JP2508025B2 - Counter boring head - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a counter boring head for deep hole machining, and more particularly to a counter boring head whose machining dimensions can be adjusted over a wide range.

(Prior art) For cutting tools that perform deep hole drilling, it is important to discharge chips, cool the cutting edge, and lubricate during drilling. In addition to long drills, drills with oil holes , Candrill, BTA, ejector drill, etc. are used. BTA sends high pressure cutting fluid through the outside of the boring bar,
It is a method of reaching the cutting edge of the boring head and collecting chips through the inside of a hollow boring bar.

As shown in Fig. 2, the BTA is usually equipped with one carbide cutting blade 101 and two cemented carbide support pads 102 and 103 on the head 100, and as with a gun drill, a deep hole with a diameter of about 200 times the diameter. However, accurate processing can be performed without step feed. This BTA has solid boring heads, trepan boring heads, counter boring heads, floating boring heads, etc. depending on the application.

(Problems to be solved by the invention) However, in the above-mentioned conventional BTA counter boring head, when performing hole machining, first, the head 100 is set with the cemented carbide cutting blade 101 and each of the cemented carbide pads 102, 103, and then the hole is formed. In order to obtain the required dimensional accuracy by polishing these carbide cutting blades 101 and cemented carbide pads 102, 103 with a grinder in accordance with the processing dimensions of each time, it takes a lot of time and labor for head adjustment work. However, as a result, there is a problem in that work efficiency is reduced and productivity is reduced.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a counter boring head capable of adjusting the machining size of the head over a wide range and facilitating the adjustment work of the head. .

(Means for Solving the Problems) According to the present invention in order to achieve the above object, according to the present invention, a cemented carbide cutting blade that makes a hole on the outer periphery of a head and a cemented carbide that slides on the inner peripheral surface of the hole to be made. In a counter boring head that is provided with a pad and that performs deep hole machining, a cartridge that holds the cemented carbide cutting blade in an exchangeable manner, and a cartridge that is detachably attached to the head and that allows the cartridge to be attached and detached according to the machining dimension. A cemented carbide cutting edge holding member consisting of a tool block that holds the cemented carbide cutting edge so that it can be slidably held in the radial direction, the support pad that holds the cemented carbide pad, and the head can be replaced. And a seat unit detachably holding the support pad,
A cemented carbide pad holding member, which is interposed between the head and the chute unit and includes a spacer that adjusts the radial position of the head of the chute unit, is provided.

(Operation) The cutting position of the cemented carbide cutting blade is adjusted according to the machining dimension by the cemented carbide cutting edge holding member, and the position of the cemented carbide pad is adjusted according to the machining dimension by the cemented carbide pad holding member. This facilitates the adjustment of the cemented carbide cutting blade and the cemented carbide pad according to the processing size. The machining dimensions can be adjusted over a wide range by exchanging the cemented carbide cutting blade holding member and the cemented carbide pad holding member for each predetermined machining dimension.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an assembly perspective view of a BTA counter boring head to which the present invention is applied. The BTA counter boring head 1 is a head 2, a cemented carbide cutting blade holding member 3 detachably mounted on the head 2, a cemented carbide pad. The head 2 is composed of holding members 4 and 5, a guide member 6 and the like, and the head 2 has a notch 2b for mounting the cemented carbide blade holding member 3 on the end face of one end 2a and a chip on a hollow boring bar (not shown). A through hole 2c for sending out is formed, and a storage portion 2b 'for storing the carbide cutting edge holding member 3 of the notch 2b is formed with a locking portion 2h at one end opening in the circumferential direction and a groove 2k at the other end. The grooves 2d, 2d and 2e are formed in parallel with the axial direction at predetermined positions on the outer peripheral surface. As shown in the drawing, a screw hole 2i is obliquely formed in the locking portion 2h. Further, a square screw 2g for removably attaching the head 2 to the boring bar is engraved on the outer peripheral surface of the other end 2f of the head 2.

The cemented carbide cutting blade holding member 3 includes a cemented carbide cutting edge 30 and the cemented carbide cutting edge 30.
And a tool block 32 that holds the cartridge 31 so that the cartridge 31 can be attached and detached and its position can be adjusted in the radial direction. The cartridge 31 has a carbide cutting blade 30 removably attached to one side of the tip of the upper surface thereof, and an elliptical bolt insertion hole which penetrates from the upper surface to the bottom surface at a substantially central position and is long along the longitudinal direction of the cartridge 31. 31
A bolt is provided at a center position of the rear end face, and a positioning adjustment bolt 33 is screwed into the rear end face so as to be able to advance and retreat vertically to the rear end face. The cartridge 31 is a common component used over the entire range of the processing size of the head 2. In addition, the carbide cutting edge 30
Used a throw-away tip.

