JPH0785846B2 - Internal gear type honing grindstone processing method and centering and fixing device used therefor - Google Patents

Description

The present invention relates to a method for processing an internal gear type honing grindstone and a centering and fixing device used for the method.

[Conventional technology]

Honing wheels for gears are gear honing processing, that is, removal of dents and heat treatment distortion after gear cutting, reduction of tooth groove runout and processing error, improvement of accuracy of tooth surface, tooth profile, lead, and To reduce noise due to
Used in finishing gears.

Among the above-described gear honing grindstones, a method of processing an internal gear type honing grindstone and a centering and fixing device used therefor have been generally as follows.

First of all, the internal gear type honing grindstone is formed by forming a grindstone material (herein, the grindstone material is an abrasive grain, a binder curing agent, an additive) between an outer mold of a short cylindrical shape and an inner mold corresponding to a master gear. Etc. (hereinafter the same) is poured and sintered to form a short cylindrical grindstone with internal teeth on the inner peripheral part (see FIGS. 4, 5, 6 and 11). In the present specification and drawings, the grindstone (4) or the grindstone (4 ′) means a grindstone (material) before or during cutting.

Next, as shown in FIG. 11, the outer circumference of the grindstone (4 ') is clamped and fixed by the chuck (21') at the tip of the work spindle (9 ') of the lathe while centering the outer diameter and the inner diameter. In this state, first, the inner peripheral portion is cut to a predetermined inner diameter. Thereafter, the grindstone (4 ') is once removed from the chuck (21'), and this time the chuck (21 ') is fixed from the inner peripheral side, and the outer peripheral surface is cut to a predetermined outer diameter. In some cases, the inner peripheral side of the grindstone is first chucked and the outer peripheral surface is cut, then once removed and chucked on the outer peripheral side to grind the inner peripheral part.

[Problems to be Solved by the Invention]

However, the above-described conventional method of processing an internal gear type honing grindstone and the centering and fixing device used therefor have the following problems.

i) Since the outer peripheral portion of the grindstone is clamped by the chuck, if the grindstone has a small wall thickness, distortion occurs in the radial direction and the circularity of the outer diameter and the inner diameter is not averaged.

Also, depending on the length of the chuck claw, only about half the width of the grindstone is clamped, and as with the above, the circularity of the outer and inner diameters is not averaged, and the parallelism of the width of the grindstone and the fluctuation of the tooth groove Also caused an error.

ii) At the time of cutting, for example, after cutting the inner circumference of the grindstone, the grindstone is once removed from the chuck, and this time it is fixed from the inner circumference to cut the outer peripheral surface, which requires removal and reattachment work. is there. Therefore, a replacement error occurred, and the processing accuracy of the honing stone was not always good.

The present invention is intended to solve the problems of the above-described conventional method for processing an internal gear type honing grindstone and the centering and fixing device used therein. That is, the object of the present invention is, during the cutting process of the internal gear type honing grindstone, the circularity of the outer diameter and the inner diameter is averaged without distortion in the radial direction, and the parallelism of the width of the grindstone and the deflection of the tooth space are reduced. Error does not occur, and moreover, the cutting work of the inner and outer circumferences of the grindstone can be performed without removing and reattaching it on the way so that no replacement error occurs, thereby improving the working accuracy, workability and productivity. An object of the present invention is to provide a method of processing an internal gear type honing grindstone that can be greatly improved, and a centering and fixing device used therefor.

Configuration of the Invention [Means for Solving the Problems] a) First, in the method for processing an internal gear type honing grindstone of the present invention, a grinding stone material (3) is sintered and an internal tooth portion (5) is formed on the inner peripheral portion. , A grindstone (4) having mounting bolt insertion holes (7) formed at equal intervals in the circumferential direction on the side surface portion (6), and mounting bolt insertion holes (7) of the side surface portion (6). Insert the mounting bolt (8) into the work spindle (9) of the cutting machine.
Temporary tightening on the side surface of the support plate (10) at the tip, and the inner tooth portion (5) on the inner circumference of the grindstone (4) and the support plate (10)
Between the protruding reference guide boss (11) at the center of the side surface,
The centering jig (12) having an outer peripheral surface (13) having a taper shape is engaged and pushed in while interposing the balls (14) in the inner tooth portion (5) at equal intervals, and then the mounting bolt ( 8) Fully tighten and fix the grindstone (4) to the side surface of the support plate (10), and then remove the centering jig (12) to remove the inner and outer peripheral surfaces of the grindstone (4) in this fixed state. A cutting machine is used to perform cutting so that the inner and outer diameters are predetermined.

