JPH02284854A - Method and device for superfinishing edge point - Google Patents

Abstract

PURPOSE:To prevent a defect of excessive grinding, chip, waviness, etc., generated when excessive weight acts on an edge point, by advancing or returning a rotary grindstone in the lengthwise direction of a cutting tool while maintaining urging force applied to surfaces of the edge point maintaining almost to a fixed value. CONSTITUTION:After a grinding amount is determined by restricting an amount, in which a rotary grindstone 44 tends to retract when it is pressed to edge point surfaces of a cutting tool 1 after grinding the main edge surface, by an urging pressure, when the rotary grindstone 44 is urged to the edge point surface of the cutting tool 1, the own weight of the rotary grindstone 44 is removed by a balancer synchronously sliding in a direction of an edge point. While the urging pressure of the grindstone 44, acting on the edge point surface, is maintained almost to a fixed value, the rotary grindstone 44 is moved being advanced or returned in the lengthwise direction of the cutting tool 1. By the constitution such obtained, a defect of overgrinding, chip, waviness, etc., generat ed when excessive weight is applied to an edge point part especially sharpened, can be prevented.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention aims to improve the cutting edge angle after grinding the main cutting edge using an existing knife grinder when grinding 8 long blades such as veneer laces and veneer slicers. When obtaining a so-called solid sharpening without changing the edge angle, or a multiple 0-stage sharpening such as bifurcated claw sharpening or three-stage sharpening, the angle formed or the rotation relative to the cutting edge due to the angle change. The present invention relates to a method and apparatus for maintaining the biasing pressure of a grindstone approximately constant.

``Prior art'' Traditionally, the above type of superfinishing of the cutting edge has been done artificially (by hand with a flat grindstone), and in recent years, as an alternative to this artificial process, spring elastic force, Alternatively, the grindstone is pressed against the cutting edge surface using urging pressure such as fluid pressure from a fluid cylinder to achieve superfinishing.

``Problems to be solved by the invention'' However, the former type of artificial work is performed by hand, relying on intuition, and requires considerable skill and takes a long time, making it extremely inefficient.

Even in the latter method, which uses biasing pressure such as the elastic force of a spring or the fluid pressure of a fluid cylinder, when grinding is started, the biasing force will certainly cause the grindstone to receive a G force. However, the weight of the grindstone is subtracted from or added to this pressing force compared to the set value, and the grindstone bounces slightly in the longitudinal direction of the cutting edge surface, causing damage to the cutting edge.

However, depending on the conventional method, the superfinished surface of the cutter after the main cutting surface has been ground does not have a uniform sharpness, and excessive grinding, waviness, etc. occur in some parts.

"Means for Solving the Problems" In view of the above, the present invention makes a traveling body reciprocating by a drive device in the longitudinal direction of a cutter fixed to a mounting table, and an angle relative to the traveling body is provided. On a base that is pivotally supported via a setting device, a rotary grindstone for grinding the cutter is connected to a first stage sliding part that can freely slide with respect to the cutter, and a rotary grindstone for grinding the cutter is connected to the base through a second stage sliding part. In addition, a grinding amount setting device is installed between the base and the first stage sliding part, and a grinding amount setting device is installed between the base and the first stage sliding part. The rod or spring of the mounted fluid cylinder is engaged with the second stage sliding part, and a balancer is mounted on a rail member that projects from the top of the base in parallel with the sliding direction, and this balancer When the rotary whetstone is urged against the cutting edge surface of the cutter by setting an arbitrary part of the link that pivots between the first stage sliding part and the first stage sliding part into a pivoting state that projects from the second stage sliding part, the rotary whetstone The weight of the grinding wheel is removed by a balancer that slides synchronously toward the cutting edge, and the urging pressure of the rotary grindstone applied to the cutting edge surface is maintained almost constant.

"Example" Embodiments of the present invention will be described below with reference to the accompanying drawings.

On one side of the bed 2 having at least the length of the blade 1 to be ground, a mounting table 4 for holding the blade 1 under pressure with a blade holder 3 is installed.

A running body 6 having rollers 5 supported at its four corners is mounted on both upper sides of the bed 2, and a driving device 7 is installed for this running body 6G. This drive device 7 includes fluid motion, screw motion,
Alternatively, a motor 8 may be installed at the lower part of one side of the running body 6 as shown in the figure, and a belt 11 may be suspended between a pulley 9 of this motor 8 and a pulley 10 that is pivotally supported below the pulley 9. The chain wheel 12 fitted at the end is engaged with the chain wheel 13 which is held in tension by springs (not shown) at both longitudinal ends of the bed 2, and the running body 6 is moved back and forth. I am free to do so.

