Ball nut internal thread bent rod grinding system device and assembling process

Abstract

The invention discloses a ball nut internal thread bent rod grinding system device and an assembling technology, and relates to the technical field of ball nut internal thread grinding, the ball nut internal thread bent rod grinding system device comprises a machine body, a chuck rotationally arranged on the machine body and a grinding assembly, and further comprises an adjusting assembly, and the adjusting assembly comprises a supporting plate arranged on the chuck; the two clamping plates are symmetrically arranged on the supporting plate and are in elastic sliding connection with the supporting plate, and the two clamping plates are used for clamping the ball nut from the two sides when the ball nut is placed; the adjusting plate is located behind the clamping plate and elastically and slidably connected with the supporting plate. By adjusting the ball nut through the adjusting plate, no matter how the specification of the nut changes, it can be guaranteed that the front end and the rear end of the flange part of the nut make close contact with the clamping plate and the push plate, it is guaranteed that the axial and radial position heights of the flange parts of the nuts in the same batch are consistent, then the distance between the front end of the nut and a grinding wheel is constant, and it is guaranteed that the grinding feeding path is unified.

Description

Technical Field

[0001] The invention relates to the technical field of ball nut internal thread grinding, in particular to a ball nut internal thread bent rod grinding system device and an assembly process. Background Art

[0002] In the traditional process of grinding the internal threads of ball nuts, a three-jaw chuck is used to secure the workpiece. The chuck then drives the workpiece in an axial feed and rotates to achieve full-circumference grinding of the inner hole. However, the chuck clamping process in the existing technology has inherent defects such as axial positioning deviation of the workpiece, which are specifically manifested as follows:

[0003] 1. Errors occur in the clamping process due to randomness;

[0004] During clamping, the operator needs to manually lift the ball nut to the center of the chuck. The initial position and tilt angle of the workpiece are random. When the jaws clamp the workpiece by radial contraction, although the coaxiality can meet the requirements, the axial fit between the workpiece end face and the chuck reference surface cannot be guaranteed, resulting in discrete axial positions of different workpieces after clamping. Figure 1 As shown in a, in the ideal clamping state, the distance between the front end of the workpiece and the grinding wheel is L1, the distance between the rear end and the chuck is L0, and the overall axial travel is L; in actual clamping:

[0005] like Figure 1 As shown in Figure b, if the distance between the workpiece and the chuck reference plane increases to L2 (L2>L0), the front end distance from the grinding wheel is shortened to L3 (L3<L1), and the overall stroke becomes L4 (L4<L). At this time, when the grinding wheel is fed according to the preset stroke L, the grinding force will suddenly change due to the instantaneous increase in cutting depth, resulting in "bites" on the thread profile and deterioration of the surface roughness (increase in Ra value), accompanied by problems such as tooth profile angle deviation and pitch error. In severe cases, it may cause the ball motion to stagnate.

[0006] like Figure 2 As shown in the figure, if the distance between the rear end of the workpiece and the chuck is reduced to L5 (L5<L0), the distance between the front end and the grinding wheel becomes L6 (L6>L1), and the overall stroke is shortened to L7 (L7<L), the grinding end point of the grinding wheel will be insufficient, resulting in insufficient effective length of the thread, which directly affects the subsequent assembly accuracy.

[0007] 2. Chain degradation of machining accuracy;

[0008] Axial position deviation will lead to uneven axial feed of the grinding wheel. When the front end of the workpiece is positioned backward, the axial movement distance of the grinding wheel is shortened. If the feed end point is fixed, it is easy to cause insufficient grinding of the rear end of the workpiece. On the contrary, if the front end is positioned forward, it may cause vibration due to sudden change in cutting depth, aggravating the deterioration of the inner hole surface quality, and forming a taper error of "small front diameter and large rear end diameter", and cylindricity tolerance. Summary of the Invention

[0009] The purpose of the present invention is to provide a ball nut internal thread bent rod grinding system device and assembly process to solve the problems raised in the above background technology.

