Workpiece supporting and fixing device

Abstract

The utility model relates to the field of workpiece fixing devices, in particular to a workpiece supporting and fixing device which is used for being installed on a workbench of machining equipment and comprises a base, a fixing assembly is installed on the base, the workpiece supporting and fixing device comprises an expansion sleeve, the expansion sleeve comprises a ring body section and a sectioning section, and the sectioning section is provided with at least two sectioning parts. The ring body section is provided with a fixing structure fixedly connected with the base, the ring body section and the base are inserted and positioned through a positioning protrusion and a positioning concave part, the expansion sleeve is fixed to the base through the fixing piece, the expansion core is arranged in the expansion sleeve and matched with the sectioning sections through slopes, and the expansion core can drive the sectioning sections to elastically open when moving in the direction parallel to the axial direction of the expansion sleeve. The expansion core is arranged on the base to tightly support the workpiece sleeved on the expansion sleeve, the driving device is arranged on the base, is in transmission connection with the expansion core and is used for driving the expansion core to move, the workpiece tightly-supporting and fixing device can tightly support and fix the workpiece from the inside of the workpiece, and the expansion sleeve matched with the workpiece is positioned on the base, so that high-precision positioning and fixing of the workpiece on processing equipment can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to workpiece fixing device field, concretely relates to a workpiece bracing and fixing device. BACKGROUND

[0002] When workpiece is processed on the machining center, the workpiece needs to be positioned and fixed on the workbench of the machining center. The traditional method is to use a lever micrometer gauge to divide the machining center, and then use a pressing plate to press and fix the workpiece on the workbench of the machining center. Such a way is slow, low in efficiency, and can also produce a large error.

[0003] Especially when the outer wall of the cylindrical and annular workpiece is processed, it is difficult to position and fix the workpiece on the workbench of the machining center by cooperating with the outer wall of the workpiece, otherwise the fixing device can easily interfere with the machining tool. Therefore, it is necessary to design a fixing device to conveniently and accurately position and fix the cylindrical and annular workpiece on the workbench of the machining center. SUMMARY

[0004] The utility model provides a workpiece bracing and fixing device to conveniently and accurately position and fix the workpiece on the workbench of the machining equipment.

[0005] A workpiece bracing and fixing device is used for installing on the workbench of the machining equipment, comprising a base, a fixing assembly is installed on the base, and the fixing assembly comprises:

[0006] An expansion sleeve comprises a ring body segment and a split segment, the split segment has at least two slits, the slits divide the split segment into at least two split parts, the ring body segment has a fixing structure fixedly connected with the base, one of the base and the ring body segment comprises a positioning protrusion, and the other comprises a positioning recess, the positioning recess is used for inserting the positioning protrusion to realize positioning of the expansion sleeve on the base;

[0007] A fixing piece is used for fixing the expansion sleeve to the base;

[0008] An expansion core is arranged in the expansion sleeve, the expansion core and the split segment are matched through a slope, so that the expansion core can drive each split part to be elastically expanded when moving along an axial direction parallel to the expansion sleeve to brace the machined workpiece sleeved on the expansion sleeve;

[0009] A driving device is arranged on the base and is in transmission connection with the expansion core to drive the expansion core to move.

[0010] In one technical solution, the base has a mounting cavity accommodating the driving device, the mounting cavity has a top wall, the expansion sleeve is fixed on a side of the top wall facing away from the mounting cavity, the top wall has a through hole, and the driving device and the expansion sleeve are drivingly connected through the through hole; the positioning protrusion is a protruding ring integrally formed at a mouth of the through hole, an end of the inner cavity of the expansion sleeve facing the base constitutes the positioning recess, and the protruding ring is inserted into the expansion sleeve, or the positioning protrusion is a protruding ring integrally formed at an end of the inner cavity of the expansion sleeve facing the base, the through hole constitutes the positioning recess, and the protruding ring is inserted into the through hole.

[0011] In one technical solution, the fixing structure is a flange protruding radially on the ring segment, and the fixing structure is pressed against the base.