At the time of this meshing, as shown in FIG. Prevents vibration during rotation.

In the nine embodiments, a pair of upper and lower bases 15 and 16 are accommodated in the traveling body 6 so as to face the cutter 1 of the mounting base 4 and are shifted in phase from each other in the longitudinal direction. In this case, the cutter 1 is pressed and fixed with the blade face 17 as the lower surface, so in order to follow the slope of the blade face 17, the lower base 16 in particular has to be fitted with gear teeth or a screw as shown in the figure. An angle setting device 18 for movement is provided.

That is, the lower base 16 is pivoted in an inclined manner by a pair of support plates arranged on both sides thereof, and the lower base 16 projects into the lower opening 20 of one of the support plates 19. The other end of this guide rod 21 is engaged with a screw shaft 23 to which a motor 22 is directly connected, and the tilted state of the lower base 16 is adjusted by the screw movement of the screw shaft 23. The angle is detected by a rotation angle detector 24 consisting of an encoder, a linear transformer, etc.

A driving force @ 25 is installed on one side of each of the pair of upper and lower bases 15 and 16, and the pulley 26 of this driving engine 25 and
A belt 30 is suspended around a pulley 29 that is slidable in the axial direction with respect to a rotating shaft 28 supported between a pair of bearings 27.

Furthermore, guide plates 31 are installed approximately in the center of these bases 15 and 16 at regular intervals, and a sliding table 32 that can freely move forward and backward toward the cutting edge of the cutter 1 is engaged between the guide plates 31. By doing so, a first stage sliding part 33 is configured that can move forward and backward in the direction of the cutting edge with respect to the base 15.
5 is placed thereon to constitute the second stage sliding part 36, and the first stage sliding part 33 and the second stage sliding part 36 are relatively slidable. In the illustrated example, a sliding guide 34 employing a linear way supports an annular sliding body 35 in which the rotating shaft 28 is inserted and supported, and a regulating plate 37 is installed at the rear of the sliding body 35. There is.

Further, a bearing 39 for supporting the feed shaft 38 is installed on the other side of the pair of upper and lower bases 15.16.
is screwed into an arm 40 protruding from one side of the sliding table 32. Further, a dial indicator 42 with contacts that can set a plurality of preset amounts 41 is attached to the sliding base 32, and the tip of its spindle 43 is brought into contact with the regulating plate 37, and the dial indicator 42 is slidable. The amount of feed of the table 32, that is, the amount of grinding of the cutter 1 by the rotary grindstone 44 fitted to the tip of the rotating shaft 28 is set.

In this embodiment, this grinding amount setting device 45 is as follows:
Drives a motor 46 directly connected to the base end of the feed shaft 38,
When it is confirmed by a proximity switch (not shown) etc. that the indication scale of the dial indicator 42 has reached an arbitrary preset amount 41, the drive is stopped, but this dial indicator 42 can be substituted. A detection mechanism using an encoder, linear transformer, etc. may also be used.

At this time, each part placed on the base 15.16 is
A similar effect can be obtained even if the components are arranged in a G-column arrangement as in the second embodiment shown in FIGS. In FIGS. 6 to 7, parts that are the same as those in the above embodiment are given the same numbers and will not be described repeatedly. That is, the first stage sliding portion 33 on the base 15.16 that is slidable with respect to the cutter 1 is connected to the base 1.
The rack member 48 is fitted into and supported by a bearing 47 installed on the blade 5.16, and the rack member 48 is made to freely flip in the direction of the cutting edge by driving the motor 46. Further, the second stage moving part 36 that supports the rotary grindstone 44 for grinding the cutter 1 supports the rotating shaft 28 slidably in the axial direction between a pair of bearings 27 installed on the base 15.16. It is composed of At this time, on the upper ends of the four brackets fitted to the tip of the rack member 48,
A fluid cylinder 50 is absorbed, and the tip of its piston rod 51 is connected to the regulating plate 37. The grinding amount setting device 45 is controlled by a motor 46 that drives a rack member 48, and confirms with a proximity switch (not shown) etc. that the indicated scale of the dial indicator 42 has reached an arbitrary preset amount 41. The setting is made by stopping the drive when the

Furthermore, as shown in FIGS. 8 to 9 as a third embodiment, the same effect can be obtained even if the parts arranged on the base 15 and 16 are replaced with those shown in the second embodiment. can get. In FIGS. 8 to 9, parts that are the same as those in the second embodiment are given the same numbers and will not be described repeatedly. That is, the bearing 47 that supports the rack member 48 is fitted onto the bearing 27 that supports the rotating shaft 28 installed at the rear of the base 15, 16, and the rack member 48 is moved to the cutting edge by driving the motor 46. The first stage sliding part 33 is slidable in the direction
It consists of

