JPH07102483B2 - Gear processing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining method for cutting gears, in which the center distance between a gear cutting tool and a master gear is read and this value is input into a numerically controlled gear cutting machine to obtain a predetermined cutting depth.

[0002]

2. Description of the Related Art In gear cutting, in order to facilitate the setting of the cutting depth, it is common to use NC machines for hobbing machines and gear shapers, and to attach digital scales to gear cutting machines such as conventional hobbing machines. However, the numerical value of the cutting depth has traditionally been determined by measuring the outer diameter of a gear cutting tool such as a hob or pinion cutter,
From this, the tooth thickness at that time is calculated as
The outer diameter and tooth depth values set in the previous calculation were used to determine the required value, and then the value was set in the gear cutting machine.

[0003]

[Problem to be Solved by the Invention] However, the relationship between the outer diameter dimension and the tooth thickness of the gear to be cut after the gear cutting tool has been re-ground cannot be calculated simply by a formula, and therefore the specified depth of cut cannot be obtained by cutting only once. First, cutting is performed with an estimated depth of cut, and the tooth thickness of this gear to be cut is measured as the over-pin diameter using a tooth thickness micro-gauge. If the depth of cut is insufficient, cutting is performed again with the estimated depth of cut a third time, and the above measurement is repeated to obtain the specified dimension.
Ultimately, gear cutting using the conventional method for setting the depth of cut required a significant amount of setup time, and the benefits of NC control in gear cutting machines such as hobbing machines and gear shapers were not fully utilized. However, in the specification of Japanese Utility Model Laid-Open Publication No. 171126/1981, a gear cutting device is shown in which, in order to reduce the time required for trial cutting of a gear to be cut on a gear cutting machine, the center distance between the table and the cutter spindle of the gear cutting machine is calculated in advance from the gear cutting tool specifications, the outer diameter of the gear cutting tool, and the specifications of the workpiece using a theoretical calculation formula, and the table is moved while a displacement sensor reads the table movement distance until the calculated value is reached and the table is moved to perform gear cutting.However, this involves separately measuring the outer diameter of the gear cutting tool, and then turning the cutting handle while watching the digital display until the value of the center distance between the table and the cutter spindle is reached, calculated using the theoretical calculation formula based on this depending on whether the tool is new or reground.However, this does not involve measuring the center distance between the actual gear cutting tool and an accurate master gear on a measuring table in order to give an accurate depth of cut to the gear to be cut, and in particular does not involve measuring and setting the actual center distance of the gear cutting tool after reground .
In the publication of No. 8-35388, a gear cutting tool is provided with a gear cutting tool.
A table is placed on which the master tooth is placed.
A device for supporting and rotating a wheel or a gear to be processed and the
Measurement that can be engaged with or disengaged from a master gear or a gear to be processed
a gear is provided, and the master gear or the gear to be machined and the
When the gear is engaged with the test gear, the change in the center distance between the two is detected.
A detection device is provided to detect the change in the distance between the axes.
The table is moved relative to the gear cutting tool.
The tooth thickness of the gear to be machined is adjusted by
The tooth thickness adjusting device for a gear cutting machine is shown.
However, this technology is based on the tooth thickness adjustment device provided on the gear cutting machine.
By this positioning, first the measurement gear is backed up against the master gear.
Press to zero the rush to obtain the "reference value", then
The gear to be processed, which has some teeth formed, is meshed with the gear to be measured.
Then we get a "certain value" by adding them together, and then we calculate the difference between these two "values" as
The additional cutting amount is obtained by detecting the cutting amount.
As with the technology described in the publication, the actual gear cutting tool is placed on the measuring table.
It does not measure the center distance to the master gear accurately.
In particular, the actual center distance of the gear cutting tool after re-sharpening is measured.
In view of the above, the present invention has been made.
This was devised to provide a machining method for obtaining gears with accurate tooth thickness by measuring the center distance between the gear cutting tool and the master gear on a measuring table to set the cutting depth of the gear cutting tool when cutting gears, and then inputting this data into a numerically controlled gear cutting machine.

[0004]

In order to achieve the above object, the gear machining method of the present invention is characterized in that one of the master gear and its gear cutting tool is fixed on a measuring table , and the other is slid to mesh with each other without backlash, and the center distance between the two is read by a scale and a sensor, and this is input into the control device of a numerically controlled gear cutting machine to set the cutting depth of the gear cutting tool, and machining is then carried out.

[0005]

[Operation] In accordance with the present invention, a gear cutting tool to be measured, such as a hob, is fitted onto the support shaft of the hob support member, which is the fixed shaft member. The inclination angle of the hob's cutting edge is set using the cylindrical support member attached to the fixed shaft member and the scale on the cylindrical member rotatably supported on the indicator member, and the hob is tilted. After determining several measurement points on the circumference of the hob, the master gear support member, which is the sliding shaft member, is moved toward the fixed shaft member, and the master gear is meshed with the hob without backlash. The center distance between the hob and the master gear at this time is read by a sensor in the numerical reading mechanism as a numerical value on the scale of a digital scale attached along the sliding direction of the sliding shaft member, and displayed on a digital counter, if necessary. A more accurate value can be obtained by measuring several of the measurement points in the same way and averaging the values. This center distance value is displayed on the digital counter and, if inputted into the numerically controlled gear cutting machine (or not displayed), the amount of cutting depth of the hob at that time is automatically determined, enabling the machining of gears with accurate tooth thickness.

