JPH01306178A - Grinding device - Google Patents

Abstract

PURPOSE:To manufacture a product of an excellent finishing face with good efficiency by detecting the variation state of the signal transmitted from the reading head of a linear scale fitted to a mobile panel and forming the structure of detecting the contact positions of a grindstone and work, and with a work fitting panel. CONSTITUTION:When a mobile panel is delivered in a grindstone rotating shaft direction, the pulse signal corresponding to this quick feeding speed is transmit ted from the reading head of a linear scale 16. In this case, when the front face of a work fitting panel 7 is abutted to the front end face of the grindstone 4, the signal from this head is varied widely in the pulse waveform of the quick feeding state so far or becomes in non-transmission state. This variation point is detected by a pulse width detector and stored in a CPU by corresponding to the measured value of the linear scale. After fixing a work 5 to the fitting panel by retreating the mobile panel, a grinding start point is stored in the CPU by advancing the mobile panel 10 again and abutting the front end face of the grindstone and work. The grinding amt. of the work is operated by the CPU, the notching amt. is stored and an automatic sizing is coped with.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for grinding a workpiece by adjusting the distance between opposing rotating shafts.

[Prior Art] Conventionally, a grinding wheel is attached to one of two opposing rotating shafts, a workpiece is attached to the end of the other shaft, and a feeding mechanism is used to move one of the rotating shafts in the direction of the opposing shaft. The equipment visually confirms the grinding start position of the workpiece, takes into account the dimensions of the workpiece measured in advance, determines the machining dimensions by calculation from the workpiece mounting surface, and As a means to automate the detection of the front and back sides (front of the workpiece mounting board).

A position detector such as a touch switch, a gap detection sensor, or a load cell is provided opposite to the tip of the control rod of the feeding mechanism to set the processing position. (See, for example, Japanese Patent Application No. 63-22490.) [Problems to be Solved by the Invention] A signal sent from a reading head of a linear scale mounted on a movable plate indicates the processing start position in a conventional grinding device of this type. In addition to detecting and setting the change state of
By similar means.

By detecting the contact position between the grinding wheel and the workpiece mounting plate, that is, the position on the back side of the workpiece, and calculating and setting the desired finished dimensions of the workpiece, it is possible to detect positions where durability and resolution are poor in the grinding work environment. without using a venting device.

The purpose is to provide high-precision automatic sizing processing functions.

[Means for Solving the Problems J] In order to achieve the above-mentioned objects, the present invention has a rotary shaft on a fixed table on which a grindstone is attached, and a shaft on a movable plate on which a movable force is applied in the direction of the fixed table. A rotating shaft with a workpiece mounting plate at the end thereof is installed on the same plane, and a control rod that moves forward and backward by a feed screw shaft connected to a motor is equipped on the fixed base. It detects the changing state of No. 8 sent out from the reading head of the linear scale installed on the moving platen, and detects the contact position of the 1ilJ stone and the workpiece and the contact with the workpiece mounting platen. It has an added function to detect the position.

[Action J Processing using a grinding device configured as described above.

First, when the movable plate is sent in the direction of the grinding wheel rotation axis, a pulse signal corresponding to the rapid traverse speed is sent from the reading head of the linear scale. The signal from the reading head changes significantly from the pulse waveform of the previous fast-forward state, or there is no transmission, so the pulse width detector detects this change point (corresponding to point a in Figure 3). This is detected by the linear scale and stored in an electronic control circuit (CPU etc.) in correspondence with the measured value of the linear scale.

Next, the moving plate was moved back and the workpiece was fixed on the mounting plate.
When the movable platen is moved forward again to bring the front end surface of the grindstone into contact with the workpiece, the grinding start point is stored in the electronic control circuit by the same detection action as described above.

Therefore, if the desired finished dimension of the workpiece whose thickness has been measured in advance is set to 1 in the sizing device connected to the child control circuit, the electronic control circuit calculates the amount of scraping of the workpiece,
Memorizes the depth of cut and handles automatic sizing processing.

[Actual Example] To explain the embodiment of the present invention with reference to the drawings, 1 in Figure 9 is a rotating shaft that is supported by a fixed table 3 provided on a base 2 and has a grindstone 4 attached to its front end, which is installed opposite to this. The rotating shaft 6 of the workpiece 5 is provided with a mounting plate 7 for the processing step 5 at its end, and is slidable in the direction of the rotating shaft 1 by guides 9 and 9' engaged with rails 8 on the base 2. It is pivotally supported on a movable platen 10.

The spring) 1 connects the rear end of the movable platen 10 and a suitable position on the base 2 spaced apart from each other, and provides movable force to the movable platen 10 in the direction of the fixed table 3. This movable force can be replaced by other methods such as a hydraulic pneumatic cylinder or a weight.

Reference numeral 12 denotes a control rod whose rear end is screwed onto a feed screw shaft 14 connected to a motor 13 and is non-rotatably fitted into a guide hole 15, with its tip end facing the movable plate IO.

