JPS626930B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a saw side surface grinding and finishing device that automatically performs saw side surface grinding and chisel width grinding.

(Background Art) As shown in FIGS. 1A and 1B, a band saw 1 for sawing wood generally has a highly hard and heat-resistant stellite chip 2 welded to its cutting edge. This is then ground and finished into the shapes shown in Figure 2 A and B. Incidentally, the tooth throat 3 and the tooth back 4 are ground with an automatic sharpening machine, and the width of the cut is ground with a band saw side surface grinding finishing device.

Figures 3A and 3B show ideal clams.
In other words, ideally, the opening angle θ ₁ of the clam is 18° to 20°, and the relief angle θ ₂ is 4° to 5°. If the sides of the clam are straight and have a perfect angle, durability and cutting efficiency will improve. , band saws can last a long time.

A conventional band saw side surface grinding finishing device is shown in FIGS. 4 and 5.

That is, the bandsaw 1 held by the clamps 5, 5'
Two grindstones 19, 19' directly attached to the shafts of the drive motors 18, 18' are symmetrically installed on both sides of the grinding wheel, tilted at a predetermined setting angle.
That is, the two drive motors 18, 18' are arranged in this way, and the supporting legs 17,
17' is erected so as to be swingable about the support shaft 6 on the stand 9.

On the other hand, a disc crank 1 rotated by a drive shaft 11
0 and a direct-acting cam 15 are connected by a continuous rod 13, and are arranged symmetrically on both side edges of the direct-acting cam 15 and come into contact with cam followers (bearing rollers) 16, 16' of the support legs 17, 17', which are driven joints. has been done. As shown in FIG. 5, the direct-acting cam 15 is formed into a trapezoidal shape with both side edges symmetrical and having the same inclination angle.

In other words, as the linear cam 15 reciprocates, the pair of grindstones 19 and 19' move symmetrically away from or toward each other, and in conjunction with this, the band saw 1 is intermittently fed vertically, resulting in Grinding the width of the side of the band saw is performed.

However, in the case of the above-mentioned conventional band saw side grinding finishing device, the cutting (feeding) of the grinding wheels 19, 19' is done at a constant speed regardless of rough cutting or finishing, which generates a lot of heat, which can lead to a decrease in the hardness of the stellite. The sharpness of the band tends to deteriorate, and the grindstones 19, 19' are subject to severe wear, requiring short replacement intervals, and daily maintenance is troublesome.

In addition, only certain surfaces of the grinding wheels 19 and 19' wear irregularly as they contact the side surface of the band saw, so the third
It was not only difficult to obtain the ideal set angle as shown in the figure, but also caused the inconvenience of uneven set ends. More specifically, the shape of the clam is rounded and the grinding is incomplete, making it impossible to take full advantage of Stellite's performance, and if it wears even a little, it becomes dull and cannot be used for a long time.
Since it had to be replaced three to four times a day, it was a cause of decreased productivity. Further, there were drawbacks in that the grinding curved, the grinding surface became poor, and the yield decreased.

(Objective of the Invention) Therefore, the object of the present invention is to perform flat width grinding in two stages: rough cutting and finishing, and to give a predetermined vertical feed to a pair of grinding wheels each time, thereby making wide use of the grinding wheel surface. We have developed a band saw side grinding finishing device that has been improved to have a configuration that enables ideal clam grinding, in other words, it can automatically perform sharp band saw side grinding with high precision, making full use of the performance of Stellite. It is about providing.

(Structure and Effects of the Invention) In order to achieve the above object, the band saw side surface grinding and finishing device of the present invention has one side portion in the direction of movement of the direct-acting cam as a wide inclined portion for rough cutting, and the middle portion as a parallel portion. The other side is formed as a finishing slope, and a pair of cam followers are brought into contact with both side edges of the linear motion cam in a symmetrical arrangement, and the cam followers are attached to the transverse feed mechanism of each motor stand. Then, two vertical feeding parts corresponding to the rough cutting and finishing inclined parts are formed on the disc cam that interlocks with the linear cam, and a cam follower that comes into contact with the periphery of the disc cam is attached to each motor stand. It has a configuration in which a motor installed on the top for vertical movement is attached to a common sliding vertical movement mechanism.

