JPH0890341A - Combination deburring device and tap, tap holder, and deburring device and method using them - Google Patents

Abstract

PURPOSE: To remove burr around a tapped hole to be produced by threading work during a threading process without requiring any other new deburring process. CONSTITUTION: A tap holding part in a tap holder is energized to a holder body in the radial direction by dint of a spring, and as a tap to be held by this energized tap holder, it uses such made up with a chamfering part A, an effective thread ridge part B and a deburring guide part C each in order from the tip side. In threading work, it is carried out in a state that a tap center is decentered to the center of a lower hole 59 of a work W by energization and, after threading operation by a normal rotation of the tap, the tap is pirced through the lower hole (a tap hole 61) and subsequently the tap is rotated in reverse, whereby burr 63 is removed by the deburring guide part C forcibly pressed to a peripheral edge of this taped hole 61.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deburring tap and a tap holder for forming a female screw by rotating the tap to penetrate a prepared hole of a work material, a deburring device and a deburring apparatus using the tap. Regarding how to take.

[0002]

2. Description of the Related Art A conventional tap has, as shown in FIG. 9, a biting portion A formed at the tip and an effective thread portion B formed continuously with the biting portion A, The biting portion A bites into the peripheral edge of the pilot hole in the work material, and further, by continuously rotating the tap, the effective thread portion B is used to thread the pilot hole.

On the other hand, the tap holder for holding the tap is
Rigid or a combination holder for tensioning and compressing by the action of the spring 101 in the axial direction S as shown in FIG. 10 is used, and when there is a deviation between the center of the prepared hole and the tap axis, the radial direction R A parallel float type holder with a float amount is used.

The threading process for the pilot hole using the tap and the tap holder as described above is performed as shown in FIG. If the center of the tap 103 is deviated from the lower hole 105a of the work material 105 as shown in FIG. 7A, the center of the tap 103 is moved to the lower hole by the floating mechanism of the tap holder in the radial direction R. In the state of being aligned with the center of the 105a, the effective thread portion B is used to perform thread cutting based on the rotation in the X direction as shown in FIG. After the effective thread portion B penetrates about 2 to 3 threads, the tap 10 is rotated based on the rotation in the Y direction opposite to the above direction as shown in FIG.
3 is pulled out to form a screw hole 105b, and the thread cutting process is completed.

When performing the thread cutting process as described above, the curl-shaped burr 10 is formed on the peripheral edge on the outlet side of the pilot hole 105a through which the tip of the tap 103 passes, as shown in FIG. 11 (c).
7 occurs. For removing the burr 107, a brush, a chamfering drill, a back deburring tool, high-pressure cleaning, or "a method and a tool for deburring an incomplete thread portion" described in JP-A-55-37281 (after thread cutting) Using a tool equipped with a screw-shaped guide part that is screwed into the complete screw part of the screw hole and a cutting edge part that cuts and removes all or part of the incomplete screw part together with the burr)) In addition to the above, it is removed in a separate process, or chamfering is performed in advance on the prepared hole outlet side where burrs are generated to suppress the generation of burrs themselves.

[0006]

As described above, as a countermeasure against the burr on the peripheral edge of the screw hole that occurs after the conventional thread cutting, a work in a step different from the thread cutting is required, which is not the same as the regular thread cutting. The number of processing steps will be increased by one, and the work time for thread cutting will be long,
This is a factor that increases work (manufacturing) costs.

Therefore, an object of the present invention is to remove burrs on the periphery of a screw hole generated by thread cutting without increasing the manufacturing cost.

[0008]

In order to achieve the above object, the present invention is, firstly, as a tap for deburring,
An effective thread portion that enters into a pilot hole penetrating a work material while rotating to form an internal thread, and a tip of the effective thread portion that is formed on the rear end side of the effective thread portion in the entry direction. And a taper portion that has a smaller diameter from the side toward the rear end side and removes a burr generated on the front end side in the approach direction of the effective thread portion in the pilot hole.

Secondly, as a tap holder, a tap holding portion to which rotation of the holder body is transmitted is provided so as to be movable in the radial direction with respect to the holder body, and a tap is provided between the tap holding portion and the holder body. A biasing means for biasing the holding portion in the radial direction is provided.

Thirdly, as a deburring device, an effective thread portion which is inserted into a prepared hole passing through a work material while rotating to form an internal thread, and a rear end side of the effective thread portion in the entry direction. And a burr having a small diameter from the front end side to the rear end side of the effective screw thread portion and each having a taper portion for removing a burr generated on the front end side in the approach direction of the effective screw thread portion in the pilot hole. The tap for combined use and the rotation of the holder main body are transmitted, and the tap holding part for holding the tap for combined deburring is provided so as to be movable in the radial direction with respect to the holder main body. And a tap holder provided with an urging means for urging the tap holding portion in the radial direction.

