A thread processing clamp suitable for a five-axis numerical control tool grinder

Abstract

The application provides a thread processing clamp suitable for a five-axis numerical control tool grinder and belongs to the technical field of machining equipment. The clamp comprises a rotating table, the upper end of the rotating table is provided with a bearing base, the rear side of the upper end of the bearing base is provided with an outer cover, the inside of the outer cover is provided with a driving unit, and the front side of the outer end of the driving unit is provided with an annular spray body. The eccentric module is arranged. When the workpiece is repeatedly clamped, if the workpiece is eccentric, the outer wall of the workpiece will extrude the contact block. When the contact block is stressed, the eccentric resistance rod will be displaced backward, the resistance ring at the rear end of the eccentric resistance rod will push the gapless transmission pair composed of multiple groups of balls to be displaced downward along the arc-shaped groove inside the splicing end structure of the external arc-shaped block and the positioning block, the annularly distributed centering module will be axially displaced to the inside, and the centering module will be attached to the outer end surface of the workpiece. The automatic centering work of the workpiece is realized, manual adjustment is not needed, the problem that the eccentricity of the workpiece of the existing clamp needs to be manually calibrated is solved, and the machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machining equipment, in particular to a thread machining clamp suitable for a five-axis numerical control tool grinder. BACKGROUND

[0002] The five-axis numerical control grinder is a process test equipment for realizing complex curved surface machining through the control of five movement axes by a numerical control system, and the thread machining clamp of the five-axis numerical control tool grinder is a workpiece fixing device specially designed for the five-axis numerical control tool grinder and mainly used for accurately positioning and clamping the workpiece in the thread machining process.

[0003] At present, the precision control of the thread machining clamp of the existing five-axis numerical control tool grinder mainly depends on the "static dimensional tolerance" (such as the positioning sleeve hole diameter precision and bearing clearance), which cannot offset the dynamic centering deviation caused by the workpiece shape and position error and grinding force deformation in the machining process, which leads to poor thread machining precision. Meanwhile, the existing clamp needs to be frequently manually centered and calibrated when repeatedly clamping the workpiece, which is relatively cumbersome in process operation and affects the machining efficiency. Therefore, the present application provides a thread machining clamp suitable for a five-axis numerical control tool grinder to meet the needs. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a thread machining clamp suitable for a five-axis numerical control tool grinder to solve the problem that the existing thread machining clamp lacks a centering deviation compensation structure, cannot offset the dynamic centering deviation caused by the workpiece shape and position error and grinding force deformation in the machining process, affects the machining precision, and needs to be frequently centered and calibrated when repeatedly clamping the workpiece, which affects the machining efficiency.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] A thread machining clamp suitable for a five-axis numerical control tool grinder, comprising a rotating table, an upper end of the rotating table is provided with a bearing base, a rear side of an upper end of the bearing base is provided with an outer cover, an inside of the outer cover is provided with a driving unit, a front side of an outer end of the driving unit is provided with an annular spray body, a front end of the driving unit is provided with a rotating unit, a front side of the rotating unit is provided with an annular shell, a front end of the annular shell is provided with a pneumatic chuck, an inner side of a front end of the pneumatic chuck is provided with a jaw, a lower end of the annular shell is provided with an annular seat, a middle part of an upper end of the annular seat is provided with a front stable module, an outer side of the front stable module is provided with an octagonal frame, a lower part of the octagonal frame is provided with a positioning module, an inner side of the octagonal frame is provided with an eccentric module, an inner side of a front end of the positioning module is provided with a centering module, an inside of a contact end of the eccentric module and the centering module is provided with a ball bearing, a middle part area of the ball bearing and the centering module is provided with a butterfly spring group.

[0007] Optionally, the front stabilizing module comprises a stabilizing collar, a reinforcing ring, a support rod, a stabilizing hole and a reinforcing hole, the upper end of the stabilizing collar is provided with a reinforcing ring, the lower end of the stabilizing collar is provided with a support rod, the lower side of the outer end of the stabilizing collar is annularly distributed with a stabilizing hole, and the upper end of the reinforcing ring is annularly distributed with a reinforcing hole.

[0008] Optionally, the octagonal frame comprises a frame body, an external arc-shaped block, an internal sleeve block and a support leg, the outer end of the frame body is annularly distributed with an external arc-shaped block, the inner side of the frame body is annularly distributed with an internal sleeve block, and the lower end of the frame body is annularly distributed with a support leg.

[0009] Optionally, the positioning module comprises a positioning block, an embedded cushion block, a rolling groove and an H-shaped groove, the rear inner side of the upper end of the positioning block is provided with an embedded cushion block, the front end of the embedded cushion block is provided with a rolling groove, and the inner side of the front end of the positioning block is provided with an H-shaped groove.

[0010] Optionally, the eccentric module comprises an eccentric abutting rod, a contact block, a limiting ring, an abutting ring and a return spring, the front end of the eccentric abutting rod is provided with a contact block, the rear side of the outer end of the eccentric abutting rod is provided with a limiting ring, the rear side of the limiting ring is provided with an abutting ring, and the middle part of the limiting ring and the abutting ring is sleeved with a return spring.

[0011] Optionally, the centering module comprises a centering wedge block, a limiting groove, an abutting block, an abutting groove and a plug hole, the upper and lower sides of the outer end of the centering wedge block are provided with a limiting groove, the front end of the centering wedge block is provided with an abutting block, the front end of the abutting block is provided with an abutting groove, and the middle part of the rear end of the centering wedge block is provided with a plug hole.

