Self-centering anti-interference flange type clamping machining device

Abstract

The invention discloses a self-centering anti-interference flange type clamping machining device, relates to the technical field of clamping devices for machining, and solves the problem that interference exists in machining of a radial positioning surface by a positioning element after radial positioning in the prior art. The device comprises a clamp body, an axial positioning assembly is fixedly arranged at the front end of the clamp body, a centering assembly capable of moving in the axial direction and the radial direction is arranged on the clamp body, and the positioning face of the axial positioning assembly and the positioning end of the centering assembly are used for conducting axial positioning and centering positioning on a workpiece respectively. The centering assembly is connected with the axial pushing mechanism, and the axial pushing mechanism is used for driving the centering assembly to slide in the axial direction, so that the positioning end of the centering assembly stretches out or retracts relative to the positioning face of the axial positioning assembly in the axial direction. A radial opening mechanism is arranged on the clamp body and used for driving the centering assembly to be radially expanded or folded. On the basis of flange clamping, the centering assembly and the axial pushing mechanism are additionally arranged, the self-centering function of the clamp and the anti-interference function of a positioning element are achieved, and the production efficiency of products is improved.

Description

Technical Field

[0001] The invention relates to the technical field of clamping devices for mechanical processing, in particular to a self-centering anti-interference flange type clamping mechanical processing device. Background Art

[0002] Flange clamping is one of the commonly used clamping methods in mechanical processing. Fix the special flange fixture with holes on the lathe spindle chuck or machine tool workbench. Under the condition of ensuring the position accuracy of the fixture end face and positioning elements, align the workpiece reference, connect and tighten the workpiece to be processed with the flange fixture with bolts, and process the product's aperture, end face, and outer circle waiting for processing.

[0003] This type of clamping method is mainly used in the production and processing of parts with thin wall thickness, poor rigidity, high roundness of inner hole and outer circle, coaxiality and high parallelism of both end faces. Such as silicon carbide wafer thinning grinding wheel matrix, single crystal silicon rough grinding wheel matrix, tool peripheral grinding wheel matrix, etc., as well as boxes, various flanges, hydraulic cylinders, sleeves and other parts in mechanical equipment. The common problem of this type of parts is that the radial wall thickness is thin, the ratio of diameter to wall thickness is large, radial deformation is easy to occur, the size is out of tolerance, and the clamping cannot be radially stressed. The flange clamping is tightened by bolt connection to realize the clamping and fixing of the workpiece under axial force, avoiding the deformation of the workpiece caused by radial force of general clamping such as three-jaw and four-jaw chucks, and ensuring the product processing technical requirements.

[0004] At present, there are two types of flange clamping: with radial positioning and without radial positioning. The clamping form with radial positioning usually requires that the workpiece has a radial positioning reference, and the flange fixture is designed with a positioning step, which is used to perform radial positioning to ensure that the position of the workpiece in the machine tool is determined. This type of clamping form avoids alignment time and has high clamping efficiency. However, due to the influence of the positioning step, it is impossible to achieve one-time clamping processing of the positioning surface and other processing parts, which requires adding processes and re-making tooling, affecting processing efficiency. In addition, the positioning reference must be fine-machined before processing to ensure dimensional accuracy to meet positioning requirements. For parts without dimensional accuracy requirements, in order to meet positioning requirements, a specially designed positioning reference is required, which increases processing difficulty, reduces processing efficiency, and increases production costs.

[0005] In the clamping form without radial positioning, the clamping flange has no radial positioning step, and the workpiece is directly connected to the fixture thread. Before clamping, the reference needs to be aligned by drawing a needle or calibrating a dial indicator to make the radial runout meet the process requirements. Since there is no radial positioning, alignment is required for each installation, the processing auxiliary time is long, and the processing efficiency is low. However, the positioning reference accuracy requirements are low, and there is no need to increase the positioning reference processing procedures and excessive dimensional processing accuracy, which reduces the processing difficulty. In addition, the aperture, outer circle, and end face can be clamped once except for the positioning end face, reducing the number of product production processes and auxiliary tooling design.

