JPH04336946A - Cutting tool regrinding method and equipment - Google Patents

Abstract

PURPOSE:To dispense with the manual measurement of dimensions of cutting tools so as to enable the regrinding of the tools in a short time and to make efficient use of the tools, in the regrinding of the cutting tools. CONSTITUTION:The relative position between a cutting tool and a measuring instrument is controlled with a control means to measure dimensions of the tool before regrinding (S2). Then the relative position between the cutting tool and a grinder is controlled to regrind the tool from a regrinding base point based on the measured tool dimension data (S3, S4). Then the relative position between the cutting tool and the measuring instrument is controlled to measure the tool dimensions (S5), and the tool dimension data measured after regrinding are stored in a memory means (S6) to use as the tool dimension data in a work process.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool resharpening method and apparatus.

0002

2. Description of the Related Art Generally, a cutting tool re-sharpening device is equipped with a grindstone for grinding and a grindstone drive device, and is adapted to press the cutting edge of the tool held in a holder against the grindstone. Furthermore, an automatic resharpening device has been proposed to automate tool resharpening work. As an example of this, a main shaft for attaching a grindstone to a main body and rotationally driving the grinding wheel, and a movable table having a holding part that holds a cutting tool and can be rotationally driven are provided, and the main shaft and the table are installed separately from the main body. It is known to include a control device that moves to control the relative positions of the cutting tool and the grindstone, and the grindstone grinds the cutting tool while moving the spindle and table using the control device.

0003

[Problems to be Solved by the Invention] Conventional cutting tool re-sharpening devices re-sharpen the worn cutting edges of cutting tools using a grindstone as described above, but no consideration is given to tool dimension measurement. Since it does not have a tool dimension measurement function, it is not suitable for improving the efficiency of tool resharpening work and workpiece cutting work. In other words, in order to accurately determine the position of the grinding wheel base point for the tool during tool resharpening and to enable programming for resharpening, the dimensions of the tool are measured manually using a micrometer, dial gauge, etc. before resharpening. Measured values were input into the control device of the resharpening equipment by manual input operation. Furthermore, after re-sharpening, tool dimensions are measured manually using a micrometer, dial gauge, etc. in order to obtain data for tool management, and these measured values are input into the control device of the NC machine tool through manual input operations. Ta. In this way, it is necessary to manually measure the tool dimensions before and after tool resharpening work using the cutting tool resharpening device.
There was a problem that machining efficiency was reduced.

The present invention solves the above-mentioned conventional problems and provides a cutting tool that eliminates the need for manual tool dimension measurement, allows resharpening of the cutting tool in a short time, and improves efficiency when using the tool. The purpose is to provide a resharpening method and device.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the cutting tool re-sharpening method of the present invention measures tool dimensions for setting a re-sharpening reference point before re-sharpening, and based on the measured tool dimension data. Re-sharpening is performed from the resharpening reference point, after which tool dimension measurement for tool management is performed, and the obtained tool dimension data is stored in a storage means.

In order to achieve the above object, the cutting tool resharpening device of the present invention includes a holding part that holds a tool, a grindstone that is movable relative to the tool, and a grindstone that is movable relative to the tool. at least one measuring device; storage means;
Re-polishing by controlling the relative positions of the cutting tool and the grindstone and the relative positions of the cutting tool and the measuring device to sequentially perform tool dimension measurement before re-polishing, re-polishing processing, and tool dimension measurement after re-polishing. and control means for storing subsequent tool dimension data in the storage means.

[0007]

[Operation] With the above configuration, the control means controls the relative positions of the cutting tool and the measuring device to measure the dimensions of the tool before re-sharpening, and then controls the relative positions of the cutting tool and the grindstone to measure the dimensions of the tool. Re-grinding is performed from a re-grinding reference point based on the tool dimension data, and after this, the relative position of the cutting tool and the measuring device is controlled to measure the tool dimension, and the tool dimension data measured after polishing is stored in the storage means, and the workpiece is Used as tool dimension data during machining.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described with reference to the accompanying drawings.

