JPS61249228A - Spline working for propulsion device - Google Patents

Abstract

PURPOSE:To improve the working efficiency by simultaneously working a spline inside diameter part and the spline shape part onto the prepared hole for spline and carrying out the working for the main-shaft fitting part onto the boss part, having the spline inside diameter part as standard. CONSTITUTION:A prepared hole 13 for spline is worked onto a boss part 2 through broach work. Then, the top edge of a broach cutter 11 is fixed onto a plaped 14 as the broaching machine driving part. Then, the plaped 14 is driven at a prescribed cutting speed, and the spline inside diameter B and the spline shape are continuously worked. Then, the spline inside diameter B of a boss part 2 is installed onto the collet member 23 of an installation tool 21 for working the main-shaft fitting part. At this time, the boss part 2 is in the centered state, setting the spline inside diameter B positive. In this state, the seal part 2a as the main-shaft fitting part is turning-worked.

Description

[Detailed description of the invention] 〈Industrial use distribution〉 The present invention relates to a spline processing method for a propulsion device.

<Conventional technology> When propelling a ship, etc., the propulsion 41 shown in Figures 4 and 5 is used.
(propeller) is used. This propulsion device 1 has a large number of blades 3 attached to a boss portion 2, and the boss portion 2 is attached to a main shaft 4 to which driving force is transmitted. This propulsion 111 is the main shaft 4
High precision concentricity is required between the spline portion (power transmission portion) and the spline portion (power transmission portion) 5. Conventionally, such spline processing of the propulsion device 1 has been carried out in the following steps. (6th, 7th.
(See Figure 8) (1) Perform rough machining of the seal portion 2a on the pre-machined boss portion 2 of the spline portion 5. (The diameter of the rough-machined surface at this time is assumed to be D.) Finish machining of the inner diameter B of the spline portion 5 is performed based on the diameter of the rough-machined surface of the seal portion 2a. At this time, it is assumed that the concentricity between the diameter of the rough-machined surface of the seal portion 2a and the inner diameter B of the spline portion 5 is a.

(2) Processing of spline shape A spline shape is processed using a broaching machine. The machining fixture 6 is fixed to the rough-machined surface of the seal portion 2a of the boss portion 2, and the spline shape of the spline portion 5 is machined using the broach cutter 7. At this time, it is assumed that the concentricity between the boss portion 2 and the processing fixture 6 is b1, and the concentricity between the processing fixture 6 and the broach cutter 7 is C.

(3) Finish turning of the seal portion 2a Finish turning is performed on the rough-machined surface of the seal portion 2a based on the inner diameter B of the spline portion 5. (The diameter of the finished surface at this time is assumed to be A.) At this time, it is assumed that the concentricity between the inner diameter B of the spline portion 5 and the diameter A of the finished surface of the seal portion 2a is d.

Conventionally, in order to ensure a certain degree of concentricity between the main shaft 4 and the spline part 5, the seal part 2a and the spline part 5 are processed into spline shapes in steps (1) to (3). There is.

<Problem that the invention seeks to solve> However, the processing method described above has the following drawbacks.

■ High precision concentricity cannot be ensured. Letting the required concentricity be X, the following equation must be satisfied.

X≧a + b + c + d For example, if X thousand 0.01 Sonoho, even if turning is performed at a#O2dmisaki0, it is impossible to suppress b and C within 0.01-1. be.

(2) The concentricity between the inner diameter B of the spline portion 5 and the spline effective diameter g is b+c (see FIG. 8), and the concentricity cannot be corrected in a subsequent process. (It is impossible to measure the concentricity of the spline effective diameter g) Due to reasons ① and ②, the concentricity that can be processed is 0.04 am or more, and if you are trying to keep it within 0.05 am, the above-mentioned (1) ~ In each step (3), a lot of time and effort was required for centering work.

The present invention has been made in view of the above-mentioned circumstances, and provides a spline processing method that can easily process the spindle fitting portion and the spline portion with high concentricity, thereby ensuring highly accurate concentricity between the spindle and the spline portion. The purpose is to improve the efficiency of spline processing.

Means for Solving the Problems> The gist of the present invention to achieve the object B is to drill a pilot hole for a spline in the power transmission section of the boss portion of the propulsion device, and to guide the pilot hole for the spline. The spline inner diameter part and the spline shape part were simultaneously machined into the spline prepared hole using a broach cutter that can simultaneously process the spline inner diameter part and the spline shape part in the spline prepared hole, and the spline inner diameter part and the spline shape part were processed at the same time by the broach cutter. The invention resides in a spline machining method for a propulsion device, characterized in that a main shaft fitting portion is machined in the boss portion with reference to an inner diameter portion of the spline.

