CN218016214U

CN218016214U - Worm hob

Info

Publication number: CN218016214U
Application number: CN202222157492.8U
Authority: CN
Inventors: 叶妙正
Original assignee: ZHEJIANG SHANGYOU TOOLS CO Ltd
Current assignee: ZHEJIANG SHANGYOU TOOLS CO Ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-12-13
Anticipated expiration: 2032-08-16

Abstract

The utility model provides a worm hobbing cutter belongs to cutter technical field. The worm cutting tool solves the problems that the existing worm cutting tool for machining worms is poor in product effect and high in machining cost. The worm hob comprises a hob body with a plurality of spiral lines, wherein the middle part of the hob body is axially provided with a shaft hole, the hob body is provided with a plurality of cutting edges, the number of the spiral lines is three, and the three spiral lines are respectively a first spiral line, a second spiral line and a third spiral line, the cutting edges are uniformly distributed along the first spiral line, the second spiral line and the third spiral line, a transmission shaft is assembled in a shaft hole of the hob cutter body and connected in the shaft hole through a key block, a key groove for installing the key block is formed in the surface of the transmission shaft, and a quick-release assembly is arranged at the front end of the transmission shaft assembled with the hob cutter body. The utility model has the advantages of machining efficiency is high, the machining precision is high and with low costs.

Description

Worm hob

Technical Field

The utility model belongs to the technical field of the cutter, a hobbing cutter is related to, in particular to worm hobbing cutter.

Background

The worm transmission mechanism consists of a worm and a worm wheel, and the worm is a driving part generally. The worm transmission has large transmission ratio, and the gear transmission can be realized only by multi-stage transmission under the same transmission ratio, so the worm transmission has compact structure, light weight and small volume.

The worm machining mode mainly comprises turning, milling and grinding, but in the actual machining process, the turning (turning tool) precision is not high, and the machined surface roughness is poor; the milling efficiency of milling (milling cutter) is not high, and the industrial production is influenced; the cost of grinding (sharpening) is too high and the economical efficiency is poor.

Therefore, in view of the above reasons, we have designed a worm hob with high stability, high precision and high efficiency to machine a worm.

Disclosure of Invention

The utility model aims at providing a worm hobbing cutter that machining efficiency is high, the machining precision is high and with low costs to the above-mentioned problem that exists among the prior art.

The purpose of the utility model can be realized by the following technical proposal: a worm hob is characterized by comprising a hob body with a plurality of spiral lines, wherein a shaft hole is axially formed in the middle of the hob body, a plurality of cutting edges are arranged on the hob body, the number of the spiral lines is three, and the spiral lines are respectively a first spiral line, a second spiral line and a third spiral line, the cutting edges are uniformly distributed along the first spiral line, the second spiral line and the third spiral line, a transmission shaft is assembled in the shaft hole of the hob body, the transmission shaft is connected in the shaft hole through a key block, a key groove for mounting the key block is formed in the surface of the transmission shaft, and a quick-release assembly is arranged at the front end of the transmission shaft assembled with the hob body;

the quick detach subassembly by spacing clamp plate with can link firmly spacing clamp plate at the epaxial locking screw of transmission and constitute, the transmission shaft surface set up with the keyway communicate with each other and supply the mounting groove of spacing clamp plate installation, spacing clamp plate the inner have the face that compresses tightly to the keyway, spacing clamp plate bottom the guide bar that has two symmetry settings and outside vertical extension, set up two guide ways that supply corresponding guide bar direction to stretch into on the groove face of mounting groove, the guide way in have the locating lever, the guide bar sliding sleeve locate on the locating lever, the guide bar on set up the spout that supplies the locating lever to slide to insert inwards by its bottom, the spout in and be located and support between locating lever and the guide bar and be provided with the spring.

In the worm hob, the depth of the installation groove is greater than the depth of the key groove.

In the worm hob, the rear end part of the key block is provided with a top groove.

Compared with the prior art, the worm hob has the advantages that the machining time is shorter than that of gear milling, the cost is reduced compared with that of gear grinding, 15% of machining time can be saved compared with that of gear milling under the same condition, and the cost is reduced by 20% compared with that of gear grinding. As the number of worm heads increases, the time savings and cost reductions become more significant; besides, the hob dismounting device has the effect of fast dismounting, and is convenient for maintenance of the hob.

Drawings

Fig. 1 is a schematic sectional structure diagram of the worm hob.

Fig. 2 is a perspective view of the drive shaft.

