JPH02237719A - Internal gear type honing grindstone, processing for grindstone, and alignment fixation device used therefor - Google Patents

Abstract

PURPOSE:To make workable an internal gear type honing grindstone having high accuracy and sharply increase processing accuracy, operability, and productivity by forming fitting bolt inserting hole at an equal interval state in a circumferential direction to the side surface part of a grindstone. CONSTITUTION:A fitting bolt 8, inserted in the bolt insertion hole 7 of a grindstone 4, is temporary clamped to a support plate 10 side surface in which the grindstone 4 is provided on the tip part of the work spindle 9 of a lathe which is a cutting machine. At that time, when a bolt threadly engagement hole 15 is formed to a support plate 10, it is enough that a fitting bolt 8 is inserted into the hole 7 of the grindstone 4 and the bolt 8 is threadedly inserted into the hole 15 of the plate 10 to be temporary clamped. And the bolt 8 temporary clamped is normally clamped to be fixed to the plate 10 side surface in the condition where the alignment of the grindstone 4 is made. After that, the inner peripheral part and outer peripheral surface of the grindstone 4 in a fixed condition are subjected to cutting work to have given inner and outer diameters.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Field of Industrial Application] The present invention relates to an internal gear type honing grindstone, a method for processing the grindstone, and a centering fixing device used therein.

[Conventional technology]

Gear honing wheels are used for honing gears (gear honing), that is, removing dents and heat treatment distortion after gear cutting, reducing tooth groove runout and machining errors, improving the accuracy of tooth surfaces, tooth profiles, and leads, and the like. It is used when finishing gears to reduce the noise caused by the process.

Among the above-mentioned gear honing stones, an internal gear type honing stone, a processing method for the honing stone, and a centering fixing device used therefor have conventionally been generally as follows.

First, when forming an internal gear type honing stone, the grinding wheel material (
The grindstone material here refers to abrasive grains, binder hardeners, additives, and the like. The same applies hereafter) is poured and sintered to form a short cylindrical whetstone with internal teeth (a) on the inner periphery.

Next, as shown in FIG. 11, the internal gear type honing stone is machined by centering the outer diameter and inner diameter from the outer periphery in front of the honing stone using the chuck (21) at the tip of the work spindle (6) of the lathe. While holding it in place, cut the inner periphery to the specified inner diameter. After that, chuck the grindstone (a) αi
Once removed, the inner circumferential side is fixed, and the outer circumferential surface is cut to a predetermined outer diameter. Further, the inner circumferential surface may be cut after the outer circumferential surface is cut.

[Problem to be solved by the invention]

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

i) Since the outer periphery of the grindstone is held by a chuck, if the grindstone is thin, distortion will occur in the radial direction and the roundness of the outer diameter and inner diameter will not be equalized.

Also, depending on the length of the chuck jaw, only about half of the width of the grinding wheel is supported, and as mentioned above, the roundness of the outer and inner diameters is not evened out, and the parallelism of the width of the grinding wheel and the deviation of the tooth grooves are affected. An error also occurred.

ii) During cutting, for example, after cutting the inner periphery of the whetstone, the whetstone is removed from the chuck and then fixed from the inner periphery to cut the outer periphery, which requires removal and reinstallation. be. As a result, replacement errors occurred, and the machining accuracy of the honing stone was not necessarily good.

The present invention aims to solve the problems of the conventional internal gear type honing grindstone, the processing method of the grindstone, and the centering fixing device used therein. In other words, the object of the present invention is to eliminate distortion in the radial direction when cutting an internal gear type honing stone, and to even out the roundness of the outer diameter and inner diameter, and to reduce the parallelism of the width of the grindstone and the deviation of the tooth space. In addition, cutting of the inner and outer periphery of the grindstone can be performed without removing and reinstalling the grindstone midway through, eliminating replacement errors and greatly improving machining accuracy, workability, and productivity. It is an object of the present invention to provide an internal gear type honing grindstone, a method for processing the grindstone, and a centering fixing device used therein, which can improve the performance of the honing stone.