[0012] In one technical solution, the fixing member includes a supporting part and a cantilever part, the supporting part is used for supporting on the base, the cantilever part cantilevers towards the expansion sleeve relative to the supporting part, and the fixing member is in pressing fit with the flange through the cantilever part.

[0013] In one technical solution, at least two fixing members are arranged, the at least two fixing members are arranged at intervals in the circumferential direction of the expansion sleeve, and an end surface of the fixing member facing away from the base has a part located outside the contour of the split segment, and is used for supporting the workpiece being machined.

[0014] In one technical solution, the split includes a thin-walled segment and a thick-walled segment, the thin-walled segment is connected with the ring segment, the thick-walled segment is located on a side of the thin-walled segment facing away from the ring segment, and an outer wall surface of the thick-walled segment is biased outward relative to the thin-walled segment, and is used for cooperating with the workpiece being machined.

[0015] In one technical solution, the expansion sleeve is driven to open by moving towards the base, the driving device has an action end capable of reciprocating, one end of the expansion sleeve is threadedly connected to the action end, and the other end has a driving structure used for cooperating with a tool to drive the expansion sleeve to rotate and realize disassembly and assembly of the expansion sleeve on the action end.

[0016] In one technical solution, the position of the expansion sleeve when the split is not elastically deformed is defined as an initial position, and the expansion sleeve is at an end position at the end of the movement stroke, when the expansion sleeve is at the initial position, an end of the expansion sleeve provided with the driving structure protrudes out of the expansion sleeve.

[0017] In one technical solution, at least two sets of the fixing assembly are arranged on the base.

[0018] In one technical solution, the driving device is a driving cylinder.

[0019] The workpiece straining and fixing device has the advantages that:

[0020] In use, the workpiece straining and fixing device is installed on the workbench of the machining equipment through the base. The expansion sleeve is positioned and installed on the base through the positioning protrusions, so that the expansion sleeve has an accurate installation position on the workbench of the machining equipment. When machining the workpiece, the workpiece is sleeved on the expansion sleeve, and the driving device drives the expansion core to act to open the segments of the expansion sleeve, so as to internally strain the machined workpiece, and realize convenient and accurate positioning and fixed installation of the machined workpiece on the workbench of the machining equipment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a structural schematic view of an embodiment of the workpiece straining and fixing device of the utility model;

[0022] Figure 2 FIG. 2 is a structural schematic view of the expansion sleeve in the embodiment of the workpiece straining and fixing device of the utility model;

[0023] Figure 3 FIG. 3 is a structural schematic view of another view of the expansion sleeve in the embodiment of the workpiece straining and fixing device of the utility model;

[0024] Figure 4 FIG. 4 is a structural schematic view of the expansion core in the embodiment of the workpiece straining and fixing device of the utility model;

[0025] Figure 5 FIG. 5 is a structural schematic view of the driving device in the embodiment of the workpiece straining and fixing device of the utility model;

[0026] Figure 6 FIG. 6 is a structural schematic view of the base in the embodiment of the workpiece straining and fixing device of the utility model;

[0027] Figure 7 FIG. 7 is a structural schematic view of the fixing member in the embodiment of the workpiece straining and fixing device of the utility model;

[0028] Figure 8 FIG. 8 is a top view of the embodiment of the workpiece straining and fixing device of the utility model.

[0029] List of feature names corresponding to the reference numerals in the drawings:

[0030] 1, base; 11, bottom plate; 12, side plate; 13, top plate; 14, mounting seat; 15, mounting cavity; 16, protruding ring;

[0031] 2, fixing assembly;

[0032] 21, sleeve; 211, ring segment; 212, slit; 213, split; 2131, thin wall segment; 2132, thick wall segment; 214, flange; 215, tapered slope;

[0033] 22, core; 221, connecting segment; 222, working segment; 223, linear slot;

[0034] 23, fixing member; 231, support portion; 232, overhanging portion; 233, fixing hole; 234, outflow passage;

[0035] 24, driving device; 241, threaded hole. DETAILED DESCRIPTION

[0036] The application will be described in further detail below with reference to the drawings. Like elements in different embodiments are denoted by like reference numerals. In the following embodiments, many details are described in order to provide a more thorough description of the application. However, it will be apparent to those skilled in the art that some features can be omitted, or replaced by other elements, materials, methods, in different situations. In some cases, some operations related to the application are not shown or described in the specification, in order to avoid the core of the application being overwhelmed by too much description, and it is not necessary to describe these operations in detail for those skilled in the art, who can fully understand the operations according to the description in the specification and general technical knowledge in the art.

