JPS6336903B2 - - Google Patents

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention provides a method for super-finishing the cutting edge after grinding the main blade surface using an existing knife grinder when grinding various long blades such as veneer laces and veneer slicers. The present invention relates to a method and apparatus for doing so.

``Conventional technology'' Conventionally, the above types of superfinishing of the cutting edge have been done artificially by hand with a flat whetstone, and in recent years,
As an alternative to this manual operation, attempts have also been made to use the spring force of a spring to press a grindstone against the cutting edge surface for superfinishing.

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

In addition, even in the latter method that uses the elastic force of the spring, even if you set the amount equivalent to manual grinding and start grinding, the spring elastic force will certainly cause the whetstone to enjoy the pressing force. However, this pressing force varies compared to the set value, and it results in constant vibration of the grinding wheel, causing the grinding wheel to bounce slightly in the longitudinal direction of the cutting edge surface, causing damage to the cutting edge. Become.

"Means for Solving the Problems" In view of the above, the present invention brings a rotary grindstone into contact with the cutting edge surface of a cutter while rotating, determines the amount to be ground while maintaining this state, and then: From the contact position, the rotary whetstone is urged against the cutting edge surface by fluid pressure and reciprocated in the longitudinal direction of the cutter, and further, when the rotary whetstone reaches the longitudinal end of the cutter,
When this is detected, the fluid pressure on the cutting edge surface of the rotary whetstone is temporarily released until the rotary whetstone moves backward or forward, and the rotary whetstone is reciprocated an arbitrary number of times to carry out profile grinding.

``Example'' Hereinafter, an example of an apparatus for directly carrying out the method of the present invention will be described first with reference to the configuration, 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.

At the top of both sides of the bed 2, there are rollers 5 at the four corners.
A pulley 8 of the prime mover 7 is mounted on a running body 6 on which a running body 6 is supported.
and the belt 1 between the pulley 9 that is pivoted below.
0 is suspended, and a chain wheel 11 fitted to the other end of the pulley 9 is secured to both ends of the bed 2 in the longitudinal direction by springs (not shown) and held in a tensioned state. It meshes with the chain 12, allowing the traveling body 6 to freely reciprocate.

At this time of meshing, as shown in FIG. 4, the chain wheel 11
A pair of auxiliary chain wheels 13 are supported on both sides adjacent to the chain 12, and are meshed with the chain 12, thereby preventing vibration when the chain wheel 11 rotates in mesh.

A pair of upper and lower bases 14 and 15 are attached to the traveling body 6 so as to face the cutter 1 on the mounting base 4 and are shifted in phase from each other in the longitudinal direction thereof. In this embodiment, the blade 1 is pressed and fixed with the blade surface 16 portion as the lower surface, so the blade surface 16
The lower base 15 in particular is pivotally supported in an inclined manner by a pair of support plates 17 arranged on both sides of the base 15, and into the lower opening 18 of one of the support plates 17, A guide rod 19 protruding from the lower base 15 is inserted, the other end of this guide rod 19 is engaged with the screw shaft 20, and the tilted state of the lower base 15 is adjusted by the screw movement of the screw shaft 20. are doing.

A prime mover 21 is installed on one side of each of the pair of upper and lower bases 14 and 15, and slides in the axial direction with respect to a rotating shaft 24 supported between a pulley 22 of the prime mover 21 and a pair of bearings 23. Free pulley 2
5, a belt 26 is suspended.

Further, a guide plate 27 is installed at a constant interval approximately in the center of these bases 14 and 15, and a sliding table 28 that can freely move forward and backward toward the cutting edge of the cutter 1 is engaged between the guide plates 27. Furthermore, the sliding body 30 is attached to the sliding guide 29 installed on the sliding table 28.
is on the shelf. In the illustrated example, the rotating shaft 24 is attached to the sliding guide 29 that employs a linear way.
An annular sliding body 30 is supported, and a regulating plate 31 is installed at the rear of the sliding body 30.

Further, a bearing 33 for supporting the feed shaft 32 is installed on the other side of the pair of upper and lower bases 14 and 15,
This feed shaft 32 is screwed into an arm 34 protruding from one side of the slide table 28. Further, a 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 rotary shaft 24. The amount of grinding of the cutter 1 by the rotating grindstone 36 is set.

In this embodiment, the grinding amount setting device 37 is configured by manually rotating a handle 38 fitted to the base end of the feed shaft 32, and setting the dial indicator 35.
For example, the setting is based on the indication scale of
A mechanism may be adopted in which the drive from the prime mover is transmitted to the feed shaft 32, and the dial indicator 35 is an indicator with a contact point, so that when a preset amount of grinding is reached, the screw movement of the feed shaft 32 is automatically stopped.

Further, a fluid cylinder 39 is attached to the other side of the slide table 28, and the tip of a rod 40 of the fluid cylinder 39 is connected to the regulation plate 31. Furthermore, the base 1
A detector 41 such as a limit switch or a phototube as in the illustrated example is attached to both ends of the detectors 4 and 15.

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 knife 1 whose main cutting surface has been ground using an existing knife grinder.
3 is occurring. If this rough ground surface is super-finished, a blade 44 with a smooth surface as shown in FIG. Attachment 45 is obtained.

Next, the action will be explained.