Further, a fluid cylinder 50 is attached to a bracket 49 fitted to the tip end portion of the rack member 48, and the tip of the piston rod 51 is connected to the regulation plate 37, thereby forming the second stage sliding section 36. are doing. At this time, a pair of sliding guides 34 installed at the front of the base 15° 16 support a sliding body 35 that supports the rotating shaft 28 through the sliding body 35, and the above-mentioned regulation A plate 37 is connected.

In addition, 52 in the figure is a detector consisting of a limit switch, a phototube, a proximity switch, etc. attached to both ends of the base 15, 16, and 53 in the figure is a detector between the bed 2 and the mounting table 4. A cooling water receiver provided over the entire moving distance of the rotary grindstone 44 is a gutter. FIG. 10 shows a knife 1 whose main cutting surface has been ground using an existing knife grinder. The cracks occur at intervals of fine mesh, and furthermore, burrs 54 occur toward the back side of the blade. If this rough ground surface is superfinished, a blade 55 with a smooth surface as shown in FIG. 11 will be obtained, and the grinding marks will be wiped out. By fitting the blade angle 56 from the back side of the blade at the time of cutting 55, the cutting edge 55 becomes an obtuse angle, and a cutter 1 with less edge spillage can be obtained.

In each of the first to third embodiments, the first stage sliding portion 33
, it has a second stage sliding part 36, but the base 15
．． 16, the weight of the rotating grindstone 44 is removed by a balancer 57 in order to keep the biasing pressure of the rotary grindstone 44 against the cutting edge constant.

That is, for the sake of convenience, an example thereof will be explained based on the third embodiment.
A rail member 58 is made to protrude parallel to the sliding direction of the rail member 58, and a balancer 57 comprising five sliding members such as rollers or linear ways is mounted on the rail member 58, and this balancer 57 and the second An arbitrary portion of the link 60 that pivots between the stage sliding parts 36 is pivotally supported on a support member 61 that protrudes from the front part of the first stage sliding part 33. At this time, the weight of the balancer 57 is determined by the length of the link 60 from the pivot point.

Next, the effect will be explained.

First, a blade whose main cutting surface has been ground using an existing knife grinder! $Jl is placed horizontally on the mounting table 4 as shown in the first embodiment, or vertically placed as shown in the second embodiment, and is pressed and held by the knife holder 3.

Thereafter, the angle setting device 18 sets the grinding angle to the manly part of the rotating grindstone 44, which is the lower one of the upper and lower pair in the first embodiment, and the left one of the left and right pair in the second embodiment. , the motor 22 is driven by a required amount, this angle is detected by the rotation angle detection device 24, and the drive device 7 is operated.

Next, the grinding 1 setting device 45 sets the desired amount of grinding to the cutting edge. First, the prime mover 8 is driven so that the rotary grindstone 44 reaches the surface of the cutter, and the traveling body 6 is moved. When the traveling body 6 reaches the surface of the cutter 1, the fluid cylinder 50 is activated, and fluid is supplied from each boat to the piston rod so that the pressure in the rear cylinder chamber is higher than that in the front cylinder chamber. 51 is extended, and the first stage sliding part 33 and the second stage sliding part 36 are advanced in the direction of the cutting edge while the regulating plate 37 is always pressed forward.

At this time, in the first embodiment, when the feed shaft 38 is spirally rotated, the sliding table 32 moves forward together with the sliding body 35 while being guided by the guide plate 31, and the rotary grindstone 44 is brought into contact with the cutting edge surface of the cutter 1. After making contact, only the sliding body 35 begins to retreat while the sliding base 32 is stopped at the current position. That is, even if the rotary grindstone 44 comes into contact with the cutting edge surface of the cutter 1, if the feed shaft 38 is still spirally rotating, the sliding body 35 will have no contact with the sliding base 3.
However, since the piston rod 51 of the fluid cylinder 50 constantly pushes the rotary grindstone 44 forward, the rotary grindstone 44 remains in contact with the cutting edge surface and remains relatively stationary, causing the sliding body 35 to move backward. Only? ! t, I will meet you.

This amount of retraction takes into account the amount of grinding for the cutting edge part 55, and the estimated amount that includes differences in the amount of fine undulations and unevenness that normally exist at the time the main cutting surface is ground. When the indication scale set by the preset ff141 of the dial indicator 42 is reached, the screw rotation of the feed 1fij38 stops.

