JP3862014B2 - Drill grinding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drill grinding apparatus.
[0002]
[Prior art]
Grinding work of the cutting edge of a drill is generally performed using a drill grinder, but it requires very skill in positioning the drill, and the grinding work requires manual skill of the operator to perform manually. . In particular, when performing thinning to improve chip discharge from the center, the above drill grinder determines the phase of the cutting edge with the naked eye, so it is very difficult to perform thinning with high accuracy. It is difficult to.
[0003]
In view of this, an automatic drill grinding machine has been proposed that can perform grinding processing including thinning processing of a drill edge with a simple operation (see Patent Document 1). This automatic drill grinder includes a rotating grindstone, a grindstone moving means (grinding wheel tilting means), a chuck, a chuck rotating means, a chuck indexing means, a chuck moving means, a drill edge detection sensor, and an input grinding. Control means comprising storage means for storing condition parameters, calculation means for executing calculations based on the input grinding condition parameters, and signal transmission means for transmitting control signals based on the input grinding condition parameters; And a servo mechanism that operates the grindstone moving means, the chuck rotating means, and the chuck indexing means based on a control signal from the control means.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-217073
[0005]
[Problems to be solved by the invention]
However, the automatic drill grinding machine disclosed in the above publication cannot grind a steel drill having a pilot cutting edge at the tip. In addition, it is necessary to input a number of parameters such as drill diameter, core thickness ratio, grinding allowance, clearance angle, second clearance angle, clearance surface shape, presence / absence of thinning, thinning depth, and thinning width as grinding condition parameters. There are problems such as troublesome operation.
[0006]
The present invention has been made in view of the above points, and an object of the present invention is to provide a drill grinding apparatus capable of automatically grinding a drill having a pilot cutting edge provided at the tip.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a drill grinding apparatus is a drill grinding apparatus for grinding a cutting edge of a drill having a pilot provided at a tip and a pilot cutting edge, and is disposed on a base. An X-axis table that can move horizontally in the X-axis direction, a Y-axis table that is arranged on the base and can move horizontally in the Y-axis direction perpendicular to the X-axis direction, and is arranged perpendicular to the Y-axis table A Z-axis table movable in the Z-axis direction orthogonal to the X-axis and Y-axis directions, and an indexing spindle having a function of chucking the drill disposed horizontally on the Z-axis table and parallel to the X-axis direction A grindstone shaft table disposed on the X-axis table and capable of horizontally turning from a position orthogonal to the drill to a predetermined angular position, a grindstone shaft motor disposed on the grindstone shaft table, and an outer periphery And the outer peripheral surface of the base end portion connected to this has a shape corresponding to the tip angle of the drill and the tip angle of the pilot, the rotating grindstone fixed to the rotating shaft of the grindstone shaft motor, each table, the indexing spindle, And a control means for controlling the grindstone shaft motor, rotating the drill, rotating the rotary grindstone to rotate around the pilot root while contacting the cutting edge and pilot cutting edge of the drill, The cutting edge of the drill, the pilot cutting edge, and the flank are ground simultaneously.
[0008]
The drill grinding machine is equipped with a drill with a pilot at its tip mounted on the indexing spindle and rotated. The outer peripheral surface and the outer peripheral surface of the base end connected to the drill are shaped according to the tip angle of the drill and the pilot tip angle. Rotating the rotating whetstone that drives the X-axis table, Y-axis table, Z-axis table, and whetstone axis table, with the rotating whetstone in contact with the drill cutting edge and pilot cutting edge, centering on the pilot root Rotate and grind the drill edge, pilot edge and flank simultaneously.
[0009]
According to a second aspect of the present invention, the X-axis table moves forward at a high speed until the rotating grindstone comes into contact with the tip of the drill. Grinding is started with a grindstone.
As a result, the cutting edge of the drill can be efficiently ground.
According to a third aspect of the present invention, the rotary grindstone is characterized in that a flange is formed at the peripheral edge of the tip, and the drill is thinned by the peripheral edge of the flange.
[0010]
The invention of claim 4 is characterized in that the thinning grinding is performed after the grinding of the cutting edge and the pilot cutting edge.
Thereby, it is possible to perform grinding of a cutting edge, a pilot cutting edge, and a thinning of a drill in which a pilot is provided at the tip with one rotating grindstone.
