Excavator Bucket Teeth Manufacturing Method

Excavator Bucket Teeth Manufacturing Method

Excavator Bucket Teeth Manufacturing Method
Excavator bucket teeth and its manufacturing method
Technical field
The present invention relates to technical field of engineering machinery, more particularly, to a kind of excavator bucket teeth and a kind of excavator bucket Tooth manufacturing method.
Background technique
Bucket tooth is the key that excavator vulnerable part, and manipulating object is ore, rock or soil, and working condition is very severe. When excavator works, not only there is serious abrasive wear in bucket tooth, while still suffering from certain shock loading, so bucket tooth Service life is often very short.
The low alloy bucket teeth that we use at present, bucket tooth service life are as follows: (1) lime stone, 500 hours or so;(2) Black Warrior Rock, 200 hours or so;(3) granite, less than 100 hours.
Ni (nickel), Si (silicon), B (boron) and Ti (titanium) is added, wherein the higher cost of Ni in bucket tooth in the prior art;Ti It is difficult to refine, production control is stringenter, and the time of addition is worthy of careful study very much;B is easy to aoxidize, once there is B on cast gate, can generate Harmful substance reduces impact flexibility;Otherwise Si can reduce impact flexibility, easily be broken not above 2.2%.Above-mentioned factor At high cost, the alloying element of bucket tooth is caused to be difficult to refine and produce control more difficulty.
Summary of the invention
The purpose of the present invention is to provide a kind of excavator bucket teeths, to solve at high cost, the conjunction of bucket tooth in the prior art Gold element is difficult to refine and produce the more difficult technical problem of control.
Excavator bucket teeth provided by the invention, each composition by weight percent of excavator bucket teeth are as follows:
C:0.27-0.36%, Si:1.3-2.0%, Mn:0.7-1.2%, Cr:1.9-2.7%, Ni :≤0.3%, Mo: 0.25-0.4%, P :≤0.03%, S :≤0.03%, Al:0.01-0.1%, surplus Fe.
Further, the tissue of the excavator bucket teeth is single martensitic structure.
The object of the invention is also to provide a kind of excavator bucket teeth manufacturing methods, comprising the following steps:
Choose each composition by weight percent are as follows:
C:0.27-0.36%, Si:1.3-2.0%, Mn:0.7-1.2%, Cr:1.9-2.7%, Ni :≤0.3%, Mo: 0.25-0.4%, P :≤0.03%, S :≤0.03%, Al:0.01-0.1%, surplus are the material of Fe;
The material is cast and is heat-treated to form bucket tooth.
Further, the materials microstructure is single martensitic structure.
Further, in casting step:
Calculate the cast gate and riser of excavator bucket teeth;
Cool down excavator bucket teeth by preset cooling condition;
Molten steel supplement is constantly carried out to excavator bucket teeth by riser, to reach consecutive solidification.
Further, the heat treatment adds quenching technical using high temperature normalizing.
Further, normalizing temperature is up to 1050 degree ± 10 degree.
Further, heat treatment soaking time is greater than or equal to 10 hours.
Further, fly-cutting riser when excavator bucket teeth as cast condition, and enter normalizing furnace.
Further, excavator bucket teeth hardness is determined according to formation hardness and abrasion mechanism.
Excavator bucket teeth provided by the invention, each composition by weight percent of excavator bucket teeth are as follows: C:0.27- 0.36%, Si:1.3-2.0%, Mn:0.7-1.2%, Cr:1.9-2.7%, Ni :≤0.3%, Mo:0.25-0.4%, P :≤ 0.03%, S :≤0.03%, Al:0.01-0.1%, surplus Fe.Compared with prior art, excavator bucket provided by the invention Essential element of the tooth using Cr as control material hardness, and be aided with Mn member and usually control toughness, impact flexibility is higher and quenches Permeability is good.By utilizing lower-cost Cr and Mn, reduces the content of Ni, to reduce cost, and do not use Re, V, Ti, B etc. are at high cost, are difficult to refine and produce to manage stringent metallic element, excavator bucket teeth can be made to have preferable wear-resisting While performance and toughness, metallic element is easy to refine, and the difficulty for reducing production cost, reducing production control can give birth in batches It produces.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the flow chart of excavator bucket teeth manufacturing method provided in an embodiment of the present invention;
Fig. 2 is the heat treatment cycle curve of excavator bucket teeth manufacturing method provided in an embodiment of the present invention.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill Personnel’s every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of excavator bucket teeth and its manufacturing methods, and multiple embodiments are given below and provide the present invention Excavator bucket teeth and its manufacturing method be described in detail.
Excavator bucket teeth provided in this embodiment, each composition by weight percent of excavator bucket teeth are as follows:
C (carbon): 0.27-0.36%, Si (silicon): 1.3-2.0%, Mn (manganese): 0.7-1.2%, Cr (chromium): 1.9-2.7%, Ni (nickel) :≤0.3%, Mo (molybdenum): 0.25-0.4%, P (phosphorus) :≤0.03%, S (sulphur) :≤0.03%, Al (aluminium): 0.01- 0.1%, surplus is Fe (iron).
Compared with prior art, main member of the excavator bucket teeth provided in this embodiment using Cr as control material hardness Element, and be aided with Mn member and usually control toughness, impact flexibility is higher and harden ability is good.By utilizing lower-cost Cr and Mn, Making the content of Ni reduces, to reduce cost, and it is at high cost without using Re, V, Ti, B etc., be difficult to refine and produce control sternly The metallic element of lattice, while excavator bucket teeth can be made to have preferable wear-resisting property and toughness, metallic element is easy to refine, The difficulty for reducing production cost, reducing production control, can produce in batches.
Further, the tissue of excavator bucket teeth is single martensitic structure.Single martensitic structure can make excavator Bucket tooth has good mechanical property, wear-resisting property and wilfulness is improved, to improve service life.
Excavator bucket teeth manufacturing method provided in this embodiment, as shown in Figure 1, comprising the following steps:
