JPS62181861A - Superfinishing of blade edge and apparatus thereof - Google Patents

Abstract

PURPOSE:To improve precision and efficiency by detecting the edge part in the longitudinal direction after a rotary grindstone is urged onto the blade crest from a contact position by a fluid pressure and once releasing the fluid pressure and carrying out copy grinding through the reciprocating movement, thus permitting the automatic superfinishing for the blade edge. CONSTITUTION:After the grinding quantity for processing the blade edge 44 at the blade edge part is set, a traveling body 6 is moved in reciprocation by a prime mover 7, and reaches one edge in the longitudinal direction of a cutter 1, and when a detector 41 detects this fact, the prime mover 7 is driven reversely through a timer, etc., and the feed of fluid into the rear part chamber of a fluid cylinder 39 is suspended once until the return movement of the traveling body 6 is started, and during this time, a rotary grindstone 36 is separated from the blade crest. Thus, when the traveling body 6 is moved in reciprocation several times so that no blade edge seizure is generated at the blade edge part of the cutter 1, the superfinely finished blade edges 44 and 45 can be obtained automatically on the cuter 1. Even if the long cutter has the fine deformation and unevenness in the longitudinal direction, the rotary grindstone can process uniformly the blade edge from the contact surface by the set grinding quantity.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is intended for grinding various long blades such as veneer laces and veneer slicers after grinding the main cutting edge using an existing rough-sharpening knife grinder. The present invention relates to a method and apparatus for superfinishing a cutting edge.

``Conventional technology'' Conventionally, the above type of superfinishing of the cutting edge has been done artificially by using a flat whetstone, and in recent years, as an alternative to this artificial process, the resiliency of a spring has been used. A method of super-finishing by pressing a grindstone against the cutting edge surface has also been attempted.

``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. In addition, because it is done by hand, the uniformity of the super-finishing accuracy cannot be guaranteed, and especially if the sharpener changes, the standard of the super-finishing accuracy will be slightly deviated, further impairing the uniformity of the super-finishing accuracy. It will be.

In addition, in the latter method that utilizes the elastic force of the spring, after rough-sharpening the blade using an existing knife grinder, the rough-sharpening whetstone is temporarily retracted from the grinding surface, and the super-finishing whetstone is placed on the blade edge surface. Even if you start grinding by setting the amount equivalent to hand stretching while guiding, the spring's elastic force will certainly make the grinding wheel enjoy a pressing force, but this pressing force will be lower than the set value. As a result, the grinding wheel is subject to constant vibration, causing the grinding wheel to bounce slightly in the longitudinal direction of the cutting edge surface, causing damage to the cutting edge.

Traditionally, this process of super-finishing the cutting edge has been considered a secondary concept when the main process is the rough-sharpening process of cutlery, so the frame of the existing knife grinder for rough-sharpening is shared, and the main edge of the cutlery is After the surface has been rough-honed, a super-finishing whetstone is used to super-finish the rough-honed edge of the knife. However, since knife grinders were originally installed with the intention of rough-sharpening blades, the time required for the super-finishing process is naturally shorter than the time required for the rough-sharpening process. From this point of view, it was impossible to expect a satisfactory superfinishing of the cutting edge.

Furthermore, when hand-stretching, a method is sometimes adopted in which the sharp edge of the blade is made slightly obtuse, and a so-called two-stage sharpening is applied to reduce the chance of chipping and improve the blade's durability. If this method, which relies on intuition, is carried out using an existing knife grinder that is equipped with both a rough grinding wheel and a super-finishing whetstone as described above, it is difficult to use the super-finishing whetstone. This is practically impossible because it requires a mechanism to change the angle to the blade edge surface, and it also takes time to change the angle.

In view of the above, the present invention has been developed by fixing a knife whose main blade surface has been rough-sharpened by a separately installed knife grinder on a mounting table, and then applying a method to the cutting edge surface of this knife. The rotating whetstone is brought into contact with the blade while rotating, and the amount to be ground is determined while maintaining this state.Then, the rotary whetstone is urged from the contact position against the cutting edge surface by fluid pressure, and is reciprocated in the longitudinal direction of the blade. move it,
When the rotary whetstone reaches the longitudinal end of the cutter, this is detected, and until the rotary whetstone makes a backward or forward movement, the fluid pressure on the cutting edge surface of the rotary whetstone is temporarily released, and the rotary whetstone is moved freely. By reciprocating the blade several times and performing profile grinding, the mechanical uniformity of the superfinishing accuracy of the cutting edge is maintained, and the superfinishing work is automated.