In a fifth aspect of the present invention, the drill grinding apparatus according to the first aspect of the present invention includes a first sensor that detects a tip of the drill, a second sensor that detects a diameter and a cutting edge of the drill, and processing of the drill. An input means for inputting a removal length; and the control device includes a storage means for storing machining data and a machining program corresponding to a diameter of a drill to be machined, the inputted machining removal length, and each of the sensors. On the basis of this signal, predetermined machining data is read from the storage means to control each table, indexing spindle and grindstone shaft motor.
[0011]
The drill grinding device can perform grinding of the cutting edge, pilot cutting edge, and thinning simply by inputting the machining removal length of the drill.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
1 is a perspective view showing an embodiment of a drill grinding apparatus according to the present invention, FIG. 2 is a front view of the drill grinding apparatus shown in FIG. 1, and FIG. 3 is a right side view of the drill grinding apparatus shown in FIG. is there. 4 is a plan view of the drill grinding apparatus shown in FIG.
[0013]
As shown in FIGS. 1 to 4, the base 2 of the drill grinding apparatus 1 has an L shape in plan view, the base 2a on one side extends in the X-axis direction, and the base 2b on the other side is orthogonal to the X-axis direction. The X-axis table 3 is disposed on the base 2a, the Y-axis table 4 is disposed on the base 2b, and the rear end of the Y-axis table 4 (hereinafter referred to as “Z-axis direction”) extends in the Y-axis direction. A Z-axis table 6 is disposed on a base 5 that is vertically suspended.
[0014]
The X-axis table 3 is moved horizontally in the X-axis direction by LM guides 7 and 7, a drive motor (hereinafter referred to as “X-axis motor”) 8 (FIG. 3), and an X-axis feed screw 9 (FIGS. 1 and 4). It is supposed to be free. The Y-axis table 4 is movable horizontally in the Y-axis direction by LM guides 11, 11, a drive motor (hereinafter referred to as “Y-axis motor”) 12, and a Y-axis feed screw 13. The Z-axis table 6 is movable vertically in the X-axis direction and the Z-axis direction orthogonal to the Y-axis direction by the LM guides 14, 14, the drive motor (hereinafter referred to as “Z-axis motor”) 15, and the Z-axis feed screw 16. It is said that.
[0015]
The grindstone shaft table 17 has an arc shape on the X-axis table 3, R guides 18 and 18 arranged concentrically around a point O in FIG. 4, and a drive motor (hereinafter referred to as “swing motor”) 19, The feed screw 20 (FIGS. 1 and 4) is disposed so as to be pivotable in the direction of arrow C from a position parallel to the Y axis (perpendicular to the X axis) in a horizontal plane to a predetermined angular position. A grindstone drive motor 21 is disposed on the grindstone shaft table 17. The rotating shaft 22 of the grindstone driving motor 21 is a grindstone shaft (hereinafter referred to as “grinding wheel shaft 22”), and the rotating grindstone 23 is fixed to the tip thereof.
[0016]
The indexing spindle 24 is disposed horizontally on the Z-axis table 6 and parallel to the X-axis, and drives a workpiece rotating shaft 26 of the chuck 25 above the indexing spindle 24 device (hereinafter referred to as “work rotating shaft motor”). 27) is arranged in parallel with the workpiece rotation axis 26. A toothed pulley 26 a (FIG. 2) of the work rotation shaft 26 is connected to a toothed pulley 27 a of the work rotation shaft motor 27 via a toothed belt 28. The grindstone shaft 22 can move horizontally in the X-axis direction and can turn in the direction of arrow C from a position parallel to the Y-axis (a position orthogonal to the X-axis) to a predetermined angular position in the horizontal plane. The work rotation shaft 26 is parallel and parallel to the X axis, and can be translated in the Y axis and Z axis directions.
[0017]
The rotary grindstone 23 is formed in a shape corresponding to the cutting edge of a drill to be ground, for example, a steel drill 100. As shown in FIG. 5, the steel drill 100 is formed such that a pilot 101 protrudes from the tip, and a thinning 102 is provided from the tip of the groove 100 b to the tip of the pilot 101 to form a cutting edge 101 a of the pilot 101. The tip angle formed by the cutting edge 101a of the pilot 101 is smaller than the tip angle of the cutting edge 100a.