[0006] The two types of flange clamping methods currently used, one increases the difficulty of processing and the number of processing steps, and the other increases the auxiliary time for alignment, both of which prolong the entire production process time and increase the manufacturing cost. The fundamental reason for the defects of the two clamping methods is that the radial position cannot be determined without radial positioning, and the positioning element with radial positioning interferes with the subsequent processing of the workpiece positioning reference part. Therefore, both clamping methods have defects, affecting production efficiency. Summary of the invention

[0007] In view of the shortcomings of the above-mentioned background technology, the present invention proposes a self-centering anti-interference flange clamping machining device, which solves the problem that the clamping device in the prior art cannot achieve radial positioning and axial positioning at the same time. It also solves the problem that the positioning element in the prior art interferes with the machining of the radial positioning surface after achieving radial positioning.

[0008] The technical solution of the present invention is achieved as follows: a self-centering anti-interference flange clamping machining device comprises a clamping body, an axial positioning assembly is fixedly provided at the front end of the clamping body, a centering assembly capable of moving axially and radially is provided on the clamping body, the positioning surface of the axial positioning assembly and the positioning end of the centering assembly are respectively used for axial positioning and centering positioning of the workpiece; the centering assembly is connected to an axial pushing mechanism, the axial pushing mechanism is used to drive the centering assembly to slide axially, so that the positioning end of the centering assembly extends or retracts in the axial direction relative to the positioning surface of the axial positioning assembly; a radial expansion mechanism is provided on the clamping body, the radial expansion mechanism is used to drive the centering assembly to expand or close radially.

[0009] Preferably, the centering assembly includes a plurality of slide grooves Ⅰ circumferentially opened on the clamp body, the slide grooves Ⅰ are arranged along the axial direction of the clamp body, a pushing slider is slidably provided on the slide grooves Ⅰ, the pushing slider cooperates with the axial pushing mechanism, and a clamp seat portion is provided on the pushing slider; a positioning column is provided on the clamp seat portion, the axis of the positioning column is parallel to the sliding direction of the pushing slider, and can slide radially along the clamp body on the clamp seat portion.

[0010] Preferably, the axial pushing mechanism includes an axial pushing sleeve rotatably arranged on the outside of the clamping body, a pushing guide column is fixedly provided on the pushing slider, and the axial pushing sleeve is provided with a plurality of oblique grooves respectively cooperating with the pushing guide columns; when the axial pushing sleeve rotates, the pushing slider can be slid by utilizing the cooperation between the oblique grooves and the pushing guide columns, thereby driving the end of the positioning column to axially pass through or retract the positioning surface of the axial positioning component.

[0011] Preferably, the axial push sleeve is connected to an axial push sleeve handle, the axial push sleeve handle is provided with a positioning sleeve, and the axial push sleeve handle is provided with a spring that cooperates with the positioning sleeve.

[0012] Preferably, the radial expansion mechanism comprises a radial push disk rotatably arranged on the outside of the clamp body, the radial push disk is circumferentially provided with a plurality of spiral grooves, and the positioning columns are respectively correspondingly inserted into the spiral grooves; the radial push disk is connected to a radial push disk handle.

[0013] Preferably, the axial positioning assembly comprises a fixture carrier plate fixedly connected to the fixture body, an axial positioning ring is connected to the fixture carrier plate, and an outer side wall of the axial positioning ring is an axial positioning surface.

[0014] Preferably, the fixture carrier plate is provided with a slide groove II, which is arranged along the radial direction of the fixture carrier plate, and a radial slider is slidably provided on the slide groove II, and the radial slider is provided with a through hole to meet the requirements of the positioning column, and protective blocks are provided on both sides of the radial slider.

[0015] Preferably, the clamp body is externally connected to a clamp protection cover, and the clamp protection cover is respectively provided with long grooves that satisfy the actions of the axial pushing mechanism and the radial stretching mechanism, and the long grooves are slidably provided with arc-shaped protective covers for cooperating with the axial pushing mechanism or the radial stretching mechanism respectively, and the arc-shaped protective covers are provided with long waist holes, and bolts connected to the clamp protection cover are passed through the long waist holes to realize sliding guidance; a round hole is provided at the end of the long groove.

