Lead screw groove grinding method and equipment

Abstract

The invention discloses a lead screw groove grinding method and equipment, belongs to a precision machine manufacturing technology, and aims to solve the problem that the machining precision of a lead screw is relatively low in the existing process and equipment, a tensioned annular ring rope is driven to rotate around a wheel set, and one section of the annular ring rope serves as a working section; the working section makes contact with the lead screw groove and moves relative to the lead screw groove in the extending direction of the working section to grind the surface of the lead screw groove. And the lead screw is driven to rotate around the main axis, the annular ring rope and the lead screw do relative axial movement in the direction of the main axis, and the working section of the annular ring rope does spiral movement relative to the lead screw in the spiral extending direction of the lead screw groove so as to continuously grind the lead screw groove in the spiral extending direction of the lead screw groove. The annular ring rope has flexibility, can be matched with the lead screw groove, keeps tension to be in contact with the lead screw groove, can conduct precise grinding on the surface of the lead screw groove, and improves the surface quality of the lead screw groove.

Description

Technical Field

[0001] The invention belongs to the field of precision machinery manufacturing technology, and in particular relates to a method and equipment for grinding a lead screw groove. Background Art

[0002] With the rise and development of emerging industries such as precision manufacturing, industrial machine tools, industrial automation and digital control, humanoid robots, and autonomous driving technology, the requirements for high speed, high load, low torque, low noise, and long life of various types of lead screws are becoming increasingly higher, and the requirements for part processing accuracy and surface morphology quality are constantly increasing.

[0003] The existing screw processing technology and equipment only have the forming grinding process, but no grinding process. The processing accuracy of the screw is low and it is gradually difficult to meet the new requirements. Summary of the invention

[0004] The technical task proposed by the present invention is to overcome the defect of low processing accuracy of the screw by the existing processing technology and equipment, and to provide a screw groove grinding method and equipment, aiming to improve the processing accuracy of the screw.

[0005] To achieve the above object, the screw groove grinding method of the present invention is:

[0006] The tensioned annular rope is driven to rotate around the wheel set, and one section of the annular rope is used as a working section. The working section contacts the screw groove and moves relative to the screw groove along its own extension direction to grind the surface of the screw groove;

[0007] The lead screw is driven to rotate around the main axis, and the annular rope and the lead screw are made to move axially relative to each other along the direction of the main axis, so that the working section of the annular rope moves spirally relative to the lead screw along the spiral extension direction of the lead screw groove to continuously grind the lead screw groove along the spiral extension direction of the lead screw groove.

[0008] Accordingly, the working section of the annular rope is moved relative to the screw groove, the screw rotates around the main axis, and the working section moves relative to the screw along the spiral extension direction of the screw groove, so that the working section of the annular rope continuously grinds the screw groove along the spiral extension direction of the screw groove. The annular rope is flexible like the belt in the belt transmission mechanism, can fit with the screw groove, and maintain tension contact with the screw groove, can perform precision grinding on the surface of the screw groove, and improve the surface accuracy of the screw groove.

[0009] Preferably, when the working section is grinding the screw groove, the abrasive is directly or indirectly injected into the grinding position, so that the outer surface of the annular rope is clamped with the abrasive to grind the screw groove, thereby improving the grinding quality.

[0010] Preferably, the lead screw and / or the annular rope move along the direction of the main axis so that the lead screw and the annular rope move axially relative to each other, so as to continuously grind the lead screw groove along the spiral extension direction of the lead screw groove.

[0011] Preferably, the extension direction of the working section is along the spiral extension direction of the screw groove at the part contacting the screw groove, so as to ensure the fit between the working section of the annular rope and the screw groove and to protect the original macroscopic contour accuracy of the screw groove to the maximum extent.

[0012] Preferably, the same wheel set is configured with a plurality of annular ropes at the same time, so that the working sections of each annular rope contact different screw grooves of a screw respectively to grind all the screw grooves at the same time. Accordingly, the grooves of multiple screws can be ground at the same time, or the single screw can be repeatedly ground to improve the grinding efficiency.

[0013] Preferably, at least two annular loops of the wheel set are arranged, and the annular loops of the at least two wheel sets are distributed at different positions of the spiral extension direction of the same screw groove to grind the same screw groove at the same time. Accordingly, the efficient grinding of the same screw groove can be completed quickly.

