WO2021197215A1 - 坯体以及具有螺旋状超硬材料前刀面的切削工具 - Google Patents

坯体以及具有螺旋状超硬材料前刀面的切削工具 Download PDF

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WO2021197215A1
WO2021197215A1 PCT/CN2021/083151 CN2021083151W WO2021197215A1 WO 2021197215 A1 WO2021197215 A1 WO 2021197215A1 CN 2021083151 W CN2021083151 W CN 2021083151W WO 2021197215 A1 WO2021197215 A1 WO 2021197215A1
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blank
cutting
tool
superhard material
cutting edge
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PCT/CN2021/083151
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English (en)
French (fr)
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孙思叡
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上海名古屋精密工具股份有限公司
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Priority to US17/765,985 priority Critical patent/US20220339720A1/en
Publication of WO2021197215A1 publication Critical patent/WO2021197215A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B23C5/1009—Ball nose end mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/0002—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D77/00—Reaming tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2240/00—Details of connections of tools or workpieces
    • B23B2240/16—Welded connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/12—Boron nitride
    • B23C2226/125—Boron nitride cubic [CBN]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/18—Ceramic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/31—Diamond
    • B23C2226/315—Diamond polycrystalline [PCD]

Definitions

  • the invention relates to a cutting tool, in particular to a cutting tool with a spiral superhard material rake face.
  • PCD Polycrystalline diamond
  • CBN cubic boron nitride
  • Cubic boron nitride (CBN or PCBN) is an artificial synthetic material whose hardness is second only to diamond and has good high temperature stability (high temperature will be generated when processing hardened ferrous metals and super alloy materials).
  • CBN tools are used for continuous or intermittent cutting of hardened ferrous metals, as well as for cutting welded metals and composite metals.
  • PCD cutter is made by welding PCD material on the cutter body.
  • PCD material is produced by sintering diamond particles with a metal-based binder under high temperature and high pressure together with a matrix material.
  • the PCD tool tip can be cut by electrical discharge machining or laser, and welded to a cemented carbide or steel substrate, and then sharpened to form a PCD tool.
  • This tool can process non-ferrous metals (such as aluminum) and highly abrasive synthetic materials at high speeds Especially effective when used with plastics.
  • PCD tools are widely used for milling non-ferrous metals, composite materials, plastics and super alloys that are extremely difficult to machine.
  • the center edge also known as backlash or chisel edge
  • the center edge plays an important role in cutting. Due to the small radius of gyration of the center edge, the low linear velocity, the front and rear angle angle is difficult to control, and its quality It is especially important for tool life and processing.
  • the helix angle is also very important to the cutting performance of the tool.
  • a large amount of literature shows that the cutting performance of the tool with the helix angle is better.
  • For tools with superhard material edges how to obtain a superhard material cutting edge with a helix angle and a superhard material center edge is the key direction of the tool manufacturing industry's continuous exploration.
  • the spiral sintering method is to fill the unsintered superhard material powder into a blank with pre-processed spiral grooves, and then sinter the blank and superhard powder at the same time to form a spiral superhard blade blank.
  • the main disadvantage of this solution is that the shape of the tool is limited by the shape of the sintered blank, and the helix angle parameter cannot be arbitrarily controlled.
  • the integral welding ablation method is to weld the entire cylindrical material made of superhard material to the tip of the tool and perform subtractive processing to directly obtain the spiral groove and spiral blade.
  • the processing is generally performed by laser.
  • the main disadvantage of this solution is Need to consume a lot of superhard materials, so the production cost is also high.
  • An object of the present invention is to provide a blank, which is mounted on a base to make a tool, which can control the helix angle parameters arbitrarily according to the design requirements of the tool.
  • Another object of the present invention is to provide a blank, which reduces the amount of superhard material and reduces the manufacturing cost of the tool.
  • Another object of the present invention is to provide a blank, which is mounted on a base to make a tool, and processed into a continuous cutting edge on the same superhard material to facilitate cutting and improve surface quality.
  • Another object of the present invention is to provide a cutting tool which can have a helical superhard material rake face greater than 15° to facilitate the formation of a continuous central cutting edge to facilitate the implementation of cutting and increase the life of the tool.