Operation> The spline inner diameter portion and the spline shape portion are formed using a saw cutter which simultaneously processes the spline inner diameter portion and the spline shape portion using the spline pilot hole drilled in advance as a guide. Thereafter, the spindle fitting portion is turned using the processed spline inner diameter portion as a reference. Therefore, no centering work is required for machining the spline portion of the boss portion, and the spline portion and the main shaft fitting portion can be machined with high precision concentricity.

Embodiment Example An embodiment of the present invention is shown in Fig. 1 showing the shape of a broach cutter, Fig. 2 illustrating processing of the spline part, and Fig. 2 showing the state in which the fixture for processing the spindle fitting part is attached to the boss part. This will be explained based on FIG. Regarding the propulsion device, see Figures 4 to 8.
Since it is the same as that shown in the figure, the same reference numerals are given and redundant explanation will be omitted.

The four-piece cutter 11 consists of a guide part 12 guided by the spline prepared hole of the boss part 2, an inner diameter blade i for machining the inner diameter B of the spline part 5, and a spline-shaped blade j for machining the spline shape. It is configured. The main shaft fitting part machining fixture 21 includes a fixture body 22 and a collet member 23 whose turning center is determined by the inner diameter B of the spline part 5.
It is composed of.

Next, the spline processing process for the boss portion 2 will be explained.

(a) Preparatory hole machining for spline A prepared hole 13 for spline is formed in the boss portion 2 by broaching. This spline pilot hole 13 serves as a guide for the broach cutter 1°1.

(a) Spline processing (see Fig. 2) The guide portion 12 of the broach cutter 11 is inserted into the spline pilot hole 13 of the boss 2, and the tip of the broach cutter 11 is fixed to the plastic bed 14, which is the broaching disk drive portion. Next, the plastic ped 14 is driven at a predetermined cutting speed (Fig. 2(a)
(1) Pull the upper and lower plastic peds 14) Continuously process the spline inner diameter B and spline shape fa. At this time, the concentricity between the inner diameter blade i and the spline-shaped blade j of the broach cutter 11 is assumed to be X.

(1) Turning finish processing of seal portion 2a (see Fig. 3) Boss portion 2 is attached to collet member 23 of spindle fitting portion machining fixture 21.
Install spline inner diameter B. At this time, the boss portion 2 is centered with the spline inner diameter B being positive. In this state, turning is performed on the seal portion 2a, which is the main shaft fitting portion. At this time, the spline inner diameter B and the seal portion 2a
Let y be the concentricity with the inner diameter A.

By splining the propeller 1 in this way, the concentricity
becomes x+y. Since X is the concentricity of the broach cutter 11, it can be set to 1.0, so that x=y. y can be set to 0.01 mm or less since the spindle fitting part machining fixture 21 is used to perform centering with the spline inner diameter B being positive. Therefore, by performing the spline processing using the method described above, the seal portion 2a and the spline processing portion 5 are
This makes it possible to reduce the concentricity to 0.01M or less.

<Effects of the Invention> The spline machining method for a propulsion device of the present invention can easily machine the main shaft fitting portion and the spline portion of the boss portion with high efficiency (high concentricity). It is possible to ensure a high level of concentricity and to improve the efficiency of spline processing.

[Brief explanation of drawings]

FIG. 1(a) is a side view of a broach cutter that is processed by the method of the present invention, FIG. 1(b) is a sectional view taken along line E-E in FIG. 1(a), and FIG. 1(0) is Fig. 1(a) is a cross-sectional view taken along the line FF, Fig. 2(a) is a conceptual diagram explaining the machining of the spline part, and Fig. 2(b) is a cross-sectional view taken along the line ■-■ in al. 3 is a sectional side view of the main shaft fitting part processing fixture attached to the boss part, FIG. 4(a) is a front view showing the external appearance of the propeller, and FIG. 4(a) is a sectional view taken along the line ■-■, FIG. 5(a) is a cross-sectional side view showing the internal structure of the thruster, and FIG. View, 6th
The figure is a conceptual diagram explaining the processing of spline parts using the conventional method.
FIG. 7 is a sectional view of the boss portion, and FIG. 8 is a conceptual diagram showing the effective diameter of the spline shape. In the drawing, 1 is a propulsion device, 2 is a boss part, 2a is a seal part, 3 is a wing, 4 is a main shaft, 5 is a spline part, 11 is a broach cutter, 12 is a guide part, 13 is a pilot hole for spline, A is a seal B is the inner diameter of the spline portion, fa is the spline shape, i is the inner diameter blade, and j is the spline shape blade.

Claims (1)

[Claims] A pilot hole for a spline is drilled in the power transmission section of the boss portion of the propulsion device, and a broach cutter that can simultaneously process the inner diameter portion of the spline and the spline shape portion into the pilot hole for the spline is used as a guide to cut the pilot hole for the spline. A propulsion device characterized in that a spline inner diameter portion and a spline shaped portion are simultaneously machined in a spline pilot hole, and a main shaft fitting portion is machined in the boss portion based on the spline inner diameter portion machined by the broach cutter. spline processing method.