[0018]
The rotating grindstone 23 simultaneously grinds or creates the cutting edge 100a of the steel drill 100 and the cutting edge 101a of the pilot 101, and further grinds or creates the thinning 102. The rotating grindstone 23 has a bottomed cylindrical shape (FIG. 10), and is reduced in weight and material saving. As shown in FIG. 4, the outer peripheral surface 23 a of the rotary grindstone 23 tapers at a predetermined angle from the open end side to the base end side (bottom) with respect to the center of the grindstone shaft 22 according to the tip angle of the drill 100. The outer peripheral surface 23b of the base end portion is predetermined with respect to the center of the grindstone shaft 22 in accordance with the tip angle of the pilot 101. The peripheral portion 23c of the flange formed on the outer peripheral surface of the opening end is formed into a grinding portion (hereinafter referred to as “grinding portion 23b”) for grinding the pilot cutting edge 101a by reducing the diameter to a taper shape. It is a grinding part (hereinafter referred to as “grinding part 23c”). And the connection part (ridgeline) of the grinding parts 23a and 23b is made into the shoulder part 23d.
[0019]
As shown in FIG. 4, a shoulder portion 23 d that is circular in the vertical plane of the rotating grindstone 17 is in contact with a vertical line passing through the turning center O of the grindstone shaft table 17, and the contact point P is a processing reference point P of the rotating grindstone 23. And The rotating grindstone 23 turns in the direction of arrow C in the horizontal plane around the processing reference point P as the grindstone shaft 22 turns. Then, the connecting portion of the flank 100 c of the drill 100 and the flank 101 c of the pilot 101, that is, the root portion 101 d (FIG. 5) of the pilot 101 is positioned at the processing reference point P and contacts the shoulder 23 d of the rotary grindstone 23. The cutting edges 100a and 101a can be ground (grinded) simultaneously, and the flank surfaces 100c and 101c can be ground (grinded) simultaneously by turning the grindstone shaft table 17.
[0020]
1 to 3, a cover (not shown) is detachably attached to the rotating grindstone 23, and a length detection sensor 31, a blade edge detection sensor 32, and an operating piece of the drill 100 are attached to the cover via a bracket 30. A drill detecting means 35 comprising 33 is arranged slightly outside the grinding portion 23 c of the rotating grindstone 23 and closer to the Y-axis table 4.
As shown in FIG. 5, the operating piece 33 has a plate shape, and the base end of the vertical portion 33a is supported by the hinge 30 with a spring so as to be vertically rotatable, and the base end portion of the upper end is horizontal to one side. It is bent into a detection part 33b, and is bent horizontally to the other side from the tip to the vicinity of the detection part 33b to form a reinforcement part 33c. The operating piece 33 is parallel to the Y axis as indicated by a solid line in a normal state, and the tip of the pilot 101 of the drill 100 hits the vertical portion 33a and is pushed against the spring force of the spring. It rotates in the direction of the arrow as shown by the dotted line.
[0021]
The length detection sensor 31 is a non-contact sensor, for example, an electromagnetic sensor, and is vertically arranged slightly spaced above the detection portion 33 b of the operating piece 33, and the vertical portion 33 a is a pilot of the drill 100. The edge portion 33b ′ of the detecting portion 33b is detected when the tip portion 101 is pushed and slightly rotated by the tip of 101.
The blade edge detection sensor 32 is an electromagnetic sensor similar to the length detection sensor 31, on the center line of the workpiece rotation shaft 26 (drill 100) near the Y-axis table 4 (recessed position) outside the length detection sensor 31. And the tip is positioned slightly above the length detection sensor 31 and arranged vertically, and the diameter of the drill 100 and the shoulder (edge of the cutting edge) 101d are arranged. (FIG. 5) is detected.
[0022]
The drill grinding apparatus 1 is housed in a housing, and an operation panel, a display screen, and a control device (all not shown) are arranged in the housing. The control device includes a CPU and a storage device. The storage device includes grinding conditions such as a grinding allowance, a grinding speed, a core thickness according to a drill diameter, a clearance angle, a clearance surface shape, a thinning depth, and a thinning width. Data and these machining programs are stored, and the CPU inputs signals from the machining removal length, length detection sensor 31 and blade edge detection sensor 32 input from the operation panel, and the X-axis motor 8 , Y-axis motor 12, Z-axis motor 15, turning motor 19, grindstone shaft motor 21, work rotation shaft motor 27, and the like are controlled. Each of these motors is a stepping motor.