  • the fifth object of the present invention is to provide a chip cutting tool, which has a continuous superhard material center edge and a superhard material cutting edge that can have a helix angle greater than 15°, which improves the machining accuracy and efficiency, and improves the tool performance life.
  • Superhard materials such as: cermet, diamond (especially synthetic polycrystalline diamond) and cubic boron nitride, or composite materials formed by cemented carbide and one or more of cermet, diamond and cubic boron nitride.
  • Cutting tools are tools for cutting materials. In the industry, they are also called tools, such as drills, milling cutters, and reamers used for hole processing and forming processing.
  • a blank is made of superhard material and is used to be fixed on a base body and can be processed into a cutting edge part of a tool.
  • the blank includes a first side surface and a second side surface, which are twisted at a set helix angle.
  • a specific embodiment of the blank is plate-shaped, with a thickness greater than 0.3 mm and less than or equal to 4 mm, a length greater than 4 mm and less than or equal to 20 mm, and a width greater than 4 mm and less than or equal to 20 mm.
  • Another specific embodiment of the blank is in the form of a plate, with a thickness greater than 0.3 mm and less than or equal to 2 mm, a length greater than 4 mm and less than or equal to 16 mm, and a width less than or equal to 4 mm.
  • the blank After the blank is fixed to the base, it is processed into cutting edges, such as the main cutting edge and the central cutting edge, located on the same blank made of superhard material.
  • the blank also includes a third surface that intersects the first side surface and the second side surface, such as a flat surface, a curved surface, or a folded surface.
  • the third surface is located at the tip along the direction of the tool feed and is made of the same superhard material.
  • a machine tool with a rotary shaft is used to cut the superhard material to obtain the blank of the present invention.
  • the first spiral surface and the second spiral surface of the blank are usually arranged in parallel.
  • the spiral surface is obtained by twisting a plane, that is, cutting at the same angle, and the obtained arbitrary cross-sectional area is equal.
  • a tool including:
  • the blank is made of superhard material and has a plate shape, including a first plate surface and a second plate surface, the first plate surface includes at least a first spiral surface, and the first plate surface includes at least a second spiral surface;
  • a base body which includes a body and a longitudinal axis, the body revolves around the longitudinal axis, one end of the body is set as a shank that can be installed on a rotating machine, and the other end is set and processed into a cutting part for cutting processing.
  • the cutting part includes a spiral Shaped trough that traverses radially.
  • Assemble the blank and the trough (such as welding or bonding), and then process the blank on the blank to form a central cutting edge with a rake face and a flank close to the longitudinal axis, as well as a rake face and a rear face.
  • the main cutting edge of the face is
  • the main cutting edge is formed by a continuous and complete superhard material, with a spiral rake face (such as greater than 15°), and the central cutting edge is formed by the same piece of complete superhard material, which traverses the center of rotation.
  • the tool provided by the present invention obtains a main cutting edge formed of a continuous and complete superhard material, and can produce a spiral rake face greater than 15°, which is more conducive to cutting processing, such as significantly reducing Cutting force, improved chip removal, extended tool life and improved surface quality.
  • the tool provided by the present invention has a continuous and complete center cutting edge formed of superhard material on the center of rotation. Compared with existing tools, it not only improves the machining accuracy and efficiency, but also improves the strength of the center. The prolonged service life during processing has significantly improved the overall cutting performance of the tool.
  • the shape of the tool prepared by the technical solution of the present invention is not limited by the shape of the sintered blank, and the spiral angle parameter can be arbitrarily controlled according to the design requirements of the tool.
  • the tool prepared by the technical scheme of the present invention can greatly reduce the use of superhard materials and reduce the manufacturing cost of the tool.
  • Figure 1 is a schematic diagram of an embodiment of a blank used in the present invention
  • Figure 2 is a schematic diagram of the blank shown in Figure 1 from an angle
  • Fig. 3 is a schematic view of the blank shown in Fig. 1 from another angle;
  • Figure 4 is a schematic view of another embodiment of the blank used in the present invention.
  • Figure 5 is a schematic diagram of the blank shown in Figure 4 from one angle
  • Fig. 6 is a schematic view of the blank shown in Fig. 4 from another angle;
  • Figure 7 is a schematic diagram of an embodiment of a blank used in the present invention.
