A center mount clamping device and method of use

Abstract

The application provides a center frame clamping device and a use method, and relates to the technical field of cutting processing of long barrel type parts. The center frame clamping device comprises a center frame body, three clamping rods and three extension assemblies. The clamping rods are uniformly arranged on the center frame body and are moved towards the direction of approaching or deviating from the central axis of the center frame body. The extension assemblies are arranged one by one on the clamping rods. The extension assembly comprises an extension shaft and a support. The extension shaft is arranged at the end of the clamping rod close to the central axis of the center frame body. The support is arranged on the extension shaft to support the workpiece. The center frame clamping device of the application increases the clamping range of the center frame and can clamp eccentric workpieces.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cutting processing of long barrel parts, and particularly relates to a center rest clamping device and a use method. BACKGROUND

[0002] At present, the processing scheme for the outer circle and the inner hole of a long barrel part is very mature, and mainly uses a large horizontal lathe or a turning-milling compound machine tool for processing.

[0003] When the inner circle is processed, a center rest is used to provide support for the part and reduce the sag of the workpiece due to gravity. The center rest has three supports which are respectively abutted on the surface of the workpiece to support the workpiece, so as to ensure the coaxiality of the processed workpiece and meet the radial runout requirement.

[0004] However, the clamping range of the center rest has certain limitations, especially the mechanical center rest used on a traditional horizontal lathe, which cannot effectively clamp a workpiece with a small diameter, and the application range is narrow. SUMMARY

[0005] The present application provides a center rest clamping device and a use method to solve the problem that the center rest on a traditional lathe cannot effectively clamp a workpiece with a small diameter.

[0006] In one aspect, the present application provides a center rest clamping device, comprising a center rest body, three clamping rods and three extension assemblies;

[0007] The clamping rods are uniformly arranged on the center rest body and are moved towards or away from the central axis of the center rest body, and the extension assemblies are one-to-one correspondingly arranged on the clamping rods.

[0008] The extension assembly comprises an extension shaft and a support piece, the extension shaft is arranged at the end of the clamping rod close to the central axis of the center rest body, and the support piece is arranged on the extension shaft to support the workpiece.

[0009] In some embodiments, the support piece comprises a sleeve, a pin shaft and a support roller, the sleeve is arranged at the end of the extension shaft, the support roller is rotatably sleeved on the pin shaft, the pin shaft is arranged in the sleeve, and the support roller is used to abut against the workpiece.

[0010] In some embodiments, the support roller is a rolling bearing, and the outer ring of the rolling bearing is used to abut against the workpiece.

[0011] In some embodiments, the support roller is a rolling bearing.

[0012] In some embodiments, the surface of the rolling roller is provided with an embossed pattern.

[0013] In some embodiments, the support roller is a cam tooth disc, and the support member further comprises a tooth ring for sleeving on the eccentric workpiece, and the cam tooth disc is engaged with the tooth ring.

[0014] In some embodiments, the pin shaft comprises a limiting portion, a first connecting portion, a mounting portion and a second connecting portion connected in sequence, the limiting portion, the first connecting portion, the mounting portion and the second connecting portion are sequentially reduced in diameter, and the support roller is sleeved on the mounting portion.

[0015] In some embodiments, a through hole is formed on the second connecting portion, and a split pin is arranged in the through hole, and the length of the split pin is greater than the diameter of the second connecting portion.

[0016] In some embodiments, a retaining ring is sleeved on the second connecting portion, and the retaining ring abuts against the side wall of the support roller.

[0017] In another aspect, the application provides a method for using the center frame clamping device, using the center frame clamping device, the method comprising:

[0018] First, the support member is installed on the extension shaft;

[0019] Then, the extension shaft is installed on the clamping rod one by one;

[0020] The positions of the three clamping rods are adjusted respectively, so that the support members abut against the circumferential wall of the workpiece, and the roundness tolerance of the workpiece is within 0.05mm.