[0023]
The operation will be described below with reference to the flowcharts showing the grinding procedure of FIGS.
When the power switch of the operation panel is turned on, the drill grinding apparatus 1 is released from the emergency stop, and the X-axis table 3, the Y-axis table 4, the Z-axis table 6, and the grindstone axis table 17 are automatically automatically returned to the home position sequentially. (Step S1 to Step S3 in FIG. 13), and a display screen is displayed (Step S4). In the state where the origin is returned, the grindstone shaft 22 is orthogonal to the X-axis as shown in FIGS. Next, after the operator attaches the drill 100 to the chuck 25 of the index spindle 24 (step S5), the machining removal length (grinding amount) is set by the operation panel (step S6), and the cycle start button is turned on (ON). Then, processing is started (step S7, step S8).
[0024]
The machining process includes drill detection, blade edge detection, blade grinding (grinding), and thinning grinding (grinding). First, drill detection is executed. In the drill grinding apparatus 1, the Y-axis table 4 is moved in the direction of the arrow −Y by the control device as shown in FIG. 2, and the extension line of the center axis of the drill 100, that is, the workpiece rotation axis 26 is directly below the blade edge detection sensor 32. The Z-axis table is moved to + Z (upward), and the workpiece rotation shaft 26 is positioned at the same height as the grindstone shaft 16. In this state, the extension line of the work rotation shaft 26 is orthogonal to the grindstone shaft 22. This position is the processing origin.
[0025]
Next, the X-axis table 3 moves forward (skips) at high speed in the arrow -X direction (step S11 in FIG. 14), and the operating piece 33 comes into contact with the tip of the pilot 101 of the drill 100 and resists the spring force of the spring. When the length detection sensor 31 detects the edge 33b ′ of the detection portion 33b of the operating piece 33 by slightly rotating as shown in FIG. 5 and the position indicated by the two-dot chain line in FIG. 5, the X-axis table 3 stops. Next, the X-axis table 3 moves slightly backward in the + X direction and stops and then moves again in the −X direction at a low speed. The operating piece 33 comes into contact with the tip of the pilot 101, and the length detection sensor 31 moves to the operating piece 33. When the edge 33b ′ is detected, the X-axis table 3 stops (step S12). The said control apparatus measures the length of the drill 100 from the movement distance until the X-axis table 3 stops from an origin. The control device can accurately measure the length of the drill by performing the operations of steps S11 and S12.
[0026]
Next, the drill diameter is measured. The blade edge detection sensor 32 can measure the diameter of the drill by being disposed at a position deeper from the tip of the drill 100 than the length detection sensor 31. The control device slightly moves the X-axis table 3 in the + X direction to separate the operating piece 33 from the tip of the pilot 101a, and then rotates the work rotation shaft (A-axis) 26 to detect the diameter of the drill 100. (Step S13), the Z-axis table 6 is moved (raised) in the + Z direction at high speed (Step S14). By slightly separating the tip of the pilot 101 from the operating piece 33, the pilot 101 is prevented from opening a hole in the operating piece 33 when the drill 100 is rotated.
[0027]
The blade edge detection sensor 32 is turned on when the outer peripheral surface of the drill 100 comes close to a predetermined distance (about 0.5 mm), and the Z-axis table 6 stops. Next, after the Z-axis table 6 slightly moves (lowers) in the −Z direction and stops, it moves again in the + Z direction at a low speed and comes close to the predetermined distance from the blade edge detection sensor 32 to turn on the blade edge detection sensor 32. Then, the Z-axis table 6 stops (step S15). The control device measures the diameter of the drill 100 based on the moving distance from the processing origin position to the stop position of the Z-axis table 6. As described above, the drill diameter can be accurately measured by performing the operations of steps S14 and S15. The control device measures the drill diameter and reads out processing data corresponding to the drill 100 from the storage device.
[0028]
Next, the control device determines whether or not the forming grinding amount has been input (step S16). When it has not been input (= 0), the control device proceeds to step S25 in FIG. > 0), the process proceeds to step S17 to perform pre-grinding. In pre-grinding, when the shoulder 100d of the drill 100 is damaged, the pilot 101 and the cutting edges 100a and 101a are newly formed (created) by grinding from the tip to the damaged position. This pre-grinding will be described later.
