JP2552926B2 - Gear grinding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an index unit that creates a tooth-cut work piece by index rotation for one pitch of teeth, and a grindstone for grinding the teeth of the work piece. The present invention relates to a method of grinding a gear using a gear grinding machine having the above.

(Prior Art) Tooth thickness is an important control item in gear machining, and in order to automatically measure the tooth thickness, according to Japanese Patent Laid-Open No. 61-70401, a tentacle that can be fitted in a tooth trough is provided. Using a tooth thickness measurement unit equipped with a detector for detecting the insertion depth, it is known that the tooth thickness is measured from the insertion depth of the probe to the root of the tooth, and the publication further discloses that. Also discloses that a gear thickness measuring unit is mounted on a hobbing machine for gear cutting to automate gear cutting.

(Problems to be solved by the invention) In a gear grinding machine, the tooth thickness is likely to vary due to the wear of the grindstone, and the tooth thickness is measured to correct the cutting amount of the grindstone during the next gear machining, or It is desirable to determine when to dress.

Further, since the grinding of the gear is performed on the work that has undergone gear cutting in advance, it is necessary to accurately set the phase of the work in the index unit of the grinding machine and set it. This phase determination is generally performed using a knock pin. However, this makes the work of setting the work cumbersome, and thus it is desired that the phase can be determined more easily.

In view of the above points, the present invention has an object to provide a method for applying the above-mentioned conventional technique to a gear grinding machine so that tooth thickness measurement and workpiece positioning can be performed simply and efficiently. There is.

(Means for Solving the Problem) In order to achieve the above object, in the present invention, a gear provided with an index unit for index-rotating one pitch of the teeth created on the work and a grindstone for grinding the teeth of the work. In a method of grinding a gear using a grinder, a tooth thickness measuring unit including a tentacle that can be fitted into a tooth trough of a workpiece and a detector that detects a fitting depth of the tangent is provided in the index unit. The work is fixed on the work receiving surface after the tentacles are fitted into the roots of the work set on the work receiving surface of the index unit, and then the work is fixed on the work receiving surface. While grinding the teeth of the work by the grindstone while rotating the work index, by inserting the tentacle into the valley portion of the ground tooth, the tentacle of the tentacle detected by the detector The tooth thickness was measured from the insertion depth.

(Working) If the tooth thickness measurement unit is arranged so that the phase difference in the circumferential direction of the work between the grinding processing position by the grindstone and the fitting position of the contact is an integer multiple of the work tooth pitch, By inserting a tentacle into the dent portion near the tentacle of the workpiece roughly set on the work receiving surface of the index table and matching the dent portion with the tentacle, a different dent portion is formed at the grinding position. The work is phased so that the values match with each other, and thereafter, each time the index rotation is performed by the index unit, each tooth trough is sequentially indexed to the grinding processing position, and accurate grinding is performed by the grindstone.

Then, when any of the grinded roots reaches the contact fitting position, the rod is fitted into the root part to measure the tooth thickness, and the cutting amount of the grindstone is corrected when the next workpiece is ground. And regrinding the workpiece if necessary. In this case, it is desirable to fit the contact pieces into the tooth troughs and obtain the average value of the tooth thickness.

(Example) FIG. 1 and FIG. 2 show a gear grinding machine for bevel gears,
On a bed (1), a spindle head (3) for pivotally supporting a spindle having a cup-shaped grindstone (2) and a swivel base (4) are arranged side by side, and both side faces of the swivel base (4) are respectively arranged. Elevating plates (5) (5) are attached, and an index unit (6) for holding a work W as a bevel gear material is mounted on each of the elevating plates (5), and one index unit ( 6) is selected as a machining position facing the spindle head (3) by swiveling the swivel base (4), and the index unit (6) rotates the work W by one index of the teeth created by the index unit (6), Grinding with a grindstone (2) was performed.

The index unit (6) includes a base (7) fixed to the lift plate (5), and an index table (8) provided on the base (7) for index rotation by an index mechanism therein. And the work receiving surface (8a) on the front surface of the table (8) as shown in FIG.
And a disc spring-shaped clamp member (9) for expanding and clamping the workpiece W from the inner peripheral side, and the clamp member (9) is axially moved by an operation rod (9a) penetrating the index table (8). The work W is fixed to the receiving surface (8a) by compressing in the direction.