The tool block 32 is for holding the cartridge 31, and one side of the upper surface is formed with a notch 32a opening to the front end and the side surface so as to removably fit the cartridge 31, and a substantially central position of the bottom surface of the notch 32a. The cartridge 31
A screw hole 32b is bored at a position where it can face the bolt insertion hole 31a, and a locking surface 32 forming a taper surface on one side of the rear end of the upper surface.
c is formed, and a notch 32d is further formed at one side of the front end of the upper surface. The notch 32d can face the locking portion 2h and vertically faces the screw hole 2i of the locking portion 2h. Stop face 2e
Are formed. The tool block 32 is detachably stored in the storage portion 2b 'of the cutout 2b of the head 2. As described above, the tool block 32 holds the cartridge 31 and roughly adjusts the processing size (height from the outer peripheral surface of the head 2) of the cemented carbide cutting blade 30. For each predetermined processing size, for example, 10 mm. / A certain number of parts are manufactured as replacement parts for each diameter, and can be replaced as appropriate.

The wedge 37 is removably and removably fitted into the groove 2k continuously provided in the storage portion 2b 'of the cemented carbide notch member 3 of the head 2 via the wedge screw 38 screwed into the screw hole 37a, and the taper is tapered. The bottom surface 37b formed on the surface can be brought into contact with the locking surface 32c of the tool block 32 to prevent the tool block 32 from deviating from the storage portion 2b 'in the arrow A direction. The wedge screw 38 is rotatably locked to a locking portion (not shown) formed in the groove 2k through a central small diameter portion 38a, and the wedge 37 is rotated by rotating a screw portion.
It is possible to move back and forth. Further, a screw 39 is screwed in a screw hole 2i of a locking portion 2h protrudingly provided at the opening end of the storage portion 2b 'so that the screw 39 can advance and retreat, and the screw 39 has a tip end surface of the cutout 32d of the tool block 32. The tool block 32 is brought into contact with the locking surface 32e to prevent the tool block 32 from deviating from the storage portion 2b 'in the arrow B direction.

The super hard pad holding member 4 adjusts the height of the super pad 40, the support pad 41 that holds the super pad 40, the seat unit 42 that detachably holds the support pad 41, and the seat unit 42. It is composed of a spacer 43 and the like. The support pad 41 has substantially the same length as the groove 2d of the head 2, a groove 41c is formed substantially in the center of the outer peripheral surface 41a along the longitudinal direction, and the bottom surface 41b is formed so that its cross-sectional shape is substantially semicircular. A bolt insertion hole 41d penetrating from the outer peripheral surface 41a to the bottom surface 41b is formed at the center position. Carbide pad 40
Is fitted and fixed in the groove 41c of the outer peripheral surface 41a of the support pad 41. Support pad 41 with this carbide pad 40
Like the cartridge 31, it is a common component used over the entire range of the processing size of the head 2.

The support unit 42 is set so that it can be fitted into the groove 2d of the head 2 and the height thereof is set to a predetermined dimension higher than the depth of the groove 2d, and the bottom surface 41 of the support pad 41 is provided on the outer peripheral surface.
A groove 42a having a semicircular cross section which is fitted with b is formed, and bolt insertion holes 42c, 42c for inserting two bolts 45, 45 from the outer peripheral surface 42a to the bottom surface 42b at predetermined intervals along the longitudinal direction.
Has been installed. This support unit 42 is for roughly adjusting the processing size (height from the outer peripheral surface of the head 2) of the carbide pad 40, and like the tool block 32, every predetermined processing size of the head 2, that is, 10 mm. / A predetermined number of replacement parts are exchanged for each diameter, and can be replaced appropriately.

The spacer 43 is set to a size that can be inserted into the groove 2d of the head 2 and has a bolt insertion hole 43a at a position corresponding to each bolt insertion hole 42c of the support unit 42. This spacer 43 is the bottom surface of the groove 2d of the head 2 and the support unit.
The support unit 42 is removably interposed between the bottom surface 42b and the bottom surface 42b of the support unit 42 to finely adjust the machining position, that is, a predetermined number of replacement parts are manufactured, and each plate thickness has a predetermined value. The dimensions are set so that they can be replaced as appropriate according to the processing dimensions. Further, on the bottom surface of the groove 2d of the head 2, the bolt insertion holes 42c, 4 of the support unit 42 and the spacer 43 are formed.
A screw hole (not shown) is formed at a position corresponding to 3a.

