JPH05138438A - Automatic aligning method for phase of screw thread and device therefor - Google Patents

Abstract

PURPOSE:To automatically and accurately align the phases of a grinding wheel and of a workpiece, and to execute their alignment in a short time by moving the workpiece and the grinding wheel on a fixed process in the directions of Z and X axes, and repeating the setting up of contact, noncontact and middle positions. CONSTITUTION:After making a grinding wheel 9 abut on a workpiece 8, which is moved in the direction of a Z axis, and the Z axis position of the one end of the thread groove 4 of the workpiece 8 is detected through a OFF signal issued from a transmitting device 2. Since the workpiece 8 is further moved in the direction of the Z axis, and the Z axis position where a ON signal occurs suits to the position of the other end of the same thread groove 4, the grinding wheel 9 and the workpiece 8 are fitted to a middle position between both the Z axis positions to make the grinding wheel and the workpiece nearly coincide in their phases. In this state, the grinding wheel is slightly advanced toward the workpiece, and the workpiece is moved in one direction to detect the ON signal, and moreover moved in a direction opposite to the above direction to detect the ON signal, and the workpiece and the grinding wheel are fitted to a middle position between the above positions where the ON signals are detected to precisely align the grinding wheel and the workpiece.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for automatically phasing a screw groove and a grindstone in a screw grinder for finishing the screw groove of a work in which a male screw or a female screw is preprocessed.

[0002]

2. Description of the Related Art In order to finish thread-groove grinding of a work in which a male or female thread groove is preprocessed by a screw grinder, it is necessary to accurately perform phase alignment between the grindstone and the thread groove of the work. .. The phase matching method that has been generally used in the past was performed manually or visually. That is, the grindstone is brought close to the thread groove of the work and the contact state between the thread groove and the grindstone is visually checked, and the phase is adjusted based on the degree of generation of sparks or the like generated when the two are in contact with each other.

[0003]

The above-mentioned visual phase alignment between the grindstone and the thread groove requires a high degree of skill and requires a lot of time for phase alignment, which causes a problem of lowering the machine operating rate. is there. Further, in the case of a female screw, in particular, it is difficult to visually recognize, and there is a problem that accurate phase alignment cannot be performed.

The present invention solves the above problems, and automatically adjusts the phase of a male screw and a female screw without requiring special skill, and makes it possible to improve the precision of thread groove machining and the machine operating rate. It is an object to provide an automatic phasing method and device for a groove.

[0005]

In order to achieve the above-mentioned object, the present invention reciprocates in the axial direction (Z-axis direction) of a workpiece while rotating the workpiece preprocessed with a thread groove around the C-axis. While moving the grindstone rotating at a high speed in a direction approaching or separating from the work (X-axis direction), contact or non-contact between the grindstone and the work is detected and stored as an ON or OFF signal, and the grindstone and the work are stored. And a grinding stone is brought into contact with the outer periphery of the work moving along the C-axis and the Z-axis to generate an ON signal, and the movement of the work and the grinding stone is stopped at that moment. From the state, the work is moved left in the Z-axis direction to detect an OFF signal, the Z-axis position at that moment is stored, and further the work is moved left in the Z-axis direction to detect an ON signal and the Z-axis at that moment is detected. The position is memorized, and both Z-axis positions memorized Position the work at the position, then move the grindstone slightly along the X-axis, slightly move the work right along the Z-axis to detect the ON signal, and store the Z-axis position at that moment. Then, the work is moved to the left along the Z-axis to detect an ON signal, the Z-axis position at that moment is stored, the work is positioned at an intermediate position between the stored Z-axis positions, and the grindstone is continuously moved to the X-axis. Along the Z-axis direction from the OFF signal detection position to the ON signal detection until the amount of movement in the right and left rows in the Z-axis direction is below a specified value. It features a method for aligning the movement phase of the thread groove so that the work is stopped, and moves the workpiece in the Z axis direction while rotating the workpiece in which the thread groove is pre-machined around the C axis, and moves in the X axis direction at high speed. The rotating whetstone An automatic phase adjustment device for phase matching with allowed contact engagement,
A detection sensor that detects the moment when the grindstone comes into contact with the workpiece and the moment that the grindstone does not contact, a transmitter that transmits the detection as an ON / OFF signal, and Z at the time of transmitting the ON / OFF signal.
An automatic phasing device for a screw groove is provided which is provided with a control device for reading and storing the axial position, calculating the intermediate position thereof, and controlling the rotation and movement of the C-axis, Z-axis and X-axis of the workpiece and the grindstone. It is a thing.

