JP2023170013A - Gear phase measuring method and gear machining apparatus - Google Patents

Abstract

To provide a gear phase measuring method and a gear machining apparatus that can accurately measure the phase of gear teeth.SOLUTION: The gear phase measuring method of the present invention comprises: bringing a touch probe 130 into contact with a side surface 162a of one of gears (workpiece 160) to determine a reference position P0 in a tooth width direction of the gears; identifying centers of respective tooth widths of the gears as measurement positions P1 and P2 based on distances in the tooth width direction from the reference position, respectively; and bringing the touch probe 130 into contact with the measurement positions P1 and P2 to measure phases of teeth of the gears, respectively.SELECTED DRAWING: Figure 2

Description

The present invention relates to a gear phase measuring method and a gear processing apparatus.

A multi-stage gear having two or more gears needs to match the phase of each gear in order to be assembled with other parts. For example, Patent Document 1 states, ``A machining tool and a workpiece are relatively fed while rotating synchronously, and a plurality of gears (stepped gears: multistage gears) are attached to the workpiece by cutting the peripheral surface of the workpiece. A gear processing device for forming a gear (equivalent to a gear) is disclosed.

The gear processing apparatus of Patent Document 1 includes "a control device that controls synchronous rotation of a processing tool and the workpiece, and relative movement of the tool holding device and the workpiece holding device." Such a control device includes a phase shift detection section that detects a shift amount representing the magnitude of shift of the tooth phase of the correction target gear with respect to the tooth phase of the reference gear based on the detection result of the workpiece detection sensor; and a phase correction section that calculates a correction amount for correcting a tooth phase shift when finishing the correction target gear based on the shift amount detected by the shift detection section.

JP 2022-316 Publication

In the gear processing device of Patent Document 1, the workpiece W is "a stepped gear having a large diameter portion W1 and a small diameter portion W2, and spur teeth are formed in each of the large diameter portion W1 and the small diameter portion W2" ( (See paragraph 0018 and FIG. 2). If the workpiece is a spur gear as in Patent Document 1, the same value of the tooth phase is measured regardless of the position in the face width direction. However, when the workpiece is a helical gear, the measured tooth phase differs depending on the position in the face width direction. For this reason, the gear processing apparatus of Patent Document 1 cannot accurately measure the phase of the teeth of the helical gear, and there is room for further improvement.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a gear phase measuring method and a gear processing apparatus that can accurately measure the phase of teeth of a gear, particularly a helical gear.

In order to solve the above problems, a typical configuration of the gear phase measuring method of the present invention is such that, in the gear phase measuring method, a touch probe is brought into contact with the side surface of the gear to determine a reference position in the tooth width direction of the gear. Then, the center of the tooth width of the gear is specified as the measurement position based on the distance in the tooth width direction from the reference position, and the phase of the gear teeth is measured by bringing a touch probe into contact with the measurement position.

The above gear is a multi-stage gear, and one of the multi-stage gears is used as a reference gear, and a touch probe is brought into contact with the side surface of the reference gear to determine the reference position in the tooth width direction. The center of the tooth width of each stage of the multi-stage gear is specified as the measurement position based on the distance in the width direction, and the touch probe is brought into contact with the specified measurement position of each stage to measure the phase of the gear teeth of each stage. It is better to calculate the phase difference of the gear teeth.

In order to solve the above problems, a typical configuration of a gear processing device of the present invention is such that a gear processing device that processes a workpiece to manufacture a gear includes a work shaft that supports a workpiece, a tool shaft that supports a tool, and a gear processing device that processes a workpiece to manufacture a gear. , comprising a touch probe attached to the tool shaft and a phase measuring section that measures the phase of the gear, and the phase measuring section measures the tooth width of the gear by bringing the touch probe into contact with the side surface of the gear supported by the work shaft. A reference position in the direction is determined, the center of the tooth width of the gear is specified as a measurement position based on the distance from the reference position in the tooth width direction, and a touch probe is brought into contact with the measurement position to measure the phase of the gear teeth.

The touch probe may include a first stylus arranged in a direction substantially perpendicular to the rotation axis of the gear. Further, the touch probe has a second stylus arranged parallel to the rotation axis of the gear, and the phase measuring section detects the side surface of the gear with the second stylus, and detects the phase of the teeth of the gear with the first stylus. It's good to do that.

According to the present invention, it is possible to provide a gear phase measuring method and a gear processing apparatus that can accurately measure the phase of teeth of a gear, particularly a helical gear.