  • Fig. 8 is a schematic diagram of the blank shown in Fig. 7 from an angle
  • Fig. 9 is a schematic view of the blank shown in Fig. 7 from another angle;
  • Figure 10 is a schematic diagram of an embodiment of a base used in the tool of the present invention.
  • Figure 11 is a schematic diagram of an embodiment of the tool of the present invention.
  • Figure 12 is a schematic diagram of another embodiment of the tool of the present invention.
  • Figure 13 is a schematic diagram of another embodiment of the tool of the present invention.
  • Fig. 1 is a schematic diagram of an embodiment of a blank used for the tool of the present invention
  • Fig. 2 is a schematic diagram of the blank shown in Fig. 1 from one angle
  • Fig. 3 is a schematic diagram of the blank shown in Fig. 1 from another angle.
  • a machine tool with a rotary shaft is used to cut the superhard material to obtain a blank 100, which is in the shape of a plate as a whole, including a first side surface (or plate surface) 110 and a second side surface (Or board surface) 120, are twisted at the set helix angle.
  • the spiral cutting method of cutting from the side and rotating the composite sheet while cutting is adopted to obtain the blank with spiral side.
  • the blank also includes a plane 130 in the shape of a plane, which intersects the first side 110 and the second side 120.
  • the third plane 130 can also be a curved surface or a folded surface, as shown in FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8 and FIG. 9, to facilitate subsequent applications in cutting edge machining.
  • the thickness of the plate body is greater than 0.3 mm and less than or equal to 4 mm
  • the length is greater than 4 mm and less than or equal to 20 mm
  • the width is greater than 4 mm and less than or equal to 20 mm.
  • FIG 10 is a schematic diagram of an embodiment of a base used for the tool of the present invention.
  • the base 200 includes a main body 210 and a longitudinal axis 220.
  • the main body 210 rotates around the longitudinal axis 220.