[0006]

After the whetstone is brought into contact with the work, the work is moved in the Z-axis direction, and the Z-axis position of one end of the thread groove of the work is detected by the generation of the OFF signal. Next, the work is further moved in the same direction, and the Z-axis position where the ON signal is generated corresponds to the position of the other end of the same thread groove. Therefore, by aligning the grindstone and the work at an intermediate position between the two Z-axis positions, the phases of the grindstone and the work are substantially matched. From that state, advance the grindstone slightly to the work side, move the work in one direction to detect the ON signal, and then move it in the opposite direction to turn it ON.
By detecting the signal and aligning the workpiece and the grindstone at the intermediate position, it is possible to perform more accurate phase alignment than the phase alignment position. After that, the same operation is repeated, and when the movement amount due to the Z-axis movement of the workpiece in one direction and the other direction from the Z-axis intermediate position becomes smaller than the predetermined value, the intermediate position is almost accurate. Becomes
All the above operations are performed automatically. The same applies to male and female threads.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a work 8 having a preprocessed thread groove 4 is gripped by a chuck of a headstock 10 of a screw grinder and center-supported by a tailstock 11. A rotating mechanism (not shown) in the headstock 10 drives the work 8 to rotate about the C axis. Further, the work 8 is moved in the axial direction (Z-axis direction) by a feed mechanism (not shown). The rotation of the C-axis and the movement of the work 8 in the Z-axis direction are performed synchronously based on the screw leads, and are configured to be able to operate independently. The grindstone 9 has an outer peripheral shape that matches the shape of the thread groove 4, is rotationally driven by the grindstone base 12, and is supported so as to move along a direction (X-axis direction) approaching or separating from the work 8. .. C axis of work 8 and Z
The movement in the axial direction and the movement in the X-axis direction of the grindstone 9 are all automatically controlled by the control device 3.

The headstock 10 includes one of the detection heads A
The E sensor 1 is fixed, and the detection signal from the AE sensor 1 is input from the transmission device 2 to the control device 3 as an ON / OFF signal. The AE sensor 1 detects the moment when the grindstone 9 rotating at a high speed comes into contact with the work 8 and the moment when the grindstone 9 separates from the work 8, and the transmitter 2 is turned on when the grindstone 9 comes into contact with the work 8. A signal is issued and OF
It is formed so as to emit an F signal. Further, when an ON / OFF signal is input to the control device 3 from the transmission device 2, the control device 3 is configured to detect and store the Z-axis position at that moment.

Next, the phase matching operation in this embodiment will be described with reference to FIGS. For convenience of explanation, the outer peripheral portion of the work 8 between one thread groove 4 and the adjacent thread groove 4 is 5, the right edge portion of the thread groove 4 in the figure is 6, and the left edge portion is 7. As shown in FIG. 2, the Z-axis is in a stopped state and C
The grindstone 9 rotating at a high speed while the shaft, that is, the work 8 is being rotated is gradually advanced. As shown in FIG. 3, the grindstone 9 contacts the outer periphery 5 of the work 8, the AE sensor 1 detects the moment, and stops the C-axis and the X-axis in the state where the ON signal is transmitted. Next, as shown in FIG. 4, the work 8 is moved rightward from the state of FIG. 3 (hereinafter, referred to as Z-axis rightward), and the moment when the grindstone 9 separates from the outer peripheral portion 5 and the OFF signal is transmitted is detected. .. The controller 3 stores the Z-axis position at that moment. Next, as shown in FIG. 5, the Z-axis is moved further rightward from the state of FIG. 4, and the position where the grindstone 9 contacts the left end edge portion 7 and the ON signal is transmitted is detected. The controller 3 stores the Z-axis position at this position. Next, the control device 3 calculates an intermediate Z-axis position between the two stored Z-axis positions, moves the Z-axis leftward as shown in FIG. 6, and moves the work 8 to the intermediate Z-axis position. Stop. In this state, the grindstone 9 and the screw groove 4 are phase-matched to substantially coincident positions. Next, as shown in FIG. 7, the grindstone 9 is slightly advanced along the X axis. Figure 8
As shown in (3), the Z axis is moved leftward and the moment when the right end edge portion 6 and the grindstone 9 come into contact is detected, and an ON signal is transmitted. The controller 3 stores the Z-axis position at that position. Further, as shown in FIG. 9, the Z axis is moved to the right and the moment when the grindstone 9 hits the left end edge portion 7 of the thread groove is detected, and an ON signal is transmitted. The control device 3 stores the Z-axis position at that moment. Next, FIG.
As shown in 0, the Z-axis is moved leftward again, and the work 8 is sent to the intermediate position between the two Z-axis positions stored in the control device 3. In this state, the work 8 and the grindstone 9 are substantially in phase with each other. Further, as shown in FIG. 11, the grindstone is slightly moved in the X-axis direction, and the above operation is repeated. As shown in FIG. 12, the phase of the work 8 and the grindstone 9 in a state in which the movement amount until the ON signal is generated when the grindstone 9 contacts the right end edge portion 6 and the left end edge portion 7 and the ON signal is generated is smaller than the predetermined value δ. Check the alignment position. In that state, the phase matching between the work 8 and the grindstone is completed. The predetermined value δ is set to an appropriate value in accordance with the shape and size of the thread groove 4, the outer circumference of the work 8 and the like. Figure 1
As shown in FIG. 2, when the phase alignment between the work 8 and the grindstone 9 is completed, the control device 3 drives the work 8 in the C-axis and Z-axis directions and the grindstone 9 in the X-axis direction to finish-grind the thread groove 4. I do.