FIG. 1 is a diagram illustrating a gear processing device according to a first embodiment. FIG. 2 is a diagram showing details of the touch probe in FIG. 1 and a diagram showing the position of the touch probe in FIG. 1 during phase measurement. 2 is a flowchart illustrating a method for measuring a gear phase using the gear processing apparatus of FIG. 1. FIG. FIG. 2 is a diagram illustrating phase measurement of another gear by the gear processing device of FIG. 1. FIG. 2 is a flowchart illustrating another method of measuring the phase of a gear using the gear processing apparatus of FIG. 1. FIG. It is a figure explaining the gear processing device concerning a 2nd embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely illustrative to facilitate understanding of the invention, and do not limit the invention unless otherwise specified. In this specification and the drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to omit redundant explanation, and elements not directly related to the present invention are omitted from illustration. do.

(First embodiment)
FIG. 1 is a diagram illustrating a gear processing apparatus 100 according to the first embodiment. FIG. 1 illustrates a case where a workpiece 160 is processed to manufacture a multi-stage (two-stage gear is illustrated in this embodiment) gear. In this embodiment, a helical gear is exemplified as the gear to be manufactured, but the present invention is not limited to this, and the present invention can be applied to other gears such as spur gears. Note that the number of stages of the multi-stage gear shown in FIG. 1 is merely an example, and the number of stages of the gear may be three or more.

The gear processing apparatus 100 of the first embodiment rotates a tool 150 and a workpiece 160 synchronously, and processes the workpiece 160 with the tool 150 to manufacture a gear. Note that FIGS. 1 and 2 are diagrams in which gears have already been formed on the workpiece 160. As illustrated in FIG. 1, the work 160 of the first embodiment is a two-stage gear having a first gear 162 and a second gear 164. The first gear 162 has a larger diameter than the second gear 164.

As shown in FIG. 1, the gear processing apparatus 100 of the first embodiment includes a work shaft 110, a tool shaft 120, a touch probe 130, and an operation control section 140. Work 160 is supported on work shaft 110 and tool 150 is supported on tool shaft 120. Instead of the tool 150, other tools or the touch probe 130 can be attached to and detached from the tool shaft 120 by the ATC 102.

The operation control unit 140 controls the entire operation of the gear processing apparatus 100, such as drive control of the tool axis 120, work axis 110, etc. Then, the operation control unit 140 processes the workpiece 160 by moving the tool 150 and the workpiece 160 relatively while rotating the tool shaft 120 and the workpiece shaft 110 synchronously. Further, as will be described later, the operation control section 140 includes a phase measurement section 142 that measures the phase of the gear teeth.

FIG. 2 is a diagram showing details of the touch probe 130 in FIG. 1, and a diagram showing the position of the touch probe 130 in FIG. 1 during phase measurement. 2(a) is a diagram showing details of the touch probe 130 in FIG. 1, and FIG. 2(b) is a diagram showing the position of the touch probe 130 in FIG. 1 during phase measurement. Note that in the following description, a case where a test piece is used as the workpiece 160 will be exemplified, but it is of course possible to use the workpiece 160 itself to be actually machined instead of the test piece.

As shown in FIG. 2A, in the gear processing apparatus 100 of the first embodiment, the touch probe 130 includes a sensor section 132 and a first stylus 134 having a substantially L-shape. The first stylus 134 is arranged in a direction perpendicular to the rotation axis R of the gear (work 160), and has a ball 136, which is a detection point, arranged at its tip. The touch probe 130 is a device that applies a ball 136 at the tip to a workpiece 160 and reads the position of the detection point in coordinates on the machine tool side.

FIG. 3 is a flowchart illustrating a gear phase measurement method by the gear processing apparatus 100 of FIG. 1. As shown in FIG. 3, in the gear phase measurement method using the gear processing apparatus 100 of the first embodiment, the operation control unit 140 controls the first The gear 162 is machined (S302), and then the second gear 164 is machined (S304).

Note that if the tools 150 used to process the first gear 162 and the second gear 164 are different, the tools 150 are exchanged between S302 and S304. The ATC 102 can be used to replace the tool 150.

After processing the first gear 162 and the second gear 164, the operation control unit 140 supports the touch probe 130 on the tool shaft 120 instead of the tool 150 (S306). Next, the phase measuring unit 142 of the operation control unit 140 sets the first gear 162 of the processed workpiece 160 (strictly speaking, a gear) as a reference gear, and as shown in FIG. 162a with the touch probe 130 (ball 136 of the first stylus 134) to determine the reference position P0 in the tooth width direction WD (the axial direction of the gear) (S308).