[0021] The center frame clamping device and the method for using the same provided by the application, the center frame clamping device extends the clamping range of the clamping rod by installing the extension assembly on the three clamping rods respectively, the extension shaft on the extension assembly is located at the end of the clamping rod close to the central axis, and the support member is arranged on the extension shaft. In the use process, the three support members abut against the workpiece respectively to realize the support of the workpiece. By arranging the extension shaft and the support member, the length of the clamping rod is extended, and the limitation of the relatively thick end of the clamping rod on the size of the workpiece is reduced, so as to facilitate the clamping of the small-diameter workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the application and, together with the specification, serve to explain the principles of the application.

[0023] Figure 1 The structural schematic diagram of the center frame clamping device provided by the embodiments of the application is shown in the figure;

[0024] Figure 2 The structural schematic diagram of the center frame clamping device provided by the embodiments of the application is shown in the figure; Figure 1 The structural schematic diagram of the center frame clamping device provided by the embodiments of the application is shown in the figure;

[0025] Figure 3 Fig. 1 is a structural schematic view of a center frame body; Figure 2 Fig. 2 is a structural schematic view of a center frame body;

[0026] Figure 4 Fig. 3 is a structural schematic view of a center frame body; Figure 1 Fig. 4 is a structural schematic view of a center frame body when a support roller is used as a workpiece;

[0027] Figure 5 Fig. 5 is a structural schematic view of a center frame clamping device when a workpiece is eccentrically clamped.

[0028] Legend of reference signs:

[0029] 1 - workpiece;

[0030] 100 - center frame body;

[0031] 200 - clamping rod;

[0032] 300 - extension assembly; 310 - extension shaft; 320 - support; 321 - sleeve; 322 - pin shaft; 3221 - limiting portion; 3222 - first connecting portion; 3223 - mounting portion; 3224 - second connecting portion; 3225 - through hole; 323 - support roller; 324 - gear ring; 325 - check ring.

[0033] The specific embodiments have been shown and described in the foregoing drawings and specification. These drawings and description, however, are to be regarded as illustrative in nature and no limitations are to be imposed on the scope of the application by the drawings and description. Rather, any or all such embodiments can take many different forms without departing from the spirit of the application, which is set forth in the following claims. DETAILED DESCRIPTION

[0034] The exemplary embodiments will be described in detail herein below with reference to the drawings. In the following description, the same drawings reference numerals are used to denote like elements, unless otherwise specified. The embodiments described in the following exemplary embodiments are not representative of all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0035] It should be noted that the terms "first", "second", and the like, are used to describe various elements, but are not meant to be limiting or to imply relative importance or a number of the indicated elements. Thus, features defined with "first", "second" can include at least one of the features, either explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0036] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "fix", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] At present, the processing scheme of the outer circle and the inner hole of the long barrel part is very mature, and mainly uses large horizontal lathe or turning and milling composite machine tool for processing.

[0039] When processing the inner circle, the center support is used to provide support for the part to reduce the sag of the workpiece due to gravity. The center support is three supports respectively abutting on the surface of the workpiece, supporting the workpiece to ensure the coaxiality of the machined workpiece and meet the radial runout requirement.

[0040] However, the clamping range of the center support has certain limitations, especially the mechanical center support used on the traditional horizontal lathe. The clamping rod of the center support is relatively thick. When three clamping rods are used to clamp a workpiece with a small diameter, interference between the clamping rods is easy to occur, and the workpiece is easy to jump. Therefore, effective clamping of the workpiece with a small diameter cannot be achieved, and the scope of application is narrow.

[0041] In order to solve the above problems, the present application provides a center support clamping device and a using method. The center support clamping device extends the clamping range of the clamping rod by installing an extension assembly on each of the three clamping rods. The extension shaft on the extension assembly is located at the end of the clamping rod close to the center axis, and the support is arranged on the extension shaft. In the use process, the three supports are respectively abutted with the workpiece to realize the support of the workpiece. By arranging the extension shaft and the support, the length of the clamping rod is extended, the limitation of the relatively thick end of the clamping rod to the size of the workpiece is reduced, and the clamping of the small diameter workpiece is facilitated.

