JP2006212726A - Electro-deposited dressing gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electro-deposited dressing gear of long service life with little fall of electro-deposited abrasive grains of dedendums by reducing the difference between the electro-deposited layer thickness of the tips and electro-deposited layer thickness of the dedendums of the electro-deposited dressing gear whose outermost surface tooth profile shape after electro-deposited can be set to the same as a gear, and making the electro-deposited layer thickness of the dedendums deep to enhance abrasive grain holding force while enhancing the electro-deposited abrasive grain density of the dedendums. <P>SOLUTION: The electro-deposited dressing gears 5, 6, 7 are provided for dressing an internal tooth grinding wheel, which is not shown in the figure, for honing tooth flanks of a quenched external gear with an involute tooth profile. Tooth dedendums 52, 62, 72 of dressing gear bodies 50, 60, 70 are provided with dressing gear body dedendum cutouts 55, 65, 75 forming body dedendum flanks 56, 66, 76 having intersections with involute tooth flanks 51, 61, 71 and forming an included angle θk. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrodeposited dress gear in which a dressing gear body is electrodeposited with abrasive grains for dressing an internal grindstone for honing the tooth surface of a hardened external gear having an involute tooth profile.

Conventionally, hobbing or gear shaper machining is generally used to form gear tooth portions from the viewpoint of machining efficiency for external gears. At this stage, the teeth of the external gear are almost formed in the shape of the individual specifications and have a function as a gear. However, in gear applications, such as high-speed rotation specifications or high-load specifications, the meshing vibration of the gear pair Noise, pitching and durability are important issues, and gear tooth surfaces can be tailored smoothly and with high precision by shaving. However, this is only a measure to improve accuracy, and in order to give the gear a more important gear function, heat treatment is subsequently performed to increase the strength of the material itself. In the subsequent heat treatment process, due to the transformation of the material structure, slight distortion, bending, and deformation are caused, and the gear tooth accuracy is lowered by 1 to 2 (former JIS). The external gear that requires high gear accuracy that is required to restore the gear tooth accuracy after the heat treatment is subjected to refinishing by grinding or a gear honing method. As a tool used for conventional hard gear honing processing with good machining efficiency, for example, an internal grindstone 1 for directly machining a workpiece 10 (directly meshing with the workpiece 10) as described in FIG. Diamond dressing gear 3 that dresses the tooth surface 2 of the internal grinding wheel 1 and electrodeposits abrasive grains on the dress gear body (has almost the same dimensions and dimensions as the workpiece 10, and the mounting state is the same. For convenience, the electrodeposition dress gear 3 is shown in FIG. These details are disclosed in Patent Document 1.
JP 2002-361556 A

  Basically, an electrodeposition dress gear used for such conventional hard gear honing is designed and manufactured with the same specifications and shape as the gear to be processed. In other words, the meshing characteristics of the gear to be processed are given to the electrodeposition dressing gear, and the internal grinding stone 1 is dressed with the electrodeposition dressing gear, so that the meshing characteristics of the internal grinding wheel 1 and the gear match and the tooth surface of the gear is made by honing. Shape collapse can be kept to a minimum. As shown in FIG. 3A, the shape of the tooth root surface 32 of the tooth portion 9 of the dress gear 3 is a tooth root surface continuously and smoothly connected to the main involute tooth surface 31 as in the case of a normal gear. Designed and manufactured in 32 shapes. Dress gear 3 is a dresser for resin-type or ceramic-type internal grinding wheels, so diamond abrasive grains 35 with a diameter of 0.1 to 0.2 mm that are sized only on the tooth surface of dress gear body 30 made of steel are electrodeposited. It is fixed. FIG. 3E is an overall perspective view of one tooth of the electrodeposition dress gear of FIG. 3A, and FIG. 3F is a schematic sectional view of the electrodeposition dress gear main body 30 of FIG.

  As shown in FIG. 3 (b), the general procedure for producing an electrodeposited dress gear used in conventional hard gear honing is to temporarily fix diamond abrasive grains 35 to the tooth surfaces of the dress gear body 30 by electroplating 34. Next, as shown in FIG. 3C, the plating layer 36 is grown by chemical plating to ensure the abrasive gripping force. However, as a result, as shown in FIG. 3 (d), a difference occurs in the electrodeposition layer thickness from the tooth tip surface 37 to the tooth base surface 32 of the electrodeposition dress gear 3, and the electrodeposition outermost surface shape is parallel to the tooth surface shape of the main body. do not become. Specifically, the electrodeposition layer thickness 38 from the tooth tip surface 37 to the tooth root surface 32 of the electrodeposition dress gear 3 is finished thicker than the tooth tip electrodeposition layer thickness 39 compared to the tooth root electrodeposition layer thickness 39. The amount varies depending on the tooth specifications, but varies in the range of about 10 to 30 μm. Therefore, the conventional electrodeposition dress gear has the following technical problems. First, in order to set the outermost surface tooth profile after electrodeposition to be the same as that of the gear, the main body tooth surface tooth profile needs to be a corrected shape that allows for the difference amount in advance. The greater the difference, the more difficult the reproducibility of the outermost tooth profile after electrodeposition. Second, since the tooth electrodeposition layer thickness 39 is shallower than the tooth tip electrodeposition layer thickness 38, the holding power of the abrasive grains 35 is relatively weak, which causes early grain dropout during dressing. Cheap. In addition, since the distribution density of the electrodeposited abrasive grains becomes coarse, the burden on the abrasive grains is increased, and the abrasive grains are also dropped. Eventually it leads to a short life of the dress gear.