Fourth, in the first or third configuration,
The taper portion is provided with a blade portion that removes burrs by rotating in a direction opposite to the rotation direction in the thread cutting work by the effective thread portion.

Fifth, in the second or third configuration,
A part of the tap holding portion is housed in the cylindrical portion of the holder body, and a biasing means is interposed between the outer circumference of the housed portion and the inner circumference of the cylindrical portion of the holder body.

Sixth, in the second or third configuration,
The urging means is provided on the central axis of the holder body, and elastic means for elastically pressing the tap holding portion in the axial direction,
The steel ball is elastically pressed by the elastic means and is disposed in the recess on the tap holding portion side at a position eccentric from the central axis.

Seventh, as a deburring method, a tap holding portion for transmitting the rotation of the holder body is provided so as to be movable in the radial direction with respect to the holder body, and the tap holding portion is provided between the tap holding portion and the holder body. An effective thread portion that forms a female screw by rotatingly entering a tap hole that penetrates the work material into a tap holder provided with a biasing means that biases the tap holding portion in the radial direction. Set a deburring tap that is formed on the rear end side of the thread portion in the approach direction and has a taper portion with a small diameter from the front end side to the rear end side of the effective thread portion. When inserting into the pilot hole while rotating it into the pilot hole to form a female screw and penetrating the taper part of the deburring tap with the pilot hole, reversely rotate the deburring tap and pull it out from the pilot hole. , Tapped by the biasing means A tap is also used as a deburring tap together with the holding part to rotate while being biased in the radial direction with respect to the holder body, whereby the taper part cuts and removes the burr formed at the front end side peripheral edge of the pilot hole in the approach direction. .

[0015]

With the tap for deburring and having the first structure, the tap is normally rotated while being radially biased so that the center of the tap is eccentric from the center of the prepared hole of the work material. By performing thread cutting with the effective thread portion, penetrating the effective thread portion and the taper portion into the pilot hole, and then reversing them, burrs that occur at the periphery of the screw hole on the front side in the tap entry direction are generated. Are removed by.

According to the tap holder of the second structure, the tap holding portion is urged in the radial direction with respect to the holder body by the urging means, whereby the tap held by the tap holding portion is placed under the work material. If the above-mentioned tap for deburring is used as the tap that is pressed and held in the radial direction against the hole, the taper part is pressed against the peripheral edge of the screw hole where the burr is generated, making it easy to remove the burr. Done.

According to the deburring device of the third construction or the seventh deburring method, the tap holding portion urged in the radial direction by the urging means to the holder body holds the deburring tap. , In this state, rotate the tap holder and perform thread cutting on the prepared hole of the work material with the effective thread part of the tap for deburring and tap the effective thread part and the taper part to the prepared hole of the work material. Then, the taper portion removes burrs generated at the peripheral edge of the screw hole on the front side in the approach direction of the deburring / tap-insertion tap.

According to the fourth structure, the blade portion in the taper portion removes the burrs formed on the peripheral edge of the screw hole by rotating in the direction opposite to the thread cutting operation.

According to the fifth construction, the tap holding portion is urged radially toward the holder body by the urging means on the outer peripheral side, whereby the tap holding portion is eccentric from the holder body.

According to the sixth configuration, the elastic means provided on the central axis of the holder body elastically presses the steel ball provided in the tap holding portion in the axial direction, whereby the tap holding is performed. The part is eccentric from the central axis of the holder body.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a deburring / combining tap according to an embodiment of the present invention. This tap has a biting part A formed at the tip and an effective thread part B formed continuously with the biting part A, and is opposite to the biting part A with respect to the effective thread part B. The guide portion C for deburring is provided as a taper portion formed on the base side of the side. FIG. 2 is an enlarged view showing the vicinity of the deburring guide portion C of the above tap, and the deburring guide portion C is an effective thread portion B.
Has a blade portion 1 made of a thread having the same pitch P as the pitch P in FIG. 1, and the blade portion 1 has a cutting edge on the front side in the rotation direction opposite to the rotation direction of the tap at the time of thread cutting work by the effective thread portion B. Has been formed. The angle θ as the taper portion of the deburring guide portion C is restricted by the size of the nominal diameter of the screw, the size of the prepared hole, and the like, but smoothing the deburring as much as possible enables smooth deburring work.

