JP3055038U - Drilling equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a hole drilling device that effectively discharges chips and performs machining smoothly. A shaft rod and a cutter are included. The cutter 20 has a cylindrical shape, an open end is fixed to the shaft 10, and a certain number of saw teeth 24 are provided at the open end. The top end of the shaft 10 is higher than the horizontal plane where the saw teeth 24 are located, and a drill 18 is provided, and the bottom end of the shaft 10 is provided with a mounting shank 16 used for connection with a rotary tool. A dust discharge groove 30 is provided between the two saw teeth 24 of the cutter 20,
Each waste discharge groove 30 is located on the outer peripheral surface 26 of the cutter 20,
Further, each of the saw teeth 24 extends downward from the base 28. With these, chips generated by the cutter 20 during cutting are:
The waste is discharged to the outside along the waste discharge groove 30.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a cutting tool, and more particularly, to a hole drilling device capable of improving cutting efficiency.

[0002]

[Prior art]

 When drilling a round hole on a workpiece such as wood or metal plate, it is usually done using a hole drilling machine. As shown in FIG. 1, a conventional drilling machine usually has a shaft 1 having a drill at a top end and a mounting shank 3 at a bottom end. The cutter 4 is fixedly attached to a shaft rod, and a large number of saw teeth 5 are provided on the periphery of the cutter. In use, the mounting shank 3 is attached to an electric or pneumatic rotary tool, and the drill 2 is used to make a hole in a workpiece. When the rotating tool rotates the hole drilling device, the drill 2 cuts or cuts through the center of the point to be drilled, and a fixed position effect occurs. When the cutter 4 hits the workpiece, The saw tooth 5 cuts a round hole by the driving force of the rotary tool.

[0003]

[Problems to be solved by the invention]

 The major disadvantage of the above-mentioned conventional drilling machine is that chips generated when the cutter is performing cutting accumulate in the gap 6 between the two saw teeth 5 and between the cutter and the workpiece. When the waste is filled in the space, the periphery of the cutting cutter becomes the same as a flat surface, in other words, the cutting edge of each saw tooth loses the cutting function, and the cutting speed is reduced. In such a situation, the operator stops the rotating tool, cleans the chips, and then starts the rotating tool again, which is not only inconvenient, but also reduces the efficiency of work. Furthermore, at the time of cutting, frictional heat is generated between the cutter 4 and the workpiece, and the chips are accumulated on the contact surface, making it difficult to discharge, and the accumulated heat burns the wooden workpiece and burns it. Sometimes. In addition, since the chip speed is reduced because the chip is not discharged in time, burrs are generated in the cut hole, that is, the edge of the hole is not flat, so that the friction between the cutter and the workpiece is large. The cutting efficiency is further reduced.

[0004] Accordingly, an object of the present invention is to provide a hole drilling device capable of effectively discharging chips and performing machining smoothly.

[0005]

[Means for Solving the Problems]

 The drilling device provided by the present invention includes a shaft rod and a cutter. The cutter has a cylindrical shape, and the center of the open end of the cutter is fixed to a shaft bar, and a predetermined number of saw teeth are provided at the open end edge. The top end of the shaft is provided with a drill higher than the saw tooth, and the bottom end of the shaft is provided with a mounting shank used for connection with a rotary tool. Characteristically, a chip discharge groove is provided between the saw teeth of the cutter, and each chip discharge groove is located on the outer peripheral surface of the cutter and extends downward from the tooth base of each saw tooth. As a result, the chips generated by the cutter during cutting are discharged to the outside along the chip discharge grooves, and do not cause the above-described disadvantages of the conventional hole drilling device.

[0006]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Referring to FIGS. 2 to 5, the drilling apparatus of the present embodiment includes a shaft 10 and a cutter 20 fixedly connected to the shaft. The shaft 10 has a hexagonal or circular column 12 located at the center, a screw column 14 extends upward from the top surface of the column 12, and a mounting shank 16 extends from the bottom surface of the column 12. It extends, and a drill 18 having a small outer diameter is provided at the top end of the screw portion 14.

