JPH0549215U - Shank type pinion cutter - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a shank-type pinion cutter that has a throwaway type blade section and does not require troublesome generation grinding when re-grinding the blade section and that can be firmly attached. To do. [Structure] A handle portion 2 is provided at one end of a neck portion 3 of a main body 1, a blade portion is provided at the other end, and a step portion 4 is formed at the tip of the neck portion 3, and a mounting hole 11 for a throwaway blade portion 5 is formed in the step portion 4. Insert. Further, a bolt 7 having a head 6 having an inclined surface 10 that matches the scooping surface 9 of the throwaway blade is screwed into a reference hole 8 formed in the main body 1, and the head 6 of the bolt 7 is moved to the throwaway blade. Fix it to the part 5 closely.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shank type pinion cutter used for cutting gears of stepped gears and internal gears.

[0002]

[Prior Art]

 A stepped gear with a large opening between the large-diameter gear and the small-diameter gear or an internal gear with a large internal diameter can be trimmed by using a hob or an ordinary pinion cutter, but the internal diameter of the internal gear 19 In the case where is smaller, the tooth is cut by a shank type pinion cutter (see JIS B43 56, for example) in which the blade portion 5, the neck portion 3 and the handle portion 3 are integrally formed as shown in FIG. If the cutting edge wears, the scooping surface of the hob or the blade of a normal pinion cutter is ground and used again for gear cutting. However, if the scooping surface is regrinded many times each time it wears, the blade width becomes thin and it cannot be used anymore, resulting in a scrap product.

[0003]

[Problems to be solved by the device]

 As mentioned above, if the scooping surface of the pinion cutter becomes too thin to be used as a tool due to re-grinding, the entire body will be scrapped and the cost will increase. Further, depending on the size and shape of the work piece, the length of the neck is limited. For example, as shown in FIG. 4, the tooth profile grinding wheel 17 interferes with the large-diameter portion 16 of the handle 2 and a minute vibration is generated in the wheel. As a result, the tooth profile may have poor accuracy, or the work piece may be scratched, resulting in poor appearance. Further, as shown in FIG. 3, the shank type pinion cutter is used for gear cutting of the internal gear 19 having a relatively small pitch circle diameter, so that the cutter pitch circle diameter is small, which is usually about 50 mm or less. Further, if the pitch circle diameter is small, the tooth profile error of the gear to be machined tends to be large, and the tooth profile error will further increase as regrinding progresses, so the life of the conventional shank type pinion cutter was short.

[0004]

Means for Solving the Problems The present invention has been made to solve the above problems, and a step portion 4 is formed at a tip of a neck portion 3, and a throwaway type pinion blade portion is formed on the step portion 4. 5, a mounting hole 11 is fitted, and a bolt 7 having a head 6 having an inclined surface 10 that matches the scooping surface 9 of the throwaway pinion blade is bored along the central axis of the main body 1. A state in which the inclined surface 10 of the bolt head is in close contact with the scooping surface 9 of the throwaway type pinion blade while being inserted into the reference hole 8 and screwed into the screw hole 15 formed in a part of the reference hole. The throwaway type pinion blade 5 is a shank type pinion cutter fixed to the main body 1, and the throwaway type pinion blade 5 is firmly fixed to the neck 3.

[0005]

[Action]

 The blade portion mounting hole 11 at the center of the gear-shaped blade portion 5 is fitted into the step portion 4 and the mounting hole is seated in the step portion 4. Further, a bolt 7 having a head portion 6 is inserted with reference to a reference hole 8 formed along the central axis of the main body 1 and screwed into a screw hole 15 at an extension of the bolt 7. Therefore, the blade portion 5 is tightened in a state where the inclined surface 10 and the scooping surface 9 of the blade portion 5 are in close contact with each other, and the blade portion 5 is strongly fixed to the step portion 4.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIG. 1, the main body 1 is composed of a handle portion 2 mounted on a spindle of a machine tool (not shown) and a neck portion 3 integrally with the handle portion 2, and a step portion 4 is formed on the outer periphery of the tip of the neck portion. There is. Further, a reference hole 8 is formed along the axis XX of the main body 1, and a screw hole 15 is formed in an extension portion of the reference hole. The blade portion mounting hole 11 at the center of the gear-shaped throwaway pinion blade portion 5 (hereinafter referred to as a blade portion) is fitted into the step portion 4 and seated on the step portion 4. Further, a bolt 7 having a head portion 6 as will be described later is inserted with reference to a reference hole 8 formed along the central axis of the main body 1, and an elongated portion of the bolt 7 is screwed into a screw hole 15. There is. Therefore, the blade portion 5 is tightened toward the axis of the main body 1 and strongly fixed to the step portion 4.

