JPH067852Y2 - Chip breaking punch - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is intended to shorten narrow strip-like chips that are continuously generated when a relatively deep hole is mainly drilled in a hard metal material such as a steel plate. The present invention relates to a chip breaking type punching device having a breaking mechanism.

(Prior Art) A conventional punching device for a hard metal material generally has a structure in which a punching body provided with a punching blade at its lower end is rotated and a punching operation is performed while it is axially fed at a constant speed. For this reason, narrow strip-shaped chips are continuously generated, and the chips may wind around the shank portion or the like to hinder the drilling work, and both edges of the chips of the hard metal material are sharp. However, there is a possibility that the chips may injure the worker.

(Problems to be Solved by the Invention) The present invention has been made in view of the above points, and the feed of the perforated body is interrupted intermittently (for example, several times per one revolution of the perforated body) during the perforating operation. Thus, it is an object of the present invention to provide a chip breaking type perforating apparatus capable of appropriately breaking a band-shaped chip to generate short and short chips and performing a smooth boring operation.

(Means for Solving the Problems) In the chip breaking type perforating apparatus according to the present invention, the perforated body disposed below the shank body with respect to the shank body located at the upper portion rotates integrally with the shank body. In the chip breaking type punching device configured to be appropriately shredded by the cutting blade of the punching body by axially projecting and retracting, the chip breaking type punching device is as follows: )-(E).

(a). A sleeve-shaped fixed body is provided around the bulge formed on the upper part of the shank body having a shank at the upper end and the lower end reaching the upper end of the perforated body. It is rotatably arranged with respect to (b). In an annular space formed between the fixed body and a portion below the bulging portion of the shank body, a sleeve-shaped feed force transmission body is rotated integrally with the shank body so as to make circumferential contact with the outer circumference of the shank body. And is installed so as to be movable in the axial direction, and (c). The lower end of the bulging portion and the upper end of the feed force transmitting body of the shank body are formed on opposed tapered surfaces having a reduced diameter on the opposite side, and at least one of these tapered surfaces is provided with ball fitting recesses at equal intervals. And the same number of balls as the number of the recesses are rotatably held by an annular retainer at equal intervals and are interposed so as to contact the both tapered surfaces and the inner circumferential surface of the fixed body, ). A perforated body having a perforation blade at the lower end and an insertion hole at the center of rotation can be brought into contact with and separated from the lower end of the feed force transmitting body, and the upper end of the perforated body can be rotated to the lower end of the shank body. Coupled via a sphere or roller so as to transmit force and to be movable in the axial direction, (e). An insertion hole is formed in the center of rotation of the shank body,
In the insertion hole and in the insertion hole communicating with the insertion hole,
The center pin is mounted so as to be able to move backward so that the tip projects toward the tip side from the perforated body.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall sectional view of the punching device, and FIG. 2 is II- of FIG.
II line enlarged sectional view, FIG. 3 (a) is a III-III line sectional view of FIG. 1, and FIG. 3 (b) is a front view of the shank body tip portion. In FIG. 1, reference numeral 1 denotes a shank body having a shank 1a at its upper end, and a bulging portion 1b having a radially expanded diameter is formed on an upper portion of an outer peripheral surface of the shank body 1. In addition, an insertion hole 1c for a center pin 8 which will be described later is formed in the shaft core portion of the shank body 1 from the lower end to an intermediate portion, and a spring 9a having a diameter slightly smaller than the insertion hole 1c is inserted in the insertion hole 1d. Is formed so as to communicate with the insertion hole 1c over the base end of the shank 1a. Further, as shown in FIG. 3, three rotation transmitting engagement elements 1e for the perforated body 6 which will be described later are provided on the lower end of the shank body 1 so as to project, and the joint surface (rotation direction side) of each engagement element 1e. To the sphere 1f
Is rotatably embedded. Reference numeral 2 is a sleeve-shaped feed force transmission body, and this feed force transmission body 2 is a bulging portion of the shank body 1.
Around the lower part of 1b, it is arranged so as to rotate integrally with the shank body 1 and to be movable in the axial direction through a restriction pin 3 that restricts the axial movement amount. In addition, 1h is an engaging groove of the regulation pin 3, and this engaging groove 1h is formed in the shank body 1. Further, tapered surfaces 1g and 2a having a reduced diameter on the opposite side are formed so as to face the lower end of the bulging portion 1b and the upper end of the feed force transmitting body 2, respectively. A plurality of (four in this embodiment) ball fitting recesses 2b are formed at equal intervals on the taper surface 2a on the second side.