[0014] Preferably, when there are two or more screw grooves, each screw groove can be ground one by one. Moreover, during grinding, one annular rope can be used to grind each screw groove one by one, or two or more annular ropes can be used to grind each screw groove one by one.

[0015] Preferably, the working section of the same annular loop rope is made to contact the screw grooves of at least two screws at the same time to grind the screw grooves of the two screws at the same time, thereby increasing the grinding efficiency.

[0016] The screw groove grinding device of the present invention comprises:

[0017] A clamping drive system for clamping the lead screw and driving the lead screw to rotate around the main axis;

[0018] The grinding system comprises a wheel set and an annular rope, wherein the annular rope is wound around the wheel set, is tensioned by the wheel set and is driven to rotate by the wheel set, and the section of the annular rope between two adjacent wheels in the wheel set is used as a working section;

[0019] The clamping drive system and / or the grinding system are movably configured to adjust the relative posture between the working section and the lead screw and the grinding feed and grinding disengagement between the working section and the lead screw groove.

[0020] Accordingly, the lead screw is installed in the clamping drive system, which clamps the lead screw and drives the lead screw to rotate around the main axis. The relative posture of the working section and the lead screw is adjusted through the activities of the clamping drive system and / or the grinding system, and the working section of the annular rope is brought into contact with the lead screw groove to achieve grinding feed, and after the grinding is completed, the working section of the annular rope is evacuated from the lead screw groove to achieve grinding disengagement. The precision grinding of the lead screw groove is completed.

[0021] Preferably, the clamping drive system includes a first clamp, a first seat, a power spindle, a second clamp, and a second seat. The first clamp is installed on the power spindle, and the power spindle is directly or indirectly constructed on the bed through the first seat; the second clamp is directly or indirectly constructed on the bed through the second seat. Accordingly, one end of the lead screw is clamped by the first clamp, and the other end of the lead screw is limited by the second clamp. The power spindle can drive the lead screw to rotate around the main axis through the first clamp. When the lead screw is not installed on the clamp, the main axis is reflected as the axis of the power spindle, and the axis of the power spindle is more specifically reflected as the line connecting the geometric center of the first clamp and the geometric center of the second clamp or the line connecting the rotation center of the first clamp and the rotation center of the second clamp.

[0022] Preferably, the first seat or / and the second seat can be adjusted in position along the direction of the main axis to adjust the distance between the first clamp and the second clamp, and are suitable for clamping screws of different lengths.

[0023] Preferably, the first seat and the second seat can be driven to move synchronously along the direction of the main axis, thereby moving the lead screw along the main axis to achieve axial feeding of the lead screw relative to the working section of the annular rope.

[0024] Preferably, the working section can rotate around the rotating shaft in a plane containing its center line and parallel to the main axis to adjust the relative posture of the working section and the lead screw and be locked. The purpose of adjusting the relative posture of the working section and the lead screw groove is to adjust the relative posture of the working section and the lead screw groove, especially to make the movement direction of the working section consistent with the lead angle direction of the lead screw groove. This is used to ensure the fit between the working section of the annular rope and the lead screw groove, so as to maximize the protection of the original macroscopic profile accuracy of the lead screw groove.

[0025] Preferably, the wheel set includes a driving wheel, a driven wheel and a tensioning wheel directly or indirectly mounted on a mounting plate, and the mounting plate is directly or indirectly mounted on a component via a rotating shaft. Accordingly, by installing an automatic tensioning wheel similar to an automobile engine belt, the rotation and tension of the entire annular rope are kept stable and maintained in a suitable working state.

[0026] Preferably, the component can move with the mounting plate in the radial direction of the lead screw under the action of the first driver to achieve grinding feeding and grinding disengagement between the working section and the lead screw groove.

[0027] Preferably, the working section can be driven to move along the direction of the main axis, thereby achieving axial feeding of the working section and the screw groove.

[0028] Preferably, the wheel set includes a driving wheel, a driven wheel and a tensioning wheel directly or indirectly arranged on a mounting plate, the mounting plate is directly or indirectly arranged on a component through a rotating shaft; the component is directly or indirectly arranged on a slide plate, the slide plate is directly or indirectly arranged on a bed, and the slide plate can be driven by a second driver to move along the direction of the main axis. Accordingly, the second driver drives the slide plate to move along the direction of the main axis, and the working section moves along the direction of the main axis, so as to realize the axial feeding of the working section and the screw groove.

