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.sdbrightsteelbar.com
Journal of Pengcheng Vocational University Journal of Large-diameter Arc Gear Cutting Depth Measurement Tao Yuehong Long Wenmei (Xuzhou Petroleum Machinery Factory, Xuzhou, Jiangsu 221008, China) The cutting depth control is best used to detect the full tooth depth. The method is simple and easy, and the accuracy of the gear is effectively controlled, thereby greatly reducing the generation of waste products.
86C article number 1008 - Arc gear not only has strong bearing capacity, but also has high contact strength and bending strength, so it has been widely used in various fields such as metallurgy, mining, petroleum, and chemical industry. Due to the high precision of the radial position of the arc gear profile, it is necessary to check during machining to adjust the depth of the infeed. The detection of circular arc gears can be divided into two categories according to the nature of the measured dimensions: one is to directly reflect the depth of the cutting teeth (such as the tooth depth and the root circle) and the other is to indirectly reflect the depth of the cutting teeth (such as the string tooth thickness and the common normal). ).
Although the common normal line measurement is convenient, the measuring instrument is simple, and the measuring reference is not affected by other surfaces. However, when measuring the length of the common normal line, the tooth width must satisfy the following conditions: W: the length of the common normal line; the helix angle.
The root circle size directly reflects the depth of the cutting tooth. The measuring point is on the two machined surfaces of the tooth bottom and is not affected by other surfaces. When measuring the small diameter circular gear, it can be measured by the root circular micrometer with a spherical probe. . However, when the gear diameter is large, the measurement accuracy is not easy to control.
The chord tooth thickness measurement is suitable for the measurement of large diameter gears, but its measurement is based on the tip circle. In order to eliminate the influence of the tooth tip circle deviation, when measuring with the tooth thickness vernier caliper, the value of the vertical vernier caliper is based on the actual tooth top. The circle is corrected, and the measured value of the horizontal vernier caliper and the actual infeed depth are obtained by converting the pressure angle.
The chord depth measurement can directly reflect the value of the cutting depth, but the measurement reference is still the tip circle. The measured value should also be corrected according to the actual size of the outer circle: firstly, the bow height must be calculated beforehand (full tooth depth and chord depth) Poor) Then calculate the difference between the actual outer circle and the theoretical outer circle, and finally calculate the actual string tooth depth. This method is more cumbersome for workers to actually calculate and is very error-prone. In addition, the measurement of the depth of the string tooth is carried out with a deep tooth micrometer (as shown in Fig. 1). On the one hand, the depth of the string depth micrometer is adjusted, and on the other hand, the string depth micrometer is placed. The normal position of the gear teeth is difficult to adjust in two aspects. In general production, the machine tool feed mechanism is used to control the depth of cut, and the string tooth depth is used as the final inspection item.
(Fig. 1) Tooth depth micrometer (Fig. 2) Special tool for tooth depth. Our factory is a professional manufacturer of arc gear reducer. It has a history of more than 20 years. The products are sold to major oilfields all over the country. The performance of the device is good and has been stable. The fundamental reason is that the cutting depth of the arc gear of our factory is mainly to control the full tooth depth. The theoretical full tooth depth is given by the design drawings. In actual measurement, only the tip circle error is revised. However, the actual full tooth depth is measured by a special measuring tool for the tooth depth. The special measuring tool for the tooth depth (shown in Figure 2) is mainly composed of a watch stand, a dial indicator, a set screw, a dial indicator, and a set screw. All are standard parts and can be purchased out, so only one frame must be made. In actual measurement, the table frame can be fixed at the full tooth depth position, and the dial indicator can be read after it is stable. The special measuring tool is derived from the tooth depth micrometer. It completely overcomes the problem of difficult measurement and adjustment of the tooth depth micrometer. The structure is simple and easy to operate. In actual production, the cutting depth of the circular gear is effectively controlled, which greatly reduces the cutting depth. The generation of gear waste.