A positioning tooling for machining a nut of a ball screw pair

Abstract

The present invention relates to a positioning tooling for machining a nut of a ball screw pair, which comprises a fixing frame, a pressing head slidably connected to the fixing frame, and a measuring head fixedly arranged on the fixing frame. The pressing head and the measuring head are oppositely arranged on the same straight line, and a span is formed between the pressing head and the measuring head. A ball head matching the thread raceway of the nut of the ball screw pair is arranged at the end of the measuring head. The fixing frame straddles the side wall of the nut of the ball screw pair, and one end of the measuring head provided thereon extends into the interior of the nut of the ball screw pair. The measuring head is slidably connected in the thread raceway, and the pressing head abuts against the outer wall of the nut of the ball screw pair. The present invention takes the thread raceway as the reference for positioning, and can quickly position the position corresponding to the internal raceway of the nut on the outer circumferential surface of the nut, thereby improving both the positioning efficiency and the accuracy.

Description

Technical Field

[0001] The present invention relates to a positioning tooling for machining a nut of a ball screw pair, belonging to the technical field of machining a nut of a ball screw pair. Background Art

[0002] The nut structure of a ball screw pair includes an internal thread raceway and some primitive elements in the circumferential direction of its outer diameter, such as key grooves, mounting holes, oil holes, etc.; the positional relationship of the primitive elements is often related to the raceway. For example, the oil hole needs to communicate with the crown of the raceway to accurately lubricate the balls; thus, during the machining process, it is necessary to repeatedly set the tool to confirm the phase relationship between the oil hole and the raceway, which is time-consuming and laborious. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a positioning tooling for machining a nut of a ball screw pair, which positions the raceway on the outer wall of the nut of the ball screw pair.

[0004] To achieve the above object, the technical solution proposed by the present invention is: a positioning tooling for machining a nut of a ball screw pair, including a fixed frame, a pressing head slidably connected to the fixed frame, and a measuring head fixedly arranged on the fixed frame. The pressing head and the measuring head are oppositely arranged on the same straight line, and a span is formed between the pressing head and the measuring head; a ball head matching the thread raceway of the nut of the ball screw pair is provided at the end of the measuring head.

[0005] The fixed frame straddles the side wall of the nut of the ball screw pair, and one end of the measuring head is provided to extend into the inside of the nut of the ball screw pair. The measuring head is slidably connected in the thread raceway, and the pressing head abuts against the outer wall of the nut of the ball screw pair.

[0006] For further design of the above technical solution: a sliding hole is provided on the fixed frame corresponding to the pressing head, and a notch communicating with the sliding hole is provided at the middle part corresponding to the sliding hole. An adjusting nut is provided in the notch. An external thread is provided on the outer wall of the pressing head, and the pressing head is screwed to the adjusting nut through the external thread.

[0007] A locking screw hole communicating with the sliding hole is provided on the fixed frame. A locking screw is screwed in the locking screw hole. A chute is provided on the outer wall of the pressing head along the length direction of the pressing head; the end of the locking screw extends into the chute and is slidably connected to the chute. By screwing the locking screw, the end of the locking screw tightly abuts against the inner wall of the chute.

[0008] Both ends of the pressing head extend out of the sliding hole, and the width of the notch is greater than the thickness of the adjusting nut.

[0009] An installation screw hole is provided on the fixed frame corresponding to the measuring head. An external thread is provided on the outer wall of the end of the measuring head away from the ball head, and the measuring head is screwed into the installation screw hole through the external thread.

[0010] A positioning plate with a setting direction perpendicular to the setting direction of the probe is provided near the spherical head of the probe, and the side of the positioning plate facing the spherical head is an arc surface matching the inner wall of the nut of the ball screw pair.

[0011] A hollow structure is provided in the upper part of the fixing frame.

[0012] The beneficial effects of the present invention are as follows:

[0013] In the present invention, the probe is placed inside the nut of the ball screw pair, the spherical head slides in the thread raceway, and then the pressure head is adjusted to move towards the nut of the ball screw pair until it abuts against the outer wall of the nut of the ball screw pair. Since the probe and the pressure head are on the same straight line, the position where the end of the pressure head abuts at this time is the position corresponding to the thread raceway. The present invention uses the thread raceway as a reference for positioning, and can quickly position the position corresponding to the inner raceway of the nut on the outer circumference of the nut, which improves both the positioning efficiency and the accuracy.