[0029] Preferably, at least two annular coils are wound around the wheel set in parallel, and the spacing between adjacent annular coils along the main axis direction is the normal spacing between the adjacent grooves of the screw. When the screw is single-headed, that is, the screw has a spirally extending screw groove, at least two annular coils can be used to repeatedly grind the same spirally extending screw groove at the same time. When the screw has at least two heads, that is, the screw has spirally extending screw grooves corresponding to the number of heads, the spacing between at least two annular coils can be set to grind the same spirally extending screw groove at the same time, or can be set to grind all spirally extending screw grooves synchronously at the same time. This increases the grinding efficiency.

[0030] Preferably, two grinding systems are configured, and the working sections of the annular ropes of the two grinding systems are separated on opposite sides of the main axis. This increases the grinding efficiency. When the lead screw has a single head, that is, the lead screw has a spirally extending lead screw groove, the annular ropes of the two grinding systems can grind the same spirally extending lead screw groove at the same time. When the lead screw has at least two heads, that is, the lead screw has spirally extending lead screw grooves corresponding to the number of heads, the annular ropes of the two grinding systems can grind one of the spirally extending lead screw grooves at the same time, and then grind the other spirally extending lead screw groove at the same time; they can also grind all the spirally extending lead screw grooves at the same time, thereby increasing the grinding efficiency.

[0031] The present invention is configured with a clamping drive system and a grinding system. The grinding system includes a wheel set and an annular rope. The annular rope is wrapped around the wheel set, tensioned by the wheel set and driven to rotate by the wheel set. The section of the annular rope between two adjacent wheels in the wheel set is used as a working section. The clamping drive system or / and the grinding system are movably configured to adjust the relative posture between the working section and the screw and the grinding feed and grinding disengagement between the working section and the screw groove. Therefore, the tensioned annular rope is driven to rotate around the wheel set, so that the working section contacts the screw groove and moves relative to the screw groove along its own extension direction to grind the surface of the screw groove; at the same time, the screw is driven to rotate around the main axis, and the annular rope and the screw are relatively axially moved along the direction of the main axis, so that the working section of the annular rope moves relative to the screw along the spiral extension direction of the screw groove to continuously grind the screw groove along the spiral extension direction of the screw groove. Among them, the annular coil rope is flexible like the belt in the belt transmission mechanism, can fit with the screw groove, and maintain the coil rope tension in contact with the screw groove through the automatic tensioning wheel, which can perform precision grinding on the surface of the screw groove to improve the surface accuracy of the screw groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an isometric view of a screw groove grinding device according to Embodiment 1 of the present invention;

[0033] Figure 2 for Figure 1 The side orthographic projection schematic diagram of the screw groove grinding equipment shown;

[0034] Figure 3 for Figure 2 A magnified view of part A;

[0035] Figure 4 for Figure 1 Schematic diagram of the clamping drive system;

[0036] Figure 5 for Figure 1 A schematic diagram of a grinding system;

[0037] Figure 6 for Figure 1 Schematic diagram of a grinding system wheel set and annular loop rope;

[0038] Figure 7 It is a schematic diagram of another wheel set and annular loop rope of the present invention;

[0039] Figure 8 It is an isometric view of a screw groove grinding device according to Embodiment 2 of the present invention;

[0040] Fig. 9 It is an isometric view of a screw groove grinding device according to Embodiment 3 of the present invention;

[0041] Fig.10 A schematic diagram of simultaneously grinding the screw grooves of two screws in one working section of the present invention;

[0042] Description of the numbers in the figure:

[0043] 1 grinding system, 11 annular rope, 111 working section, 112 center line, 12 driving wheel, 13 driven wheel, 14 tensioning wheel, 15 grinding driver, 2 mounting plate, 3 lead screw, 31 main axis, 32 lead screw groove, 33 vertical plane, 4 clamping drive system, 41 first fixture, 42 power spindle, 43 first seat, 44 second fixture, 45 second seat, 5 component, 6 first driver, 7 slide plate, 8 bed, 9 second driver, 10 rotating shaft. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention are intended to cover non-exclusive inclusions. For example, a method or product comprising a series of technical features is not necessarily limited to those technical features clearly listed, but may also include other technical features that are not clearly listed and can be included in the method or product.