First, a cutter 1 that has been normally ground using an existing knife grinder is placed on a mounting table 4 with the cutter 16 facing downward, and held under pressure by a cutter 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 the angle is determined, the driving body 6 is moved by driving the prime mover 7 so that the rotary grindstone 36 reaches the surface of the cutter. When the traveling body 6 reaches the blade 1, the fluid cylinder 39 is activated and fluid is supplied from each port to move the rod 40 so that the pressure in the rear cylinder chamber is higher than that in the front cylinder chamber. Stretch it out,
Pressing the regulation plate 31 forward at all times, and at the same time,
The prime mover 21 is driven to apply rotational force to the rotary grindstone 36 located at the backward limit.

Next, when the feed shaft 32 is screwed and rotated, the sliding table 28 moves forward together with the sliding body 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 1, the sliding body 30 While stopping at the current position, only the slide table 28 begins to retreat.

In other words, even if the rotary grindstone 36 comes into contact with the cutting edge surface of the cutter 1, if the feed shaft 32 is still rotating in a spiral manner, the sliding body 30 will have the effect of retreating together with the sliding table 28. , because it is pushed forward by the rod 40 of the fluid cylinder 39.
The rotary grindstone 36 remains in contact with the cutting edge surface and remains relatively stationary, and only the sliding table 28 retreats.

This retreat amount becomes the amount of grinding of the blade 44 at the cutting edge portion, and the screw rotation of the feed shaft 32 is stopped when the dial indicator 35 indicates the desired scale or when it is set by preset.

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, when the prime mover 7 is driven to rotate the chain wheel 11, the chain wheel 11 is rotated by the auxiliary chain wheels 13 on both sides thereof.
Since the amount of suspension on the chain 12 is increased, slippage during transfer to the chain link is prevented, and the traveling body 6 moves forward smoothly.

During forward movement, when the traveling body 6 reaches one end in the longitudinal direction of the cutter 1 and the detector 41 detects this, the prime mover 7 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 backward, and during this time, the rotating grindstone 36 is separated from the cutting edge surface.

In this way, if the traveling body 6 is reciprocated multiple times to prevent burnt edges from occurring on the cutting edge portion of the cutting tool 1, the cutting tool 1 will have super-finished blades 44, 45 as shown in FIG. can be obtained.

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 surface 16 portion and the blade back portion of the blade 1. However, when only the blade face 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, the rotating grindstone is brought into contact with the cutting edge surface of the cutter, the amount to be ground is determined while maintaining this state, and then the rotating grindstone is moved from the contact position using fluid pressure. The blade is biased against the cutting edge surface and reciprocated in the longitudinal direction of the cutting tool.Furthermore, the fluid pressure on the cutting edge surface of the rotating grinding wheel is temporarily released until the rotating grinding wheel moves backward or forward. The blade is reciprocated an arbitrary number of times to perform profile grinding, so even if the blade is long and has slight deformation or unevenness in the longitudinal direction, the grinding amount that has been set will remain in contact with the rotary grindstone. This allows for uniform cutting from the beginning.

Therefore, compared to the conventional method described above, automation can be achieved, workability is improved, and superfinishing accuracy can be obtained that prevents damage to the cutting edge.

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 until the backward or forward movement, so both longitudinal ends of the cutting edge are ground unnecessarily. is gone,
Furthermore, it is possible to avoid collision between the both sides of the cutting edge in the longitudinal direction and the rotating grindstone, thereby preventing damage to both.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention, Figure 2 is a side view showing one embodiment of the present invention;
The figure is a view taken along the line A-A in Figure 1, Figure 3 is a view taken along the line B-B in Figure 1, Figure 4 is a view taken along the line C-C in Figure 1, and Figure 5 is a view taken along the line C-C in Figure 1. FIG. 3 is a view taken along line D-D in FIG. 3, FIG. 6 is an enlarged view of the cutting edge before superfinishing, and FIG. 7 is an enlarged view of the cutting edge after superfinishing. 1...Knife, 2...Bed, 4...Placement stand, 6
... Traveling body, 14, 15 ... Base, 28 ... Sliding table, 30 ... Sliding body, 36 ... Rotary grindstone, 37 ...
...Grinding amount setting device, 39...Fluid cylinder, 4
4,45...with blade.

Claims (1)

[Scope of Claims] 1. A rotary whetstone is brought into contact with the cutting edge surface of a cutter while rotating, the amount to be ground is determined while maintaining this state, and then the rotary whetstone is moved from the contact position using fluid pressure. The blade is pressed against the cutting edge surface, and the blade is moved back and forth in the longitudinal direction of the blade, and when the whetstone reaches the end of the blade in the longitudinal direction, this is detected and the whetstone moves backward or forward. A cutting edge superfinishing method characterized in that during this process, fluid pressure on the cutting edge surface of the rotating grindstone is temporarily released, and the rotating grindstone is reciprocated an arbitrary number of times to carry out profile grinding. 2. A base is attached to a running body that is fixed to a mounting base and is movable back and forth in the longitudinal direction of the cutter, and the cutter is ground on a sliding base that is slidable with respect to the base. A rotary grindstone for grinding is mounted on a sliding body, and is placed opposite to the cutting edge part with a phase shift, and a grinding amount setting device is installed between the base and the sliding table. A cutting edge superfinishing device characterized in that a rod of a fluid cylinder attached to a moving table is engaged with a sliding body.