[0042] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes can not be described again in some examples. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0043] In one aspect, the present application provides a center clamp device, referring to Figure 1 、 Figure 2 and Figure 3 , the center clamp device comprises a center body 100, three clamping rods 200 and three extension assemblies 300.

[0044] The clamping rods 200 are evenly arranged on the center body 100 and are moved towards the direction of approaching or away from the central axis of the center body 100, and the extension assemblies 300 are arranged one by one on the clamping rods 200.

[0045] The extension assembly 300 comprises an extension shaft 310 and a support 320, the extension shaft 310 is arranged at the end of the clamping rod 200 close to the central axis of the center body 100, and the support 320 is arranged on the extension shaft 310 for supporting the workpiece 1.

[0046] By adopting the above technical solution, when the center clamp device needs to be used to clamp a smaller diameter rotary workpiece 1 on a machine tool, the position of the clamping rod 200 is adjusted so that the clamping rod 200 is away from the axis of the center body 100, and then the extension shaft 310 is installed at the end of the clamping rod 200 close to the central axis of the center body 100; the center body 100 is moved to the workpiece 1, the position of the clamping rod 200 is adjusted so that the supports 320 on the three clamping rods 200 are respectively in abutment with the side wall of the workpiece 1, and the alignment is performed so that the roundness tolerance of the workpiece 1 is within 0.05mm, thereby realizing the clamping of the smaller diameter workpiece 1.

[0047] Further, by replacing the extension shaft 310 of different lengths, the clamping range of the device can be adjusted, and the applicability of the device is improved.

[0048] In the clamping process of the workpiece 1, the roundness tolerance is detected by using a dial gauge. In the embodiments of the present application, the dial gauge is adsorbed to the center body 100, and then the roundness tolerance of the clamped workpiece 1 is detected.

[0049] In some embodiments, the support 320 comprises a sleeve 321, a pin shaft 322 and a support roller 323, the sleeve 321 is arranged at the end of the extension shaft 310, the support roller 323 is rotatably sleeved on the pin shaft 322, the pin shaft 322 is arranged in the sleeve 321, and the support roller 323 is used to abut against the workpiece 1.

[0050] The extension shaft 310 is a hollow circular tube at the middle part, and is detachably connected to the end of the clamping rod 200.

[0051] For example, the extension shaft 310 is sleeved on the clamping rod 200, and a plurality of fixing holes are formed on the side wall of the extension shaft 310. When the extension shaft 310 is installed, the extension shaft 310 is sleeved on the end of the clamping rod 200, and the bolts are used to connect the extension shaft 310 and the clamping rod 200 through the fixing holes, so that the extension shaft 310 and the clamping rod 200 are detachably connected.

[0052] In other embodiments, the extension shaft 310 and the clamping rod 200 can also be connected by buckling or other methods, which are not limited here.

[0053] For example, the sleeve 321 is detachably connected to the extension shaft 310, the outer side of the sleeve 321 is provided with a mounting ring, a plurality of first connecting holes are formed on the mounting ring, and a second connecting hole is formed on the end of the extension shaft 310. The first connecting holes and the second connecting holes are arranged one by one. When the sleeve 321 is installed, the first connecting holes on the sleeve 321 and the second connecting holes on the extension shaft 310 are arranged one by one, and then the screws are used to threadedly connect the first connecting holes and the second connecting holes, so that the sleeve 321 and the extension shaft 310 are detachably connected.

[0054] In other embodiments, the sleeve 321 and the extension shaft 310 can also be detachably connected by buckling or other methods, which are not limited here.