[0046] In the description of the present invention, it is necessary to understand that the technical features defined by the terms "first", "second" and the like with sequential concepts are only for the purpose of clearly describing the defined technical features so that the defined technical features can be clearly distinguished from other technical features, but do not represent such naming in actual implementation, and therefore cannot be understood as a limitation of the present invention.

[0047] In the present application, a screw groove refers to a continuous spiral groove extending from one end of the screw to the other end of the screw. Therefore, the number of screw heads is the number of screw grooves.

[0048] The present invention is described in detail below in conjunction with specific embodiments and accompanying drawings.

[0049] Example 1

[0050] Figure 1-3 A screw groove grinding device is shown, which includes a clamping drive system 4 and a grinding system 1.

[0051] The clamping drive system 4 is used to clamp the lead screw 3 and drive the lead screw to rotate around the main axis 31. Figure 4 As shown, the clamping drive system 4 includes a first fixture 41, a first seat 43, a power spindle 42, a second fixture 44 and a second seat 45. The first fixture 41 is mounted on the power spindle 42. The power spindle 42 is directly or indirectly arranged on the bed 8 through the first seat 43. The second fixture 44 is directly or indirectly arranged on the bed 8 through the second seat 45. Accordingly, when grinding the lead screw, one end of the lead screw 3 is clamped by the first fixture 41, and the other end of the lead screw 3 is limited by the second fixture 44, and the power spindle 42 drives the lead screw 3 to rotate around the main axis 31 through the first fixture 41. The main axis 31 is the axis of the lead screw 3. When the lead screw is not mounted on the fixture, the main axis 31 is reflected as the axis of the power spindle 42, and the axis of the power spindle is more specifically reflected as the line connecting the geometric center of the first fixture 41 and the geometric center of the second fixture 44 or the line connecting the rotation center of the first fixture and the rotation center of the second fixture.

[0052] In this embodiment, the first seat 43 and the second seat 45 can be adjusted in position along the direction of the main axis 31 to adjust the distance between the first clamp 41 and the second clamp 44, which is suitable for clamping screws of different lengths. In other embodiments, only the first seat or the second seat can be adjusted in position along the direction of the main axis.

[0053] In the present application, the direction along the main axis 31 refers to the direction consistent with the extension direction of the main axis, which can be the extension direction of the main axis or the direction parallel to the main axis.

[0054] In this embodiment, the first seat 43 and the second seat 45 can be driven to move synchronously along the direction of the main axis 31. Accordingly, the screw is moved along the main axis direction, and the working section of the annular rope is relatively realized to axially feed the screw groove 32 to the working section 111.

[0055] In other embodiments, the working section 111 may be driven to move in the direction of the main axis 31. Accordingly, the axial feeding of the working section 111 to the screw groove 32 is achieved by moving the working section 111 in the direction of the main axis 31. Specifically, the component 5 is directly or indirectly configured on the slide plate 7, and the slide plate 7 is directly or indirectly configured on the bed 8. The slide plate 7 can be driven by the second driver 9 to move in the direction of the main axis 31.

[0056] like Figure 5-6As shown, the grinding system 1 mainly includes a wheel set and an annular loop rope 11. The wheel set includes a driving wheel 12, a driven wheel 13 and a tensioning wheel 14 that directly or indirectly configure the mounting plate 2. The annular loop rope 1 is wrapped around the wheel set, tensioned by the wheel set and driven by the wheel set to rotate around the wheel set. The section of the annular loop rope 11 between the driving wheel 12 and the driven wheel 13 is used as a working section 111. Therefore, the working section 111 is a section of the annular loop rope 11 located at a specific position, not a section at a fixed position on the annular loop rope. As the annular loop rope rotates, the annular loop rope continuously and cyclically passes through the specific position as a working section. Among them, the driving wheel 12 is driven to rotate by the grinding driver 15, so that the annular loop rope 11 wrapped around the wheel set and tensioned by the tensioning wheel rotates.

