JPH059814U - Carbide cone - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the work piece is cemented carbide or other cemented carbide material,
The object is to provide a cone for cemented carbide which has a short processing time and can improve work efficiency. [Structure] A guide portion 2 made of a quadrangular prism-shaped diamond is provided on a shaft 1, a cutting edge portion 3 is formed at a tip end portion of the guide portion 2, and a cutting edge portion 3 of the cutting edge portion 3 is cut at a base end side. The opposite angle of the blade edge is set to 60 ° to 90 °, and the opposite angle of the tip side cutting edge is set to 90 ° to 130 °. Then, when the rotating cutting edge portion 3 is pressed against the workpiece, the cutting edge 4 makes a perfect through hole in the workpiece.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  This invention is mainly for forming a through hole having a circular cross section in a cemented carbide material such as cemented carbide. Concerning the cemented carbide cone.

[0002]

[Prior art]

  The cone used for drilling holes in the workpiece has a cutting edge at the tip of the shaft and the base end of the shaft. Is attached to the head of a boring machine to feed while rotating to make holes However, if the work piece is a cemented carbide material such as a cemented carbide, it is not possible to drill holes with a general cone.

[0003]   The cemented carbide is Fe powder containing carbide powders of Group IVa, Va and VIa metals in the periodic table. It is a composite metal that is sintered and bonded with an iron-based metal such as Co or Ni, and W among 9 types. The C-Co alloy has the best mechanical properties.   This kind of cemented carbide is mainly used for cutting tools, impact resistant tools, etc. However, the drilling process for this cemented carbide had to rely exclusively on electrical discharge machining.

[0004]   Electric discharge machining uses an electrode in the shape of a hole to be machined, and an electric discharge is generated between this and the workpiece. It is a method of shaving and scraping the surface by its action, which is irrelevant to the hardness of the work piece. However, expensive electric discharge machines and other equipment are required.

[0005]   Also known is a drill with a quadrangular pyramid diamond tip on the tip of the shank. This chip has cutting edges on each edge that can be used for drilling, but In the case of hard material, the tip of the quadrangular pyramid tip is broken and cannot be used.

[0006]

[Problems to be solved by the device]

  As mentioned above, if the work piece is cemented carbide or other cemented carbide material, a normal cutting tool I couldn't machine it, so I had to rely on EDM, but EDM has a long machining time. Work efficiency is poor. In addition, electrical discharge machining makes the machined surface rough and often used for finishing. Of time, and expensive equipment such as an electric discharge machine is required.

[0007]   This invention was made by paying attention to the above circumstances, and the purpose is to: Even if the work piece is a cemented carbide material such as cemented carbide, the machining time is short and the work efficiency is improved. In addition to being able to plan, it is suitable for mass production, and the machining surface is smoother than electrical discharge machining, Furthermore, it is to provide a practical cemented carbide cone with a low processing cost.

[0008]

[Means for Solving the Problems]

  In order to achieve the above-mentioned object, the present invention provides a cemented carbide work piece. In a super hard cone for drilling a through hole, a quadrangular prism-shaped diamond is used as the axis. An id part is provided, and the tip of the guide part has a quadrangular pyramid shape, and the opposite ridge angle of the cutting edge is 6 This is because a cutting edge portion having an angle of 0 ° to 90 ° was formed.   According to claim 2, the opposite ridge angle of the cutting edge ridge on the tip side of the cutting edge portion is an obtuse angle of 90 ° to 130 °. It has been formed.

[0009]

[Action]

  According to a first aspect of the present invention, when the rotating cutting edge portion of the cemented carbide cone is pressed against the cemented carbide material to feed it. , The conical hole is bored in the cemented carbide due to the sharp cutting edge of the cutting edge, and the machining progresses further. Then, the conical hole serves as a guide, and a through hole is formed in the cemented carbide material by the cutting blade portion. According to a second aspect of the present invention, when the cutting edge portion of the rotating cemented carbide cone is pressed against the cemented carbide material and is fed, Due to the obtuse tip-side cutting edge of the cutting edge, a conical hole is bored in the cemented carbide material, and further processing is possible. As it progresses, the conical hole serves as a guide and penetrates the cemented carbide by the acute-angled base edge cutting edge. A hole is drilled.

[0010]

【Example】

  Embodiments of the present invention will be described below with reference to the drawings.   1 to 3 show a first embodiment, in which 1 is an axis of a cone for cemented carbide, and this axis 1 Is formed of a cemented carbide such as a WC-Co alloy. At the tip of this shaft 1 Is fixed to a guide portion 2 made of a quadrangular prism single crystal diamond.

[0011]   A quadrangular pyramid-shaped cutting edge portion 3 is formed at the tip of the guide portion 2. This cutting edge The opposite edge angle a of the cutting edge 4 in 3 is formed at an acute angle of 60 ° to 90 °. sand That is, since the cutting edge portion 3 has a quadrangular pyramid shape, as shown in a front view of FIG. Four cutting edge ridges 4 are provided at 90 ° intervals, and the opposite ridge angle, that is, the cutting edge Of the blade edges 4 ... Angles a and 4b formed by opposing cutting edge edges 4a and 4c The angle a formed by d and the d angle is 60 ° to 90 ° as shown in a side view in FIG. Has been.

[0012]   Here, the opposite angle of the cutting edge 4 is set to 60 ° to 90 ° when the angle is 60 ° or less. Then, when processing the cemented carbide, the tip part is easily broken, and the obtuse angle is 90 ° or more. In this case, although the breakage prevention effect is obtained, the sharpness is deteriorated, Have been confirmed by.

