JPH0659607B2 - Cutting edge super finishing method - Google Patents

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for superfinishing a blade edge of a blade that has been rough-ground when grinding various long blades such as veneer lace and veneer slicer. "Conventional Technology" The super-finishing of the above cutting edge is done by hand grinding with a flat grindstone.
There has been attempted a method of superfinishing by pressing the rotary grindstone against the blade tip surface by utilizing the elastic force and fluid pressure of a spring and reciprocating the rotary grindstone in the longitudinal direction of the blade. [Problems to be Solved by the Invention] However, in the conventional method, when the elastic force of the spring is used, the rotary grindstone may bounce finely in the longitudinal direction of the cutting edge surface to damage the cutting edge. It is highly likely.
It is possible to eliminate that possibility by using fluid pressure, but in the process of reciprocating in the longitudinal direction of the tool while the wheel is pressed against the blade edge surface by fluid pressure, the wheel passes through the edge of the tool. In addition, when returning to the end of the blade again by reverse operation after passing the end, excessive grinding causes the edge of the blade to drip, or the rotating grindstone collides with the edge of the blade when reversed. There was fear. "Means for Solving the Problem" The present invention is a blade edge superfinishing method for preventing the blade edge drooping of the blade edge, and a collision between a rotary grindstone and the blade edge, and the configuration thereof is a blade anchorage. With respect to the fixed sharpened blade, the rotating grindstone is moved forward and backward, and the sliding member that is urged toward the blade by fluid pressure is advanced, and the rotating grindstone is pressed against the cutting edge against the fluid pressure. When the distance that the rotary grindstone retreats relative to the sliding member reaches the grinding amount, the advance of the sliding member is stopped to set the grinding amount, the fluid pressure is temporarily released, and the rotary grindstone is cut. After moving to the standby position that has passed the longitudinal end, the rotary grindstone is rotated to reciprocate in the longitudinal direction of the blade, and when the rotary grindstone is reciprocated, the rotary grindstone from the standby position moves the blade Applying fluid pressure when reaching the longitudinal end With the start, when the rotary grindstone reaches at least one of the ends of the blade, until the reverse operation is completed from the arrival thereof, the fluid pressure is temporarily released to separate the rotary grindstone from the cutting edge surface. It is in. Here, the completion of the reverse operation means that the rotary grindstone is located at the end portion of the blade and is in a movement posture in the reverse direction.

