1、MIL-P-18324D 93 D 999990b 0117241 9 MIL-P-18324D 21 NOVEMBER 1966 SUPERSEDING MIL-P-18324C 16 MAY 1962 (SEE 6.6) MILITARY SPECIFICATION PLASTIC MATERIAL, LAMINATED PHENOLIC, FOR BEARINGS (WATER OR GREASE LUBRICATION) This 8pecificatwn ia mandatory for we by al De partmenta ad Agencies of the Departm
2、ent of Defense. i. SCOPE PPP-B-591 - B ox e s , Fiberboard, 1.1 This spfscification covers laminated phenolic resin cotton fabric base material. The material is available in the form of sheets or ehapes. This specification is appli- cable only to sizes such that polished 1/2 inch cubes may be prepar
3、ed from the material. Wood-Cleated. Plywood. and Lock-Corner. PPP-B-601 - Boxes, Wood, Cleated- PPP-B-621 - Boxes, Wood, Nailed PPP-B-640 - B o x e s , Fiberboard, Corrugated, Triple- Requirements for other sizes should be as specified (see 6.2). Wall. 2. APPLICABLE DOCUMENTS STANDARDS 2.1 The follo
4、wing documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the extent specified herein. MIGSTD-105 - Sampling Procedures and Tables for In- SPECIFICATIONS spection by Attri- butes. MILITARY FEDERAL MIGSTD-129 - Marking for Shi p
5、 - QQ-N-286 - Nickel-Copper-Alumi- ment and Storage. u A o y DRAWINGS Wrought (K-Mon- el). MILITARY RR-S-366 - Sieves, Standard for 810-1385664 - Bearings, Stern Tube Testing Purposes. and Strut. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-
6、18324D 93 MILP-18324D $32200-921759 - Bearing, Laminated Phenolic Stave Type Rudder, Arrgts. and Stave. 82200-921760 - Bearing, Laminated Phenolic Stave Type Rudder, Table of Dimen- sions. U. S. NAVY MARINE ENGINEERING LABORATORY 12753 - Bench Wear Tester. (Copies of specifications, standards, drawi
7、ngs, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by tho contracting officer.) 22 Other publications. T h e following document forms a part of this specification to the extent specified herein.
8、Unless other- wise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. OFFICIAL CLASSIFICATION COMMITTEE Uniform Freight Classification Rules. (Application for copies should be addressed to the Official Classification Committee, 1 Park Avenue at 33rd St
9、reet, New York, N. Y. 10016.) 3. REQUIREMENTS 3.1 Qualification. The laminated thermo- setting plastic bearing furnished under this specification shall be products which are qualified for listing on the applicable quali- fied products list at the time set for opening of bids (see 4.2 and 6.3). 3.2 M
10、aterial. Bearing material shall be laminated phenolic thermosetting plastic, consisting of layers of woven cotton fabric thoroughly impregnated with thermosetting 999990b 01172c12 O resin, laminated and molded under controlled heat and pressure so that the resulting prod- uct will be dense and homog
11、eneous. 3.3 Dimensions of sheets (see 6.2). 3.3.1 Length and width. Unless otherwise specified in the contract or order or in de- tailed specifications, the manufacturers standard sizes between 23 and 50 inches in width and between 36 and 96 inches in length will be acceptable. The length and width
12、of sheets may vary 1 inch over or under the manufacturers standard size. Nonuniform standard sheet dimensions caused by cutting specimens for tests required by this specifica- tion shall not be cause for rejection, pro- vided the test specimens are cut from one corner and the material removed for te
13、st purposes is no larger than 12 by 12 inches square by the thickness of the price being sampled. 3.3.2 Thickness. Sheets shall be furnished in thicknesses as specified (see 6.2). Sheets or pieces cut or punched from sheets, shall be within the tolerances specified in table I. At least 90 percent of
14、 the area of the sheet shall be within the tolerances specified, and at no point shall the thickness vary from the nominal by a value greater than 125 percent of this specified tolerance. TABLE 1. Tolerances on thickness of sheets Nominal thickness Inches % ?4 % 1 1% Inch 0.053 .O68 .O62 O65 .O69 No
15、minal thickness Inches 3 3% 4 4% 5 Inch 0.130 .146 .163 .179 .190 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-L832UD 73 - TABLE I. Tolerances on thickness of sheets-Contd Nomind thickness Inches 1% 1% 1% 1% 1% 1% 2 2% 2 ?4 2% Toierance (P
16、lum only) Inch .O73 .O77 .O81 .O85 .O89 .O93 .O97 .lo5 .113 .121 Nominal thicknew Inches 6% 6 6% 7 7% 8 8% 9 9% 10 Tolerance (plus only) Inch .210 .230 .240 .260 .280 .290 .310 .320 540 ,360 Note 1. On sheeta of nominal thickness not listed above. the tolenince shall e the same aa specified for the
17、next greater thickness. Note 2. Where closer tolerances are reauired. the maximum and minimum thicknesses shall be as specified (see 6.2 ) . 3.4 Dimensions of tubes (see 6.2). 3.4.1 Length. Tubes may be furnished in manufacturers standard lengths. 3.4.2 Standard diumeters. The steps shown in table I