[0010] To achieve the above-mentioned object, the present invention provides the following technical solution: a ball nut internal thread bent rod grinding system device, comprising a body, a chuck rotatably disposed on the body, and a grinding assembly, and also comprising an adjustment assembly, wherein the adjustment assembly comprises:

[0011] A support plate is provided on the chuck;

[0012] Two clamping plates are symmetrically arranged on the support plate and are elastically slidably connected to the support plate. The two clamping plates are used to clamp the ball nut from both sides when it is placed;

[0013] An adjusting plate is located behind the clamping plate and is elastically and slidably connected to the supporting plate;

[0014] A push plate is elastically and slidably connected to the support plate and is located above the adjustment plate. When the ball nut is placed on the adjustment plate, the angle of the flange of the ball nut is adjusted by contact with the adjustment plate, and then the ball nut is pushed by the push plate to contact the rear side wall of the clamping plate;

[0015] The driving assembly is used to control the different heights of the support plate on the chuck according to the relative movement distance of the two clamping plates, so that the center points of ball nuts of different sizes are coaxial with the center point of the chuck.

[0016] As a further solution of the present invention, the driving assembly includes a positioning rod fixedly connected to the chuck and a sliding rod, the sliding rod is slidably connected to the support plate, the sliding rod is rotatably connected to a support rod, the bottom end of the support rod is rotatably connected to the clamping plate, and when the clamping plate slides, the support rod pushes the sliding rod to move so that the horizontal portion of the sliding rod and the center point of the ball nut are at the same height;

[0017] It also includes a linear drive group, which is used to drive the support plate to move until the sliding rod contacts the positioning rod and stops.

[0018] As a further solution of the present invention, the linear drive assembly includes a telescopic part 1 fixedly connected to the chuck, the telescopic end of the telescopic part 1 is slidably connected to the support plate, and a first spring is fixedly connected between the telescopic end of the telescopic part 1 and the support plate.

[0019] As a further solution of the present invention, the two clamping plates are fixedly connected to a first rack rod, a first gear is meshed between the two first rack rods, and the first gear is rotatably connected to the support plate.

[0020] As a further solution of the present invention, a cross bar is slidably connected to the support plate, the cross bar is rotatably connected to the flat plate, a torsion spring is sleeved on the rotating shaft of the flat plate, and a telescopic member 2 is fixedly connected between the cross bar and the support plate.

[0021] As a further solution of the present invention, two second rack rods are elastically and slidingly connected to the cross bar, the two second rack rods are symmetrically arranged about the cross bar, the two second rack rods are engaged with second gears, the second gears are respectively rotatably connected to the two splints, and the second gears are fixedly connected to the baffle.

[0022] As a further solution of the present invention, the grinding assembly includes a base plate, which is slidably connected to the machine body, and a fixed seat is slidably connected to the base plate, and a motor is fixedly connected to the fixed seat, and the motor is fixedly connected to a housing, and the housing is threadedly connected to the main shaft by bolts, and the main shaft is fixedly connected to a grinding connecting rod, and a hose is provided inside the grinding connecting rod, and a steel wire flexible shaft is provided inside the hose, one end of the steel wire flexible shaft slides inside the output end of the motor and is abutted by a bolt, and the other end of the steel wire flexible shaft is fixedly connected to a screw, a gasket is threadedly connected to the screw, a grinding wheel is provided on the gasket, the grinding wheel is tilted, and a nut is threaded on the gasket.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention adjusts the ball nut through the adjustment plate. No matter how the nut specifications change, it can ensure that the front and rear ends of the flange are in close contact with the clamping plate and the push plate, and ensure that the axial and radial positions of the flanges of the nuts of the same batch are highly consistent, thereby making the distance between the front end of the nut and the grinding wheel constant, ensuring a uniform grinding feed path, and eliminating the need to adjust the grinding feed path multiple times. The problem of random clamping errors and degradation of machining accuracy is eliminated from the root, and defects such as inconsistent effective thread length, tooth profile accuracy deviation and excessive inner hole cylindricity are avoided.