Choose each composition by weight percent are as follows:
C:0.27-0.36%, Si:1.3-2.0%, Mn:0.7-1.2%, Cr:1.9-2.7%, Ni :≤0.3%, Mo: 0.25-0.4%, P :≤0.03%, S :≤0.03%, Al:0.01-0.1%, surplus are the material of Fe;
The material is cast and is heat-treated to form bucket tooth.
Compared with prior art, excavator bucket teeth manufacturing method provided in this embodiment is using Cr as control material hardness Essential element, and be aided with Mn member and usually control toughness, impact flexibility is higher and harden ability is good.It is lower-cost by utilizing Cr and Mn reduces the content of Ni, to reduce cost, and it is at high cost without using Re, V, Ti, B etc., be difficult to refine and raw It produces and manages stringent metallic element, while capable of making excavator bucket teeth that there is preferable wear-resisting property and toughness, metallic element It is easy to refine, the difficulty for reducing production cost, reducing production control can be produced in batches.
Also, the mechanical property that can be improved excavator bucket teeth by casting and heat treatment, extends making for excavator bucket teeth Use the service life.
Further, materials microstructure is single martensitic structure.Single martensitic structure can be such that excavator bucket teeth has There is good mechanical property, wear-resisting property and wilfulness is improved, to improve service life.
Further, in casting step:
Calculate the cast gate and riser of excavator bucket teeth;
Cool down excavator bucket teeth by preset cooling condition;
Molten steel supplement is constantly carried out to excavator bucket teeth by riser, to reach consecutive solidification.
By above-mentioned casting step, the internal component segregation of excavator bucket teeth can be reduced, to improve excavator bucket teeth Mechanical property.
Optionally, in casting step, can excavator bucket teeth thickness increase cooling condition, reduce bucket tooth thin-walled with The cooling time of heavy wall is poor, reduces segregation.
Further, the heat treatment adds quenching technical using high temperature normalizing.Quenching is added using prolonged high temperature normalizing Technique can make excavator bucket teeth have good mechanical property, wear-resisting property and wilfulness be improved, to improve service life.
Wherein, normalizing temperature is 1050 degree, and heat treatment soaking time is greater than or equal to 10 hours.
Crystal grain can be refined by high temperature normalizing technique, and reduces the component segregation of excavator bucket teeth.
As shown in Fig. 2, air-cooled is 1050 DEG C × 600min, and water cooling is 950 DEG C × 180min, air-cooled in heat treatment process For 250 DEG C × 240min.
Further, fly-cutting riser when excavator bucket teeth as cast condition, and enter normalizing furnace.Prevent the as cast condition residence time long Lead to as cast condition metallographic crackle.
Further, excavator bucket teeth hardness is determined according to formation hardness and abrasion mechanism, to obtain being suitble to hardness Excavator bucket teeth.
Excavator bucket teeth provided in this embodiment, yield strength can achieve 1324MPa, and tensile strength can achieve 1528MPa, elongation after fracture are greater than 2.3%.It can make the life-span upgrading 30% of excavator bucket teeth.
Excavator provided in this embodiment, each composition by weight percent of excavator bucket teeth are as follows: C:0.27-0.36%, Si: 1.3-2.0%, Mn:0.7-1.2%, Cr:1.9-2.7%, Ni :≤0.3%, Mo:0.25-0.4%, P :≤0.03%, S :≤ 0.03%, Al:0.01-0.1%, surplus Fe.Compared with prior art, excavator bucket teeth provided in this embodiment is made using Cr To control the essential element of material hardness, and it is aided with Mn member and usually controls toughness, impact flexibility is higher and harden ability is good.Pass through Using lower-cost Cr and Mn, reduce the content of Ni, so that cost is reduced, and at high cost without using Re, V, Ti, B etc., It is difficult to refine and produce and manages stringent metallic element, can make excavator bucket teeth that there is preferable wear-resisting property and toughness Meanwhile metallic element is easy to refine, the difficulty for reducing production cost, reducing production control can be produced in batches.
The excavator bucket that embodiment 1, embodiment 2, embodiment 3 and comparative example (excavator bucket teeth in the prior art) provide Each composition by weight percent of tooth is shown in Table 1.
Test example
The tensile strength of the excavator bucket teeth that embodiment 1-3 and comparative example obtain, yield strength, elongation after fracture, hardness, Centre hardness and impact value are as shown in table 2.
Laboratory is carried out to the excavator bucket teeth that embodiment 1 and comparative example obtain using MDL-10 type end side abrasion wear test machine Friction-wear test, tests exemplar are as follows: excavator bucket teeth each 3 of excavator bucket teeth and the comparative example offer that embodiment 1 provides, It is taken respectively in excavator bucket teeth Cavity surface, side and tooth tip, every is no more than 120mm, sample matter with a thickness of 1-3mm, every leaf length Amount abrasion loss is as shown in table 3, and sample thickness abrasion loss is as shown in table 4.
It should be noted that the reduced value in table 3 and table 4 is: (embodiment abrasion loss-comparative example abrasion loss)/comparative example Abrasion loss.
Live Mining Test, excavator bucket teeth service life such as table 5 are carried out to the excavator bucket teeth that embodiment 1 and comparative example obtain It is shown.
It should be noted that the reduced value in table 5 is: (embodiment average life span-comparative example average life span)/comparative example is flat The equal service life.
On the basis of bucket tooth cost is not increased, the bucket tooth service life improves 31.4%.Suitable for mass production and use.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations;To the greatest extent Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into Row equivalent replacement;And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution The range of scheme.

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