FIG. 3 is a side view showing the upper half of the tap holder in cross section. This tap holder includes a body 5 as a holder body fixed to a spindle 3 for rotating the tap holder, and a tap holding portion 7 which is radially movable with respect to the body 5 and holds the tap shown in FIG. Is equipped with.

The body 5 has a shaft portion 11 fixed to the spindle 3 via the half-moon key 9 and an outer cylinder portion 13 fixed to the outer periphery of the cylindrical portion 12 at the tip of the shaft portion 11. A thread is cut on the outer periphery of the shaft portion 11, and a lock nut 15 is screwed into the thread portion. The lock nut 15 adjusts the amount of protrusion of the shaft portion 11 from the end surface of the spindle 3, and is fixed to the shaft portion 11 by a set screw 17. A through hole 19 is formed in the axial portion 11 in the axial direction, and a rod 21 is inserted into the through hole 19 so as to be movable in the axial direction. A female screw 23 is formed at the end of the through hole 19 on the spindle 3 side, and an adjusting screw 25 is screwed into the female screw 23. A spring 27 is arranged at the end of the through hole 19 opposite to the female screw 23, and presses the steel ball 29. By adjusting the adjusting screw 25, the rod 21 moves in the axial direction, and the pressing force of the spring 27 on the steel ball 29 is adjusted.

The tap holding portion 7 includes a cylindrical portion 12 of the shaft portion 11.
To the collet 3 connected via a coupling 31 to the
3, a pair of bearings 35 provided between the collet 33 and the body 5, and a tap chuck 37 for holding the tap shown in FIG.

As shown in detail in FIG. 4, the coupling 31 has a plurality of engaging projections in the circumferential direction on the outer peripheral side of one end of the cylindrical portion 31a and the inner peripheral side of the other end. 31b, 3
1c are formed respectively. The engagement protrusion 31b is formed in the engagement groove 12a formed on the inner periphery of the cylindrical portion 12 of the body 5,
Further, the engaging protrusions 31c engage with the engaging grooves 12b formed on the outer periphery of the collet 33, respectively, whereby the rotation of the body 5 is transmitted to the tap holding portion 7.

The tap chuck 37 is inserted and fixed in the insertion hole 33a of the collet 33, and a screw 39 is formed on the outer periphery of the portion exposed from the collet 33 to the outside. A lock nut 41 is screwed into the screw 39, so that the tap held by the tap chuck 37 is fixed. The lock nut 41 is provided with a female contact portion 41a that is screwed into the screw 39, and a sliding contact portion 41b that is in sliding contact with the outer circumference of the collet 33. A boss portion 43 is formed on the tip side of the outer tubular portion 13 of the body 5, and a dustproof O-ring 45 is provided between the inner peripheral surface 43 a of the boss portion 43 and the outer peripheral surface of the collet 33.

The bearings 35 are provided between the annular protrusion 47 formed on the outer peripheral portion of the collet 33 and the end face of the cylindrical portion 12, and between the protrusion 47 and the boss portion 43 of the outer cylindrical portion 13, respectively. And a ring member 49 fixed to the end surface of the cylindrical portion 12 and the side surface of the boss portion 43, a ring member 51 fixed to both side surfaces of the protrusion 47, and both members 49, 51.
And balls 53 arranged between each other.

A recess 47a is formed on the outer peripheral surface of the protrusion 47 of the collet 33, and the outer cylindrical portion 13 is opposed to the recess 47a.
Recesses 13a are also formed on the inner surface of each of the recesses 47a and 13a.
A coil spring 55 is interposed as a biasing means that biases the coil spring 55 in the radial direction. The coil spring 55 urges the collet 33 in the radial direction, whereby the collet 33
Is eccentric to the axial center of the body 5, and in this state, as shown in FIG. 4, a gap t (about 1 mm) is formed between the inner peripheral surface 43a of the boss 43 and the outer peripheral surface of the collet 33. To be done.

A chamfer 33b is formed at the opening end of the collet 33 on the body 5 side of the insertion hole 33a, and the steel ball 29 is pressed against the opening end by the spring 27. As a result, the collet 33 is movable in the axial direction with respect to the body 5, but the play in the axial direction is suppressed.

FIG. 5 is a sectional view taken along the line D--D in FIG. 4, but a plate spring 57 may be used as shown in FIG. 6 instead of the coil spring 55 shown here.