The cemented carbide pad holding member 5 is also configured similarly to the cemented carbide pad holding member 4.

The guide member 6 includes a support pad 60, a seat unit 61 that holds the support pad 60, a spacer 62, and the like. The seat unit 61 is set to a predetermined size that can fit in the groove 2e of the head 2 and has a height higher than the depth of the groove 2e, and a hole for fitting the support pad 60 in the approximate center of the outer peripheral surface thereof. Bolt insertion holes 61b and 61b are formed on both sides of the hole 61a for inserting the two bolts 66 and 66, respectively. This seat unit 61 is a seat unit
Similar to 42, for each of the predetermined processing dimensions of the head 2, that is, the above
A certain number of parts are manufactured as replacement parts that are replaced every 10 mm / diameter, and can be replaced as appropriate.

The spacer 62 is detachably fitted into the hole 2e of the head 2,
Bolt insertion holes 62a are formed at positions corresponding to the respective bolt insertion holes 61b of the support pad 61. Similar to the spacer 43, the spacer 62 is for finely adjusting the processing size of the support pad 61, and a predetermined number of replacement parts are produced, and each plate thickness is set to a predetermined size like the spacer 43 and processed. It can be exchanged as appropriate according to the size.
Further, the support pad 6 is provided on the bottom surface of the groove 2e of the head 2.
1. Screw holes 2n are formed in the spacer 62 at positions corresponding to the respective bolt insertion holes 61b and 62a.

Next, a case where the cemented carbide cutting blade holding member 3, the cemented carbide pad holding members 4, 5, and the guide member 6 are attached to the head 2 and each of these members 3 to 6 is adjusted according to the processing size will be described. .

First, the wedge screw 38 is locked in the groove 2k continuously provided in the storage portion 2b 'of the head 2, and the screw 39 of the locking portion 2h is retracted, and then the predetermined processing is performed in the storage portion 2b'. The tool block 32 that fits the dimensions is stored, the wedge 37 is inserted into the groove 2k and screwed into the wedge screw 38, and the wedge screw 38 is rotated to rotate the bottom surface of the wedge 37.
37b is brought into pressure contact with the tapered surface 32c of the tool block 32, and the tool block 32 is firmly locked in the direction of arrow A so as not to deviate. Further, the screw 39 is advanced to bring its tip end surface into pressure contact with the engaging surface 32e of the notch 32d of the tool block 32 to firmly immobilize the tool block 32 in the arrow B direction immovably.

Then, the carbide cutting edge 30 is placed in the notch 32a of the tool block 32.
The cartridge 31 in which is mounted is stored, the bolt 34 is inserted into the bolt insertion hole 31a through the washer 35, and screwed into the screw hole 32b to fix the cartridge 31 to the tool block 32. In this state, the head end surface of the bolt 33 of the cartridge 31 can come into contact with the facing end surface 32f of the cutout 32a. In this way, the cemented carbide cutting blade holding member 3 is mounted and fixed to the head 2.

Further, the seat unit 42 is fitted into the groove 2d of the head 2 via the spacer 43, and the both are screwed and fixed in the groove 2d by the bolt 45. As the spacer 43 and the sheet unit 42, those having a plate thickness and a height adapted to the processing size are used. Then, the groove 42a of the seat unit 42
Bottom 41 of support pad 41 with carbide pad 40 installed inside
Fit b and fix with bolts 46. In this way, the cemented carbide pad holding member 4 is mounted and fixed in the groove 2d of the head 2 in accordance with the predetermined processing size. The cemented carbide pad holding member 5 is also firmly mounted and fixed in the groove 2d of the head 2 in the same manner as the cemented carbide pad 4.

Further, the support pad 6 is provided in the groove 61a of the seat unit 61.
0 is fitted and screwed and fixed with bolts 65. Next, the seat unit 61 is fitted into the groove 2e of the head 2 via the spacer 62, and the both are screwed and fixed to the groove 2e by the bolt 66. The sheet unit 61 and the spacer 62 have a height and a plate thickness according to the processing size.
In this way, the guide member 6 is firmly mounted and fixed in the groove 2e of the head 2 in accordance with the processing size.