[0013]   The guide portion 2 made of the single crystal diamond has an active metal with respect to the shaft 1. It is fixed by the method. This active metal method is based on the activity of mixing titanium in silver wax. It is a method of wetting the guide portion 2 with metal and chemically brazing it to the shaft 1. Generally, brazing and joining at high temperature in vacuum or argon gas atmosphere . In this active metal method, the joint surface shows high strength, and all parts except the joint surface are exposed. Therefore, it is possible to polish the cutting edge as it is, and it is easy to remove chips. There is an advantage.

[0014]   The spindle 1 of the cemented carbide cone thus configured is mounted on the head of the boring machine, It is rotated at 600 to 1200 rpm, and the cutting edge portion 3 is made of cemented carbide such as cemented carbide which is a workpiece. When pressed against the material 5, as shown in FIG. 6 is drilled.

[0015]   4 and 5 show the second embodiment, in which the base edge side cutting edge ridge 7 of the cutting edge portion 3 ... The opposite ridge angle c is formed at an acute angle of 60 ° to 90 °, and the tip side cutting edge ridge 8 thereof is formed. The opposite ridge angle d of ... Is formed at an obtuse angle of 90 ° to 130 °.

[0016]   Here, since the cutting edge part 3 has a quadrangular pyramid shape, As shown in the front view of FIG. 5, four base end side cutting edge ridges 7 ... Are provided at 90 ° intervals. And the opposite ridge angle, that is, the cutting edge ridges facing each other among the base end side cutting edge ridges 7 ... The angle c formed by 7a and 7c and the angle c formed by 7b and 7d are shown in FIG. As shown, it is formed at an acute angle of 60 ° to 90 °.

[0017]   Similarly, since the cutting edge 3 has a quadrangular pyramid shape, As shown in the front view of FIG. 5, the cutting edge ridges 8 ... The main ridge is formed, and its opposite ridge angle, that is, the opposite of the apex side cutting edge ridges 8 ... The angle d formed by the cutting edge 8a and 8c and the angle d formed by 8b and 8d are as shown in FIG. As shown in a side view, it is formed at an obtuse angle of 90 ° to 130 °.

[0018]   Here, the opposite ridge angle of the tip side cutting edge ridge 8 is set to 90 ° to 130 ° is 90 ° If the temperature is less than the following, the tip portion is easily broken when processing the cemented carbide, and it is more than 130 °. This is because the sharp obtuse angle has the effect of preventing breakage, but the sharpness decreases. It is confirmed by the experiment of the planner.

[0019]   At this time, since the apex side cutting edge ridge 8 of the cutting edge portion 3 is formed with an obtuse opposite angle, An obtuse-angled conical hole is bored in the cemented carbide material 5, and when further processing proceeds, the obtuse-angled conical shape The tip side cutting edge ridge 8 located in the hole functions as a guide, and the opposite ridge angle is an acute angle on the base end side. A straight circular through hole 6 is formed by the cutting edge 7.

[0020]   In addition, in the above-mentioned one embodiment, when a through hole is formed in a cemented carbide material such as cemented carbide. However, it is a pity that it can be drilled in general steel materials. Also The diamonds forming the guide portion 2 and the cutting edge portion 3 may be artificial diamonds. Yes.

[0021]

[Effect of device]

  As described above, according to the present invention, the first aspect of the present invention is that the shaft has a quadrangular prism shape. A guide part made of crystal diamond is provided, and the tip of this guide part has a quadrangular pyramid shape. The cutting edge is formed with the opposite edge angle of the cutting edge being 60 ° to 90 °.   Therefore, when pressing the rotating cutting edge of the cemented carbide cone against the cemented carbide material, the sharpness of the cutting edge is sharpened. Through-holes can be drilled in cemented carbide due to the corner cutting edge, and the workpiece is cemented carbide Even if it is a super hard material, the processing time is short and the work efficiency can be improved. Therefore, it is suitable for mass production, the machining surface is smoother than electrical discharge machining, and the machining cost is lower. This has the effect of providing a practical cone.   According to a second aspect of the present invention, the opposite ridge angle of the tip portion of the cutting edge portion is formed as an obtuse angle of 90 ° to 130 ° Therefore, first, an obtuse-angled conical hole is bored in the cemented carbide material, and when the processing progresses further, The cutting edge on the tip side located in the conical hole functions as a guide and the cutting edge with an acute angle Through holes can be easily formed in the super hard material.

[Brief description of drawings]

FIG. 1 is a side view of a cemented carbide cone according to a first embodiment of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is an explanatory view of a processed state of the embodiment.

FIG. 4 is a side view of a cemented carbide cone according to a second embodiment of the present invention.

FIG. 5 is a front view of the embodiment.

[Explanation of symbols]

1 ... Shaft, 2 ... Guide part, 3 ... Cutting edge, 7 ...
..Base side cutting edge ridges, 8 ... Tip side cutting edge ridges.

Claims (2)

[Scope of utility model registration request] 1. In a cemented carbide cone for forming a through hole in a cemented carbide work piece, a guide portion made of quadrangular prism-shaped diamond is provided on a shaft, and a quadrangular pyramid shape is provided at a tip portion of the guide portion. A cone for cemented carbide, which is characterized in that a cutting edge portion is formed with the opposite edge angle of the cutting edge being 60 ° to 90 °. 2. The base-side opposing ridge angle of the cutting edge portion is 60 ° to 90 °.
2. The cone for cemented carbide according to claim 1, wherein the sharp angle is set to an acute angle of 90 ° to 130 °.