[0025] 2. When positioning flanges of different shapes, it can avoid dependence on edge references, thereby reducing errors, making the flange force symmetrical, avoiding cantilever effect, thereby improving rigidity and accuracy, reducing initial positioning deviation, and improving subsequent clamping accuracy. There is no need to repeatedly adjust the position of the ball nut to ensure coaxiality, thereby improving overall processing efficiency and reducing jaw wear due to uneven clamping force when the chuck clamps the ball nut due to position deviation of the ball nut itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1Schematic diagram of the ball nut during the clamping process when it is offset (inset a is a schematic diagram of the ideal distance L1 between the grinding wheel and the front end of the ball nut, and inset b is a schematic diagram of the distance L3 after offset, and L1>L3);

[0027] Figure 2 This is a schematic diagram of the ball nut when the front end is offset from the grinding wheel by a distance of L6 during the ball nut clamping process;

[0028] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 4 A schematic diagram of the positional relationship between the chuck and the adjustment assembly of the present invention;

[0030] Figure 5 Schematic diagram of the positional relationship between the positioning rod and the sliding rod of the present invention;

[0031] Figure 6 Schematic diagram of the positional relationship between the adjustment plate, the support plate and the hydraulic rod of the present invention;

[0032] Figure 7 A schematic diagram of the present invention showing an adjustment plate adjusting a ball nut having a circular flange portion;

[0033] Figure 8 Schematic diagram of the positional relationship between the center point of the ball nut and the center point of the chuck after the ball nut is clamped by the clamping plate of the present invention;

[0034] Figure 9 This is a schematic diagram of the present invention when the center point of the ball nut and the center point of the chuck are aligned;

[0035] Figure 10 Schematic diagram of the positional relationship between the cross bar and the first rack bar of the present invention;

[0036] Figure 11 Schematic diagram of the positional relationship between the flat plate, the crossbar and the second rack bar of the present invention;

[0037] Figure 12 Schematic diagram of the positional relationship between the crossbar, the flat plate and the torsion spring of the present invention;

[0038] Figure 13 Schematic diagram of the positional relationship between the flat panel and the support rods when the flat panel is horizontal;

[0039] Figure 14 This is a schematic diagram of the flat plate rotating downward after the crossbar is pushed;

[0040] Figure 15 This is a schematic diagram of the baffle of the present invention after rotating 90 degrees;

[0041] Figure 16Schematic diagram of the positional relationship between the grinding connecting rod, the main shaft and the motor of the present invention;

[0042] Figure 17 for Figure 16 A partial enlarged view of point A in the middle;

[0043] Figure 18 This is a schematic diagram of the connection relationship between the grinding connecting rod, the grinding wheel and the hose of the present invention;

[0044] Figure 19 This is a schematic diagram of the invention in which the tilted grinding wheel grinds the internal thread of a ball nut when the grinding connecting rod is in a horizontal position.

[0045] In the attached figure:

[0046] 1. Machine body; 2. Chuck; 3. Grinding assembly; 4. Support plate; 5. Clamp; 6. Adjustment plate; 7. Push plate; 701. Hydraulic rod; 8. Positioning rod; 9. Sliding rod; 10. Support rod; 11. Telescopic member 1; 12. First spring; 13. First rack rod; 14. First gear; 15. Cross bar; 16. Flat plate; 17. Torsion spring; 18. Telescopic member 2; 19. Second rack rod; 20. Second gear; 21. Baffle; 22. Bottom plate; 23. Fixed seat; 24. Motor; 25. Housing; 26. Spindle; 27. Grinding connecting rod; 28. Hose; 29. Wire flexible shaft; 30. Screw; 31. Gasket; 32. Grinding wheel; 33. Nut; 34. Second spring; 35. Third spring; 36. Fourth spring; 37. Fifth spring; 38. Guide rail 1; 39. Guide rail 2. DETAILED DESCRIPTION