Structure of the Invention [Means for Solving the Problems] a) First, the internal gear type honing stone of the present invention has a structure in which a honing stone is formed between a short cylindrical outer mold (1) and an inner mold (2) corresponding to a mask gear. An internal gear type honing whetstone (
In 4), the side surface (6) of the grindstone (4) is provided with holes (7) for inserting the mounting bolts i at equal intervals in the circumferential direction. b) In addition, the method for processing the inner cast wheel type honing whetstone of the present invention includes sintering the whetstone material (3), forming an internal tooth part (5) on the inner peripheral part, and forming an internal tooth part (5) on the side part (6) in the circumferential direction. The grindstone (4), which has mounting bolt holes (7) formed at equal intervals, is inserted into the mounting bolt holes (7) on the side surface (6) to perform cutting. The support plate at the tip of the work spindle (9) of the machine is temporarily tightened on the Q side surface, and the internal gear (5) on the inner periphery of the grindstone (4) and the reference guide protruding from the center of the support plate 0 @ side surface are attached. Between the boss (10)), there is a centering jig 0:! whose outer peripheral surface 03 is tapered. Engage and push J into the center by interposing the balls α in the internal teeth part (5) at equal intervals, then fully tighten the mounting bolts (8), and attach the grinding wheel (
4) is fixed to the side surface of the support plate 0, then the centering jig (B) is removed, and the inner and outer circumferential surfaces of the fixed whetstone (4) are cut to the specified inner and outer diameters using a cutting machine. It is machined to make it look like this.

C) Furthermore, the centering fixing device used in the internal gear type honing grindstone processing method of the present invention consists of a support plate α1 attached to the tip of the work spindle (9) of the cutting machine and a centering jig (roller). , the above-mentioned support plate} Q[I] has a reference guide boss (11) protruding from the center, and a bolt insertion hole (7) formed in the side surface (6) of the grindstone (4) near the outer periphery. ) to form a threading hole OS for the mounting bolt (8) that can be engaged with the centering jig 0;! 1 is provided with the reference guide boss of the support plate (II) in the center so that it can be held between the internal teeth (5) on the inner periphery of the grindstone (4) and the reference guide boss αυ in the center of the side surface of the support plate αl. A tapered outer circumferential surface that can be centered by interposing a ball a between the boss hole Q[il that can be fitted to 0υ and the grindstone (4) on the circumference and the internal teeth (5) on the inner circumference. It is formed by forming α-water.

d) Another centering fixing device used in the method for processing an inner cast wheel type honing stone of the present invention is composed of a support plate α1 attached to the tip of a work spindle (9) of a cutting machine and a centering jig 03. , the support plate (10) has a reference guide boss aυ protruding from the center, and a bolt insertion hole (7) formed in the side surface (6) of the grindstone (4) near the outer periphery. A possible mounting bolt (81) is installed protrudingly, and the centering jig is connected between the internal teeth (5) on the inner periphery of the grinding wheel (4) and the reference guide boss αυ in the center of the side surface of the support plate. a boss hole aυ that can be fitted to the reference guide boss αD of the support plate (10) in the central part, and an internal tooth part (5) on the inner periphery of the grindstone (4) in the row periphery; A tapered outer peripheral surface α that can be centered is formed with a ball interposed therebetween.

[For production]

The internal gear type honing grindstone of the present invention, the processing method of the grindstone, and the centering fixing device used therein are as follows.

First, as shown in Fig. 4, a grindstone material (3) is placed between a short cylindrical outer mold (1) and an inner mold (2) corresponding to a master gear.
It is the same as the conventional method in that it is poured and sintered into a short cylindrical shape having internal teeth (5) on the inner periphery. However, the whetstone《4
The difference is that bolt insertion holes (7) are formed at equal intervals in the circumferential direction on the side surface (6) of the (see Fig. G).

Next, attach the above-mentioned grindstone (4) to the side surface of a support plate' (10) provided at the tip of the work spindle (9) of a lathe, which is a cutting machine, and attach a bolt to the bolt insertion hole (7) of the grindstone (4). (8) and temporarily tighten. At that time, if the support plate α Samurai has a hole α field for bolt threading, the grinding wheel (
Insert the mounting bolt (8) into the bolt insertion hole {7) in 4), screw the bolt (8) into the bolt threading hole α9 of the support plate α, and temporarily tighten it ( (See Figure 1)
．． In addition, in the case where the mounting bolt (8) is provided protruding from the side surface of the support plate (10) (see Figure IO), the grindstone (4) is inserted into the mounting bolt (8) through the bolt insertion hole (7). , and temporarily tighten it to the support plate Q (I).

Next, a centering jig (b) is placed inside the grindstone (4) between the inner teeth (5) of the former (4) and the tapered outer peripheral surface α of the latter (b) in the circumferential direction. Balls α~ are interposed at equal intervals, and the boss hole afi of the centering jig @ is fitted and engaged with the reference guide boss αD of the support plate (10). Due to the engagement of the centering jig, the tapered outer circumferential surface α presses the internal tooth part (5) via the ball.
The grindstone (4) is aligned and centered (see Figure 1).