In other words, at the beginning of the forward stroke (or backward stroke) of the direct-acting cam, the same feed (horizontal feed) is applied to a pair of grinding wheels to perform the first stage of rough cutting, and at the same time, the same grinding wheels are reciprocated with a predetermined stroke vertically. Apply feed and use the grinding wheel surface widely to perform side grinding. Next, the horizontal feed is stopped for a certain stroke so that the grinding wheel lightly contacts the grinding surface, and then the feed is started again at the end of the forward stroke of the direct drive cam to perform the second stage of finish grinding, which is also carried out vertically. Apply feed and use the grinding wheel surface widely to perform side grinding.

Therefore, ideal clam grinding can be performed while suppressing the heat generation of the bandsaw (stellite) as much as possible. As a result, it is possible to grind the strips to be sharp and long-lasting, making full use of the performance of Stellite, and to avoid uneven clams. As a result, it is possible to perform band saw side grinding with a good sawing surface and high yield rate without causing any bending.

On the other hand, since local wear of the grinding wheel does not occur, its lifespan is long, and its replacement intervals are long, resulting in good work efficiency and easy maintenance management.

Next, the embodiment shown in FIG. 6 and subsequent figures will be explained.

A drive motor 1 is installed on both sides of a band saw (not shown, see FIGS. 4 and 5), which is the object to be cut.
Grinding wheels 19 and 19' are directly attached to the shafts of wheels 8 and 18'. The pair of grindstones 19, 19' are symmetrically installed at an angle at a predetermined ideal setting angle. That is, two drive motors 18,1
8' is placed at such an angle φ.

Furthermore, each drive motor 18, 18' is
Each underframe 36, 36' is slidably held vertically in groove-type vertical feed guides 8, 8', and the vertical feed guides 8, 8' are connected to transverse feed guides 7, 7' for transverse feed ( (Grinding incision) It is held slidably and allows minute adjustments in the lateral direction by adjusting screws 50, 50'.

The transverse feed guides 7, 7' are substantially configured as motor stands, and the lower ends of the support legs 17, 17' are erected so as to be swingable about the support shaft 6 on the stand 9. A stop bolt 21 is attached to the lower part of the two support legs 17, 17', and the tip thereof is configured to abut against the stopper receiver 22 (10th
figure). This is to make the width of the tab adjustable.

On the other hand, a connecting rod 13 is connected to a crank 10 that also serves as a disk cam and a direct drive cam 15 that is rotated at a constant speed by a drive shaft 11.
are connected. The support legs 17, 17', which are driven joints, are arranged symmetrically on both side edges of the translational cam 15.
The cam followers 16, 16' are in contact with each other.

The direct-acting cam 15 has a wide rough cutting inclined part 15a on the distal end side in the direction of movement, a parallel part 15b with a constant width in the middle, and a finishing inclined part 15c on the base end side.

The direct-acting cam 15 makes one reciprocating motion of a predetermined stroke with one revolution of the crank 10, and as the direct-acting cam 15 moves in the forward stroke (or inward stroke), cam followers are brought into contact with both side edges of the direct-acting cam 15. The supporting legs 17, 17 are moved via the support legs 16, 16', and in turn, the distance between the pair of grinding wheels 19, 19' is changed in two stages, a rough cut and a finishing cut, through the above-mentioned lateral feed mechanism. This makes it possible to grind the width of the clam.

The outer peripheral edge of the crank 10 is formed as a disc cam 10'. That is, at two predetermined rotation angle ranges relative to the position of the pin 12 to which the connecting rod 13 is connected, the same circular arc concave surfaces (vertical feed portions) 10a and 10b whose rotation radius gradually decreases and gradually increases are circular arc portions with a predetermined rotation angle. 10c. The radius of rotation of the other parts is constant.

The cam follower 3 of the swing lever 23, which is a driven joint, is in contact with the disc cam 10'. The swing lever 23 is attached to a support shaft 24 on the stand 9 that supports its lower end.
The circular concave surfaces 10a and 10b swing back and forth two times in total per rotation of the disc cam 10'.

A horizontal rod 26 is connected to the upper end of the swing lever 23 via a pin 25. The other end of the horizontal rod 26 is slidably passed through and supported by a holding frame 27 for preventing lateral vibration. A restraining coil spring 37 is connected between the holding frame 27 and the swing lever 23.