According to the second embodiment shown in FIGS. 6-7, when the rack member 48 is advanced along the bearing 47, the piston rod 51 of the fluid cylinder 50 accommodated in the four brackets is The rotating shaft 28 is slid in the axial direction via the regulating plate 37, and the rotary grindstone 44 is brought into contact with the cutting edge surface of the cutter 1.

Thereafter, a moment acts on the rotary shaft 28 to try to retreat from the current position, but as in the former embodiment, the rotary shaft 28 is constantly pushed forward by the piston rod 51 of the fluid cylinder 50. will come into contact with the cutting edge surface. The fluid pressure that presses the rotary shaft 28 forward includes the amount of grinding for the cutting edge portion 55, as well as the difference in the amount of minute undulations and irregularities that normally exist when the main cutting surface is ground. The rotation shaft 2 is rotated against this fluid pressure.
The amount by which the blade 8 moves back is the amount of grinding required for the blade attachment 55 on the cutting edge portion.

Furthermore, the 8th UJ! According to the third embodiment shown in FIGS. The sliding body 35 into which the rotating shaft 28 is inserted is slid in the axial direction, and the rotating grindstone 44
is brought into contact with the cutting edge surface of the knife 1. Thereafter, a moment acts on the rotary shaft 28 to try to retreat from the current position, but as in each of the above embodiments, the rotary shaft 28 is constantly pushed forward by the piston rod 51 of the fluid cylinder 50, so the rotary grindstone 44 It will come into contact with the cutting edge surface.

The fluid pressure that presses the rotary shaft 28 forward is applied to the amount of grinding required for the blade attachment 55 on the cutting edge portion, and also to the fine undulations that normally exist when the main cutting surface is ground.
It takes into account the estimated amount including the difference in the amount of unevenness,
The amount by which the rotary shaft 28 retreats against this fluid pressure is the amount of grinding required for the blade attachment 55 on the cutting edge portion.

At this time, by setting the angle of the base 15.16,
It is now in a tilted state than the current state, and the members constituting the rotary grindstone 44 and the second stage sliding part 33 try to slide on the second stage sliding part 36 due to their own weight, but one side of the base 15.16 Balancer 5 on rail member 58 protruding from the upper end
7 slides on the rail member 58 using the support member 61 as a fulcrum in a direction to avoid its own weight, thereby keeping the amount of grinding on the cutting edge constant.

After setting the amount of grinding, fluid is removed from the rear cylinder chamber of the fluid cylinder 50 to bring the piston rod 51 to its contraction limit, and the driving device 7 causes the traveling body 6 to return to the standby position. Next, the driving force @25 is driven to impart rotation to the rotary grindstone 44 located at the backward limit.

When the chain wheel 12 is rotated with the start of driving of the drive device 7, the chain wheel 12 is held between the auxiliary chain wheels 14 on both sides, and the amount of suspension on the chain 13 is increased, so that transfer to the chain link is difficult. This prevents slippage and allows the traveling body 6 to move forward smoothly. During forward movement, the traveling body 6 reaches one end of the blade 1 in the longitudinal direction.

When the detector 52 detects this, a timer such as a timer,
Alternatively, the distance is determined by the amount of pulses, and the prime mover 8 is reversely driven, and the supply of fluid to the rear chamber of the fluid cylinder 50 is temporarily stopped, and during this time, the rotating grindstone 44 is separated from the cutting edge surface.

From now on, to prevent the edge of the knife 1 from getting burnt,
The backward movement and forward movement of the traveling body 6 are repeated. If this grinding is a flat grinding, the rotary whetstone 44 is in parallel contact with the back of the blade after the main blade surface has been ground, so the grinding is done almost uniformly. In the case of step sharpening, since the rotary grindstone 44 initially contacts the sharp portion of the cutter 1 in a line contact state, the amount of grinding will be different.

The completion of grinding at this angle is indicated by the number of times on the counter or the preset amount 4 on the dial indicator 42.
1, by stopping the drive device 7 and activating the angle setting device 18, the motor 22 is driven by the required amount to set the next grinding angle, and this angle is detected as the rotation angle. It is detected by the device 24 and the drive device 7 is actuated.

Each time this angle is changed, as described above, the balancer 57 slides on the rail member 58 to avoid the weight of the members constituting the rotary grindstone 44 and the second-stage sliding part 33, and then Multi-stage sharpening is completed by sequentially repeating three-stage sharpening, three-stage sharpening, etc. according to the conditions.

