CN210849863U

CN210849863U - Small-bore nut slot machining cutter

Info

Publication number: CN210849863U
Application number: CN201921861628.5U
Authority: CN
Inventors: 刘德华; 钱钢
Original assignee: Jiaxing Meiwuda Precision Machinery Co ltd
Current assignee: Jiaxing Meiwuda Precision Machinery Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-06-26
Anticipated expiration: 2029-10-31

Abstract

The utility model provides a small-bore nut slot machining cutter, by the back before by in proper order by first, the second handle of a knife constitutes, the rear portion of first handle of a knife is used for being connected with the lathe chuck, the front portion of first handle of a knife and the rear portion fixed connection of second handle of a knife, the external diameter of second handle of a knife equals with the inner chamber diameter of pre-grinding nut, is equipped with spiral grinding profile tooth along self axis direction on the periphery wall of second handle of a knife, spiral grinding profile tooth is used for carrying out the grinding to the nut slot after the turning. The utility model discloses it is first, original handle of a knife is replaced to the second handle of a knife, replace original grinding dish with the spiral grinding shaping tooth on the second handle of a knife periphery wall, the diameter of the relative grinding dish of size of spiral grinding shaping tooth is very little, thereby make the outer diameter of second handle of a knife can be done equally big with the inner chamber diameter of pre-grinding nut, and then strengthen the intensity when processing small-bore nut greatly, moreover, behind the inner chamber that spiral grinding shaping tooth spiral inserted the nut, only need once just can accomplish the slot grinding, and is efficient.

Description

Small-bore nut slot machining cutter

Technical Field

The utility model relates to a cutter is used in nut processing, specifically says a small-bore nut slot machining cutter.

Background

In a transmission system of an industrial robot, a ball screw pair is generally used to transmit linear motion. The existing ball screw assembly generally comprises a screw rod, a nut, a steel ball, a preforming piece, an inverter and a dust keeper, wherein the steel ball is positioned in a groove formed between the nut and the screw rod, so that during movement, sliding friction is replaced by rolling friction, and the technical problems that the prior screw assembly is poor in positioning and easy to damage are solved.

The nut is a core member of the ball screw assembly, and it is necessary to perform high-precision grinding after turning of a groove (female thread) thereof. For the nut with large caliber, the diameter of the inner cavity is larger, and the handle of the grinding tool is correspondingly thicker, so that the problem can not occur during grinding; when the specification of the nut is small, if the diameter of the inner cavity of the nut is only 8mm, the handle of the grinding tool becomes very thin, when the handle with the grinding disc at the front part is inserted into the inner cavity of the nut to grind the groove, the handle is easy to bend and deform, so that the grinding machining is difficult, and even if the grinding precision of the groove can meet the requirement finally, the machining efficiency is very low.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a small-bore nut slot machining cutter, it can not only carry out abrasive machining to the nut slot, makes its precision reach the requirement, and machining efficiency is high moreover.

The technical solution of the utility model is that, a small-bore nut slot machining cutter with following structure is provided, comprises first handle of a knife and second handle of a knife forward in proper order after by, the rear portion of first handle of a knife is used for being connected with the lathe chuck, the front portion of first handle of a knife and the rear portion fixed connection of second handle of a knife, the external diameter of second handle of a knife equals with the inner chamber diameter of grinding nut in advance, is equipped with spiral grinding shaping tooth along self axis direction on the periphery wall of second handle of a knife, spiral grinding shaping tooth is used for carrying out the grinding to the nut slot after the turning.

A small-bore nut slot machining cutter, wherein, set up the open slot that runs through along self radial direction on the outer wall of second handle of a knife, the axial length of open slot equals with the axial length of spiral grinding profile tooth at least.