[0055] The sleeve 321 is provided with a mounting groove, and the mounting groove penetrates one end of the sleeve 321 away from the extension shaft 310. The sleeve 321 is also provided with a mounting hole, and the central axis of the mounting hole is perpendicular to the length direction of the mounting groove. The support roller 323 is installed in the mounting groove, and the pin shaft 322 passes through the mounting hole to install the support roller 323. After the support roller 323 is sleeved on the pin shaft 322, the support roller 323 extends partially outside the sleeve 321, so as to abut against the workpiece 1.

[0056] For example, the support roller 323 is a circular ring, and the support roller 323 is rotatably sleeved on the pin shaft 322.

[0057] When the support roller 323 abuts against the workpiece 1, the workpiece 1 drives the support roller 323 to rotate synchronously with the workpiece 1 through the friction between the workpiece 1 and the support roller 323 during the rotation of the workpiece 1, so as to facilitate the rotation machining of the workpiece 1 after clamping, and reduce the change of the round runout tolerance of the workpiece 1 caused by the separation of the workpiece 1 and the support roller 323 during the subsequent machining of the workpiece 1, so as to improve the machining quality of the workpiece 1 and the qualified rate of product machining.

[0058] In some embodiments, reference is made to Figure 2And Figure 3 The pin shaft 322 comprises a limiting portion 3221, a first connecting portion 3222, a mounting portion 3223 and a second connecting portion 3224 connected in sequence, and the diameters of the limiting portion 3221, the first connecting portion 3222, the mounting portion 3223 and the second connecting portion 3224 decrease in sequence. The supporting roller 323 is sleeved on the mounting portion 3223.

[0059] The limiting portion 3221 abuts against the outer side wall of the sleeve 321 to limit the pin shaft 322 from passing through the mounting hole. The diameter of the limiting portion 3221 is greater than the diameter of the limiting hole. The diameter of the mounting hole is adapted to the first connecting portion 3222 and the second connecting portion 3224, so that the first connecting portion 3222 and the second connecting portion 3224 of the pin shaft 322 are closely fitted with the inner side wall of the mounting hole, reducing the movement of the pin shaft 322 in the mounting hole, and further reducing the influence on the roundness tolerance of the workpiece 1. The mounting hole is in communication with the mounting groove.

[0060] When the pin shaft 322 is inserted into the mounting hole, part of the first connecting portion 3222, the mounting portion 3223 and part of the second connecting portion 3224 are located in the mounting groove. The supporting roller 323 is sleeved in the mounting groove and abuts against the step between the first connecting portion 3222 and the mounting portion 3223 to limit the supporting roller 323.

[0061] In some embodiments, referring to Figure 2 And Figure 3 The supporting roller 323 is a rolling bearing, and the outer ring of the rolling bearing is used to abut against the workpiece 1.

[0062] By adopting the above-mentioned embodiments, the rolling bearing is used as the supporting roller 323, the inner ring of the rolling bearing is sleeved on the mounting portion 3223 of the pin shaft 322 and abuts against the step between the first connecting portion 3222 and the mounting portion 3223 to limit the side of the rolling bearing. Moreover, the outer ring of the rolling bearing extends to the outside of the mounting groove to abut against the workpiece 1. In use, the outer rings of the three rolling bearings on the clamping rods 200 respectively abut against the surface of the workpiece 1 in the circumferential direction and abut tightly against the workpiece 1 to support the workpiece 1 with a smaller diameter. At the same time, in the process of rotating the workpiece 1 driven by the machine tool, the workpiece 1 drives the outer rings of the three rolling bearings to rotate synchronously through the friction force between the workpiece 1 and the outer rings of the rolling bearings, so that the workpiece 1 is clamped all the time in the rotating process, thereby improving the clamping effect of the workpiece 1 and improving the qualified rate of the workpiece 1.

[0063] The second connecting portion 3224 is sleeved with a check ring 325, and the check ring 325 abuts against the side wall of the supporting roller 323.

