JPH09155639A - Tap holder and tap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an increased service life for a tap without lowering machining precision for a screw and further to reduce a labor to remove chips. SOLUTION: An oil feed hole 20 to feed oil the upper end of the deep part of an insertion hole 18 is formed in the lower body part 16 of a tap holder A1, oil delivery holes 38a, 38b, 40a, and 40b are formed in the lower end of the lower part body part 16, and oil feed holes 30a and 30b to feed oil to the oil delivery holes 38a and 38b are formed. An oil feed hole is formed on the opposite side to the oil feed holes 30a and 30b. A tap is securely inserted in an insertion hole 18. A tap having a through-hole continued from a base end part to a tip part along an axis is used as the tap. Oil fed through the oil feed holes 54 and 56 of a collar part 50 is delivered through the oil delivery hole 38a and also delivered from the tip of the tap and fed in a lower hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tap holder for holding a tap and a tap.

[0002]

2. Description of the Related Art Conventionally, a tap is used to cut a female screw in a prepared hole drilled. That is, a predetermined tap is attached to the tap holder connected to the rotary drive source, and female screw forming processing is performed.

[0003]

However, when the internal thread groove forming process is performed by the tap, chips are generated. And
When this chip is returned from the tap, that is, when it is rotating in the rotation direction opposite to the rotation direction during processing, the chip is caught between the tap and the processed hole, and the processing accuracy is high. There was a problem of lowering. Further, since the chips are caught as described above, the life of the tap is shortened.
Further, there is a problem that the holes must be cleaned because the cutting chips remain in the processed holes.

Therefore, an object of the present invention is to provide a tap holder and a tap which can extend the life of the tap without reducing the machining accuracy of the screw and can reduce the time and effort required for removing chips. To do.

[0005]

The present invention was made to solve the above problems, and firstly, a tap holder for holding a tap, which is provided with a lubricant from the outside. It is characterized by having a supply hole for supplying and a discharge hole for discharging the lubricant supplied from the supply hole. According to the tap holder of the first configuration, by supplying a lubricant such as oil to the prepared hole for forming the thread groove, the lubricant is sequentially discharged from the prepared hole, and the lubricant and the cutting chips are generated. It is discharged to the outside of the pilot hole. Therefore, defects due to chipping of chips are eliminated, and the life of the tap itself is improved. Further, the time required for removing the chips after processing can be shortened.

Secondly, in the above-mentioned first construction, the tap holder is provided with a substantially cylindrical tubular portion having an insertion hole through which the shaft portion of the tap is inserted, and the tap holder discharges at the lower end of the tubular portion. It is characterized in that a hole is provided. In the tap holder having the second structure, the threaded portion is formed by inserting the shaft portion of the tap into the insertion hole provided in the tubular portion. According to the tap holder having this configuration, since the discharge hole is provided at the lower end of the tubular portion, the lubricant is supplied to the pilot hole by making the position of the discharge hole correspond to the groove portion of the screw portion of the tap. To be done. Therefore, defects due to chipping of chips are eliminated, and the life of the tap itself is improved. Further, the time required for removing the chips after processing can be shortened. Thirdly, in the second configuration, the pair of discharge holes are provided at symmetrical positions with respect to the axial center of the tubular portion. According to the tap holder of the third configuration, in the tap having the four groove portions on the screw portion, the lubricant such as oil can be supplied from the two groove portions and the lubricant can be discharged from the other two groove portions. Can be circulated efficiently, and the efficiency of discharging chips is improved.

Fourthly, in the above-mentioned third structure, a rectangular cross-section having a substantially square cross-section at the base end of the tap is fitted in the inner part of the insertion hole of the tap holder. It has a rotation preventing portion, and the pair of discharge holes are provided at positions equidistant from the substantially quadrangular corners of the rotation preventing portion. According to the tap holder of the fourth configuration, in the tap having four groove portions of the screw portion,
Since the groove part of the screw part corresponds to each quadrangular side of the square part of the normal tap, the discharge hole can be surely corresponded to the groove part, and the discharged lubricant can be surely lowered through the groove part. Can be supplied to the holes. Fifth, the third
Alternatively, in the fourth configuration, a pair of ejection holes further provided at a lower end of the tubular portion at a position deviated from the pair of ejection holes by a predetermined angle, with the axis of the tubular portion as a center. The discharge holes for discharging the lubricant are provided in the discharge holes provided at symmetrical positions. According to the tap holder of the fifth configuration, the pair of discharge holes are further provided at the positions deviated by the predetermined angle. It is possible to discharge the lubricant such as the above and supply it to the prepared hole through the groove.

