Grinding force dynamic measurement device and method during ball nut internal thread forming grinding

Abstract

The present invention discloses a device for dynamically measuring the grinding force during the forming and grinding of the internal thread of a ball nut. The cable winder and the automatic unwinding and locking action of the unwinder solve the problem of the winding interference and pulling action of the cable on the dynamometer caused by rotation when measuring the dynamic grinding force. The tool holder can fix ball nut toolings of different models, and then measure ball nuts of different sizes and models. The adjustment bolt on the tool holder can quickly adjust the parallelism of the ball nut tooling, and then adjust the rotation center position of the nut tooling through a four-jaw chuck to reach the required coaxiality range, changing the traditional way of adjusting the coaxiality by knocking, increasing the speed of clamping the ball nut, and reducing physical damage to the ball nut tooling. A rollable ring is arranged on the circumference of the cable winder to reduce the friction resistance of manually pulling out more cables when unwinding, and prevent the excess length of cable from winding around the grinding force sensor when unwinding.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding force measurement, in particular to a device and method for dynamically measuring grinding force during forming and grinding of internal threads of a ball nut. Background Art

[0002] With the development of processing and manufacturing technology and equipment, the grinding of ball nuts has progressed from interference grinding to form grinding, especially for large-lead ball nuts with increasing demand. Domestic form grinding equipment has also made breakthroughs, and special machine tools for ball nut form grinding have been put into production in large quantities. However, there is a lack of further research on its processing technology, and the grinding force, the most important factor affecting the processing technology, cannot be dynamically measured during processing.

[0003] As the last step in ball nut processing, ball nut forming grinding is the most important step in the entire nut processing procedure. Its processing quality determines the final quality of the ball nut. The grinding force during processing is one of the most important factors affecting the processing quality. The grinding force is affected by a variety of processing parameters and can reflect the comprehensive effect of a variety of processing parameters. It is the key to how to accurately measure the grinding force during the processing. During the ball nut forming grinding process, the dynamic grinding force cannot be accurately measured at the grinding head end due to the distance, vibration, and the large rigidity structure of the grinding head. The nut end needs to perform spiral motion, and it is impossible to install a force sensor device for dynamic measurement. Summary of the invention

[0004] The purpose of the present invention is to address the problems existing in the above-mentioned prior art and to provide a device and method for dynamically measuring the grinding force during the forming grinding of the internal thread of a ball nut, so as to solve the problem of entanglement of the dynamometer cable caused by the spiral movement of the nut end, and the problem that the ball nut tooling and the ball nut cannot be quickly clamped.

[0005] The technical solution to achieve the purpose of the present invention is: a device for dynamically measuring the grinding force during the forming and grinding of the internal thread of a ball nut, the device comprising a cable winder, a cable unwinder, and a coaxially arranged rotatable four-jaw chuck, a chuck connector, a grinding force sensor, a tooling fixture and a ball nut tooling; the rotatable four-jaw chuck is fixed on the Z-axis housing of the grinder, the cable winder is an annular structure sleeved on the outside of the rotatable four-jaw chuck with a gap therebetween, and the cable winder is fixed on the Z-axis housing of the grinder through a plurality of identical brackets; one end of the chuck connector is clamped by the rotatable four-jaw chuck, and the other end is fixedly connected to the grinding force sensor, and the grinder The Z axis of the cutting force sensor is kept parallel to the central axis direction of the chuck connector; the tooling fixture is fixed on the grinding force sensor, and the ball nut tooling is fixed on the tooling fixture through an adjustable device, and ball nut tools of different sizes can be replaced by adjusting the adjustable device; one end of the grinding force sensor cable is connected to the grinding force sensor, and is clamped by a cable untie fixed on the chuck connector, and then wound on the cable winder, and the other end is connected to the charge amplifier; when measuring the grinding force, the cable untie rotates synchronously with the chuck connector to realize automatic cable untying; the circumferential surface of the cable winder is provided with a cable binding column for fixing the grinding force sensor cable.

[0006] Furthermore, the cable untie comprises a connecting component and a clamping component, and the clamping component is fixedly connected to the chuck connector via the connecting component and is used for clamping the grinding force sensor cable.

[0007] Furthermore, the clamping component includes an upper shell and a lower shell that are movably connected. When the cable untie clamps the grinding force sensor cable, the upper shell and the lower shell clamp the grinding force sensor cable by hinges and are locked by a first locking device.

[0008] Furthermore, a rubber sleeve is provided in the clamping component, including an upper rubber sleeve adhered to the upper outer shell, and a lower rubber sleeve adhered to the lower outer shell.