b) Next, the first centering and fixing device used in the method for processing the internal gear type honing grindstone is a supporting plate (10) attached to the tip of the work spindle (9) of the cutting machine, and a centering jig (12). ), The support plate (10) has a reference guide boss (11) projecting from the center, and a bolt insertion hole formed in the side surface (6) of the grindstone (4) near the outer periphery. A screwing hole (15) for a mounting bolt (8) engageable with (7) is formed, and a centering jig (12) supports an inner tooth portion (5) on the inner circumference of the grindstone (4). Reference guide boss (1
1) The support plate (1
Boss hole (1) that can be fitted into the reference guide boss (11) of (0)
6) and the inner peripheral tooth portion (5) of the grindstone (4) on the outer peripheral portion, a tapered outer peripheral surface (13) capable of centering with a ball (14) interposed. is there.

c) The second centering and fixing device used in the method for processing the internal gear type honing grindstone is a support plate (10) attached to the tip of the work spindle (9) of the cutting machine, and a centering jig (12). The support plate (10) has a reference guide boss (11) protruding from the central portion thereof, and a bolt insertion hole (formed on the side surface portion (6) of the grindstone (4) near the outer periphery ( 7) The mounting bolt (8) capable of fitting the 7) is projected, and the centering jig (12) is provided on the inner tooth portion (5) of the inner periphery of the grindstone (4) and the central portion of the side surface of the support plate (10). Standard guide boss (1
1) The support plate (1
Boss hole (1) that can be fitted into the reference guide boss (11) of (0)
6) and the inner peripheral tooth portion (5) of the grindstone (4) on the outer peripheral portion, a tapered outer peripheral surface (13) capable of centering with a ball (14) interposed. is there.

[Action]

The processing method of the internal gear type honing grindstone of the present invention and the implementation / use state of the centering and fixing device used therefor are as follows.

The grinding stone (4) to be cut by the means of the present invention is formed by
First, as shown in FIG. 4, FIG. 5, and FIG. 6, a grinding stone material (3) is poured between a short cylindrical outer die (1) and an inner die (2) corresponding to a master gear, Sintering is performed into a short cylindrical shape having an inner tooth portion (5) at the peripheral portion, but this point is almost the same as the conventional one. However, bolt insertion holes (7) are formed in the side surface portion (6) of the grindstone (4) at equal intervals in the circumferential direction (see FIG. 6).

Next, the grindstone (4) is attached to the side surface of the support plate (10) provided on the tip of the work spindle (9) of the lathe which is a cutting machine,
Mounting bolts (8) in the bolt insertion holes (7) of the whetstone (4)
Insert and temporarily tighten. At that time, the support plate (10)
In the case where the bolt screw hole (15) is formed in the bolt, the mounting bolt (8) is inserted into the bolt insertion hole (7) of the grindstone (4), and the bolt (8) is attached to the bolt of the support plate (10). It may be screwed into the screw hole (15) and temporarily tightened (see FIG. 1).

In the case where the mounting bolt (8) is provided on the side surface of the support plate (10) in a protruding manner (see FIG. 10), the grindstone (4) is attached to the mounting bolt (8) by the bolt insertion hole (7). Then, the support plate (10) may be temporarily tightened.

Next, a centering jig (12) is installed in the grindstone (4) in the circumferential direction between the inner tooth portion (5) of the former (4) and the tapered outer peripheral surface (13) of the latter (12). The balls (14) are evenly spaced between the reference guide bosses (11) of the support plate (10).
The boss hole (16) of the centering jig (12) is fitted into and engaged with. By engaging the centering jig (12), the tapered outer peripheral surface (13) pushes the internal tooth portion (5) through the ball (14), so that the grindstone (4) is aligned. Centering is easily performed (see FIG. 1).

In the above case, unlike the conventional case, the outer peripheral portion of the grindstone (4) is not clamped and fixed while the outer and inner diameters are centered by the chuck at the work spindle tip of the lathe. Therefore, even if the thickness of the grindstone is thin, there is no distortion in the radial direction, the circularity of the outer and inner diameters will be equalized, and the jaws of the chuck will be short and the width of the grindstone will be parallel. It also eliminates the error in the degree and run of the tooth space.

In addition, the centering jig (12) has a female screw hole (20) capable of being fitted to the male screw portion (18) formed on the reference guide boss (11) for engaging the grindstone (4). If the tightening ring (19) is used and is fitted (see FIGS. 8 and 9), the workability at the time of engagement is improved.