  • the shank portion 211 on the rotating machine is provided with a cutting portion 212 at the other end, which is used for cutting processing.
  • the cutting portion 212 includes a groove body 230 that runs in a helical shape along the radial direction.
  • the blank 100 and the tank 230 are assembled and welded or bonded to obtain a blank for making tools, and then processed on the blank 100
  • a central cutting edge 310 having a rake surface and a flank surface close to the longitudinal axis, and a main cutting edge 320 having a rake surface and a flank surface are formed.
  • the main cutting edge 320 is formed of a continuous and complete superhard material, and has a spiral rake surface (for example, greater than 15°), and the central cutting edge 310 is formed of the same complete superhard material, which traverses the center of rotation.
  • Fig. 12 is a schematic diagram of another embodiment of the cutter of the present invention
  • Fig. 13 is a schematic diagram of another embodiment of the cutter of the present invention.
  • Fig. 4 Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, as shown in Figs.
  • Various types of tools can be processed as required, such as ball-end tools.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

一种坯体，由超硬材料制成，用于固定在基体（200）上，而能被加工成刀具切削刃部（310），其包括第一侧面（100）和第二侧面（120），均以设定的螺旋角发生扭转。将坯体固定于基体后，加工成用于切削主切削刃（320）和中心部切削刃（310），它们位于同一件超硬材料制成的坯体上。还包括一种包括上述坯体的切削刀具。该加工工具在回转中心上具有超硬材料形成的连续且完整的中心部切削刃（310），不仅提高加工的精度和加工效率，还使得中心的强度提高，在实施切削加工中的寿命延长，使得刀具的整体切削性能得到显著提高。

Description

坯体以及具有螺旋状超硬材料前刀面的切削工具 技术领域
本发明涉及一种切削工具，尤其涉及一种具有螺旋状超硬材料前刀面的切削工具。
背景技术
聚晶金刚石(PCD)刀具和立方氮化硼(CBN)刀具为难加工材料的切削难题提供了解决方案。
立方氮化硼(CBN或PCBN)是一种人工合成材料，其硬度仅次于金刚石，具有良好的高温稳定性(在加工淬硬黑色金属和超级合金材料时，会产生很高的温度)。不同设计的CBN刀具被用于对淬硬黑色金属进行连续或断续切削，以及切削加工焊接金属和复合金属。
PCD刀具是将PCD材料焊接于刀体上制成。一般情况下，将PCD材料于基体材料一起在高温高压下利用金属基粘结剂对金刚石颗粒进行烧结而生产出来的。PCD刀尖可通过放电加工或激光进行切割，并焊接到硬质合金或钢基体上，然后通过刃磨形成PCD刀具，这种刀具在高速加工有色金属(如：铝)以及高磨蚀性合成材料和塑料时特别有效。PCD刀具被广泛应用于铣削有色金属、复合材料、塑料以及极其难加工的超级合金。
由于PCD和CBN的特性，一般难以通过常见的磨削方法实施加工，尤其是无法制造完整的螺旋刃刀具，而是使用多件贴片拼接成一条不连续的螺旋刃。
对于钻头和球刀而言，中心刃(又称齿隙或横刃)位于刀具旋转中心，在切削中扮演重要角色，由于中心刃回转半径小，线速度低，前后角角度难以控制，其质量对刀具寿命和加工尤其重要。
螺旋角对刀具切削性能的发挥亦至关重要，大量文献资料表明，具有螺旋角的刀具的切削性能更胜一筹。对于超硬材料刃部的刀具，如何获得具有螺旋角的超硬材料切削刃和超硬材料中心刃部是刀具制造行业不断探索的重点方向。