[0012] Optionally, the upper end of the front stabilizing module and the upper end inside the annular shell are in contact with each other, the rear ends of the octagonal frame and the positioning module are spliced with each other, and eleven rolling balls are embedded and installed in the inner side of the spliced end, the rear end of the eccentric module extends to the inside of the structure of the octagonal frame, the rear end of the centering module extends to the inside of the front end of the positioning module, eight groups of the positioning module and the centering module are symmetrically distributed between the positioning module and the centering module, the annular distribution angles of the eight groups of the positioning module and the centering module are the same, and the disc spring group is composed of five stacked discs.

[0013] Optionally, the stabilizing collar and the reinforcing ring are in an integral structure, the support rod is annularly distributed with eight, the opening angles of the stabilizing holes and the installation angles of the support rods are staggered, the reinforcing holes are eight, and the annular distribution angles of the eight reinforcing holes are the same as the annular distribution angles of the support rods.

[0014] Optionally, the frame is composed of eight rectangular rods connected end to end, the eight external arc blocks are annularly distributed, the distribution angle of the external arc blocks is located in the middle of the outer ends of the eight rectangular rods in the frame, the distribution angle of the internal sleeve blocks is located in the middle of the inner sides of the eight rectangular rods in the frame, the interior of the external arc blocks and the interior of the internal sleeve blocks are in communication with each other, and the eight supporting legs are annularly distributed.

[0015] A method for using a thread machining clamp suitable for a five-axis numerical control tool grinder, comprising the following steps:

[0016] Step one: before work, the operator puts the cylindrical workpiece to be ground into the jaw, the rear end of the cylindrical workpiece first contacts the eccentric module, since the eccentric module is annularly distributed as a whole, if the rear end of the cylindrical workpiece is eccentric, the outer wall of the cylindrical workpiece will be extruded against the contact block, when the contact block is stressed, it will drive the eccentric resistance rod as a whole to displace backward;

[0017] Step two: when the eccentric resistance rod as a whole displaces backward, the resistance ring at the rear end thereof will push the gapless transmission pair composed of multiple balls to displace downward along the arc-shaped notch inside the splicing end structure of the external arc block and the positioning block, push the centering module annularly distributed at the lower end to displace axially inward along the annular distribution angle of the eccentric module, so that the front end of the centering module is attached to the outer end surface of the cylindrical workpiece, realizing automatic centering work of the workpiece without manual adjustment;

[0018] Step three: when the centering module realizes centering work on the cylindrical workpiece, a butterfly spring set is installed in the area between the rear side of the centering wedge block and the gapless transmission pair composed of multiple balls, the butterfly spring set is a structure composed of multiple disc pieces, the overall rigidity is superimposed, at the same time, the front end of the butterfly spring set is fixed together with the centering module, the rear end is attached to and pushes against the lowermost ball, always applying a constant pre-tightening force forward at the rear end of the centering module, which can offset the micro-displacement of the workpiece caused by grinding force during the machining process, realizing pure mechanical dynamic centering;

[0019] Step four: after the cylindrical workpiece is centered, the pressure provided by the gas supply equipment connected to the pneumatic chuck pushes the jaw installed at the front end of the pneumatic chuck to close, realizing clamping and fixing of the cylindrical workpiece, when it is necessary to repeatedly clamp the workpiece, the workpiece after machining is taken off the jaw, after the workpiece is taken off, the eccentric module extruded by the outer wall of the workpiece will be driven by the reset spring installed at the rear end to complete the reset work of the eccentric resistance rod, after the new workpiece is installed, the outer wall of the new workpiece will extrude the eccentric module again, and the automatic centering work of the new workpiece is completed by repeating step two above;

[0020] Step five, when the new workpiece is finished centering, it is clamped and fixed by the pneumatic chuck and the claw, and then the rotating table drives the bearing base and the driving unit installed on the rear side of the upper end of the bearing base to turn, so that the angle of the rotating unit installed on the front end of the driving unit and the new workpiece clamped and fixed by the pneumatic chuck and the claw is adjusted, and the grinding head of the grinding machine starts grinding work.

[0021] Compared with the prior art, the present application has at least the following beneficial effects:

[0022] In the above scheme, when the workpiece is repeatedly clamped, if the workpiece is eccentric, the outer wall of the workpiece will extrude the contact block. When the contact block is stressed, it will drive the eccentric resistance rod to displace as a whole to the rear, so that the resistance ring located at the rear end of the eccentric resistance rod pushes the gapless transmission pair composed of multiple groups of balls to displace downward along the arc-shaped groove inside the splicing end structure of the external arc-shaped block and the positioning block, and pushes the centering module distributed in a ring shape to displace axially inward, and is attached to the outer end surface of the workpiece, thereby achieving automatic centering of the workpiece without manual adjustment, solving the problem of manual calibration of the eccentricity of the workpiece in the existing clamp, and improving the processing efficiency.

[0023] The disc spring group is composed of multiple disc plates, and the overall rigidity is superimposed. One end of the disc spring group is fixed with the centering module, and the other end is extruded by the ball, so that a constant pre-tightening force is always applied to the centering module to counteract the micro-displacement of the workpiece caused by the grinding force during the machining process, realize pure mechanical dynamic centering, reduce the half-angle deviation of the thread form, and solve the problem of poor machining accuracy.

