JPS6399125A - Tapping unit - Google Patents

Abstract

PURPOSE:To make it possible to machine a screw hole as an attachment with a high degree of accuracy, by supporting a guide member having its inner surface formed therein with a female thread part adapted to be engaged with a male part on a rotary shaft, on the mounting section of a support shaft, movably in the axial direction thereof. CONSTITUTION:.When a drive member 7 and a rotary shaft 16 are normally rotated together with a spindle 4, a male thread part 19 is screwed into a female part 21 have the same pitch as that of a top 17, and is lowered to cut a thread in a workpiece. After completion of thread cutting, the spindle 4 is reversed so that the tap 17 comes away from the thread hole. In this arrangement, during the tap is normally rotated while it is lowered, when it abuts against a part which is other than a prepared hole, the lowering of the rotary shaft 16 is limited so that upward force is exerted to a guide member 20, and therefore a ball 29 is moved in the direction B overcoming a coil spring 27 to actuate a safety switch 30 so that the spindle 4 and the rotary shaft 16 are reversed to prevent unreasonable force from being exerted to the tap 17. Thus, it is possible to form a thread hole in the workpiece as an attachment for a machining center of the like with a high degree of accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention J (Field of Industrial Application) The present invention relates to a tapping unit that forms a screw hole in a workpiece while applying a feed motion to the tap.

(Prior Art) Conventionally, when forming a screw hole in a workpiece using a tap in a processing device such as a machining center, the tap is attached to the main shaft, and the head supporting the main shaft is synchronized with the rotation of the main shaft to form a screw hole in the workpiece. It is moved toward the workpiece.

(Problem to be solved by the invention) However, in order to move the head in synchronization with the rotation of the spindle in a machining center, for example, a rotary encoder is provided on the spindle to detect the rotation of the spindle, and the detection results are calculated. Since the movement of the head is controlled by using a coil spring, it is impossible to match the movement amount perfectly with the pitch of the tap in terms of accuracy. The chuck can be slightly displaced in the axial direction by supporting the chuck, and if the workpiece is thin, the machining accuracy of the screw hole will decrease due to the spring force of the coil spring acting on the chuck. There is a drawback that
Additionally, thread cutting with a tap was impossible with those without a rotary encoder.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a tapping unit that can be attached to a processing device such as a machining center in an attachment manner to form a highly accurate screw hole in a workpiece.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a drive body that is detachably connected to the main shaft of a processing device such as a machining center rotated by a drive source and rotates integrally with the main shaft, A supporting member is provided which rotatably supports the driving body and is removably and immovably connected to a stationary part such as the frame of the processing device when the driving body is connected to the main shaft, and has a tap at one end. A rotating shaft is provided, which is attached and has a J3 screw portion formed on the outer periphery with a pitch equal to that of the tap, is connected to the driving body so as to be movable in the axial direction, and receives rotational force from the driving body; The present invention is characterized in that a guide member having an inner circumference formed with a female threaded portion for threading the threaded portion is supported movably in the axial direction by a mounting portion provided on the support member.

(Function) According to the above means, when the tap is rotated, the tap is accurately sent in the axial direction according to its bit, so that a highly accurate screw hole can be easily manufactured with a processing device such as a machining center. .

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a head of a machining center, which is a processing device, and is rotated by a drive source via a ball bearing 3 in a main bearing 2. A cylindrical main shaft 4 is rotatably supported.A tapered portion 5 is provided on the inner periphery of the lower end of the main shaft 4, and a chuck device 6 is provided on the inner periphery of the main shaft 4.

Reference numeral 7 denotes a drive body detachably connected to the tapered part 5 of the main @4 by fitting, and a chuck receiver 7 provided at the upper end of this drive body.
The chuck device 6 is chucking a. A convex portion 4a protruding from the lower end of the main shaft 4 is fitted into a recess 7b provided at the intermediate outer peripheral portion of the drive body 7, so that the rotation of the main shaft 4 is transmitted to the drive body 7. A cylindrical support part 8 is integrally extended at the lower end of the drive body 7, and a cylindrical part 10 protruding from the upper surface of the support member 9 is attached to the support part 8 via a ball bearing 11. It is rotatably supported on the inner circumference. A convex portion 12 is provided on the upper surface of the support member 9 to project at a predetermined distance from the cylindrical portion 10.
One shaft body 13 is inserted into a recess 12a formed in 2. This shaft body 13 is removably fitted into four parts 15a of a support block 15, which serves as a stationary part and which is attached to a bearing holder 14 fixed to the lower surface of the main bearing 2.

Reference numeral 16 denotes a rotating shaft on which a chuck device 18 for attaching a tap 17 is attached to the lower end, and a male thread 19 with the same pitch as the tap 17 is carved on the intermediate outer circumference of the rotating shaft. A connecting portion 16a having a rectangular cross section formed at the upper end is fitted and connected to a connecting hole 7C having a rectangular cross section formed at the intermediate inner peripheral portion of the drive body 7 so as to be movable in the axial direction. Reference numeral 20 denotes a cylindrical guide member, an internal threaded part 21 formed on the inner circumference thereof is screwed into the external threaded part 19, and the guide member 20 is attached to a mounting part 22 formed at the lower end of the support member 9.
is inserted into the inner periphery of the shaft so as to be movable in the axial direction. 23.23
are four parts formed on the outer periphery of the guide member 20, and the support member 9 has a horizontal hole 2 facing the recessed part 23.
4 and 25 are formed, and one horizontal hole 24 has a ball 26.
The coil spring 27 is stored, and the left end in the figure is the backing plate 2.
The other side hole 25 houses a ball 29 and a safety switch 30. Reference numeral 31 denotes an oil path formed from the support block 15 through the shaft body 13, the support member 9, and the guide member 20, and lubricating oil is transmitted through this oil path 31 to the internal threaded portion 21 of the guide member 20. axis 1
It is supplied to one male threaded part of No. 6.