[0064] One side of the retaining ring 325 abuts against the side wall of the supporting roller 323, and the other side abuts against the side wall of the mounting groove and matches the step between the first connecting portion 3222 and the mounting portion 3223, thereby achieving the limiting and fixing of the supporting roller 323 and reducing the shaking of the supporting roller 323 on the pin shaft 322.

[0065] For example, one side of the retaining ring 325 abuts against the inner ring of the rolling bearing.

[0066] The second connecting portion 3224 is provided with a through hole 3225, and a split pin is arranged in the through hole 3225, and the length of the split pin is greater than the diameter of the second connecting portion 3224.

[0067] The through hole 3225 penetrates the second connecting portion 3224, and the split pin is arranged in the through hole 3225; and the two ends of the split pin extend out of the through hole 3225, so as to limit the possibility of the pin shaft 322 from being separated from the mounting hole and improve the stability of the connection of the pin shaft 322.

[0068] In some embodiments, referring to Figure 4 , the supporting roller 323 is a roller.

[0069] In this embodiment, the supporting roller 323 is set as a roller, and the roller is sleeved on the pin shaft 322 in the same way. When the surface of the workpiece 1 needs to be strengthened, the workpiece 1 is directly clamped, the rollers on the three clamping rods 200 abut against the outer side wall of the workpiece 1, and the workpiece 1 is slowly rotated, so that the rollers repeatedly roll the workpiece 1, thereby achieving the strengthening of the surface of the workpiece 1.

[0070] Further, the surface of the roller is provided with an embossed pattern.

[0071] The roller is replaced by a roller with an embossed pattern on the surface, the workpiece 1 is clamped, the rollers on the three clamping rods 200 abut against the outer side wall of the workpiece 1, and the workpiece 1 is slowly rotated, so that the rollers perform embossing work on the workpiece 1, thereby achieving the embossing of the workpiece 1 and improving the functionality and practicability of the device.

[0072] In some embodiments, referring to Figure 3 and Figure 5 , the supporting roller 323 is a cam tooth disc, and the supporting member 320 further comprises a tooth ring 324, the tooth ring 324 is used for sleeving on the eccentric workpiece 1, and the cam tooth disc is engaged with the tooth ring 324.

[0073] In this embodiment, the cam tooth disc is sleeved on the pin shaft 322, and the cam tooth disc rotates around the pin shaft 322.

[0074] When the eccentric workpiece 1 needs to be machined, according to the eccentricity of the workpiece 1, the outer profile of the cam tooth disc is calculated, the tooth ring 324 is always engaged with the three cam tooth discs during the rotation of the workpiece 1, the tooth ring 324 is sleeved on the workpiece 1, the positions of the three clamping rods 200 are adjusted so that the cam tooth discs on the clamping rods 200 are all engaged with the tooth ring 324, and then the eccentric clamping of the workpiece 1 is realized, and the applicability of the device is further improved.

[0075] In another aspect, the application provides a method for using the center frame clamping device, using the center frame clamping device, comprising the following steps:

[0076] First, the support 320 is installed on the extension shaft 310.

[0077] Then, the extension shaft 310 is installed on the clamping rod 200 one by one.

[0078] The positions of the three clamping rods 200 are adjusted respectively so that the supports 320 are all in abutment with the peripheral wall of the workpiece 1 and meet the requirement that the round runout tolerance of the workpiece 1 is within 0.05 mm.

[0079] For example, the outer diameter of the part is less than the large length-diameter ratio blind hole part of the original center frame clamping stroke.

[0080] First, the outer circle of the workpiece 1 is rough machined:

[0081] The outer circle of the workpiece 1 is rough machined by using the machine tool, and 1-2 mm semi-finishing and finishing allowance is left.

