JPH042748Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a machined hole burr removal device for removing burrs formed on the inner peripheral surface of a machined hole of a workpiece.

[Conventional technology]

Traditionally, burrs on the inner circumferential surface of the machined hole of the workpiece are
This was done by forming a file part at the tip of the burr removal rod with an outer diameter slightly smaller than the inside diameter of the machined hole, and inserting the file part at the tip into the process hole while rotating the burr removal rod. .

[Problem that the invention attempts to solve]

However, with this reversing method,
If the inner diameter of the machined hole is even slightly different, the outer diameter of the file part must be replaced with a burr bar that matches the machined hole, and a large number of burr bars with different outer diameters of the file part are required. This replacement work was troublesome. In addition, in order to sufficiently remove the burrs that protrude from the inner circumference of the machined hole, the outer diameter of the file must be slightly smaller than the inner diameter of the machined hole.
The outer diameter of the file part must be formed with high machining accuracy, which increases the machining cost of the burr bar.
Nevertheless, it has been impossible to bring the outer diameter of this file into even contact with the entire inner circumference of the machined hole, so it has been impossible to completely remove the burr.

[Means for solving problems]

In order to solve the above-mentioned problems, the machined hole burring device according to the present invention has a holding member that is rotated by a rotary drive means and moved back and forth in the axial direction of rotation by a forward and backward drive means. The burr member is attached so that rotation is transmitted from the member and can swing freely relative to the holding member, and the burr member is restricted from swinging so that the burr portion formed at the tip is approximately A swing regulating means is provided to be positioned at the center of rotation, and when the holding member is advanced by the advancing/retracting drive means and the burr part is fitted into the machining hole of the workpiece, the regulation of the swing of the burr member by the swing regulating means is released. It is characterized by the provision of a means for lifting restrictions.

The burr member has its base pivoted on the holding member with an axis perpendicular to the rotation axis, so that rotation is transmitted from the holding member and is swingable with respect to the holding member. I can do it. However, the burr member is not limited to being attached using this configuration; the base may be supported by a holding member using a spherical bearing, etc., and the rotation may be transmitted by other methods. It can also be attached to the holding member via a universal joint so that it can swing not only in one direction but also in the entire circumferential direction. The burr member attached in this way is
As the holding member rotates, its centrifugal force urges it in at least one direction of swinging, causing the burred portion at the tip to swing around. In this case, instead of being biased by centrifugal force, the burr member may be biased in one direction of rocking by a spring or the like in advance. The burr part formed at the tip of the burr removal member scrapes off the protruding burr by swinging around and coming into contact with the inner peripheral surface of the machined hole. It may be formed by Moreover, since this burr portion only needs to touch the inner circumferential surface of the machined hole by swinging around inside, the accuracy is not a problem as long as the outer diameter is appropriately smaller than the inner diameter of the machined hole.

[Effect]