[0024] The external arc-shaped block and the positioning block are assembled to form an integral structure inside the arc-shaped groove, and multiple balls with diameters equal to the internal arc-shaped groove are injected into the internal arc-shaped groove to form a gapless transmission pair. Then, the eccentric module pushes the gapless transmission pair composed of multiple groups of balls to extrude the centering module to realize repeated centering of the workpiece. Compared with the traditional mechanical structure, the gapless transmission pair composed of balls improves the accuracy of repeated centering. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the application and, together with the description, further serve to explain the principles of the application and to enable a person skilled in the relevant art to implement and use the application.

[0026] Figure 1 The present application is a three-dimensional structure schematic diagram;

[0027] Figure 2 The present application is a driving unit, a ring-shaped jet body, a rotating unit, a ring-shaped housing and a pneumatic chuck structure assembly schematic diagram;

[0028] Figure 3 It is an exploded schematic view of the three-dimensional structure of the annular housing, annular seat and front stable module of the application;

[0029] Figure 4 It is a schematic view of the three-dimensional structure of the front stable module of the application;

[0030] Figure 5 It is an assembled schematic view of the three-dimensional structure of the octagonal frame, positioning module, eccentric module and centering module of the application;

[0031] Figure 6 It is a schematic view of the three-dimensional structure of the octagonal frame of the application;

[0032] Figure 7 It is a schematic view of the sectional structure of the octagonal frame, positioning module, eccentric module and centering module of the application;

[0033] Figure 8 It is a schematic view of the three-dimensional structure of the eccentric module of the application;

[0034] Figure 9 It is an assembled schematic view of the three-dimensional structure of the positioning module and centering module of the application;

[0035] Figure 10 It is a schematic view of the three-dimensional structure of the centering module of the application;

[0036] Figure 11 It is a schematic view of the three-dimensional structure of the positioning module of the application.

[0037] Reference signs:

[0038] 1, rotating table; 2, bearing base; 3, cover; 4, driving unit; 5, annular spray body; 6, rotating unit; 7, annular housing; 8, pneumatic chuck; 9, claw; 10, annular seat; 11, front stable module; 12, octagonal frame; 13, positioning module; 14, eccentric module; 15, centering module; 16, ball; 17, butterfly spring set; 111, stable collar; 112, reinforcing ring; 113, support rod; 114, stable hole; 115, reinforcing hole; 121, frame body; 122, external arc block; 123, internal sleeve block; 124, support leg; 131, positioning block; 132, embedded pad block; 133, rolling groove; 134, H-shaped groove; 141, eccentric resistance rod; 142, contact block; 143, limiting ring; 144, resistance ring; 145, return spring; 151, centering wedge block; 152, limiting groove; 153, resistance block; 154, resistance groove; 155, insertion hole.

[0039] As shown in the drawings, in order to clearly show the structure of the embodiments of the present application, specific structures and devices are marked in the drawings, but this is only for the need of illustration, and is not intended to limit the present application to the specific structures, devices and environments, and those skilled in the art can adjust or modify these devices and environments according to specific needs. DETAILED DESCRIPTION

[0040] The following will describe in detail a thread machining clamp suitable for a five-axis numerical control tool grinder according to the present application in combination with the drawings and specific embodiments. It should be noted that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and other alternative ways can also be used by those skilled in the art to implement some known technologies; and the drawings are only used to more specifically describe the embodiments, and are not intended to specifically limit the present application.

[0041] It should be noted that in the specification, "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments" and the like indicate that the described embodiment can include a specific feature, structure or characteristic, but not necessarily every embodiment includes the specific feature, structure or characteristic. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, it should be within the knowledge of those skilled in the related art to realize this feature, structure or characteristic in combination with other embodiments (whether or not explicitly described).

[0042] Generally, the terms can be understood at least in part from the context in which they are used. For example, depending on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular or can be used to describe combinations of features, structures, or characteristics, in the plural, without necessarily dictating whether any such feature, structure, or characteristic is required, desired, or necessary only once, or some multiple thereof. Additionally, the term "based on" can be understood as not necessarily of exclusive alternatives, but rather, allowing for additional implicit factors known to those of ordinary skill in the art to exist in some capacity so as to at least partially underlie a decision, action, or statement.

[0043] It can be understood that the meanings of "on", "above", and "over" in the present application should be interpreted in the broadest way, so that "on" not only means "directly on" something, but also includes the meaning of "on" something with intervening features or layers therebetween, and "above" or "over" not only means the meaning of "above" or "over" something, but also can include the meaning of "above" or "over" something without intervening features or layers therebetween.

[0044] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0045] like Figures 1 to 11 As shown, an embodiment of the present invention provides a thread-machining fixture suitable for a five-axis CNC tool grinder, including a rotary table 1, a bearing base 2 at the upper end of the rotary table 1, an outer cover 3 at the rear side of the upper end of the bearing base 2, a drive unit 4 inside the outer cover 3, an annular nozzle 5 at the front side of the outer end of the drive unit 4, a rotating unit 6 at the front end of the drive unit 4, an annular outer shell 7 at the front side of the rotating unit 6, a pneumatic chuck 8 at the front end of the annular outer shell 7, and a clamping device on the inner side of the front end of the pneumatic chuck 8. The claw 9 has an annular seat 10 at the lower end of the annular outer shell 7. A front stabilizing module 11 is provided in the middle of the upper end of the annular seat 10. An octagonal frame 12 is provided on the outside of the front stabilizing module 11. A positioning module 13 is provided below the octagonal frame 12. An eccentric module 14 is provided on the inside of the octagonal frame 12. A centering module 15 is provided on the inside of the front end of the positioning module 13. A ball bearing 16 is provided inside the contact end of the eccentric module 14 and the centering module 15. A butterfly spring assembly 17 is provided in the middle area of ​​the ball bearing 16 and the centering module 15.