As shown in FIG. 2B, the phase measurement unit 142 identifies the center of the tooth width of the first gear 162 as the measurement position P1 based on the distance in the tooth width direction WD from the reference position P0, and moves the touch probe 130 to the measurement position P1. (Ball 136 of first stylus 134) is brought into contact to measure the phase of teeth 162b of first gear 162 (S310).

Specifically, when the tooth width of the first gear 162 is W1, W1/2 at the center in the tooth width direction of the first gear 162 is the measurement position P1. Let L1 be the distance from the reference position P0 to the measurement position P1. Therefore, when measuring the phase of the teeth 162b of the first gear 162, the phase measuring unit 142 moves the touch probe 130 by L1 from the reference position P0 (side surface 162a of the first gear 162) and measures the touch probe 130. Place it at position P1.

As shown in FIG. 2B, the phase measurement unit 142 identifies the center of the tooth width of the second gear 164 as a measurement position P2 based on the distance in the tooth width direction WD from the reference position P0, and moves the touch probe 130 to the measurement position P2. (Ball 136 of the first stylus 134) is brought into contact to measure the phase of the teeth 164b of the second gear 164 (S312).

Specifically, when the tooth width of the second gear 164 is W2, W2/2 at the center of the second gear 164 in the tooth width direction becomes the measurement position P2. Let L2 be the distance from the reference position P0 to the measurement position P2. Therefore, when measuring the phase of the teeth 164b of the second gear 164, the phase measuring unit 142 moves the touch probe 130 by L2 from the reference position P0 (side surface 162a of the first gear 162) and measures the touch probe 130. Place it at position P2.

After identifying the tooth width centers of each stage (first gear 162 and second gear 164) of the workpiece 160 (machined gear) as measurement positions P1 and P2 in S310 and S312 described above, and measuring the tooth phase of each stage. The phase measuring unit 142 calculates the phase difference between the gears at each stage (S314), and determines whether the calculated phase difference is within a standard value (S316).

If the phase difference exceeds the standard value (NO in S316), the phase measurement unit 142 calculates a correction value based on the phase difference (S318). Examples of the correction value include the phase of the tool 150 and the cutting start position (timing of cutter feed) when machining the second gear 164. After calculating the correction value, the tool 150 replaces the workpiece 160 (test piece) supported on the workpiece shaft 110 (S320), and repeats the steps from S302 to S316. When the phase difference falls within the standard value (YES in S316), the phase measurement unit 142 ends the phase measurement.

As explained above, according to the gear processing apparatus 100 and the gear phase measurement method of the first embodiment, the center position in the face width direction of the first gear 162 and the second gear 164 is determined using the side surface of the reference gear as the reference position. can be specified. Therefore, it is possible to accurately measure the phase of the gear teeth at the measurement positions P1 and P2. Further, according to the above configuration, it is possible to complete everything from measuring the phase of the gear teeth to correction on the machine tool side, that is, within the machine, without using a special measuring device for measuring the phase.

FIG. 4 is a diagram illustrating phase measurement of another gear by the gear processing apparatus 100 of FIG. 1. FIG. 5 is a flowchart illustrating another method of measuring the phase of a gear by the gear processing apparatus 100 of FIG. In addition, in the following description, the same reference numerals are given to the same components and measurement steps as the gear processing apparatus 100 of the first embodiment and the gear phase measurement method using the same, and the description thereof will be omitted.

FIG. 4 illustrates a case where a single-stage gear (another gear) is manufactured instead of the multi-stage gear described above. In another gear phase measurement method shown in FIG. 4, as shown in FIG. 5, the operation control unit 140 processes the gear of the workpiece 260 (test piece) using the tool 150 supported by the tool shaft 120 (S402).

Next, the operation control unit 140 functions as a phase measurement unit 142, and brings the touch probe 130 (ball 136 of the first stylus 134) into contact with the side surface 262a of the workpiece 260 (gear) supported by the workpiece shaft 110 to determine the tooth width. A reference position P0 in the direction WD (the axial direction of the gear) is determined (S404).

As shown in FIG. 2B, the phase measurement unit 142 specifies the center of the tooth width (W1/2 position) of the gear 260 as the measurement position P1 based on the distance in the tooth width direction WD from the reference position P0. Let L1 be the distance from the reference position P0 to the measurement position P1. Then, the phase measurement unit 142 moves the touch probe 130 by L1 from the reference position P0, brings the touch probe 130 (ball 136 of the first stylus 134) into contact with the measurement position P1, and measures the phase of the gear tooth 262b ( S406). As described above, according to the gear processing apparatus 100 of the first embodiment and the gear phase measuring method using the same, it is possible to accurately measure the phase of the first gear.

