JP2014151417A - Throw-away type hob - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throw-away type hob that can precisely adjust a fitting position of a throw-away tip in the tip thickness direction and facilitate tip replacement work.SOLUTION: In a throw-away tip type hob 1, a plurality of disk-like hob bodies 11 in which tip fitting seats 32L, 32R to which throw-away tips 51 are fitted, are alternately arranged right and left along a twist direction on both of right and left slopes 31L and 31R of a thread 31, are stacked, and one end 31a of one thread 31 is joined to the other end 31 b of the other thread 31 between adjacent hob bodies 11. The throw-away tips 51 can be fitted by bolts 52 to adjustment plates 53 fitted to the tip fitting seats 32La, 32Rb using a hollow bolt 54, and fitting positions of the throw-away tips 51 in the thickness direction can be adjusted by varying the thicknesses of the adjustment plates 53.

Description

  The present invention relates to a throw-away type hob that can adjust the attachment position of the throw-away tip in the chip thickness direction.

  2. Description of the Related Art Various types of throw-away tools have been provided in which a throw-away tip made of a hard material such as cemented carbide can be attached to a tool body as a tool for cutting gears to be machined.

  In such a throw-away tool, the throw-away tip is attached to the tool body via a shim in order to eliminate the discrepancy of the cutting edge position due to the machining error of the tool body or the attachment position error of the throw-away tip. Yes. Thereby, by changing the thickness of the shim, the attachment position of the throw-away tip can be adjusted, and the positions of the blade edges can be aligned with each other.

  And as a throwaway type tool as mentioned above, it is indicated by patent documents 1, for example.

JP-A 62-297016

  However, since the conventional throw-away tool employs a structure in which a shim is simply sandwiched between the tool body and the throw-away tip, the shim shifts when attempting to replace the throw-away tip. It took a lot of time to change the chip.

  Accordingly, the present invention solves the above-described problem, and provides a throw-away hob that can adjust the tip-thickness direction mounting position of the throw-away tip with high accuracy and can easily perform tip replacement work. The purpose is to provide.

The throw-away hob according to the first invention for solving the above-mentioned problem is
The tip mounting seat to which the throw-away tip for cutting the gear to be machined is attached is alternately turned left and right along the twist direction on the left and right slopes of the threaded portion formed in a screw shape along the outer periphery. While stacking multiple disc-shaped hob bodies that are arranged,
Between the adjacent hob main bodies, a throwaway hob adapted to connect one end of one threaded portion and the other end of the other threaded portion,
A mounting seat side bolt hole formed in the chip mounting seat;
An adjustment plate that is detachably mounted on the chip mounting seat and has a plate-side bolt hole formed so as to penetrate in the thickness direction;
The mounting seat side bolt hole and the plate side bolt hole of the adjustment plate mounted on the chip mounting seat are tightened, and a hollow shape in which screws are formed on the inner peripheral surface and the outer peripheral surface thereof. Hollow bolts,
A tip side bolt hole formed through the throwaway tip in the thickness direction;
A bolt that is tightened across a hollow hole of the hollow bolt in which the adjustment plate is attached to the tip mounting seat, and the tip side bolt hole of the throw-away tip attached to the adjustment plate after attachment. With
By changing the thickness of the adjustment plate, the attachment position in the thickness direction of the throw-away tip can be adjusted.

The throw-away hob according to the second invention for solving the above-mentioned problem is
The throw-away tip is attached to the tip mounting seats disposed at one end and the other end of the screw thread portion via the adjustment plate.

The throw-away hob according to the third invention for solving the above-mentioned problem is
The adjustment of the thickness of the adjustment plate is performed according to a shift amount when one end of the screw thread and the other end of the screw thread are connected.

  Therefore, according to the throw-away type hob according to the present invention, since the throw-away tip can be attached to the adjustment plate attached to the tip mounting seat using the hollow bolt, the tip thickness of the throw-away tip is reduced. The mounting position in the vertical direction can be adjusted with high accuracy, and the chip replacement work can be easily performed.

It is the perspective view which showed the assembly state of the throwaway type hob which concerns on one Example of this invention. It is the perspective view which showed the decomposition | disassembly state of the throwaway type hob which concerns on one Example of this invention. It is an enlarged view of a hob main body. It is the figure which showed the attachment state of the throw away tip.

  Hereinafter, the throw-away hob according to the present invention will be described in detail with reference to the drawings.