Sixthly, in any one of the first to fifth configurations described above, a plurality of discharge holes are provided, and any discharge hole in the plurality of discharge holes can be closed. It is characterized by In the tap holder having the sixth configuration, unnecessary discharge holes are closed out of the two pairs of discharge holes so that lubricant such as oil is not discharged. That is,
It is possible to prevent the lubricant from being discharged by closing unnecessary discharge holes such as the discharged lubricant hitting the blade of the tap. Seventhly, in any of the above-described first to sixth configurations, the tap holder further includes a supply hole for supplying a lubricant from the outside and an upper end of a deep part of an insertion hole for inserting a shaft portion of the tap. And a passage portion for feeding the lubricant. In the tap holder having the seventh structure, a tap having a through hole is used. That is, a tap having a through hole extending from the base end portion to the tip end portion along the axis is inserted into the insertion hole. Then, when a lubricant such as oil is supplied from the supply hole, it is sent to the upper end of the inner part of the insertion hole through the passage.
After that, the lubricant enters through the through hole at the base end portion of the tap and is discharged from the tip end portion. As a result, a lubricant such as oil is supplied to the prepared hole to discharge the chips. And eighthly,
In the first or second configuration, the number of discharge holes is smaller than the number of groove portions provided in the screw portion of the tap attached to the tap holder.
As a result, a lubricant such as oil is supplied from a part of the plurality of grooves, and the lubricant is discharged from the remaining grooves,
The chips can be efficiently discharged.

Ninth, a tap holder for holding a tap, comprising a holder body, a collar, and
And a retaining ring portion, and the holder main body portion has a substantially cylindrical tubular portion having an insertion hole through which the shaft portion of the tap is inserted, the first supply hole provided on the side surface portion, and the first supply hole. No. 1 has a passage portion for sending the lubricant supplied from the supply hole to the upper end of the inner portion of the insertion hole, and a second supply hole provided in the side surface portion, and a discharge hole connected from the second supply hole via the passage portion. At this point, there are two pairs of discharge holes provided at the lower end of the tubular portion, and there is a hole portion for fixing the tap inserted in the insertion hole, and the collar portion is the tubular portion. And a second hole portion for supplying a lubricant to the second supply hole and a side surface portion having a through hole for inserting a lubricant into the first supply hole. The snap ring portion has a through hole for inserting the tubular portion and a hole portion for fixing the tap. It is characterized in. In the tap holder having the ninth structure, the holder main body portion, the collar portion and the retaining ring portion are assembled. That is, the tubular portion of the holder body is inserted into the collar portion, and then the tubular portion is inserted into the retaining ring portion. Then, the hole of the retaining ring portion and the hole of the collar portion are aligned with each other, and a screw or the like is inserted therethrough to fix the retaining ring portion and the collar portion to the holder main body portion. After that, a tap having a through hole inside is inserted into the insertion hole of the holder body, and then the tap is fixed by a screw fixing the retaining ring. After that, a thread groove forming process is performed on the prepared hole previously formed by the tap, and at this time, a lubricant such as oil is supplied to the prepared hole. That is, an oil supply pipe or the like is connected to the first hole of the collar section to supply a lubricant such as oil to the first hole.
Then, the lubricant is sent to the first supply hole of the holder body,
Then, it is sent to the upper end of the deep part of the insertion hole through the passage part. Then, the lubricant is sent to the through hole of the tap and discharged from the tip of the tap. Also, an oil supply pipe or the like is connected to the second hole of the collar portion to supply a lubricant such as oil to the second hole. Then, the lubricant is sent to the second supply hole of the holder main body, and then sent to the discharge hole provided at the lower end of the tubular portion through the passage, and the lubricant is discharged from this discharge hole. Since there are two pairs of discharge holes, the lubricant is discharged from the discharge holes at the positions corresponding to the groove of the tap when the tap is attached, and the discharge holes not corresponding to the positions of the groove are closed. .. Therefore, by supplying a lubricant such as oil to the prepared hole where the screw forming process is performed, the lubricant is sequentially discharged from the prepared hole, and the chips are discharged to the outside of the prepared hole together with the lubricant. Therefore, defects caused by chipping of chips are improved, the life of the tap itself is improved, and the time required for removing chips after processing can be shortened. Tenth, in any one of the first to ninth configurations, the lubricant is oil.

