JP2002273644A - Grinding and polishing device for cutting blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding and polishing device for grinding and polishing a cutting blade of very small thickness used for a cutting device, etc., with high accuracy. SOLUTION: When a sensor means 7 detects the contact of a work W with a grinding wheel 5a, the grinding wheel 5a is set back by the predetermined quantity to suppress the elastic deformation caused by the contact of the work W with the grinding wheel 5a, and in this state, a control device A controls a tool 3 for holding the work W and the grinding wheel 5a to grind the work W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat blade-shaped cutting blade used for a cutting apparatus and the like, and more particularly, to grinding and polishing of a very thin cutting blade for cutting a thin plate-shaped work such as a ceramic laminate. And a grinding / polishing apparatus.

[0002]

2. Description of the Related Art A cutting blade for cutting a thin plate-like work such as a ceramic laminate is a very thin one having a shank portion of 1 mm or less in thickness, and a very thin one having a thickness of 0.4 mm or less. Exists.

[0003] Generally, this type of cutting blade is formed of a stainless steel material or a cemented carbide material, and whether a grindstone at the time of grinding the cutting execution portion (cutting target portion) at the tip end of the shank portion contacts the cutting execution portion. The judgment is made by artificial means using a magnifying glass. After visually detecting the contact of the grinding stone with the cutting unit using a magnifying glass, the movement of the grinding stone in the direction of the cutting blade is stopped, and the feed amount of the grinding stone in the direction perpendicular to the cutting blade is controlled and moved from that position. At the same time, the feed amount of the grindstone in the cutting direction is controlled and moved, and this is repeated to grind the cutting execution unit to a predetermined ultrathin thickness.

In such an artificial detection method using a magnifying glass, a setting operation for bringing a grindstone into contact with a cutting blade is extremely careful. In the setting work, in order to confirm the contact and perform the setting, the grinding work is sequentially performed from the state where a heavy load due to artificial contact is applied,
There is a problem that the cutting execution part is broken during the grinding due to the reaction force due to the load. In particular, when re-grinding a cutting blade that is worn with use, the above-described problem becomes remarkable because a region including a thinned cutting portion is re-ground.

Further, in the case of a thin plate-shaped work such as a ceramic laminate, a cutting blade for cutting a minute product having a vertical and horizontal dimension of 0.6 (mm) × 0.3 (mm) is required. In order to cut the work while maintaining the processing accuracy by pressing the work in a guillotine manner with a sharp V-shaped cutting blade in side view, where the cutting surfaces of both blades are formed with inclined surfaces, make the cutting edge angle smaller. It is necessary to minimize deformation of the cut surface of the workpiece. However, if the tip angle is made smaller without changing the thickness of the shank, it is natural that the area of the left and right sides of the blade surface becomes large, and the left and right sides become large resistance when cutting, and a large cutting force when cutting. Is required, and as a result, the blade edge portion undergoes buckling deformation. In order to prevent this, the cutting execution portion of the cutting blade is provided with a cutting edge portion having left and right surfaces formed by a concave concave curved surface or an inclined plane, and a cutting edge portion and a shank portion are connected to each other and are thickened toward the shank portion. It is only necessary to form a continuous portion in which the left and right surfaces are formed by one or a plurality of concave curved surfaces that are concavely continuous in the height direction (Japanese Patent No. 2993899).
issue). With such a configuration, the entire cutting thickness of the conventional cutting execution unit is smaller than that of a cutting blade formed by a sharp V-shaped blade surface in side view, and the cutting edge angle is smaller than that of the cutting blade. The contact resistance of the continuous portion (concave curved surface) can be suppressed to a small value, and the work can be cut with a small cutting force, so that buckling deformation of the cutting edge can be prevented.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to precisely grind a fine-thick cutting blade used in a cutting apparatus or the like.
An object of the present invention is to provide a grinding / polishing device for polishing.

[0007]

The technical means taken to solve the above-mentioned object is to detect contact between a workpiece supported by a jig and a grindstone for grinding / polishing the workpiece. And a control device that controls the grinding / polishing operation of the jig and the grindstone by receiving a detection signal output from the sensor means (claim 1). . The sensor means is provided on a means for detecting an electrical change caused by the contact between the conductive grindstone and the workpiece (claim 2) and a jig supporting the workpiece or the workpiece. Means (claim 3) for detecting vibration generated when the grinding stone contacts the workpiece is exemplified.

In the above technical means, since the contact between the grindstone and the cutting blade can be detected not artificially but electrically, high-precision grinding / polishing becomes possible. In the means for detecting vibration, Grinding and polishing can be performed without using an expensive conductive grindstone.

Further, when the control device detects the contact with the grindstone by the sensor means, the control device performs the grinding / polishing operation in a state in which the grindstone is backed by a predetermined amount and elastic deformation due to the contact of the workpiece with the grindstone is suppressed. It is more preferable to start (claim 4).