[0029]
The control device detects the cutting edge of the drill 100 in step S25. As shown in FIGS. 7A and 7B, the control device rotates the drill 100 (work rotation shaft 26) at a low speed, moves the X-axis table 3 at a high speed in the + X direction, and the blade edge detection sensor 32 moves the drill 100. When the X-axis table 3 is turned off when it is turned off from the shoulder portion 100d, the X-axis table 3 is moved in the -X direction at a low speed, and the blade edge sensor 32 is moved to the shoulder as shown in FIGS. 7 (c) and 7 (d). When the part 100d is detected again, the rotation of the A-axis is stopped and the X-axis table 3 is stopped. Thereby, the shoulder part 100d can be accurately detected. At this time, as shown in FIG.7 (d), the shoulder part 100d is located right above, and the cutting edge 100a of the drill 100 is vertical. Then, the control device determines the cutting edge position and specifies the grinding start point.
[0030]
Next, the workpiece rotating shaft 26 was rotated so that the cutting edge 100a of the drill 100 was set slightly obliquely downward from the horizontal position according to the taper angle of the grinding portion 23a of the rotating grindstone 23 as shown in FIG. In step S26, blade grinding (grinding) is performed. By setting the cutting edge 100a to a slightly obliquely lower position from the horizontal position according to the taper angle of the grinding part 23a of the rotating grindstone 23, the grinding parts 23a and 23b can be accurately brought into contact with the cutting edges 100a and 101a. . In step S26, the control device moves the X-axis table 3 in the -X direction as shown in FIG. 10, and the root portion 101d on one side of the pilot 101 of the Y-axis table 4 corresponds to the shoulder portion 23d of the rotating grindstone 23. Move in the -Y direction to the position.
[0031]
Next, the control device moves the X-axis table 3 in the −X direction at a high speed while rotating the rotary grindstone 23 as shown in FIG. 11, so that the grinding parts 23 a and 23 b have a cutting edge 100 a on one side of the drill 100. , Detecting that a load has been applied from the current change of the grindstone drive motor 21 at the moment of contact with the 101a, detecting that the rotary grindstone 23 has contacted the cutting edge 100a of the drill 100 and the pilot cutting edge 101a, The X-axis table 3 is advanced at a low speed to start grinding (grinding).
[0032]
In this grinding, the X-axis table 3 is rotated at a low speed in the direction of arrow A by a predetermined angle (for example, 60 °) from the cutting edge 100a to the end position of the flank 100c from the cutting edge 100a. The grindstone shaft 22, that is, the rotary grindstone 23 is turned in the direction of arrow C around the shoulder 23 d as a processing reference point, the Y-axis table 4 is moved in the −Y direction, and the Z-axis table 6 is moved to − Move in the Z direction (downward). The control device performs the 5-axis control simultaneously. By this series of operations, grinding of the cutting edge 100a of the drill 100 and the cutting edge 101a of the pilot 101, flank faces 100c and 101c (FIG. 5), and grinding of the flank clearance angle are simultaneously performed. In this way, the cutting edge 100a on one side of the drill 100 and the cutting edge 101a of the pilot 101 are ground.
[0033]
Next, the X-axis table 3 is moved in the + X direction to separate the rotary grindstone 23 from the drill tip, the grindstone shaft 22 is returned to its original position, and the drill 100 (workpiece rotation shaft 26) is rotated 180 ° to After the opposite root portion 101d is made to face the shoulder 23d of the rotating grindstone 23, the X axis table is moved in the -X direction while the drill 100 is rotated again in the direction of arrow A to the predetermined angle at a low speed, and the grindstone is moved. The shaft 22 is turned in the arrow C direction, the Y-axis table 4 is moved in the -Y direction, the Z-axis table 6 is moved in the -Z direction (downward), and the cutting edges 100a and 101a are ground, flank and clearance angle. Grinding at the same time. Such operations are sequentially repeated until the inputted machining removal length is performed, and predetermined cutting edge grinding is performed on the cutting edges 100a and 101a of the drill 100. In the above processing, the number of roughing operations is automatically calculated and executed by the entire processing length and 1-pass cutting, except for one finishing processing.