Reference numeral 4 denotes a swivel-shaped fixed body, which extends around the bulging portion 1b of the shank body 1 below the bulging portion 1b and is rotatable with respect to the bulging portion 1b ( (Relatively rotatable)
Be attached to. In the figure, 1i is a retaining ring on the shank body side, and 2c is a retaining ring on the feed force transmitting body 2 side. In addition, 4a is a bearing bush.

Reference numeral 5 denotes a plurality of feeding force transmitting balls (similar to the recesses 2b) (steel balls). These balls 5 are rotatably and equidistantly held by an annular retainer 5a as shown in FIG. The balls 5 are attached to the tapered surfaces 1g, 2a and the fixed body 4 respectively.
It is rotatably interposed in the annular space portion of the fixed body 4 and the shank body 1 so as to come into contact with the three points on the inner peripheral surface thereof. Reference numeral 5b is a ball 5 holding hole formed in the annular retainer 5a at equal intervals.

Reference numeral 6 denotes a cylindrical perforated body in which a large number of perforating blades (not shown) are implanted at the lower end and the lower end is opened, and the upper end of the perforated body 6 is inserted into the lower end opening of the feed force transmitting body 2. A possible insert 6a is formed.

In addition, a protrusion 6b that is mutually engageable with the rotation transmitting engagement element 1e described above is formed at the upper end of the insertion portion 6a.
An annular groove 6c for fitting the perforated body 6 mounting ball 7 is formed around the middle portion of the insertion portion 6a. On the other hand, in the lower part of the feed force transmission body 2, the accommodation holes 2d for the plurality of perforated bodies 6 and the attachment balls 7 are formed by penetrating laterally, and each accommodation hole is formed.
A ball 7 is loaded in 2d, and an extrusion operation sleeve 7a for the ball 7 is disposed around the ball 2d so as to be axially movable and urged downward by a spring 7b. 7c is a retaining ring for the sleeve 7a.

Then, the perforated body 6 has its insertion portion 6a inserted into the lower end opening of the feed force transmission body 2, and the sphere 1f is attached to the rotation transmission engagement element 1e.
By engaging the protrusion 6b via the ball and inserting the ball 7 into the annular groove 6c, the ball 7 can be integrally rotated with respect to the lower end of the shank body 1 and movable in the axial direction via the sphere 1f within a certain range. In this state, it is detachably attached to the lower end of the feed force transmission body 2.

8 is a centering pin for drilling positioning. The centering pin 8 is an insertion hole 6d formed in the center of the insertion portion 6a of the drilled body 6.
It is inserted in the insertion hole 1c at the center of the shank body 1 so that it can be projected and retracted (moved in and out). In addition, a first spring having a weak spring force for urging the center pin 8 is provided around the upper end of the center pin 8.
A locking step 8b at the lower end of the spring 9a is formed, and around the center pin 8 therebelow, a second spring 9b having a strong spring force for urging the center pin 8 is engaged with an engaging groove 8c of a locking ball 9c at the lower end. Is formed in a ring shape. Then, with the punched body 6 attached to the lower end of the feed force transmission body 2,
The first spring 9a is arranged between the base end of the loading hole 1d of 9a and the locking step 8b at the upper end of the center pin 8, and between the base end of the insertion hole 1c of the center pin 8 and the locking ball 9c. By disposing the second spring 9b, the center pin 8 is urged downward (in the tip direction). That is, the center pin 8
It is mounted so that it can move upward (backward).

Reference numeral 1j denotes an annular groove formed in the inner peripheral surface of the middle portion of the insertion hole 1c of the center pin 8, and the second spring for the center pin 8 with the engaging ball 9c fitted in the annular groove 1j.
It is configured so that the biasing force of 9b does not act.

9d is a seat at the lower end of the second spring 9b, and 9e is a locking ball.
9c retaining ring.