【Example】

Hereinafter, an example in which the method according to the present invention is carried out in an apparatus dedicated to cutting edge superfinishing will be described with reference to the accompanying drawings. Reference numeral 4 denotes a blade fastening base for pressing and holding the blade 1 by the blade retainer 3 on one side of the bed 2 having at least the length of the blade 1 to be ground. A traveling body 6 supported by rollers 5 at its four corners is mounted on upper portions of both sides of the bed 2, and a pulley 8 of a prime mover 7 attached to a lower portion of one side of the traveling body 6 and a shaft below the pulley 8 are mounted on the traveling body 6. A belt 10 is suspended between supported pulleys 9, and a chain wheel 11 fitted to the other end of the pulley 9 is tensioned by springs (not shown) at both longitudinal ends of the bed 2. By engaging the chain 12 held in the installed state,
The traveling body 6 is reciprocally movable. At the time of this meshing, as shown in FIG. 4, a pair of auxiliary chain wheels 13 are supported on both sides close to the chain wheel 11 and meshed with the chain 12, so that vibration of the chain wheel 11 at the time of meshing rotation. Is being prevented. In the traveling body 6, even if the bases 14 and 15 and the rotary grindstones 36 and 36 for the front and back of the blade are opposed to each other with respect to the blade 1 fixed to the blade mounting base 4, In order not to interfere with each other, the blades 1 are attached separately from each other with a phase shift in the longitudinal direction. In this embodiment, since the blade 1 is pressed and fixed with the blade table 16 portion as the lower surface, the lower base 15 is paired with a pair of supports arranged on both sides thereof so as to follow the inclined surface of the blade table 16. A guide rod 19 which is pivotally supported by a plate 17 in an inclined manner and which projects from the lower base 15 is inserted into the lower opening 18 of the one support plate 17, and the other end of the guide rod 19 is attached to the screw shaft 20. The lower base 15 is engaged by the screwing of the screw shaft 20.
You can adjust the inclination of the. A prime mover 21 is arranged on one side of each of the pair of upper and lower bases 14 and 15, and a pulley 22 of the prime mover 21 and
A belt 26 is suspended around a pulley 25 that is axially slidable with respect to a rotary shaft 24 that is supported between a pair of bearings 23. In addition, guide plates 27 are installed at regular intervals at substantially central portions of the bases 14 and 15, and sliding bodies 28 that are movable back and forth toward the cutting edge of the blade 1 are provided between the guide plates 27. The sliding member 30 is mounted on the sliding guide 29 installed in the sliding body 28 after being engaged. In the illustrated example, an annular sliding member 30 formed by inserting and supporting the rotary shaft 24 is supported on a sliding guide 29 employing a linear way, and a regulating plate 31 is installed on the rear portion of the sliding member 30. There is. A bearing 33 that supports the feed shaft 32 is installed on the other side of the pair of upper and lower bases 14 and 15.
Is screwed into an arm 34 protruding from one side of the sliding body 28. Further, the dial indicator 35 is attached to the sliding body 28, and the tip of the spindle is brought into contact with the regulating plate 31, so that the sliding amount of the sliding body 28, that is, the tip of the rotary shaft 24 is fitted. The amount of grinding of the blade 1 by the rotary grindstone 36 is set. Incidentally, this grinding amount setting device 37, in this embodiment,
Although the handle 38 fitted to the base end of the feed shaft 32 is manually rotated and set based on the instruction scale of the dial indicator 35, for example, the drive from the prime mover is transmitted to the feed shaft 32, while the dial The indicator 35 may be an indicator with contacts, and may be a mechanism that automatically stops the screwing of the feed shaft 32 when a preset grinding amount is reached. The blade surface grinding mechanism and the blade back grinding mechanism thus configured are arranged so that the rotary grindstones 36, 36 face each other with respect to the blade 1. A fluid pressure cylinder 39 is attached to the other end of the sliding body 28, and the tip of a rod 40 of the sliding body 28 is connected to the regulating plate 31 to urge the sliding member 30 toward the blade.
Further, the bases 14 and 15 are provided with a limit switch as a detection mechanism or a detector 4 such as a photoelectric tube as shown in the drawing.
1 is attached. At this time, the respective parts arranged on the bases 14 and 15 are
Similar effects can be obtained even with the parts and the arrangement relationship as in the embodiment shown in FIGS. That is, as in the above-described embodiment, the bracket 4 attached to the rack member 44 that slides in the blade edge direction as the motor 43 is driven along the guide plates 27 installed on the bases 14 and 15.
5, a sliding member 30 formed by supporting the rotary shaft 24 of the rotary grindstone 36 through the sliding body 28 as in the above embodiment is mounted on the bases 14 and 15 as a pair of bearings. The rotary shaft 24 is axially slidably supported between 23, and more specifically, the fluid cylinder 39 is attached to the upper end of the bracket 45 fitted to the tip of the rack member 44. The tip of the piston rod 40 is brought into contact with the regulation plate 31. The same parts as those in the above embodiment are designated by the same reference numerals and will not be described again. Reference numeral 46 in the drawing denotes a cooling water gutter provided between the bed 2 and the blade fastening base 4 over the entire length of the range in which the rotary grindstone 36 moves. FIG. 8 shows the tool 1 after rough grinding, in which the main blade surface is ground by an existing knife grinder for rough grinding, and the grinding surface of the blade table 16 and the back surface of the blade is rough, A burr 43 is generated toward the. By superfinishing this rough ground surface, a blade with a smooth surface 48 as shown in Fig. 9 can be obtained, and if a two-step grinding is performed during superfinishing, the blade with a chain double-dashed line can be obtained. 49 is obtained. Next, the operation will be described. First, in the plywood or woodworking factory, the main blade surface of the blade 1 is roughly ground by an existing separately provided knife grinder for rough grinding. After that, the blade 1 having the main blade surface rough-ground is placed on the blade mounting base 4 with the blade table 16 portion as the lower surface, and is pressed and fixed by the blade presser 3. Then, in order to adjust the grinding angle of the blade surface 16 portion by the rotary grindstone 36 of the blade surface grinding mechanism, the lock nut is once loosened and the screw shaft 20 is appropriately screwed to determine the inclination angle of the lower base 15. Then loosen and fix the lock nut again. After the angle is determined, the traveling body 6 is moved by driving the prime mover 7 so that the rotary grindstone 36 reaches the surface of the blade 1. Running body 6