[0009] Furthermore, the adjustable device includes a fixing component and an adjusting component, and the two components jointly clamp the ball nut fixture to be tested, and the ball nut fixture is adjusted within the required parallelism range by the adjusting component.

[0010] Furthermore, the fixing component and the adjusting component both include an adjustable bolt and a U-shaped clamping block arranged at the end of the screw, and the U-shaped clamping block is in contact with the ball nut tooling, and the curvature of the contact surface is the same to maintain fit.

[0011] Furthermore, the ball nut tooling is provided with a second locking device for locking the ball nut.

[0012] Furthermore, a rollable ring is provided on the circumferential surface of the cable winder.

[0013] A method for dynamically measuring grinding force during forming grinding of an internal thread of a ball nut based on the above device comprises:

[0014] Step 1, clamping the chuck connector by a rotatable four-jaw chuck;

[0015] Step 2, fixing the grinding force sensor on the chuck connector;

[0016] Step 3, connecting the tooling fixture to the grinding force sensor;

[0017] Step 4, clamping the ball nut fixture to be measured by the fixing component and the adjusting component on the fixture fixture, and adjusting the ball nut fixture by the adjusting component so that the ball nut fixture is within the set parallelism range;

[0018] Step 5, adjust the rotatable four-jaw chuck to ensure that the nut fixture is within the set coaxiality range when rotating;

[0019] Step 6, put the cable winder on the four-jaw chuck and fix it on the Z-axis housing of the grinder through the bracket;

[0020] Step 7, fix the cable untie on the chuck connector;

[0021] Step 8, connect one end of the grinding force sensor cable to the grinding force sensor, lock the cable through the cable untie, and then wind the cable around the cable winder in the same rotation direction as the nut, and connect the other end to the charge amplifier;

[0022] Step 9, set the target processing parameters, start the grinding process and measure the grinding force, and untie the cable during this process.

[0023] Compared with the prior art, the present invention has the following significant advantages:

[0024] 1) The automatic unwinding and locking of the cable winder and unwinder solves the problem of cable winding interference and pulling on the dynamometer due to rotation when measuring dynamic grinding force.

[0025] 2) The tool holder can be used to fix different types of ball nut tools, so that ball nuts of different sizes and types can be measured.

[0026] 3) The adjusting bolt on the fixture can quickly adjust the parallelism of the ball nut fixture, and then the four-jaw chuck can be used to adjust the rotation center position of the nut fixture to the required coaxiality range, changing the traditional way of adjusting the coaxiality by tapping, increasing the speed of clamping the ball nut and reducing physical damage to the ball nut fixture.

[0027] 4) A rolling ring is arranged on the circumference of the cable winder to reduce the friction resistance of manually pulling out excess cable when unwinding the cable, and prevent the excess length of cable from winding around the grinding force sensor when unwinding the cable.

[0028] 5) The present invention is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a schematic diagram of the overall structure of the grinding force dynamic measurement device during the forming grinding of the internal thread of a ball nut according to the present invention.

[0030] Figure 2 for Figure 1 Enlarged structural diagram at A in the middle.

[0031] Figure 3 It is a cross-sectional view of the internal structure of the tooling fixture of the present invention.

[0032] In the figure: 1. bracket; 2. grinder Z-axis housing; 3. cable winder; 4. rolling ring; 5. cable tie column; 6. cable untie; 7. rubber bushing; 7a. upper rubber bushing; 7b. lower rubber bushing; 8. butterfly screw; 9. grinding force sensor; 10. tooling fixture; 11. locking screw; 12. ball nut tooling; 13. clamping screw; 14. adjustment screw; 15. chuck connector; 16. rotatable four-jaw chuck; 17. grinding force sensor cable; 18a. upper housing; 18b. lower housing; 19. U-shaped clamping block. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] In one embodiment, in combination Figure 1 A device for dynamically measuring grinding force during forming and grinding of internal threads of a ball nut is proposed, the device comprising a cable winder 3, a cable unwinder 6, and a coaxially arranged rotatable four-jaw chuck 16, a chuck connector 15, a grinding force sensor 9, a tool holder 10 and a ball nut tool 12; the rotatable four-jaw chuck 16 is fixed on the Z-axis housing 2 of the grinder, the cable winder 3 is an annular structure sleeved on the outside of the rotatable four-jaw chuck 16 with a gap therebetween, and the cable winder 3 is fixed on the Z-axis housing 2 of the grinder through three identical brackets 1; one end of the chuck connector 15 is clamped by the rotatable four-jaw chuck 16, and the other end is fixedly connected to the grinding force sensor 9, and the grinding force sensor 9 The Z axis is kept parallel to the central axis direction of the chuck connector 15; the tooling fixture 10 is fixed on the grinding force sensor 9, and the ball nut tooling 12 is fixed on the tooling fixture 10 by an adjustable device, and the ball nut tooling 12 of different sizes can be replaced by adjusting the adjustable device; one end of the grinding force sensor cable 17 is connected to the grinding force sensor 9, and is clamped by the untie device 6 fixed on the chuck connector 15, and then wound on the cable winder 3, and the other end is connected to the charge amplifier; when measuring the grinding force, the untie device 6 rotates synchronously with the chuck connector 15 to realize automatic untie; the circumferential surface of the cable winder 3 is provided with a column 5 for fixing the grinding force sensor cable 17.