Further, the index unit (6) is provided with a tentacle (11) which can be fitted into the tooth trough Wa of the work W and a detector (12) which detects a fitting depth of the tentacle (11). A measurement unit (10) is provided, which will be described in detail with reference to FIGS. 3 to 5, in a guide block (13) fixedly provided on the peripheral surface of the base (7). The guide groove (13
A base frame (14) which is engaged with a slider (14a) via a slider (14a) and is slidably supported in the tangential direction of the index table (8) is provided, and a pair on the base frame (14) is provided. Legs (14
Between the b) and (14b), a swinging arm (15) having the tentacle (11) attached to its tip is pivotally supported by a rotary shaft (15a) at its root, and the arm (15) is attached to the base frame (14). A cylinder (16) attached to the arm (15) allows it to swing between a working position on the work W side and a non-working position separated from the work W via a link (16a), and a projection extending to the root of the arm (15). (15
detector consisting of an electric micrometer (1) facing b)
2) is attached to the base frame (14) via the holder (12a),
The detector (12) is adapted to detect the depth of insertion of the contact (11) into the root portion Wa.

The guide block (13) is provided with leg pieces (13b) (13b) located on both sides of the base frame (14) in the sliding direction, and the one side leg piece (13b) is provided with the base frame (14). Of the slide adjustment member (17) and the leg piece (13b) on the other side.
8) is provided, and the phase difference in the circumferential direction of the work W between the grinding processing position a by the grindstone (2) and the fitting position b of the contactor (11) is an integral multiple of the tooth pitch of the work W. As described above, the position of the base frame (14) can be finely adjusted.

The stay (14c) extending from one leg piece (14b) on the base frame (14) cooperates with the detection piece (19a) attached to the rotating shaft (15a) to swing the arm (15). ) Is attached with a pair of proximity switches (19) and (19) for detecting the swinging between the operative position and the inoperative position. In the figure (20) is the rotating shaft (15a)
It is a cap that protects the shaft support.

When grinding the work W, first, the work W is roughly set on the work receiving surface (8a) using the clamp member (9) as a centering guide, and then the swing arm (15) of the tooth thickness measuring unit (10). Is oscillated to the operating position, and the tentacle (11) is fitted into the valley portion Wa in the vicinity thereof. According to this, tentacles (11)
The workpiece W is phased based on the
The tooth trough portion Wa in the vicinity of is accurately indexed to the position a.

Next, the operation rod (9a) is pulled toward the base (7) side by a clamp cylinder (not shown) to compress and expand the diameter of the clamp member (9) to fix the work W to the work receiving surface (8a).

After that, the swing arm (15) is swung to the inoperative position, the spindle head (3) is moved forward, and the grindstone (2) is cut into the tooth gap Wa existing at the grinding position a while rotating. Grinding is performed, and after the machining is completed, the spindle head (3) is once retracted, the index (8) is index-rotated by one pitch, and the next root portion is indexed to the grinding position a and the spindle head (3) is moved. The teeth of the work W are ground in order by advancing again and repeating this.

When one of the ground troughs Wa, which has been ground, reaches the contact fitting position b, the swing arm (15) is swung to the operating position to fit the contact (11) into the contact trough Wa. Then, the tooth thickness is measured from the insertion position of the contactor (11) detected by the detector (12).

It is desirable that this measurement can be performed during the grinding process. Therefore, in this embodiment, the tooth thickness measuring unit (10) is set at the grinding position a so that the swing arm (15) does not interfere with the grindstone (2). It was arranged in a substantially symmetrical position.

(Effects of the Invention) As is apparent from the above description, according to the present invention, the tooth thickness of a workpiece ground by the tooth thickness measuring unit attached to the index unit can be measured, and the workpiece can be set by the measuring unit. The phase determination can be performed easily and efficiently, and a dedicated member is not required for the phase determination, which is effective in reducing the equipment cost.

[Brief description of drawings]

FIG. 1 is a side view of a gear grinding machine used for carrying out the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a partially cut front view of a tooth thickness measuring unit, and FIG. 4 is IV-IV of FIG. FIG. 5 is a side view of the tooth thickness measuring unit as seen from the line VV in FIG. W: Work, Wa: Tooth root (2): Grindstone, (6): Index unit (8a): Work receiving surface, (10): Tooth thickness measuring unit (11): Tactile , (12) …… Detector

Front Page Continuation (72) Inventor Satoshi Takahashi 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Within Honda Engineering Co., Ltd. (56) References JP 62-282817 (JP, A) JP 59-8493 (JP, B2) S. 58-48026 (JP, Y2)

Claims (1)

(57) [Claims] 1. A method of grinding a gear using a gear grinding machine, comprising: an index unit for rotating a workpiece by one index pitch rotation of teeth; and a grindstone for grinding the teeth of the work. To
Provided is a tooth thickness measuring unit that includes a tentacle that can be freely fitted into the root portion of the workpiece and a detector that detects the depth of fitting of the tentacle.
After the tentacles are inserted into the roots of the work set on the work receiving surface of the index unit to phase the work, the work is fixed on the work receiving surface, and then the work is fixed by the index unit. Grind the teeth of the work with the grindstone while rotating the index, insert the tentacle into the valley of the ground tooth, and measure the tooth thickness from the insertion depth of the tentacle detected by the detector. A gear grinding method characterized in that