[0037] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments, and the operation steps involved in each embodiment can also be sequentially adjusted or modified in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only intended to clearly describe one embodiment, and do not mean that the composition and / or order is necessary.

[0038] In this document, the serial numbers of components, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequential or technical meaning. The "connection" and "coupling" mentioned in the application include direct and indirect connections (couplings) unless otherwise specified.

[0039] The expansion core of the workpiece bracing and fixing device can move along the axial direction of the expansion sleeve under the driving of the driving device, and since the expansion core and the expansion sleeve are matched through the inclined surface, the elastic opening of each split part of the expansion sleeve can be driven through the movement of the expansion core, the workpiece can be braced from the inside of the workpiece to be processed through the expansion of the expansion sleeve, the fixing of the workpiece to be processed on the workpiece bracing and fixing device is realized, and the workpiece bracing and fixing device is fixed on the workbench of the machining equipment through the base, the positioning of the expansion sleeve on the base is realized through the cooperation of the positioning convex and the positioning concave between the expansion sleeve and the base, and therefore, the accurate positioning and installation of the workpiece to be processed on the workbench of the machining equipment can be realized.

[0040] Embodiments of the workpiece bracing and fixing device in the utility model:

[0041] In some embodiments, please refer to Figure 1 , the workpiece bracing and fixing device comprises a base 1 and a fixing assembly 2 installed on the base 1. The fixing assembly 2 comprises an expansion sleeve 21, an expansion core 22, a fixing piece 23 and a driving device 24. In use, the base 1 is used for fixing installation on the workbench of the machining equipment to realize the fixed installation of the workpiece bracing and fixing device on the machining equipment.

[0042] The structure of the expansion sleeve 21 please refer to Figure 2 , the expansion sleeve 21 comprises a ring body section 211 and a split section along the axial direction thereof, the split section has a slit 212, and the slit 212 penetrates the wall of the expansion sleeve 21, and the split section is divided into a plurality of split parts 213. In some embodiments, the split section has four slits 212, and the four slits 212 divide the split section into four split parts 213, and the four split parts 213 are distributed in the circumferential direction of the ring body section 211. In other embodiments, the number of slits can be increased or decreased as appropriate, but cannot be less than two, that is, the split section is at least divided into two parts, and the number of slits can be more than four, such as five, in which case the split section is divided into five split parts. Please refer to Figure 3 , the end of the inner cavity of the expansion sleeve 21 away from the ring body section 211 is an expanded port structure, that is, the cavity wall at this end is a tapered inclined surface 215.

[0043] Regarding the structure of the split part 213, in some embodiments, please refer to Figure 2 , the split part 213 comprises a thin wall section 2131 and a thick wall section 2132, and the split part 213 is connected to the ring body section 211 through the thin wall section 2131, and the connection here represents a connection relationship, and the two are actually integrally formed. The thick wall section 2132 is located on the side of the thin wall section 2131 away from the ring body section 211, and the outer wall surface of the thick wall section 2132 is outwardly offset relative to the thin wall section 2131, so that the expansion sleeve 21 can be matched with the workpiece to be processed through the thick wall section 2132, and the thin wall section 2131 is relatively thin, facilitating the elastic deformation of the split part 213.

[0044] The ring segment 211 is a whole ring structure, and has a flange 214 protruding radially outwardly from the inflation sleeve 21. The flange 214 constitutes a fixing structure for fixing the inflation sleeve 21 to the base 1. During assembly, the inflation sleeve 21 is fixedly connected to the base 1 through the fixing structure.

