Quam solvere problema de griseo ferrum castings, qui non durum

The hardness of gray iron castings is directly related to the grade, such as the user unit requires the material to be HT200 material gray iron castings, in the casting according to the material grade accurate batching, the casting hardness should meet the HT200 material casting hardness requirements 163-255HBS, the test results are qualified within the standard floating range, if the casting hardness meets the material requirements, but can not meet the use requirements can be used to the Superficies mittentes ad portare ex Nitriding curatio aut extinguantur curatio et aliis processibus solvere problema satis duritiem.

Commune solutiones cani ferrum castings non durum satis:

I. Flammam extinguere (idoneam pro uno pieces vel magna workpieces, qui opus ad augendam loci duritia)

Uti pistoria gun (cum oxygeni plus acetylene) ad calefacere superficiem temperatus de griseo ferrum casting workpiece ad 900-1000 ° C, tunc cito refrigerare cisternina frigida. De extinguitur altitudinem circiter 2-6 mm et duritiam circa 40-48hrc. Hoc modum et faciam loci deformatio magnarum workpieces, et post extinxit, molere machina potest ad tere ad restituere originale machining accurate ex incremento in duritia. In incommodum est modus est quod temperatus est difficile ad imperium et requirit periti personas ad agunt.

2. Intermediate frequency induction quenching: The common frequency of intermediate frequency quenching of gray iron castings is 2500-8000Hz, and the surface of the workpiece is quickly heated to the quenching temperature and then sprayed with water or put into the quenching tank for cooling, the thickness of the quenching layer is about 3-5 mm, and the hardness is > 50HRC. Hoc est idoneam processus extinguere, medium et parva partes, a adjusting anode current, frequency et calefactio tempus, quod extinguat temperatus et altitudinem potest esse, quod est quod extinguatur, quod est in parva.

III. High-frequency inductione extinguens: Hoc extinguere processus idoneam ad parva workpieces ut Wrenches, bases, anni et machina instrumentum dux cancelli ad amplio duritiam. Et frequency usum durante operatio est 200-300khz, et calefactio celeritate est 200-1000 ° C per hora, in penetratio accumsan est relative vadum, quod extinguitur accumsan est de 1-2 mm altius extinxit temperatus, superiori. Et commoda stabilis qualitas, minus oxidatio et decarburization et parva deformatio workpiece.

4. Electrical contact self-cooling quenching, the principle is that the electrode is in contact with the surface of the workpiece, the contact is heated to the austenitic temperature with low voltage and high current, and then the electrode is moved to the entire quenching area in order, and the area cools naturally after heating. In extinguitur altitudo est de 0.2-0.3 mm et duritiam plus quam 50Hrc.

The user unit or gray iron casting production unit can choose the above quenching methods to improve the hardness of gray iron castings according to the actual size of the casting and the actual situation of the need to improve the hardness.