In each of the above-mentioned embodiments, the first stage sliding portion 33 on the base 15, 16 is slidable relative to the cutter 1, and the second stage supports the rotary grindstone 44 for grinding the cutter l. Sliding part 3
6 connects a fluid cylinder 50 to one end and a piston rod 51 to the other end to control the amount of grinding by fluid pressure, but a spring (not shown) may be used instead.

In addition, since it is sufficient to remove the burrs 54 and the grinding marks on the back of the blade of the blade 1, the rotary whetstone 44 of the base 15 on the back of the blade is brought into contact with the back of the blade in parallel when grinding the back of the blade for the first time. The number of times the back of the blade is ground is also smaller than that of the back of the blade.

"Effects" As described above, according to the present invention, the driving device allows the traveling body to freely reciprocate in the longitudinal direction of the cutter fixed to the mounting table, and the angle setting device controls the traveling body. On the pivoted base, a rotary grindstone for grinding the blade is supported via a second sliding part on a first stage sliding part that is slidable with respect to the blade, and a cutting edge is supported on the base. A grinding ffi setting device is installed between the base and the first stage sliding part, and a fluid cylinder is sorbed to the first stage sliding part. A rod or a spring is held on the second stage sliding part, and a balancer is mounted on a rail member projecting from the upper part of the base in parallel with the sliding direction, and this balancer and the second stage Any part of the link that pivots between the sliding parts is pivotally supported on the support member protruding from the first stage sliding part, so when the rotary whetstone is urged against the cutting edge surface of the cutter, the rotary whetstone The dead weight of the blade is removed by a balancer that slides synchronously toward the cutting edge, and while maintaining the urging pressure of the rotary grindstone applied to the cutting edge surface, the cutting tool can be moved forward or backward in the longitudinal direction. It can prevent defects such as over-grinding, chipping, and waviness that occur when excessive weight is applied to the sharp edge of the blade9.

[Brief explanation of drawings]

FIG. 1 is a side view showing the first embodiment of the device of the present invention, FIG. 2 is a view taken along the line A-A of the first section, and FIG. 3 is a view taken along the line B-B of FIG. Section 4 is a section taken along the line C--C in FIG. 1, FIG. 5 is a section taken along line D--D in FIG. 3, and FIG. Section 7 is a side view of FIG. 6, FIG. 8 is an enlarged side view of main parts showing the third embodiment of the present invention, and FIG. 9 is a side view of FIG.
FIG. 10 is an enlarged view of the cutting edge before superfinishing, and FIG. 11 is an enlarged view of the cutting edge after superfinishing. 1...Knife, 2...Bed, 4...
Mounting table, 6... Traveling body, 15, 16... Base, 18... Angle setting device, 24... Rotation angle detection device, 32... Sliding table, 33... First Stage sliding part, 35...Sliding body, 36...Second stage sliding part,
41... Preset location, 42... Dial indicator, 44... Rotary grindstone, 48... Rack member, 4
Bracket, 57 Balancer, 58
...Rail member, 60...Link, Mizuki 2A Patent applicant: Taihei Seisakusho Co., Ltd.

Claims (1)

[Scope of Claims] 1. After determining the grinding amount by regulating the amount by which the rotary whetstone tends to retreat when the rotary whetstone is pressed against the cutting edge surface of the cutter after the main blade surface has been ground, the rotary whetstone When applying pressure to the cutting edge surface of a cutter, the weight of the rotary whetstone is removed by a balancer that synchronously slides toward the cutting edge, and the force of the rotating grindstone applied to the cutting edge surface is maintained almost constant. A cutting edge superfinishing method characterized by forward or backward movement in the longitudinal direction. 2. A traveling body is made to be able to reciprocate in the longitudinal direction of the cutlery fixed to the mounting table by means of a drive device, and on the base which is pivotally supported with respect to this traveling body via an angle setting device. , a rotary grindstone for grinding the cutter is supported by a first-stage sliding part that can freely slide on the cutter via a second-stage slide part, and a rotary grindstone is supported in a phase-shifted manner relative to the cutting edge part. Placed in the direction of
Furthermore, a grinding amount setting device is installed between the base and the first stage sliding part, and a rod or a spring of a fluid cylinder attached to the first stage sliding part is connected to the second stage sliding part. engage,
On the other hand, a balancer is mounted on a rail member that protrudes from the upper part of the base in parallel with the sliding direction, and an arbitrary part of the link that pivotally supports between the balancer and the second-stage sliding part is 1
A cutting edge superfinishing device characterized by being pivotally supported on a support member protruding from a step sliding part.