[0045] The inflation core 22 is shown in FIG. 2B. During assembly, the inflation core 22 is inserted into the inner cavity of the inflation sleeve 21. Figure 4 The inflation core 22 includes a connecting segment 221 and a working segment 222. The connecting segment 221 is connected to the driving device 24 at an end thereof distal to the working segment 222. The working segment 222 is a frustum structure, and has a tapered surface on the outer periphery. The inflation core 22 is cooperated with the split segments of the inflation sleeve 21 through the working segment 222. The inflation core 22 is capable of reciprocating along a direction parallel to the axis of the inflation sleeve 21 under the driving of the driving device 24. When the driving device 24 drives the inflation core 22 to move towards the position of the base 1, the inflation core 22 is capable of driving the elastic deformation and opening of the split segments 213 through the cooperation of the tapered surface therebetween, and thereby clamping the workpiece on the outside of the inflation sleeve 21. After clamping, the driving device 24 is locked to keep the position of the inflation core 22. At this time, the inflation core 22 is at the end of the movement stroke, i.e., the working position, thereby achieving the installation of the workpiece on the workpiece clamping and positioning device, and achieving the precise installation. After the workpiece is processed, the driving device 24 drives the inflation core 22 to move away from the base 1, and the split segments 213 are restored to the original state, and the inflation core 22 returns to the initial position.

[0046] In other embodiments, the working segment of the inflation core can also be a disc with a diameter larger than that of the connecting segment. In this case, only the inflation sleeve has a tapered surface, and the inflation core is cooperated with the inflation sleeve through the disc-shaped working segment to drive the inflation sleeve to expand. Of course, the inflation core 22 can also have the structure shown in FIG. 2C, and the inflation sleeve does not have a tapered surface. In this case, the working segment 222 of the inflation core 22 is located outside the inflation sleeve at the initial position, and the working segment 222 is cooperated with the opening of the inner cavity of the inflation sleeve during the movement of the inflation core 22 towards the working position under the driving of the driving device 24, thereby driving the inflation sleeve to expand. Of course, the working segment of the inflation core can also be a prism, and the inner wall surface of the split segment of the inflation sleeve is adapted thereto. In this case, the inflation sleeve is cooperated with the inflation core through the flat tapered surface. Of course, the inflation sleeve can also have an inclined surface inside the inflation sleeve, which is inclined towards the center of the inflation sleeve away from the base. In this case, the inflation core drives the split segments to expand by pushing the split segments away from the base. Figure 4

[0047] ​To facilitate the installation and replacement of the expanding core 22, the expanding core 22 is threadedly connected with the action end of the driving device 24, and the working section 222 has a slot 223 at the end away from the connecting section 221, which is used as a driving structure and can be matched with a slot screwdriver to drive the expanding core 22 to rotate and realize the disassembly and assembly of the expanding core 22 on the action end of the driving device 24. To facilitate the operation, in some embodiments, when the expanding core 22 is in the initial position, one end of the driving structure extends out of the sleeve 21. In other embodiments, the driving structure can also be a cross-shaped slot to be matched with a cross-shaped screwdriver. Of course, the driving structure can also be an inner hexagonal slot or an outer hexagonal head to be matched with an appropriate tool.

[0048] The structure of the driving device 24 is shown in Figure 5 In some embodiments, the driving device 24 is a pneumatic cylinder, and the end of the piston extending out of the cylinder body has a threaded connection hole 241 for threadedly connecting the expanding core 22. In other embodiments, the driving device can also be a hydraulic cylinder, an electric push rod, etc.

[0049] To realize the accurate positioning and fixing of the workpiece to be processed on the workbench of the machining equipment, it is necessary to first ensure the accurate and reliable positioning of the sleeve 21 on the base 1. For this purpose, one of the ring body section 211 and the base 1 includes a positioning protrusion, and the other includes a positioning recess, which is used for inserting the positioning protrusion to realize the positioning of the sleeve 21 on the base 1. In this way, the accurate positioning of the workpiece to be processed on the workbench of the machining equipment is realized, and the positioning accuracy can reach more than 0.01 mm. In one embodiment, please refer to Figure 6 The base 1 includes a bottom plate 11, two side plates 12, a top plate 13, and a mounting seat 14 fixed on the top plate 13.

