackiness, or change in shape from original appearanc
34、e. (see 4.7.6.3) 3.4.5.6 Hardness. Rubber cups shall not decrease in hardness by more than 15 points. (see 4.7.6.3) 3.4.5.7 Corrosion. Pistons and cylinder bore shall not show corrosion as evidenced by pitting to an extent discernible to the naked eye. (see 4.7.6.3) 3.4.5.8 Sedimentation. Not more t
35、han 1.5 percent sediment by volume shall be in the centrifuge tube after the fluid from the stroking test has been tested as specified in 4.7.6.3. The sedimentation shall show no crystalline particles. (see 4.7.6.3) 3.4.6 Corrosiveness. When the cylinder cups have been tested for corrosiveness as sp
36、ecified in 4.7.7, the test results shall be as follows. 3.4.6.1 Metal strips. The metal strips shall not be pitted nor etched. (see 4.7.7.3) The permissible loss in weight of the strips shall be as specified in table III. Provided by IHSNot for ResaleNo reproduction or networking permitted without l
37、icense from IHS-,-,-MIL-DTL-14055F 5 TABLE III. Loss in weight. Loss in Weight mg/sq cm, Max. Metal Tinned iron 0.2 Steel 0.2 Aluminum alloy 0.1 Cast iron 0.2 Brass 0.4 Copper 0.4 3.4.6.2 Disintegration of rubber cup. The rubber cup exposed to the brake fluid-water mixture shall show no sloughing, t
38、ackiness, blisters, nor any other form of disintegration. (Sloughing is indicated by the presence of carbon black on the surface of the rubber cup.) The base diameter of the cup shall not increase more than 0.050 inch (1.3 mm). The hardness of the rubber shall not decrease more than 15 points. (see
39、4.7.7.3) 3.4.6.3 Fluid. Following the corrosiveness test, the test fluid shall show no jelling or crystalline deposit, and shall contain not more than 0.05 percent (by volume) precipitated matter. (see 4.7.7.3) 3.4.7 Storage corrosion. When cylinder cups are tested as specified in 4.7.8 there shall
40、be no evidence of corrosion adhering to or penetrating the wall of the test cylinder bore which was in contact with the test cup. Slight discoloration (staining) or corrosion away from the contact surface of the test cups shall not be cause for rejection. 3.5 Identification. The part or identificati
41、on number (PIN) shall be marked on the package and shall include the PIN, the manufacturers name or CAGE code, and date code. The identification mark of the manufacturer and other marking as specified on applicable drawings (see 6.2) shall be molded into each cylinder cup. 3.6 Workmanship. Wheel cyl
42、inder cups, master cylinder primary cups, and master cylinder secondary cups shall be processed in such a manner as to be uniform in quality and shall be free from burrs, crazing, cracks, voids, pimples, chips, blisters, pinholes, protuberances, embedded foreign matter and other physical defects tha
43、t will adversely affect life, serviceability, or appearance. 4. VERIFICATION 4.1 Classification of inspection. The inspection requirements specified herein are classified as follows: a. Qualification inspection (see 4.4). b. Conformance inspection (see 4.5). 4.2 Test equipment and inspection facilit
44、ies. Test and measuring equipment and inspection facilities of sufficient accuracy, quality and quantity to permit performance of the required inspection shall be used. The establishment and the maintenance of a calibration system to control the accuracy of all test and measuring equipment shall be
45、in accordance with ISO 17025 and NCSL Z540.3, as applicable. 4.3 Inspection conditions. Unless otherwise specified, all testing shall be conducted at atmospheric pressure within the range of 28 to 31 inches of mercury (71.1 to 78.4 centimeters of mercury), a temperature between 60F and 100F (15.6C t
46、o 37.8C), and a relative humidity of not more than 90%. Tolerances of the test conditions shall be as follows: a. Temperature: +10F, -5F (+5.55C, -2.8C) b. Pressure (gauge): 5% Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-14055F 6 4.3.1 St
47、abilization of test temperatures. Unless otherwise specified, the test temperature in the chamber shall be stabilized before conducting the test. 4.3.2 Test fluidsMIL-PRF-46176. . Unless otherwise specified, the test fluid shall be brake fluid in accordance with 4.4 Qualification inspection (see 6.3
48、). Qualification inspection shall be performed at a laboratory acceptable to the qualifying activity on sample units produced with equipment and procedures used in production. 4.4.1 Samples for qualification inspection. Samples for qualification inspection shall be representative of the products pro
49、posed to be furnished to this specification. 4.4.2 Inspection routine. The samples shall be subjected to the inspections specified in table IV in the order shown. TABLE IV. Quality certification inspection. Requirement Requirement paragraph Test method paragraph Qualification Conformance (Group A) Periodic (Group B) Accelerated aging 3.4.2 4.7.3 Bendability 3.4.3.1 4.7.4.1 Fluid leak 3.4.3.2 4.7.4.2 Resistance to f