[0047] See also Figures 1-19The present invention provides a technical solution: a ball nut internal thread bent rod grinding system device, including a body 1, a chuck 2 rotatably set on the body 1 and a grinding assembly 3, and also includes an adjusting assembly, the adjusting assembly includes a support plate 4, two clamping plates 5, an adjusting plate 6, a push plate 7, a hydraulic rod 701, an elastic joint 702 and a driving assembly (the elastic joint 702 can be an elastic telescopic rod, which is common knowledge of those skilled in the art. Its installation and setting are common knowledge of the prior art and are not described in detail here). The support plate 4 is set on the chuck 2, and the two clamping plates 5 are symmetrically arranged on the support plate 4 and are both slidably connected to the support plate 4. A second spring 34 is fixedly connected between the clamping plates 5 and the support plate 4. The two clamping plates 5 are used to be placed by the two clamping plates 5 when the ball nut is placed. The side is clamped, the adjusting plate 6 is located behind the clamping plate 5 and is slidably connected to the support plate 4, and a third spring 35 is fixedly connected between the adjusting plate 6 and the support plate 4. The push plate 7 is slidably connected to the support plate 4 and is located above the adjusting plate 6. A fourth spring 36 is fixedly connected between the push plate 7 and the support plate 4. When the ball nut is placed on the adjusting plate 6, the angle of the flange part of the ball nut is adjusted by contact with the adjusting plate 6, and then the ball nut is pushed to contact the rear side wall of the clamping plate 5 by the push plate 7. The hydraulic rod 701 is fixedly connected to the support plate 4, and the hydraulic rod 701 is located behind the push plate 7. The drive assembly is used to control the different heights of the support plate 4 on the chuck 2 according to the relative movement distance of the two clamping plates 5, so that the center point of the ball nuts of different sizes is coaxial with the center point of the chuck 2;

[0048] The grinding assembly 3 includes a base plate 22, which is slidably connected to the body 1. A fixed seat 23 is slidably connected to the base plate 22, and a motor 24 is fixedly connected to the fixed seat 23. The motor 24 is fixedly connected to a housing 25. The housing 25 is threadedly connected to a main shaft 26 by bolts. The main shaft 26 is fixedly connected to a grinding connecting rod 27. A hose 28 is provided inside the grinding connecting rod 27. A steel wire flexible shaft 29 is provided inside the hose 28. One end of the steel wire flexible shaft 29 slides inside the output end of the motor 24 and is abutted by a bolt. The other end of the steel wire flexible shaft 29 is fixedly connected to a screw 30. A gasket 31 is threadedly connected to the screw 30. A grinding wheel 32 is provided on the gasket 31. The grinding wheel 32 is arranged at an angle, and a nut 33 is threaded on the gasket 31.

[0049] The driving assembly includes a positioning rod 8 fixedly connected to the chuck 2 and a sliding rod 9. The sliding rod 9 is slidably connected to the support plate 4. A support rod 10 is rotatably connected to the sliding rod 9. The bottom end of the support rod 10 is rotatably connected to the clamping plate 5. When the clamping plate 5 slides, the support rod 10 pushes the sliding rod 9 to move so that the horizontal part of the sliding rod 9 is at the same height as the center point of the ball nut.

[0050] It also includes a linear drive group, which is used to drive the support plate 4 to move until the slide rod 9 contacts the positioning rod 8 and stops.

[0051] like Figure 3-Figure 7 As shown:

[0052] Pre-assembly and adjustment of ball nuts:

[0053] The ball nut is placed between the two clamping plates 5. The bending design of the clamping plates 5 and the top of the push plate 7 facilitates the placement of nuts of different specifications and the movement of the clamping plates 5 and the push plate 7. At the moment of placement, the second spring 34 drives the clamping plates 5 to pre-tighten both sides of the nut to complete the initial connection, eliminating the tedious operation of manual lifting for a long time. The adjusting plate 6 cooperates with the third spring 35 to accurately adjust the posture of the nut flange. Figure 6 Taking the flat-cut flange shown as an example, when the nut flange contacts the adjustment plate 6, the elastic potential energy of the third spring 35 causes the two to continue to fit together, effectively limiting the nut's rotational freedom and enabling the ball nut's flange to be in contact with the two clamping plates 5. This design is not only applicable to various flange shapes such as rectangular, D-shaped, and circular, but is also compatible with ball nuts and flanges of different sizes. Subsequently, under the action of the fourth spring 36, the push plate 7 pushes the nut flange, causing it to be firmly clamped between the push plate 7 and the clamping plate 5, thereby achieving initial fixation of the nut. The hydraulic rod 701 then extends from the rear, and when the elastic joint 702 contacts the push plate 7, the push plate 7 is forced to resist the flange of the ball nut.

