JPS58206375A - Chamfering device for hole - Google Patents

Abstract

PURPOSE:To automatically chamfer the opening end edge of a hole formed in a curved surface of a work, by using a chamfering device in which lapping means is moved back and forth and as well is swung in the direction perpendicular to the direction of back-and-forth movement. CONSTITUTION:The eccentric shaft part 4 of an eccentric shaft 3 which is rotated by driving a drive motor 1, alone repeatedly carries out swivelling motion with respect to the center axis thereof. Therefore, a back-and-forth shaft 10 which is engaged to the eccentric shaft part 4 through a crank pin 8 and a pin 11, is moved back and forth so that a swingable plate 20 and lapping means 21, 22 are also repeatedly moved in the same directions. Meanwhile, the rotation of the eccentric shaft 3 is transmitted from a bevel gear 5 attached to one end thereof, to a rotary shaft 31 through a bevel gear 30. Accordingly, an eccentric shaft 36 attached to the other end of the eccentric shaft 3 swings a guide plate 38 carried thereby around the back-and-forth shaft 10 as a swinging center, and as well swings the lapping means 21, 22 for chamfering the opening end edge of a hole formed in a curved surface of a work.

Description

[Detailed description of the invention] The present invention relates to a device for chamfering a large edge opening into a curved surface.

A hole provided in a cylindrical workpiece, for example, an oil reservoir provided in a crank pin a of a crankshaft as shown in Fig. 1, has a chamfered portion of approximately 45° to facilitate the introduction of oil. C is provided.

This chamfered part C is machined with oil, but the cylindrical crank pin a
Since the chamfer is provided on a curved surface, there is a drawback that sufficient chamfering cannot be achieved by machining only in the front-to-back direction using the conventional paper wrap method.

Therefore, chamfering was performed manually using, for example, a Bosch grinder using a shaped grindstone.

The present invention has been made in consideration of the above circumstances, and provides a paper wrap type chamfering device that can completely chamfer the workpiece as described above by mechanical work without manual work. This is what we are trying to provide.

The present invention includes a frame that holds a wrap means, a rotating shaft that is rotated from a drive shaft via a transmission mechanism, and a forward and backward movement axis that repeatedly moves forward and backward, and an eccentric part is provided on the rotating shaft, and the eccentric part is attached to the rotating shaft. The frame is engaged [7] and is caused to swing, and the frame is rotatably held on the forward and backward movement shaft to give a forward and backward movement, and the back and forth movement axis is set as the center of swing of the frame by the eccentric portion. This is a hole chamfering device characterized by:

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIGS. 2 and 3, reference numeral 2 indicates a drive motor, 2 an output shaft of the drive motor 1, and 3 an eccentric shaft connected to the output shaft 2. The eccentric shaft 3 has an eccentric shaft portion 4 having an eccentric axis with respect to the shaft center of the output shaft 2, and further has a bevel gear 5 concentrically with the output shaft 2 at the other end. Reference numerals 1 and 8 indicate eccentric shaft portions. 4 is a crank engaged, 9 is a bearing interposed therebetween, 10
11 is a pin that engages the crank 8 and the longitudinal axis lO, 12 is a frame, and 13.14 is a frame 12.
This is a bushing that slidably holds the forward and backward movement shaft 10.

The forward and backward movement shaft 10 has a rocking plate supported at its other end through a bearing 16 so as to be rockable. The old rocking plate 2 has wrap means 21 and 22 on the upper and lower sides, and the wrap means 21 and 22.
are provided with opposing paper holders n and 24, respectively. This paper holder is a trap in which polishing paper for polishing the workpiece is continuously fed and passed. The wrapping means is equipped with a device for supplying and winding up the vapor 5, a device for detecting paper cutting, and other necessary devices, and is automatically controlled.

30 is another bevel gear that meshes with the bevel gear 5, and the bevel gear I
is fixed to one end of a rotating shaft 31, which is rotatably held on the frame 12 by bearings 32 and 33, and has an eccentric shaft fixed to the other end. A bearing 37 is fitted onto the eccentric shaft 36, and the bearing 3
The outer periphery of the guide plate 7 penetrates between and comes into contact with the guide plates fixed to the swing plate member. Note that the bearing 37 that penetrates the guide plate portion may have another member fitted on the outside thereof so as to be brought into contact with the guide plate 38.

Reference numeral 50 denotes a part of a moving device that moves the entire device having the above structure back and forth and left and right.

The present invention is constructed as described above. First, the eccentric shaft 3 is rotated by the drive of the drive motor l, but only the eccentric shaft portion 4 makes a rotational movement (i.e., the eccentric shaft portion 4
The axis of the eccentric shaft 3 rotates around the axis of the eccentric shaft 3). Therefore, the crank 8 and the forward and backward movement shaft 10 engaged through the pin 11 move in the front and back direction as shown by the arrows in FIG.
22 also repeats the movement in the same direction.

On the other hand, the rotation of the eccentric shaft 3 is transmitted from a bevel gear 5 provided at one end thereof to the rotating shaft 31 via a bevel gear (9). Therefore, the guide plate provided at the other end that supports the eccentric shaft is allowed to swing about the forward and backward movement shaft 10. That is,
FIG. 4 is an explanatory diagram in which the amount of eccentricity of the eccentric shaft with respect to the rotating shaft 31 is exaggerated for ease of explanation, and as the rotating shaft 31 rotates, the eccentric shaft 36 moves in the direction of the arrow with respect to the axis of the rotating shaft 31. The eccentric shaft part that rotates and therefore penetrates the retaining hole 39 of the guide plate group moves between the guide plates in the direction indicated by the arrow, centering on the axis (not shown) of the forward and backward movement shaft 10 arranged above. make it sway.

As described below, the forward and backward movement and the rocking movement in the direction perpendicular to the direction of the forward and backward movement are caused by the wrap means 21 and 22.
given to. As a result, paper holders 23, 2
4 performs an operation in which both of these movements are combined, and by repeating this operation, the chamfering operation of the opening edge of the hole drilled in the curved surface of the workpiece is performed. That is, by inserting the work mark indicated by the chain line in FIG. 2 between the paper holders n and 24 and applying constant pressure from above and below, a predetermined chamfering operation is performed by the above movement.

As described above, according to the apparatus of the present invention, the chamfering operation of the opening edge of a hole drilled in a curved surface can be easily and reliably performed over the entire circumference by a mechanical system with a simple structure.

[Brief explanation of drawings]

FIG. 1 is a perspective explanatory view showing an example of a workpiece to be processed by the apparatus according to the present invention, FIG. 2 is a partial cross-sectional explanatory view of the apparatus according to the present invention, FIG. It is an explanatory view of the same rocking mechanism. 3... Eccentric shaft, 8... Crank, lO... Forward and backward movement axis, bending/bending/swinging plate, 2
1, 22...wrapping means, 31...
Axis of rotation. 36...Eccentric shaft 8, 1st r! IJ No. 45! l List, 〆ooO')< Figure 3

Claims (1)

[Claims] A frame that holds the wrap means, a rotating shaft that is rotated by rusting the transmission mechanism from the drive shaft, and a forward and backward movement axis that repeatedly moves forward and backward are provided, and the rotating shaft is provided with an eccentric portion, and the eccentric portion is provided with the frame. are engaged with each other to cause the frame to swing, and at the same time, the frame is rotatably held in the forward and backward movement shaft to provide forward and backward movement, and the back and forth movement axis is set as the center of swing of the frame by the eccentric portion. A device for chamfering holes.