[0046] The rotating table 1 is connected with the bearing between the bearing base 2, the outer cover 3 is reinforced with the bearing base 2 between the positioning bolt, the driving unit 4 is embedded in the inside of the outer cover 3, the annular spray body 5 is fixedly sleeved and installed on the front side of the outer end of the driving unit 4, the rotating unit 6 is composed of the outer sealing element and the inner rotating bearing, wherein the outer sealing element of the rotating unit 6 is connected with the front end of the driving unit 4 through the bolt, and the rotating bearing in the rotating unit 6 is connected with the driving motor in the driving unit 4 through the shaft coupling, at the same time, since the internal equipment and the connection mode of the driving unit 4 and the rotating unit 6 are the known mature technology, therefore, the internal structure of the two is not described in detail in this paper, the annular housing 7 and the annular seat 10 are fixedly connected together through the bolt of the outer sealing element of the rotating unit 6, the pneumatic chuck 8 is fixedly installed in the middle of the front end of the annular housing 7, the clamping jaw 9 is positioned between the pneumatic chuck 8 through the positioning pin, then the connecting end of the two is rigidly locked through the bolt, the overall diameter of the annular seat 10 and the overall diameter of the annular housing 7 are matched with each other, and the two are fixed through the outer side annular distributed bolt, the upper end of the front stabilizing module 11 and the upper end inside the annular housing 7 are in contact with each other, the octagonal frame 12 and the rear end of the positioning module 13 are spliced with each other, and eleven balls 16 are embedded and installed in the inner side of the splicing end, at the same time, according to the actual data of the workpiece actually processed, the diameter of each ball 16 can be customized, and the actual use production is used as the criterion, the rear end of the eccentric module 14 extends to the inside of the structure inside the inner side of the octagonal frame 12, the rear end of the centering module 15 extends to the inside of the front end of the positioning module 13, the positioning module 13 and the centering module 15 are symmetrically distributed, and the annular distribution angle of the eight groups of positioning module 13 and centering module 15 is the same, the butterfly spring group 17 is composed of five pieces of disc, the middle of the frontmost end is provided with a cylindrical insert block, and the cylindrical insert block is inserted and installed in the inner side of the rear end of the centering module 15.

[0047] In work, through the setting of the eccentric module 14, when the workpiece is repeatedly clamped, if the workpiece exists eccentricity, the outer wall of the workpiece will extrude the inner side end of the eccentric module 14, when the inner side end of the eccentric module 14 is stressed, the whole eccentric module 14 will be displaced backward, the structure located at the rear end of the eccentric module 14 pushes the transmission structure composed of multiple groups of balls 16 to displace downward along the arc-shaped slot inside the splicing end structure of the octagonal frame 12 and the positioning module 13, the lowermost ball 16 contacts the butterfly spring group 17 to transmit the force, and then pushes the annularly distributed centering module 15 to displace axially inward, and is attached to the outer end surface of the workpiece, so that the automatic centering work of the workpiece is realized, without manual adjustment, the problem that the existing clamp workpiece eccentricity needs manual calibration is solved, time and labor are saved, and the processing efficiency is improved.

[0048] In work, through the setting of the butterfly spring group 17, due to the structure of the combination of multiple disc plates, the overall rigidity is superimposed, at the same time, one end of the butterfly spring group 17 is fixed with the centering module 15, the other end is pushed and extruded by the ball 16, and a constant pre-tightening force is always applied to the centering module 15, which can offset the micro displacement of the workpiece caused by the grinding force during the machining process, realize pure mechanical dynamic centering, avoid the problem of poor machining precision caused by the half-angle deviation of the thread tooth profile.

[0049] As shown in Figures 3 to 4 In the embodiment, the front stabilizing module 11 includes a stabilizing collar 111, a reinforcing ring 112, a support rod 113, a stabilizing hole 114 and a reinforcing hole 115. The upper end of the stabilizing collar 111 is provided with the reinforcing ring 112, the lower end of the stabilizing collar 111 is provided with the support rod 113, the lower end of the outer end of the stabilizing collar 111 is annularly distributed with the stabilizing hole 114, and the upper end of the reinforcing ring 112 is annularly distributed with the reinforcing hole 115.

[0050] The stabilizing collar 111 and the reinforcing ring 112 are in an integral structure, the upper end of the reinforcing ring 112 is attached to the upper end of the inner side of the annular shell 7, the annular shell 7 middle circular hole and the stabilizing collar 111 middle circular hole are taken as the central axis, and the two are installed at a longitudinal linear angle, then the bolts are sequentially penetrated from the upper end of the annular shell 7 and the inside of the reinforcing ring 112 from top to bottom in a ring-shaped distribution angle, and extended to the lower outer side of the reinforcing ring 112, and the nuts are tightened, the support rod 113 is annularly distributed with eight, the upper end of the support rod 113 and the lower end of the stabilizing collar 111 are in an integral structure, at the same time, the opening angle of the stabilizing hole 114 and the installation angle of the support rod 113 are staggered, and the spacing between the mutual staggered is equal, the reinforcing hole 115 is opened with eight, and the annular distribution angle of the eight reinforcing holes 115 is the same as the annular distribution angle of the support rod 113.