比如：将超硬材料贴合于旋转中心的两侧，制成贴片刀具，这类刀具采用倾斜贴片的方法，类似于微分学，将弧线分为若干段直线，利用短刃长时(如：刃长不超过10mm)15°以内刃倾角和螺旋角差异小的特点，可以获得不超过15°的近似螺旋角刀刃的刃倾角刀刃。该技术的问题在于，在刃长不变的情况下随着刃倾角加大，或者在刃倾角不变的情况下随着刃长变长，倾斜贴片的方法将不断减弱刀具芯厚，直至刀具完全失去刚性，同时一个刀槽需要安装一枚形成刃的超硬材料贴片，因此不仅无法制作大于15°螺旋或刃倾的角度，也无法将超硬材料用于刀具的中心刃；
为了同时获得理想的由超硬材料构成的中心刃和螺旋主切削刃，另如：材料螺旋 烧结法(英国元素六公司)和整体焊接烧蚀法(瑞士伊瓦格公司)。概括而言，螺旋烧结法就是将未烧结超硬材料的粉料填入预先加工了螺旋状凹槽的毛坯内后再对毛坯和超硬粉料同时烧结以形成螺旋状的超硬刃部毛坯，通过对该烧结毛坯进行加工以生成具有螺旋刃的刀具，该方案的主要缺点是刀具形状受烧结毛坯形状限制，不能任意控制螺旋角参数。整体焊接烧蚀法是将整个超硬材料构成的圆柱形材料整体焊接于刀具先端并对其进行减材加工来直接获得螺旋槽和螺旋刃部，加工一般由激光进行，该方案的主要缺点是需要消耗大量的超硬材料，由此制备成本亦高。
发明内容
本发明的一个目的在于提供一种坯体，将其安装于基体制成刀具，能根据刀具的设计要求，任意控制螺旋角参数。
本发明的另一个目的在于提供一种坯体，减少超硬材料的用量，降低刀具的制造成本。
本发明的再一个目的在于提供一种坯体，将其安装于基体制成刀具，在同一件超硬材料上加工成连续的切削刃，以利于切削加工，改善表面质量。
本发明的又一个目的在于提供一种切削工具，其能具有大于15°螺旋状超硬材料前刀面，便于形成连续的中心部切削刃，以利于切削加工实施，提高刀具的寿命。
本发明的第五个目的在于提供一种切屑工具，其具有连续的超硬材料中心刃和能具有大于15°螺旋角的超硬材料切削刃，提高加工的精度和加工效率，以及提高刀具的寿命。
超硬材料如：金属陶瓷、金刚石(尤其是人造聚晶金刚石)和立方氮化硼，或者硬质合金与金属陶瓷、金刚石和立方氮化硼之一种或几种的形成的复合材料。
切削工具，对物料进行切割的工具，在工业中，也称刀具，如：用于孔加工和成型加工等的钻头、铣刀和铰刀等的总称。
一种坯体，由超硬材料制成，用于固定在基体上，而能被加工成刀具切削刃部，其包括第一侧面和第二侧面，均以设定的螺旋角发生扭转。
一种坯体具体实施方式，其呈板状，厚度大于0.3mm，且小于或等于4mm，长度大于4mm，且小于或等于20mm，宽度大于4mm，且小于等于20mm。
另一种坯体具体实施方式，其呈板状，其厚度大于0.3mm，且小于或等于2mm，长度大于4mm，且小于或等于16mm，宽度小于等于4mm。
将坯体固定于基体后，加工成用于切削的刃部，如：主切削刃和中心部切削刃，位于同一件超硬材料制成的坯体上。
坯体还包括第三面，与第一侧面和第二侧面相交，如：平面、曲面或折面。坯体安装于基体上后，第三面位于沿刀具进给的方向的先端，由同一件超硬材料制成。
采用具有回转轴的机床对超硬材料实施切割，获得本发明的坯体。
为便于刀具的加工，坯体第一螺旋面与第二螺旋面通常平行设置。螺旋面由平面扭转而得，即以相同的角度实施截取，而得到的任意截面面积相等。
一种刀具，包括：
坯体，由超硬材料制成，呈板状，包括第一板面和第二板面，第一板面至少包括第一螺旋面，第一板面至少包括第二螺旋面；
基体，其包括本体和一条纵向轴线，本体绕纵向轴线回转，本体的一端设置为可安装到旋转机械上的柄部，另一端设置加工成切削部，用于实施切削加工，切削部包括一个螺旋状沿径向横亘的槽体。
将坯体与槽体装配(如：焊接或粘接)，之后在坯体上加工形成靠近所述纵向轴线的具有前刀面和后刀面的中心部切削刃，以及具有前刀面和后刀面的主切削刃。
主切削刃部由连续且完整的超硬材料形成，具有螺旋状前刀面(如：大于15°)，中心部切削刃则由同一块完整的超硬材料形成，横亘于回转中心。
本发明技术方案实现的有益效果：
本发明提供的刀具，与现有技术相比，获得了由连续且完整的超硬材料形成的主切削刃，能够制得大于15°螺旋状前刀面，更利于切削加工，比如：显著降低切削力，改善排屑，延长刀具寿命和改善表面质量等。
本发明提供的刀具，在回转中心上具有超硬材料形成的连续且完整中心部切削刃，与现有刀具相比，不仅提高加工的精度和加工效率，还使得中心的强度提高，在实施切削加工中的寿命延长，使得刀具的整体切削性能得到显著提高。
与材料螺旋烧结法相比，本发明的技术方案制取的刀具，其形状不受烧结毛坯形状限制，能根据刀具的设计要求，任意控制螺旋角参数。
与整体焊接烧蚀法相比，本发明的技术方案制取的刀具，可以大大减少超硬材料的使用，而降低了刀具的制造成本。
附图说明
图1为用于本发明坯体一实施例的示意图；
图2为图1所示坯体一角度的示意图；
图3为图1所示坯体另一角度的示意图；
图4为用于本发明坯体另一实施例的示意图；