The eleventh feature is a tap, which is characterized by having a through hole extending from the base end portion to the tip end portion along the axis. In the tap having this structure, a lubricant such as oil is supplied from the base end side of the through hole and the lubricant is discharged from the tip of the tap during processing by the tap. Then, since the lubricant is supplied to the prepared hole, the chips are discharged to the outside of the prepared hole together with the lubricant.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. A tap holder A1 according to the present invention is configured as shown in FIG. 1 and has a holder main body portion 10, a collar portion 50, and a retaining ring portion 70. This tap holder A1 is made of iron.

As shown in FIG. 1, the holder main body 10 is composed of an upper main body 12, an intermediate main body 14, and a lower main body 16 as a cylindrical portion.
2, the middle body portion 14 and the lower body portion 16 are integrally formed. Here, the upper main body 12 has a substantially columnar shape, and its tip is slightly pointed. Further, the middle body portion 14 also has a substantially cylindrical shape, and is formed to have a larger diameter than the upper body portion 12 and the lower body portion 16.

Further, the lower body portion 16 also has a substantially cylindrical outer shape, and an insertion hole 18 for inserting the tap B (see FIG. 3) in the longitudinal direction is provided therein, and the lower portion of the lower body portion 16 is provided. The insertion hole 18 is opened in the. As shown in FIG. 5, the insertion hole 18 is provided with an anti-rotation portion 18b and an anti-rotation portion 18b, which are provided at an upper end portion and have a substantially rectangular cross section.
a cylindrical portion 18a having a substantially circular cross section provided below b.
Divided into The rotation stopping portion 18b is provided to prevent the tap B from rotating.

In addition, as shown in FIGS. 1, 5, and 6, the upper portion of the side surface of the lower main body 16 has a supply hole and a first hole.
Oil supply holes 20 and 22 are provided as supply holes.
The oil supply hole 20 and the oil supply hole 22 are provided at symmetrical positions in the radial direction of the lower body portion 16. Inside the oil supply hole 20 and the oil supply hole 22, as shown in FIGS.
An oil passage 24 is provided as a passage portion. The oil passage 24 has a horizontal path 25 connecting the oil supply hole 20 and the oil supply hole 22 and a vertical path 26 extending vertically from the horizontal path 25 to the insertion hole 18. It opens at the upper end of. The oil supply holes 20 and 22 are formed to be slightly larger than the width of the horizontal passage 25, as shown in FIG.

Further, oil supply holes 30a and 30b as a supply hole and a second supply hole are provided at the same height at the lower part of the side surface portion. That is, the oil supply hole 30a is provided below the oil supply hole 20, and the oil supply hole 30b is provided next to the oil supply hole 30a. A pair of oil supply holes are provided at radially symmetrical positions of the pair of oil supply holes 30a and 30b in the lower body portion 16. That is, the oil supply holes 32a as the supply holes and the second oil supply holes are provided at the symmetrical positions of the oil supply holes 30a (see FIGS. 5 and 7), and further, at the symmetrical positions of the oil supply holes 30b. An oil supply hole 32b as a second oil supply hole is provided (see FIG. 7).