Reference numeral 10 denotes an oil supply hole, which is formed by penetrating the peripheral walls of the fixed body 4 and the shank body 1 to form a spring 9a.
It is configured to communicate with the charging hole 1d, through which the cutting oil is fed to the lower end of the drilling blade portion through the gap between the drilling body 6 and the center pin 8.

Next, the operation of the above embodiment will be described. In FIG. 1, the shank 1a is mounted on a punching machine (a drilling machine or a drill; not shown) that rotates and feeds, and the drilling work is started. The rotational force transmitted from the perforator to the shank body 1 is transmitted to the perforated body 6 via the rotation transmitting engagement element 1e having the sphere 1f interposed therebetween and the projection 6b. The axial feed force transmitted from the punch to the shank body 1 is transmitted from the tapered surface 1g of the shank body 1 to the ball 5 and the feed force transmission body 2.
It is transmitted to the feed force transmitting body 2 via the tapered surface 2a of the and is transmitted from the feed force transmitting body 2 to the perforated body 6.

At this time, the shank body 1 and the feed force transmission body 2 integrally rotate at the same number of rotations via the regulation pin 3 and each ball 5
2 contacts the inner peripheral surface of the fixed body 4, and as shown in FIG. 2, the balls 5 rotate in the opposite direction to the shank body 1 and the feed force transmission body 2 while rotating together with the annular retainer 5a. Then, it revolves in the same direction as the feed force transmitting body 2 and the revolution angular velocity of the ball 5 becomes slower than the rotational angular velocity of the shank body 1 or the feed force transmitting body 2 by a mechanism similar to the planetary gear mechanism. Therefore, a difference occurs between the rotational angular velocity of the shank body 1 or the feed force transmission body 2 and the revolution angular velocity of each ball 5, and each ball 5 intermittently sinks into the recess 2b of the tapered surface on the side of the feed force transmission body 2. become. Then, when the ball 5 sinks into the recess 2b, the rotation-transmitting engagement element 1e of the shank body 1 is caused to pass through the spherical body 1f with respect to the projection 6b of the perforated body 6 by the feed force acting in the axial direction. To descend. In other words, in this state, the perforated body 6 is temporarily free from the shank body 1 in the axial direction (direction in which the feed force acts) (a state in which it can descend). Therefore, during this state,
Since the feed force from the shank body 1 to the perforated body 6 via the feed force transmission body 2 is temporarily interrupted, the perforated body 6 rotates without being pressed by the feed force. 6 The chips that have been continuously cut by the piercing blade at the lower end will be interrupted. In this way, chips are intermittently cut into short pieces during the boring operation.

In this punching device, during the punching work, the punching body 6 vertically moves (projects / retracts) in the axial direction to cut the chips as described above, but the center pin 8 is always the center of the punching work. Since the position is determined and the perforated body 6 is always rotated at the concentric position, there is no problem in the perforation work due to the movement in the axial direction (vertical movement). In particular, this action greatly contributes to the accurate positioning of the punching position at the beginning of the punching work, that is, at the beginning of the punching of the punched body 6.

In this punching device, the rotational force is transmitted between the rotation transmitting engagement element 1d at the lower end of the shank body 1 and the projection 6b at the upper end of the punching body 6, and the axial feed force is transmitted from the shank body 1. Since the force is transmitted to the perforated body 6 through the body 2, the forces in two directions pass through different routes from the shank body 1 to the perforated body 6.
And the positioning action of the center pin 8 at the drilling position, the vibration caused by the axial movement has a minimal effect on the rotation, that is, the drilling work, and the chip breaking action is In addition to being obtained, it is possible to maintain a smooth boring work which is a basic operation. Specifically, a relatively beautiful cutting surface can be obtained, and the piercing blade is unlikely to fall off.

Particularly, since the rotational force is transmitted from the shank body 1 to the perforated body 6 via the spherical body 1f, the shank body 1
The dynamic frictional force between the piercing body 6 and the piercing body 6 is reduced, the piercing body 6 is not affected by the axial movement of the shank body 1, the piercing body 6 can be pierced smoothly, and stable piercing work can be continued for a long time.

By the way, FIGS. 4 (a) and 4 (b) show another embodiment of the rotation transmitting engagement element 1e, which is a roller instead of the spherical body 1f.
1f 'is embedded rotatably.