"Embodiment" Hereinafter, an embodiment of an apparatus for directly carrying out the method of the present invention will be described based on the accompanying drawings.

A mounting table 4 for holding the cutter l under pressure with a cutter presser 3 is installed on an example part of the bed 2 having at least the length of the cutter l to be ground.

A running body 6 with rollers 5 supported at its four corners is mounted on the upper sides of both sides of the head 20, and a pulley 8 of a prime mover 7 attached to the lower part of one side of this running body 6, and a shaft below it. The belt IO is hung around the supported boo 179, and the pulley 9
The chain wheel 11 fitted on the other end is engaged with the chain wheel 12 which is held in tension by springs (not shown) at both ends of the bed 2 in the longitudinal direction, and the running body 6 is moved. It can freely move back and forth.

At the time of this meshing, as shown in FIG. This prevents agitation during movement.

A pair of upper and lower bases 14 and 15 are attached to the traveling body 6 so as to face the cutter l on the mounting base 4 and are shifted in phase from each other in the longitudinal direction thereof. In this embodiment, the cutter l is pressed and fixed with the blade back 16 portion as the lower surface, so in order to follow the slope of the blade back 16, the lower base 15 in particular is supported by a pair of supports disposed on both sides thereof. A guide rod 19 that is pivoted in an inclined manner by the plate 17 and protrudes from the lower base 15 is inserted into the lower opening 18 of one of the support plates 17, and the other end of this guide rod 19 is connected to the screw shaft 20. engaged with;
The inclination state of the lower base 15 is adjusted by the screw movement of the screw shaft 20.

The pair of upper and lower bases 14 and 15 are each equipped with a drive JA2+, which is slidable in the axial direction with respect to a rotary shaft 24 supported by a pulley 22 of the motor 21 and a pair of bearings 23. A belt 26 is suspended around the Boo 1J25.

Furthermore, guide plates 27 are installed approximately in the center of these bases 14 and 15 at regular intervals, and a sliding table 28 that can freely move forward and backward toward the cutting edge of the cutter l is engaged between the guide plates 27. Furthermore, a sliding body 3o is mounted on a sliding guide 29 installed on this sliding table 28.

In the illustrated example, a sliding guide 29 employing a linear way supports an annular sliding body 30 that supports the rotary shaft 24 through the sliding guide 29, and a regulating plate 31 is provided at the rear of the sliding body 3o.
is installed.

Further, on the other side of the pair of upper and lower bases 14.15, a bearing 33 for supporting the feed shaft 32 is installed.
is screwed into an arm 34 protruding from one side of the sliding table 28. Further, the dial indicator 35 is attached to the slide table 28, and the tip of its spindle is brought into contact with the regulation plate 31, so that the feed amount of the slide table 28, that is, the dial indicator 35 is fitted to the tip of the rotation shaft 24. The amount of grinding of the cutter 1 by the rotating grindstone 36 is set.

In this embodiment, this grinding amount setting device 37 has the following functions:
The handle 38 fitted to the base end of the feed shaft 32 is manually rotated to set the setting based on the indication scale of the dial indicator 35. For example, if the drive from the prime mover is transmitted to the feed shaft 32, The dial indicator 35 may be used as an indicator with a contact point, and the mechanism may be such that the threading of the feed shaft 32 is automatically stopped when a preset amount of grinding is reached.

Further, a fluid cylinder 39 is attached to the other end of the sliding table 28, and the tip of a rod 40 of the fluid cylinder 39 is connected to the regulating plate 31. Furthermore, at both ends of the base 14.15,
A detector 41 such as a limit switch or a phototube as in the illustrated example is attached.

In addition, 42 in the figure is a cooling water receiving gutter provided between the bed 2 and the mounting table 4 over the entire moving distance of the rotary grindstone 36. FIG. 6 shows a rough-sharpened knife l whose main blade surface has been ground using an existing knife grinder for rough-sharpening, and the ground surfaces of the front blade 16 and the back of the blade are rough;
Furthermore, a burr 43 is generated toward the back side of the blade. If this rough ground surface is super-finished, a blade 44 with a smooth surface as shown in FIG. Appendix 4
5 is obtained.