Next, the effect of the above layer formation will be explained. When the main shaft 4 is rotated in the normal direction, the driving body 7 is also rotated in the normal direction, and the rotating shaft 16 is accordingly rotated in the normal direction. When the rotating shaft 16 is rotated forward, the male threaded portion 19 is screwed into the female threaded portion 21, and the rotation 6116 descends in accordance with the rotation of the rotating shaft 16, but the amount of descent is The value matches the bit of the tap 17, and the tap is screwed into the prepared hole of the workpiece placed on a table (not shown) to cut the thread. When the rotary shaft 16 is lowered by a predetermined distance and thread cutting is completed, a limit switch (not shown) is activated to rotate the main shaft 4 in the opposite direction, and the rotary shaft 16 is raised while rotating in the reverse direction, and the tap 17 starts thread cutting. It escapes from the screw hole that has finished.

On the other hand, when the rotating shaft 16 and the tap 17 descend while rotating in the forward direction, if the workpiece is set incorrectly and the tap 17 hits a part of the workpiece that is not the pilot hole, the descending of the rotating shaft 16 is restricted. Therefore, an upward moving force is applied to the guide member 20. Therefore, the guide member 20 is
The ball 26 is engaged with the recess 23 by the biasing force of the coil spring to prevent the guide member 20 from rising during normal tapping. However, when the downward movement of the rotary shaft 16 is regulated as described above and an upward moving force is applied to the guide member 20, the ball 26 moves against the coil spring 27 as indicated by the arrow
In order to be moved in the direction, the guide member 20 is moved upward. Along with this, the ball 29 is moved in the direction of arrow B, and the safety switch 30 is activated by the ball 29, so that the main shaft 4 is rotated in the opposite direction and the rotating shaft 16 is raised while being rotated in the opposite direction. This prevents excessive force from being applied to the tap 17 f1. Note that when the jack V device 6 is opened, the drive body 7 moves to the taper portion 5 of the main shaft 4.
The shaft body 13 is removed from the recess 15a of the support block 15, and another machining shell is installed on the main shaft 4.

In the above configuration, a unit for thread cutting is installed on the main shaft 4.
I, one male threaded part with a pitch equal to the pitch of the tap 17 is formed on the outer periphery of the rotating shaft 16 provided in the unit, and the male threaded part is screwed into the inner periphery of the guide member 20. Since the female threaded portion 21 is formed, the tap 17 can be fed accurately according to the rotation, even though it has a simple configuration, and even when the workpiece is thin, it can be threaded with high precision. Pores can be formed. In the above configuration, since there is no need to displace the main spindle 4 in the axial direction, it is possible to use a machining center that does not have a rotary encoder that detects the rotation of the main spindle 4 and moves the head to make a highly accurate screw hole in the workpiece. can be formed very easily.

[Effect of the Invention 1] As is clear from the above description, the present invention provides a drive body that is detachably connected to the main shaft of a processing device such as a machining center that is rotated by a drive source and rotates about the main shaft. , a support member is provided which rotatably supports the driving body and is removably and immovably connected to a stationary part such as a frame of the processing device when the driving body is connected to the main shaft, and has a tap at one end. A rotary shaft is provided, in which a male screw portion having a pitch equal to that of the tap is formed on the outer circumferential portion thereof, and is connected to the driving body so as to be movable in the axial direction, and to which rotational force is applied from the driving body. A guide member having an inner circumferential portion formed with a female thread portion into which the male thread portion of the rotating shaft is screwed is supported movably in the axial direction by a mounting portion provided on the support member. Therefore, although it has a simple structure, it can be attached to a processing device such as a machining center in an attachment manner, and a highly accurate screw hole can be formed in a workpiece, which is an excellent effect.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of a main part showing an embodiment of the present invention. In the drawing, 1 is a machining center (processing device), 4 is a main shaft, 7 is a drive body, 9 is a support member, 15 is a support block (stationary part), 16 is a rotating shaft, 17 is a tap, 18 is a chuck device, and 19 is an orifice. 20 is a guide member, 21 is a female threaded portion, and 22 is a mounting portion.

Claims (1)

[Claims] 1. A processing device such as a machining center in which a cutting worker or the like is attached to a main shaft rotated by a drive source to cut a workpiece, etc., and a drive body that is detachably connected to the main shaft and rotates integrally with the main shaft. a support member that rotatably supports the driving body and is detachably and immovably connected to a stationary part such as a frame of the processing device when the driving body is connected to the main shaft; and a support member having a tap at one end. a rotating shaft that is attached and has a male threaded portion with a pitch equal to the tap on its outer circumferential portion, is connected to the driving body so as to be movable in the axial direction, and is applied with rotational force from the driving body; and a male threaded portion of the rotating shaft; A tapping unit comprising: a guide member having an inner peripheral portion formed with a female screw portion for screwing the guide member; and a mounting portion provided on the support member and supporting the guide member so as to be movable in an axial direction.