Further, at the lower end of the lower body portion 16,
Four oil discharge holes are provided. That is, the oil supply hole 3
The oil discharge hole 38a communicating with the oil supply hole 30a is provided at the lower end of the oil supply hole 30a, and the oil discharge hole 3b communicated with the oil supply hole 30b is provided at the lower end of the oil supply hole 30b.
8b is provided. Further, the lower end of the oil supply hole 32a in the lower direction is provided with an oil discharge hole 40a communicating with the oil supply hole 32a, and the lower end of the oil supply hole 32b in the lower direction is communicated with the oil supply hole 32b. An oil discharge hole 40b is provided. Further, as shown in FIG. 2, the formation positions of the oil discharge holes 38a and 40a are positions equidistant from the corners of the quadrangular shape of the rotation stopping part 18b.
This is formed according to the position where the groove portion 84 is normally provided in the standard of the tap B. Further, the formation positions of the oil discharge holes 38b and 40b are the same as those of the oil discharge hole 38 described above.
It is a position deviated from a and 38b by approximately 30 to 40 degrees. This is because the oil discharge holes 38b and 40b correspond to that the groove portion 84 of the tap B may be provided at a position slightly deviated from the standard depending on the type of tap. Further, the oil discharge holes 38a, 38b, 40a, 4
A female thread groove is formed in 0b so that the screws 42 and 44 can be attached. The oil discharge holes 38a, 3
8b, 40a, 40b function as discharge holes.

Further, as shown in FIGS. 5 and 7, an oil passage 34a having a substantially hook-shaped cross section is provided between the oil supply hole 30a and the oil discharge hole 38a. An oil passage 34b having a substantially hook-shaped cross section is also provided between the discharge holes 38b. Furthermore, the oil supply hole 32a and the oil discharge hole 4
As shown in FIGS. 5 and 7, an oil passage 36a having a substantially hook-shaped cross section is provided between 0a, and similarly, the oil supply hole 32b is provided.
Between the oil discharge hole 40b and the oil passage 3 having a hook shape in section
6b is provided. These oil passages 34a, 34b, 3
6a and 36b function as passage portions. A hole 46 is provided in the lower portion of the lower body portion 16. The hole 46 is for inserting a screw 76 for fixing the tap.

Next, the collar portion 50 has a substantially hexagonal bolt shape as a whole, has six side surface portions on its side surfaces, and has a through hole 52 provided therein. The collar portion 50 functions as a collar. The collar portion 50 has a nut-like appearance, but the through hole 52 has no thread groove. The diameter of the through hole 52 is such that the lower body 16 can be inserted therethrough.
Is formed to have substantially the same diameter. Further, an oil supply hole 54 as a first hole for supplying oil and an oil supply hole 56 as a second hole are provided vertically. Female screw grooves are formed in the oil supply holes 54 and 56 in order to connect an oil supply pipe (not shown) from the outside. Further, inside the through hole 52 of the collar portion 50, two groove portions are formed along the inner peripheral direction. That is, as shown in FIGS. 5 and 6, the groove portion 58 is formed at the position where the oil supply holes 20 and 22 are present at the time of assembly, and the oil supply holes 30a, 30b, and 3 are formed.
As shown in FIGS. 5 and 7, groove portions 60 are formed at the positions where 2a and 32b are present.

Next, the retaining ring portion 70 has a substantially ring shape, and a through hole 72 is formed inside. The diameter of the through hole 72 is formed to be substantially the same as the diameter of the through hole 52 of the collar portion 50. Further, on the side surface of the retaining ring portion 70,
A hole portion 74 is formed, and a female screw groove for fitting a screw 76 is provided in the hole portion 74.

Next, the tap B according to the present invention will be described. As shown in FIG. 3, tap B has a threaded portion 80.
And a shaft portion 86, and the screw portion 80 has four blade portions 82 and four groove portions 84 formed at equal intervals on the outer peripheral portion. Further, the shaft portion 86 is composed of a shaft main body portion 88 continuous from the screw portion 80 and a square portion 90 continuous from the shaft main body portion 88, and the shaft main body portion 88 has a substantially columnar shape. The square portion 90 is formed in a substantially square cross section. Further, a through hole 92 is formed at a center position in the longitudinal direction of the tap B, and the through hole 92 is formed in the screw portion 8
It is open at the lower end portion of 0 and the upper end portion of the square portion 90.