According to the above technical means, when the grinding stone comes into contact with the object to be machined, the object to be machined is slightly elastically deformed, and the elastic deformation stress is latent in the grinding / polishing operation and cracks in the cutting section. And damage such as breakage. In order to prevent this, the grinding / polishing operation is started on the object to be processed by moving the grinding wheel back by a predetermined amount. The predetermined amount is an elastic deformation amount generated when the grindstone comes into contact with the workpiece, and is input to the control device as an actually measured value in advance.

Further, the object to be processed by the grinding / polishing apparatus according to any one of claims 1 to 4 is a thin cutting blade, and the cutting blade has a cutting edge portion as a cutting execution portion; A connecting portion for connecting the cutting edge portion and the shank portion to each other, wherein the cutting edge portion is formed of a left and right surface formed of a concave curved surface or an inclined plane that is concave in a height direction, and the connecting portion includes a cutting edge. Part and a shank part are continuously formed and formed on the left and right surfaces formed of a single step or a plurality of continuous concave curves in the height direction that becomes thicker toward the shank part, and the concave curved surface or the inclined plane of the cutting edge portion. The concave curved surface of the continuous portion may be re-ground.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a grinding / polishing apparatus for a cutting blade according to the present invention will be described. FIGS. 1 to 3 show a first embodiment, and FIG. Are respectively shown. In the present embodiment, as the workpiece W,
As shown in FIG. 3, a cutting edge portion 11 as a cutting execution portion 1, and a continuous portion 21 that connects the cutting edge portion 11 and a shank portion 31 to each other.
And the cutting edge portion 11 has inclined planes 11a, 11a which are symmetrical with respect to the center line X, and the connecting portion 21 connects the cutting edge portion 11 and the shank portion 31 in a continuous manner. A cutting blade grinding / polishing device having one or more concave curved surfaces 21a, 21a symmetrical with respect to a center line X continuously formed concavely in the height direction so as to gradually increase in thickness toward the first is provided. This is shown as an embodiment. In this cutting blade, the blade thickness of the blade edge portion 11 and the blade thickness formed by the pair of left and right concave curved surfaces 21 a and 21 a of the continuous portion 21 are respectively:
A part slightly thinner than the maximum blade thickness at the lower stage is formed in the middle part, and then the thickness at the upper stage is gradually increased. still,
In the cutting blade, the blade thickness of the blade edge portion 11 and the blade thickness formed by the pair of left and right concave curved surfaces 21a and 21a of the continuous portion 21 are each cut through a portion that is slightly thinner than the lower maximum blade thickness. It is also possible to adopt a form in which the thickness of the upper blade is gradually increased without being formed in the portion.

An apparatus for grinding / polishing a strip (hereinafter, denoted by a reference symbol W) made of a stainless steel material or a cemented carbide material as the workpiece W is controllably movable in the X-axis direction. A jig 3 that is provided on the table 2 and holds the strip W, and a support 4 that is controllably movable in a direction perpendicular to the strip W, that is, in the Y-axis direction, are exchangeably mounted together with a drive source. Cup-type grindstone 5a or grinding wheel 5b, an actuator 6 such as an air cylinder for vertically moving the table 2 together with a moving mechanism 12 in the X-axis direction, and a strip W
And a sensor means 7 for detecting contact with the cup-type grindstone 5a or the grinding wheel 5b. The sensor means 7, a driving source of the moving mechanism 12 of the table 2, a driving source of the moving mechanism 14 of the support table 4, and a cup type The drive source, the actuator 6 and the like of each of the grinding wheel 5a and the grinding wheel 5b are both linked to the control device A and are assembled in the machine body B as shown in FIG.

The cup-shaped grindstone 5a or the grinding wheel 5b is a well-known one having conductivity, and the cup-shaped grindstone 5a
Is, as shown in FIG.
3 is ground on the front surface of the symmetrical inclined plane 11a, and the grinding wheel 5b is connected to the connecting portion 2 as shown in FIG.
The first concave curved surfaces 21a, 21a are ground on the peripheral surfaces thereof. The sensor means 7 forms an electric circuit between the cup-shaped grindstone 5a or the grinding wheel 5b and the strip W made of stainless steel or cemented carbide material. When a current is generated in the electric circuit, the current detector 17 detects an electric change due to the electric connection between the cup-type grindstone 5a or the grinding wheel 5b and the strip W. This detection signal is transmitted to the control device A.