In addition, in order to engage this centering jig (b) into the grindstone (4), there is a male threaded portion (10) formed on the reference guide boss αυ! If a tightening ring α having a female threaded hole (end) that can be fitted to J is used and the ring is fitted (see FIGS. 8 and 9), the workability of the engagement will be improved.

With the centering done as described above, the temporarily tightened mounting bolts (8) are fully tightened to fix the grindstone (4) to the side of the support plate (10), and the centering jig (automatic )・Take out the ball (b).

Thereafter, the fixed grindstone (4) is machined using a cutting machine, such as a general-purpose lathe, to cut the inner circumference and outer circumferential surface to predetermined inner and outer diameters (see Fig. 3). At this time,
There is no need to remove the grindstone 《4》 in the middle as in the conventional case.

〔Example〕

To form the whetstone, the outer mold (1) and the inner mold (2) are placed on a rotary table (22), and while rotating, the whetstone material is poured, molded, heated, and sintered.

The above-mentioned grindstone material may be a mixture of aluminum oxide or silicon carbide as the abrasive grains, liquid epoxy resin as the binder (hardening agent), and calcium carbonate as the additive.

In addition, to form the mounting bolt insertion holes (7), before pouring the grindstone material, a plurality of cylindrical members are set up at equal intervals in the circumferential direction between the outer mold (1) and the inner mold (2). You can set it in place and remove it after forming the grindstone. However, the invention is not limited thereto, and the grinding wheel may be sintered and then bored with a drill or the like. Although the number of bolt insertion holes (7) is four in the illustrated example, it is not limited to this and may be increased appropriately depending on the size of the grindstone (4) and the like.

The attachment of the grindstone (4) to the support plate (10) is carried out in the first
In Figures 2, 3, 8, and 9, the mounting bolt (8) is inserted into the bolt insertion hole (7) of the grinding wheel {4}, and the support plate (10) is inserted. The bolt is screwed into the hole α and tightened. However, as shown in Fig. 10, a mounting bolt (8) is provided protruding from the support plate α, and the bolt {
8} may be fitted with the bolt insertion hole (7) of the grindstone (4) and tightened with a nut αη.

In addition, a large number of holes α for bolt threading are formed in the support plate (10), and appropriate holes for threading are formed in accordance with the bolt insertion holes (7) whose positions differ depending on the size of the grindstone (4), etc. It is also possible to select and use the hole (F).

Note that the centering jig (self) is engaged into the grindstone (4) by pushing it in in Figures 1, 2, and 3.
However, as shown in Figs. 8 and 9, a male threaded part α is formed on the reference guide boss (6), and a female threaded hole (a tightening ring 0 with a 2 o'clock position) that can be screwed therein is prepared. The tightening ring (10) may be screwed onto the centering jig from the rear and tightened.

Effects of the Invention As is clear from the foregoing, the internal gear type honing grindstone, the method for processing the grindstone, and the centering fixing device used therein according to the present invention have the following effects.

b) The roundness of the outer diameter and inner diameter of the whetstone are averaged, and there are no errors in the parallelism of the whetstone width or the runout of the tooth grooves, making it possible to process a high-precision honing whetstone.

In other words, conventionally, the outer periphery of the grinding wheel is supported by a chuck.
When the grindstone was thin, distortion occurred in the radial direction, and the roundness of the outer and inner diameters did not become even. Also, depending on the length of the chuck jaw, it will only support about half the width of the grindstone.
Errors also occurred in the parallelism of the grinding wheel width and the deviation of the tooth groove.

However, according to the present invention, the grinding wheel is passed through the mounting bolt through the insertion hole in the side surface and is tightened and fixed to the support plate using the bolt, so that distortion does not occur in the radial direction, and the outer diameter
The roundness of the inner diameter is averaged, and the parallelism of the width of the whetstone and the runout of the tooth grooves are also averaged, making it possible to process a high-precision honing whetstone.

Mouth) The inner and outer circumferential parts of the honing stone can be cut at the same time, greatly improving the machining accuracy, workability, and productivity of the honing stone.

In other words, in the conventional cutting process using a honing whetstone, the whetstone is first chucked from the outer periphery and the inner periphery is cut, then the whetstone is removed from the chuck, and then it is fixed from the inner periphery and the outer periphery is cut. It was cutting. Due to the removal and reinstallation work, there was a reduction in machining accuracy due to replacement errors, and there was also a problem in productivity.