[0050] The two side plates 12 are spaced apart and mounted on the bottom plate 11, and the two ends of the top plate 13 are connected with the ends of the two side plates 12 away from the bottom plate 11. In this way, the bottom plate 11, the side plates 12, and the top plate 13 enclose a mounting cavity 15 for accommodating the driving device 24. The mounting seat 14 is fixed on the top plate 13 to form a top wall of the mounting cavity 15, and the sleeve 21 is mounted on the side of the mounting seat 14 away from the mounting cavity 15. The top wall has a through hole penetrating through the top plate 13 and the mounting seat 14, and the mounting seat 14 is integrally formed with a protruding ring 16 at the hole along the end of the through hole away from the mounting cavity 15. The protruding ring 16 constitutes a positioning protrusion, which is inserted into the end of the inner cavity of the sleeve 21 facing the base 1 during assembly. That is, the end of the inner cavity of the sleeve 21 facing the base 1 constitutes a positioning recess. The driving device 24 is drivingly connected with the expanding core 22 through the through hole. In other embodiments, the top plate 13 and the mounting seat 14 can be integrally formed, and of course, the mounting seat 14 can not be provided, in which case the top plate 13 directly constitutes the top wall.

[0051] In some other embodiments, the positioning protrusion can also be a protruding ring integrally formed on the inner cavity of the expansion sleeve towards the cavity opening at one end of the base 1, and the protruding ring is inserted into the through hole, naturally, the through hole constitutes the positioning recess. Of course, a positioning pin can also be integrally formed on the end surface of the expansion sleeve towards the base as the positioning protrusion, and a positioning slot is arranged on the surface of the base matched with the expansion sleeve as the positioning recess, and the positioning pin is inserted into the positioning slot to realize the positioning of the expansion sleeve on the base. Of course, the positioning protrusion and the positioning recess can also be arranged on the end surface of the expansion sleeve towards the base at the same time, and the positioning recess and the positioning protrusion are arranged on the surface of the base matched with the expansion sleeve, and the positioning protrusion and the positioning recess are inserted to realize the positioning of the expansion sleeve on the base.

[0052] The structure of the fixing member 23 is shown in Figure 1 and Figure 7 The fixing member 23 is fixed on the base 1 by screws, and the flange 214 is pressed on the base 1 to realize the fixed connection of the expansion sleeve 21 on the base 1. In some embodiments, the fixing member includes a support part 231 for supporting on the base 1 and a cantilever part 232 cantilevered towards the expansion sleeve 21 relative to the support part 231, and the fixing member is in pressing fit with the flange 214 through the cantilever part 232. The part of the cantilever part 232 close to the support part 231 is provided with a fixing hole 233, and the fixing member can be fixed on the base 1 by inserting a screw into the fixing hole 233. In other embodiments, an expansion sleeve fixing hole can also be formed on the flange 214, and the expansion sleeve is fixed on the base by screwing a screw into the expansion sleeve fixing hole and connecting with the base in threads, in which case the screw in the expansion sleeve fixing hole constitutes the fixing member. Regarding the fixing mode of the expansion sleeve on the base, in other embodiments, the fixing structure can also be a groove arranged on the ring body segment, and the fixing member is a fixing plate fixed on the base and inserted into the groove of the expansion sleeve to realize the fixing of the expansion sleeve on the base.

[0053] In some embodiments, please refer to Figure 1 and Figure 8 The fixing member has multiple, specifically three, which are arranged at intervals in the circumferential direction of the expansion sleeve 21, and the end surface of the fixing member away from the base 1 has a part outside the contour of the split segment in the axial projection of the expansion sleeve 21, which is used for supporting the processed workpiece, and the gap between the adjacent two fixing members constitutes an outflow channel 234 for the cooling liquid flowing into the processed workpiece to flow out. In actual work, when the upper end of the processed workpiece is processed, the cooling liquid will flow into the processed workpiece, and the outflow channel 234 can be used for the cooling liquid to flow out. Of course, the workpiece clamping and fixing device in the utility model can also be used to fix the processed workpiece for boring processing, and the cooling liquid flowing into the processed workpiece during boring processing can flow out through the outflow channel 234.