To adjust the processing dimension of the carbide cutting edge 30, loosen the bolt 34 that fixes the cartridge 31 to allow the cartridge 31 to move in the direction of arrow B, and then turn the positioning bolt 33 to rotate the cartridge 31. The amount of extension in the direction of the arrow B is adjusted, and the end face of the head is brought into contact with the end face 32f of the notch 32a to adjust the position of the cemented carbide cutting edge 30 to the machining size. Next, the bolts 34 are tightened to firmly fix the cartridge 31 to the tool block 32. In this way, the cemented carbide cutting edge 30 is set at the machining dimension position.

When the machining size is slightly changed, that is, when the machining size is finely adjusted, the feeding amount of the cartridge 31 of the carbide cutting edge holding member 3 is adjusted by the bolt 33, and each carbide pad holding member 4, 5 and the guide member 6 are spacers 43 and 53.
Adjust by changing the plate thickness of 62 and 62. Further, when the machining size is changed significantly, the tool block 32 of the carbide cutting edge holding member 3, the carbide pad holding members 4 and 5, and the sheet units 42, 52 and 61 of the guide member 6 are respectively processed. After exchanging with the one manufactured according to the size, each fine adjustment is performed.

Thus, the carbide cutting blade 30 and the carbide pad to be attached to the head 2
Each machining dimension of 40 is a tool block according to the machining dimension
32, the seat units 42, 52, 61 are exchanged for coarse adjustment, and the bolts 33 of the cartridge 31 are advanced and retracted, the spacers 43,
It is possible to adjust over a wide range by exchanging 53 and 62 and performing fine adjustment.

(Effects of the Invention) As described above, according to the present invention, a deep cutting is provided with a carbide cutting edge for making a hole on the outer periphery of the head and a carbide pad that makes sliding contact with the inner peripheral surface of the hole to be processed. In the counter boring head for performing the above, a cartridge that holds the cemented carbide cutting blade in a replaceable manner, and a cartridge that is replaceably mounted on the head and that allows the cartridge to be attached and detached and to be slidable in a radial direction according to a processing dimension by a screw mechanism A carbide cutting edge holding member comprising a tool block for holding and adjusting the position of the cemented carbide cutting edge, a support pad for holding the cemented carbide cutting pad, and the support pad exchangeably mounted on the head And a space for interposing between the head and the chute unit for adjusting the radial position of the head of the chute unit. By adopting a configuration including a cemented carbide pad holding member composed of a blade, it becomes possible to adjust the machining dimensions of the cemented carbide cutting edge and the cemented carbide pad over a wide range, and moreover, the machining dimension can be adjusted. This can be performed extremely easily, and as a result, the adjustment time of the head can be significantly shortened, and the work efficiency and the productivity can be improved, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is an assembled perspective view showing an embodiment of a counter boring head according to the present invention, and FIG. 2 is a front view of a conventional counter boring head. 2 ... Head, 3 ... Carbide cutting edge holding member, 4, 5 ... Carbide pad holding member, 6 ... Guide member, 30 ... Carbide cutting edge (throw away tip), 31 ... Cartridge, 32 ...
… Tool block, 37… Wedge, 40, 50… Carbide pad, 41, 51… Support pad, 42, 52, 61… Seat unit, 42, 53, 62… Spacer.

Claims (4)

(57) [Claims] 1. A carbide cutting edge for making a hole on the outer periphery of a head,
In a counter boring head for deep hole machining, comprising a carbide pad that slides on the inner peripheral surface of the hole to be machined, a cartridge that holds the cemented carbide cutting blade in an exchangeable manner, and a cartridge that is exchangeably attached to the head. A cemented carbide cutting blade holding member, comprising: a tool block that is detachably held by a screw mechanism so as to be slidable in a radial direction in accordance with a processing dimension so that the position of the cemented carbide cutting edge can be adjusted; A support pad that holds a pad, a seat unit that is replaceably attached to the head and that detachably holds the support pad, and a diameter of the head of the chute unit that is interposed between the head and the chute unit. A counter boring head, comprising: a super hard pad holding member including a spacer for adjusting a position in a direction. 2. The counter boring head according to claim 1, wherein the cemented carbide cutting edge is a throw-away tip. 3. The counter boring head according to claim 1, wherein the tool block is exchanged for each predetermined machining size. 4. The counter boring head according to claim 1, wherein the counter boring head is replaced for each predetermined processing size of the seat unit.