Cold drawn steel bar is produced by Hot Rolled Steel Bar or wire rod to get smooth surface, more precision size, higher mechanical properties, which improves machining characteristics. It can also get various sections and sizes. So cold drawn steel bar is a better choice for machining users.
For high carbon steel or alloy steel bars, to avoid the cracks in inner or surface, the bars are usually required to be annealed before cold drawing.
To get different mechanical properties or hardness depending on final usage, the cold drawn bars will also be heat treated such as annealed, normalized or quenched and tempered(Q&T).
For CNC machines usage, to get much more precision sizes or much more better surface roughness for chrome plating, the cold drawn steel bars can also be centerless ground or polished.
We have more advantages on producing cold drawn steel bars:
1) Big stocks of hot rolled round bars or wire rods as raw materials
2) Wide range of cold drawn steel bar sizes: from 10mm to 150mm
3) Different cold drawing medias powder or oil to get different surface
4) Straightening machines to get better straightness up to 0.5mm/m
5) Grinding and polishing machines to get better roughness upto 0.4um
6) Heat treating furnaces to adjust the mechanical properties
7) Full sets of testing equipment to test the sizes, mechanical properties and microstructure.
8) Multiple packages to avoid broken packages and anti-rusty
Cold Drawn Steel Bar,Cold Drawn Steel Rod,Cold Drawn Steel,Cold Drawn Steel Bar Manufacturers,Cold Drawn Steel Properties SHANDONG LE REN SPECIAL STEEL CO., LTD. , https://www.sdcolddrawnsteelbar.com
When the diaphragm pressure gauge measures the pressure, the working medium to be measured directly acts on the isolating diaphragm, and the diaphragm is upwardly deformed upward, and the medium pressure is transmitted to the spring tube through the filling liquid in the spring tube, so that the end of the spring tube is elastically deformed. With the linkage mechanism, the core gear shaft is rotated, so that the pointer indicates the measured pressure value on the dial.
Usually before we use the diaphragm pressure gauge, there is a verification procedure, including the diaphragm pressure gauge visual inspection, diaphragm pressure gauge inspection zero position and diaphragm pressure indication value verification.
Pressure gauge appearance check:
Mainly check whether the zero parts of the verification step are tightly installed and loose. Check whether the indexing plate is marked with the manufacturing position, product name, accuracy grade and factory number. Check whether the surface of the diaphragm pressure gauge is transparent. Whether the mark is legible.
Pressure gauge zero check:
Check if there is no pressure, for the diaphragm pressure gauge with the pointer, the pointer is close to the pointer pin; for the pressure calibrator without the pointer pin, whether the zero position is at the zero mark, check whether the zero mark is Exceeding the accuracy level allows 2 times the error value.
Pressure indication value check:
The indication value verification mainly checks the indication error, the backlash error and the tapping displacement.
At the time of inspection, the indication values ​​of each verification point shall be verified according to the criteria of steady boost. During the verification process, observe whether the pointer is bouncing or stuck, and then smoothly step down to observe whether the return error is greater than the allowable error. The value is to be boosted and lowered at the verification point. Hit the case and observe whether the amount of pointer displacement is greater than 1/2 of the value error when striking the case.
During the verification process, it should be noted that the diaphragm pressure gauge cannot be adjusted. After the end of the verification, the inspection of the zero point is sufficient, and in the absence of pressure load, for the diaphragm pressure gauge with the pointer pin, observe the pointer. Whether it is close to the pointer pin; for the pressure gauge without the pointer pin, observe whether the zero position is at the zero mark.