FIGS. 3 to 8 show an outline of the apparatus of this embodiment, in which a table 2 of a cutting tool resharpening apparatus 1 is provided on a bed (not shown) so as to be movable in the X and Y directions, that is, in the left-right and front-back directions. ing. At a position above the table 2, the column 3 is provided with a spindle head 4 that can be moved in a three-dimensional direction by numerical control. Tools such as drills and end mills can be attached and removed. The cutting tool resharpening device 1 is also equipped with an automatic tool changer (ATC) device 6, and an ATC arm 8 is provided between the tool magazine 7 provided on the side surface of the column 3 and the main shaft 5. ing. The tool magazine 7 has a plurality of tool pots (not shown) connected in a loop shape, and cutting tools 9 are stored and held in these tool pots via a holder portion 10 provided integrally therewith. Each cutting tool 9 has a tapered holder portion 10 of the same shape attached to the main shaft 5.
A pull stud 11 is provided at the upper part of the holder part 10, and a V flange part 12 which can be gripped by the ATC arm 8 is provided at the lower part. A rotation drive device 13 such as a servo motor is provided on the table 2, and the rotation shaft 1 is rotated by the rotation drive device 13.
A grindstone 15 is attached and fixed to 4. This rotating shaft 14 is oriented in the Z direction, and the grindstone 15 is horizontal. In this case, the angle of the grindstone 15 with respect to the cutting tool 9 can be freely set by disposing the rotary drive device 13 on a mounting base (not shown) so that the angle of the mounting base can be variably controlled. An optical tool size measuring device 16 and a contact tool size measuring device 17 are provided on the table 2 at positions that do not cause any inconvenience to the tool grinding by the grindstone 15. The optical tool size measuring device 16 has a light projecting section 20 consisting of a laser oscillator 18 and a shutter 19, and a light receiving section 23 consisting of an objective lens 21 and a photodetector 22. The contact type tool size measuring device 1
7 is provided with a contact detector 25 on the top of the measuring instrument main body 24 for detecting contact from above and from the side of the tool.

FIG. 1 shows a block diagram showing the functional configuration of the apparatus of this embodiment, and the control means 26 consisting of a system control computer includes a CPU 27 which is a central processing unit.
, system bus 28, processing data input/output interface 29, dimension measurement signal input interface 30,
It is equipped with an interface 31 for inputting a resharpening device control signal, an interface 32 for outputting a resharpening device control signal, a ROM 33 that is a storage memory for system control programs, and a RAM 34 that is a storage memory for processing data, programs, measurement data, etc. . 35 is an operation section.

Next, the operation of the apparatus of this embodiment will be explained with reference to the flowchart shown in FIG. First, the tool pot storing the tool 9 requested by the tool exchange command is called to the exchange position, and the V of the tool 9 is
Grasp the flange part 12 and carry it to the position of the main shaft 5.
(Step 1). Next, the optical tool size measuring device 16 is used to measure the tool size for setting the resharpening reference point. This is done by rotating the tool 9 at high speed together with the main shaft 5, releasing the shutter 19 of the optical tool dimension measuring device 16, and irradiating the light beam 36 from the laser oscillator 18 toward the light receiving section 23. The light enters the photodetector 22 through the light beam. In this state, by moving the table 2 as shown in FIG. 4, the axis of the tool 9 is aligned with the light beam 3.
6 and is pre-measured and RAM
34 is moved to the height B position of the origin A. Next, by bringing the spindle head 4 close to the table 2, the lower end of the tool 9 blocks the light beam 36, and this state is detected by the photodetector 22 and sent to the control means 26. The control means 26 stores the feed amount C at this point, and uses this feed amount C and the height B to determine the tool length D.
Calculate and store. Further, the control means 26 horizontally moves the tool 9 to a position at a distance E from the light beam 36 as shown in FIG. 5 by moving the table 2 when the light beam interruption state is detected. Next, by moving the table 2 and moving the tool 9 toward the light beam 36 side, the side end of the tool 9 blocks the light beam 36, and this state is detected by the photodetector 22 and sent to the control means 26. The control means 26 stores the feed amount F at this point, calculates the tool radius G from this feed amount F and the distance E, and calculates and stores the tool diameter (step 2). Next, the control means 26 sets the base position of the grindstone 15 with respect to the tool 9 based on the measured tool length and tool diameter (step 3). Thereafter, as shown in FIG. 6, the control means 26 moves the spindle head 4 and the table 2 based on the polishing program, sets them at the polishing reference position, and rotates the tool 9 and the grindstone 15 to perform a predetermined cutting edge polishing. (Step 4). Next, the contact type tool size measuring device 17
is used to measure tool dimensions for tool usage data. This is done by moving the tool 9 above the contact type tool dimension measuring device 17, rotating the tool 9 in the opposite direction to the cutting direction as shown in FIG. 7, lowering the tool 9, and then moving the table 2. The center line of the contact detector 25 is determined by pressing a position at a predetermined height from the lower end to each of the four sides of the square shape in plan view of the contact detector 25 and detecting the contact, and the axis of the tool 9 is aligned on this center line. let Next, the table 2 on which the origin A of the spindle head 4 has been measured in advance
Move it to the height H position from . Next, by lowering the spindle head 4 and bringing the lower end of the tool 9 into contact with the contact detector 25, this detection signal is input to the control means 26, and the control means 26 memorizes the amount of movement I from the height H. , the movement amount I and the height H, and the measurement device 17 whose measurements are stored in advance.
The tool length K is calculated based on the height J. In addition, as shown in FIG. 8, the table 2 is moved and the tool 9 is
After moving the spindle head 4 to the side, the table 2 is moved while the spindle head 4 is lowered by a predetermined amount to bring the tool 9 into contact with the side edge of the contact detector 25, and the detection signal of this contact causes the tool 9 to be moved from the center line. The amount of movement L is stored, and the distance M from the center line of the contact detector 25 to the side surface is measured and stored in advance.
The radius N of the tool 9 is calculated from , and the tool diameter is calculated (
Step 5). After that, the tool dimensions measured in step 5 are stored in the address position corresponding to tool 9 in the RAM 34 (step 6), and the tool is replaced in step 7, and the process moves to step 2 to repeat the same operation. .