[0057] In this embodiment, the clamping drive system 4 and / or the grinding system 1 are movably configured to adjust the relative posture of the working section 111 and the lead screw 3, and the grinding feed and grinding disengagement of the working section and the lead screw groove. In other embodiments, the clamping drive system may be movably configured or the clamping drive system and the grinding system may be movably configured to adjust the relative posture of the working section and the lead screw, and the grinding feed and grinding disengagement of the working section and the lead screw groove.

[0058] In this embodiment, in order to adjust the relative posture of the working section 111 and the lead screw 3, the working section 111 can be rotated around the rotating shaft 10 in a plane containing its center line 112 and parallel to the main axis 31 to adjust the relative posture of the working section and the lead screw and be locked. The purpose of adjusting the relative posture of the working section and the lead screw is to adjust the relative posture of the working section 111 and the lead screw groove 32, especially to make the extension direction of the working section along the spiral extension direction of the lead screw groove at the part contacting the lead screw groove, so as to ensure the fit between the working section of the annular rope and the lead screw groove, so as to maximize the protection of the original macroscopic contour accuracy of the lead screw groove. Specifically, the mounting plate 2 is directly or indirectly arranged on a component 5 through the rotating shaft 10. Accordingly, by installing an automatic tensioner similar to a car engine belt, the rotation and tension of the entire annular rope are kept unchanged, and its appropriate stable state is maintained. Under the action of the first driver 6 , the component 5 can move the mounting plate 2 in the radial direction relative to the lead screw 3 to achieve grinding feeding and grinding disengagement between the working section 111 and the lead screw groove 32 .

[0059] Accordingly, the lead screw 3 is mounted on the clamping drive system 4, which clamps the lead screw 3 and drives the lead screw to rotate around the main axis 31, and the relative posture between the working section 111 and the lead screw 3 is adjusted by the activity of the grinding system 1. Figure 3As shown, in this relative posture, the extension direction of the working section 111 at the position contacting the screw groove 32 follows the spiral extension direction of the screw groove 32, that is, the extension direction of the working section 111 forms an acute angle a with the main axis 31, and the sum of the acute angle a and the lead angle γ of the screw groove 32 is 90°. Figure 3 In the figure, the acute angle a is marked as the angle between the center line 112 of the working section 111 and the main axis 31; the lead angle γ is marked as the angle between the center line 112 of the working section 111 and the vertical plane 33 of the main axis 31. The center line 112 of the working section 111 shown in the figure is consistent with the tangent direction of the spirally extended screw groove 32. The working section 111 of the annular rope 11 is brought into contact with the screw groove 32 to achieve grinding feeding, and after the grinding is completed, the working section 111 of the annular rope is evacuated from the screw groove 32 to achieve grinding disengagement. The precision grinding of the screw groove is completed.

[0060] In this embodiment, two Figure 6 In the grinding system 1 shown, the working sections 111 of the annular coils of the two grinding systems are separated on opposite sides of the main axis 31, and the working sections 111 of the annular coils of the two grinding systems are tilted in different directions relative to the main axis to fit with the corresponding screw grooves. When the screw is single-headed, that is, the screw has a spirally extending screw groove, the annular coils of the two grinding systems can grind the same spirally extending screw groove at the same time. When the screw has at least two heads, that is, the screw has a corresponding number of spirally extending screw grooves, the annular coils of the two grinding systems can grind the same spirally extending screw groove at the same time, or grind all the spirally extending screw grooves at the same time. This increases the grinding efficiency.

[0061] In other embodiments, the Figure 7 Grinding system shown replaces Figure 6 System shown. Figure 7 The grinding system shown is a system that surrounds at least two annular ropes 11 in parallel on the wheel set, and the spacing between adjacent annular ropes 11 along the main axis direction is the normal spacing between the adjacent grooves of the screw 3. When the screw is single-headed, that is, the screw has a spirally extending screw groove, at least two annular ropes can be used to repeatedly grind the same spirally extending screw groove at the same time. When the screw has at least two heads, that is, the screw has spirally extending screw grooves corresponding to the number of heads, the spacing between at least two annular ropes can be set to grind the same spirally extending screw groove at the same time, or to grind all spirally extending screw grooves at the same time. This increases the grinding efficiency.