In the figure, 1, a hob body; 2. a cutting edge; 3. a drive shaft; 4. a key block; 5. a limiting pressure plate; 6. locking the screw; 7. mounting grooves; 8. a compression surface; 9. a guide rod; 10. positioning a rod; 11. a spring; 12. and (4) a top groove.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the worm hob comprises a hob body 1 with a plurality of spiral lines, the multi-start worm hob is suitable for processing worms with more than three heads, a shaft hole is axially formed in the middle of the hob body 1, a plurality of cutting edges 2 are arranged on the hob body 1, the number of the spiral lines is three, the spiral lines are respectively a first spiral line, a second spiral line and a third spiral line, the cutting edges 2 are uniformly distributed along the first spiral line, the second spiral line and the third spiral line, and an oblique cylindrical gear with a large spiral angle is provided, gear teeth of the oblique cylindrical gear are inevitably long and can even be wound around the axis of the oblique cylindrical gear, so that the appearance of the oblique cylindrical gear is changed into a worm-rod-shaped cylindrical gear instead of a common oblique cylindrical gear, and based on the principle, the multi-start worm hob is designed, the worm is used for processing the worm, 15% of processing time can be saved compared with the gear milling processing time under the same condition, and the gear grinding cost is reduced by 20%; as the number of worm heads increases, the time savings and cost reductions become more significant; the shaft hole of hobbing cutter body 1 is equipped with transmission shaft 3, and transmission shaft 3 passes through key block 4 to be connected in the shaft hole (be the key-type connection promptly), and the keyway that supplies key block 4 installation is seted up on the 3 surfaces of transmission shaft, needs to separate hobbing cutter body 1 and transmission shaft 3 at times in the actual process, and for the two separation of convenient messenger fast, the 3 front ends of transmission shaft of being equipped with hobbing cutter body 1 are equipped with quick detach subassembly.

Specifically, the quick-release assembly consists of a limiting pressure plate 5 and a locking screw 6 which can fixedly connect the limiting pressure plate 5 on a transmission shaft 3, the surface of the transmission shaft 3 is provided with a mounting groove 7 which is communicated with a key groove and used for mounting the limiting pressure plate 5, the inner end of the limiting pressure plate 5 is provided with a pressing surface 8 which presses the key groove, the bottom of the limiting pressure plate 5 is provided with two guide rods 9 which are symmetrically arranged and vertically extend outwards, the groove surface of the mounting groove 7 is provided with two guide grooves for guiding the corresponding guide rods 9 to extend into, a positioning rod 10 is arranged in each guide groove, the guide rods 9 are slidably sleeved on the positioning rod 10, the guide rods 9 are inwards provided with sliding grooves for sliding insertion of the positioning rods 10 from the bottoms thereof, and springs 11 are supported and arranged in the sliding grooves and between the positioning rods 10 and the guide rods 9; in addition, the opening depth of the mounting groove 7 is greater than that of the key groove, so that when the locking screw 6 is disassembled, the limiting pressure plate 5 is pressed downwards to press the limiting pressure plate 5 to the deep part of the mounting groove 7, the spring 11 is pressed downwards at the moment, and the limiting pressure plate 5 does not limit the key block 4, so that the key block 4 can be taken out;

after the locking screw 6 is locked, the top end of the spring 11 is pushed upwards to enable the limiting pressure plate 5 to move upwards due to the support of the spring 11, the pressing surface 8 of the limiting pressure plate 5 presses the key block 4 to achieve axial limiting on the key block 4, the pressing strength is caused by the positioning of the guide rod 9, and as long as the best proper pressing position is calculated, a corresponding guide groove is formed, and the key block 4 can be quickly and effectively pressed.

In a further elaboration, the rear end part of the key block 4 is provided with a top groove 12, the limiting pressing plate 5 is pressed down to not generate limiting pressing effect on the key block 4, a top tip or other inner pushing tools are pushed into the top groove 12 to finish the rapid disassembly of the key groove, and the hob body 1 and the transmission shaft 3 can be rapidly separated.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms hob body 1, cutting edge 2, drive shaft 3, key block 4, limit pressure plate 5, locking screw 6, mounting groove 7, pressing surface 8, guide rod 9, positioning rod 10, spring 11, top groove 12, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any one of the additional limitations of the present invention.

Claims

1. A worm hob is characterized by comprising a hob body (1) with a plurality of spiral lines, wherein a shaft hole is axially formed in the middle of the hob body (1), a plurality of cutting edges (2) are arranged on the hob body (1), the number of the spiral lines is three, the spiral lines are respectively a first spiral line, a second spiral line and a third spiral line, the cutting edges (2) are uniformly distributed along the first spiral line, the second spiral line and the third spiral line, a transmission shaft (3) is assembled in the shaft hole of the hob body (1), the transmission shaft (3) is connected in the shaft hole through a key block (4), a key groove for installing the key block (4) is formed in the surface of the transmission shaft (3), and a quick-release assembly is arranged at the front end of the transmission shaft (3) assembled with the hob body (1);

quick detach subassembly constitute by spacing clamp plate (5) and locking screw (6) that can link firmly spacing clamp plate (5) on transmission shaft (3), transmission shaft (3) surface set up with the keyway and communicate with each other and supply mounting groove (7) of spacing clamp plate (5) installation, spacing clamp plate (5) the inner face that compresses tightly (8) that have the keyway to compress tightly, spacing clamp plate (5) bottom guide bar (9) that have two symmetries and set up and outside vertical extension, set up two guide ways that supply corresponding guide bar (9) direction to stretch into on the groove face of mounting groove (7), the guide way in have locating lever (10), guide bar (9) slip cap locate on locating lever (10), guide bar (9) on set up the spout that supplies locating lever (10) slip to insert inwards by its bottom, the spout in and be located between locating lever (10) and guide bar (9) and support and be provided with spring (11).

2. A worm hob according to claim 1, characterized in, that the mounting groove (7) is provided with a greater depth than the keyway.

3. The worm hob according to claim 1, characterized in that the rear end of the key block (4) is provided with a top groove (12).