[0054] Please refer to Figure 1The four sets of fixing assemblies 2 are installed on the base 1 of the workpiece clamping and fixing device, so that four workpieces to be machined can be clamped at the same time, and the working efficiency is improved; the number of the fixing assemblies on the base in other embodiments can be less than four sets, such as three sets, two sets or one set, or can be more than four sets, such as five sets or more than five sets, which is set according to specific needs, so as to further improve the machining efficiency.

[0055] The above application of specific examples is used to illustrate the utility model, which is only used to help understand the utility model, and does not limit the utility model. For the skilled person in the technical field to which the utility model belongs, according to the idea of the utility model, a number of simple deductions, deformations or substitutions can be made.

Claims

1. A workpiece clamping fixture for mounting on a table of a machining apparatus, characterized by, The base is provided with a fixing assembly, the fixing assembly comprises: The sleeve comprises a ring segment and a split segment, the split segment has at least two slits, the slits divide the split segment into at least two split parts, the ring segment has a fixing structure fixedly connected with the base, the ring segment and the base have a positioning protrusion and a positioning recess respectively, the positioning recess is used for inserting the positioning protrusion to position the sleeve on the base; A fixing member is used for fixing the sleeve on the base; A core is arranged in the sleeve, the core and the split segment are matched through a slope, so that the core can drive each split part to be elastically expanded when the core moves along the axial direction of the sleeve to tightly clamp a workpiece to be processed on the sleeve; A driving device is arranged on the base and is in transmission connection with the core to drive the core to move.

2. The workpiece holding fixture of claim 1, wherein The base has a mounting cavity for accommodating the driving device, the mounting cavity has a top wall, the sleeve is fixed on a side of the top wall away from the mounting cavity, the top wall has a through hole, the driving device and the core are in transmission connection through the through hole; the positioning protrusion is a protruding ring integrally formed at a mouth of the through hole, an end of an inner cavity of the sleeve towards the base forms the positioning recess, the protruding ring is inserted into the inner cavity of the sleeve, or the positioning protrusion is a protruding ring integrally formed at an end of an inner cavity of the sleeve towards the base, the through hole forms the positioning recess, and the protruding ring is inserted into the through hole.

3. The workpiece holding fixture of claim 1 or 2, wherein The fixing structure is a flange protruding radially on the ring segment, and the fixing member is used for pressing the flange against the base.

4. The workpiece holding fixture of claim 3, wherein The fixing member comprises a supporting part and a cantilever part, the supporting part is used for supporting the base, the cantilever part cantilevers towards the sleeve relative to the supporting part, and the fixing member is in pressing connection with the flange through the cantilever part.

5. The workpiece holding fixture of claim 3, wherein The fixing member is provided with at least two fixing members, the at least two fixing members are arranged at intervals in the circumferential direction of the sleeve, and an end surface of the fixing member away from the base has a part outside the contour of the split segment to support the workpiece to be processed.

6. The workpiece holding fixture of claim 1 or 2, wherein The split part comprises a thin-walled segment and a thick-walled segment, the thin-walled segment is connected with the ring segment, the thick-walled segment is located on a side of the thin-walled segment away from the ring segment, and an outer wall surface of the thick-walled segment is outwardly offset relative to the thin-walled segment to be matched with the workpiece to be processed.

7. The workpiece holding fixture of claim 1 or 2, wherein The core drives the split part to be expanded when the core moves towards the base, the driving device has an action end capable of reciprocating, one end of the core is threadedly connected with the action end, and the other end has a driving structure used for cooperating with a tool to drive the core to rotate and realize disassembly and assembly of the core on the action end.

8. The workpiece holding fixture of claim 7, wherein, An initial position of the core is defined as a position of the core when the split part is not elastically deformed, and an end position of the core is defined as a position of the core at the end of a movement stroke of the core, when the core is at the initial position, an end of the core provided with the driving structure protrudes out of the sleeve.

9. The workpiece holding fixture of claim 1 or 2, wherein The base is provided with at least two sets of the fixing assembly.

10. The workpiece holding fixture of claim 1 or 2, wherein The driving device is a driving cylinder. The driving device is a driving cylinder.

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