The control device A has a RAM as its storage unit.
When the detection signal is received, the driving source of the moving mechanism 14 for moving the support base 4 in the Y-axis direction is controlled to move the cup-type grindstone 5a or the grinding wheel 5b by a predetermined amount. The amount data and predetermined feed amount data for moving the support table 4 in the Y-axis direction during grinding are stored, and the drive unit of the moving mechanism 12 of the table 2 and the moving mechanism of the support table 4 are stored in the ROM via each interface. 14
And a predetermined program for controlling an actuator 6 for vertically moving the table 2 together with a drive mechanism 12 for moving the table 2 together with the moving mechanism 12 in the X-axis direction.

The back amount data is obtained when the detection signal is transmitted to the control device A, that is, when the cup-shaped grindstone 5a or the grinding wheel 5b comes into contact with the thin plate-shaped workpiece W. The amount of elastic deformation of W is an actually measured value obtained by performing image processing on image data of a CCD camera.
Cup type grinding wheel 5a and grinding wheel 5b for this back amount data
With the retreat, the elastic deformation of the band plate W cannot be completely absorbed, but can be suppressed to an extremely small extent.

Therefore, in this embodiment, FIG.
As shown in FIG. 3 and FIG. 3, the drive source of the cup-type grindstone 5a and the grinding wheel 5b, the drive source of the moving mechanism 14 of the support table 4, and the drive source of the moving mechanism 12 of the table 2 are controlled, respectively.
a, while rotating and driving the grinding wheel 5b, the grinding wheel 5b is advanced from a direction orthogonal to the strip W, and when the current is detected, the grinding wheel 5b is moved.
a, the rotation of the grinding wheel 5b is stopped, and under the control of the controller A, the grinding wheels 5a, 5b are backed by a predetermined amount, and the grinding wheels 5a,
Each time the grinding wheels 5a, 5b move in the Y-axis direction in accordance with predetermined grinding program data, the elastic deformation generated in the strip W by contact with the grinding wheel 5b is extremely small.
The predetermined grinding is executed by controlling the moving mechanism 12 of the table 2 in the X-axis direction. When the grinding of one side is completed, the strip W is removed from the jig 3 and held in the opposite direction, and the other side is similarly ground. The actuator 6 allows the blade edge portion 11 to correspond to the cup-shaped grindstone 5a,
1 is controlled to correspond to the grinding wheel 5b.
When grinding the symmetric inclined plane 11a, the cup-shaped grindstone 5a shown in FIGS. 1 and 2 is used. use. If the cutting edge 11 is not a symmetric inclined plane with respect to the center line X but a symmetric concave curved surface, the grinding is performed using the grinding wheel 5b.

Next, a second embodiment shown in FIG. 4 will be described. In the second embodiment, the above-mentioned cup-type grindstone 5a and grinding wheel (not shown) are used as the sensor means 7. A case is shown in which a vibration sensor that detects vibration generated when the workpiece W comes into contact with the workpiece W is used.

The sensor means 7 is attached to the shank portion 31 of the strip W or the holder 13 of the jig 3 so that the cup-type grindstone 5a and the grinding wheel (not shown) are connected to the strip W.
Is connected to the control device A via an amplifier 37 that amplifies the detection signal to a vibration sensor 27 that outputs a detection signal when it comes into contact with.

When a frequency equal to or greater than the predetermined amplitude is received by the amplifier, the control device A controls the moving mechanism 14 of the support base 4 to control the cup 14 in the same manner as in the first embodiment. A predetermined back amount data for backing the mold grindstone 5a and the grinding wheel (not shown) by a predetermined amount;
And the predetermined feed amount data for feeding the
The drive unit of the moving mechanism 12 of the table 2 and the moving mechanism 14 of the support 4
Drive unit, cup type grinding wheel 5a or grinding wheel (not shown)
A predetermined program for controlling the driving source, the actuator 6 and the like is stored in the ROM.

The procedure of grinding using the second embodiment is the same as that of the first embodiment, so a detailed description is omitted, but in the case of this embodiment, It is possible to use a cup-type grindstone 5a and a grindstone wheel 5b that do not have conductivity.

The present invention is applicable not only to the case where a cutting blade is ground from a strip W made of a stainless steel material or a cemented carbide material, but also to the two blades of a cutting blade constituting a cutting execution part with a V-shaped blade surface in side view. The present invention also includes a grinding device for re-grinding the concave curved surface of the continuous portion of the cutting blade, the inclined plane of the cutting edge portion, and the concave curved surface as well as the surface. Although not shown, at the time of re-grinding, the table 2 itself provided with the jig 3 is vertically controlled and moved by the actuator 6 to make the cup-shaped grindstone 5a correspond to the inclined plane 11a of the cutting edge portion 11, or the like. Grinding wheel 5b
The concave curved surface 21a of the connecting portion 21 and the concave curved surface of the cutting edge portion 11 correspond to the drive sources of the cup grindstone 5a and the grinding wheel 5b.
The moving mechanism 14 of the support base 4 and the moving mechanism 12 of the table 2 are controlled to move the grinding wheel 5a and the grinding wheel 5b in a direction perpendicular to the cutting blade while rotating and driving the same. The rotation of the grindstones 5a and 5b is stopped and controlled by the controller A. The grindstones 5a and 5b are backed by a predetermined amount, and the elastic deformation generated on the cutting blade by contact with the grindstones 5a and 5b is extremely small. And then the grinding wheel 5a and the grinding wheel 5b are set to Y in accordance with predetermined grinding program data.
Each time the table 2 is moved in the axial direction, the moving mechanism 12 of the table 2 is controlled in the X-axis direction to regrind the corresponding concave curved surface 21a and inclined plane 11a.