[0034]
Next, thinning grinding of the cutting edge 101a of the pilot 101 is performed. First, in step S27, the same operation as in steps S1 and S2 shown in FIG. 13 is performed to detect the cutting edge. This is because the length of the drill 100 is shortened by grinding the cutting edges 100a and 101a in step S26, and the shortened portion is corrected. That is, in thinning grinding, the accuracy of indexing of the cutting edge 101a and the pilot 101 is expected. Next, the shoulder 100d of the drill 100 is detected by the same operation as step S25. At this time, the cutting edge 100a is vertical. Next, as shown in FIG. 12, the drill 100 (work rotating shaft 26) is rotated by a predetermined angle so that the center of the groove 100b on one side is positioned directly above.
[0035]
Next, it progresses to step S28 and performs thinning grinding. In the thinning grinding, the Y-axis table 3 is moved in the -Y direction and the Z-axis table 6 is moved in the -Z direction, so that the root portion 101d on one side of the pilot 101 is positioned on the outer peripheral edge of the flange of the rotating grindstone 23 as shown in FIG. It is set at a position facing the grinding portion 23c and facing the outer peripheral lower edge position 23e as the processing point Q of the grinding portion 23c shown in FIG. Next, the grindstone shaft 22 of the rotating grindstone 23 is fixed in a state orthogonal to the X axis, and the X-axis table 3 is moved to a predetermined position in the −X direction while rotating the grindstone 23 to lower the lower edge portion 23e of the grinding portion 23c. Is brought into contact with the thinning portion 102 on the back side of the pilot 101 to start grinding.
[0036]
At this time, the drill 100 (workpiece rotating shaft 26) is ground to the center position of the groove 100b while moving in the -Y direction and the + Z direction, and the other side of the pilot 101 is moved from the center position to the -Z direction. Move to the root 101d in the -Y direction.
As a result, the drill 100 moves with respect to the grinding part 23c of the rotating grindstone 23 while drawing a convex arcuate locus corresponding to the shape of the thinning part 102, that is, the thinning depth and the thinning width. The back side is thinned and the cutting edge 101a is ground. In other words, it is the same operation as moving the grinding part 23c of the rotating grindstone 23 so that the back side (thinning part 102) of the pilot 101 is drawn in an arc. Similarly, the back side of the pilot 101 of the groove 100b on the other side is also thinned. In this way, the thinning grinding of the pilot 101 is completed. Next, the X-axis table 3, the Y-axis table 4, the Z-axis table 6, and the grindstone axis table 17 return to the origin.
[0037]
Next, pre-grinding when the shoulder portion 101d of the drill 100 is missing as shown in FIG. 8 will be described.
When the shoulder 101d is damaged, the operator inputs the damaged length L from the operation panel as the forming grinding amount after mounting the drill 100 on the chuck 25. When the formation grinding amount is input in step S16 of FIG. 14, the control device proceeds to step S17, performs the same operation as in steps S14 and S15 described above, detects the blade edge, and determines the part that is not damaged. The shoulder 100d is detected. Next, in step S18, the damaged part is removed by the same operation as the above-described blade grinding in step S26, and the forming grinding of the cutting edge 100a and the pilot 101 is performed. Thereby, the cutting edges 100a and 101a are created. Thereby, pre-grinding is completed.
[0038]
Next, the process proceeds to step S19 in FIG. 15. In each step from step S19 to step S25, the edge of the drill 100 is detected, the pre-ground cutting edges 100a and 101a are ground (step S26), and the edge is detected (step). S27) and thinning grinding (step S28) are performed and the process ends. In pre-grinding, an automatic machining operation is executed by inputting a damaged length in a pre-processing cycle of a damaged drill, and a normal grinding cycle operation is executed after completion of the cycle.
[0039]
【The invention's effect】
As described above, according to the present invention, it is possible to accurately and efficiently grind the cutting edge, pilot cutting edge, and flank face of a drill having a pilot provided at the tip at the same time. Moreover, it becomes possible to perform the cutting edge, the pilot cutting edge, the flank face and the thinning grinding with a single rotating grindstone, thereby improving workability. Furthermore, the cutting edge, pilot cutting edge grinding, and thinning grinding can be performed simply by inputting the machining removal length of the drill, and there are effects such as easy handling.
[Brief description of the drawings]
FIG. 1 is a perspective view of a drill grinding apparatus according to the present invention.
FIG. 2 is a front view of the drill grinding apparatus shown in FIG.
