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A kind of preparation method of compound hammerhead of hammer crusher
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A technology of hammer crusher and composite hammer head, which is applied in the field of preparation of hammer crusher composite hammer head, can solve the problems of limited wear resistance improvement, fast cooling speed, large WC specificity, etc., and achieve high wear resistance and High strength and toughness, simple manufacturing process and low manufacturing cost
Active Publication Date: 2018-04-20
GUANGDONG INST OF NEW MATERIALS
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Problems solved by technology
The problem with this invention is that when the molten metal contacts the cold iron at the interface, due to the fast metal cooling rate at the cold iron, it is easy to form a cold barrier defect at the interface. fall off
[0009] 1) It is difficult to obtain a stable metallurgical bond at the double-liquid composite interface, and the use of high-chromium cast iron for the wear part of the hammer head has limited improvement in wear resistance;
[0010] 2) In the hard particle reinforced steel-based composite hammer head, WC is easy to peel off and crack. At the same time, WC has a large specificity and high price, which greatly increases product cost and energy consumption, making it difficult to industrialize
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preparation example Construction
[0032] 1) The preparation of composite hammer mold 1 is to use 20-140 mesh quartz sand with a mud content of 2 Hardening, brushing zircon powder quick-drying paint on the cavity surface of the mold; and the mold is provided with a sprue 2 and two inrunners, and the inrunner 4 at the bottom is used for pouring low-carbon low-alloy steel 6, the inner runner 3 on the upper layer is used for pouring high-chromium cast iron 7, and the mold is also provided with an observation hole 5, which doubles as a compound hammer head riser;
[0033] 2) Add Al 2 o 3 Ceramic particles or ZrO 2 The ceramic particles or ZTA ceramic particles are mixed with the binder evenly and placed in the shaping mold, and solidified to obtain a strip-shaped or plate-shaped preform 8 with three-dimensional interconnection and multi-dimensionality, and the ability to resist high-temperature liquid metal erosion without collapsing;
[0034] 3) Fix the prefabricated body 8 in the cavity of the above-mentioned c...
Embodiment 1
[0039] The high chromium cast iron adopts Cr15 type, the composition is (weight percentage) C: 3.6%, Cr: 15%, Mo: 0.5%, Ni: 0.5%, Si: 0.6%, Mn: 0.6%, S≤0.04%, P≤ 0.04%, the rest is Fe;
[0040] Low-carbon low-alloy steel composition (weight percent) C: 0.28%, Cr: 1%, Si: 0.6%, Mn: 0.6%, P≤0.04%, S≤0.04%, Al: 0.025%, and the rest is Fe;
[0041]The ceramic particles are made of Al 2 o 3 Ceramic particles, the Al 2 o 3 Ceramic particles are mixed with 3% binder and placed in a shaped mold, solidified to obtain Al 2 o 3 Ceramic particle preform;
[0042] The composite hammer head mold is made of 20-140 mesh quartz sand, with a mud content of <0.2%, added with 5% water glass, and hardened by CO2, and the cavity surface of the mold is painted with zircon sand quick-drying paint;
[0043] The box is fixed on a mechanical vibration device, and two intermediate frequency furnaces are used to melt Cr15 high-chromium cast iron liquid and low-carbon low-alloy steel liquid respecti...
Embodiment 2
[0047] The difference between this embodiment and embodiment 1 is:
[0048] High chromium cast iron adopts Cr20 type, the composition is (weight percentage) C: 3.2%, Cr: 20%, Mo: 0.5%, Ni: 0.5%, Si: 0.6%, Mn: 0.6%, P≤0.04%, S≤ 0.04%, the rest is Fe;
[0049] Low-carbon low-alloy steel composition (weight percent) C: 0.3%, Cr: 1%, Mn: 0.6%, Si: 0.6%, P≤0.04%, S≤0.04%, Al: 0.025%, and the rest is Fe.
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Abstract
A manufacturing method for a composite hammer head of a hammer crusher includes the steps that firstly, a composite hammer head mould is manufactured; secondly, ceramic particles are fixed in the mould to manufacture a cavity of a use part of the hammer head; thirdly, mould assembling is conducted, wherein the mould is fixed to a mechanical vibration device, low-carbon and low-alloy steel is cast at first, then, high-chromium iron is cast, the mechanical vibration device is started while the high-chromium iron is cast, mechanical vibration enables the mould to be solidified, and the composite hammer head can be obtained through processing after the mould is cooled; fourthly, the composite hammer head is subjected to thermal treatment. According to the manufacturing method, the ceramic particles are adopted in the use part of the hammer head to reinforce the high-chromium iron composite materials, the low-carbon and low-alloy steel with good obdurability is adopted in an installation area, and the composite hammer head is manufactured in a bi-liquid compositing method; meanwhile, diffusion of elements in an interface of the liquid high-chromium iron and liquid low-carbon and low-alloy steel is accelerated through a mechanical vibration method, therefore, stable interface metallurgical bonding is achieved, high abrasive resistance and high obdurability of the composite hammer head are achieved, an abraded region is not prone to falling off, and the service life of the composite hammer head is long; in addition, by the adoption of the manufacturing method, the manufacturing process is simple, the manufacturing cost is low and the practicability is high.
Description
technical field [0001] The invention relates to a method for preparing a hammer head of a hammer crusher, in particular to a method for preparing a composite hammer head of a hammer crusher. Background technique [0002] The hammer head of the wear-resistant part of the hammer crusher breaks stones under high-speed rotation. It is required that the use part of the hammer head should have high wear resistance, and the installation part should have high strength and toughness. It is difficult to guarantee the working condition of the hammer head with a single material. The preparation method can well solve the problem of wear resistance and high strength and toughness faced by a single material. However, there are many problems to be solved in the preparation method and material selection of the existing composite hammer head. [0003] The Chinese patent application with the publication number CN201530904A discloses a crusher composite material hammer and its negative pressur...
Claims
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Application Information
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