In the above embodiments, the shapes of the thread groove 4 and the grindstone 9 are shown in the figures, but of course the invention is not limited thereto. Further, although the present embodiment has been described with respect to the work 8 having a male screw, it is similarly applied to a work having a female screw. Further, the detection sensor is not limited to the AE sensor.

[0011]

According to the present invention, the following effects can be obtained. (1) The work and the grindstone are moved in the Z-axis direction and the X-axis direction based on a predetermined process, and the phases of the grindstone and the work are automatically aligned by repeating operations such as contact, non-contact, and intermediate position setting. Done exactly. Thereby, the phase adjustment is performed in a short time, and the machine operating rate can be improved. (2) High-precision phase matching can be performed and high-precision screw grinding can be performed without requiring advanced skill. (3) The phase alignment of the female screw, which is difficult to visually observe, is performed as in the case of the male screw. (4) It is easily applied to screw work of various shapes.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an overall structure of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing the initial state of the grindstone and the work, which is a drawing for explaining the operation of the embodiment.

FIG. 3 is a partial cross-sectional view showing a contact state between a grindstone and a work outer periphery in the same embodiment.

FIG. 4 is a partial cross-sectional view showing the moment when the grindstone of the embodiment separates from the outer periphery of the work.

FIG. 5 is a partial cross-sectional view showing the moment when the grindstone of the embodiment contacts the left end edge of the work.

FIG. 6 is a partial cross-sectional view showing a schematic phase matching state between a grindstone and a work according to the embodiment.

FIG. 7 is a partial cross-sectional view showing a state in which the grindstone is advanced to the thread groove side from the state of FIG. 6 of the same embodiment.

FIG. 8 is a partial cross-sectional view showing the moment when the grindstone of the embodiment contacts the right end edge portion.

FIG. 9 is a partial cross-sectional view showing the moment when the grindstone of the embodiment contacts the left edge portion.

FIG. 10 is a partial cross-sectional view showing a substantially accurate phase alignment state between the grindstone and the work according to the embodiment.

FIG. 11 is a partial cross-sectional view showing a state in which the grindstone is further advanced to the thread groove side from the state of FIG. 10 of the same embodiment.

FIG. 12 is an enlarged partial sectional view for explaining a final phase matching state of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AE sensor 2 Transmitter 3 Control device 4 Thread groove 5 Outer peripheral part 6 Right edge 7 Right edge 8 Work piece 9 Grinding wheel 10 Spindle head 11 Tailstock 12 Grinding wheel stand

Claims (2)

[Claims] 1. A workpiece having a thread groove preprocessed is reciprocally moved in the axial direction (Z-axis direction) of the workpiece while rotating around the C-axis, and is rotated at a high speed in a direction approaching or separating from the workpiece (X-axis direction). While moving the grinding wheel, the contact or non-contact between the grinding wheel and the workpiece is detected as an ON or OFF signal,
A method of storing and aligning the phase of the grindstone and the work, in which the grindstone is brought into contact with the outer circumference of the work moving along the C axis and the Z axis to generate an ON signal, and at the moment, the work and the grindstone are moved. The movement is stopped, the work is moved leftward in the Z-axis direction from that state, and the OFF signal is detected.
The axis position is memorized, and the work is turned leftward in the Z-axis direction.
The signal is detected, the Z-axis position at that moment is stored, the workpiece is positioned at an intermediate position between the stored Z-axis positions, then the grindstone is moved slightly along the X-axis, and the workpiece is moved to the Z-axis. Slightly rightward along to detect the ON signal, store the Z-axis position at that moment, and further move the workpiece left along the Z-axis to detect the ON signal and store the Z-axis position at that moment. Then, the work is positioned at the intermediate position between the stored Z-axis positions, and then the grindstone is slightly moved along the X-axis, and the above-mentioned operation is repeated until the OFF signal is detected.
A method for automatically phasing a thread groove, wherein the movement of the work is stopped when the amount of movement of the work in the rightward and leftward directions in the Z-axis direction until the N signal is detected becomes a predetermined value or less. 2. A workpiece pre-processed with a thread groove is moved in the Z-axis direction while rotating around the C-axis, and X
An automatic phasing device for performing phase adjustment by abutting and engaging a grindstone that is moving at high speed in the axial direction with a work, and a detection sensor that detects the moment when the grindstone contacts the work and the moment of non-contact, A transmitting device that transmits the detection as an ON / OFF signal, and a Z-axis position at the time of transmitting the ON / OFF signal is read and stored, and an intermediate position between them is calculated to calculate the C-axis, Z-axis and X-axis of the workpiece and the grindstone. An automatic phasing device for screw grooves, which is provided with a control device for controlling rotation and movement.