JP3136786U - Wood drilling tools - Google Patents

Abstract

The present invention provides a drilling tool that opens a straight through-hole without blurring the drilling direction.
By attaching a scribing blade protruding at the tip of a triangular cutting blade, it is possible to perform a drilling operation in which the bending moment is suppressed to determine the advancing direction of the drilling tool and to penetrate in the set central axis direction. Since the drilling tools are arranged at both ends of the drilling machine frame and cut from both directions, the vibration to the workpiece is suppressed and the working time is shortened. Further, the cutting shaft of the drilling tool is made into a pipe-like hollow, compressed air is sent into the shaft, and the cut wood chips are forcibly discharged from the guide groove by ejecting at the cutting portion at the end of the shaft, so that high speed operation is possible.
[Selection] Figure 6

Description

  The present invention relates to a drilling tool for performing a work of opening a through hole straight in the longitudinal direction and a deep hole up to the middle of a columnar wood end.

  There are two types of existing drilling tools: a drill type used for drilling metal or plastic, and a cone type dedicated to wood.

  The drill-type drilling tool starts cutting by pressurizing the drill against the wood. Since the tip of the punch is not a dot but a flat line, the direction of the drilling tool is not fixed and it is easy to proceed to the early part, which is a soft part of the workpiece. Therefore, it deviates from the set center axis and causes a deflection phenomenon that deflects, resulting in generation of defective products and breakage of the blade edge.

  In the cone-type drilling tool, a screwed guide at the center of the shaft leads the tip of the cone, and the wood is cut by a cutting blade arranged on the circumference for drilling. When the drilling direction is perpendicular to the annual ring, the resistance to the cone tip received from the workpiece is almost constant, so the cutting blade goes straight. However, when drilling in an oblique direction with respect to the annual ring, the resistance received by the cutting blade varies depending on the circumferential position to be cut first and the circumferential position to be cut later. The occurrence of a bending moment due to the difference in cutting resistance causes a blurring phenomenon that deviates from the set center axis.

  With existing drilling tools, the cutting edge may break during operation due to the physical properties of the cutting edge shape.

  In the existing drilling tool, the traveling direction may be fluctuated due to the generation of a bending moment due to a change in the resistance of the workpiece, and the set central axis may be deviated.

  With existing drilling tools, it takes about 1 minute to drill in the longitudinal direction of a 1 m long wood.

  Wood chips cut by the existing drilling tool are pushed out by the new wood chips in the guide groove and discharged naturally. When the operation speed is increased, the shape of the wood chips is increased, the amount of drilling is increased, the frictional resistance between the guide groove and the wood is increased, and the operation is hindered.

  An object of the present invention is to solve the problem of the conventional configuration, and an object of the present invention is to realize a drilling tool that does not shake the drilling direction and opens a straight through hole.

  The inventor of the present invention has focused on solving the problem of reducing blurring, which is a drawback of existing drilling tools, by attaching a scribing blade to the tip of a triangular cutting blade.

  As described, the present invention is a drilling tool capable of opening a through-hole as set by a scribing blade attached to the tip of a triangular cutting blade. In addition, the long workpiece which drills a deep hole can be utilized for various purposes besides reinforcing or connecting through a metal core in the longitudinal direction, for example.

  The perforation size can be changed by increasing or decreasing the width of the triangular blade.

  A semicircular blade can also be used as a modification of the triangular blade.

  Since the cut wood chips are forcibly discharged from the guide groove by the compressed air that has passed through the inside of the cutting shaft, high-speed operation is possible.

  Since drilling is performed from both ends of the workpiece, vibration of the workpiece is suppressed, and the working time is shortened.

  Embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the drilling tool is provided with a triangular cutting blade 2 provided at the tip of the cutting shaft 1 and a marking blade 3 protruding from the tip portion.

  By using a scribing blade, a through hole with a diameter of less than 3 cm is drilled in about 12 seconds on the set center axis of a workpiece with a length of 1.2 m. The working speed is about 5 times faster than that with existing drilling tools.