[0051] In working, through the setting of the reinforcing ring 112, the upper end is matched with the upper end of the inside of the annular shell 7, and the annular shell 7 and the middle circular hole of the stabilizing ring 111 are coaxial, and the two are installed at a longitudinal linear angle, and then the bolts are used to penetrate the upper end of the annular shell 7 and the inside of the reinforcing ring 112 from top to bottom in a ring-shaped distribution angle, and extend to the outside below the reinforcing ring 112, and the nut is tightened, and at the same time, when the annular shell 7 is assembled with the annular seat 10, the support rod 113 at the lower end of the stabilizing ring 111 is first inserted into the positioning hole at the upper end of the annular seat 10, and the positioning and supporting work is completed, and due to the support of the support rod 113, there is a space between the stabilizing ring 111 and the annular seat 10, which can pass through the front end structure of the centering module 15, and the stable hole 114 is opened below the outer end of the stabilizing ring 111, the annular distribution angle and the height of the stable hole 114 coincide with the distribution angle and the height of the eccentric module 14, and the inner diameter of the stable hole 114 and the outer diameter of the eccentric rod 141 are matched with each other, so that the front end of the eccentric rod 141 can penetrate the stable hole 114 and extend to the inside to install the contact block 142, and the eccentric module 14 can keep the stability of the longitudinal displacement during the later work.

[0052] As shown in Figures 3 to 7 In this embodiment, the octagonal frame 12 includes a frame body 121, an external arc block 122, an internal sleeve block 123, and a support leg 124. The outer end of the frame body 121 is annularly distributed with the external arc block 122, the inside of the frame body 121 is annularly distributed with the internal sleeve block 123, and the lower end of the frame body 121 is annularly distributed with the support leg 124.

[0053] The frame body 121 is composed of eight rectangular rods of the same size and length, and the external arc block 122 and the internal sleeve block 123 are annularly and symmetrically distributed with eight, the inside of the external arc block 122 is provided with an arc-shaped notch of the same size as the rolling groove 133, and the inside of the internal sleeve block 123 is provided with a cylindrical cavity, and the distribution angle of the external arc block 122 is located in the middle region of the outer end of the eight rectangular rods constituting the frame body 121, and the distribution angle of the internal sleeve block 123 is located in the middle region of the inside of the eight rectangular rods constituting the frame body 121, the internal arc-shaped notch of the external arc block 122 and the cylindrical cavity opened in the inside of the internal sleeve block 123 are in communication with each other, the internal sleeve block 123 and the frame body 121 are in threaded connection, the support leg 124 is annularly distributed with eight, and the distribution position of the eight support legs 124 is located at the lower end of the splicing region of the rectangular rods constituting the frame body 121, and the upper end of the support leg 124 and the lower end of the frame body 121 are in one-piece structure, and the lower end of the eight support legs 124 is in contact with the upper end of the annular seat 10 through the bolt reinforcement.

[0054] In work, through the setting frame 121, the outer end middle part and the inner side middle part of the eight rectangular rods constituting the frame 121 can be provided with an integral external arc block 122 and an internal sleeve block 123 respectively, so that the external arc block 122 and the internal sleeve block 123 are distributed at the same annular angle and interval, so that the eccentric module 14 and the centering module 15 can subsequently center the installed workpiece from eight directions, and because the arc-shaped notch in the inner side of the external arc block 122 and the cylindrical cavity in the inner side of the internal sleeve block 123 are in communication with each other, the balls 16 can be injected inside, and then when the frame 121 and the positioning module 13 are assembled, the arc-shaped notch in the inner side of the external arc block 122 and the rolling groove 133 are in communication with each other, so that the balls 16 can displace in the inner side when subjected to force, and the cylindrical notch in the internal sleeve block 123 is provided with the eccentric module 14, which constitutes an upper force with the centering module 15 installed in the positioning module 13 below, which drives the lower side to displace axially inward, achieving automatic centering of the workpiece.

[0055] As shown in Figures 5 to 11 , in the present embodiment, the positioning module 13 comprises a positioning block 131, an embedded pad block 132, a rolling groove 133 and an H-shaped groove 134, the rear inner side of the upper end of the positioning block 131 is provided with the embedded pad block 132, the front end of the embedded pad block 132 is provided with the rolling groove 133, and the inner side of the front end of the positioning block 131 is provided with the H-shaped groove 134.

[0056] The eight positioning blocks 131 are annularly distributed, and the distribution angle and interval between the eight positioning blocks 131 are equal, and the shape of the eight positioning blocks 131 is that the front end is rectangular and the rear end is curved in an arc shape, the inner side of the rectangular structure of the front end of the positioning block 131 is provided with a rectangular cavity, and the inner side of the curved arc structure of the rear end of the positioning block 131 is provided with a rolling groove 133, the upper end of the embedded pad block 132 extends to the inner side of the lower end of the external arc block 122, and the lower end of the embedded pad block 132 and the curved arc structure of the rear end of the positioning block 131 are in an integral structure, wherein the rectangular notch, the rolling groove 133 and the H-shaped groove 134 are in communication with each other, the structure of the front end of the positioning block 131 located at the upper and lower ends of the H-shaped groove 134 is clamped in the limiting groove 152 in the middle of the upper and lower ends of the centering wedge block 151, for controlling the extension and contraction range of the centering wedge block 151, and plays a limiting role.

