Adjustable grinding nut

Abstract

The utility model discloses an adjustable grinding nut, and belongs to the technical field of ball screw machining. Comprising a hollow olive-shaped grinding nut, an annular left adjusting ring and an annular right adjusting ring, the ball screw to be ground is sleeved with the grinding nut, and the internal molded surface of the grinding nut is matched with the threaded raceway molded surface of the ball screw to be ground. The left adjusting ring and the right adjusting ring are arranged on an outer conical surface A at the left end of the grinding nut and an outer conical surface B at the right end of the grinding nut in a sleeving mode respectively, grinding pre-tightening force in the circumferential direction is applied to the grinding nut through threaded screwing, and a plurality of elastic contraction grooves are formed in the outer conical surface A and the outer conical surface B of the grinding nut respectively. According to the grinding device and the grinding method, the lead error of the ball screw and the shape error of the thread raceway can be improved, grinding vibration marks on the surface of the thread raceway of the ball screw can be eliminated, the machining precision of the ball screw is further improved, it is guaranteed that a ball screw pair has higher transmission precision and positioning precision, and therefore the defects in the prior art are overcome.

Description

TECHNICAL FIELD

[0001] The utility model relates to an adjustable grinding nut belongs to ball screw processing technical field. BACKGROUND

[0002] Ball screw pair generally by ball screw, ball nut, ball and return ware composition. Ball screw pair is a kind of precision transmission component, which can convert rotary motion into linear motion or convert linear motion into rotary motion. Ball screw pair has the characteristics of high transmission efficiency and accurate positioning, and has very wide application in the fields of aviation, aerospace, precision machine tool and the like.

[0003] With the continuous development of industry 4.0 and intelligent manufacturing, higher requirements are put forward for the transmission accuracy and positioning accuracy of ball screw pair, and the transmission accuracy and positioning accuracy of ball screw pair mainly depend on the machining accuracy of ball screw thread raceway. At present, the machining of ball screw thread raceway is generally as follows: after rough milling thread raceway, surface high-frequency quenching is carried out, and then precise grinding machining of thread raceway is carried out. Since ball screw is a kind of slender shaft part, the rigidity is poor, and elastic deformation is easily generated in the process of precise grinding machining of thread raceway, so that the lead error of ball screw and the shape error of thread raceway cannot be well ensured, and even grinding vibration marks are generated on the surface of thread raceway, thereby affecting the transmission accuracy and positioning accuracy of ball screw pair. SUMMARY

[0004] The utility model discloses a kind of adjustable grinding nuts. The grinding device and grinding method can improve the lead error of ball screw and the shape error of thread raceway, and can eliminate grinding vibration marks on the surface of ball screw thread raceway, further improve the machining accuracy of ball screw, ensure that ball screw pair has higher transmission accuracy and positioning accuracy, so as to overcome the deficiencies of prior art.

[0005] The technical scheme of the utility model discloses a kind of adjustable grinding nuts, including the shape of hollow olive shape's grinding nut and circular ring shape's left adjusting ring and right adjusting ring;Grinding nut is sleeved on the ball screw to be ground, and its internal profile cooperates with the thread raceway profile of the ball screw to be ground;Left adjusting ring and right adjusting ring are respectively sleeved on the outer conical surface A of left end of grinding nut and the outer conical surface B of right end, and by thread screwing, the grinding pre-tightening force in circumferential direction is applied to grinding nut, and a plurality of elastic contraction grooves are respectively arranged on the outer conical surface A and the outer conical surface B of grinding nut.

[0006] In the adjustable grinding nut, the middle convex outer circle of the grinding nut is provided with external threads; the elastic contraction grooves include three or four elastic contraction grooves A provided on the outer conical surface A and three or four elastic contraction grooves B provided on the outer conical surface B, the elastic contraction grooves A and the elastic contraction grooves B are uniformly distributed along the circumferential direction of the outer conical surface and respectively penetrate the barrel wall of the outer conical surface at the left end and the right end of the grinding nut, and the length of the elastic contraction grooves respectively extends from the left end surface and the right end surface of the grinding nut to the undercut groove at the left end surface and the right end surface of the external threads.

[0007] In the adjustable grinding nut, the inner holes of the left adjusting ring and the right adjusting ring are both provided with two sections, one section is an inner conical surface section and the other section is an internal thread section, wherein the inner conical surface section of the left adjusting ring forms the inner conical surface A and the internal thread section is provided with the internal thread A, the inner conical surface section of the right adjusting ring forms the inner conical surface B and the internal thread section is provided with the internal thread B, the taper of the inner conical surface A and the inner conical surface B is the same as the taper of the outer conical surface A and the outer conical surface B of the grinding nut respectively, and the internal thread A and the internal thread B are matched with the external threads of the grinding nut.

[0008] In the adjustable grinding nut, the left adjusting ring and the right adjusting ring are respectively provided with the threaded hole A and the threaded hole B.

[0009] Compared with the prior art, the utility model has the following advantages:

[0010] 1. The design size of the grinding nut and the left and right adjusting rings can be changed to meet the grinding processing of ball screws of different specifications and sizes.