[0037] Here, before measuring the grinding force, it is necessary to determine the number of windings according to the lead number of the internal thread of the ball nut, and then wind the grinding force sensor cable 17 onto the circumference of the cable winder 3 in the same direction.

[0038] Here, each fixing method can use screws.

[0039] Furthermore, in one of the embodiments, the cable untie 6 includes a connecting component and a clamping component, and the clamping component is fixedly connected to the chuck connector 15 through the connecting component, and is used to clamp the grinding force sensor cable 17 .

[0040] Further, in one embodiment, in combination Figure 2 The clamping component includes an upper shell 18a and a lower shell 18b that are movably connected. When the cable untie 6 clamps the grinding force sensor cable 17, the upper shell 18a and the lower shell 18b clamp the grinding force sensor cable 17 by means of hinges and are locked by the first locking device 8.

[0041] Furthermore, in one of the embodiments, a rubber sleeve 7 is provided in the clamping component, including an upper rubber bushing 7a adhered to the upper shell 18a, and a lower rubber bushing 7b adhered to the lower shell 18b.

[0042] Further preferably, in one embodiment, the first locking device 8 is a butterfly screw.

[0043] Furthermore, in one of the embodiments, the adjustable device includes a fixing component 13 and an adjusting component 14 , which together clamp the ball nut fixture 12 to be tested, and the ball nut fixture 12 is adjusted within the required parallelism range by the adjusting component 14 .

[0044] Further, in one embodiment, in combination Figure 3 The fixing component 13 and the adjusting component 14 both include an adjustable bolt and a U-shaped clamping block 19 arranged at the end of the screw. The U-shaped clamping block 19 contacts the ball nut fixture 12, and the curvature of the contact surface is the same to maintain fit.

[0045] Further, in one embodiment, in combination Figure 3 The ball nut fixture 12 is provided with a second locking device 11 for locking the ball nut.

[0046] Furthermore, in one of the embodiments, a rollable ring 4 is also provided on the circumferential surface of the cable winder 3 .

[0047] In one embodiment, a method for dynamically measuring grinding force during forming grinding of an internal thread of a ball nut is provided, the method comprising:

[0048] Step 1, clamping the chuck connector by a rotatable four-jaw chuck;

[0049] Step 2, fixing the grinding force sensor on the chuck connector;

[0050] Step 3, connecting the tooling fixture to the grinding force sensor;

[0051] Step 4, clamping the ball nut fixture to be measured by the fixing component and the adjusting component on the fixture fixture, and adjusting the ball nut fixture by the adjusting component so that the ball nut fixture is within the set parallelism range;

[0052] Step 5, adjust the rotatable four-jaw chuck to ensure that the nut fixture is within the set coaxiality range when rotating;

[0053] Step 6, put the cable winder on the four-jaw chuck and fix it on the Z-axis housing of the grinder through the bracket;

[0054] Step 7, fix the cable untie on the chuck connector;

[0055] Step 8, connect one end of the grinding force sensor cable to the grinding force sensor, lock the cable through the cable untie, and then wind the cable around the cable winder in the same rotation direction as the nut, and connect the other end to the charge amplifier;

[0056] Step 9, set the target processing parameters, start the grinding process and measure the grinding force, and untie the cable during this process.

