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A kind of casting tbm knife box and preparation method
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A technology of knife box and knife seat, which is applied in the direction of casting molding equipment, casting molds, mining equipment, etc., can solve the problems of knife box process steps, large rough machining allowance, easy crushing, etc., and achieve reduction of machining allowance, Effect of reducing wear and enhancing life
Active Publication Date: 2020-10-02
CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD
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[0003] The present invention proposes a casting TBM knife box and its preparation method, which solves the problems of many technological steps of the existing knife box, large rough machining allowance, easy crushing and cracks
Method used
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Embodiment 1
[0034] A cast TBM knife box, the knife box is a three-layer composite form of an upper knife seat 101, a middle knife seat 102 and a lower knife seat 103, the upper knife seat 101 is made of high-toughness wear-resistant steel material, and the middle knife seat 102 is made of high-strength Alloy steel material, the lower knife seat 103 adopts ordinary structural steel material.
[0035] The upper tool seat 101 includes the following components by weight percentage: C: 2.0%, Si: 0.2%, Mn: 0.4%, Cr: 17%, W: 0.9%, V: 0.07%, S: ≤0.02%, P: ≤0.02%, the balance is iron.
[0036] The middle tool holder 102 includes the following components by weight percentage: C: 0.3%, Si: 0.2%, Mn: 0.4%, Cr: 1.5%, Ni: 2%, W: 0.9%, V: 0.2%, Ti : 0.2%, S: ≤0.02%, P: ≤0.02%, and the balance is iron.
[0037] The lower tool seat 103 includes the following components in weight percentage: C: 0.12%, Si: 0.2%, Mn: 0.38%, V: 0.07%, S: ≤0.02%, P: ≤0.02%, and the balance is iron .
[0038] The preparatio...
Embodiment 2
[0048] A cast TBM knife box, the knife box is a three-layer composite form of an upper knife seat 101, a middle knife seat 102 and a lower knife seat 103, the upper knife seat 101 is made of high-toughness wear-resistant steel material, and the middle knife seat 102 is made of high-strength Alloy steel material, the lower knife seat 103 adopts structural steel material.
[0049] The upper tool seat 101 includes the following components in weight percentage: C: 2.3%, Si: 0.3%, Mn: 0.5%, Cr: 18%, W: 1.1%, V: 0.10%, S: ≤0.02%, P: ≤0.02%, the balance is iron.
[0050] The middle tool seat 102 includes the following components by weight percentage: C: 0.35%, Si: 0.3%, Mn: 0.5%, Cr: 2.0%, Ni: 2.8%, W: 1.1%, V: 0.3%, Ti : 0.3%, S: ≤0.02%, P: ≤0.02%, and the balance is iron.
[0051] The lower tool seat 103 includes the following components by weight percentage: C: 0.15%, Si: 0.3%, Mn: 0.45%, V: 0.10%, S: ≤0.02%, P: ≤0.02%, and the balance is iron .
[0052] The preparation method...
Embodiment 3
[0062] A cast TBM knife box, the knife box is a three-layer composite form of an upper knife seat 101, a middle knife seat 102 and a lower knife seat 103, the upper knife seat 101 is made of high-toughness wear-resistant steel material, and the middle knife seat 102 is made of high-strength Alloy steel material, the lower knife seat 103 adopts structural steel material.
[0063] The upper tool seat 101 includes the following components in weight percentage: C: 2.5%, Si: 0.4%, Mn: 0.6%, Cr: 20%, W: 1.3%, V: 0.12%, S: ≤0.02%, P: ≤0.02%, the balance is iron.
[0064] The middle tool holder 102 includes the following components by weight percentage: C: 0.38%, Si: 0.4%, Mn: 0.6%, Cr: 2.5%, Ni: 3.2%, W: 1.3%, V: 0.4%, Ti : 0.4%, S: ≤0.02%, P: ≤0.02%, and the balance is iron.
[0065] The lower tool seat 103 includes the following components in weight percentage: C: 0.18%, Si: 0.4%, Mn: 0.58%, V: 0.12%, S: ≤0.02%, P: ≤0.02%, and the balance is iron .
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Abstract
The invention provides a cast TBM cutter box and a preparation method. The cutter box is in a three-layer composite form of an upper cutter holder, a middle cutter holder and a lower cutter holder, the upper cutter holder adopts a high-toughness wear-resistant steel material, the middle cutter holder adopts a high-strength alloy steel material, the lower cutter holder adopts a structural steel material, and the upper cutter holder, the middle cutter holder and the lower cutter holder are combined together through a casting method of multi-metal composite materials. According to the cast TBM cutter box and the preparation method, the cutter box is divided into a three-layer cutter holder composite form of the upper cutter holder, the middle cutter holder and the lower cutter holder, and thecutter box is completed through a casting process; compared with a traditional forging and welding mode, the machining allowance of the cutter box is reduced, and the influence of welding stress is eliminated; a high-carbon and high-chromium material is poured on the upper cutter holder, and a high-hardness wear-resisting layer is formed after cooling, so that abrasion to the surface of the cutter box is reduced; the middle cutter holder adopts the high-strength alloy steel material, the tensile strength can reach 1100 - 1200 Mpa after heat treatment quenching and tempering, and alternating stress borne by the cutter box can be effectively resisted, so that the service life is prolonged; and the lower cutter holder adopts the common structural steel material, so that the cost of the cutter box is effectively reduced.
Description
technical field [0001] The invention relates to the technical field of tunnel boring machines, in particular to a casting TBM cutter box and a preparation method thereof. Background technique [0002] At present, TBM tunnel boring machines for tunnel hard rock mainly rely on disc-shaped hobs to squeeze rocks to achieve the purpose of crushing rock mass. The hobs are the "teeth" for rock breaking, and the cutter box is the gum bed, which bears the alternating load during rock breaking. With the increase of rock strength, the efficiency of hob crushing rock gradually decreases, and the abnormal wear and replacement frequency of hob box also increase. Since the hob cutter box is welded on the cutter head, when there is a crack in the hob cutter box and needs to be repaired and replaced, it is necessary to remove the original welded cutter box and weld a new cutter box in the tunnel. This process takes two days or even longer, resulting in a reduction in shield tunneling effici...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information
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