图5为图4所示坯体一角度的示意图；
图6为图4所示坯体另一角度的示意图；
图7为用于本发明坯体一实施例的示意图；
图8为图7所示坯体一角度的示意图；
图9为图7所示坯体另一角度的示意图；
图10为用于本发明刀具的基体一实施例的示意图；
图11为本发明刀具一实施例的示意图；
图12为本发明刀具另一实施例的示意图；
图13为本发明刀具另一实施例的示意图。
具体实施方式
以下结合附图详细描述本实用新型的技术方案。本实用新型实施例仅用以说明本实用新型的技术方案而非限制，尽管参照较佳实施例对本实用新型进行了详细说明，本领域的普通技术人员应当理解，可以对实用新型的技术方案进行修改或者等同替换，而不脱离本实用新型技术方案的精神和范围，其均应涵盖在本实用新型的权利要求范围中。
图1为用于本发明刀具的坯体一实施例的示意图，图2为图1所示坯体一角度的示意图，图3为图1所示坯体另一角度的示意图。如图1、图2和图3所示，采用具有回转轴的机床对超硬材料实施切割获得坯体100，其整体呈板状，包括第一侧面(或称板面)110和第二侧面(或称板面)120，均以设定的螺旋角发生扭转。具体的，通过转换超硬材料复合片的装夹方式，采用从侧面进刀切割，边切割边旋转复合片的螺旋切割方式来获得具有螺旋状侧面的坯体。
坯体还包括一个平面130，形状为平面，其与第一侧面110和第二侧面120相交。类似的，第三平面130也可采用曲面或折面，如：图4、图5、图6、图7、图8和图9所示，以利于后续在切削刃加工中的应用。本实施例中，板体厚度大于0.3mm，且小于或等于4mm，长度大于4mm，且小于或等于20mm，宽度大于4mm，且小于等于20mm。
图10为用于本发明刀具的基体一实施例的示意图，如图10所示，基体200包括本体210和一条纵向轴线220，本体210绕纵向轴线220回转，本体210的一端设置为可安装到旋转机械上的柄部211，另一端设置加工成切削部212，用于实施切削加工，切削部212包括一个螺旋状沿径向横亘的槽体230。结合图1、图2、图3和图10，如图11所示，将坯体100与槽体230装配并经焊接或粘接固定得到用于制作刀具的坯料，之后在坯体100上加工形成靠近纵向轴线的具有前刀面和后刀面的中心部切削刃310，以及具有前刀面和后刀面的主切削刃320。主切削刃320由连续且完整的超硬材料形成，具有螺旋状前刀面(如：大于15°)，中心部切削刃310则由同一块完整的超硬材料形成，横亘于回转中心。
图12为本发明刀具另一实施例的示意图，图13为本发明刀具另一实施例的示意图。结合图4、图5、图6、图7、图8和图9所示，如图12和图13所示，改变坯体100第三面的形态，如：但不限于曲面或折面，就能按需求加工各型刀具，比如：球头刀具。

Claims (8)

  1. 一种坯体，由超硬材料制成，其特征在于用于固定在基体上，而能被加工成刀具切削刃部，其包括第一侧面和第二侧面，均以设定的螺旋角发生扭转；
    所述的刃部包括主切削刃和中心部切削刃，位于同一件超硬材料制成的坯体上。
  2. 根据权利要求1所述的坯体，其特征在于还包括第三面，与所述的第一侧面和第二侧面相交，处于沿刀具进给的方向的先端，由同一件超硬材料制成。
  3. 根据权利要求2所述的刀具，其特征在于所述的第三面为平面、曲面或折面。
  4. 根据权利要求1所述的刀具，其特征在于所述坯体呈板状，其厚度大于0.3mm，且小于或等于4mm，长度大于4mm，且小于或等于20mm，宽度大于4mm，且小于等于20mm。
  5. 根据权利要求1所述的刀具，其特征在于所述坯体呈板状，其厚度大于0.3mm，且小于或等于2mm，长度大于4mm，且小于或等于16mm，宽度小于等于4mm。
  6. 一种切削工具，其特征在于包括：
    坯体，由超硬材料制成，呈板状，包括第一板面和第二板面，第一板面至少包括第一螺旋面，第一板面至少包括第二螺旋面；
    基体，其包括本体和一条纵向轴线，本体绕纵向轴线回转，本体的一端设置为可安装到旋转机械上的柄部，另一端设置加工成切削部，用于实施切削加工，切削部包括一个螺旋状沿径向横亘的槽体；
    将坯体与槽体装配，之后在坯体上加工形成靠近所述纵向轴线的具有前刀面和后刀面的中心部切削刃，以及具有前刀面和后刀面的主切削刃；
    主切削刃部由连续且完整的超硬材料制成，具有螺旋状前刀面，中心部切削刃部由同一块完整的超硬材料制成，横亘于回转中心。
  7. 根据权利要求6所述的切削工具，其特征在于所述的坯体采用具有回转轴的机床对超硬材料实施切割获得。
  8. 根据权利要求6所述的切削工具，其特征在于所述坯体的第一螺旋面与所述的第二螺旋面通常平行设置，螺旋面由平面扭转所得。
PCT/CN2021/083151 2020-03-30 2021-03-26 坯体以及具有螺旋状超硬材料前刀面的切削工具 WO2021197215A1 (zh)

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