Thereafter, in the state where the centering is performed as described above, the provisionally tightened mounting bolt (8) is fully tightened, the grindstone (4) is fixed to the side surface of the support plate (10), and the centering jig ( 12) ・ Remove the ball (14). Then, the whetstone (4) in the fixed state may be cut into a predetermined inner diameter and outer diameter by connecting the inner peripheral portion and the outer peripheral surface with each other, or simultaneously by a general-purpose lathe as a cutting machine (first). (See Figure 3).

In this case, since the outer peripheral portion is cut after the inner peripheral portion is cut as in the conventional case, it is not necessary to temporarily remove the grindstone from the chuck with the outer peripheral portion fixed and then fix the grindstone again. In addition, since there is no need to remove and reattach the whetstone (4), no replacement error will occur,
The processing accuracy will be improved.

〔Example〕

The grinding stone (4) to be cut by the means of the present invention is molded by placing the outer mold (1) and the inner mold (2) on the rotary table (22) and pouring the grinding stone material while rotating. Then heat and sinter. As the above-mentioned grindstone material, for example, aluminum oxide or silicon carbide may be used as the abrasive grains, liquid epoxy resin as the binder (hardening agent), and calcium carbonate as the additive, and these may be mixed.

In addition, the mounting bolt insertion hole (7) is formed by standing a plurality of cylindrical members at regular intervals in the circumferential direction between the outer die (1) and the inner die (2) before pouring the grindstone material. It can be installed and removed after the grindstone is formed. However, the present invention is not limited to this, and the grindstone may be perforated with a drill or the like after being sintered and formed. Although the number of the bolt insertion holes (7) is four in the illustrated example, the number is not limited to this and may be increased appropriately according to the size of the grindstone (4) and the like.

In order to attach the grindstone (4) to the support plate (10), in FIG. 1, FIG. 2, FIG. 3, FIG. 8 and FIG. It is inserted through the hole (7), screwed into the bolt screw hole (15) of the support plate (10), and tightened. However, as shown in FIG. 10, the mounting bolt (8) is provided so as to project from the support plate (10), and the bolt (8) is fitted with the bolt insertion hole (7) of the grindstone (4). You may make it tighten with a nut (17).

Further, a large number of bolt screw holes (15) are formed in the support plate (10), and appropriate screw holes are formed according to the bolt insertion holes (7) having different positions depending on the size of the grindstone (4) and the like. The wearing hole (15) may be selected and used.

The engagement of the centering jig (12) into the grindstone (4) is made by pushing it in FIGS. 1, 2, and 3.
However, as shown in FIGS. 8 and 9, the reference guide boss (11) is formed with a male screw portion (18), and a tightening ring (19) having a female screw hole (20) that can be screwed therein is prepared. Alternatively, the tightening ring (19) may be screwed from the rear portion of the centering jig (12) to tighten.

EFFECTS OF THE INVENTION As is clear from the above, the method for processing an internal gear type honing grindstone according to the present invention, and the centering and fixing device used for the method,
The following effects are achieved.

B) The circularity of the outer diameter and the inner diameter of the grindstone is averaged, and there is no error in the parallelism of the grindstone width or the deflection of the tooth groove, and a high-precision honing grindstone can be processed.

That is, conventionally, since the outer peripheral portion of the grindstone is sandwiched between chucks for cutting, the grindstone having a small wall thickness is distorted in the radial direction, and the circularity of the outer diameter and the inner diameter is not averaged. Further, depending on the length of the chuck claw, only about half of the width of the grindstone was held, and an error occurred in the parallelism of the grindstone width and the deflection of the tooth space.

However, according to the present invention, the whetstone is passed through the insertion hole of the side surface through the mounting bolt and clamped and fixed to the support plate by the bolt, so that no radial distortion occurs and the outer diameter /
The circularity of the inner diameter is averaged, the parallelism of the width of the grindstone and the deflection of the tooth space are also averaged, and a high-precision honing grindstone can be processed.

(B) It is possible to perform cutting work on the inner and outer circumferences of the grindstone at the same time, which can greatly improve the working accuracy, workability and productivity of the honing grindstone.

That is, in the conventional cutting process of a honing grindstone, first, for example, the grindstone is chucked from the outer peripheral portion to cut the inner peripheral portion, then the grindstone is temporarily removed from the chuck, and then fixed from the inner peripheral portion to fix the outer peripheral surface. I was cutting. Due to the removal and reattachment work, there was a decrease in machining accuracy due to a replacement error, and there was also a problem in productivity.