[0014] In the present invention, a positioning plate is provided near the spherical head of the probe. During use, the positioning plate is attached to the inner wall of the nut of the ball screw pair, so that the straight line where the probe and the pressure head are located is always perpendicular to the axis of the nut of the ball screw pair, making the positioning more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the positioning tooling in the first embodiment of the present invention;

[0016] Figure 2 is Figure 1 a schematic structural diagram of the fixing frame in

[0017] Figure 3 is Figure 1 a schematic structural diagram of the pressure head in

[0018] Figure 4 is Figure 1 a schematic structural diagram of the probe in

[0019] Figure 5 is Figure 1 a schematic diagram of the usage state of

[0020] Figure 6 is Figure 2 a cross-sectional view of

[0021] Figure 7 is a cross-sectional view of the usage state of the positioning tooling in the second embodiment of the present invention.

[0022] In the figure: 1 - fixing bracket, 11 - hollow structure, 12 - sliding hole, 13 - mounting screw hole, 14 - locking screw hole, 15 - notch, 2 - pressing head, 21 - pressing head tip, 22 - sliding groove, 3 - adjusting nut, 4 - locking screw, 5 - measuring head, 51 - ball head, 52 - threaded part, 53 - positioning plate, 6 - nut to be measured, 7 - positioning line. Embodiment

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Embodiment 1

[0024] As Figure 1 shown, a positioning tooling for machining and positioning a nut of a ball screw pair in this embodiment is used to position a position corresponding to a thread raceway on the outer wall of the nut to be measured of the ball screw pair.

[0025] The positioning tooling includes a fixing bracket 1, a pressing head 2 slidably connected to the fixing bracket 1, and a measuring head 5 fixedly arranged on the fixing bracket 1. A cross - spanning part is provided in the middle of the fixing bracket 1. The pressing head 2 and the measuring head 5 are respectively arranged at both ends of the cross - spanning part, and the pressing head 2 and the measuring head 5 are oppositely arranged on the same straight line.

[0026] Combined with Figure 2 shown, a hollow structure 11 is provided on the upper part of the fixing bracket 1. A sliding hole 12 is provided on the fixing bracket 1 corresponding to the pressing head 2, and a notch 15 communicating with the sliding hole 12 is provided corresponding to the middle of the sliding hole 12. An adjusting nut 3 is provided in the notch 15. Combined with Figure 3 shown, an external thread is provided on the outer wall of the pressing head 2, and the pressing head 2 is screwed to the adjusting nut 3 through the external thread. A locking screw hole 14 communicating with the sliding hole 12 is also provided on the fixing bracket 1. A locking screw 4 is screwed in the locking screw hole 14. A sliding groove 22 is provided on the outer wall of the pressing head 2 along the length direction of the pressing head. The end of the locking screw 4 extends into the sliding groove 22 and is slidably connected to the sliding groove 22.

[0027] When the adjusting nut 3 is rotated, since the end of the locking screw 4 extends into the sliding groove 22 to form a limiting structure, the pressing head 2 is restricted by the locking screw 4 and cannot rotate, but can only reciprocate along the length direction of the sliding hole 12.

[0028] Combined with Figure 4 shown, a mounting screw hole 13 is provided on the fixing bracket 1 corresponding to the measuring head 5. One end of the measuring head 5 is provided with a ball head 51 matching the thread raceway of the nut to be measured, and the other end away from the ball head is a threaded part 52 with an external thread, and the measuring head 5 is fixedly screwed to the fixing bracket 1 through the threaded part and the mounting screw hole.

[0029] Combined with Figure 5 and Figure 6As shown in the figure, when the positioning tooling of this embodiment is in use, a positioning line 7 can be drawn on the circumference of the nut 6 to be measured in advance using a lathe tool or other scribing tools; the spanning part of the fixing frame 1 is spanned on the side wall of the nut 6 to be measured, and one end of the measuring head 5 extends into the nut 6 to be measured, and the ball head 51 is embedded in the thread raceway. Rotate the adjusting nut 3 to move the pressing head 2 towards the nut 6 to be measured until the pressing tip 21 at one end of the pressing head 2 approaches the outer wall of the nut 6 to be measured; then rotate the positioning tooling along the circumferential direction of the nut 5 to be measured, so that the ball head 51 slides along the thread raceway and continuously slides into the nut 5 to be measured until the pressing tip 21 touches the positioning line 7, and then toggle the adjusting nut 3 to make the pressing tip 21 tightly press against the outer circumferential surface of the nut 6 to be measured. At this time, the locking screw 4 can be selected to be screwed so that the end of the locking screw 4 tightly presses against the inner wall of the chute 22 to lock the pressing head 2 and make the position of the pressing head 2 and the sliding hole 12 relatively fixed.