The fluid pressure cylinder 39 is actuated when the blade reaches the blade 1, and fluid pressure is supplied from each port to extend the rod 40 so that the pressure in the rear cylinder chamber becomes higher than that in the front cylinder chamber. When the feed shaft 32 is screw-rotated while the regulating plate 31 is always pressed forward, the sliding body 28 advances together with the sliding member 30 while being guided by the guide plate 27, and the rotary grindstone 36 causes the cutting edge of the cutting tool 1 to move. The sliding body 28 stops at that position when it comes into contact with the surface, and only the sliding member 30 begins to retract. That is, even if the rotary grindstone 36 comes into contact with the edge surface of the blade 1,
Since the feed shaft 32 is still rotating by screwing, the sliding member 30 has an action of retreating together with the sliding body 28, and the sliding member 30 pushed forward by the rod 40 of the fluid pressure cylinder 39 is moved. , Will be relatively retracted against the fluid pressure. This amount of retreat is the amount of grinding of the blade 48 at the blade edge portion, and the screw rotation of the feed shaft 32 is stopped at the time when the dial indicator 35 indicates the initial scale or when preset. . At this time, according to the embodiment shown in FIG. 6 to FIG. 7, when the rack member 44 is moved forward along the bearing 42, the piston rod 40 of the fluid cylinder 39 attached to the bracket 45 causes the restriction plate 31 to move. The rotary shaft 24 is slid in the axial direction via the, and the rotary grindstone 36 is brought into contact with the blade tip surface of the blade 1.
After that, the rotary shaft 24 receives a moment to retreat from the current position, but like the above-described embodiment, the fluid cylinder 39
Since the rotary shaft 24 is constantly pushed forward by the piston rod 40 of No. 3, the rotary grindstone 36 comes into contact with the cutting edge surface. The amount by which the rotary shaft 24 retreats against the fluid pressure that pushes the rotary shaft 24 forward is set as the grinding amount for the blade 48 with respect to the blade tip portion, and when the dial indicator 35 indicates the desired scale or preset. The forward movement of the rack member 44 is stopped at the time set by. At the time of setting the grinding amount, in principle, the fluid is removed from the rear cylinder chamber of the fluid cylinder 39 to bring the piston rod 40 to the contraction limit, and the prime mover 7 allows the traveling body 6 to pass through the longitudinal end of the blade. After moving to the standby position, the prime mover 21 is driven to give rotation to the rotary grindstone 36. Next, when the prime mover 7 is driven to rotate the chain wheel 11, the chain wheel 11 is sandwiched by the auxiliary chain wheels 13 on both sides of the chain wheel 11 and the amount of suspension with respect to the chain 12 is increased, so that the chain wheel 11 is transferred to the chain link. The slip of time is prevented, and the traveling body 6 smoothly moves forward. When the traveling body 6 reaches one end in the longitudinal direction of the blade 1 during the forward movement, and the detector 41 attached to the bases 14 and 15 detects this, the fluid is supplied to the rear chamber of the fluid cylinder 39.
Then, when the traveling body 6 reaches the other end of the blade 1 in the longitudinal direction, the prime mover 7 is reversely driven through an appropriate timing device such as a timer, and the fluid is supplied to the rear chamber of the fluid cylinder 39. Stop until the return of 6 starts,
From the time when the rotary grindstone passes the end of the blade to the time when it returns to the end of the blade again by the reverse operation, the fluid pressure is temporarily released to retract the rotary grindstone from the tip surface. In this way, if the traveling body 6 is reciprocated a plurality of times so that the blade edge portion of the blade 1 does not burn, the blade 1 will have the superfinished blades 48, 49 as shown in FIG. Obtainable. Then, the reciprocating movement of the traveling body 6 can be stopped at any time within the range of the grinding amount set by the grinding amount setting device, when it is determined that the grinding is completed. In the embodiment, the rotary grindstone is retracted from the cutting edge surface in the reverse drive from the forward movement to the backward movement, but in the reverse drive from the backward movement to the forward movement, or in any case, the rotary grindstone is moved to the cutting edge. It can also be retracted from the surface. Since the device shown in this embodiment is exclusively for superfinishing, it is possible to perform superfinishing in parallel with rough grinding, and compared with the existing superfinishing method using a knife grinder, In addition, it is possible to shorten one cycle of the entire grinding process including superfinishing. In particular, for blades that bite iron pieces, gravel, etc. during cutting of raw wood and have a large chip in the cutting edge portion, it will take a longer time than ordinary rough grinding, but during this time, the blade that has already been rough ground To
Superfinishing can be done in parallel with rough grinding, which greatly improves workability. In the present embodiment, a pair of rotating grindstones 36 are vertically arranged relative to the blade 1 in order to simultaneously grind the blade surface 16 portion and the blade back portion of the blade 1 pressed and fixed in the horizontal state. In the case of pressing and fixing the cutting tool 1 in a vertical state, the bases 14 and 15 on which the rotary grindstone 36 facing the cutting tool 1 is placed are paired with the traveling body 6 in a left-right pair. And, the arrangement of the rotary whetstones 36, 36 is such that the front surface is the blade surface,
The bases 14 and 15 are not separately arranged in the upper part and the lower part of the tool to contact the back of the blade, but the bases 14 and 15 are contacted with the tool so that the back side surface contacts the rotary grindstone 36 on one side. They can be placed on the same side. Further, in order to grind the blade surface 16 portion and the blade back portion of the blade 1 at the same time, the rotary grindstones 36, 3 are provided on the front surface and the back surface of the blade 1.
In addition to the one which 6 contacts, the rotary grindstone 36 for grinding the back of the blade may be omitted so as to be dedicated to the surface grinding of the blade, or conversely, a grindstone for rough grinding may be added. Further, if the detector 41 can detect that the traveling body 6 has reached at least one end of the blade 1 in the longitudinal direction, the base 1
Other than 4, 15, it is also possible to attach to, for example, a traveling body, and the detection mechanism can be appropriately changed by using an encoder provided on a motor other than the detector.

