JPH0636885Y2 - Throwaway blade for finishing planes - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of the Invention [0001] The present invention relates to a thrower blade for a plane, which is used for a finishing plane used to finish a pillar or a beam for construction into a smooth plane.

Conventional technology Throwaway blades for finishing planes are, for example,
No. As shown in FIG. 3, the shape of the cutting edge of the cutting tool 1 is such that a step 4 having a substantially L-shaped cross section having a plane parallel to the back surface 3 of the cutting edge is formed in the cutting edge portion 2 to form a rake surface and a chip breaker. .

Problems to be solved by the invention The blade attached to the finishing plane has a force P in the biting direction which is hard against the spring material of the wood to be cut due to different cutting resistance in the summer material or knots or inversion. When operating as shown in FIG. 3, the throwaway blade is a thin plate of about 1.5 mm, and the finishing plane blade has a relatively small blade angle, so the distance 1 from the tip of the base metal 5 of the knife holder to the cutting edge is long. This may cause undesirable vibrations.
There is a problem that this vibration subtly affects the condition of the cut surface of the cutting surface, the life of the blade, and the like. Further, since the holding plate 6 of the knife holder extends to a position closer to the cutting edge and holds the cutting tool, the holding plate 6 may be damaged due to an inappropriate tightening force.
Has a shape in which the blade edge is pushed and bent, and the amount of protrusion of the blade edge from the surface of the blade opening 7 differs each time the blade is replaced, and there is a problem that the protrusion amount must be adjusted each time.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a finishing plane which has rigidity that does not cause vibration during cutting and has a smooth cut surface and a long life. It is intended to provide a throwaway blade for a board.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention is designed so that the intersection line between the inclined surface from the blade surface and the inclined surface with a larger angle from the blade back surface is parallel to the blade surface and is closer to the blade surface. The ridge line formed by the inclined surfaces that are respectively cut so that the side surface that is the rake surface and the inclined surface that is the blade surface side from the inclined surface on the blade rear surface side and the inclined surface on the blade surface side is parallel to the intersection line. And a substantially L-shaped groove cut so as to form a groove.

Action When the throwaway blade of the present invention is attached to the finishing plane and wood is sent on the plane to perform cutting, the cutting waste is bent by the chip breaker and discharged from the gap between the cut edge and the blade 1. Since the inclined surface on the back surface side of the blade has an angle that does not project, cutting chips are discharged smoothly. Even if a force in the P direction is generated due to a difference in hardness or the like, the blade edge is thick and the rigidity is increased and the length of l is small, so that the vibration of the blade edge is suppressed.

Embodiments The present invention will be described below with reference to FIGS. 1 and 2. A long rectangular thin steel plate knife 11 is attached to a knife stock provided on a finishing plane by being held by a base 12 and a presser 13 of a knife holder. The blade 11 has, at the blade edge portion 14, an acute angle α from the blade surface 15 such as the blade surface 15 at about 32 ° in this embodiment.
The inclined surface 16 that intersects with the blade back surface 17 and the inclined surface 18 that intersects the blade back surface 17 at an acute angle β larger than the acute angle α, for example, about 55 ° in the present embodiment, are cut so as to intersect. Inclination angle α
Is determined by the mounting angle of the cutting tool 11 so that the inclined surface 16 serving as a flank forms an appropriate clearance angle with respect to the wood cutting surface of the finishing plane. The length of l is as short as possible so that a sufficient action as a flank is performed. Further, the inclination angle β needs to be a value that does not weaken the rigidity of the cutting edge portion 14 because the gap formed between the inclined surface 18 and the blade opening 24 does not create a protrusion that hinders the flow of cutting chips, and the inclined surface 18 travels in wood. When the target is set to be substantially perpendicular to the surface, it is determined by the mounting angle of the blade 11, and the blade angle is maximized.

As a result of being cut in this way, the line of intersection 19 between the inclined surfaces 16 and 18
Is located at a right angle to the cutting direction of the tool, parallel to the surface of the tool, and close to the surface of the tool. When l is further reduced, the tip of the presser foot 13 is retracted so that the receiving surface does not protrude from the base metal 12 and faces each other.

Further, a groove 20 having a substantially L-shaped cross section is formed in parallel with the intersection line 19 of the inclined surface 18 and the inclined surfaces 16, 18. The groove 20 is cut from the inclined surface 18 over the intersection line 19 to the inclined surface 16, and has a ridge line 21 parallel to the intersection line 19 formed by one side wall of the L-shaped groove 20 and the inclined surface 16. It is used as a cutting edge. The side wall of the L-shaped groove 20 following the cutting edge 21 serves as the rake face 22 and the side wall following the inclined face 18 serves as the chip breaker 23.

Effects The present invention having the above-mentioned configuration has the following effects.

The thickness of the cutting edge increases and the length from the base of the knife holder to the cutting edge can be reduced to about one-third of that of conventional cutting tools. It was possible to suppress the occurrence of vibration, and its value was extremely small, improving the cut surface and prolonging the service life. Also, the tip of the pressing plate was in a state where the holding position from the back of the blade was retracted to the position corresponding to the base metal, but the cutting edge was not bent downward during cutting and the cutting was not possible, and there was no bending of the blade due to holding. If the blade has the same width, the blade tip will always be attached to the same location, which saves the trouble of adjusting the attachment.

[Brief description of drawings]

FIG. 1 is a mounting view of a blade of the present invention, FIG. 2 is an enlarged view of a blade edge, and FIG. 3 is a view showing a conventional blade and mounting. 11 …… Blade, 12 …… Base metal 13 …… Presser foot, 14 …… Blade edge part 15 …… Blade surface, 16,18 …… Inclined surface 17 …… Blade back surface, 19 …… Intersection line 20 …… Groove, 21 …… Cutting edge 22 …… Rake face, 23 …… Chip breaker

Claims (1)

[Scope of utility model registration request] 1. A crossing line (19) between an inclined surface (16) from the blade surface (15) and an inclined surface (18) having a larger angle (β) from the blade back surface (17) is parallel to the blade surface and the blade is Inclined surface cut away from the front and inclined surface on the back side of the blade (18)
To the chip breaker (23) and the side wall to be the rake face (22) and the inclined surface (16) on the blade surface side, the ridgeline is formed so as to form a cutting edge (21) parallel to the intersecting line. A throwaway blade for a finishing plane, comprising a substantially L-shaped groove (20) provided.