[0030] Since both ends of the pressing head 2 extend out of the sliding hole and the width of the notch 15 is slightly larger than the thickness of the adjusting nut 3, the adjusting nut 3 can move slightly along the moving direction of the pressing head 2 in the notch 15. After the pressing tip 21 tightly presses against the outer circumferential surface of the nut 6 to be measured, instead of screwing the locking screw 4, a tool can be used to strike the end of the pressing head 2 away from the pressing tip to punch a positioning point on the outer circumferential surface of the nut 6 to be measured. The positioning point is the target position. If an oil hole is machined from here, it can be directly opposite to the raceway, and it can also be used as a relative positioning for other machining positions. Then the positioning tooling can be removed. Thus, positioning is based on the thread raceway, and the position corresponding to the inner raceway of the nut can be quickly and accurately positioned on the outer circumferential surface of the nut to be measured. Embodiment 2

[0031] The positioning tooling of this embodiment is basically the same as that of Embodiment 1, except that: a positioning plate 53 with a setting direction perpendicular to the setting direction of the measuring head 5 is provided near the ball head 51 of the measuring head 5, and the arc surface matching the inner wall of the nut of the ball screw pair is on the side of the positioning plate 53 facing the ball head.

[0032] Combined Figure 7 As shown in the figure, when in use, the ball head 51 is embedded in the threaded pipe, and the positioning plate 53 fits the inner wall of the nut 6 to be measured, so that the ball head 51 slides along the thread raceway. At this time, the positioning plate 53 also slides along the inner wall of the nut 6 to be measured, so that the positioning tooling will not tilt. Since the setting direction of the positioning plate 53 is perpendicular to the setting direction of the measuring head 5, the straight line where the measuring head 5 and the pressing head 2 are located is always perpendicular to the axial direction of the nut of the ball screw pair, and the positioning is more accurate.

[0033] The technical solutions of the present invention are not limited to the above embodiments, and all technical solutions obtained by using equivalent replacement methods fall within the scope of protection required by the present invention.

Claims

1. A positioning tooling for machining a ball screw pair nut, comprising a fixing bracket, characterized in that: It further includes a pressure head slidably connected to the fixed frame and a probe fixedly arranged on the fixed frame. The pressure head and the probe are relatively arranged on the same straight line, and a span is formed between the pressure head and the probe; a ball head matching the thread raceway of the nut of the ball screw pair is provided at the end of the probe. The fixed frame straddles the side wall of the nut of the ball screw pair, and one end of the probe extends into the inside of the nut of the ball screw pair. The probe is slidably connected in the thread raceway. One end of the pressure head is provided with a pressure head tip, and the pressure head tip abuts against the outer wall of the nut of the ball screw pair. The position where the pressure head tip abuts against the outer wall of the nut of the ball screw pair is the position corresponding to the outer circumferential surface of the nut of the ball screw pair and the internal raceway of the nut of the ball screw pair.

2. The positioning tooling for machining the nut of the ball screw pair according to claim 1, characterized in that: A sliding hole is provided in the fixed frame at the position corresponding to the pressure head, and a notch communicating with the sliding hole is provided at the position corresponding to the middle of the sliding hole. An adjusting nut is arranged in the notch. The outer wall of the pressure head is provided with an external thread and is screwed with the adjusting nut through the external thread.

3. The positioning fixture for machining the nut of the ball screw pair according to claim 2, characterized in that: A locking screw hole communicating with the sliding hole is provided on the fixed frame, and a locking screw is screwed in the locking screw hole. A chute is arranged on the outer wall of the pressure head along the length direction of the pressure head; the end of the locking screw extends into the chute and is slidably connected with the chute. By screwing the locking screw, the end of the locking screw tightly abuts against the inner wall of the chute.

4. The positioning tooling for machining the ball screw pair nut according to claim 3, characterized in that: Both ends of the pressure head extend out of the sliding hole, and the width of the notch is greater than the thickness of the adjusting nut.

5. The positioning fixture for machining the nut of the ball screw pair according to claim 1, wherein: An installation screw hole is provided in the fixed frame at the position corresponding to the probe. The outer wall of the probe at the end far from the ball head is provided with an external thread and is screwed into the installation screw hole through the external thread.

6. The positioning fixture for machining the nut of the ball screw pair according to claim 5, characterized in that: A positioning plate is provided at the position of the probe close to the ball head, and the setting direction of the positioning plate is perpendicular to the setting direction of the probe. The side of the positioning plate facing the ball head is an arc surface matching the inner wall of the nut of the ball screw pair.

7. The positioning tooling for processing the ball screw pair nut according to claim 1, characterized in that: A hollow structure is provided at the upper part of the fixed frame.

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