As described above, in this embodiment, the control means 26 controls the relative positions of the cutting tool 9 and the measuring device 16 to measure the dimensions of the tool before re-sharpening. Re-polishing is performed from a re-grinding reference point based on the measured tool dimension data by controlling the relative position of the cutting tool 9 and the measuring device 17, and then the tool dimension is measured by controlling the relative positions of the cutting tool 9 and the measuring device 17, and the measurement is performed after polishing. The tool size data obtained by the grinding is stored in the RAM 34, which is a storage means, and is used as tool management data, so that the grinding wheel position relative to the tool can be accurately determined when resharpening the tool, and programming for resharpening can be performed. In order to accurately determine the tool position relative to the workpiece during workpiece machining and to enable programming for workpiece machining, the tool dimension measurement performed before regrinding is a series of tool polishing and This is done automatically by operation, and this eliminates the need to manually measure tool dimensions before and after tool resharpening work with a cutting tool resharpening device, improving machining efficiency and improving efficiency when using tools. It is also possible to achieve Further, an IC chip (not shown) may be provided in the holder part 10 that is provided integrally with the tool 9, and the tool dimension data measured after resharpening may be stored in the IC chip, or the holder part 10 may be used for tool identification. A barcode label (not shown) may be provided so that the code content of the barcode label and the tool dimension data can be compared and read.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, although a projection type and a contact type are shown as measuring devices, various types of measuring devices can be used.

[0014]

[Effects of the Invention] The present invention measures the tool dimensions before re-sharpening by controlling the relative positions of the cutting tool and the measuring device, and then uses the measured tool dimension data by controlling the relative positions of the cutting tool and the grindstone. Re-sharpening is performed from the re-sharpening reference point set based on this, and then the relative positions of the cutting tool and the measuring device are controlled to measure the tool dimensions, and the tool dimension data measured after polishing is stored in the storage means and tool management data is stored. Since it is used as a tool, manual measurement of tool dimensions is not necessary, cutting tools can be resharpened in a short time, and the efficiency of tool use can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the functional configuration of a cutting tool resharpening device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation flow of the cutting tool resharpening device.

FIG. 3 is a schematic explanatory diagram of a cutting tool resharpening device.

FIG. 4 is a schematic explanatory diagram showing the state of tool length measurement before resharpening.

FIG. 5 is a schematic explanatory diagram showing the state of tool diameter measurement before resharpening.

FIG. 6 is a schematic explanatory diagram showing a resharpening state.

FIG. 7 is a schematic explanatory diagram showing the state of tool length measurement after resharpening.

FIG. 8 is a schematic explanatory diagram showing the state of tool diameter measurement after resharpening.

[Explanation of symbols]

1 Cutting tool resharpening device 2 Table 5 Main shaft (holding part) 9 Cutting tools 15 Whetstone 16, 17 Tool dimension measuring device 26 Control means 34 RAM (storage means)

Claims (3)

[Claims] Claim 1: In a cutting tool re-sharpening method for re-sharpening a worn cutting edge of a cutting tool, tool dimensions are measured for setting a re-sharpening reference point before re-sharpening, and the re-sharpening reference point is determined based on the measured tool dimension data. A method for re-sharpening a cutting tool, which comprises: re-sharpening the cutting tool, then measuring the dimensions of the tool for tool management, and storing the obtained tool dimension data in a storage means. 2. The cutting tool resharpening method according to claim 1, wherein the tool dimension measurement for setting the resharpening reference point is performed by a projection method. 3. A cutting tool re-sharpening device for re-sharpening a worn cutting edge of a cutting tool using a grindstone, comprising: a holder for holding a tool; a grindstone movable relative to the tool; At least one relatively movable measuring device, a storage means, and controlling the relative positions of the cutting tool and the grindstone and the relative positions of the cutting tool and the measuring device to measure tool dimensions before re-polishing and re-polishing. A cutting tool re-sharpening apparatus characterized by comprising: a control means for sequentially performing the steps of: and measuring the dimensions of the tool after re-sharpening, and storing the data of the tool dimensions after re-sharpening in the storage means.