  An object of the present invention is to solve the technical problem of such a conventional electrodeposition dressing gear, the outermost surface tooth profile after electrodeposition can be set to the same as that of the gear, and the thickness of the electrodeposition electrodeposition layer and the tooth root of the electrodeposition dressing gear Reduces the amount of difference from the electrodeposition layer thickness, deepens the dentition electrodeposition layer thickness, increases the retention of abrasive grains, increases the dentition electrodeposition abrasive grain density, and reduces the dentition electrodeposition grain loss It is to provide an electrodeposition dressing gear.

  The inventor examined the technical problem of the electrodeposition dressing gear, and as a result, electrodeposition basically passes through two major steps of electroplating and chemical plating. Plating is unthinkable. Chemical plating only provides a filling effect. In electroplating, nickel ions are generated from the plating solution in the electrodeposition bath by energization, and the abrasive is temporarily fixed to the tooth surface of the dress gear body using the plating force. On the other hand, as shown in FIG. 3 (f), the tooth gear cross-sectional shape of the dress gear main body has a shape characteristic that the tooth width of the tooth portion of the dress gear main body 30 has a thin tooth tip surface 37 and a thick tooth base surface 32. The current density may be different. Naturally, it is presumed that the tooth tip surface 37 has a high current density and the tooth base surface 32 has a low current density, which is considered to be a difference in the amount of nickel ions fixed. Based on this consideration, the present invention was created in consideration of giving the tooth base surface 32 of the tooth portion of the dress gear main body 30 a shape capable of increasing the current density.

  For this reason, the present invention provides an electrodeposition dress gear for dressing an internal grinding wheel for honing the tooth surface of a hardened external gear having an involute tooth profile, and the main involute tooth surface of the main body at the tooth base of the dress gear main body. The above-mentioned problems have been solved by providing an electrodeposition dressing gear characterized in that a notch for forming a main body tooth root surface having an angle of intersection with each other is provided.

  In the present invention, since the notch that forms the main body tooth base surface that forms an angle with the main involute tooth surface of the main body is provided at the tooth base of the dress gear main body, the outermost tooth profile after electrodeposition Can be set to the same as the gear, and the difference between the electrodeposition electrode layer thickness and the electrodeposition electrodeposition layer thickness of the electrodeposition dress gear is reduced, the tooth electrodeposition layer thickness is increased and the abrasive retention force is increased. Further, the present invention provides a long-life electrodeposition dressing gear which increases the tooth root electrodeposition abrasive grain density and reduces the tooth root electrodeposition abrasive grain dropping.

  Preferably, it is desirable that an actual sandwich angle at the intersection with the involute tooth surface is 120 ° or less.

  The best mode for carrying out the present invention will be described with reference to FIG. FIG. 1 (a) is a half sectional view of an essential part of one tooth of an electrodeposited dress gear showing a first embodiment of the present invention, and FIG. 1 (b) is a second embodiment of the present invention different from FIG. The main part half sectional view of the 1 tooth | gear of the electrodeposition dress gear shown, (c) is the principal part half of the 1 tooth | gear of the electrodeposition dress gear which shows the 3rd Embodiment of this invention which is further different from (a), (b). Cross sections are shown respectively.

  The electrodeposition dressing gear according to the first embodiment of the present invention shown in FIG. 1 (a) is an electrodeposition for dressing an internal grindstone (not shown) for honing the tooth surface of a hardened external gear having an involute tooth profile (not shown). A circle formed by drilling so as to form a body tooth root surface 56 having an intersection angle 53 with the main involute tooth surface 51 of the main body 50 at the tooth root 52 of the dress gear body 50. A notch 55, which is a hole in the shape, was provided. The aim is to provide an intersection 53 at the root 52 of the dress gear body to increase the current density. The notch 55, which is a circular hole, is used in a shaving cutter 80 having a plurality of blade portions 82 provided with serrations 81 on the outer periphery, which is often used for raw finishing of a gear tooth surface having an involute tooth shape shown in FIG. Although it looks similar to the normal annular hole 85, the annular hole 85 of the shaving cutter 80 prevents interference of a cutting tool cutting edge (not shown) when machining the serration 81 on the blade surface 83 of the blade part 82. It is a relief hole 85. As shown in the overall perspective view of one tooth in FIG. 3 (e), there is no serration on the blade surface, and there is no extra machining cost for the electrodeposition dressing gear main body 50 that does not require a relief hole for preventing interference on the serration tool cutting edge. There is no incentive to provide an annular watermark hole that requires.