[0057] In work, through the setting of the embedded pad 132, because of the integral structure between its lower end and the positioning block 131, and the upper end extends to the inside of the lower end of the external arc block 122, the positioning block 131 and the external arc block 122 complete splicing, and keep the function of limiting and fixing, and because the rolling groove 133 is connected with the internal rectangular cavity of the front end of the positioning block 131, after the splicing of the positioning block 131 and the external arc block 122, it is also connected with the arc slot in the internal of the external arc block 122, which is convenient for the displacement of the ball 16, and secondly, through the setting of the H-shaped groove 134, because the upper and lower middle parts of the contact end of the positioning block 131 can be clamped in the limiting groove 152 in the upper and lower middle parts of the centering wedge block 151, it can be used to control the extension and contraction range of the centering wedge block 151, and play the role of clamping and limiting.

[0058] As shown in Figures 5 to 8 In the embodiment, the eccentric module 14 includes an eccentric rod 141, a contact block 142, a limiting ring 143, a resisting ring 144 and a reset spring 145. The front end of the eccentric rod 141 is provided with the contact block 142. The rear side of the outer end of the eccentric rod 141 is provided with the limiting ring 143. The rear side of the limiting ring 143 is provided with the resisting ring 144. The middle part of the limiting ring 143 and the resisting ring 144 is sleeved with the reset spring 145.

[0059] The eccentric rod 141 and the contact block 142 are in threaded installation. Meanwhile, the contact block 142 can be customized with appropriate size, shape and material according to production needs. The eccentric rod 141 and the limiting ring 143 are in integral structure. The front end of the resisting ring 144 is welded with a cylindrical sleeve. The rear end of the resisting ring 144 is provided with an arc groove. The inner side of the arc groove is matched with the arc of the outer side of the ball 16. The cylindrical sleeve and the rear end of the eccentric rod 141 are in mutual sleeving. The reset spring 145 is installed outside the mutual sleeving.

[0060] In work, through the setting of the resisting ring 144, because the cylindrical sleeve at the front end is in mutual sleeving with the rear end of the eccentric rod 141, when the front end contact block 142 is extruded by the outer wall of the workpiece, it will shrink back into the cylindrical sleeve at the front end of the resisting ring 144, and then extrude the resisting ring 144 to displace backward, so that the arc groove at the rear end of the resisting ring 144 contacts with the ball 16, and the extrusion force is transmitted to the gapless transmission pair composed of multiple balls 16, which is convenient for pushing the centering module 15 below to displace axially forward, so as to complete the centering work of the workpiece. Meanwhile, when the force on the contact block 142 disappears, the reset spring 145 at the rear end of the limiting ring 143 will extrude the eccentric rod 141 to reset forward, so as to repeat the centering work subsequently.

[0061] As shown in Figures 5 to 10As shown, in this embodiment, the centering module 15 includes a centering wedge 151, a limiting groove 152, a stop block 153, a stop groove 154, and a insertion hole 155. The limiting groove 152 is formed on the upper and lower sides of the outer end of the centering wedge 151. The front end of the centering wedge 151 is provided with the stop block 153. The front end of the stop block 153 is provided with the stop groove 154. The middle part of the rear end of the centering wedge 151 is provided with the insertion hole 155.

[0062] The centering wedge 151 and the stop block 153 are mutually sleeved. The limiting groove 152 is symmetrically formed on the middle part of the upper and lower ends of the centering wedge 151. The stop block 153 has a trapezoidal structure. The inner side of the front end of the trapezoidal structure is provided with the stop groove 154. The middle part of the rear end of the trapezoidal structure extends to the inside of the front end of the centering wedge 151. The inner diameter of the insertion hole 155 and the outer diameter of the cylindrical block provided in the middle part of the front end of the butterfly spring group 17 are mutually matched.

[0063] In work, the centering wedge 151 is embedded and installed in the inside of the front end of the positioning block 131 of the positioning module 13. Since the H-shaped groove 134 and the upper and lower ends of the contact end of the positioning block 131 can be clamped in the limiting groove 152 formed in the middle part of the upper and lower ends of the centering wedge 151, the range of extension and contraction of the centering wedge 151 can be controlled. The butterfly spring group 17 can be embedded and installed in the rear end of the centering wedge 151 through the insertion hole 155. The front end of the centering wedge 151 provides an axial force that is always inward. The front end of the centering wedge 151 installed against the stop block 153 is always attached to the outer wall of the workpiece. The micro displacement of the workpiece caused by the grinding force can be offset. The pure mechanical dynamic centering is realized. The problem that the machining precision is poor due to the half-angle deviation of the thread form is avoided.

[0064] A method for using a thread machining clamp suitable for a five-axis numerical control tool grinder includes the following steps:

[0065] Step one, before work, the operator puts the cylindrical workpiece that needs to be ground into the jaw 9. The rear end of the cylindrical workpiece first contacts the eccentric module 14. Since the eccentric module 14 is annularly distributed as a whole, if the rear end of the cylindrical workpiece is eccentric, the outer wall of the cylindrical workpiece will press the contact block 142. When the contact block 142 is forced, it will drive the eccentric stop rod 141 to move backward as a whole.

[0066] Step two, when the eccentric stop rod 141 moves backward as a whole, the stop ring 144 at the rear end thereof pushes the gapless transmission pair composed of multiple groups of balls 16 to move downward along the arc-shaped groove in the inside of the splicing end structure of the outer arc-shaped block 122 and the positioning block 131. The lower end annularly distributed centering module 15 is pushed to move inward along the annular distribution angle of the eccentric module 14, so that the front end of the centering module 15 is attached to the outer end surface of the cylindrical workpiece, and the automatic centering work of the workpiece is realized without manual adjustment.