The present invention is equally useful for polishing a cutting blade made of stainless steel or cemented carbide,
In this case, the sensor means 7 uses the grinding wheels 5a and 5
When the contact with the grinding wheel is detected, the grindstones 5a and 5b are backed by a predetermined amount based on the predetermined back amount data to suppress the elastic deformation of the workpiece W due to the contact with the grinding stone. Each time the grindstone moves in the Y-axis direction according to the polishing program data, the moving mechanism 12 of the table 2 is controlled in the X-axis direction.

[0024]

As described above, according to the present invention, the sensor means for detecting the contact of the grindstone with the workpiece is provided, and the output from the sensor means controls the jig and the grinding / polishing operation of the grindstone. When grinding and polishing the cutting blade, high-precision positioning can be performed, and the positioning operation can be greatly improved as compared with the related art. In addition, by adopting a configuration in which vibration generated when the grinding stone comes into contact with the workpiece is detected, grinding and polishing can be performed without using an expensive conductive grinding stone, and the apparatus cost is low. Moreover,
When the control device detects the contact with the workpiece by the sensor means, it is controlled so that the grindstone is backed by a predetermined amount and elastic deformation due to the contact of the workpiece with the grindstone is minimized. In particular, there is little risk of causing damage such as cracks or breaks to the cutting execution part due to latent elastic deformation stress, especially when grinding and polishing ultra-thin cutting blades as well as re-grinding the cutting blade. It is valid.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a first embodiment.

FIG. 2 schematically shows a state in which the cutting edge of the cutting blade is being ground on the side surface.

FIG. 3 is an enlarged side view showing a state where the concave curved surface of the continuous portion of the cutting blade is being ground.

FIG. 4 is a side view of the second embodiment, schematically showing a state where a cutting edge of a cutting blade is being ground.

[Explanation of Symbols] 7: Sensor means 3: Jig 5a: Cup-type grindstone 5b: Grinding wheel W: Work piece (strip) A: Control device 1: Cutting unit 11: Blade unit 31: Shank unit 21 : Consecutive part 21a: Concave curved surface 11a:
Inclined plane X: center line

Continuation of the front page F term (reference) 3C058 AA02 AA09 AA11 AA14 AA16 AB01 AB04 AB06 AB09 AC02 BA07 BC05 CA02 CB01 DB10

Claims (5)

[Claims] 1. A sensor for detecting contact between a strip-shaped workpiece to be processed supported by a jig and a grindstone for grinding and polishing the workpiece is provided, and a detection output from the sensor is provided. A cutting blade grinding / polishing device, which is linked to a control device which controls a grinding / polishing operation of a jig and a grindstone by receiving a signal. 2. The cutting device according to claim 1, wherein the grinding wheel is a conductive grinding wheel, and the sensor unit detects an electrical change caused by contact between the conductive grinding wheel and the workpiece. Blade grinding and polishing equipment. 3. The apparatus according to claim 1, wherein said sensor means is provided on a workpiece or a jig for supporting the workpiece, and detects vibrations generated when the grinding stone comes into contact with the workpiece. A grinding / polishing device for the cutting blade described in the above. 4. The control device according to claim 1, wherein when the sensor unit detects the contact with the grindstone, the control unit backs the grindstone by a predetermined amount to grind and polish the workpiece in a state in which elastic deformation due to the contact with the grindstone is suppressed. 3. An operation is started.
4. A grinding / polishing device for a cutting blade according to claim 3. 5. An object to be processed by the grinding / polishing apparatus according to any one of claims 1 to 4, wherein the object to be processed is a thin cutting blade, and the cutting blade has a cutting edge as a cutting execution unit. A continuous portion that connects the blade tip portion and the shank portion to each other, wherein the blade tip portion is formed of a concave curved surface or an inclined plane that is concave in the height direction, and the continuous portion is The blade edge portion and the shank portion are continuously formed and formed on the left and right surfaces formed of a single step or a plurality of continuous concave concave surfaces in the height direction that becomes thicker toward the shank portion, and the concave curved surface or the inclination of the blade edge portion. A grinding and polishing apparatus for a cutting blade, wherein a flat surface and each concave curved surface of a continuous portion are re-ground.