  A throw-away hob 1 shown in FIGS. 1 and 2 is a tool for cutting a gear to be machined (not shown), and includes a plurality (three in FIGS. 1 and 2) of hob bodies 11 and And a pair of left and right shaft members 12. A throw-away tip 51 having a rectangular flat plate shape can be attached to the outer peripheral portion of the hob body 11.

  Next, the configuration of the hob 1 will be specifically described with reference to FIGS. 1 to 4.

  As shown in FIG. 1 to FIG. 3, the hob body 11 is formed in a disc shape, and a shaft-shaped shaft portion 21 provided at the center thereof and a screw-like screw thread portion (provided at the outer periphery thereof) ( Cutting edge portion) 31.

  An attachment hole 22 and an assembly hole 23 are formed in the shaft portion 21. Among these, the mounting hole 22 is a through hole used when the hob 1 is attached to a hobbing machine (not shown), and is arranged coaxially with the rotation axis (center axis) O of the hob 1. On the other hand, the assembly hole 23 is a through hole used when connecting the plurality of hob bodies 11 and the pair of left and right shaft members 12, and is radially outside the mounting hole 22 and in the circumferential direction of the hob. They are arranged at equiangular intervals.

  The thread portion 31 is formed in a screw shape along the outer peripheral portion of the shaft portion 21, and the number of turns of the thread portion 31 is one. The thread section 31 has a substantially triangular cross section perpendicular to the twist direction (winding axis direction). The left slope 31L and the right slope 31R of the thread 31 have concave chip mounting seats. 32L and 32R are alternately formed on the left and right sides at predetermined intervals along the twist direction. A throw-away tip 51 is detachably attached to each tip attachment seat 32L, 32R by a bolt 52.

  Further, groove-shaped chip pockets 33 are formed in the thread portion 31 at predetermined intervals along the twist direction. The chip pocket 33 is disposed on the front side in the hob rotation direction of the chip mounting seats 32L and 32R, and communicates with the chip mounting seats 32L and 32R.

  That is, by attaching the throw-away tip 51 to the tip mounting seats 32L and 32R, the cutting edge of the throw-away tip 51 faces the chip pocket 33 toward the front side in the hob rotation direction. As a result, the chips generated by the throw-away tip 51 are discharged into the chip pocket 33.

  A tip mounting seat 32L (hereinafter, referred to as a tip mounting seat 32La) formed on the left slope 31L is disposed at one end 31a of the thread portion 31. On the other hand, a tip mounting seat 32R (hereinafter referred to as a tip mounting seat 32Rb) formed on the right slope 31R is disposed at the other end 31b of the thread portion 31. That is, the attachment position of the throw-away tip 50 is reversed on the left and right sides at the one end 31a of the thread portion 31 and the other end 31b of the thread portion 31.

  In addition, the shaft member 12 is also provided with a mounting hole 42 and an assembly hole 43. That is, the mounting hole 42 and the assembly hole 43 are through-holes communicating with the mounting hole 22 and the assembly hole 23 when the hob body 11 and the shaft member 12 are overlapped.

  Here, as described above, the throw-away tip 51 is attached to the tip mounting seats 32L and 32R using the bolt 52. As shown in FIGS. 3 and 4, the throw-away tip 51 is When attaching to the tip mounting seat 32La formed at one end 31a of the threaded portion 31 and the tip mounting seat 32Rb formed at the other end 31b of the threaded portion 31, in addition to the use of the bolt 52, a rectangular flat plate The adjustment plate 53 having a shape and the hollow bolt 54 having a hollow shape are also used. In FIG. 4, only the attachment state of the throw-away tip 51 to the tip attachment seat 32Rb of the other end 31b is illustrated.

  Specifically, bolt holes (mounting seat side bolt holes) 32a are formed in the chip mounting seats 32La and 32Rb. In contrast, the adjustment plate 53 is attached to the chip attachment seats 32La and Rb, so that the attachment position of the throw-away tip 51 in the chip thickness direction (the protruding amount in the chip thickness direction) can be adjusted. And a predetermined thickness. The adjustment plate 53 is formed with a bolt hole (plate-side bolt hole) 53a penetrating in the thickness direction. The bolt hole 53a is connected to the chip mounting seats 32La and 32Rb. When mounted, the bolt hole 32a communicates with the bolt hole 32a.