Next, the usage state of the tap holder A1 and the tap B having the above-mentioned structure will be described. First, the tap holder A1 is assembled. That is, the lower body 16 is inserted into the collar 50, and then the lower body 16 is inserted into the retaining ring 70. Then, the tap B is inserted into the insertion hole 18 of the lower main body portion 16 of the tap holder A1, the square portion 90 of the tap B is inserted into the rotation stop portion 18b of the insertion hole 18 of the tap holder A1, and the tap B is rotated. Try not to. Then, the screw 76 is inserted into the hole portion 74 of the retaining ring portion 70 and the hole portion 46 of the lower body portion 16 to fix the tap B. The oil discharge holes 38a, 38b, 40a, 4
0b, it is desirable to provide screws 42 and 44 in the oil discharge holes other than the oil discharge hole corresponding to the position of the groove portion 84 of the tap B to close the oil discharge hole. For example, with the tap B attached, as shown in FIG.
When 0a corresponds to the position of the groove portion 84, the other oil discharge holes 38b and 40b are closed with the screws 42 and 44.

When the tap B is completely attached, an oil supply pipe (not shown) is attached to the oil supply holes 54 and 56 of the collar portion 50. When the attachment of the oil supply pipe is completed, the tap holder A1 and the tap B are set above the workpiece, and the machining with the tap B is started. That is, the female screw groove forming process is performed on the prepared hole. At the time of processing, oil is supplied from an oil supply pipe attached to the oil supply hole 54. Then, the oil passes through the groove portion 58 of the collar portion 50, the oil passage 24 of the holder body portion 10, and the through hole 92 at the upper end of the tap B.
It enters and is discharged from the lower end side of the tap B. Also,
Oil is also supplied from the oil supply pipe attached to the oil supply hole 56. Since the collar portion 50 can freely rotate with respect to the holder body portion 10, the oil supply holes 54 and 56 can be oriented in a desired direction.

Then, the oil is discharged from the oil discharge holes 38a and 40a through the groove portion 60 of the collar portion 50 and the oil passages 34a and 36a of the holder main body portion 10. This oil discharge hole 38a,
Since 40a corresponds to the position of the groove portion 84 of the tap B, the blade portion 82 or the like of the tap B does not interfere. Here, in the groove portion 84, the one corresponding to the oil discharge holes 38a and 40a in the attached state of the tap B is provided in the groove portion 84.
a and the other groove portion is a groove portion 84b.

Then, the oil discharged from the through hole 92 of the tap B and the oil discharged from the oil discharge holes 38a and 40a are supplied to the prepared hole. Then, the excess oil in the prepared hole is discharged from the groove portion 84b which does not correspond to the oil discharge holes 38a and 40a. That is, tap B
Focusing on the groove portion 84, the groove portion 84a is the oil supply side and the groove portion 84b is the oil discharge side. Therefore, the oil is once supplied to the prepared hole and then discharged, and the oil circulates efficiently, so that the chips are efficiently discharged together with the oil. Therefore, even when the tapping is returned after the screw processing is completed, the chips are discharged, so that the defect due to the chipping of the chips is eliminated, and the life of the tap B itself is also improved. Further, the time required for removing the chips after processing can be shortened.

Depending on the tap, the number of grooves may be other than four as described above. In that case, oil is discharged from the oil discharge holes corresponding to the grooves, and at least one groove is It is necessary not to supply oil from the groove for oil discharge. In that case, it is desirable that the number of grooves on the oil supply side is the same as the number of grooves on the oil discharge side. However, since oil is also supplied from the through hole 92 of the tap B, the number of grooves on the oil discharge side may be larger.

Further, in the above description, the tap B provided with the through hole 92 is used, but a normal tap having no through hole may be used. In that case, it is not necessary to supply oil from the oil supply hole 54 of the collar portion 50. Also in this case, the oil supplied from the oil supply hole 56 is discharged from the oil discharge holes 38a, 40a and is supplied to the prepared hole, and the oil discharge hole 38a of the tap,
Since chips are discharged from the groove portion that does not correspond to 40a, chips can be discharged efficiently.