[0062] In this embodiment, the lead screw 3 (main axis 31) is arranged vertically. Correspondingly, the working sections 111 of the annular loop ropes of the two grinding systems are located on the left and right sides of the lead screw.

[0063] Example 2

[0064] Figure 8 Another screw groove grinding device is shown. Compared with the grinding device of Example 1, the screw 3 (main axis 31) is arranged horizontally. This is equivalent to turning the grinding device of Example 1 90 degrees to tilt the screw 3 (main axis 31) to a horizontal arrangement. In this embodiment, only one Figure 6 The grinding system 1 shown. The remaining structure of this embodiment is the same as that of embodiment 1 and will not be described in detail.

[0065] Example 3

[0066] Fig. 9 Another screw groove grinding device is shown. Compared with the grinding device of Example 1, the screw 3 (main axis 31) is also arranged horizontally in this grinding device. This is equivalent to turning the grinding device of Example 1 90 degrees so that the screw (main axis 31) is tilted to a horizontal arrangement. In this embodiment, two Figure 6 The remaining structures of this embodiment are the same as those of embodiment 1 and will not be described in detail.

[0067] Compared with Example 2, this embodiment changes the relative positions of the clamping drive system and the grinding system.

[0068] In the above-mentioned embodiments, grinding can be carried out according to three processes: adjustment-working-ending.

[0069] 1. Adjustment

[0070] The lead screw 3 to be ground is mounted between the first clamp 41 and the second clamp 44 .

[0071] Driven by the first driver 6 , the mounting plate 2 is moved close to the lead screw 3 .

[0072] The slide plate 7 is moved in steps by the second driver 9 so that the working section 111 of the annular rope 11 approaches the screw groove 32 .

[0073] The angle of the mounting plate 2 relative to the main axis 31 (screw 3) is adjusted by the rotating shaft 10, such as Figure 3 As shown, the extension direction of the working section 111 is along the spiral extension direction of the screw groove 32 at the portion contacting the screw groove 32 .

[0074] The mounting plate 2 is then moved by the first driver 6 so that the working section 111 contacts the screw groove 32 (ie contacts the surface of the screw groove 32 ) and maintains a radial pressing force relative to the main axis 31 .

[0075] If grinding systems are configured on both radial sides of the lead screw, the grinding system on the other radial side of the lead screw 3 is adjusted according to the above process.

[0076] After adjustment, the first driver 6 drives the grinding system 1 to move radially back to a parking position away from the screw 3, and the second driver 9 drives the slide 7 to move along the main axis 31 to make the grinding system 1 retreat to the axial processing starting position of the screw.

[0077] 2. Work

[0078] The grinding driver 15 is started, and the driving wheel drives the annular rope 11 to rotate around the wheel set.

[0079] Start the power spindle 42 to drive the lead screw 3 to rotate around the main axis 31 through the first clamp 41; at the same time, under the action of the second driver 9, the slide plate 7 and the annular loop rope 11 of the grinding system are driven to move axially along the direction of the main axis 31.

[0080] The screw 3 rotates around the main axis relative to the working section 111 of the annular rope while synchronously moving axially along the main axis. Therefore, the screw rotates while moving axially along the spiral direction of the screw groove. Rotating the screw 360° once causes the screw to move axially by one lead. The lead is the product of the pitch of adjacent grooves and the number of screw heads. Therefore, when the screw is single-headed, rotating the screw 360° once causes the screw to move axially by one pitch. When the screw is multi-headed, rotating the screw 360° once causes the screw to move axially by one product of the pitch of adjacent grooves and the number of heads.

[0081] The abrasive is added to the grinding contact. Preferably, the abrasive is made into a flowable fluid or paste and poured into the grinding contact by pumping.

[0082] Driven by the first driver 6, the working section 111 contacts the screw groove 32. Driven by the driving wheel 12, the annular rope 11 rotates continuously, and the annular rope 11 is rubbed with the surface of the screw groove by the abrasive to perform grinding.

[0083] As the lead screw 3 moves along the main axis, the spirally extended lead screw groove 32 continuously contacts and rubs with the working section 111 of the annular rope, so that the working section 111 starts grinding the lead screw groove from one end of the lead screw groove to the other end of the lead screw groove. When the working section 111 of the annular rope reaches the position at the other end of the lead screw groove, the electrical signal is triggered, causing the lead screw to reverse and move axially in the opposite direction to the starting point. According to the process requirements, it can be reciprocated several times.