[0011] 2. The taper of the outer conical surface of the grinding nut and the inner conical surface of the left and right adjusting rings can be changed, or the length of the thread connection between the left and right adjusting rings and the grinding nut can be adjusted, so that the grinding pre-tightening force exerted by the left and right adjusting rings on the grinding nut meets the actual grinding needs.

[0012] 3. The taper of the outer conical surface at both ends of the grinding nut or the number or width of the elastic contraction grooves on the outer conical surface at both ends of the grinding nut can be designed to be different values, so that the left and right ends of the grinding nut have different grinding pre-tightening forces.

[0013] 4. The grinding device of the utility model is composed of a grinding nut and left and right adjusting rings, and has a very simple structure and is convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic view of the grinding device of the utility model;

[0015] Figure 2 is a structural schematic view of the grinding nut in the utility model;

[0016] Figure 3 is Figure 2 a left view of the adjustable grinding nut;

[0017] Figure 4 is a structural schematic view of the left adjusting ring in the utility model;

[0018] Figure 5 is a structural schematic view of the right adjusting ring in the utility model.

[0019] Reference signs: 1-grinding nut, 1.1-outer thread, 1.2-outer conical surface A, 1.3-outer conical surface B, 1.4-elastic shrinkage groove A, 1.5-elastic shrinkage groove B, 2-left adjusting ring, 2.1-inner conical surface A, 2.2-inner thread A, 2.3-thread hole A, 3-right adjusting ring, 3.1-inner conical surface B, 3.2-inner thread B, 3.3-thread hole B, 4-ball screw to be ground. DETAILED DESCRIPTION

[0020] The utility model will be further explained in connection with the drawings and examples, but it is not as the basis for limiting the utility model.

[0021] The embodiment of the utility model: a kind of adjustable grinding nut, including the hollow olive shape of shape grinding nut 1, i.e. grinding nut 1 middle size is large, then gradually size reduces to both ends, it further includes circular ring shape left adjusting ring 2 and right adjusting ring 3.Process, grinding nut 1 is sleeved on ball screw to be ground 4, the internal profile of grinding nut 1 is matched with the thread raceway profile of ball screw to be ground;And left adjusting ring 2 and right adjusting ring 3 are respectively sleeved on the outer conical surface of the left end and right end of grinding nut 1, i.e.left adjusting ring 2 is sleeved on the outer conical surface A 1.2 of the left end of grinding nut 1, right adjusting ring 3 is sleeved on the outer conical surface B 1.3 of the right end of grinding nut 1, during the process of sleeve connection, left adjusting ring 2 and right adjusting ring 3 are applied to grinding nut 1 by thread screwing and are applied to the grinding pre-tightening force in circumferential direction, and a plurality of elastic shrinkage grooves are respectively arranged on the outer conical surface A 1.2 and the outer conical surface B 1.3 of grinding nut 1, due to the existence of elastic shrinkage groove, grinding nut 1 occurs shrinkage deformation under the action of extrusion force, so that grinding pre-tightening force changes.

[0022] The middle convex outer circle of the grinding nut 1 is provided with external threads 1.1, the elastic shrinkage grooves include three or four elastic shrinkage grooves A1.4 provided on the outer conical surface A1.2 and three or four elastic shrinkage grooves B1.5 provided on the outer conical surface B1.3, the elastic shrinkage grooves A1.4 are uniformly distributed along the circumferential direction of the outer conical surface A1.2, the elastic shrinkage grooves B1.5 are uniformly distributed along the circumferential direction of the outer conical surface B1.3 and respectively penetrate the barrel wall of the outer conical surface at the left end and the right end of the grinding nut 1, the length of the elastic shrinkage grooves respectively extends from the left end face and the right end face of the grinding nut 1 to the undercut groove at the left end face and the right end face of the external threads 1.1, that is, the length of the elastic shrinkage grooves A1.4 extends from the left end face of the grinding nut 1 to the undercut groove at the left end face of the external threads 1.1, and the length of the elastic shrinkage grooves B1.5 extends from the right end face of the grinding nut 1 to the undercut groove at the right end face of the external threads 1.1.

[0023] The inner holes of the left adjusting ring 2 and the right adjusting ring 3 are both provided with two sections, one section is an inner conical surface section and the other section is an inner thread section. The inner conical surface section of the left adjusting ring 2 forms an inner conical surface A2.1 and the inner thread section is provided with inner threads A2.2; the inner conical surface section of the right adjusting ring 3 forms an inner conical surface B3.1 and the inner thread section is provided with inner threads B3.2. The taper of the inner conical surface A2.1 is the same as the taper of the outer conical surface A1.2 at the left end of the grinding nut 1, and the taper of the inner conical surface B3.1 is the same as the taper of the outer conical surface B1.3 at the right end of the grinding nut 1. The inner threads A2.2 and the inner threads B3.2 cooperate with the external threads 1.1 of the grinding nut 1.