FIG. 5 shows another embodiment in which the perforated body 6 is different, except that the perforated body 6 for small-diameter perforation is replaced by the perforated body 6'for small-diameter perforation. Is attached.

The perforated bodies 6 and 6'are not limited to the structure of the above embodiment,
Various structures can be used.

(Effects) As described above, the punching device of the present invention has the following effects due to having the above-described configuration and operation.

(1). Transmission of the feed force from the shank body to the drill body is performed by the ball interposed between the shank body and the tapered surface of the feed force transmitter through the feed force transmitter, and the rotational force is transmitted from the shank body to the bore body. Since it is configured to be directly transmitted to, the chips are shredded, unnecessary vibrations can be avoided, and smooth drilling work can be maintained.

In addition, since the chips are shredded, the chips are prevented from winding up and obstructing the rotation of the punching device, and the drilling work can be continued for a long time, improving work efficiency and injuring the chips. The safety of work is also improved.

(2). Further, during the drilling work, the drill body moves in the axial direction to cut the chips, but always determines the center pin center position and always rotates the drill body at the concentric position.
The axial movement does not cause any inconvenience in drilling work.

(3). Since the rotational force is transmitted from the shank body to the perforated body through the sphere or the roller, the dynamic frictional force between the shank body and the perforated body is reduced, and the influence of the axial movement of the shank body is reduced. The perforated body does not receive much,
Since the holes can be smoothly drilled, stable drilling work can be continued for a long period of time.

[Brief description of drawings]

1 is an overall sectional view showing an embodiment of the punching device of the present invention, FIG. 2 is an enlarged sectional view taken along line II-II of FIG. 1, and FIG. 3 (a) is a sectional view taken along line III-III of FIG. Fig. 3 (b) is a front view of a shank body tip portion, Fig. 4 (a) is a sectional view of the same mode as Fig. 3 (a) showing another embodiment, respectively.
FIG. 5B is a front view of the same mode as FIG. 3B, and FIG. 5 is a partial sectional view showing another embodiment. DESCRIPTION OF SYMBOLS 1 ... Shank body, 1a ... Shank, 1b ... Swelling part, 1g ... Tapered surface, 2 ... Feed force transmitting body, 2a ... Tapered surface, 2b ... Recess, 5 ... Feed force transmitting ball, 5a ... Annular retainer, 6
... perforated body.

Claims (2)

[Scope of utility model registration request] 1. A perforated body, which is disposed below the shank body with respect to an upper shank body, integrally rotates and intermittently projects and retracts in the axial direction, whereby In a chip breaking type punching device configured to appropriately cut chips cut by a punching blade, the chip breaking type punching device is provided with the following configurations (a) to (e). (a). A sleeve-shaped fixed body is provided around the bulge formed on the upper part of the shank body having a shank at the upper end and the lower end reaching the upper end of the perforated body. It is rotatably arranged with respect to (b). In an annular space formed between the fixed body and a portion below the bulging portion of the shank body, a sleeve-shaped feed force transmission body is rotated integrally with the shank body so as to make circumferential contact with the outer circumference of the shank body. And is installed so as to be movable in the axial direction, and (c). The lower end of the bulging portion and the upper end of the feed force transmitting body of the shank body are formed on opposed tapered surfaces having a reduced diameter on the opposite side, and at least one of these tapered surfaces is provided with ball fitting recesses at equal intervals. And the same number of balls as the number of the recesses are rotatably held by an annular retainer at equal intervals and are interposed so as to contact the both tapered surfaces and the inner circumferential surface of the fixed body, ). A perforated body having a perforation blade at the lower end and an insertion hole at the center of rotation can be brought into contact with and separated from the lower end of the feed force transmitting body, and the upper end of the perforated body can be rotated to the lower end of the shank body. Coupled via a sphere or roller so as to transmit force and to be movable in the axial direction, (e). An insertion hole is formed in the center of rotation of the shank body,
In the insertion hole and in the insertion hole communicating with the insertion hole,
The center pin is mounted so as to be able to move backward so that the tip projects toward the tip side from the perforated body. 2. The chip breaking type perforation apparatus according to claim 1, wherein the perforation body is detachably attached to the feed force transmission body.