Next, the tap holder in the second embodiment will be described. The tap holder A2 of the second embodiment has substantially the same configuration as the tap holder A1 of the first embodiment, but does not have a function of supplying oil to the through hole provided in the tap. That is, as shown in FIG. 8, in the holder main body 10 of the tap holder A2, the oil supply holes 30a and 30b and the oil discharge holes 38a, 38b and 40a,
40b is provided and a hole 46 is provided, but the oil supply holes 20 and 22 and the oil passage 2 provided in the first embodiment are provided.
4 is not provided. Further, although the collar portion 50 is also provided with the oil supply hole 56, the oil supply hole 54 provided in the first embodiment is not provided.

Next, a usage state of the tap holder A2 having the above structure will be described. First, the tap holder A2 is assembled. That is, the lower body 16 is inserted into the collar 50, and then the lower body 16 is inserted into the retaining ring 70. Then, the tap is inserted into the insertion hole 18 of the lower main body portion 16 of the tap holder A2, and the square portion at the base end of the tap is inserted into the rotation stop portion 18b at the deepest position of the insertion hole 18 of the tap holder A2 to make the tap. Do not rotate. The tap used for the tap holder A2 is a normal tap, and unlike the tap B, no through hole is provided. Then, the screw 76 is inserted into the hole portion 74 of the retaining ring portion 70 and the hole portion 46 of the lower body portion 16 to fix the tap B. In addition, the oil discharge holes 38a, 38b, 40a,
It is desirable that the oil discharge holes other than the oil discharge hole corresponding to the position of the groove portion of the tap are provided with screws 42 and 44 to close the oil discharge hole. In this embodiment, the oil discharge holes 38b and 40b are closed.

After the installation of the tap is completed, an oil supply pipe (not shown) is installed in the oil supply hole 56 of the collar portion 50. When the attachment of the oil supply pipe is completed, the tap holder A2 and the tap B are set above the workpiece, and the machining by the tap is started. That is, the female screw groove forming process is performed on the prepared hole. At the time of processing, oil is also supplied from an oil supply pipe attached to the oil supply hole 56. Then, the oil passes through the groove portion provided on the inner periphery of the collar portion 50, the oil passage 34a of the holder main body portion 10, and the like, and the oil discharge hole 38a,
It is discharged from 40a. These oil discharge holes 38a, 40a
Corresponds to the position of the tap groove, so tap B
The blade portion 82 and the like do not get in the way.

Then, the oil discharged from the oil discharge holes 38a, 40a is supplied to the prepared hole. Then, the excess oil in the prepared hole is used as the oil discharge holes 38a, 4a.
0a is discharged from the groove part of the tap which does not correspond. Therefore, since the oil is once supplied to the prepared hole and then discharged, the chips are efficiently discharged. Therefore, even when the tapping is returned after the screw processing is completed, the chips are discharged, so the defect due to the chip clogging is eliminated,
The life of the tap B itself is also improved. Further, the time required for removing the chips after processing can be shortened.

Depending on the tap, the number of groove portions may be other than four as described above. In that case, as in the case of the first embodiment, the groove portion corresponds to the oil discharge hole. It is necessary to discharge the oil and not supply the oil to the at least one groove portion for discharging the oil. In that case, in order to balance the oil supply amount and the oil discharge amount, it is desirable that the number of groove portions on the oil supply side and the number of groove portions on the oil discharge side be the same.

