阅读说明：本技术 一种包套真空钎焊整体热处理盾构刀及其制造方法 (Sheathed vacuum brazing integral heat treatment shield cutter and manufacturing method thereof ) 是由 黄齐文 熊钊颋 黄闻欣 于 2021-08-18 设计创作，主要内容包括：本发明公开一种包套真空钎焊整体热处理盾构刀及其制造方法,所述盾构刀包括盾构刮刀和盾构滚刀,目的是对有多个硬质合金块体的盾构刀进行整体钎焊和整体热处理,优化钎焊质量、提高盾构刀基体机械性能,从而大幅提高盾构刀使用寿命。包套真空钎焊整体热处理盾构刀由以下部分组成：盾构刀刀体、硬质合金块体、钎焊合金和薄壁钢板制成的包套壳体及焊接于包套壳体上与包套壳体内部相同的抽真空管嘴,通过抽真空管嘴对包套体内抽真空至真空度为100帕以内,包套壳体保持包套体内的真空度的条件下完成盾构刀整体钎焊和热处理。(The invention discloses a sheathed vacuum brazing integral heat treatment shield cutter and a manufacturing method thereof, wherein the shield cutter comprises a shield scraper and a shield hob and aims to perform integral brazing and integral heat treatment on the shield cutter with a plurality of hard alloy blocks, so that the brazing quality is optimized, the mechanical property of a shield cutter base body is improved, and the service life of the shield cutter is greatly prolonged. The sheathed vacuum brazing integral heat treatment shield cutter consists of the following parts: the shield cutter comprises a shield cutter body, a hard alloy block, a cladding shell made of brazing alloy and a thin-wall steel plate and a vacuumizing nozzle welded on the cladding shell and identical to the inside of the cladding shell, the cladding shell is vacuumized by the vacuumizing nozzle until the vacuum degree is within 100 Pa, and the whole brazing and heat treatment of the shield cutter are completed under the condition that the cladding shell keeps the vacuum degree in the cladding shell.)

1. The invention discloses a sheathed vacuum brazing integral heat treatment shield cutter and a manufacturing method thereof, and is characterized by comprising the following steps:

1) the sheathed vacuum brazing integral heat treatment shield cutter consists of the following parts: the shield cutter comprises a shield cutter body, a hard alloy block, a sheath shell made of brazing alloy and a thin-wall steel plate and a vacuumizing nozzle welded on the sheath shell and communicated with the interior of the sheath shell;

2) the sheathed vacuum brazing integral heat treatment shield cutter is characterized in that a sheath shell is used for sheathing the body part of a shield cutter body, a hard alloy block body fixed in the sheath body and alloy powder or a plate for brazing connection on the shield cutter body, the sheath shell and the shield cutter body are connected and packaged in a welding mode, and brazing and heat treatment are completed under the conditions of vacuumizing and maintaining vacuum in the sheath body;

3) the manufacturing method of the sheathed vacuum brazing integral heat treatment shield cutter comprises the following steps: the method comprises the steps of manufacturing a sheathing shell which can sheath a shield cutter body library part and a hard alloy block fixed in the library body and can form a sealed space with a shield cutter body by using a thin-wall steel plate, welding a vacuumizing nozzle communicated with the sheathing shell on the sheathing shell, sheathing the shield cutter body library part, the hard alloy block fixed in the library body and alloy powder or a plate for braze welding on the shield cutter body by using the sheathing shell, connecting the sheathing shell on the shield cutter body in a welding mode to form a sealed space in the sheathing shell, vacuumizing the sheathing body to a vacuum degree within 100 Pa by using the vacuumizing nozzle, packaging, welding and vacuumizing the vacuumizing nozzle to obtain a sheathing body of the sheathing vacuum brazing integral heat treatment shield cutter to be heated and brazed, placing the sheathing body in an atmosphere protection furnace, heating the sheathing body to a brazing material temperature and preserving heat for a certain time, and the sheath shell completes brazing and heat treatment under the condition of keeping the vacuum degree in the sheath body.

2. The heat treatment according to claim 1 is salt bath austempering, which reduces the thermal stress of the cemented carbide block, optimizes the structure performance of the shield cutter body base body, and greatly improves the service life of the shield cutter.