[0082] Then, the inner cavity of the workpiece 1 is rough machined:

[0083] One end of the workpiece 1 is clamped on the machine tool, the center frame body 100 is moved so that the workpiece 1 is located in the center frame body 100, the position of the clamping rod 200 is adjusted, the rolling bearing is installed on the sleeve 321 and assembled on the clamping rod 200, the position of the clamping rod 200 is adjusted again so that the three rolling bearings are all in abutment with the workpiece 1, at the same time, the dial indicator is adsorbed on the center frame body 100, the position of the clamping rod 200 is adjusted to ensure that the round runout of the workpiece 1 is within 0.05, the clamping of the workpiece 1 is completed, and the inner cavity of the workpiece 1 is machined by using the lengthened tool bar.

[0084] Then, the workpiece 1 is subjected to aging treatment.

[0085] The workpiece 1 is hung down from the machine tool for vibration aging and natural aging treatment, and after the aging is completed, the round runout is re-clamped and aligned to be within 0.05 mm. The vibration aging is that the workpiece 1 is vibrated by using a vibration testing machine to release the internal stress of the workpiece 1. The natural aging treatment is that the workpiece 1 is naturally placed for a set time to further release the internal stress of the workpiece 1.

[0086] Finally, semi-finishing, finishing treatment.

[0087] The workpiece 1 is clamped and aligned by the center frame clamping device; the inner cavity of the workpiece 1 is semi-finished and finished.

[0088] After the inner cavity is processed, the end face of the part is finished to the design size as a reference surface for re-alignment;

[0089] The center frame clamping device is removed, and the workpiece 1 is processed according to the normal clamping mode of the machine tool, that is, the "one clamping and one top" scheme, and the above process reference is used as the alignment reference. Among them, one top and one clamping are the conventional steps in the process of adding the bed, which will not be described in detail here.

[0090] Further, the workpiece 1 can also be subjected to rolling strengthening:

[0091] The rolling bearing in the sleeve 321 is removed and replaced with a roller.

[0092] For example, the roller adopts a solid roller with a surface hardness of HRC60-65.

[0093] The center frame body 100 is moved to the part of the workpiece 1 that needs to be strengthened.

[0094] Adjust the position of the clamping rod 200 so that the roller is in contact with the surface of the workpiece 1, and apply the rated pre-tightening force to the center frame through the torque wrench.

[0095] Finally, slowly rotate the workpiece 1; the surface of the workpiece 1 that needs to be embossed is repeatedly rolled by the roller. In this way, the device has multiple purposes and improves the applicability of the device.

[0096] Further, the workpiece 1 can also be subjected to surface local embossing treatment.

[0097] At this time, only the rolling bearing needs to be replaced with a roller with a specific pattern texture on the surface, and the embossing treatment of the workpiece 1 surface can be realized by following the above steps. Thus, the applicability of the device is further improved.

[0098] When the eccentric long shaft inner cavity workpiece 1 needs to be processed:

[0099] Replace the rolling bearing with a cam tooth disc that matches the workpiece 1, and simultaneously heat a tooth ring 324 on the outer circle of the workpiece 1. The tooth ring 324 is preheated and set on the tooth ring 324, so that the tooth ring 324 is fixed on the surface of the workpiece 1.

[0100] Among them, the outer contour of the cam tooth disc needs to be calculated in advance according to the eccentricity of the workpiece 1, so that the tooth ring 324 is always engaged with the three cam tooth discs during the rotation of the workpiece 1.

[0101] Then the center frame body 100 with the cam toothed disc is moved to the tooth ring 324 of the workpiece 1, the position of the clamping rod 200 is adjusted so that the three cam toothed discs are engaged with the tooth ring 324 to realize the eccentric clamping of the workpiece 1, and then subsequent operations can be carried out.

[0102] Through the cooperation of the cam toothed disc and the tooth ring 324, the eccentric clamping of the workpiece 1 is realized, and in the rotating process of the workpiece 1, the tooth ring 324 is driven to rotate eccentrically, and the tooth ring 324 always remains engaged with the three cam toothed discs to realize the clamping and support of the workpiece 1, improve the machining qualification rate of the eccentric workpiece 1, and there is no need for a specific design of a complex eccentric clamping device.