In order to obtain an effect of increasing the current density by providing the intersection 53 in the dress gear main body tooth root 52, the included angle θk formed by the main tooth root surface 56 of the dress gear main body 50 with respect to the main involute tooth surface 51 at the intersection 53 is θk < I also found that it should be 120 °.
Therefore, the tooth root shape of the main body tooth root surface 56 does not necessarily have to be a circular shape by drilling, and the electrodeposition dress gear 6 of the second embodiment of the present invention shown in FIG. A notch 75 may be provided so that the tooth root 72 has an intersection 73 with the main involute tooth surface 71 of the main body 70 and forms a flat main tooth surface 76 forming the included angle θk. Furthermore, like the electrodeposition dressing gear 7 of the third embodiment of the present invention shown in FIG. 2C, the tooth root 62 of the dressing gear main body 60 has an intersection 63 with the main involute tooth surface 61 of the main body 60. In addition, a notch 65 may be provided so as to form a main body tooth surface 66 having an included angle θk of approximately 90 °.

A dress gear main body provided with a circular hole 55 of φ4.0 mm by drilling in the electrodeposition dress gear main body of the first embodiment of the present invention shown in FIG. For the dress gear main body not provided with such a circular hole as shown in FIG. 3 (a), an electrodeposition dressing gear is prepared by electrodepositing an electrodeposition plating layer by actual electroplating and chemical plating for each abrasive grain, Embedding percentage of each tooth base of electrodeposition dress gear,
Table 2 shows the results of comparison by calculating the embedment ratio% of each tooth base = plated layer thickness / abrasive grain height × 100. The electrodeposition electrodeposition layer thickness of the electrodeposition dressing gear according to the first embodiment of the present invention provided with a notch that is a circular hole of φ4.0 mm approaches the tooth tip electrodeposition layer thickness, The electrodeposition layer thickness was increased to dramatically increase the abrasive grain retention and the root electrodeposition abrasive grain density was also increased. As a result, a long-life electrodeposition dressing gear with little loss of tooth root electrodeposition abrasive grains was obtained. The greatest effect of the present invention is that the root embedding ratio% is increased, the abrasive gripping force is increased, the short-life phenomenon due to the falling off of the abrasive grains as in the conventional electrodeposition dress gear is drastically reduced, and the electrodeposition outermost surface Since the parallelism error between the tooth profile and the main body tooth profile has been reduced, the amount of adjustment of the main body tooth profile of the electrodeposition dress gear can be reduced, and tooth profile grinding has become easier.

(A) is a half sectional view of an essential part of one tooth of an electrodeposited dress gear showing the first embodiment of the present invention, and (b) is an electric diagram showing a second embodiment of the present invention different from (a). The main part half sectional view of one tooth of the dressing gear, (c) is a half sectional view of the main part of one tooth of the electrodeposition dress gear showing the third embodiment of the present invention which is further different from (a) and (b). , Respectively. Fig. 2 shows the machining status of workpieces, internal grinding wheels and electrodeless dressing gears in conventional hard gear honing, (a) is a cross-sectional view seen from the direction perpendicular to the axis, and (b) is a description of the right half part seen from the axis direction. FIG. (A) is a schematic cross-sectional view of one tooth of an electrodeposition dress gear in conventional hard gear honing, (b) is an enlarged explanatory view of a main part for temporarily fixing diamond abrasive grains to the tooth surface of the dress gear body by electroplating, c) is an enlarged explanatory view of the main part where the diamond abrasive grains are temporarily fixed by electroplating in (b) and the plating layer is grown by chemical plating, and (d) is the plating layer grown by chemical plating in (c). 1 is an enlarged schematic cross-sectional view of the main part of one half of the teeth after the first, (e) is an overall perspective view of one tooth of the electrodeposition dress gear of (a), and (f) is a schematic cross section of the electrodeposition dress gear main body of (a). The figure is shown. The whole perspective view of 1 tooth | gear of the shaving cutter which has a some blade part by which the serration was provided in the outer periphery often used for the raw finishing of the gear tooth surface which has an involute tooth profile.

Explanation of symbols

5, 6, 7: Electroplated dress gear
50, 60, 70: Dress gear body
51, 61, 71: The main involute tooth surface of the dress gear body
52, 62, 72: Dress gear body teeth
53, 63, 73: Intersection
55, 65, 75: Dress gear body tooth notch
56, 66, 76: Dress gear body tooth root surface θk: Narrow angle

Claims (2)

  In an electrodeposition dressing gear for dressing an internal grinding wheel that finishes the tooth surface of a hardened external gear having an involute tooth profile, the tooth angle of the dress gear body has an intersection with the main involute tooth surface of the body, and a sandwich angle An electrodeposition dressing gear provided with a notch for forming a tooth base surface of the body.   2. The electrodeposition dress gear according to claim 1, wherein an actual sandwich angle at an intersection with the involute tooth surface is 120 ° or less.

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