However, according to the present invention, once the grindstone is once attached to the support plate as described above, the inner peripheral portion and the outer peripheral portion of the grindstone can be cut without being removed in the middle. Therefore, the processing accuracy of the honing grindstone can be improved, and the workability and productivity can be greatly improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a partially longitudinal front view showing a state in which a grindstone to be cut is positioned and temporarily fastened to a support plate, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. Is a partially longitudinal front view in a state where it is fully tightened and fixed, FIG. 4 is a plan view in which abrasive grains and the like are poured into a mold for forming a grindstone for cutting, and FIG. 5 is an AB in FIG. Fig. 6 is a sectional view taken along line C, Fig. 6 is a plan view of a grindstone formed by a mold, Fig. 7 is an enlarged vertical side view of a part of the positioning shown in Fig. 1, and Fig. 8 is positioning using a tightening ring FIG. 9 is an exploded perspective view of FIG. 8 when partially tightened, FIG. 9 is an exploded perspective view of an embodiment in which mounting bolts are projected on a support plate, and FIG. 11 is a conventional perspective view. It is a front view of a positioning and fixing means. Drawing symbol (1) …… Outer mold, (2) …… Inner mold, (3) …… Grinding stone material (4) …… Grinding stone (material), (5) …… Internal teeth, (6)…
… Side part (7) …… Bolt insertion hole, (8) …… Mounting bolt,
(9) …… Work spindle (10) …… Support plate, (11) …… Reference guide boss,
(12) …… Centering jig (13) …… Outer peripheral surface, (14) …… Ball, (15) …… Screwing hole (16) …… Boss hole, (17) …… Nut, (19 ) ...... Tightening ring

Claims (3)

[Claims] 1. Sintering a grindstone material (3) to form inner teeth (5) on the inner peripheral portion, and mounting bolt insertion holes (on the side surface (6) at equal intervals in the circumferential direction). The grindstones (4) having the respective 7) formed therein are inserted through the mounting bolts (8) into the mounting bolt insertion holes (7) of the side surface portion (6), and the work spindle (9) of the cutting machine.
Temporary tightening on the side surface of the support plate (10) at the tip, and the inner tooth portion (5) on the inner circumference of the grindstone (4) and the support plate (10)
Between the protruding reference guide boss (11) at the center of the side surface,
The centering jig (12) having a tapered outer peripheral surface (13) is engaged and pushed in while interposing the balls (14) in the inner tooth portion (5) at equal intervals, and then the mounting bolt (8) ) Is fully tightened to fix the grindstone (4) to the side surface of the support plate (10), the centering jig (12) is then removed, and the inner peripheral portion and outer peripheral surface of the grindstone (4) in this fixed state are A method of processing an internal gear type honing grindstone, which comprises cutting with a cutting machine so as to have predetermined inner and outer diameters. 2. A support plate (10) attached to the tip of a work spindle (9) of a cutting machine, and a centering jig (12), wherein the support plate (10) has a reference guide boss ( 11) is provided so as to project, and a screwing hole (8) near the outer periphery for a mounting bolt (8) engageable with a bolt insertion hole (7) formed in the side surface (6) of the grindstone (4). 15) is molded, and the centering jig (12) is provided with an inner tooth portion (5) on the inner periphery of the grindstone (4) and a reference guide boss (1) at the center of the side surface of the support plate (10).
1) The support plate (1
Boss hole (1) that can be fitted into the reference guide boss (11) of (0)
6) and the inner peripheral tooth portion (5) of the grindstone (4) on the outer peripheral portion, a tapered outer peripheral surface (13) capable of centering is formed by interposing a ball (14). A centering and fixing device used for a method of processing an internal gear type honing grindstone. 3. A support plate (10) mounted on the tip of a work spindle (9) of a cutting machine, and a centering jig (12). The support plate (10) has a reference guide boss ( 11), and a mounting bolt (8) that can engage a bolt insertion hole (7) formed in the side surface portion (6) of the grindstone (4) near the outer periphery, and is centered. The jig (12) includes an inner tooth portion (5) on the inner periphery of the grindstone (4) and a reference guide boss (1) at the center of the side surface of the support plate (10).
1) The support plate (1
Boss hole (1) that can be fitted into the reference guide boss (11) of (0)
6) and the inner peripheral tooth portion (5) of the grindstone (4) on the outer peripheral portion, a tapered outer peripheral surface (13) capable of centering is formed by interposing a ball (14). A centering and fixing device used for a method of processing an internal gear type honing grindstone.