Next, a threading process using the above-described deburring tap and tap holder will be described with reference to FIG. When the tap shown in FIG. 1 is attached to the tap holder of FIG. 3, the collet 33 is urged in the radial direction with respect to the body 5 by the coil spring 55. That is, it is in a state of being eccentric with respect to the central axis of the spindle 3. Normally, since the central axis of the spindle 3 is substantially coincident with the central axis of the prepared hole 59 of the work material W, the central axis of the tap with respect to the central axis of the prepared hole 59 of the work material W is shown in FIG. It is in an eccentric state as in a).

In this state, as shown in FIG. 7 (a), the tap held by the tap holder is brought close to the work W as the spindle 3 rotates and descends in the X direction, and the chamfered portion A at the tip end is reached. Contacting the peripheral edge of the prepared hole 59, the collet 33, that is, the center of the tap moves radially so as to be aligned with the center of the body 5 against the biasing force of the spring 55. At this time, the force acting on the tap in the axial direction is absorbed by the collet 33 moving in the axial direction against the urging force of the spring 27. When the tap further rotates in the X direction in this state, the biting part A bites the peripheral edge of the pilot hole 59, and as shown in FIG. Threaded, screw hole 6
1 will be formed.

Even after the threaded hole 61 is formed and the biting part A of the tap projects from the threaded hole 61, the tap is further rotated in the same direction, and as shown in FIG. The part B is passed through the screw hole 61. At this time, a burr 63 is generated on the peripheral edge of the tapped hole in the screw hole 61 on the outlet side. Further, in the process in which the deburring guide portion C follows the effective screw thread portion B and projects downward from the screw hole 61 in the drawing to penetrate, the tap causes the deburring guide portion C to be urged by the coil spring 55. When pressed against one side of the work material W, the center axis of the collet 33 and the screw hole 6
It returns to the eccentric state from the center of 1.

In this state, the blade 1 of the deburring guide portion C is moved by rotating the tap in the Y direction opposite to the conventional one and moving it in the direction of approaching the screw hole 61 (upward in the figure). By being pressed against the peripheral edge of the screw hole 61, and by rotating the tap in this pressed state, as shown in FIG.
As shown in (d), the burr 63 is cut by the blade portion 1 and removed.

When the tap is further continuously rotated in the Y direction even after the burr 63 is removed, the tap moves upward in the drawing while the effective thread portion B is guided by the screw hole 61.
As shown in FIG. 7A, the screw hole 61 is pulled out.

In the thread cutting as described above,
The burr 63 generated by the thread cutting work can be removed during the thread cutting process, which eliminates the need for a new deburring process, shortens the overall work time in the thread cutting process, and lowers the work (manufacturing) cost. Become. Further, such a thread cutting process capable of removing burrs is highly versatile because the taps and the tap holders are simply changed from the conventional ones, and other equipment can be used as they are.

FIG. 8 shows a tap holder according to another embodiment of the present invention. This embodiment shows another example of the mechanism for urging the collet 33 in the tap holder in the radial direction. This tap holder has an insertion hole 3 for the collet 33.
3a does not pass through the left end portion of the insertion hole 33a.
A steel ball receiving portion 65 having a V-shaped cross section for receiving the steel ball 29 is formed on the end surface of the collet 33 on the side opposite to a at a position slightly eccentric with respect to the central axis of the insertion hole 33a. Steel ball 29
However, the collet 33 is eccentric to the body 5 in the radial direction by being pressed against the steel ball receiving portion 65 as a recess by the spring 27 that constitutes an elastic means.
Therefore, the spring 27, the steel ball 29, and the steel ball receiving portion 65 form the biasing means 67.

Even when the tap holder of FIG. 8 is used to perform thread cutting with the tap of FIG. 1, the deburring work can be performed in the same step as the thread cutting, similar to that shown in FIG.

[0040]

As described above, according to the first or fourth aspect of the invention, the center of the deburring tap is urged in the radial direction so as to be eccentric from the center of the pilot hole. After tapping the screw by turning the tap forward, by reversing it, the burrs on the periphery of the screw hole can be removed by the taper part, so deburring work can be performed during the thread cutting process, and a new deburring process is not required. Therefore, the manufacturing cost can be reduced.

According to the second, fifth or sixth invention, since the tap holding portion is urged in the radial direction by the urging means,
If the above-described tap for deburring is set in the tap holding portion, the taper portion is pressed against the peripheral portion of the screw hole where the burr is generated, and the burr can be easily removed.

According to the third or seventh aspect of the invention, the tap holding portion is urged in the radial direction with respect to the holder body by the urging means, so that the tap held by the tap holding portion is moved to the holder body. On the contrary, the taper is pressed against the periphery of the screw hole by reversing the tap after the thread cutting work in this state, the burr generated on the periphery of the screw hole can be easily removed, and the deburring work in the thread cutting process can be performed. This makes it possible to eliminate the need for a new deburring step and reduce the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a side view of a deburring / combining tap according to an embodiment of the present invention.