[0103] The use method of the center frame clamping device provided by the application is provided, the extension assembly 300 is installed on the three clamping rods 200 respectively to extend the clamping range of the clamping rod 200, the extension shaft 310 on the extension assembly 300 is located at the end of the clamping rod 200 close to the central axis, the support 320 is arranged on the extension shaft 310, and in the use process, the three supports 320 are respectively abutted with the workpiece 1 to realize the support of the workpiece 1. Through the arrangement of the extension shaft 310 and the support 320, the length of the clamping rod 200 is extended, the limitation of the relatively thick end of the clamping rod 200 on the size of the workpiece 1 is reduced, the clamping of the small-diameter workpiece 1 is facilitated, and through the replacement of the support 320, the eccentric workpiece 1 can be clamped and machined.

[0104] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0105] It should be understood that the application is not limited to the precise construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the appended claims.

Claims

1. A center frame clamping device, characterized in that, It includes a central frame body (100), three clamping rods (200) and three extension components (300); The clamping rods (200) are evenly distributed on the central frame body (100) and move toward the central axis of the central frame body (100) or away from it. The extension components (300) are correspondingly arranged on the clamping rods (200). The extension assembly (300) includes an extension shaft (310) and a support member (320). The extension shaft (310) is disposed at the end of the clamping rod (200) near the central axis of the central frame body (100). The support member (320) is disposed on the extension shaft (310) for supporting the workpiece (1). The support member (320) includes a sleeve (321), a pin (322), and a support roller (323). The sleeve (321) is disposed at the end of the extension shaft (310). The sleeve (321) has an installation groove. The pin (322) passes through the sleeve (321). The support roller (323) is installed in the installation groove and rotatably sleeved on the pin (322). The support roller (323) is used to abut against the workpiece (1). The pin (322) includes a limiting part (3221), a first connecting part (3222), a mounting part (3223), and a second connecting part (3224) connected in sequence. The diameters of the limiting part (3221), the first connecting part (3222), the mounting part (3223), and the second connecting part (3224) decrease in sequence. The support roller (323) is sleeved on the mounting part (3223) and abuts against the step between the first connecting part (3222) and the mounting part (3223). When the pin (322) passes through the sleeve (321), part of the first connecting part (3222), the mounting part (3223), and part of the second connecting part (3224) are located in the mounting groove. A retaining ring (325) is fitted on the second connecting part (3224). One side of the retaining ring (325) abuts against the side wall of the support roller (323), and the other side abuts against the side wall of the mounting groove, and cooperates with the step between the first connecting part (3222) and the mounting part (3223). The second connecting part (3224) has a through hole (3225), and a cotter pin is inserted into the through hole (3225). The length of the cotter pin is greater than the diameter of the second connecting part (3224).

2. The center frame clamping device according to claim 1, characterized in that, The support roller (323) is a rolling bearing, and the outer ring of the rolling bearing is used to abut against the workpiece (1).

3. The center frame clamping device according to claim 1, characterized in that, The support roller (323) is a rolling mill roller.

4. The center frame clamping device according to claim 3, characterized in that, The surface of the roll is decorated with embossed patterns.

5. The center frame clamping device according to claim 1, characterized in that, The support roller (323) is a cam toothed disc, and the support member (320) also includes a toothed ring (324), which is used to be sleeved on the eccentric workpiece (1), and the cam toothed disc meshes with the toothed ring (324).

6. A method of using a center frame clamping device, characterized in that, Using the center frame clamping device as described in any one of claims 1-5, the method comprises: First, install the support member (320) on the extension shaft (310); Then, the extension shafts (310) are installed one by one on the clamping rods (200); Adjust the positions of the three clamping rods (200) respectively so that the support (320) abuts against the peripheral wall of the workpiece (1) and the circular runout tolerance of the workpiece (1) is within 0.05mm.

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