[0054] By limiting the freedom of the ball nut by the adjusting plate 6, it is prevented from tilting freely, so that the flange portion can be evenly distributed behind the two clamping plates 5. In particular, for the flat-cut, D-shaped and rectangular flanges, it can ensure that the flange portion protruding outside the flat-cut flange will not be in an up-and-down state, and thus when the strong resistance force exerted by the hydraulic rod 701 and the elastic joint 702 is used to position the flange, it avoids reliance on a single-sided reference, thereby reducing errors, making the flange portion symmetrically stressed, avoiding the cantilever effect, and thus improving rigidity and accuracy. For the rectangular flange, one of its edges can be in contact with the adjusting plate 6 to avoid irregular distribution at its four corners. For the D-shaped flange, its horizontal portion is prevented from being vertical.

[0055] By adjusting the ball nut by the adjusting plate 6, no matter how the nut specifications change, it can ensure that the front and rear ends of the flange are in close contact with the clamping plate 5 and the push plate 7, ensuring that the axial and radial positions of the flanges of the nuts in the same batch are highly consistent, thereby making the distance between the front end of the nut and the grinding wheel 32 constant, ensuring a uniform grinding feed path, eliminating the problem of random clamping errors and deterioration of machining accuracy from the root, and avoiding defects such as different effective lengths of threads, deviations in tooth profile accuracy, and excessive cylindricity of inner holes.

[0056] Determine the coaxiality of the ball nut and the chuck 2 and clamping work:

[0057] like Figure 8-9 As shown, Figure 8This is a schematic diagram of the positional relationship between the center point A of the ball nut and the center point B of the chuck 2 after the pre-engagement and adjustment work is completed. After the pre-engagement and adjustment are completed, the center point A of the ball nut and the center point B of the chuck 2 are in a non-coaxial state. At this time, the bottom of the positioning rod 8 and point B are on the same horizontal line P2, and the horizontal part of the slide rod 9 and point A are on the same horizontal line P1. There is a height difference between P1 and P2. The linear drive group is started to push the support plate 4 upward until the slide rod 9 contacts the positioning rod 8. At this time, P1 and P2 coincide, and the axes of points A and B converge at point C, realizing precise coaxiality between the nut and the chuck. Subsequently, the claws on the chuck 2 automatically control the radial expansion and contraction according to the pressure changes when clamping nuts of different specifications with the help of built-in sensors, thereby completing stable clamping of the nut.

[0058] It is worth mentioning that as the nut diameter increases, its center point moves upward relative to the support plate 4, the distance between the clamping plates 5 increases, and the support rod 10 pushes the slide bar 9 to rise synchronously, ensuring that the slide bar 9 is always at the same height as the nut center point. Therefore, when the slide bar 9 contacts the positioning rod 8, the nut and the chuck are precisely coaxial. By pre-calibrating the coaxiality before clamping, the initial positioning deviation is greatly reduced, the clamping accuracy is significantly improved, the repeated adjustment process is reduced, and the processing efficiency is improved. At the same time, it avoids uneven clamping force when the chuck is forced to position due to nut position deviation, effectively reduces jaw wear, and extends the service life of the equipment.

[0059] By pre-determining the coaxiality of the ball nut and the chuck 2 and then fixing the ball nut, the initial positioning deviation is reduced and the subsequent clamping accuracy is improved. There is no need to repeatedly adjust the position of the ball nut to ensure the coaxiality, which improves the overall processing efficiency and reduces the wear of the jaws caused by uneven clamping force when the chuck 2 is forced to position the ball nut due to the position deviation of the ball nut itself when the chuck 2 is clamped on the ball nut;

[0060] When positioning flanges of different shapes, it can avoid reliance on edge references, thereby reducing errors, making the flange forces symmetrical, avoiding cantilever effects, and improving rigidity and accuracy.

[0061] Grinding work:

[0062] like Figure 16-19 As shown, the bottom plate 22 realizes the front and rear position with the body 1 through the guide rail 1 38 provided on the body 1, and the fixing seat 23 slides up and down with the bottom plate 22 through the guide rail 2 39 provided on the bottom plate 22. The installation of the guide rail 1 38 and the guide rail 2 39 are conventional settings and will not be described in detail here.