A small-bore nut slot machining cutter, wherein, the shrinkage pool has been seted up on the second handle of a knife of open slot both sides, spiral reset spring is equipped with in the shrinkage pool, be equipped with two semi-circular bosss on the preceding lateral wall of second handle of a knife, two semi-circular bosss are located the both sides of open slot respectively, and the diameter that two semi-circular bosss enclose is less than the diameter of second handle of a knife, all is equipped with the arc draw-in groove between the preceding lateral wall of each semi-circular boss and second handle of a knife, is equipped with the jump ring in two arc draw-in grooves.

A small-bore nut slot machining cutter, wherein, the front portion of first handle of a knife indicates with the rear portion fixed connection of second handle of a knife, the rear portion of second handle of a knife is equipped with square convex part, square convex part male square groove of confession has been seted up to the front portion of first handle of a knife, compression screw is equipped with on the lateral wall in square groove.

After the structure more than adopting, compare with prior art, the utility model relates to a small-bore nut slot machining cutter has following advantage: compared with the prior art, the structure of the knife handle and the grinding disc is adopted to grind the turned nut groove, so that the knife handle can become very thin when the diameter of the inner cavity of the nut is reduced to 8mm, thereby being very easy to bend and deform during processing, and influencing the grinding precision and the processing efficiency, the utility model improves the prior processing cutter, replaces the prior knife handle with the first knife handle and the second knife handle, replaces the prior grinding disc with the spiral grinding forming teeth arranged on the outer peripheral wall of the second knife handle, the size of the spiral grinding forming teeth is very small relative to the diameter of the grinding disc, thereby the outer diameter of the second knife handle can be made as large as the diameter of the inner cavity of the pre-grinding nut, further greatly enhancing the strength of the knife handle during grinding, and the groove can be ground only once after the spiral grinding forming teeth are inserted into the inner cavity of the nut, repeated grinding along the axis of the nut is not required. To sum up, the utility model discloses not only can carry out abrasive machining to the nut slot, make its precision reach the requirement, machining efficiency is very high relatively moreover.

Drawings

Fig. 1 is a three-dimensional structure diagram of the small-caliber nut groove processing tool of the utility model;

FIG. 2 is a longitudinal sectional structural view of FIG. 1;

fig. 3 is a three-dimensional structure diagram of the present invention when grinding nut grooves.

Detailed Description

The following provides a further detailed description of the small-caliber nut groove processing tool according to the present invention with reference to the accompanying drawings:

as shown in fig. 1, 2 and 3, in the present embodiment, the utility model relates to a small-bore nut groove processing tool, which comprises a first tool shank 10 and a second tool shank 11 sequentially from back to front, wherein the rear part of the first tool shank 10 is used for connecting with a lathe chuck, and the front part of the first tool shank 10 is fixedly connected with the rear part of the second tool shank 11; the outer diameter of the second tool holder 11 is equal to the diameter of the inner cavity of the pre-grinding nut 20; the outer peripheral wall of the second tool holder 11 is provided with spiral grinding forming teeth 112 along the axis direction; the helical grinding-forming teeth 112 are integral with the second tool shank 11 and are used for grinding the turned nut grooves (internal threads).

The front part of the first tool handle 10 is fixedly connected with the rear part of the second tool handle 11, and the structure is as follows: the rear part of the second tool shank 11 is provided with a square convex part 116, the front part of the first tool shank 10 is provided with a square groove 102 for the square convex part 116 to insert, and the side wall of the square groove 102 is provided with a compression screw 14 through a screw hole 101. The second shank 11 can be securely connected to the first shank 10 by screwing the compression screw 14.

The outer wall of the second tool holder 11 is provided with a through opening groove 111 along the radial direction, and the axial length of the opening groove 111 is at least equal to that of the spiral grinding forming teeth 112. Therefore, the elasticity of the second tool handle 11 can be effectively enhanced, namely, when the reserved machining allowance of the inner cavity groove of the nut 20 is slightly larger due to lathe errors and the like, the front part of the second tool handle 11 is properly shrunk inwards at the moment of inserting the groove, so that the excessive machining allowance is avoided and subjected to tapered grinding. The tapered grinding is to grind away some excess of the groove from the front part of the second tool shank 11, and then grind the middle part and the rear part of the spiral grinding forming tooth 112 inserted into the groove, so that the structure is finally qualified, and the structure can effectively prevent the second tool shank 11 from twisting off when the machining allowance of the groove is too large.