In the above description, the tap holder for holding the tap has been described, but the invention can be applied to holders for other cutting tools. For example, in a reamer holder that holds a reamer, an oil discharge hole is provided at the lower end of a tubular part that passes through the shaft of the reamer, and the life of the reamer is improved by discharging oil toward the prepared hole for finishing. Can be planned. That is, since the reamer is also provided with the groove portion, the oil can be reliably supplied to the prepared hole by associating the oil discharge hole with the groove portion. Specifically, since the reamer is also formed in a symmetrical shape about the shaft center, it is conceivable to provide the oil discharge holes at symmetrical positions about the shaft center of the tubular portion. Further, by providing a pair of oil discharge holes symmetrically at a position further offset by a predetermined angle in the pair of oil discharge holes, it is possible to deal with a reamer having a groove portion slightly displaced. In addition, especially when finishing so-called blind holes, the number of oil discharge holes that is less than the number of grooves in the reamer is provided in the cylindrical portion of the holder, and oil is supplied from the grooves corresponding to the oil discharge holes. And then
By discharging the oil from the groove portion not corresponding to the oil discharge hole, the oil can be circulated and the chips can be discharged efficiently.
Since a reamer usually has 6 blades and 6 grooves,
Oil is supplied from a pair of symmetrical groove portions and discharged from other groove portions. Furthermore, a reamer provided with an oil hole connected from the base end portion to the tip end portion along the axis of the reamer is used, and the holder is the same as the tap holder A1 described above.
Oil may be supplied to the oil hole at the base end so that the oil can be supplied also from the tip of the reamer. Further, in each of the above-described first and second embodiments and the like, oil has been described as an example of the lubricant to be discharged, but other liquids or the like may be used. That is, any lubricant other than oil may be used as long as it has a lubricating function.

[0033]

According to the tap holder of the first aspect of the present invention, by supplying a lubricant such as oil to the prepared hole for forming the thread groove, the lubricant is discharged from the prepared hole one after another. Then, the chips are discharged to the outside of the prepared hole together with the lubricant, so that the defects caused by the chips clogging are eliminated and the life of the tap itself is also improved. Further, the time required for removing the chips after processing can be shortened. Further, according to the tap holder of the second aspect, since the discharge hole is provided at the lower end of the tubular portion, the prepared hole is formed by making the position of the discharge hole correspond to the groove portion of the screw portion of the tap. Lubricant is supplied to the device, which eliminates defects caused by chipping of chips and improves the life of the tap itself. Further, the time required for removing the chips after processing can be shortened.

Further, according to the tap holder of the third aspect, in the tap having four groove portions in the screw portion,
Since the lubricant can be supplied from one groove portion and the lubricant can be discharged from the other two groove portions, the lubricant can be efficiently circulated and the chip discharging efficiency is improved. Further, according to the tap holder of claim 4, in a tap having four groove portions of the screw portion, the groove portion of the screw portion corresponds to each quadrangular side of the square portion of the normal tap. The discharge hole can be surely made to correspond to the groove portion, and the discharged lubricant can be surely supplied to the prepared hole through the groove portion.

Also. According to the tap holder of claim 5, since the pair of discharge holes are further provided at the positions deviated by a predetermined angle, even if the tap in which the groove portion of the screw part is slightly deviated depending on the tap standard, oil It is possible to discharge the lubricant such as, and supply it to the prepared hole through the groove. Further, according to the tap holder of the sixth aspect, it is possible to prevent the lubricant from being discharged by closing unnecessary discharge holes such as the discharged lubricant hitting the blade portion of the tap. Further, according to the tap holder of claim 7, the lubricant is sent to the upper end of the deep part of the insertion hole of the tap, the lubricant enters from the through hole of the base end part of the tap, and is discharged from the tip part. The lubricant can be supplied to the prepared hole to discharge the chips.

Further, according to the tap holder of the eighth aspect, the lubricant such as oil is supplied from a part of the plurality of groove portions of the tap and the lubricant is discharged from the remaining groove portions. The powder can be discharged efficiently. Also,
According to the tap holder of claim 9, by supplying a lubricant such as oil to the prepared hole for thread forming processing, the lubricant is discharged one after another from the prepared hole, and the lubricant is discharged together with the cutting chips. Since it is discharged to the outside of the hole, defects caused by chipping of chips are eliminated, the life of the tap itself is improved, and the time required for removing chips after processing can be shortened. Further, according to the tap of the eleventh aspect, since the lubricant can be discharged from the tip of the tap, the lubricant is supplied to the prepared hole, and the chips together with the lubricant are discharged to the outside of the prepared hole. be able to.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a tap holder according to a first embodiment of the present invention.