[0063] The motor 24 and the grinding wheel 32 are adjusted forward and backward and upward and downward by the guide rail 1 38 and the guide rail 2 39, thereby ensuring contact with the inner wall when grinding the internal threads of ball nuts of different sizes. During grinding, the motor 24 drives the steel wire flexible shaft 29 to rotate inside the hose 28, and the screw 30 drives the gasket 31, the nut 33 and the grinding wheel 32 to rotate, thereby performing the grinding work;

[0064] In the traditional internal thread grinding process, although a straight rod type grinding rod is used, the grinding rod and the grinding wheel 32 need to be tilted relative to the ball nut (such as Figure 1-Figure 2 As shown), under the condition of the same thread diameter, the larger the lead, the larger the helix angle. When the grinding wheel 32 is fed according to a fixed trajectory, the traditional straight-rod grinding rod processing system will interfere with the ball nut, and the grinding rod will collide with the inner wall of the nut. The internal threads of large-lead and super-lead nuts have therefore become a pain point in the ball screw industry. An innovative design is adopted to make the grinding wheel 32 tilted and the grinding connecting rod 27 horizontal, and the helix angle of the grinding wheel 32 is transferred from the grinding rod to the grinding wheel 32, bypassing the disadvantage of the straight-rod grinding system that the helix angle must be swung throughout the straight-rod grinding rod system. A motor 24 with a speed of 32,000-42,000 rpm is used as the power output source, and the power is connected to the grinding wheel 32 through a steel wire flexible shaft 29. Therefore, the processing pain points of large-lead and super-lead nuts are solved.

[0065] The present invention adjusts the ball nut through the adjustment plate 6 to ensure that the front and rear ends of the flange are in close contact with the clamping plate 5 and the push plate 7 no matter how the specifications of the nut change, so as to ensure that the axial and radial positions of the flanges of the nuts of the same batch are highly consistent, thereby making the distance between the front end of the nut and the grinding wheel 32 constant, ensuring a uniform grinding feed path, eliminating the need to adjust the grinding feed path multiple times, eliminating the problem of random errors in clamping and degradation of machining accuracy from the root, and avoiding defects such as different effective lengths of threads, deviations in tooth profile accuracy and excessive cylindricity of inner holes.

[0066] Grinding component assembly process:

[0067] Step 1: Install the hose 28, the steel wire flexible shaft 29, the grinding wheel 32, the gasket 31 and the nut 33 into the grinding connecting rod 27 in sequence, and fix the grinding wheel 32 by threading the gasket 31 and the nut 33;

[0068] Step 2: Insert the other end of the steel wire flexible shaft 29 into the mounting slot inside the motor 23, and then lock the steel wire flexible shaft with a bolt;

[0069] Step 3: Use a dial indicator to level the grinding connecting rod 27, with a parallelism within 0.05 mm;

[0070] Step 4: Use an inclinometer to adjust the spindle 26 angle to 0 degrees so that the downward tilt angle of the grinding wheel 32 is the same as the helix angle of the pre-ground ball nut;

[0071] Step 5: When grinding the internal thread of the ball nut, make sure that the maximum spindle speed does not exceed 90% of the limit speed.

[0072] The linear drive assembly includes a telescopic part 11 fixedly connected to the chuck 2. The telescopic part 11 is a cylinder or electric push rod that can be wirelessly controlled in the prior art. It is common knowledge among those skilled in the art and will not be described in detail here. The telescopic end of the telescopic part 11 is slidingly connected to the support plate 4, and a first spring 12 is fixedly connected between the telescopic end of the telescopic part 11 and the support plate 4.

[0073] like Figure 8-Figure 9 As shown:

[0074] When the telescopic member 11 is extended, the support plate 4 is pulled up through the first spring 12. When the slide rod 9 contacts the positioning rod 8, the slide rod 9 is blocked and the ball nut shaft is squeezed through the support rod 10. At this time, the slide rod 9 stops here, and then the telescopic member 11 continues to extend to stretch the first spring 12. At this time, the coaxiality of the center point of the ball nuts of different specifications and the center point of the chuck 2 can be adjusted.