[0084] If a multi-threaded screw is involved, the working sections 111 of the annular rope corresponding to the number of screw heads can be ground together with one groove, and then another groove can be ground after completion; or the working sections 111 of the annular rope corresponding to the number of screw heads can be ground with one groove each at the same time. Figure 7The parallel working sections 111 shown wrapped around the same wheel set can also be working sections 111 of different annular ropes of different grinding systems arranged on the radial side of the screw.

[0085] 3. End

[0086] After the grinding is finished, the mounting plate 2 moves backward under the action of the first driver 6 .

[0087] The power main shaft 42 driving the lead screw to rotate stops rotating synchronously.

[0088] The second driver 9 drives the slide plate 7 to move along the direction of the main axis, so that the working section 111 of the annular coil rope retreats to the processing starting position in the axial direction of the screw.

[0089] Unload the lead screw after the fixture is relaxed.

[0090] In the above working process, the axial feed is achieved by moving the lead screw along the main axis. In other working processes, the axial feed may be achieved by moving the grinding system along the main axis.

[0091] As described above, the grinding device of the present invention realizes the following screw groove grinding method:

[0092] The tensioned annular rope 11 is driven to rotate around the wheel set, and one section of the annular rope 11 is used as a working section 111. The working section 111 contacts the screw groove 32 and moves relative to the screw groove along its own extension direction to grind the surface of the screw groove;

[0093] The lead screw 3 is driven to rotate around the main axis 31, and the annular rope 11 and the lead screw 3 are made to move axially relative to each other along the direction of the main axis 31, so that the working section 111 of the annular rope is made to move spirally relative to the lead screw 3 along the spiral extension direction of the lead screw groove 32 to continuously grind the lead screw groove along the spiral extension direction of the lead screw groove.

[0094] When the working section 111 grinds the screw groove 32 , the grinding agent is directly or indirectly injected into the grinding part.

[0095] The screw 3 and / or the annular rope 11 move along the direction of the main axis 31 so that the screw 3 and the annular rope 11 move axially relative to each other.

[0096] The extension direction of the working section 111 is along the spiral extension direction of the screw groove 32 at the portion contacting the screw groove 32 .

[0097] The same number of annular ropes 11 as the screw grooves 32 are configured so that the working section 111 of each annular rope contacts one screw groove 32 respectively so as to grind all the screw grooves simultaneously.

[0098] Wherein, at least two annular loops 11 are configured, and the at least two annular loops are distributed at different positions of the same screw groove 32 in the spiral extension direction to grind the same screw groove 32 at the same time.

[0099] When there are two or more screw grooves, one annular rope may be used to grind each screw groove one by one, or two or more annular ropes may be used to grind each screw groove one by one simultaneously.

[0100] Among them, due to the various structural forms of the grinding system, such as the different numbers of annular ropes, and the screw may also have one, two or more screw grooves, as mentioned above, the grinding system can be replaced as needed, and the screw grooves of the screw can be ground as needed using the screw groove grinding equipment, such as grinding the screw grooves one by one or simultaneously.

[0101] Among them, Fig.10 As shown, the working section of the same annular loop rope is made to contact the screw grooves of at least two screws at the same time to grind the screw grooves of the two screws at the same time, thereby increasing the grinding efficiency. At this time, the axis lines 31 of at least two screws are parallel to each other, so that the groove projections of adjacent screws are located on a straight line n. Accordingly, the clamping drive system 4 on the device is suitable for clamping a corresponding number of screws 3 and driving these screws to rotate around the main axis 31. Therefore, the same clamping drive system can clamp and drive at least two screws, or each screw can be clamped and driven by a clamping drive system.

[0102] Since the cross-sectional profile of the coil rope is basically close to the profile of the screw groove, the annular coil rope is flexible like the belt in the belt transmission mechanism, and can fit with the screw groove. Under the support of the automatic tensioner, the tension is maintained in contact with the screw groove, and the surface of the screw groove can be precisely ground to improve the surface accuracy of the screw groove.

