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What are the types of crusher hammers?

Date:2019-12-10 10:58 Source:cementepcViews:

The crusher hammer head is one of the core parts of the hammer crusher. It is arranged on the hammer shaft of the crusher rotor and directly hits the material when the hammer crusher is in operation.Crusher hammer heads play an important role in various fields. According to different types of crushed materials, crusher hammer heads also have different classifications. The following first briefly introduces the characteristics and classification of the hammer of the crusher.


I. What are the types of crusher hammers?


1. Forged hammer
Forging crusher hammer head is suitable for crushing cobblestone, coal gangue, limestone, etc. The hammer head of the forging crusher uses high-quality train wheel steel (material 65Mn, good impact resistance, strong toughness, good abrasion resistance, not easy to break). The metal blank is repeatedly forged by the forging machine to deform it to obtain certain mechanical properties A certain shape and size, after a special quenching and heat treatment method, to ensure that the working area of the hammer head has high hardness and high wear resistance.
Forging can eliminate defects such as as-cast looseness caused by metal during smelting, and optimize the microstructure. At the same time, the mechanical properties of forgings are generally better than that of castings due to the preservation of the complete metal streamline. Forged hammer heads are popular with customers because of their low price and economy and durability.


2. High fierce steel hammer head
Alloyed high-manganese steel wear-resistant hammer head with reliable quality and three times the wear resistance of traditional high-manganese steel. This crusher hammer head is widely used in large limestone crushers supporting domestic dry-dried cement production lines. With the continuous development of wear-resistant materials, high manganese steel has gradually become unsuitable for the development of modern foundry industry.
Replaced by chrome molybdenum alloy steel, high chromium cast iron and nickel hard cast iron. However, the high toughness of high manganese steel is unmatched by other wear-resistant materials. The hammer head of high manganese steel crusher has good toughness, good processability and low price. Its main characteristics are that under the action of large impact or contact stress, the surface layer will rapidly undergo work hardening, and its work hardening index is higher than other materials —7 times, the wear resistance has been greatly improved.
However, the hammer head of high manganese steel crusher has higher requirements on the overall performance of the crusher. If the physical impact force is insufficient or the contact stress is small in actual work, the surface cannot be rapidly worked hardened, so that it cannot exert its wear resistance Sex. Therefore, we hope that the majority of customers should choose according to the actual parameters of the equipment before use, and if necessary, can modify the equipment to maximize its economic benefits.


3. High chromium alloy hammer head
High chromium alloy crusher has excellent hardness and is a high-quality wear-resistant material. It has been widely used in fine crushers (third-generation sand making machines) and impact crushers with supporting hammer frames. Poor, easy to break without hammer support.
High chromium composite hammer head, that is, high manganese steel is used for the hammer handle, high chromium alloy is used in the working area of the hammer head, and the two are combined to make the head of the hammer head have high hardness, while the hammer shank has high toughness. The respective advantages of the materials overcome the shortcomings of a single material and meet the performance requirements of the hammer head.
Particularly suitable for crushing high hardness materials, such as quartz stone and basalt. However, the traditional manufacturing process is complicated, the process requirements are strict, and the price is high.


4. Cemented carbide hammer
Compared with other materials, the cemented carbide hammer head has higher hardness, flexural strength and impact, thermal fatigue resistance, good thermal hardness, low cost, etc., and solves the cracks, desoldering, and collapse that easily occur in high manganese materials Mouth, drop block and so on.
(1), ultra-high wear resistance, more than 20 times the high manganese steel hammer.
(2). Good resistance to mechanical and thermal shock.
(3), a wide range of applications, basically can be adapted to all broken industries.


5. Bimetal hammer head
The crusher hammer heads that are cast with two different metal liquids are bimetallic hammer heads. While the bimetallic hammer heads ensure the toughness of the hammer handle, the hammer head also has hardness and wear resistance.
The temperature of the bimetal hammer head during quenching is critical. Generally, the appropriate quenching temperature is selected according to the thickness of the wall of the part. The higher the quenching temperature, the higher the hardenability. Casting and heat treatment processes.

 


 

II. Impact of Crusher Hammer Casting


If the crusher hammer is not cast properly, it can cause defects such as blowholes. When the design of the crusher hammer head pouring system is not correct, the eddy current generated by the metal liquid will wrap the gas and cause the generation of pores; when the hammer is cast, the exhaust gas is poor, and the gas cannot be discharged from the mold will also cause the pores We strictly control the pouring temperature during pouring, and can not be interrupted evenly during pouring. In order to facilitate the venting of the mold, inclined pouring can be used.

After being used, the hammer of the crusher will wear to different degrees. Due to the low-impact working conditions, the work hardening effect of the surface of the hammer will also increase. The wear of the hammer refers to the surface of the metal hammer under the action of mechanical force. Gradually detached from the mother body, causing the performance of the hammer head to change, and the wear has the greatest impact on the service life of the hammer head.


III. How to extend the life of the crusher hammer?


1. During the working process of the crusher, uniformly add materials to the crushing cavity to avoid single-sided wear of the hammer head.
2. When the nature of the material changes, even if the working parameters of the crusher are changed, the wear of the hammer head due to the material is avoided.
3. When installing the hammer head, it should be in stable contact with the surface of the machine.


At present, the main types of hammers on the domestic market include forged hammers, high-manganese steel hammers, and high-chromium alloy hammers. However, these hammers are not abrasion-resistant and have a short service life. The combined method enables two kinds of metal liquids to be poured at the same time, the hammer handle part has toughness, and the hammer head part has hardness and wear resistance, which can greatly improve the service life of the product.

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