18、I shall be considered standard for inside and outside diameter sizes of round tubing. TABLE II. Nominal tubing skes .- - Nominal inside and outaide diameters Inches 1-1/16 to 3, inclusive 3-jg to 6, inclusive BY stew of Inch 1/16 % 999990b OLL72q3 2 9 MIL-P-18324D TABLE II. Nominal tubing sizes-Cont
19、d Nominal inside and outaide diameters BY steps of - - 6% to 8, inclusive % 8% to 36, inclusive 192 I 3.4.3 Tolerances, inside and outside diam- eters. Round tubing shall conform to the specified dimensions for nominal inside and outside diameters, within the tolerances specified in table III. TABLE
20、 III. Toleranees on tubing diameters Tolerance (plus or minus) Nominal diametem Inches 1-1/16 to 1-16/16, inclusive 2 to 4, inclusive 4% to 12, inclusive 12% to 18, inclusive 18% to 24, inclusive 24% to 36, indusive Inside diameter Inch 0.004 .O08 .o10 .O30 .O40 .o60 Outside diameter Inch 0.005 .O08
21、 .O25 .O30 .O35 .O40 3.5 Dimensions of other shapes. Dimen- sions and tolerances of other shapes shall be as specified (see 6.2). Typical stern tube strut and rudder bearing stave sizes and de- tails are shown on Drawings 810-1385664, 82206921759, and 8220 such as incomplete closures of case liners,
22、 con- tainer flaps, loose or inade- quate strappings, bulged or distorted containers. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILP-1832PD Examine Defect Count Less than specified or indicated quantity. Weight Gross or net weight exceeds spe
23、cified requirements. Markings Interior or exterior markinq (as applicable) omitted, illegible, incorrect, incomplete, or not in accordance with contract requirements. 4.4.1.4 Inspection levels ad acceptable qmlity levels (AQLs) for examination. The inspection levels for determining the sample size,
24、and the acceptable quality levels (AQLs) expressed in defects per 100 units, shall be as fol!ows: Cbu.cteristic Swelling Hardness As received After 120 hours boiling water) Compressive strength After 120 hours (boiling water) Examination paragraph Inapection levcl AQL 4.4.1.1 I 1.5 4.4.1.2 $2 2.5 4.
25、4.1.3 s-2 4.0 4.4.2 Quality conformance testing. Qual- ity conformance testing shall be conducted in accordance with table VI for the charac- teristics as indicated herein on each lot offer- ed for delivery. The sample unit shall con- sist of 10 inches square of the plastic mate- rial. The sample si
26、ze shall be two. There shall be no evidence of failure to meet the specified requirements. TABLE VI. Instruction for testing Swication reference muirement 3.6.1 3.6.2 3.6.2 3.63 Test method 4.7.1 4.7.2 4.7.2 4.7.3 Requirements ipplicable to individual unit X X X X Number determinations per unit Aver
27、age of 5 Averam of 20 Average of 20 Average of 6 Results reported as numerically to nearest 1 0.001 inch Rockwell hardness value Rockwell hardness value p.s.i. 1 Tt repork 8hll inchide di value# on which wults are ked. 4.5 Comparison inspection. Comparison tests in 4.2 and 4.7. Five copies of the co
28、m- parison inspection test reports shall be for- warded to the Naval Ship Engineering Cen- ter. If the tests are conducted at the manu- facturers plant, the Government inspector shall certify that the tests were conducted under his supervision and in accordance with inspection tests shall be conduct
29、ed under the supervision of the Government inspector at the manufacturers plant or at a laboratory satisfactory to the Naval Ship Engineering Center and shall consist of the same tests and procedures specified for the qualification 6 Provided by IHSNot for ResaleNo reproduction or networking permitt
30、ed without license from IHS-,-,-the test procedures specified in this specifica- tion. Action to maintain the approval of the material will be taken by the Naval Ship Engineering Center on the basis of the test results. If comparison inspection test re- sults are not received before the expiration o
31、f five years from the date of a qualification or prior comparison inspection approval, such approval will automatically be with- drawn, and the product removed from the Military Qualified Products List. 4.6 Preparation of test specimens. Speci- mens for use in hardness, swelling, -compres- sive stre
32、ngth and abrasive wear tests shall be selected and prepared as follows: MIL-P-18324D 4.6.1 Location of specimens, plate mate- *. Specimens shall be cut from sheets being procured from stock so as to remove no more than a 12 by 12 inch square from one corner. The two original edges of the sheet shall
33、 be identified and any cubes cut from the square within 4v2 inches of these origi- nal sheet edges shall be “edge” specimens. Specimens cut from the remainder of the square shall be “central” specimens. Each cube shall be numbered and its orientation, as cut from the original sheet, shall be main- t
