Definition of rod mill steel rod and processing method
Date：2019-07-05 16:01 Source：未知Views:
Rod mill steel rod refers to the grinding medium steel rod used in various rod mills. It is the same as the ball mill. It is necessary to have high strength and impact value, which is convenient for ensuring good wear resistance and low Broken bar rate.
In order not to respond to the national low carbon environmental protection, energy saving and consumption reduction, our factory special product has developed a new type of bar mill steel bar heat treatment skills, which promotes the steel bar's strength and tensile strength to greatly improve, greatly reducing the bar mill steel The coefficient of friction of the rod promotes the problem that the steel rod does not simply appear to be chaotic and broken.
The rod mill is usually selected from the wet-test overflow type. It can be used as a first-class open-circuit grinding. It is used in the first-level grinding of the artificial service stone sand, concentrator, and pharmaceutical power department. The barrel body is equipped with moderate grinding. Medium - steel rod
The choice of rod mill steel rods should choose the raw materials of large and medium-sized steelmaking plants. Today, the steel rods commonly used in the sale market in China are made of steel mills. The skill standards are not high, and the actual effect of wear resistance is deviated.
Due to its environmental protection, energy saving and high efficiency, the rod mill is easy to adjust and crush. It is widely used in coal chemical processing for coal chemical processing, quartz sand, silica sand, sand aerated, tungsten ore, potassium sodium feldspar, aluminum. Production of soil and other minerals. Rod mill steel rod refers to the grinding medium rod used in various rod mills. It is the same as the ball mill. It is necessary to have high strength and impact value, which is convenient for ensuring good wear resistance and low breakage. Bar rate. Regarding the left and right problems, Zhongnai Grinding Technology Co., Ltd. promoted the work experience of producing and grinding products for many years, and established the R&D department to carry out scientific research and scientific research, starting from the materials, after many years of exploration and social experience, in 2001 The company finally researched and developed a new type of wear-resistant rod mill steel bar (including the material composition, production process, production and production of patent equipment are independent product development). At this stage, the export value has already been exported to more than a dozen countries; the customers in China are booming; the customers' feedback on the use of the “Medium-resistant grinding rod mill steel rod” has increased by 3 times compared with the general economic benefits of general garden steel. In order not to respond to the national low carbon environmental protection, energy saving and consumption reduction, our factory special product has developed a new type of bar mill steel bar heat treatment skills, which promotes the steel bar's strength and tensile strength to greatly improve, greatly reducing the friction of the steel bar. The coefficient, which promotes the steel bar, does not simply cause chaos and broken bars.
The rod mill is usually selected from the wet-test overflow type. It can be used as a first-class open-circuit grinding. It is used in the first-level grinding of the artificial service stone sand, concentrator, and pharmaceutical power department. The barrel body is equipped with moderate grinding. Medium - steel rod selection rod mill steel rod should choose large and medium-sized steelmaking plant raw materials. Today, the steel rods commonly used in China's sales market are steel-rolled steel mills. The skill standard is not high, and the actual wear resistance deviation is The amount of use is huge, and the country's resources are in a lot of extravagance and waste. Yuangang is a material produced by a steel mill. It is not a finished product. There are many problems in using it as a rod mill steel rod.
1. The friction coefficient is very high: due to the low strength and poor ductility of the steel, the loss is very large. Together with the formation of the magnetic separation stage, the daily task is heavy and the cost is increased, which is harmful to the product quality.
2, two tips: the two sharp tips of the rod mill steel rod are caused by various reasons, the key is because the two ends of the rod mill steel rod and the raw material touch probability and the total area are beyond the middle position, forming two heads for reasonable grinding Time should be good at the middle. If there is a significant difference between the two heads and the middle, what a human eye can see, a steel rod is called "invalid" because it has not been properly grounded in the ball mill. Grinding effect.
3. Broken rod: The reason is that the raw materials are loose inside. The problem of steel billets in steel mills can only exceed the skill standards of internal steel mills, especially in the diameter of 75 mm. The steel billets of most steel mills can be designed, but the compression ratio and The hardenability is very low, that is, the mechanism is not strict. Because the original steel factory did not eliminate its internal thermal stress, the broken rod is like a burst-explosion, which is just beginning to happen inside. The basic principle of producing steel rods in steelworks is like blowing a balloon. The thermal stress inside must be given. Eliminate it to avoid breaking the stick.
4, bending rod: rod grinding machine steel rod bending rod is the key reason is that the steel strength is very low, soft, such as in the rod mill by the impact force and other external forces, it is very simple to bend. If there is a rod bending, the parallel surface arrangement of the steel rods in all the rod mills will be disordered. (The steel rods run parallel in the rod mill, and the raw materials are milled into small at least gaps. Particles or powders), lightly forming the steel bars in disorder, the rod mill is not efficient, but the rod mill is pulled out of the ball mill, the safety of the staff and its destruction rod mill and its Other production line equipment.
5, the yield is not high, and the passing products do not meet the rules. This problem confuses many of these companies. For various reasons, steel rods are also harmful to them. For example, the manufacture of various diameter rod mill steel bars is unscientific, the filling volume is unscientific, the addition of steel rods is unscientific, there is no immediate removal of invalid steel rods, etc. We all know that steel rods are solid and easy. Broken, too soft, easy to bend. According to many tests and proof materials, the hardness of the rod mill steel bar is about 50, the wear resistance is good, and the broken rod rate is the least. It is the choice of the strength of the rod mill steel rod. Therefore, at this stage, it seems that the product maintains the best shape of the rod mill steel bar table hard HRC50 up and down, the strength is declining toward the heart. In this way, together with the wear resistance of the rod mill steel bar, the ductility of the rod mill steel rod can be ensured, and the ductility of the rod mill steel rod can be reduced.
Rod mill steel bar skill standard:
1. The bar mill steel bar needs to have any strength, and the surface strength is close to HRC45-56.
2. The steel bar of the rod mill should have high fracture toughness, and the impact value is Ak>13j/cm2. The style is the standard test piece without gap at normal temperature.
3, the rod mill steel rod should be developed for the industrial production straightening, bending degree <0.4%, all the normal use of the whole process can not occur the degree of bending is more serious than the standard damage rod mill output and finished product quality .
4, the surface of the rod mill steel bar should be leveled, no visible defects such as burnt, cracks, obvious burrs, lack of meat.
5, rod mill steel rods need to be delivered in a fixed length, the inner hole should be flat and bright without chamfering, length and error ± 12 mm, diameter error ± 2 mm.
6. The breaking rate of rod mill steel bars is <1%.
7. In order to ensure the quality of the rod mill, the dealer must straighten and heat-treat the grinding rod, and pass the devastating test to pass the test. The delivery report and the fall detection report are issued at the time of delivery, and the official seal of the company is stamped.
8. Before the original mill of the rod mill, it is necessary to carry out inspections on the composition, process performance, strength, condition, non-straightness, diameter and length error, and present relevant reports and certificates of conformity.