The cutter 20 has a cylindrical shape, and has a screw hole 22 at the center of the bottom for screwing the cutter 20 itself to the screw portion 14 of the shaft rod 10, and the periphery of the screw hole 22 has a predetermined constant. Serrations 24 are provided and the design height is such that when cutter 20 is screwed onto shaft 10, drill 18 is higher than the upper periphery of cutter 20. As a feature of the present embodiment, a dust discharge groove 30 is provided between each pair of adjacent saw teeth 24, and each waste discharge groove 30 is located on the outer peripheral surface 26 of the cutter 20, and the tooth of the saw tooth 24 is formed. Each waste discharge groove 30 extends downward from the base 28 by an appropriate length, and is inclined in the axial direction of the shaft 10 by a predetermined angle.

In this embodiment, the elastic member is a coil spring 40, which is attached to the drill 18, and one end of which is adapted to hit the top surface of the threaded portion 14. Hereinafter, the use of the above-described hole drilling device will be described in detail. If a hole is to be drilled on the workpiece with the drilling device, the mounting shank 16 is first mounted on the electric rotary tool, and the drill 18 is directed to the center of the workpiece to be cut, and then the rotary tool is started. Initially, the drill 18 pierces the workpiece to achieve a positioning effect and an effect to keep the cutting point from moving, and cutting begins when each saw tooth 24 of the cutter 20 contacts the workpiece. Since the cutter 20 is provided with the chip discharge groove 30, chips generated during cutting are discharged to the outside along each chip discharge groove 30, and the gap between the two saw teeth 24 and the workpiece 20 and the cutter 20 are removed. There is no accumulation during. In addition, as the cutter 20 cuts deeper, the workpiece between the cutter 20 and the drill 18 becomes increasingly closer to the coil spring 40, in other words, the coil spring 40 is compressed and accumulates energy. When the cutter 20 penetrates the workpiece after the cutting, the external force that presses the coil spring 40 disappears, so that the coil spring 40 emits energy, and the force between the cutter 20 and the drill 18 is reduced. The cutting waste material, that is, the cut workpiece is pushed out and does not remain in the cutter 20.

In the present embodiment, since the scrap discharging speed is high, good contact can be maintained between the saw tooth 24 of the cutter and the workpiece, and the cutting efficiency can be maintained. Also, since the chips do not accumulate between the workpiece and the saw teeth 24, the heat generated from the friction is radiated to the outside and does not scorch. In addition, the cutting speed is high due to the high dust removal speed, the cut holes have no burrs, in other words, the shape of the holes is beautiful, and there is no friction with the cutter.

[Brief description of the drawings]

FIG. 1 is a three-dimensional view showing a conventional hole drilling device.

FIG. 2 is a combined perspective view showing the hole drilling device according to the embodiment of the present invention;

FIG. 3 is an exploded perspective view showing the hole drilling apparatus according to the embodiment of the present invention;

FIG. 4 is a side view showing the hole drilling apparatus according to the embodiment of the present invention;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Shaft 16 Mounting shank 18 Drill 20 Cutter 24 Saw tooth 28 Tooth base 30 Debris discharge groove

Claims (2)

[Utility model registration claims] 1. A cutter comprising: a cutter; and a shaft, wherein the cutter has a cylindrical shape and has an open end, a center of the open end is fixed to the shaft, and a tooth is provided on an edge of the open end. A plurality of saw blades having a base are provided; the shaft is provided with a drill higher than the saw blade at a top end; and a mounting shank provided for mounting with a rotating tool at a bottom end, the plurality of saw blades being provided. A chip discharge groove is formed between the chips, and the chip discharge groove is located on the outer peripheral surface of the cutter and extends downward from the tooth base. A hole drilling device, which is discharged along a pipe. 2. The hole drilling device according to claim 1, wherein the waste discharging groove is inclined in an axial direction of the shaft rod by a predetermined angle.