[0075] The two clamping plates 5 are both fixedly connected to a first rack rod 13 , and a first gear 14 is meshed between the two first rack rods 13 . The first gear 14 is rotatably connected to the support plate 4 .

[0076] like Figure 10 As shown:

[0077] When the clamping plate 5 on one side slides, the transmission of the first rack rod 13 and the first gear 14 drives the clamping plate 5 on the other side to move synchronously in the opposite direction, thereby achieving equidistant centering and improving the accuracy of synchronous centering of the ball nut.

[0078] A cross bar 15 is slidably connected to the support plate 4, and the cross bar 15 is rotatably connected to the flat plate 16. A torsion spring 17 is sleeved on the rotating shaft of the flat plate 16. A telescopic part 2 18 is fixedly connected between the cross bar 15 and the support plate 4. The telescopic part 11 is a cylinder or electric push rod that can be wirelessly controlled in the prior art. It is common knowledge for those skilled in the art and will not be described in detail here.

[0079] like Figure 10-14 As shown:

[0080] When the ball nut is placed, the flat plate 16 is in a horizontal position, which makes it easier for the ball nut to be received. When the push plate 7 presses the flange of the ball nut tightly, the telescopic member 18 extends and pushes the cross bar 15 to slide inside the support plate 4. When the rear end of the flat plate 16 moves out of the support plate 4 (by Figure 13 Move to Figure 14(Afterwards) the torsion spring 17 drives the plate 16 to rotate downward, thereby making way for the subsequent clamping work of the chuck 2 on the ball nut. The rotation range of the plate 16 can be adjusted as needed, and the maximum angle can be 90 degrees. It only needs to be able to make way when clamping the shaft of the ball nut.

[0081] When the grinding is completed, the telescopic member 18 shortens and drives the cross bar 15 to move inward. At this time, the flat plate 16 is pushed back by the side wall of the support plate 4. When the cross bar 15 is fully restored, the upper and lower ends of the flat plate 16 are inside the support plate 4 so that it can remain horizontal.

[0082] Two second rack rods 19 are slidably connected to the cross bar 15, and a fifth spring 37 is fixedly connected between the two second rack rods 19 and the cross bar 15. The two second rack rods 19 are symmetrically arranged about the cross bar 15, and the two second rack rods 19 are both engaged with a second gear 20. The second gears 20 are respectively rotatably connected to the two splints 5, and the second gears 20 are fixedly connected to the baffle 21.

[0083] like Figure 10-12 as well as Figure 15 As shown:

[0084] The two baffles 21 can increase the contact surface when the ball nut is placed, thereby improving the accuracy. When the clamping plate 5 moves, the baffles 21 will move synchronously;

[0085] When the two clamps 5 are relatively far apart, the second rack rod 19 is stretched by the fifth spring 37 so that the second rack rod 19 can maintain engagement with the second gear 20. When the cross bar 15 is pushed outward, the cross bar 15 drives the second rack rod 19 to move synchronously, thereby engaging the second rack rod 19 with the second gear 20, and then rotating the baffle 21 to ninety degrees, thereby making way when the chuck 2 clamps the ball nut.

Claims

1. A ball nut internal thread bent rod grinding system device, comprising a body (1), a chuck (2) rotatably arranged on the body (1) and a grinding assembly (3), characterized in that: Also included is an adjustment assembly, the adjustment assembly comprising: A support plate (4) is disposed on the chuck (2); Two clamping plates (5) are symmetrically arranged on the support plate (4) and are elastically slidably connected to the support plate (4). The two clamping plates (5) are used to clamp the ball nut from both sides when it is placed. An adjusting plate (6) is located behind the clamping plate (5) and is elastically slidably connected to the supporting plate (4); A push plate (7) is elastically slidably connected to the support plate (4) and is located above the adjustment plate (6). When the ball nut is placed on the adjustment plate (6), the angle of the flange of the ball nut is adjusted by contact with the adjustment plate (6), and then the ball nut is pushed by the push plate (7) to contact the rear side wall of the clamping plate (5); The driving assembly is used to control the different heights of the support plate (4) on the chuck (2) according to the relative movement distance of the two clamping plates (5), so that the center points of ball nuts of different sizes are coaxial with the center point of the chuck (2).