FIG. 2 is an enlarged explanatory view of the vicinity of a taper portion in the deburring tap shown in FIG.

FIG. 3 is a side view showing a cross section of a part of the tap holder according to the embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a main part of FIG.

5 is a sectional view taken along line DD of FIG.

6 is a sectional view corresponding to FIG. 5 when the coil spring in the tap holder of FIG. 4 is replaced with a plate spring.

7 is an operation explanatory view of thread cutting using the tap of FIG. 1 and the tap holder of FIG.

FIG. 8 is a side view showing a cross section of a part of a tap holder showing another embodiment of the present invention.

FIG. 9 is a side view of a conventional tap.

FIG. 10 is a side view showing a part of a conventional tap holder in cross section.

FIG. 11 is an operation explanatory view of thread cutting using a conventional tap and a tap holder.

[Explanation of symbols]

 A Effective thread portion C Deburring guide portion (tapered portion) W Work material 1 Blade portion 5 Body (holder body) 7 Tap holding portion 27 Spring (elastic means) 29 Steel ball 33b Steel ball receiving portion (concave portion) 55 Coil spring (biasing means) 59 Lower hole 61 Screw hole 63 Burr 67 Biasing means

Claims (7)

[Claims] 1. An effective screw thread portion which is inserted into a prepared hole penetrating a work material while rotating to form an internal thread, and an effective screw thread portion which is formed at a rear end side of the effective screw thread portion in the approach direction. Deburring, characterized in that the taper portion has a small diameter from the front end side to the rear end side of the screw thread portion and removes a burr generated on the front end side in the approach direction of the effective screw thread portion in the pilot hole. Combined tap. 2. A tap holding portion to which rotation of the holder main body is transmitted is provided so as to be movable in the radial direction with respect to the holder main body, and the tap holding portion is radially provided between the tap holding portion and the holder main body. A tap holder provided with a biasing means for biasing. 3. An effective screw thread portion that enters into a pilot hole penetrating a work material while rotating to form an internal thread, and the effective screw thread portion is formed on the rear end side of the effective screw thread portion in the approach direction. A deburring tap having a small diameter from the front end side to the rear end side of the crest portion and each having a taper portion for removing a burr generated on the front end side in the entry direction of the effective screw thread portion in the pilot hole, and a holder body. Rotation is transmitted, a tap holding portion for holding the tap for deburring is provided so as to be movable in the radial direction with respect to the holder main body, and the tap holding portion is provided between the tap holding portion and the holder main body. A deburring device comprising: a tap holder provided with a biasing means for biasing in a direction. 4. The tap for deburring and combined use according to claim 1, wherein the taper portion is provided with a blade portion for removing burrs by rotating in a direction opposite to a rotating direction in a thread cutting operation by the effective thread portion. Alternatively, the deburring device according to claim 3. 5. The tap holding part is partly housed in the cylindrical part of the holder main body, and a biasing means is interposed between the outer circumference of the part of the tap holding part and the inner circumference of the cylindrical part of the holder main body. The tap holder according to claim 2 or the deburring device according to claim 3, wherein the tap holder is mounted. 6. The biasing means is provided on the central axis of the holder main body and elastically presses elastically in the axial direction against the tap holding portion, and the elastic means presses elastically to the center. 3. A steel ball arranged in a recess on the side of the tap holding portion at a position eccentric from the shaft.
The tap holder according to claim 3 or the deburring device according to claim 3. 7. A tap holder for transmitting rotation of the holder body is provided so as to be movable in the radial direction with respect to the holder body, and the tap holder is radially provided between the tap holder and the holder body. To the tap holder provided with the biasing means for biasing the work piece into the tapped hole penetrating the work material while rotating to form an internal thread, and the entry direction of the effective thread portion. Set a deburring tap that is formed on the rear end side and that has a taper part with a small diameter from the front end side of the effective thread part toward the rear end side, and rotate this deburring tap for the pilot hole. While tapping into the internal hole while forming the internal thread and penetrating the taper part of the deburring / tapping tap into the pilot hole, tap the urging means when the deburring / tapping tap is reversely rotated and pulled out from the pilot hole. A deburring unit that works together with the holding unit. Deburring method, characterized in that the taper portion is rotated while being biased in the radial direction with respect to the holder body, so that the taper portion cuts and removes the burr formed on the peripheral edge of the front end side of the entry direction. .