3. The shield cutter of claim 1 comprising a shield scraper and a shield hob.

Technical Field

The invention discloses a sheathed vacuum brazing integral heat treatment shield cutter and a manufacturing method thereof, wherein the shield cutter is an engineering machinery crushing and tunneling tool, and the manufacturing method thereof belongs to the technical field of welding.

Background

The shield cutter is a tunneling tool in the tunneling engineering of the shield machine, and the insufficient wear resistance of the shield cutter made of a single steel material is replaced by the shield cutter brazed with the hard alloy block; because the large-size hard alloy blocks are difficult to manufacture and difficult to braze, connect and fix with the steel cutter body of the shield cutter, a plurality of small-size hard alloy blocks are adopted to braze and fix on the steel cutter body of the shield cutter in a split manner; the shape of the reservoir body on the steel cutter body of the shield cutter for brazing the hard alloy blocks and the height difference of the brazing positions of the plurality of hard alloy blocks cannot keep brazing filler metal liquid not to flow away at the brazing positions of the required hard alloy blocks, so that the plurality of hard alloy blocks on one shield cutter cannot be integrally heated at one time to complete the brazing process of the brazing shield cutter, and therefore, the brazing of the plurality of hard alloy blocks can only be carried out by locally heating the single hard alloy block under the atmospheric condition, the thermal stress formed by the brazing process is large, the brazing quality is not high, and the hard alloy blocks are cracked or even fall off due to the reasons in the using process; the invention discloses a sheathed vacuum brazing integral heat treatment shield cutter and a manufacturing method thereof, aiming at carrying out integral brazing and integral heat treatment on the shield cutter with a plurality of hard alloy blocks, optimizing brazing quality, improving the mechanical property of the shield cutter base and greatly prolonging the service life of the shield cutter.

Disclosure of Invention

The invention discloses a sheathed vacuum brazing integral heat treatment shield cutter and a manufacturing method thereof, wherein the shield cutter comprises a shield scraper and a shield hob and aims to perform integral brazing and integral heat treatment on the shield cutter with a plurality of hard alloy blocks, so that the brazing quality is optimized, the mechanical property of a shield cutter base body is improved, and the service life of the shield cutter is greatly prolonged.

The sheathed vacuum brazing integral heat treatment shield cutter consists of the following parts: the shield cutter comprises a shield cutter body, a hard alloy block, a sheath shell made of brazing alloy and a thin-wall steel plate and a vacuumizing nozzle welded on the sheath shell and communicated with the interior of the sheath shell.

The sheathed vacuum brazing integral heat treatment shield cutter is characterized in that a sheath shell is used for sheathing a part of a cutter body of the shield cutter, a hard alloy block body fixed in the cutter body and alloy powder or a plate for brazing connection on the cutter body of the shield cutter, the sheath shell and the cutter body of the shield cutter are connected and packaged in a welding mode, and brazing and heat treatment are completed under the conditions of vacuumizing and keeping vacuum in the sheath body.

The manufacturing method of the sheathed vacuum brazing integral heat treatment shield cutter comprises the following steps: the method comprises the steps of manufacturing a sheathing shell which can sheath a shield cutter body library part and a hard alloy block fixed in the library body and can form a seal with a shield cutter body by using a thin-wall steel plate, welding a vacuumizing nozzle communicated with the sheathing shell on the sheathing shell, sheathing the shield cutter body library part, the hard alloy block fixed in the library body and alloy powder or a plate for braze welding connection on the shield cutter body by using the sheathing shell, connecting the sheathing shell and the shield cutter body in a welding mode to form a sealed space in the sheathing shell, vacuumizing the sheathing shell to a vacuum degree within 100 Pa by using the vacuumizing nozzle, packaging, welding and vacuumizing the vacuumizing nozzle to obtain a sheathing body of the sheathed vacuum braze welding integral heat treatment shield cutter to be heated and brazed, placing the sheathing body in an atmosphere protection furnace, heating the sheathing body to a brazing material and keeping the temperature for a certain time, the sheath shell finishes brazing and heat treatment under the condition of keeping the vacuum degree in the sheath body, the heat treatment is salt bath isothermal, the thermal stress of the hard alloy block is reduced, the structure performance of the shield cutter body base body is optimized, and the service life of the shield cutter body base body is prolonged greatly.