[0006]

1 and 2 show an apparatus for measuring the center distance between a hob, which is a gear cutting tool used in the machining method of the present invention, and a master gear, which is attached to a gear cutting machine (not shown). The measuring apparatus has a measuring table 1 on one side,
In this case, the hob support member 2, which is a fixed shaft member, is fixed.
The other side of the measuring table 1 can be moved by a sliding groove 1a.
In this case, a master gear support member 3 is provided as a sliding shaft member. The hob support member 2 is composed of a support column 4 having a cylindrical support portion 4a erected on the measuring table 1, a cylindrical portion 5a fitted and supported by the cylindrical support portion 4a, and a hob support portion 5 having a support shaft 6 of the hob H perpendicular to the axis of the cylindrical support portion 4a.
The cylindrical support portion 4a and the cylindrical portion 5a are provided with angle scales 7a and 7b.
The master gear support member 3 comprises a cylindrical portion 8 on which a fitting shaft 8a of the master gear M is formed, and a protrusion 8b formed on the bottom of the cylindrical portion 8 fits into the sliding groove 1a provided in the measuring table 1 at right angles to the support shaft 6. Reference numeral 9 denotes a digital scale on which graduations 9a are engraved. The scale 9a faces the cylindrical portion 8 and is disposed on the measuring table 1 close to it and parallel to the sliding groove 1a. Reference numeral 10 denotes a digital scale value reading sensor which is attached to the side of the cylindrical portion 8 of the master gear support member 3 facing the digital scale 9 and is configured to optically read the opposing graduations 9a, convert them into electrical values, and send them to a digital counter 12 via conductors 11. The digital scale 9, value reading sensor 10, and digital counter 12 constitute a value reading mechanism. In addition, a conductor 11' branched from the conductor 11
3 and 4 show another embodiment of the device for measuring the center distance between the pinion cutter and the master gear used in the method of the present invention, which is the same as the device shown in FIGS.
Contrary to the one shown in the figure, the master gear M is fixed, and the pinion cutter C is moved and meshed with the master gear M. That is, the master gear M is placed on one side of the measuring table 1.
The other side of the measuring table 1 is provided with a cylindrical portion 14 having a fitting shaft 14a of the pinion cutter C.
a cutter support portion 15 as a sliding shaft member,
A convex portion 14b formed on the bottom of the cylindrical portion 14 is fitted into a sliding groove 1a formed in the measuring table 1 parallel to the center line X passing through the axis of the shaft 13a. A sensor 10 connected to a digital counter 12 by a conductor 11 is attached to the cylindrical portion 14, facing the scale 9a of a digital scale 9 installed parallel to the sliding groove 1a. As with the devices shown in Figures 1 and 2, a conductor 11' branched from the conductor 11 is connected to a program setting panel (not shown) of the numerically controlled gear cutting machine. In the measuring device of the above embodiment, with the pinion cutter C fitted to the fitting shaft 14a, the cutter support portion 15 is moved along the sliding groove 1a, and the cutter C is brought into mesh with the master gear M without backlash. As a result, in the same manner as described above, the center distance between the pinion cutter C and the master gear M is read by the sensor 10 of the numerical value reading mechanism as a numerical value on the scale 9a of the digital scale 9 and displayed on the digital counter 12 (or not), and by inputting this center distance value into the numerically controlled gear shaper, the cutting depth of the pinion cutter at that time is automatically determined, making it possible to cut gears with accurate tooth thickness.

[0007]

The gear machining method according to the present invention is
One of the master gear and its gear cutting tool is fixed on the table , and the other is slid to mesh with each other without backlash, and the center distance between the two at that time is read by a scale and a sensor, and this is input into the control device of the numerically controlled gear cutting machine to set the cutting depth of the gear cutting tool, and processing is then carried out. Therefore, by simply moving the sliding shaft member and meshing the gear cutting tool and master gear without backlash,
The center distance between the gear cutting tool and the gear to be machined can be accurately and automatically input into the numerically controlled gear cutting machine, which allows the amount of cutting by the gear cutting tool to be accurately determined, enabling gears with the correct tooth thickness to be machined.

[Brief explanation of the drawings]

FIG. 1 is a front view showing an embodiment of a device for measuring the center distance between a gear cutting tool and a master gear used in a gear machining method of the present invention.

2 is a plan view of the measuring device shown in FIG. 1;

FIG. 3 is a front view showing another embodiment of a measuring device for measuring the center distance between a gear cutting tool and a master gear used in the method for machining gears of the present invention.

[Figure 4] A plan view of the measuring device shown in Figure 3. 1. Measurement table 1a. Sliding groove 2. Hob support member 3. Master gear support member 4. Support column 5. Hob support portion 6. Support shaft 7a, 7b. Angle scale 8. Cylindrical portion 8a. Mating shaft 8b. Convex portion 9. Digital scale 10. Numerical reading mechanism 11, 11'. Conductive wire 12. Digital counter 13. Master gear support member 14. Cylindrical portion 14a. Cutter mating shaft 15. Cutter support portion

Claims (1)

[Claims] [Claim 1] A method for machining gears, characterized in that one of the master gear and its gear cutting tool is fixed on a measuring table , and the other is slid to mesh with each other without backlash, and the center distance between the two is read using a scale and a sensor, and this is input into the control device of a numerically controlled gear cutting machine to set the cutting depth of the gear cutting tool, and machining is then carried out.