[0067] Step three, when the centering module 15 in the implementation of the cylindrical workpiece centering work, in the area between the rear side of the centering wedge 151 and the gapless transmission pair composed of multiple groups of balls 16, butterfly spring group 17 is installed, butterfly spring group 17 is composed of multiple pieces of disc combination structure, the overall stiffness is superimposed, at the same time, the front end of butterfly spring group 17 is fixed with the centering module, the rear end is in contact with the lowermost ball 16 to push and extrude, always exerting a constant pre-tightening force on the rear end of the centering module 15, which can offset the micro displacement of the workpiece caused by the grinding force during processing, and realize pure mechanical dynamic centering;

[0068] Step four, when the cylindrical workpiece is centered, the gas supply equipment connected with the pneumatic chuck 8 provides pressure to drive the clamping jaw 9 installed at the front end of the pneumatic chuck 8 to close, so as to realize the clamping and fixing of the cylindrical workpiece. When it is necessary to repeatedly clamp the workpiece, the clamping jaw 9 is taken off after the workpiece is taken off, the eccentric module 14 extruded by the workpiece outer wall will be driven by the reset spring 145 installed at the rear end to complete the reset work of the eccentric resistance rod 141. After the new workpiece is installed, the outer wall of the new workpiece will extrude the eccentric module 14 again, and the above step two will be repeated to complete the automatic centering work of the new workpiece.

[0069] Step five, when the new workpiece is centered, it is clamped and fixed by the pneumatic chuck 8 and the clamping jaw 9. The subsequent rotation of the rotating table 1 drives the bearing base 2 and the driving unit 4 installed at the rear side of the upper end of the bearing base 2 to turn, so that the rotation unit 6 installed at the front end of the driving unit 4 and the new workpiece clamped and fixed by the pneumatic chuck 8 and the clamping jaw 9 are adjusted in angle, and the grinding head of the grinding machine starts grinding work.

[0070] The technical scheme provided by the present application has the following working principles: firstly, through the eccentric module 14, when the workpiece is repeatedly clamped, if the workpiece has eccentricity, the outer wall of the workpiece will extrude the contact block 142, when the contact block 142 is stressed, the eccentric resistance rod 141 will be displaced as a whole to the rear, the resistance ring 144 at the rear end of the eccentric resistance rod 141 will push the gapless transmission pair composed of multiple groups of balls 16 to displace downward along the arc-shaped groove inside the splicing end structure of the external arc-shaped block 122 and the positioning block 131, the centering module 15 distributed in a ring shape will be axially displaced inward, and be attached to the outer end surface of the workpiece, so that the automatic centering work of the workpiece is realized, manual adjustment is not needed, the problem that the eccentricity of the workpiece of the existing clamp needs to be manually calibrated is solved, and the machining efficiency is improved; secondly, through the butterfly spring group 17, since the butterfly spring group 17 is composed of multiple disc pieces, the overall rigidity is superimposed, meanwhile, one end of the butterfly spring group 17 is fixed with the centering module 15, and the other end is extruded and pressed by the balls 16, so that a constant pre-tightening force for tightly pressing inward is always applied to the centering module 15, in the machining process, the micro displacement of the workpiece caused by the grinding force can be offset, the dynamic centering of pure machinery is realized, the problem that the half-angle deviation of the thread tooth form causes the machining precision to be poor is avoided; and moreover, through the external arc-shaped block 122 and the positioning block 131, after the two are spliced, the internal arc-shaped groove forms an integrated structure, meanwhile, multiple balls 16 with diameters equal to the internal arc-shaped groove are injected into the internal arc-shaped groove, so that a gapless transmission pair is formed, and then the gapless transmission pair composed of multiple groups of balls 16 is pushed by the eccentric module 14 to extrude the centering module 15 to realize the repeated centering of the workpiece, compared with the traditional mechanical structure, the gapless transmission pair composed of the balls 16 improves the precision of the repeated centering.

[0071] The present application encompasses any substitutions, modifications, equivalent methods and solutions made on the essence and scope of the present application. In order for the public to have a thorough understanding of the present application, specific details are described in the following preferred embodiments of the present application, and the present application can also be completely understood without the description of these details for those skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the present application, well-known methods, processes, procedures, elements and circuits are not described in detail.

[0072] The above is only the preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can also be made, which should also be regarded as the protection scope of the present application.