With the swing being restricted by the swing regulating means,
When the burr member is driven by the rotational drive means and rotates along with the holding member, the burr portion at the tip is also located approximately at the center of rotation, so that it rotates on the same axis without swinging around. In this state, the workpiece is placed in front of the burr removal member so that the center axis of the machined hole with the burr on the inner peripheral surface coincides with this rotation center, and the holding member is advanced by the advance/retreat drive means. Along with this, the burr member also moves forward, and the burr portion at the tip can be fitted into the machined hole. At this time, if a swing regulating means is not provided, even if the range of swing is regulated to some extent in advance, when the swinging burr part is inserted into the machined hole, the opening end of the machined hole Touching it will cause damage, making it impractical for practical use. When the burr portion is fitted into the machined hole, the restriction release means operates automatically or manually to release the restriction on the swinging of the burr member by the swing restriction means. When the swinging of the burr member is released, the burr portion at the tip comes into contact with the inner circumferential surface of the machined hole while swinging around. Therefore, the burr protruding into the machined hole is reliably scraped off and removed by the burr removal portion. In this case, the burr is only pressed against the inner circumferential surface of the machined hole by centrifugal force or a weak biasing force such as a spring, so there is little risk of cutting into the inner circumferential surface that is not burred. Does not occur. After the burr removal is completed, the burr removal member that has been pulled out from the machined hole can be removed from the outside by operating the swing regulating means again to restrict the oscillation of the burr removal member and then moving the holding member backward by the forward/backward drive means. There is no need to swing around unnecessarily.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, the swing shaft 1 is provided with a chuck portion 2 at its front end, and a burr rod 3 is attached to the chuck portion 2 to constitute a ``burr member''. The chuck portion 2 can mount the burr rod 3 coaxially with the swing shaft 1 by tightening and fixing the shaft rear portion of the burr rod 3. The front end of the burr bar 3 is knurled and has a "burr part".
A file portion 4 is formed. Swing axis 1
has a substantially axial shape with a diameter sufficiently larger than that of the burr removal rod 3, and a spherical cylinder 5 having a spherical outer circumference is fitted at a slightly rearward part of the center part, and a spherical surface supporting this spherical cylinder 5 is fitted. It is swingably attached to a holding member 7 via a bearing 6. The holding member 7 has a cylindrical shape into which the swing shaft 1 can be fitted with a sufficient space therebetween, and the spherical bearing 6 is fitted into the substantially central part of the inner periphery of the cylindrical shape, and the spherical bearing 6 is fitted into the retaining ring. It is tightened and fixed with screws 8. In addition, the holding member 7
A pin 9 is fixed to the rear end of the cylindrical shape by passing through it in a direction perpendicular to the rotation axis, and the pin 9 is inserted into the pin hole 10 bored in the rear end of the internal swing shaft 1. By fitting the holding member 7, the rotation of the holding member 7 is transmitted to the swing shaft 1. The pin hole 10 has an inner diameter sufficiently larger than the outer diameter of the pin 9 so that the swing shaft 1 can swing about the spherical bearing 6 by the difference between the inner diameter and the outer diameter. ing. Further, between the inner circumferential side of the cylindrical rear end of the holding member 7 and the rear end of the swing shaft 1, there is provided a groove for biasing the swing shaft 1 in a direction perpendicular to the axial direction of the pin hole 10. The compression spring 11 is compressed. In the cylindrical front part of the holding member 7,
A swing shaft locking tube 12 serving as a "swing regulating means" is fitted so as to be slidable along the inner circumference. In addition, this swing shaft locking cylinder 12 has a long hole 13 in the axial direction formed in the side wall, and a guide pin 14 protruding inward from the cylindrical inner circumferential surface of the holding member 7 is inserted into the long hole. By fitting into 13, the sliding movement is guided. Furthermore, a compression coil spring 15 is compressed between the swinging shaft locking cylinder 12 and a locking ring 8 screwed onto the substantially central part of the cylindrical inner circumference of the holding member 7, and the swinging shaft is locked. The cylinder 12 is urged forward. The swing shaft locking cylinder 12 that is biased by this compression coil spring 15 and slides forward is
A retaining ring 16 whose front end inner periphery fits without play on the front end outer periphery of the swing shaft 1 and is locked to the swing shaft 1.
It is designed to stop the oscillation when it comes into contact with. Further, at the rear of the outer periphery of the front end of the swing shaft 1 into which the swing shaft locking tube 12 is fitted, a tapered portion 17 whose outer diameter gradually decreases is formed. A threaded portion 19 for attaching to the drive device 18 shown in FIG. 2 projects rearward from the cylindrical rear end of the holding member 7.

As shown in FIG. 2, the drive device 18 is configured such that the threaded portion 19 of the holding member 7 is screwed onto the front end of the main shaft 20. At this time, the key 26 shown in FIG. 1 is fitted into the threaded portion 19 and is prevented from rotating. The main shaft 20 is rotatably attached to a bearing 22 fixed on a base 21, and serves as a "rotation drive means".
It is rotationally driven by a motor 23. The base 21 is supported on a slide rail 24 so as to be slidable in the direction of the rotational axis of the main shaft 20, and can be moved forward and backward by a cylinder 25 serving as an "advance/retreat drive means." In front of the main shaft 20, a locking cylinder stopper 2 is provided as a "restriction release means".
7 are arranged, and the burr rod 3 and chuck portion 2 of the swing shaft 1 are advanced forward by the cylinder 25.
Only the shaft is allowed to pass through, and the movement of the swing shaft locking cylinder 12 is stopped.

The procedure for burring the inner peripheral surface of an oil hole formed in the crankshaft of an engine will be explained using the machined hole burring device of this embodiment configured as described above.