Concave holes 115 are formed in the second tool holder 11 on two sides of the open groove 111, a spiral return spring 12 is arranged in the concave holes 115, two semicircular bosses 114 are arranged on the front side wall of the second tool holder 11, the two semicircular bosses 114 are respectively located on two sides of the open groove 111, and the diameter enclosed by the two semicircular bosses 114 is smaller than that of the second tool holder 11 so as to prevent the interference of the two semicircular bosses to the groove; arc-shaped clamping grooves 113 are formed between each semicircular boss 114 and the front side wall of the second tool handle 11, and clamping springs 13 are arranged in the two arc-shaped clamping grooves 113. The clamp spring 13 mainly plays a limiting role, and prevents the front part of the second tool shank 11 from being opened towards two sides too much under the action of machining stress due to machining errors of the open slot 111. The return springs 12 have three sets, and when the opening grooves 111 are contracted, the quick return function is realized.

The utility model discloses spiral grinding profile tooth 112 that will set up on the outer peripheral wall of second handle of a knife 11 replaces original grinding dish, spiral grinding profile tooth 112's the diameter of the relative grinding dish of size is very little, thereby make the external diameter of second handle of a knife 11 can be done equally big with the inner chamber diameter of pre-grinding nut 20, and then handle of a knife intensity when strengthening the grinding greatly, moreover, behind spiral grinding profile tooth 112 spiral insert nut 20's inner chamber, only need once just can accomplish the slot grinding, need not to relapse the axis grinding along the nut, machining efficiency is very high.

The above-mentioned embodiments are only described for the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and the technical solution of the present invention is not limited by the above-mentioned embodiments, and various modifications and improvements made by those skilled in the art can be made without departing from the spirit of the present invention.

Claims

1. The utility model provides a small-bore nut slot machining cutter which characterized in that: constitute by first handle of a knife (10) and second handle of a knife (11) in proper order backward forward, the rear portion of first handle of a knife (10) is used for being connected with the lathe chuck, the front portion of first handle of a knife (10) and the rear portion fixed connection of second handle of a knife (11), the external diameter of second handle of a knife (11) equals with the inner chamber diameter of grinding nut (20) in advance, is equipped with spiral grinding profile tooth (112) along self axis direction on the periphery wall of second handle of a knife (11), spiral grinding profile tooth (112) are used for grinding the nut slot after the turning.

2. The small-caliber nut groove machining tool according to claim 1, characterized in that: the outer wall of the second cutter handle (11) is provided with a through open slot (111) along the radial direction, and the axial length of the open slot (111) is at least equal to that of the spiral grinding forming teeth (112).

3. The small-caliber nut groove machining tool according to claim 2, characterized in that: shrinkage pool (115) have been seted up on second handle of a knife (11) of open slot (111) both sides, spiral reset spring (12) are equipped with in shrinkage pool (115), be equipped with two semi-circular bosss (114) on the preceding lateral wall of second handle of a knife (11), two semi-circular bosss (114) are located the both sides of open slot (111) respectively, and the diameter that two semi-circular bosss (114) enclose is less than the diameter of second handle of a knife (11), all is equipped with arc draw-in groove (113) between the preceding lateral wall of each semi-circular boss (114) and second handle of a knife (11), is equipped with jump ring (13) in two arc draw-in grooves (113).

4. The small-caliber nut groove machining tool according to claim 3, wherein: the front part of the first knife handle (10) is fixedly connected with the rear part of the second knife handle (11), a square convex part (116) is arranged at the rear part of the second knife handle (11), a square groove (102) for the square convex part (116) to insert into is formed in the front part of the first knife handle (10), and a compression screw (14) is arranged on the side wall of the square groove (102).