Next, the action will be explained.

First, in a plywood or woodworking factory, the main cutting surface of the cutter 1 is roughly sharpened by -H using an existing knife grinder for rough sharpening which is usually installed in an adjacent position. Thereafter, the blade l whose main blade surface has been roughly sharpened is placed on the mounting table 4 with the blade surface 16 facing downward, and is pressed and held by the blade holder 3.

Next, in order to adjust the grinding angle of the lower rotary whetstone 36 on the blade surface 16, the lock nut is loosened and the screw shaft 20 is turned appropriately to determine the inclination angle of the lower base 15, and then the lock nut is tightened again. Tighten and secure.

After determining the angle of 1 degree, rotate the whetstone 36 so that it reaches one surface of the blade.
The driving body 6 is moved by driving the prime mover 7. When the traveling body 6 reaches the first surface of the blade, the fluid cylinder 39 is activated,
Fluid is supplied from each boat so that the pressure in the rear cylinder chamber is higher than that in the front cylinder chamber.
is extended to press the regulating plate 31 forward at all times, and at the same time, the driving force 41121 is driven to apply rotational force to the rotary grindstone 36 located at the backward limit.

Next, when the feed shaft 32 is spirally rotated, the sliding table 28 is guided by the guide plate 27 and advances together with the sliding body 30, and after the rotary grindstone 36 comes into contact with the cutting edge surface of the cutter l, the IH
With the moving body 30 stopped at the I1 position, the sliding table 28
only begins to retreat.

That is, even if the rotary grindstone 36 comes into contact with the cutting edge surface of the cutter l, if the feed shaft 32 is still spirally rotating, the sliding body 30
The rotary grindstone (6) has a tendency to move backward together with the IH moving table 28, but since it is pressed against the surface by the fluid cylinder 390 rod 4o, the rotary grindstone (6) remains relatively stationary while remaining in contact with the cutting edge surface. state, and only the sliding table 28 is moved backward.

This amount of backward movement is the amount of grinding of the blade 44 at the cutting edge, and the feed axis 3
Stop the screw rotation of step 2.

When setting the grinding amount, that is, until the slide table 28 stops retreating, the rotary grindstone 36 is in constant contact with the blade edge surface in a rotating state, and in order to avoid contact with the same part. ,
The running body 6 may be run at low speed.

Next, the Dynamic 4I! When the chain wheel 11 is rotated by driving the chain wheel 11, the chain wheel 11 is held between the auxiliary chain wheels 13 on both sides of the chain wheel 11, and since the suspension type with respect to the chain link 12 is increased, there is no slippage when transferring to the chain link. This prevents the traveling body 6 from traveling smoothly.

On the way out, when the traveling body 6 reaches one end in the longitudinal direction of the cutter 1 and the detector χOz detects this, the driving force W7 is reversely driven via an appropriate timing device such as a timer, and the fluid cylinder 39 is activated. The supply of fluid to the rear chamber is temporarily stopped until the traveling body 6 starts to move back, and during this time, the rotating grindstone 36# is turned back from the cutting edge surface.

In this way, if the traveling body 6 is reciprocated several times to prevent edge burn from occurring on the cutting edge portion of the cutting tool l, the cutting tool l will have a super-finished blade 44.45 as shown in FIG. Obtainable.

In this embodiment, a case will be described in which a pair of rotary grindstones 36 are disposed above and below the blade 1 facing the blade 1 in order to simultaneously grind the blade back 1fi portion and the blade back portion of the blade 1. However, when only the blade back 16 portion is to be ground, it is natural that one of the rotary grindstones 36 is unnecessary.

"Effects" As described above, according to the present invention, after fixing a knife whose main blade surface has been rough-honed by a separately arranged knife grinder on a mounting table, while rotating a rotary whetstone on the cutting edge surface of the knife, Then, while maintaining this state, the grinding wheel to be ground is determined.Then, from the contact position 1, the rotary whetstone is urged against the blade edge surface by fluid pressure, and the reciprocating shaft is rotated in the longitudinal direction of the blade. When the whetstone reaches the end in the longitudinal direction of the cutter, this is detected, and the fluid pressure on the cutting edge surface of the rotary whetstone is temporarily released until the whetstone moves backward or forward, and the whetstone is moved freely. Since copy grinding is performed by reciprocating the axis several times, even if the cutter is long and has a V-shaped deformation or unevenness in the longitudinal direction, the contact surface of the rotary whetstone will only be ground by the set amount of grinding. It is possible to sharpen the blade evenly.