As shown in FIG. 2, when a T-shaped oil hole 29 is formed in the crankshaft 28, this oil hole 2
A burr is produced on the inner circumferential surface of the portion where the through hole No. 9 intersects with the vertical hole. Therefore, the crankshaft 28 is fixed in front of the locking cylinder stopper 27 by the pedestal 30 and the clamp device 31 so that the through-hole side of the oil hole 29 coincides with the center of rotation of the main shaft 20. When the base 21 is located at the rear and the main shaft 20 is moved backward, the inner periphery of the front end of the swing shaft locking cylinder 12 is fitted with the outer periphery of the swing shaft 1 without any play due to the bias of the compression coil spring 15. , the burr removal rod 3 is located at the center of rotation. When the motor 23 is driven to rotate the main shaft 20, the rotation is transmitted to the swing shaft 1 via the holding member 7, and the burr rod 3 rotates on the same axis without swinging around. When the cylinder 25 is driven to slide the base 21 forward in this state, the main shaft 20 will advance while rotating, and the file portion 4 of the burr removal rod 3 will pass through the locking cylinder stopper 27. and fit into the oil hole 29 of the crankshaft 28. The front end of the swing shaft locking cylinder 12 is locked in the locking cylinder stopper 27 through which the burr removal rod 3 and the chuck part 2 of the swing shaft 1 have passed, at the point where the file part 4 is inserted into the oil hole 29. However, since only this swing shaft locking cylinder 12 cannot advance any further, this swing shaft locking cylinder 1 is removed from the outer periphery of the swing shaft 1 that is about to advance further.
The inner periphery of the front end of the holding member 7 comes off and is compressed inside the holding member 7 against the bias of the compression coil spring 15, as shown by arrow A in FIG. Then, the swing shaft 1 is biased by the compression spring 11 and swings around the spherical bearing 6 as a fulcrum, and as shown by arrow B in FIG. It will cause it to shift. For this reason, the file portion 4 has the oil hole 29
It swings around inside and advances further into the interior while making contact with the entire inner circumference, reaches the part where it intersects with the vertical hole, and scrapes off the burr that overhangs the inner circumference. When the burr is completely removed by swinging the file portion 4, the cylinder 25 is driven to slide the base 21 rearward. Then, the file portion 4 of the burr removal rod 3 also retreats and comes out of the oil hole 29 of the crankshaft 28. At this time, the locking tube stopper 27
As the holding member 7 moves back, the swing shaft locking cylinder 12 is also stretched out by the bias of the compression coil spring 15, and is guided by the tapered portion 17 to the front again on the outer periphery of the swing shaft 1. The inner peripheries of the ends will be fitted together. For this reason, the file portion 4 has the oil hole 29
Just before it breaks free, it stops spinning and returns to the center of rotation. Therefore, the file part 4
swings around only in the oil hole 29, so this oil hole 2
There is no risk of damaging the opening end when fitting into and removing from the opening.

[Effect of idea]

As described above, the machined hole burring device according to the present invention rotates by the rotation drive means, and rotates from the holding member to the holding member that moves forward and backward in the axial direction of rotation by the advance and retreat drive means. At the same time, the burr member is attached so that the burr member can be freely swung relative to the holding member, and the burr member formed at the tip is positioned approximately at the center of rotation. regulation release means for releasing the restriction on the swinging of the burr member by the swing restriction means when the holding member is advanced by the advancing/retracting drive means and the burr part is fitted into the machining hole of the workpiece; This is a configuration with a

As a result, the burr comes into contact with the inner peripheral surface of the machined hole by swinging around, so even if the inner diameter of the machined hole changes slightly, the burr will have the same outer diameter as long as it is within the swing range. You can do deburring work. Therefore, if the inner diameter of the machined hole is within a certain range, one type of burr can cover all the burrs, so there is no need to prepare a burr for each inner diameter of the machined hole. Furthermore, the outer diameter of the burr portion only needs to be appropriately smaller than the inner diameter of the machined hole, so high processing accuracy is not required. Furthermore, since the burr portion evenly touches the entire inner circumference of the machined hole by swinging around, no burr is left behind. Therefore, the number of types of burrs to be prepared can be reduced and the machining accuracy can be lowered, which is not only economically advantageous, but also reduces the time and effort required to replace burrs. This has the advantage that it is possible to perform complete burr removal work.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, in which Figure 1 is a vertical cross-sectional front view showing a part of the machine for burring a machined hole, and Figure 2 is a front view of a part of the machine for burring a machined hole. FIG. 3 is a front view of the device. 1 is a swing shaft (burr removal member), 3 is a burr removal rod (burr removal member), 4 is a file portion (burr removal portion), 7 is a holding member, 12 is a swing shaft locking tube (swing regulating means) ), 23 is a motor (rotation drive means),
25 is a cylinder (advancing/retracting driving means), 27 is a locking cylinder stopper (restriction releasing means), 28 is a crankshaft (workpiece), and 29 is an oil hole (machined hole).

Claims (1)

[Scope of utility model registration request] A holding member that is rotated by the rotational drive means and advanced and retreated in the axial direction of rotation by the forward and backward drive means;
The burr member is attached so that rotation is transmitted from the holding member and is swingable relative to the holding member, and the burr member is formed at the tip to restrict the swinging of the burr member. A swing regulating means is provided to position the burr member approximately at the center of rotation, and when the holding member is advanced by the advancing/retracting drive means and the burr part is fitted into the machined hole of the workpiece, the swing regulating means regulates the swing of the burr member. A machined hole burr removal device characterized by being provided with a restriction release means for releasing the burr.