  A flange 54 a is provided at the base end of the hollow bolt 54, and screws are formed on the inner peripheral surface (hollow hole 54 b) and the outer peripheral surface of the hollow bolt 54. Thereby, the outer peripheral surface of the hollow bolt 54 can be fastened to the opposed bolt holes 32a and 53a, and the adjustment plate 53 is attached to the chip attachment seats 32La and 32Rb. On the other hand, the bolt 52 can be tightened in the hollow hole 54 b of the hollow bolt 54.

  Further, the throw-away tip 51 is formed with a bolt hole (tip-side bolt hole) 51a penetrating in the thickness direction, and the throw-away tip 51 is attached to the adjustment plate 53 in this bolt hole 51a. In this case, it communicates with the hollow hole 54b of the hollow bolt 54 to which the adjustment plate 53 is attached. That is, the bolt 52 can be fastened to the opposed bolt hole 51 a and the hollow bolt 54.

  From the above, when the throw-away tip 51 is attached to the tip attachment seats 32La and 32Rb, first, after the adjustment plate 53 is attached to the tip attachment seats 32La and 32Rb, the hollow bolt 54 is inserted between the bolt holes 32a and 53a. Tighten over.

  Accordingly, the flange portion 54a of the hollow bolt 54 is locked to the bolt hole 53a so as to press the adjustment plate 53 toward the chip mounting seats 32La and 32Rb. As a result, the adjustment plate 53 is attached to the chip attachment seats 32La and 32Rb.

  Next, after the throw-away tip 51 is attached to the adjustment plate 53 attached to the tip attachment seats 32La and 32Rb, the bolt 52 is tightened across the bolt hole 51a and the hollow hole 54b of the hollow bolt 54.

  As a result, the head 52a of the bolt 52 is locked in the bolt hole 51a so as to press the throw-away tip 51 toward the adjustment plate 53 side. As a result, the throw-away tip 51 is attached to the tip attachment seats 32La and 32Rb via the adjustment plate 53.

  At this time, a plurality of types of adjustment plates 53 having different thicknesses are prepared in advance, and the chip thickness of the throw-away tip 51 is selected from the plurality of types of adjustment plates 53 having different thicknesses. The selection is made according to the vertical mounting position.

  Further, when replacing the throw-away tip 51 attached to the tip mounting seats 32La and 32Rb, it is possible to replace with another throw-away tip 51 by removing only the bolt 52. Even if the throw-away tip 51 is replaced, the adjustment plate 53 remains attached to the tip mounting seats 32La and 32Rb by the hollow bolt 54, and therefore the positional deviation of the adjustment plate 53 is not changed. Will be prevented.

  Thereby, even if another throw-away tip 51 is attached, the tip-thickness direction attachment position of the other throw-away tip 51 is the same as the tip-thickness direction attachment position of the throw-away tip 51 previously attached. Position. That is, since the throw-away tip 51 is exchanged with respect to the adjustment plate 53 attached by the hollow bolt 54, the tip-thickness direction attachment position of the throw-away tip 51 has resilience.

  Accordingly, when assembling the hob 1, first, a plurality of hob bodies 11 and a pair of left and right shaft members 12 are prepared, and chip mounting seats 32L and 32R (including chip mounting seats 32La and 32Rb) in each hob body 11 are prepared. ) Is attached to the throw-away tip 51.

  Next, after arranging the plurality of hob bodies 11 on the same axis, the shaft parts 21 facing each other are abutted between the adjacent hob bodies 11, and one end of one screw thread part 31 and the other screw thread part 31. Connect the other end of. That is, a hob body in which the thread 31 is multi-turned can be obtained by overlapping a plurality of hob bodies 11 in which the thread 31 is one turn.

  Then, the shaft member 12 is overlapped with the overlapped hob body 11 from both the left and right sides. That is, the shaft portion 21 of the hob main body 11 located on the leftmost side of the plurality of superimposed hob main bodies 11 and the one shaft member 12 are abutted and the shaft of the hob main body 11 located on the rightmost side thereof. The part 21 and the other shaft member 12 are butted together.

  Next, assembly bolts (not shown) are tightened in the assembly holes 23 and 43 communicated by the butting of the shaft portion 21 of the hob body 11 and the shaft member 12. Thereby, the plurality of hob bodies 11 and the pair of left and right shaft members 12 are connected, and the assembly of the hob 1 is completed.