[0057] In some instances, when using the tool holder 10, the ball nut tooling 12 of different sizes can be replaced by loosening its fixing bolts 13 and adjusting bolts 14, and the parallelism can be quickly adjusted. Then, the center height of the ball nut tooling 12 can be adjusted by adjusting the rotatable four-jaw chuck 16 to achieve the purpose of quickly adjusting the coaxiality of the ball nut tooling 12, thereby directly replacing ball nuts with the same outer diameter, different inner diameters, different threads, and different leads. When it is necessary to measure the dynamic grinding force of ball nuts with different outer diameters, ball nut tooling 12 of different models and sizes can be quickly replaced through the tool holder 10.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dynamic measuring device for grinding force during forming grinding of internal threads of ball nuts, characterized in that: The device comprises a cable winder (3), a cable unwinder (6), a coaxially arranged rotatable four-jaw chuck (16), a chuck connector (15), a grinding force sensor (9), a tool holder (10) and a ball nut tool (12); the rotatable four-jaw chuck (16) is fixed on the Z-axis housing (2) of the grinding machine, the cable winder (3) is an annular structure sleeved on the outside of the rotatable four-jaw chuck (16) with a gap between the two, and the cable winder (3) is fixed on the Z-axis housing (2) of the grinding machine through a plurality of identical brackets (1); one end of the chuck connector (15) is clamped by the rotatable four-jaw chuck (16), and the other end is fixedly connected to the grinding force sensor (9), and the Z-axis of the grinding force sensor (9) is connected to the chuck connector (15). The tool holder (10) is fixed on the grinding force sensor (9), and the ball nut tool (12) is fixed on the tool holder (10) by an adjustable device, and the ball nut tool (12) of different sizes can be replaced by adjusting the adjustable device; one end of the grinding force sensor cable (17) is connected to the grinding force sensor (9), and is clamped by a cable unwinder (6) fixed on the chuck connector (15), and then wound on the cable winder (3), and the other end is connected to the charge amplifier; when measuring the grinding force, the cable unwinder (6) rotates synchronously with the chuck connector (15) to achieve automatic unwinding; the circumferential surface of the cable winder (3) is provided with a cable tie column (5) for fixing the grinding force sensor cable (17); The adjustable device comprises a fixing component (13) and an adjusting component (14), the two components jointly clamping the ball nut fixture (12) to be tested, and adjusting the ball nut fixture (12) within a required parallelism range through the adjusting component (14); The fixing component (13) and the adjusting component (14) both comprise an adjustable bolt and a U-shaped clamping block (19) arranged at the end of the adjustable bolt, the U-shaped clamping block (19) being in contact with the ball nut fixture (12), and the curvature of the contact surfaces being the same to maintain fit; The ball nut tooling (12) is provided with a second locking device (11) for locking the ball nut.

2. The grinding force dynamic measuring device during the forming grinding of the internal thread of a ball nut according to claim 1, characterized in that: The circumferential surface of the cable winder (3) is also provided with a rollable ring (4).

3. The grinding force dynamic measuring device during the forming and grinding of the internal thread of a ball nut according to claim 1, characterized in that: The cable untie (6) comprises a connecting component and a clamping component, wherein the clamping component is fixedly connected to a chuck connector (15) via the connecting component and is used for clamping a grinding force sensor cable (17).

4. The grinding force dynamic measuring device during the forming and grinding of the internal thread of a ball nut according to claim 3, characterized in that: The clamping component comprises an upper shell (18a) and a lower shell (18b) that are movably connected. When the cable untie (6) clamps the grinding force sensor cable (17), the upper shell (18a) and the lower shell (18b) clamp the grinding force sensor cable (17) by means of hinges and are locked by means of a first locking device (8).

5. The grinding force dynamic measuring device during the forming and grinding of the internal thread of a ball nut according to claim 3, characterized in that: The clamping component is provided with a rubber sleeve (7), comprising an upper rubber bushing (7a) adhered to the upper outer shell (18a), and a lower rubber bushing (7b) adhered to the lower outer shell (18b).

6. The grinding force dynamic measuring device during the internal thread forming grinding of a ball nut according to claim 1, characterized in that: The circumferential surface of the cable winder (3) is also provided with a rollable ring (4).

7. A method for dynamically measuring the grinding force during forming and grinding of a ball nut internal thread based on the device for dynamically measuring the grinding force during forming and grinding of a ball nut internal thread according to any one of claims 1 to 6, characterized in that: The method comprises: Step 1, clamping the chuck connector by a rotatable four-jaw chuck; Step 2, fixing the grinding force sensor on the chuck connector; Step 3, connecting the tooling fixture to the grinding force sensor; Step 4, clamping the ball nut fixture to be measured by the fixing component and the adjusting component on the fixture fixture, and adjusting the ball nut fixture by the adjusting component so that the ball nut fixture is within the set parallelism range; Step 5, adjust the rotatable four-jaw chuck to ensure that the nut fixture is within the set coaxiality range when rotating; Step 6, put the cable winder on the four-jaw chuck and fix it on the Z-axis housing of the grinder through the bracket; Step 7, fix the cable untie on the chuck connector; Step 8, connect one end of the grinding force sensor cable to the grinding force sensor, lock the cable through the cable untie, and then wind the cable around the cable winder in the same rotation direction as the nut, and connect the other end to the charge amplifier; Step 9, set the target processing parameters, start the grinding process and measure the grinding force, and untie the cable during this process.

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