A horizontal rod 28 is attached and fixed approximately horizontally to the intermediate portion of the horizontal rod 26 in a direction approximately perpendicular thereto. Rods 30 are arranged symmetrically at both ends.
30' are connected. The other end of the rod 30, 30' is a tiltable rod 33, which is installed approximately vertically.
It is rigidly connected to 33'. Tilting rod 33,
33' is supported at its lower end so as to be tiltable about a support shaft 31 on the table 9. One end of a restraining coil spring 38, 38' stretched in the tilting direction is connected to the tiltable rod 33, 33'.

Above the tiltable rods 33, 33', height-adjustable rods 32, 32' are installed.
At the upper ends of the rods 32, 32', there is provided the tilting direction of the tiltable rods 33, 33', and the swinging rod 2.
Connecting rods 35, 35' protrude in the swinging direction of 3.
are attached, and the tips of the connecting rods 35, 35' are rigidly connected to the underframes 36, 36' on the motor stand. The protruding length of the connecting rods 35, 35' can be adjusted by a small amount using adjusting screws 40, 40'.

In other words, when the swinging rod 23 swings in accordance with the change in lift of the disc cam 10', the pair of grindstones 19, 19' are moved through the vertical feed mechanism to the pair of tiltable rods 33, 33'. Approximately in the longitudinal direction of
It is moved back and forth (vertical feed) with a stroke of 10 mm.

However, if the fixing bolt 39 attached to the horizontal rod 28 is screwed in and its tip is brought into contact with a fixing system (not shown), so that the cam follower 3 does not come into contact with the disk cam 10', the direct-acting cam 15
Grinding of the set width using a chisel will be performed.

Here, with reference to FIGS. 11 to 16, the related functions of the direct-acting cam 15 and the disc cam 10', and the manner in which the set width is ground by the functions of both, will be summarized as follows. .

First, in FIGS. 11A and 11B, the disc cam 10' rotates approximately 60 degrees clockwise, and as the direct-acting cam 15 moves forward in its forward stroke, the cam followers 16, 16' move to the rough cutting inclined portion 15a. This shows a stage in which the band saw 1 is starting to roughly cut the side surface of the stellite 2 as the grinding wheels 19 and 19' get closer together, and as a result, the distance between the pair of grinding wheels 19 and 19' (the gap width) narrows.

During this time, the cam follower 3 is not displaced, so no vertical feeding is performed.

Next, FIGS. 12A and 12B show a stage where the rotation angle of the disc cam 10' has further advanced by 45 degrees (total rotation angle 105 degrees). That is, from the end point Z ₁ of the rough cutting inclined portion 15a of the direct drive cam 15 to the cam follower 1
6 and 16' are brought into contact with the parallel portion 15b, and the first stage set width is determined and side surface grinding (rough cutting) is being performed.

At this time, the cam follower 3 for the disc cam 10' also comes into contact with the arcuate concave surface 10a, and the pair of grinding wheels 1
The first longitudinal reciprocating movement for the shafts 9 and 19' is being performed with a stroke of approximately 10 mm. That is,
The end point _Z1 of the rough cutting inclined portion 15a in the direct-acting cam 15 and the arcuate concave surface 10a in the disc cam 10'
is synchronized with the starting point _Y1 .

In other words, as shown in FIG. 12B, the pair of grindstones 19 and 19' are reciprocated (vertical feed) by 10 mm to the position indicated by the dotted line in the same figure, while keeping the determined first stage setting width. Then, side grinding is performed. Therefore, for stellite 2, grindstone 1
Since the grinding wheels 9 and 19' contact each other over a wide range of surfaces for grinding, local wear of the grinding wheels 19 and 19' can be prevented as much as possible, and the ideal shaped grinding shown in Figures 3A and B can be achieved with precision. Good and efficient grinding.

Next, FIGS. 13A and 13B show a stage where the disc cam 10' has a rotation angle of 150°. The direct-acting cam 15 has already moved forward by about 15 mm, and the cam followers 16, 16' are still in contact with _Z3 of the parallel portion 15b, maintaining the set width at the first stage. However, the cam follower 3 for the disc cam 10' has already passed through the first circular concave surface 10a and is in contact with the circular arc portion 10c having a constant radius. That is, the pair of grindstones 19, 19' are stopped at their original positions and perform side surface grinding.

