| A young couple got married and left on their honeymoon. When they got back, the bride immediately called her mother. "Well, how was the honeymoon?" asked the mother. "Oh mamma!" she exclaimed. "The honeymoon was wonderful! So romantic!" N... Read more of The honeymoon is over at Free Jokes.ca |  InformationalPrivacy |
Steel MakingThe Care Of Carburizing CompoundsOf all the opportunities for practicing economy in the heat-t... Heat Treatment Of Axles Parts of this general type should be heat-treated to show the... Hardening High-speed Steels We will now take up the matter of hardening high-speed steels... Complete Calibration Of Pyrometers For the complete calibration of a thermo-couple of unknown e... Composition Of Transmission-gear Steel If the nickel content of this steel is eliminated, and the pe... Heavy Forging Practice In heavy forging practice where the metal is being worked at... Application To The Automotive Industry The information given on the various parts of the Liberty eng... Nickel-chromium A combination of the characteristics of nickel and the charac... Heat-treating Equipment And Methods For Mass Production The heat-treating department of the Brown-Lipe-Chapin Company... Carbon Steels For Different Tools All users of tool steels should carefully study the different... Piston Pin The piston pin on an aviation engine must possess maximum res... Hardness Testing The word hardness is used to express various properties of me... Impact Tests Impact tests are of considerable importance as an indication ... Lathe And Planer Tools FORGING.--Gently warm the steel to remove any chill, is parti... For Milling Cutters And Formed Tools FORGING.--Forge as before.--ANNEALING.--Place the steel in a ... Annealing Of High-speed Steel For annealing high-speed steel, some makers recommend using g... Corrosion This steel like any other steel when distorted by cold worki... Crankshaft The crankshaft was the most highly stressed part of the entir... Heat Treatment Of Punches And Dies Shears Taps Etc HEATING.--The degree to which tools of the above classes shou... Gas Consumption For Carburizing Although the advantages offered by the gas-fired furnace for ... |
Testing And Inspection Of Heat TreatmentCategory: HEAT TREATMENT OF STEEL The hard parts of the gear must be so hard that a new mill file does not bite in the least. Having passed this file test at several points, the gears go to the center-punch test. The inspector is equipped with a wooden trough secured to the top of the bench to support the gear, a number of center punches (made of 3/4-in. hex-steel having points sharpened to an angle of 120 deg.) and a hammer weighing about 4 oz. With these simple tools, supplemented by his skill, the inspector can feel the depth and quality of the case and the condition of the core. The gears are each tested in this way at several points on the teeth and elsewhere, the scrap gear being also subjected to the test. Finally, the scrap gear is securely clamped in the straightening press shown in Fig. 57. With a 3-1/2-lb. hammer and a suitable hollow-ended drift manipulated by one of Sandow's understudies, teeth are broken out of the scrap gear at various points. These give a record confirming the center-punch tests, which, if the angle of the center punch is kept at 120 deg. and the weight of the hammer and blow are uniform, is very accurate. After passing the center-punch test the ends of the teeth are peened lightly with a hammer. If they are too hard, small particles fly off. Such gears are drawn in oil at a temperature of from 300 to 350 deg.F., depending on their hardness. Some builders prefer to have the extreme outer ends of the teeth drawn somewhat lower than the rest. This drawing is done on gas-heated red-hot plates, as shown at A in Fig. 58. Nickel steel, in addition to all the tests given to carbon steel, is subjected to a Brinell test. For each steel, the temperature and the period of treatment are specific. For some unknown reason, apparently like material with like treatment will, in isolated cases, not produce like results. It then remains for the treatment to be repeated or modified, but the results obtained during inspection form a valuable aid to the metallurgist in determining further treatment. Next: Temperature Recording And Regulation Previous: Affinity Of Nickel Steel For Carbon
Viewed 946 |
||||||||||||||||||||