As described above, the head 6 of the bolt 7 screwed into the reference hole 8 is formed with the inclined surface 10, and the blade portion 5 has the inclined surface 10 and the scooping surface of the blade portion 5. 9 and 9 are tightened in close contact. The throwaway blade 5 is fastened by bolts 7 toward the axis of the main body 1, and the throwaway blade 5 is firmly fixed to the step 4. Furthermore, a concave portion 21 is provided in the end face of the step portion 4 of the main body 1 in the radial direction, and the key 13 is inserted into the concave portion 21 and the key groove 22 provided in the mounting hole 11 of the blade portion 5 is formed. It is engaged and serves both as a detent for the blade and positioning.

Further, the screw 20 is screwed from the neck portion 3 of the main body 1 toward the central axis of the bolt 7, and the screw 20 reliably prevents the bolt 7 from loosening in the axial direction during cutting. However, the screw 20 may be omitted if it can be sufficiently fixed only by the bolt 7 without the screw 20. In the present embodiment, the handle 2 is also provided with a drawing screw 14 for attaching the pinion cutter to the spindle 18 of the gear cutting machine.

In the embodiment shown in FIG. 2, the throwaway type blade portion 5 has a large pitch circle diameter and a narrow neck portion, the backup portions 12 are provided in the same number as the number of blades, and the step portion 4 of the main body 1 is provided. The mounting hole 11 is brought into contact with. That is, the mounting hole 11 of the blade portion 5 is inserted between the stepped portions 4 of the main body, the bolt 7 is screwed in, and the inclined surface 10 formed on the head portion 6 thereof is brought into close contact with the scooping surface 9 of the blade portion. Tighten in the same manner as. A concave portion 21 is provided in the end face of the step portion 4 of the main body 1 in the radial direction, a key 13 is inserted into the concave portion 21, and the concave portion 21 is engaged with a key groove 22 provided in the mounting hole 11 of the blade portion 5. It also serves as a detent for the department and positioning.

[0010]

【effect】

 In this invention, as described above, the blade portion 5 is provided separately from the main body, and the head of the bolt and the scooping surface of the blade portion are brought into close contact with each other and fixed, so only the tooth profile of the initial cutting edge of the blade portion needs to be guaranteed. As in the past, generation grinding is no longer necessary, and it has become possible to efficiently grind the left and right tooth flanks of the blade part simultaneously by forming through grinding. Also, in the case of a small amount of gear cutting, sufficient accuracy can be obtained even if the tooth profile is formed by wire cutting, and even if the work of gear cutting is performed with slightly different dimensions, the main body remains as it is. It only needs to be replaced, which reduces the cost of tools and facilitates the manufacture of teeth. In addition, if the cutting edge wears out, it is only necessary to replace the blade, so extremely efficient cutting is possible.

[Brief description of drawings]

FIG. 1 is a front sectional view of an embodiment of the present invention.

FIG. 2 is a partial front sectional view of another embodiment of the present invention.

FIG. 3 is a state diagram in which the internal gear is cut by a pinion cutter.

FIG. 4 is a front sectional view of a conventional pinion cutter.

[Explanation of symbols]

 1. ． ． ． ． ． ． Main body 2. ． ． ． ． ． ． Handle 3. ． ． ． ． ． ． Neck 4. ． ． ． ． ． ． Step 5. ． ． ． ． ． ． Throw away blade 6. ． ． ． ． ． ． Head 7. ． ． ． ． ． ． Bolt 8. ． ． ． ． ． ． Reference hole 9. ． ． ． ． ． ． Scooping surface 10. ． ． ． ． ． ． Inclined surface 11. ． ． ． ． ． ． Blade mounting hole 12. ． ． ． ． ． ． Backup unit 13. ． ． ． ． ． ． Key 14. ． ． ． ． ． ． Drawing screw 15. ． ． ． ． ． ． Screw 16. ． ． ． ． ． ． Large diameter part 17. ． ． ． ． ． ． Whetstone 18. ． ． ． ． ． ． Spindle 19. ． ． ． ． ． ． Internal gear 20. ． ． ． ． ． ． screw

Claims (2)

[Scope of utility model registration request] 1. A shank-type pinion cutter having a shank (2) formed at one end of a neck (3) of a main body (1) and a blade provided at the other end, and a step is provided at the tip of the neck (3). The step (4) is formed, the mounting hole (11) of the throwaway pinion blade (5) is fitted into the step (4), and the scooping surface (9) of the throwaway pinion blade (5) is further formed. A bolt (7) having a head (6) having an inclined surface (10) conforming to (4) is inserted into a reference hole (8) formed along the central axis of the main body (1) and It is screwed into a screw hole (15) formed in a part of the reference hole, and the throwaway type with the slanted face (10) of the bolt head in close contact with the scooping face (9) of the throwaway type pinion blade part. Shank-shaped pinio, characterized in that the pinion blade part (5) is fixed to the main body (1). Ncutta. 2. A screw (2) in which the bolt (7) is screwed in radially from the outer peripheral surface of the neck (3) of the body (1).
The shank-type pinion cutter according to claim 1, wherein the loosening prevention in the axial direction is performed by 0).