【effect】

As described above, according to the present invention, the grinding amount can be easily set,
Until the set grinding amount is ground, the rotary whetstone is urged by the fluid pressure against the cutting edge surface to reciprocate any number of times, so even if the cutting tool is finely deformed or uneven in the longitudinal direction, Even if it has it, in addition to the effect that the blade can be uniformly attached within the range of the grinding amount once set, when the rotating grindstone reaches at least one of the ends of the blade, the reverse operation is completed from that time Until it is released, the fluid pressure is temporarily released and the rotary grindstone is separated from the blade edge surface, so that the blade droop can be eliminated and the problem that the rotary grindstone collides with the edge of the blade when reversed To be done.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG.
Fig. 3 is a view taken along the line A-A of Fig. 3, Fig. 3 is a view taken along the line BB of Fig. 1, Fig. 4 is a view taken along the line C-C of Fig. 1, and Fig. 5 is shown in Fig. 3. D-D line arrow view, FIG. 6 is an enlarged view of essential parts showing another embodiment of the present invention, FIG. 7 is a side view of FIG. 6, FIG. 8 is an enlarged view of a cutting edge before superfinishing, FIG. 9 is an enlarged view of the cutting edge after superfinishing. 1 …… Blade, 2 …… Bed, 4 …… Blade stop, 6 ……
Running body, 14, 15 ... Base, 28 ... Sliding body, 30 ...
... Sliding member, 36 ... Rotating grindstone, 37 ... Grinding amount setting device, 39 ... Fluid cylinder, 44 ... Rack member, 4
8,49 ... with blade.

Claims (1)

[Claims] Claim: What is claimed is: 1. A rotary grindstone which is capable of advancing and retracting and is urged toward the tool by fluid pressure is moved forward with respect to the blade that has been roughly sharpened and fixed to the tool mounting base, and the rotary grindstone is fluidized. Pressing against the cutting edge against pressure, the advance of the sliding member is stopped when the grinding amount is the distance that the rotary grindstone retreats relative to the sliding member, and the grinding amount is set. Once and move the rotary grindstone to the standby position where it passed the end of the blade in the longitudinal direction, and then apply rotation to the rotary grindstone to reciprocate in the longitudinal direction of the blade, and when reciprocating, wait for With the start of application of fluid pressure at the time when the rotating grindstone reaches the longitudinal end of the blade from the position,
When the rotary grindstone reaches at least one of the ends of the cutting tool, the fluid pressure is temporarily released and the rotary grindstone is separated from the cutting edge surface from the time when the grindstone reaches the end until the reverse operation is completed.