2. A ball nut internal thread bent rod grinding system according to claim 1, characterized in that: The driving assembly comprises a positioning rod (8) fixedly connected to the chuck (2) and a sliding rod (9), the sliding rod (9) being slidably connected to the support plate (4), a support rod (10) being rotatably connected to the sliding rod (9), the bottom end of the support rod (10) being rotatably connected to the clamping plate (5), and when the clamping plate (5) slides, the support rod (10) pushes the sliding rod (9) to move so that the horizontal portion of the sliding rod (9) and the center point of the ball nut are at the same height; It also includes a linear drive group, which is used to drive the support plate (4) to move until the slide rod (9) contacts the positioning rod (8) and stops.

3. The ball nut internal thread bent rod grinding system according to claim 2, characterized in that: The linear drive assembly comprises a telescopic member (11) fixedly connected to the chuck (2), a telescopic end of the telescopic member (11) being slidably connected to the support plate (4), and a first spring (12) being fixedly connected between the telescopic end of the telescopic member (11) and the support plate (4).

4. A ball nut internal thread bent rod grinding system according to claim 3, characterized in that: The two clamping plates (5) are both fixedly connected to a first rack rod (13), a first gear (14) is meshed between the two first rack rods (13), and the first gear (14) is rotatably connected to the support plate (4).

5. The ball nut internal thread bent rod grinding system according to claim 4, characterized in that: A crossbar (15) is slidably connected to the support plate (4), and the crossbar (15) is rotatably connected to a flat plate (16). A torsion spring (17) is sleeved on the rotation axis of the flat plate (16), and a telescopic member 2 (18) is fixedly connected between the crossbar (15) and the support plate (4).

6. The ball nut internal thread bent rod grinding system according to claim 5, characterized in that: Two second rack rods (19) are elastically and slidably connected to the cross bar (15), and the two second rack rods (19) are symmetrically arranged with respect to the cross bar (15). The two second rack rods (19) are both engaged with a second gear (20), and the second gears (20) are respectively rotatably connected to the two clamping plates (5), and the second gears (20) are both fixedly connected to a baffle (21).

7. The ball nut internal thread bent rod grinding system according to claim 1, characterized in that: The grinding assembly (3) comprises a base plate (22), the base plate (22) is slidably connected to the machine body (1), a fixed seat (23) is slidably connected to the base plate (22), a motor (24) is fixedly connected to the fixed seat (23), the motor (24) is fixedly connected to a housing (25), the housing (25) is threadedly connected to a main shaft (26) via bolts, the main shaft (26) is fixedly connected to a grinding connecting rod (27), and a grinding connecting rod (27) is provided inside. A hose (28) is provided with a steel wire flexible shaft (29) inside the hose (28), one end of the steel wire flexible shaft (29) slides inside the output end of the motor (24) and is abutted by a bolt, and the other end of the steel wire flexible shaft (29) is fixedly connected with a screw rod (30), a gasket (31) is threadedly connected to the screw rod (30), a grinding wheel (32) is provided on the gasket (31), the grinding wheel (32) is tilted, and a nut (33) is threadedly connected to the gasket (31).

8. The assembly process of a ball nut internal thread bent rod grinding system according to claim 7, characterized in that: The process includes the following steps: Step 1: Install the hose (28), the steel wire flexible shaft (29), the grinding wheel (32), the gasket (31) and the nut (33) in the grinding connecting rod (27) in sequence, and fix the grinding wheel (32) by threading the gasket (31) and the nut (33); Step 2: Insert the other end of the steel wire flexible shaft (29) into the mounting slot inside the motor (23), and then lock the steel wire flexible shaft with a bolt; Step 3: Use a dial indicator to level the grinding connecting rod (27) to a parallelism within 0.05 mm; Step 4: Use an inclinometer to adjust the spindle (26) angle to 0 degrees so that the downward tilt angle of the grinding wheel (32) is the same as the helix angle of the pre-ground ball nut; Step 5: When grinding the internal thread of the ball nut, the maximum rotation speed of the motor (23) does not exceed 90% of the limit rotation speed.

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