(Second embodiment)
FIG. 6 is a diagram illustrating a gear processing apparatus 200 according to the second embodiment. FIG. 6(a) is a diagram showing details of the touch probe 230 of the gear processing device 200 of the second embodiment, and FIG. 6(b) is a diagram showing the details of the touch probe 230 of the gear processing device 200 of the second embodiment during phase measurement. 3 is a diagram showing the position of a touch probe 230. FIG.

In addition to the substantially L-shaped first stylus 134, the 200 touch probes 230 of the second embodiment further include a linear second stylus 234. The second stylus 234 is arranged parallel to the rotation axis R of the gear (work 160), and has a ball 236, which is a detection point, arranged at its tip.

In the gear phase measurement method using the gear processing apparatus 200 of the second embodiment, in S308 shown in FIG. The reference position P0 in the tooth width direction WD (the axial direction of the gear) is determined by bringing the ball 236 of the second stylus 234 into contact. In the phase measurement of the teeth of the first gear in S310 and the phase measurement of the teeth of the second gear in S312, the ball 136 of the substantially L-shaped first stylus 134 is used as in the gear phase measurement method of the first embodiment. bring into contact.

Even with a configuration including two touch probes like the gear processing apparatus 200 of the second embodiment, it is possible to specify the center position in the tooth width direction of each stage of a multistage gear. Therefore, it is possible to accurately measure the phase of the teeth of multi-stage gears at the measurement positions P1 and P2, and the same effects as the gear processing device 100 of the first embodiment and the gear phase measurement method using the same can be obtained. I can see it.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the claims, and these naturally fall within the technical scope of the present invention. Understood.

INDUSTRIAL APPLICATION This invention can be utilized as a gear phase measuring method and a gear processing apparatus.

P0... Reference position, P1... Measurement position, P2... Measurement position, 100... Gear processing device, 102... ATC, 110... Work axis, 120... Tool axis, 130... Touch probe, 132... Sensor section, 134... First stylus , 136... Ball, 140... Operation control section, 142... Phase measurement section, 150... Tool, 160... Workpiece, 162... First gear, 162a... Side surface, 162b... Teeth, 164... Second gear, 164b... Teeth, 200 ... Gear processing device, 230 ... Touch probe, 234 ... Second stylus, 236 ... Ball, 260 ... Workpiece, 262a ... Side surface, 262b ... Teeth, R ... Rotation axis, WD ... Face width direction

Claims (5)

In the gear phase measurement method,
determining a reference position in the tooth width direction of the gear by bringing a touch probe into contact with a side surface of the gear;
Identifying the center of the tooth width of the gear as a measurement position based on the distance in the tooth width direction from the reference position,
A gear phase measuring method, comprising: measuring the phase of teeth of the gear by bringing the touch probe into contact with the measurement position. The gear is a multi-stage gear,
One gear of the multi-stage gear is a reference gear,
determining the reference position in the tooth width direction by bringing the touch probe into contact with a side surface of the reference gear;
Identifying the center of the face width of each stage of the multi-stage gear as a measurement position based on the distance in the face width direction from the reference position,
10. A method of calculating a phase difference between gear teeth of each stage by bringing the touch probe into contact with the specified measurement position of each stage to measure a phase of gear teeth of each stage. 1. The gear phase measurement method described in 1. In gear processing equipment that processes workpieces to manufacture gears,
a work shaft supporting the work;
a tool shaft that supports the tool;
a touch probe attached to the tool axis;
a phase measuring unit that measures the phase of the gear;
Equipped with
The phase measuring section includes:
determining a reference position in the tooth width direction of the gear by bringing the touch probe into contact with a side surface of the gear supported by the work shaft;
Identifying the center of the tooth width of the gear as a measurement position based on the distance in the tooth width direction from the reference position,
A gear processing device characterized in that the phase of the gear teeth is measured by bringing the touch probe into contact with the measurement position. The gear processing device according to claim 3, wherein the touch probe includes a first stylus arranged in a direction substantially perpendicular to the rotation axis of the gear. The touch probe has a second stylus arranged parallel to the rotation axis of the gear,
The phase measuring section includes:
detecting a side surface of the gear with the second stylus;
5. The gear processing apparatus according to claim 4, wherein the first stylus detects a phase of teeth of the gear.

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