JPS59115113A - Blind groove machining device - Google Patents

Abstract

PURPOSE:To effect desired blind groove machining through individual simple movement, by a method wherein a tool and a sleeve member, being an object to be machined, are associated with each other and periodically moved. CONSTITUTION:With a main shaft 5 turned, a ram 4 and a cutting tool 3 supported by the ram are reciprocated and pass through a hole 1a in a sleeve member 1 in its longitudinal direction. By means of a cam 9, slide base 11 and the member 1 are moved rectilinearly in directions of X-X and Y-Y, at given timing enabling the cutting tool 3 to cut, as shown in (a'), the peripheral surface of the hole 1a in the member 1. Thereafter, a base 14 is intermittently fed to cut it as shown in b, b' and c, c' to form a blind groove 1b on the inner surface of the sleeve member 1 in a longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blind groove machining device for forming a longitudinal blind groove in a hole in a sleeve member.

When forming a longitudinal groove with both ends closed, that is, a blind groove 1b, in the hole of the sleeve member 1 as shown in FIG. This objective is achieved by broaching the inside of the hole, providing cylindrical precision counterbore holes at both ends of the groove, and press-fitting bushings into the holes to close both ends of the groove to form a blind groove.

This conventional method has drawbacks such as requiring a plurality of processing equipment, requiring a large number of parts, and increasing the number of processing steps, resulting in an increase in processing costs.

There is also a method disclosed in Japanese Patent Application Laid-Open No. 52-84590, but this method involves fixing a sleeve and machining the cut using only the movement of the tool, so the movement of the tool is complicated and the tool In order to make a complicated motion in the tool, a complicated combination of many mechanisms such as a cam mechanism, a link mechanism, a crank mechanism, etc. is required, which not only makes the device extremely expensive, but also requires a complicated combination with the inner diameter of the sleeve in order to make the tool make a complicated motion. It has many drawbacks, such as the need to avoid interference, which results in less freedom in the shape of the tool and insufficient strength, and the cost of the tool is high.

The present invention provides an apparatus that can easily perform desired blind groove machining with extremely simple individual movements by periodically moving both a tool and a sleeve member, which is a workpiece member. The present invention will be described below with reference to embodiments shown in the accompanying drawings.

In FIG. 1, a sleeve member 1 is a workpiece, and the sleeve member 1 is held by a holder 2 such as a collet or chuck fixed on an index table 13. As shown in FIG.

The index table 13 is mounted on a base 14 in a direction X perpendicular to the stroke direction Y-Y of a cutting tool 30, which will be described later.
It is mounted on a slide base 11 that is supported so as to be slidable in -X.

A cam 9 is rotatably mounted on the base 14, a pressing means such as a compression spring 12 is provided on one side of the slide base 11, and a follower such as a roller 0 is mounted on the other side. The roller o comes into pressure contact with the cam 9 by the pressure of the compression spring 12, and the slide base 11 reciprocates in the XX direction as the cam 90 rotates.

Reference numeral 5 denotes a main shaft which is rotated by a drive source such as a motor (not shown) and a deceleration mechanism, and the 50 rotations of the main shaft cause the ram 4 to move up and down via a crank mechanism, a link mechanism (not shown), etc.
The cutting tool 3 attached to the ram 4 is moved in the vertical direction, that is, in the Y-
It is designed to reciprocate in the Y direction.

Further, the rotation of the main shaft 5 rotates the cam 9 via the sprockets 6, 7 and the chain 8, etc., so that the slide base 11 is reciprocated in the left-right direction, that is, on the X-X line, as described above. The stroke of the vertical movement of the cutting tool 3 and the stroke of the horizontal movement of the slide base 11 by the cam 9 are set to have a 1:1 relationship.

The cutting feed mechanism has a structure in which the feed shaft 16 is intermittently moved by the ratchet feed PA mechanism 15 accompanying the main @50 rotations, and feeding of the cut is given to the base 14 for each cutting stroke of the cutting tool 3. However, since this cutting feed mechanism itself is similar to the cutting feed mechanism of a conventional vertical cutting machine, a detailed explanation will be omitted.

In the above configuration, when the main shaft 5 rotates, the ram 4 and the cutting tool 3 supported by it reciprocate linearly in the Y-Y direction from the top dead center position to the bottom dead center position as shown in FIG. On the way, it passes through the hole 1α of the sleeve member 1 in the longitudinal direction.

In the meantime, at a predetermined timing, the slide base 11 and the sleeve member 1 held therein are linearly reciprocated in the X-X direction perpendicular to the above Y-Y, and due to this movement, the slide base 11 and the sleeve member 1 held therein are reciprocated in the above-mentioned Y-Y direction. The cutting tool 3 moving linearly cuts the circumferential surface of the hole 1α of the sleeve member 1 at α′ in FIG.
Cut like this.

Thereafter, the base 14 is intermittently fed by the cutting feed mechanism for each stroke of the cutting tool, and as shown in FIGS.
, C/, and a blind groove 1b in the longitudinal direction is formed in the hole 1α of the sleeve member 1.

If the index table 13 is used as in the illustrated embodiment, after forming one blind groove 1b as described above, the sleeve member 1 can be formed by rotating the index table 13 and repeating the same cutting process as described above. It is convenient because multiple blind grooves can be formed within the hole 1α, but
If the purpose is just to form one blind groove, the index table 13 is omitted and the holder 2 is attached to the slide base 11.
It is also possible to adopt a structure in which the sleeve member 1 is held through the holder.

In the embodiment shown in FIG. 2, a blind groove having an arcuate bottom surface is formed in the longitudinal direction.
By designing the shape, various shapes can be obtained, not only arcuate, and it can be used not only for vertical milling machines in which the cutting tool moves in the vertical direction, but also in any machine tool in which the cutting tool moves in a straight line (for example, a shaping machine, etc.). ) can be applied to the device of the present invention.

As described above, according to the present invention, the cutting tool and the sleeve member, which is the workpiece, are moved synchronously in relation to each other, so that a blind groove in the longitudinal direction is formed in the hole of the sleeve member by the simple linear movement of each tool. It can be easily and accurately formed, and as mentioned above, each movement is a simple linear movement, so the mechanism of the entire device is extremely simple, compact, and inexpensive, as well as tools and sleeves. There is less interference with the hole in the part, the tool shank can be made thicker, and a smaller tool tip can be fitted into the shank, reducing tool costs.
This can bring about great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 2 is an explanatory view showing a cutting process performed by the apparatus of the present invention. DESCRIPTION OF SYMBOLS 1... Sleeve member, 2... Holder, 3... Cutting tool, 4... Ram, 5... Main shaft, 6.7... Sprocket, 8... Chain, 9...・Cam, 10...
- Roller, 11... Slide base, 12... Pressure spring, 13... Index table, 14... Base. That's it: 3'! talent 2

Claims (1)

[Claims] A cutting tool that reciprocates linearly along the longitudinal direction of a hole in a sleeve member, which is a workpiece, and a holder that holds the sleeve member, and the cutting tool moves in a direction perpendicular to the direction of movement of the cutting tool. It consists of a slide base that reciprocates in synchronization with the reciprocating stroke of the cutting tool, and a base that supports the slide base 3 in a reciprocating manner and moves intermittently in the cutting direction by a cutting feed mechanism. A blind groove machining device characterized in that an axial blind groove is cut in a hole of a sleeve member by linear motion of a tool and a sleeve member fixed to a slide base.