[0024] Taking the left adjusting ring 2 as an example, with the continuous rotation of the left adjusting ring 2, the left adjusting ring 2 moves to the right, the inner conical surface 2.1 of the left adjusting ring 2 continuously extrudes the outer conical surface 1.2 at the left end of the grinding nut 1, and due to the elastic shrinkage grooves A1.4 provided on the outer conical surface 1.2, the grinding nut 1 deforms under the extrusion force of the left adjusting ring 2, so that the grinding pre-tightening force changes. When the stepped surface of the inner thread section of the left adjusting ring 2 contacts the left end face of the middle convex outer circle part of the grinding nut 1, the left adjusting ring 2 moves to the maximum stroke and cannot continue to move to the right. Since the length of the elastic shrinkage grooves A1.4 extends from the left end face of the grinding nut 1 to the undercut groove at the left end face of the external threads 1.1, it can be ensured that during the movement of the left adjusting ring 2 to the maximum stroke, the deformation of the grinding nut 1 can be realized by the movement of the left adjusting ring 2, so as to change the grinding pre-tightening force.

[0025] The left adjusting ring 2 is provided with a threaded hole A2.3 and the right adjusting ring 3 is provided with a threaded hole B3.3,

[0026] The threaded hole A2.3 and the threaded hole B3.3 can be used to rotate the handle with external threads, so as to facilitate the rotation of the left adjusting ring 2 and the right adjusting ring 3 and the adjustment of the rotation of the threaded connection between them and the grinding nut 1.

[0027] The grinding method of the adjustable grinding nut comprises the following operation steps:

[0028] Step 1: screw the grinding nut 1 into the ball screw 4 to be ground;

[0029] Step 2: respectively sleeve the left adjusting ring 2 and the right adjusting ring 3 on the outer conical surface of the left end and the right end of the grinding nut 1, and complete the assembly through threaded rotation;

[0030] Step 3: apply the grinding agent on the ball screw 4 to be ground;

[0031] Step 4: adjust the size of the grinding pre-tightening force applied by the left adjusting ring 2 and the right adjusting ring 3 to the grinding nut 1 by adjusting the length of the threaded rotation of the left adjusting ring 2 and the right adjusting ring 3 to the grinding nut 1;

[0032] Step 5: keep the ball screw 4 to be ground or the grinding device stationary, and rotate the grinding device or the ball screw 4 to be ground relative to the ball screw 4 to be ground or the grinding device, so as to realize the grinding processing of the ball screw 4 to be ground when the grinding nut 1 rotates to the position coated with the grinding agent.

Claims

1. An adjustable truing nut, characterized by: The application relates to a grinding nut (1) with a hollow olive shape and left and right adjusting rings (2 and 3) with a circular ring shape; the grinding nut (1) is sleeved on a ball screw (4) to be ground, the inner profile of the grinding nut (1) is matched with the thread raceway profile of the ball screw (4) to be ground; the left and right adjusting rings (2 and 3) are respectively sleeved on the outer conical surface A (1.2) at the left end and the outer conical surface B (1.3) at the right end of the grinding nut (1), the grinding nut (1) is subjected to the circumferential direction grinding pre-tightening force by screwing, and a plurality of elastic contraction grooves are respectively arranged on the outer conical surface A (1.2) and the outer conical surface B (1.3) of the grinding nut (1).

2. An adjustable truing nut as claimed in claim 1 wherein: The outer thread (1.1) is arranged on the middle protruding outer circle of the grinding nut (1); the elastic contraction grooves include three or four elastic contraction grooves A (1.4) arranged on the outer conical surface A (1.2) and three or four elastic contraction grooves B (1.5) arranged on the outer conical surface B (1.3), the elastic contraction grooves A (1.4) and the elastic contraction grooves B (1.5) are uniformly distributed along the circumferential direction of the outer conical surface, and respectively penetrate the cylinder wall of the outer conical surface at the left end and the right end of the grinding nut (1), and the length of the elastic contraction grooves respectively extends from the left end surface and the right end surface of the grinding nut (1) to the left end surface and the right end surface of the undercut groove of the outer thread (1.1).

3. An adjustable truing nut as claimed in claim 2 wherein: The inner holes of the left and right adjusting rings (2 and 3) are both provided with two sections, one section is an inner conical surface section, and the other section is an inner thread section, wherein the inner conical surface section of the left adjusting ring (2) forms the inner conical surface A (2.1), and the inner thread section is provided with the inner thread A (2.2), the inner conical surface section of the right adjusting ring (3) forms the inner conical surface B (3.1), and the inner thread section is provided with the inner thread B (3.2), the taper of the inner conical surface A (2.1) and the inner conical surface B (3.1) is the same as that of the outer conical surface A (1.2) and the outer conical surface B (1.3) of the grinding nut (1), and the inner thread A (2.2) and the inner thread B (3.2) are matched with the outer thread (1.1) of the grinding nut (1).

4. An adjustable truing nut as claimed in claim 1 wherein: The left and right adjusting rings (2 and 3) are respectively provided with the threaded hole A (2.3) and the threaded hole B (3.3).

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