However, in the present invention, as described above, a mounting bolt is passed through the insertion hole in the side surface of the grindstone, and the bolt (nuff I-) is used to tighten and fix the grindstone to the support plate. Therefore, once installed, the inner and outer circumferential parts of the grindstone can be cut without removing it midway. Therefore, it is possible to improve the processing accuracy of honing stone processing, and to significantly improve workability and productivity.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a partially longitudinal front view in a state where it has been positioned and temporarily tightened, Fig. 2 is an exploded perspective view of Fig. 1, and Fig. 3 is a state in which it has been fully tightened and fixed. Fig. 4 is a plan view of the state in which abrasive grains, etc. are poured into the mold, Fig. 5
The figures are a sectional view taken along the line A-B-C of Fig. 4, Fig. 6 is a plan view of the formed grindstone, Fig. 7 is an enlarged longitudinal sectional side view of a portion of the positioning shown in Fig. 1, and Fig. 8. 9 is an exploded perspective view of FIG. 8, and FIG. 10 is an exploded perspective view of an embodiment in which mounting bolts are protruded from the support plate. , FIG. 11 is a front view of a conventional positioning and fixing means. Drawing code: (1) - External mold (3) - Grinding wheel material (5) - Internal teeth (7) - Bolt insertion hole (9) - Work spindle αυ - Reference guide boss a3 - Outer circumferential surface (2) - Inner Mold (4) Whetstone (6) Side part (8) 1 Mounting bolt α 1 Support plate 1 Centering jig a Lee ball

Claims (1)

[Claims] [1] A grindstone material (3) is poured between a short cylindrical outer mold (1) and an inner mold (2) corresponding to a master gear and sintered to form the inner periphery. In an internal gear type honing whetstone (4) formed with internal teeth (5), mounting bolt insertion holes (7) are provided at equal intervals in the circumferential direction on a side surface (6) of the whetstone (4). ) An internal gear-shaped honing stone. [2] Claim 1, wherein the grinding wheel material (3) uses aluminum oxide or silicon carbide for the abrasive grains, a thermosetting liquid organic substance for the binder, and an inorganic substance for the additive.
Internal gear type honing stone described in . [3] The grinding wheel material (3) is sintered to form internal teeth (5
), the side part (6) has a grindstone (4) with mounting bolt holes (7) formed at equal intervals in the circumferential direction, and the side part (6) has mounting bolt holes (7). 7) Mounting bolt (8)
, and temporarily tighten it to the side surface of the support plate (10) at the tip of the work spindle (9) of the cutting machine.
The outer circumferential surface (
13) connects the tapered centering jig (2) to the ball (1).
4) are interposed in the internal teeth part (5) at equal intervals, engage and push them in for centering, then fully tighten the mounting bolts (8), and attach the grindstone (4).
) is fixed to the side of the support plate (10), then the centering jig (12) is removed, and the inner and outer circumferential surfaces of the fixed grindstone (4) are cut to the specified inner and outer diameters using a cutting machine. A method for processing an internal gear type honing stone, which is characterized by cutting it so that it becomes . [4] Consists of a support plate (10) attached to the tip of the work spindle (9) of a cutting machine and a centering jig (12), and the support plate (10) has a reference guide boss (11) in the center. At the same time, a screw hole (15) for a mounting bolt (8) that can be engaged with a bolt insertion hole (7) formed in the side surface (6) of the grindstone (4) is provided near the outer periphery.
The centering jig (12) engages between the internal teeth (5) on the inner periphery of the grindstone (4) and the reference guide boss a (11) at the center of the side surface of the support plate (10). Possibly, a boss hole (16) that can fit into the reference guide boss (11) of the support plate (10) is provided in the center, and a hole (16) for a boss that can fit into the reference guide boss (11) of the support plate (10) is provided in the outer periphery, and a gap between the internal teeth (5) on the inner periphery of the grindstone (4) and A centering fixing device used in a method for processing an internal gear type honing stone, characterized in that a tapered outer circumferential surface (13) capable of centering is formed with a ball (14) interposed therebetween. [5] Consisting of a support plate (10) attached to the tip of the work spindle (9) of a cutting machine and a centering jig (12), the support plate (10) has a reference guide boss (11) in the center. At the same time, a mounting bolt (8) that can fit a bolt insertion hole (7) formed in the side surface (6) of the grinding wheel (4) is provided protruding near the outer periphery, and a centering jig is provided. (12) is the internal tooth part (5) on the inner periphery of the whetstone (4)
and a reference guide boss (11) in the center of the side surface of the support plate (10), and a boss hole in the center that can fit into the reference guide boss (11) of the support plate (10). (16), a grindstone (4) on the outer periphery, and an internal toothed part (5) on the inner periphery.
), a tapered outer circumferential surface (13) that can be centered with a ball (14) interposed therebetween is formed.
A centering fixing device used in the processing method of internal gear honing wheels.