FIG. 3 is a right side view of the drill grinding apparatus shown in FIG. 1;
4 is a plan view of the drill grinding apparatus shown in FIG. 1. FIG.
5 is a perspective view showing a relationship between an operator of the drill detecting means shown in FIG. 1 and a drill tip. FIG.
6 is an explanatory view showing a relationship between a drill and a rotating grindstone in the drill grinding apparatus shown in FIG. 4;
7 is an explanatory diagram of a drill detection procedure in the drill grinding apparatus shown in FIG. 1; FIG.
FIG. 8 is an explanatory diagram of drill pre-grinding in the drill grinding apparatus shown in FIG. 1;
FIG. 9 is an explanatory diagram showing the relationship between the tip of a drill and a rotating grindstone during grinding of a trill.
FIG. 10 is an explanatory diagram showing the relationship between the tip of the drill and the rotating grindstone during grinding of the drill.
FIG. 11 is an explanatory diagram in the case of grinding the tip of a drill with a rotating grindstone.
FIG. 12 is an explanatory diagram when the drill is thinned with a rotating grindstone.
FIG. 13 is a flowchart showing a procedure for performing drill grinding by the drill grinding apparatus shown in FIG. 1;
FIG. 14 is a part of a flowchart showing a drill grinding procedure;
FIG. 15 is a remaining portion of a flowchart showing a drill grinding procedure;
[Explanation of symbols]
1 Drill grinding equipment
2 Foundation
3 X-axis table
4 Y-axis table
6 Z-axis table
17 Wheel axis table
21 Wheel driving motor
22 Whetstone shaft
23 Rotating whetstone
23a Cutting edge grinding part
23b Pilot cutting edge grinding part
23c Thinning grinding part
24 Indexing spindle
25 Chuck
26 Work rotation axis
31 Length detection sensor
32 Cutting edge detection sensor
33 Actuator
100 drill
101 pilot
100a, 101a Cutting edge
101b Groove
100c, 101c Flank
102 Thinning part

Claims (5)

A drill grinding apparatus for grinding a pilot cutting edge and a pilot cutting edge provided with a pilot at the tip,
An X-axis table that is arranged on the base and can move horizontally in the X-axis direction;
A Y-axis table disposed on the base and movable horizontally in the Y-axis direction perpendicular to the X-axis direction;
A Z-axis table arranged perpendicular to the Y-axis table and movable in the Z-axis direction perpendicular to the X-axis and Y-axis directions;
An indexing spindle that is arranged horizontally on the Z-axis table and parallel to the X-axis direction and has a function of chucking the drill;
A grindstone shaft table that is arranged on the X-axis table and can be swung horizontally from a position orthogonal to the drill to a predetermined angular position;
A grinding wheel shaft motor disposed on the grinding wheel shaft table;
An outer peripheral surface and a base end outer peripheral surface continuous therewith have a shape corresponding to the tip angle of the drill and the tip angle of the pilot, and a rotating grindstone fixed to the rotating shaft of the grindstone shaft motor;
Control each table, indexing spindle, and grinding wheel spindle motor, rotate the drill, rotate the rotating grinding wheel to contact the cutting edge and pilot cutting edge of the drill and center the pilot root Control means for turning,
A drill grinding apparatus for grinding the cutting edge, pilot cutting edge and flank of the drill simultaneously. The X-axis table moves forward at a high speed until the rotating grindstone comes into contact with the tip of the drill, stops when it comes into contact, moves slightly backward, then moves forward at a low speed, and starts grinding with the rotating grindstone. The drill grinding apparatus according to claim 1. 2. The drill grinding apparatus according to claim 1, wherein the rotary grindstone has a flange formed at a peripheral edge portion of the tip, and performs thinning grinding of the drill by the peripheral edge portion of the flange. 4. The drill grinding apparatus according to claim 3, wherein the thinning grinding is performed after grinding of the cutting edge and the pilot cutting edge. The drill grinding apparatus according to claim 1,
A first sensor for detecting a tip of the drill;
A second sensor for detecting the diameter and cutting edge of the drill;
Input means for inputting the machining removal length of the drill,
The control device stores processing data and a processing program corresponding to a diameter of a drill to be processed, and performs predetermined processing from the storage unit based on the input processing removal length and a signal from each sensor. A drill grinding apparatus which reads data and controls each of the tables, the indexing spindle and the grinding wheel spindle motor.

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