End-quenching tester

KMDC-2/4/6 seriesEnd-quenching testerCompared with the ordinary end quenching tester, it has been improved in the following aspects to make it more high-tech, stable, and progressiveness, and more convenient for users.

The advanced digital quenching time control system is adopted, which can automatically complete the entire working cycle of start automatic water spraying quenching end alarm. The overall design layout is reasonable, the structure is compact, easy to use, and convenient for maintenance and repair.

Key Features:

The testing machine consists of a frame, high and low water tanks, an automatic water circulation system for water pumps, a water spray time setting system, an automatic quick opening device for nozzle baffles, and a water temperature regulation control system.

2. The entire testing machine (water tank nozzle bracket frame panel shelf) is welded with J304 stainless steel, and the water tank, nozzle, and other parts that come into long-term contact with water are made of 1Cr18Ni9Ti stainless steel.

3. The control of the water spray start function adopts two methods: automatic control and manual control using high-sensitivity photoelectric sensors (standard is manual control).

4. The time control adopts high-precision digital display time relay with time sound alarm function. After reaching the set time, the water blocking plate will automatically close. The spraying time of each nozzle can be set separately, and the spraying height can be adjusted separately to maintain the stability of the water column.

5. The water temperature control adopts compressor refrigeration and heating rod heating. The water temperature control accuracy is high, and the water tank is equipped with temperature control instruments.

The various measuring instruments used and installed are easy to disassemble for inspection.

7. Install the inlet and outlet pipes, with a diameter of 6 pipes for each inlet pipe.

The alignment between the inner hole of the sample holder and the nozzle is stable and easy to adjust (equipped with a dedicated center height adjuster)

2、 KMDC-2/4/6 seriesEnd-quenching testerMain technical data:

Table 1 Main Technical Data of End Quenching Testing Machine

3、 The meaning and measurement method of hardenability:

Hardenability is an important heat treatment process property of steel, which refers to the ability of steel to form martensite during quenching. Generally, it is represented by the depth of the hardened layer of cylindrical specimens or the hardness distribution curve along the cross-section.

Bury the quenched standard sample at the end and heat it in a box type electric furnace to prevent oxidation and decarburization during the heating process; The heating temperature is 860 ± 10 ℃, kept for 40 minutes, and immediately placed on the end quenching test equipment to spray water and cool to room temperature. The shorter the time interval between baking and spraying, the better to prevent oxidation in the air.

After cooling to room temperature, grind a narrow plane along the length direction of the sample. Starting from the water-cooled end, measure the Rockwell hardness (HRC) every 1.5mm on the long and narrow surface ground. When the hardness value decreases and stabilizes, it can be measured every 3mm. Generally, measurements should be taken to a distance of 30-40mm from the water-cooled end, and records should be kept.

Draw a curve showing the hardness value as a function of distance from the water-cooled end, which is the hardenability curve.

4、 KMDC-2/4/6 series end quenching testing machine components

1. Adjustable bracket

Made entirely of stainless steel, it can be adjusted to any height to meet the height requirements of American and other standards for specimens. The bracket holes can be customized according to other requirements, and the spray nozzle adopts a nut type installation port.

2. Photosensitive sensing device

Each workstation is equipped with a pair of photoelectric sensors, and each workstation works independently. Rapid induction, in automatic mode, placing the sample will start the quenching process, avoiding the sample from being exposed to air for too long and affecting the quenching test results.

3. End quenching testing machine accessories

The end quenching testing machine comes with the following accessories when it leaves the factory: washing machine specific water pipe, drainage pipe, center calibrator, standard sample, and glue.