34、ained throughout all finishing and testing procedures (see figure 1). FIGURE 1. Specimen sampling and orientation diagram. 4.6.2 Orientation of specimens. The orientation of the faces of all cubes is as follows (see figure 1) : (a) Face 1 - Surface of plate selected for the numbering of specimens. (
35、b) Face 2 - Opposite surface of plate. (c) Face 3 - Top side of cube. (d) Face 4 - Right side of cube. (e) Face 5 - Bottom side of cube. (f) Face 6 - Left side of cube. When looking at face 1. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-1
36、832VD 93 m 777790b OLL7248 L m MILP-18324D 4.6.3 Selection of specimens for test. The selection of the specimens for the individual tests shall be random from within the “edge” and “central” areas as listed in table VIL TABLE VII. Selection of specimens for test Test As received hardness Hardness an
37、d swelling af- ter 120 hours in boil- ing water Compressive strength af- ter 120 hours in boil- ing water Abrasive wear Na from “edge” Na from “central” 4.6.4 LocatZon of specimens, shapes or forms other than plate material, Specimens shall be cut from shaped or formed mate- rial so that the plane o
38、f laminations (or tangent thereto) is parallel to one face of each cube and that the sides of each cube are parallel to the two directions of the cloth weave. 4.6.5 Finishing of specimens. Specimens shall be finish machined to cubes approxi- mately 1-irch on an edge. If the material is not thick eno
39、ugh to provide 1-inch cubes, inch cubes may be used (except for abra- sive wear tests). All faces of the specimen shall be machined to remove the molded sur- faces. The machined surfaces shall be lapped on 1/0 and 3/0 emery cloth until all notice- able lint is removed. All machining and polishing op
40、erations shall be performed in such a manner as to prevent overheating of the specimens. 4.6.6 Specimen condition. “As received” specimens shall be tested at the temperature and humidity prevailing in the testing room at the time tests are made. Specimens im- mersed in boiling water for 120 hours sh
41、all be cooled to room temperature in a stream of running tap water for a minimum period of 1-hour, blotted to remove free surface moisture, and test begun within five minutes after removal from the tap water. The final water temperature shall be 75F. i 5F. During the boiling and tap water immersion
42、periods, care shall be taken to prevent any cube face from adhering to any other flat surface. The specimens shall be supported on screens above the bottom of the test cham- ber and be separated from each other by inch or more to provide for adequate circula- FIGURE 2. Wear test specimens. 8 Provide
43、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-tion of the water. Specimens for the abra- sive wear tests shall be conditioned for 24 hours at 210F. and then kept in a desicca- tor for a minimum of 2-hours or until re- moval for test. 4.6.7 Year test speci
44、mens. In addition to the preparational procedures specified in 4.4 through 4.6.6, the specimens selected for the abrasive wear tests shall be machined as in- dicated in figure 2. 4.6.7.1 Two inch wide by l/s inch deep saw kerfs shall be cut across the test face of each specimen (perpendicular to the
45、 plane of the laminations) spaced to provide a cen- tral “land” that shall be 0.440 inch wide k0.005 inch. 4.7 Methods of tests. 4.7.1 Swelling. Swelling shall be deter- mined by the difference in measurements of l-inch polished cubes, when adequate mate- rial thickness is available, prepared in ac-
46、 cordance with 4.6, before and after immer- sion in boiling water 212F. for 120 hours. In case the material is not sufficiently thick to provide l-inch cubes, inch cubes may be used. The results shall be expressed as swelling in inches per inch of original di- mension. Measurements shall be made wit
47、h an instrument to the nearest 0.001 inch. The - instrument shall be accurate to plus or minus 0.001 inch. Two measurements shall be made of each cube in the direction perpendicular to the plane of the laminations at the mid- points of two adjacent edges (from face 1 to face 2 across face 3 and acro
48、ss face 4 (see figure 1). The arithmetical average of the ten differential measurements shall be used to determine the swelling value. The swelling of each specimen representing the sample and the average value shall be re- ported. 4.7.2 Hardness. The Rockwell hardness values shall be determined by
49、using the M- scale, inch ball penetrator, minor load of 10 kilograms, and a major load of 100 kilo- MIL-P-18324D grams. Specimens prepared as specified in 4.6 shall be tested on edge or parallel to lamination. The machine shall be so ad- justed that the major load will be fully applied within 6 to 8 seconds. The major load shall be removed within 1 second after the crank handle mechanism has come to a stop. Care shall be taken that the test is not made