Claims

1. A thread machining jig suitable for use with a five-axis CNC tool grinder, characterized by, The utility model relates to a rotary table, the upper end of the rotary table is equipped with a bearing base, the rear side of the upper end of the bearing base is equipped with an outer cover, the inside of the outer cover is equipped with a drive unit, the front side of the outer end of the drive unit is equipped with an annular spray body, the front end of the drive unit is equipped with a rotary unit, the front side of the rotary unit is equipped with an annular shell, the front end of the annular shell is equipped with a pneumatic chuck, the inside of the front end of the pneumatic chuck is equipped with a claw, the lower end of the annular shell is equipped with an annular seat, the middle part of the upper end of the annular seat is equipped with a front stable module, the outside of the front stable module is equipped with an octagonal frame, the lower side of the octagonal frame is equipped with a positioning module, the inside of the octagonal frame is equipped with an eccentric module, the inside of the front end of the positioning module is equipped with a centering module, the inside of the contact end of the eccentric module and the centering module is equipped with a ball, the middle part area of the ball and the centering module is equipped with a butterfly spring group. The front stable module comprises a stable collar, a reinforcing ring, a support rod, a stable hole and a reinforcing hole, the upper end of the stable collar is equipped with a reinforcing ring, the lower end of the stable collar is equipped with a support rod, the lower side of the outer end of the stable collar is annularly distributed with a stable hole, the upper end of the reinforcing ring is annularly distributed with a reinforcing hole. The octagonal frame comprises a frame body, an external arc block, an internal sleeve block and a support leg, the outer end of the frame body is annularly distributed with an external arc block, the inside of the frame body is annularly distributed with an internal sleeve block, the lower end of the frame body is annularly distributed with a support leg. The positioning module comprises a positioning block, an embedded pad block, a rolling groove and an H-shaped groove, the rear inside of the upper end of the positioning block is equipped with an embedded pad block, the front end of the embedded pad block is provided with a rolling groove, the inside of the front end of the positioning block is provided with an H-shaped groove. The eccentric module comprises an eccentric resistance rod, a contact block, a limiting ring, a resistance ring and a return spring, the front end of the eccentric resistance rod is equipped with a contact block, the rear side of the outer end of the eccentric resistance rod is equipped with a limiting ring, the rear side of the limiting ring is equipped with a resistance ring, the middle part area of the limiting ring and the resistance ring is sleeved with a return spring. The centering module comprises a centering wedge block, a limiting groove, a resistance block, a resistance groove and a jack, the upper and lower sides of the outer end of the centering wedge block are provided with a limiting groove, the front end of the centering wedge block is equipped with a resistance block, the front end of the resistance block is provided with a resistance groove, the middle part of the rear end of the centering wedge block is provided with a jack. The upper end of the front stable module and the inside of the upper end of the annular shell are in contact with each other, the rear end of the octagonal frame and the positioning module are spliced with each other, the inside of the spliced end is embedded with eleven balls, the rear end of the eccentric module extends to the inside of the structure of the inside of the octagonal frame, the rear end of the centering module extends to the inside of the front end of the positioning module, eight groups of the positioning module and the centering module are symmetrically distributed between the positioning module and the centering module, the annular distribution angle of the eight groups of the positioning module and the centering module is the same, and the butterfly spring group is composed of five disc pieces stacked and combined.

2. The thread cutting jig suitable for use in a five-axis CNC tool grinder according to claim 1, characterized in that, The stable collar and the reinforcing ring are in an integral structure, the support rods are annularly distributed in eight, the stable holes are staggered in the setting angle and the installation angle of the support rods, the reinforcing holes are eight, and the annular distribution angle of the eight reinforcing holes is the same as the annular distribution angle of the support rods.

3. The thread cutting fixture suitable for use in a five-axis CNC tool grinder according to claim 1, wherein, The frame body is composed of eight rectangular rods connected end to end, eight external arc blocks are annularly distributed, and the distribution angle of the external arc blocks is located in the middle of the outer ends of the eight rectangular rods in the frame body, the distribution angle of the internal sleeve blocks is located in the middle of the inner sides of the eight rectangular rods in the frame body, the interior of the external arc blocks and the interior of the internal sleeve blocks are in communication with each other, and the eight supporting legs are annularly distributed.

4. The method of using a thread cutting fixture for a five-axis CNC tool grinder as defined in claim 1, wherein, It comprises the following steps: Step one: before working, the operator puts the cylindrical workpiece to be ground into the jaw, the rear end of the cylindrical workpiece first contacts the eccentric module, since the eccentric module is annularly distributed as a whole, if the rear end of the cylindrical workpiece is eccentric, the outer wall of the cylindrical workpiece will be extruded by the contact block, when the contact block is stressed, it will drive the whole eccentric resistance rod to move backward; Step two: when the whole eccentric resistance rod moves backward, the resistance ring at the rear end will push the gapless transmission pair composed of multiple groups of balls to move downward along the arc-shaped notch inside the splicing end structure of the external arc block and the positioning block, push the centering module annularly distributed at the lower end to move axially inward along the annular distribution angle of the eccentric module, so that the front end of the centering module is attached to the outer end surface of the cylindrical workpiece, realizing automatic centering of the workpiece without manual adjustment; Step three: when the centering module realizes centering of the cylindrical workpiece, a butterfly spring group is installed in the area between the rear side of the centering wedge block and the gapless transmission pair composed of multiple groups of balls, the butterfly spring group is composed of multiple disc pieces, the overall rigidity is superimposed, at the same time, the front end of the butterfly spring group is fixed with the centering module, and the rear end is attached to the lowermost ball to push and extrude, always applying a constant pre-tightening force to the rear end of the centering module, which can offset the micro displacement of the workpiece caused by grinding force during processing, realizing pure mechanical dynamic centering; Step four: after the cylindrical workpiece is centered, the gas supply equipment connected to the pneumatic chuck provides pressure to push the jaw installed at the front end of the pneumatic chuck to close, realizing clamping and fixing of the cylindrical workpiece, when it is necessary to repeatedly clamp the workpiece, the finished workpiece on the jaw is removed, after the workpiece is removed, the eccentric module extruded by the outer wall of the workpiece will be driven by the reset spring installed at the rear end to complete the reset of the eccentric resistance rod, then when a new workpiece is installed, the outer wall of the new workpiece will extrude the eccentric module again, repeating step two to complete the automatic centering of the new workpiece; Step five: after the new workpiece is centered, it is clamped and fixed by the pneumatic chuck and the jaw, then under the action of the rotating table, the driving unit installed at the upper end of the rear side of the bearing base is turned to adjust the angle of the rotating unit installed at the front end of the driving unit and the new workpiece clamped and fixed by the pneumatic chuck and the jaw, and the grinding work of the grinding head of the grinding machine is started.

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