Defects in stainless steel joints during quenching

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In the process of heat treatment of stainless steel pipe fittings, one not careful, stainless steel pipe fittings stainless steel pipe fittings quenching process of the common defects often appear some defects, thus affecting the quality of the products of heat treatment, appear even scrapped, so there must be taken to be flaring type joint effect measures to prevent, and to have defects, should be set to save, the emphasis on analysis of common defects in stainless steel pipe fittings quenching process, the dongguan full model full copper joints and make the corresponding preventive and remedial measures.

Defects: shenzhen full model plastic joint overheating and over-burning

Cause: the heating temperature is too high or the heating time is too long

Preventive and remedial measures for yonghua sleeve pipe fittings:

1. Correctly select the quenching heating temperature and heating time

2. The contralateral thermometer is calibrated regularly to prevent overtemperature due to instrument failure

Stainless steel pipe processing

3. Reasonably install the furnace to prevent the workpiece from being too close to the heating body

Defect: hardening distortion

Causes:

1. Stainless steel casting workpiece shape asymmetry or thickness disparity

2. The machining stress is large and it is not eliminated before quenching

3. Uneven heating and cooling

4. Improper heating clamping and cooling of the workpiece yonghua welded pipe joint

5. Transformation of quenching structure

Preventive and remedial measures:

1. Improve the structure of the workpiece, select materials reasonably and adjust the machining allowance

2. Increase the process of preheat or stress removal annealing to carry out reasonable preliminary heat treatment

3. Multiple preheating, precooling quenching, dual-liquid quenching, graded quenching and isothermal quenching are adopted

4. Correctly operate and properly support and bundle the workpiece for quenching and heating, and disperse cooling

5. Calibrate the deformed workpiece.

About stainless steel pipe parts processing knowledge focus topic, I rely on many years of production of stainless steel pipe parts processing knowledge experience, and consult the relevant information on stainless steel pipe parts processing knowledge opinion is very unique.

1. Forging and pressing method: the end or part of the pipe is punched and extended by the forging machine to reduce the outer diameter. The commonly used forging machine includes rotary forging machine, connecting rod forging machine and roller forging machine.

2. Stamping method: expand the pipe end to the required size and shape on the punch press with the core with taper.

3. Roller method: place the core inside the tube and push and press with the roller around, which is used for circular edge processing.

4. Rolling method: generally no spindle, suitable for the inner round edge of thick wall tube.

5. Bending forming method: there are three methods commonly used. Taizhou full model PU tube has one method called stretching method, another method called stamping method, and the third roller method.

6. Swelling method: one is to place rubber in the tube, and use punch to compress the top to make the tube protrude into shape;Another method is called hydroforming, in which liquid is filled in the middle of the pipe and the pressure of the liquid pushes the pipe into the desired shape. This method is used in most bellows production.