  Here, as described above, when assembling the hob 1, one end of one screw thread portion 31 and the other end of the other screw thread portion 31 are connected between adjacent hob bodies 11. . However, a machining error of the screw thread portion 31 and the like in the hob body 11 and a joining error between the screw thread portions 31 are not a little generated. And depending on the magnitude of these errors, there is a possibility that a shift (step) may occur in a joining portion (mating surface) 34 between one end of one screw thread portion 31 and the other end of the other screw thread portion 31. Yes (see FIG. 1).

  As described above, when the joining portion 34 is displaced, in particular, the tip thickness direction attachment position of the throw-away tip 50 attached to the tip attachment seats 32La and 32Rb is determined based on the tooth profile shape of the gear to be processed. It will be lower or higher than the mounting position.

  Therefore, in the tip mounting seats 32La and 32Rb, the throw-away tip 51 is attached using the adjustment plate 53 and the hollow bolt 54. When the throwaway tip 51 is attached to the tip attachment seats 32La and 32Rb via the adjustment plate 53, the adjustment is made so that the attachment position in the tip thickness direction of the throwaway tip 50 is a predetermined attachment position. The thickness of the plate for use 53 is set.

  In the above-described embodiment, only the tip mounting seat 32La formed at the one end 31a of the screw thread portion 31 and the tip mounting seat 32Rb formed at the other end 31b of the screw thread portion 31 are provided with the adjustment plate 53 and Although the hollow bolt 54 is applied, these may be applied at least to the chip mounting seats 32La and 32Rb, and can be applied to any of the other chip mounting seats 32L and 32R as necessary.

  Therefore, according to the throw-away type hob 1 according to the present invention, when the hob 1 is assembled (when the thread portions 31 are overlapped), the joining portion 34 between the adjacent cutting blade portions 31 is displaced. However, by changing the thickness of the adjustment plate 53, the thickness direction mounting position of the throw-away tip 51 can be adjusted with high accuracy.

  Further, the bolt 52 for attaching the throw-away tip 51 can be fastened to the hollow bolt 54 for attaching the adjustment plate 53, so that the throw-away tip 51 is removed without removing the adjustment plate 53. Therefore, the replacement work of the throw-away tip 51 can be easily performed.

  The present invention is applicable to a throw-away tool for the purpose of improving the attachment rigidity of the throw-away tip.

DESCRIPTION OF SYMBOLS 1 Hob 11 Hob main body 12 Shaft member 21 Shaft part 31 Thread part 31L Left slope 31R Right slope 31a One end 31b Other end 32L, 32R Tip mounting seat 32a Bolt hole 34 Connecting part 51 Throw away tip 51a Bolt hole 52 Bolt 52a Head Part 53 adjustment plate 53a bolt hole 54 hollow bolt 54a flange part 54b hollow hole

Claims (3)

The tip mounting seat to which the throw-away tip for cutting the gear to be machined is attached is alternately turned left and right along the twist direction on the left and right slopes of the threaded portion formed in a screw shape along the outer periphery. While stacking multiple disc-shaped hob bodies that are arranged,
Between the adjacent hob main bodies, a throwaway hob adapted to connect one end of one threaded portion and the other end of the other threaded portion,
A mounting seat side bolt hole formed in the chip mounting seat;
An adjustment plate that is detachably mounted on the chip mounting seat and has a plate-side bolt hole formed so as to penetrate in the thickness direction;
The mounting seat side bolt hole and the plate side bolt hole of the adjustment plate mounted on the chip mounting seat are tightened, and a hollow shape in which screws are formed on the inner peripheral surface and the outer peripheral surface thereof. Hollow bolts,
A tip side bolt hole formed through the throwaway tip in the thickness direction;
A bolt that is tightened across a hollow hole of the hollow bolt in which the adjustment plate is attached to the tip mounting seat, and the tip side bolt hole of the throw-away tip attached to the adjustment plate after attachment. With
The throw-away hob characterized in that the thickness-direction mounting position of the throw-away tip can be adjusted by changing the thickness of the adjustment plate. The throw-away hob according to claim 1,
The throw-away tip is attached to the tip mounting seats disposed at one end and the other end of the threaded portion via the adjustment plate. The throwaway hob according to claim 1 or 2,
The throw-away hob is characterized in that the adjustment of the thickness of the adjustment plate is performed according to a shift amount when one end of the screw thread is connected to the other end of the screw thread.

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