  Even when drilling in an oblique direction with respect to the central axis direction of the longitudinal direction of the wood, the scribing blade cuts and cuts the fibers 4 of the main material as shown in FIG. The bite is good. Moreover, since the diameter of the scribing blade is small, a large bending moment like a cone type does not occur.

  Since the protruding marking blade leads straight toward the set center axis of the workpiece, the cutting blade can be opened to the set center axis according to its width without causing shaking. .

  As shown in FIG. 5, by sending compressed air into the cutting shaft 1, wood chips are forcibly discharged from the guide groove regardless of the slow operation speed, the length of the workpiece, etc., and high speed operation is possible. It is a punch.

  As shown in FIG. 1, the lower part of the cutting blade is scraped off in a half-moon shape so that the compressed air is diffused and the wood chips are more effectively discharged from the guide groove.

  Furthermore, as shown in FIG. 6, by drilling from both ends of the drilling machine frame, the working time is shortened, and the stable operation can be performed while suppressing the vibration of the workpiece.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG.

  In the figure, the wood fixing device 6 is arranged at the center position in the length direction of the punching machine frame 5, and one unit is provided at each of the left and right ends of the punching machine frame, and the drilling is performed on the set central axis while keeping the horizontal direction toward the wood fixing device. The headstocks 7 and 8 are arranged. The perforator frame is provided with guide rails 9 in the length direction, and the two headstocks are supported on the guide rails by linear bearings 10 attached to the bases thereof, and can freely slide in the length direction.

  A three-claw chuck 11 is attached to the headstock, and the punching tool is detachable from the three-claw chuck 11. The three-jaw chuck 11 is rotationally driven from a motor 12 by belt transmission.

  A nut 13 is fixed to the lower part of the headstock and is screwed with a feed screw 14 fixed to the main body frame. Driving force is transmitted to the feed screw from the motor 15 by belt transmission. The feed screw 14 is rotated by the rotation of the motor 15, and the headstock 7 supported on the guide rail moves accordingly.

  In the illustrated embodiment, four vices 16 are provided in the wood fixing device 6 in order to fix the workpiece at a plurality of positions. The four vices are operated by air pressure, and the drilled wood is chucked and fixed to the work table. The drilling tool attached to the headstock 7 by the three-claw chuck 11 is advanced forward by driving the motor 15 and performs a drilling operation with a time difference from both ends of the workpiece.

  The three-claw chuck 11 is provided with a pipe through which air passes, and compressed air is sent from the end of the three-claw chuck 11. A drilling tool is attached to the three-jaw chuck 11 and blows air into a hollow pipe-shaped cutting shaft. Regardless of whether the operation speed is slow or the work material is long or short, the cut wood waste is discharged from the guide groove by this air blow. The structure of the left and right punches and their attached equipment are exactly the same.

It is the front view which showed one Example of this invention punch. It is the elevation which showed one Example of this invention punch. It is the side view which showed one Example of this invention punch. It is an enlarged view of the marking blade part which protrudes in the front-end | tip part of the cutting blade of this invention punch. It is the principal part cross-sectional front view which showed the state which attached the drilling device of this invention to the punching machine flame | frame, and pierced wood and the flow of compressed air. It is a principal part cross-sectional front view of the punching machine which attached this invention punching tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting shaft 2 Cutting blade 3 Marking blade 4 Wood fiber 5 Punching machine frame 6 Wood fixing device 7 Left headstock 8 Right headstock 9 Guide rail 10 Linear bearing 11 Three-claw chuck 12 Motor 13 Nut 14 Feed screw 15 Motor 16 Vise

Claims (1)

  A wood drilling tool having a triangular cutting blade with a scribing blade protruding at the tip of a hollow pipe-shaped cutting shaft and having a device for sending compressed air to the inside of the cutting shaft.

Images