16 is a linear scale attached to the movable plate 10, which sends the signal from the reading head 17 engaged with the base 2 side to the digital display 18, and also sends the signal via the pulse width detector 19 which detects the change in the +fK waveform. The signal is input to an electronic control circuit that controls the drive of the motor 13.

Reference numeral 20 denotes a sizing device for programming and inputting the finished dimensions of the workpiece 5. By this operation, the machining depth of the grindstone 4 is automatically displayed on the display 21.

Since the present invention is constructed as described above, it can be processed using the grindstone 4 shown in FIG. ! ! When the automatic start command for the device is issued while the grinding wheel 4 and the workpiece 5 are separated from each other, the rotating shaft 1 of the grinding wheel 4 and the rotating shaft 6 of the workpiece 5 begin to rotate in opposite directions, and the high-speed drive of the motor 13 causes the rotating shaft 1 of the grinding wheel 4 to start rotating in the opposite direction. The feed screw shaft 14 rotates, the control rod 12 moves backward (moves to the left in the drawing), and following this, the movable plate 10 moves forward rapidly by the spring 11.

When the workpiece 5 comes into contact with the grinding wheel 4 as shown in FIG. 2 of the drawing as the movable platen 10 moves forward, a signal is sent to the motor 13 from an electronic control circuit that stores this position in correspondence with the measured value of the linear scale 16. The rotational speed command is automatically switched to a minute feed speed for grinding, which is set in advance according to the material, shape, etc. of the workpiece.

Therefore, as the feed screw shaft 14 rotates, the control rod 12 moves back and forth at a very low speed, and the movable platen 1o follows this movement.

While being regulated by the movement of the control rod 12 by the spring 11, it moves forward at an appropriate speed, and the grinding work that is suitable for the workpiece progresses.

The signal from the read head 17 of the linear scale 16 is also sent to a digital display 18.

The feeding status of machining process 5 can always be read.

It is possible to determine whether the cutting feed rate command of the control rod 12 is appropriate for the machining conditions of the workpiece 5, and since the finished dimensions of the workpiece 5 have been input into the sizing device 20 in advance, the reading head 17 , the grinding process continues until the set value on the linear scale 16 corresponding to this designated position is detected, and the normal and active grinding process that does not give any distortion to the workpiece 5 brings the workpiece 5 to the desired dimensions. will continue until it is completed.

Furthermore, in precision grinding, the feed of the workpiece 5 is stopped at the completion point of the cutting feed, and only contact processing with the grindstone 4 is performed. By providing a so-called spark-out time, the roughness of the ground surface of the workpiece 5 can be reduced.

Improve dramatically.

[Effects of the Invention] Since the present invention is configured as described above, by detecting signal changes from the linear scale reading head with a pulse width detector, it is possible to detect the contact between the grinding wheel and the workpiece mounting plate in advance. The contact position and the contact position between the grindstone and the front surface of the workpiece are stored in the electronic control circuit as set values on the linear scale.

Furthermore, by programming and inputting the desired dimensions of the product into the sizing device, automatic grinding work, i.e. rapid feed→
Partial cycle of grinding at appropriate feed speed → spark out and quick return is performed.

To efficiently manufacture products with excellent finished surfaces.

Conventional touch switches, also used to detect machining set points such as the grinding wheel and the front and back sides of the workpiece.
Gap detection sensors or load cells have short lifespans and low positioning accuracy in work environments where they are exposed to grinding fluid, but by replacing them with the linear scale mechanism described above, high resolution and long stable operation can be achieved. In addition to the simplification of the mechanical measuring section, this method is effective in improving machining accuracy and reducing machining costs, and also facilitates maintenance of the device itself.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a device according to the present invention. Figure 2 is a partially cutaway front view showing the state where the grinding wheel and workpiece are in contact, Figure 3 is a graph showing changes in the signal waveform emitted from the reading head of the linear scale, and Figure 4 1 is a block circuit diagram showing a main part of an electronic circuit that detects a signal change. FIG. 1... Grinding wheel rotation axis. 3...Fixed stand. 4...Whetstone. 5...Processed product. 6...Workpiece rotation axis. 7... Workpiece mounting board. 10...Moveable board. 12...Control rod. 13...Motor. 14...Feed screw shaft. 16...Linear scale. 17...Reading head. Patent applicant: Sensei Seiki Co., Ltd. Figure 3 Procedural amendment (method) % formula % 2 δ title of the invention

Claims (1)

[Claims] (1) A rotating shaft on a fixed table on which a grindstone is attached and a rotating shaft on which a movable force is applied in the direction of the fixed table are provided on the same plane,
The above-mentioned fixed base is equipped with a control rod that moves forward and backward by a feed screw shaft connected to a motor, and the tip of the control rod is placed opposite the movable platen. A grinding device that detects the contact position between a grindstone, a workpiece, and a workpiece mounting plate by detecting a change state of a signal sent out.