In addition, when the rotating whetstone reaches the longitudinal end of the cutter, the cutting edge and the rotating whetstone are temporarily separated from each other during the backward or forward movement, so both longitudinal ends of the cutting edge are ground unnecessarily. In addition to eliminating sagging, it is possible to avoid collision between both longitudinal ends of the cutting edge and the rotating grindstone, thereby preventing damage (U) between the two.

Furthermore, since the superfinishing SM machine of the present invention is installed separately from the knife grinder for rough sharpening, it takes the time equivalent to conventional hand stretching while maintaining mechanical uniformity. Even if it is super-finished, it is possible to perform super-finishing at the same time as the rough-sharpening of the blade, so compared to the method of super-finishing using the existing knife grinder described above, it is easier to rough-sharpen and super-finish the blade. It becomes possible to shorten one cycle of the entire grinding process. In particular, it will take a longer time to sharpen knives that have had large chips on the cutting edge due to biting into iron pieces, gravel, etc. when cutting logs, but this problem may occur if the blade has already been roughly sharpened. It is possible to sequentially superfinish the cutlery, which improves work efficiency.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a side view showing one embodiment of the present invention, and Fig. 2 is a side view showing an embodiment of the present invention.
Figure 3 is a view taken along line B-B in Figure 1, Figure 4 is a view viewed along line C-C in Figure 1, and Figure 5 is a view taken along line C-C in Figure 3. D-D line arrow view, Figure 6 is an enlarged view of the cutting edge of Superfinishing City,
FIG. 7 is an enlarged view of the cutting edge after superfinishing. DESCRIPTION OF SYMBOLS 1... Knife, 2... Head 4... Mounting stand, 6... Traveling body, 14, 15.
...Base, 28...Sliding stand, 30...
sliding body, 36... rotating grindstone, 37... grinding amount setting device, 39... fluid cylinder, 44.45.
...Blade, Patent applicant: Taihei Seisakusho Co., Ltd. Procedural amendment voluntarily written) January 17, 1985 1, Indication of the case 1988 Patent Application No. 297361 2, Name of the invention Cutting edge superfinishing method and device 3, Relationship with the case of the person making the amendment Patent applicant postal code 485 Address Aichi Prefecture 1JZk'Tr1Oaza'AMiWtM letter M
Address M900 Name: VVM Co., Ltd. Iji 5, Subject of amendment: "Detailed description of the invention" column of Mei 5A. l) In the "Detailed Description of the Invention" section of the specification, from page 10, line 15 to page 11, line 6, it says, "Then, the feed shaft...will move backward." Correct as below. r Next, when the feed shaft 32 is screwed, the IH moving base 2
8 moves forward together with the sliding table 30 while being guided by the guide plate 27, and after the rotary grindstone 36 comes into contact with the cutting edge surface of the cutter l,
With the sliding base 28 stopped at the current position, only the sliding body 30 begins to retreat.

Claims (1)

[Claims] 1. After fixing a knife whose main blade surface has been rough-honed by a separately installed knife grinder on a mounting table, a rotating whetstone is brought into contact with the cutting edge surface of the knife while rotating, The amount to be ground is determined while maintaining this state, and then the rotary whetstone is urged against the cutting edge surface by fluid pressure from the contact position, and is reciprocated in the longitudinal direction of the cutter. When the end of the wheel is reached, this is detected and the fluid pressure on the cutting edge surface of the rotary wheel is temporarily released until the wheel moves back or forward, and the wheel is reciprocated an arbitrary number of times to perform profile grinding. A cutting edge superfinishing method characterized by: 2. A mounting table is installed on a bed that is separate from the frame of the knife grinder for rough sharpening, and the knife is fixed on this mounting table and is based on a running body that can freely reciprocate in the longitudinal direction of the knife. A rotary grindstone for grinding the cutter is mounted on the sliding table which can freely slide with respect to the base, via a sliding body, and is positioned relative to the cutting edge portion with a phase shift. A cutting edge characterized in that a grinding amount setting device is installed between the base and the sliding table, and a rod of a fluid cylinder attached to the sliding table is engaged with the sliding body. Super finishing equipment.