Claims

1. A method for grinding a screw groove, characterized in that: The tensioned annular rope (11) is driven to rotate around the wheel set, and one section of the annular rope (11) is used as a working section (111). The working section (111) contacts the screw groove (32) and moves relative to the screw groove along its own extension direction to grind the surface of the screw groove; The lead screw (3) is driven to rotate around the main axis (31), and the annular rope (11) and the lead screw (3) are caused to move axially relative to each other along the direction of the main axis (31), so that the working section (111) of the annular rope moves helically relative to the lead screw (3) along the spiral extension direction of the lead screw groove (32) to continuously grind the lead screw groove along the spiral extension direction of the lead screw groove.

2. The method for grinding a screw groove according to claim 1, characterized in that: When the working section (111) grinds the screw groove (32), the grinding agent is directly or indirectly injected into the grinding position.

3. The method for grinding a screw groove according to claim 1, wherein: The lead screw (3) and / or the annular rope (11) move along the direction of the main axis (31) so that the lead screw (3) and the annular rope (11) move relative to each other in the axial direction.

4. The screw groove grinding method according to claim 1, characterized in that: The extension direction of the section (111) is along the spiral extension direction of the screw groove (32) at the position where the section (111) contacts the screw groove (32).

5. The method for grinding a screw groove according to claim 1, wherein: The working section (111) of the same annular loop rope is made to contact the screw grooves (32) of at least two screws at the same time to grind the screw grooves (32) of the two screws at the same time.

6. Screw groove grinding equipment, characterized by include: A clamping drive system (4) for clamping the lead screw (3) and driving the lead screw to rotate around a main axis (31); A grinding system (1) comprises a wheel set and an annular rope (11), wherein the annular rope (11) is wound around the wheel set, is tensioned by the wheel set and is driven to rotate by the wheel set, and the section of the annular rope (11) between two adjacent wheels in the wheel set serves as a working section (111); The clamping drive system (4) and / or the grinding system (1) are movably configured to adjust the relative posture between the working section (111) and the lead screw (3) and the grinding feed and grinding disengagement; The rotation of the screw (3) and the axial movement of the working section (111) relative to the screw groove (32) on the main axis (31) are carried out in a linked and synchronous manner.

7. The screw groove grinding device according to claim 6 is characterized in that: The clamping drive system (4) comprises a first clamp (41), a first seat (43), a power spindle (42), a second clamp (44), and a second seat (45); the first clamp (41) is mounted on the power spindle (42); the power spindle (42) is directly or indirectly arranged on the bed (8) via the first seat (43); and the second clamp (44) is directly or indirectly arranged on the bed (8) via the second seat (45).

8. The screw groove grinding device according to claim 7 is characterized in that: The first seat (43) and / or the second seat (45) can be adjusted in position along the direction of the main axis (31).

9. The screw groove grinding device according to claim 7, characterized in that: The first seat (43) and the second seat (45) can be driven to move synchronously along the direction of the main axis (31).

10. The screw groove grinding device according to claim 6, characterized in that: The working section (111) can rotate around the rotating shaft (10) in a plane containing its center line (112) and parallel to the main axis (31) to adjust the relative posture of the working section (111) and the lead screw (3) and to be locked.

11. The screw groove grinding device according to claim 10, characterized in that: The wheel set comprises a driving wheel (12), a driven wheel (13) and a tensioning wheel (14) which are directly or indirectly arranged on a mounting plate (2); the mounting plate (2) is directly or indirectly arranged on a component (5) via a rotating shaft (10).

12. The screw groove grinding device according to claim 11, characterized in that: The component (5) can move the mounting plate (2) in the radial direction of the lead screw (3) under the action of the first driver (6) to achieve grinding feeding and grinding disengagement between the working section (111) and the lead screw groove (32).

13. The screw groove grinding device according to claim 6, characterized in that: The working section (111) can be driven to move along the direction of the main axis (31).

14. The screw groove grinding device according to claim 13, characterized in that: The wheel set comprises a driving wheel (12), a driven wheel (13) and a tensioning wheel (14) which are directly or indirectly arranged on a mounting plate (2); the mounting plate (2) is directly or indirectly arranged on a component (5) via a rotating shaft (10); the component (5) is directly or indirectly arranged on a slide plate (7); the slide plate (7) is directly or indirectly arranged on a bed (8); the slide plate (7) can be driven by a second driver (9) to move along the direction of a main axis (31).

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