FIG. 2 is a bottom view showing the configuration of the tap holder according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a tap holder and a tap according to the first embodiment of the present invention.

FIG. 4 is a bottom view of the tap holder to which the tap is attached.

FIG. 5 is a vertical sectional view of a tap holder to which a tap is attached.

FIG. 6 is a sectional view taken along line XX in FIG. 5;

7 is a cross-sectional view taken along line YY in FIG.

FIG. 8 is an exploded perspective view showing a structure of a tap holder according to a second embodiment of the present invention.

[Explanation of symbols]

A1, A2 Tap holder 10 Holder body portion 12 Upper body portion 14 Middle portion body portion 16 Lower body portion 18 Insertion hole 18a Cylindrical portion 18b Detent portion 20, 30a, 30b, 32a, 32b, 54, 56
Oil supply hole 24, 34a, 34b, 36a, 36b Oil passage 38a, 38b, 40a, 40b Oil discharge hole 42, 44 Screw 46, 74 Hole portion 50 Collar portion 52, 72, 92 Through hole 70 Stop ring portion B Tap 80 Screw part 82 Blade part 84 Groove part 86 Shaft part 88 Shaft body part 90 Square part

Claims (11)

[Claims] 1. A tap holder for holding a tap, comprising: a supply hole for supplying a lubricant from the outside; and a discharge hole for discharging the lubricant supplied from the supply hole. Tap holder. 2. The tap holder is provided with a substantially cylindrical tubular portion having an insertion hole for inserting a shaft portion of the tap, and a discharge hole is provided at a lower end of the tubular portion. The tap holder according to Item 1. 3. The tap holder according to claim 2, wherein the pair of discharge holes are provided at symmetrical positions with respect to the axis of the cylindrical portion. 4. A detent portion having a substantially rectangular cross section, into which a square portion having a substantially square cross section at the base end of the tap is fitted, is provided at the back of the insertion hole of the tap holder, and the pair of discharge holes are provided. The tap holder according to claim 3, wherein the tap holder is provided at a position equidistant from a substantially square corner portion of the rotation stopping portion. 5. A pair of ejection holes provided at a lower end of the tubular portion at a position offset by a predetermined angle from the pair of ejection holes, the positions being symmetrical with respect to the axis of the tubular portion. The tap holder according to claim 3, wherein a discharge hole for discharging the lubricant is provided in the discharge hole provided in the tap holder. 6. The tap holder according to claim 1, wherein a plurality of discharge holes are provided and any discharge hole in the plurality of discharge holes can be closed. . 7. The tap holder further has a supply hole for supplying a lubricant from the outside, and a passage part for supplying the lubricant to the upper end of the inner part of the insertion hole for inserting the shaft part of the tap. The tap holder according to any one of claims 1 to 6. 8. The tap holder according to claim 1, wherein the number of discharge holes is smaller than the number of grooves provided in the threaded portion of the tap attached to the tap holder. 9. A tap holder for holding a tap, comprising: a holder body portion, a collar portion, and a retaining ring portion, wherein the holder body portion has an insertion hole through which a shaft portion of the tap is inserted. And a first supply hole provided in the side surface part, and a passage part for sending the lubricant supplied from the first supply hole to the upper end of the deep part of the insertion hole. At the same time, it has a second supply hole provided in the side surface portion and two pairs of discharge holes provided at the lower end of the tubular portion, which are discharge holes connected from the second supply hole through the passage portion, The collar portion has a hole portion for fixing the tap inserted into the hole, the collar portion has a through hole for inserting the tubular portion, and the side surface portion supplies the lubricant to the first supply hole. And a second hole portion for supplying a lubricant to the second supply hole, Because wheel unit, and having a through hole for inserting the tubular portion, the tap holder and having a hole for fixing the tap. 10. The tap holder according to claim 1, wherein the lubricant is oil. 11. A tap having a through hole extending from a base end portion to a tip end portion along an axial center.