Next, FIGS. 14A and 14B show a stage where the disc cam 10' has a rotation angle of 195°. That is, the direct-acting cam 15 has exceeded its forward limit (the point considered by the crank 10) and has entered its backward stroke a little. Cam follower 16,1
6' comes into contact with the finishing inclined portion 15c, the second stage set width is determined, and side surface grinding (finishing) is being performed.

At this time, the cam follower 3 for the disc cam 10' comes into contact with the second arcuate concave surface 10b, and the pair of grindstones 19, 19' are again given a vertical feed of about 10 mm. FIG. 14B shows the difference in set width between the first stage and the second stage and the mode of vertical feeding using solid lines and dotted lines.

The forward limit position of the direct-acting cam 15 and the intermediate position of the second arcuate concave surface 10b are synchronized.

Figures 15A and 15B show the rotation angle of the disc cam 10' at 240
Indicates the stage of ゜. The cam follower 3 has already passed through the arcuate concave surface 10b and is in contact with a portion with a constant radius, and the pair of grindstones 19, 19' are grinding the side surface with the set width determined by the finishing slope part 15c of the direct drive cam 15. I am doing it.

Figures 16A and B show the rotation angle 285 of the disc cam 10'.
Indicates the stage of ゜. The cam followers 16, 16' are brought into contact with the roughly maximum width position of the rough cutting inclined portion 15a, and the pair of grindstones 19, 19' are wide open in preparation for the next grinding.

Thus, according to the side surface grinding and finishing device of the present invention, irregular wear of the grindstones 19, 19' can be prevented, and side surface grinding can be performed in an ideal shape with constant set width and set angle. . Therefore, by making full use of the performance of Stellite, a band saw with good sharpness can be obtained, a band saw with good sawing texture and no bending can be obtained, and especially when used for the second table band saw, the labor is reduced. Helpful in alleviation.

In addition, regarding the grinding time, the saw width is 203 mm (8
What used to take 4 hours to grind a 17G) now only takes about 30 minutes, significantly reducing labor and costs.

[Brief explanation of the drawing]

Figures 1A and B are front and side views of the bandsaw before grinding, Figures 2A and B are front and side views of the bandsaw after grinding, and Figures 3A and B are ideal. 4 and 5 are front and plan views showing a conventional side surface grinding finishing device, and FIGS. 6 to 8 are a plan view and a front view showing a side surface grinding and finishing device of the present invention. Figures and side views, Figure 9 is a perspective view of the main parts, Figure 10
The figure is a simplified side view of the main parts, and FIGS. 11A and 11B to 16A and B are schematic process explanatory diagrams of the grinding work. 1... Saw, 15... Direct-acting cam, 15a... Rough cutting inclined part, 15b... Parallel part, 15c... Finishing inclined part, 16, 16'... Cam floor, 1
9,19'...Whetstone.

Claims (1)

[Claims] 1. Grinding wheels 19, 19' connected to motors 18, 18' are arranged symmetrically on both sides of the saw 1, and the distance between the pair of grinding stones 19, 19' is controlled by a direct drive cam. In a band saw side surface grinding and finishing device that performs set width grinding by changing the same based on the movement of the cam floor 15 and the corresponding movement of the cam floors 16 and 16', the linear motion cam 15 has one side in its movement direction. A wide inclined part 15a for rough cutting, and a parallel part 1 in the middle.
5b, and the other side is formed as a finishing slope part 15c, and a pair of cam followers 16, 16' are brought into contact with both side edges of the direct-acting cam 15 in a symmetrical arrangement, so that the cam followers 16, 16' A disc cam 10' is attached to the lateral feed mechanism of each motor 18, 18' and interlocks with the linear drive cam 15.
Two vertical feed portions 10a, 10b are formed in a relationship corresponding to the rough cutting and finishing inclined portions 15a, 15c of the linear drive cam 15, and the cam follower 3 is in contact with the peripheral edge of the disc cam 10'. is attached to a vertical feed mechanism that commonly slides motors 18 and 18' installed to allow vertical feed.