[0016] Preferably, the clamp body includes a coaxially arranged transition flange, a positioning flange, and a clamp base, the clamp base is provided with a shoulder for cooperating with an axial pushing mechanism, and the transition flange is provided with a tapered hole or a plane or a clamping step for cooperating with a machine tool.

[0017] Preferably, the fixture protective outer cover and the axial positioning assembly are provided with connection holes for connecting the workpieces by bolts.

[0018] Beneficial effects of the present invention: By setting up a clamping body, an installation and connection support foundation is provided for the entire device; the axial positioning assembly can realize axial positioning of the workpiece during clamping; the axial pushing mechanism cooperates with the centering assembly to push the centering assembly out of the positioning surface of the axial positioning assembly during the centering process, and cooperates with the radial expansion mechanism to expand the centering assembly to realize the centering operation in cooperation with the workpiece. After the centering is completed and the workpiece is tightened, it can be retreated to the inside of the positioning surface of the axial positioning assembly, eliminating the processing interference with the positioning surface of the workpiece.

[0019] The present invention innovatively adds a centering component and an axial push mechanism on the basis of flange clamping, combines the advantages of the two existing clamping methods, realizes the self-centering function of the clamp and the anti-interference function of the positioning element, and effectively improves the production efficiency of the product. Specifically, it is reflected in: 1. Less auxiliary production time: The self-centering function of this device realizes the self-centering of the fixture. Compared with the flange fixture without radial positioning, it reduces the workpiece correction time and improves production efficiency.

[0020] 2. Fewer production processes: The centering component of this device realizes the retraction anti-interference function under the drive of the axial pushing mechanism, eliminating the processing interference of the positioning element on the positioning surface. Compared with the fixture with radial positioning, it needs to increase the process of positioning surface processing, which reduces the production process and improves production efficiency.

[0021] 3. High positioning accuracy: The centering component of the device pushes the positioning column 33 to move synchronously in the radial direction in the spiral groove of the radial expansion mechanism to achieve variable positioning size. Compared with the traditional positioning step hole-shaft matching positioning, it reduces the decrease in positioning accuracy caused by changes in the positioning reference size of the workpiece and improves the positioning accuracy.

[0022] 4. Applicable to a wide variety of products: This device has a wide positioning range and flexible adjustment, and can meet the clamping needs of similar products of multiple specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front view structural schematic diagram of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the AA section; Figure 4 For the present invention Figure 2 Schematic diagram of the middle CC section; Figure 5 This is a schematic diagram of the structure of the axial pushing mechanism of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the D-direction structure; Figure 7 This is a schematic diagram of the structure of the centering component of the present invention; Figure 8 This is a schematic diagram of the structure of the axial pushing mechanism of the present invention; In the figure: 1: clamp body; 11: transition flange, 12: positioning flange, 13: fixture base; 131: shaft shoulder; 2: Axial positioning assembly; 21: fixture carrier plate, 22: axial positioning ring; 3. Centering components; 31: push slider, 32: clamping seat, 33: positioning column; 4: Axial driving mechanism; 41: axial push sleeve, 42: push guide post, 43: inclined groove, 44: axial push sleeve handle, 45: positioning sleeve, 46: spring; 5: Radial expansion mechanism; 51: radial push disk, 52: spiral groove, 53: radial push disk handle, 54: radial slider, 55: protective block; 6: Clamp protection cover; 61: arc-shaped protective cover, 62: long waist hole, 63: bolt, 64: long groove, 65: round hole; 7: Workpiece. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figure 1 , 2 As shown in Figures 3 and 4, Embodiment 1 is a self-centering anti-interference flange clamping machining device, comprising a clamp body 1, which provides a mounting and connection support foundation for the entire device. An axial positioning component 2 is fixedly provided at the front end of the clamp body 1, and the axial positioning component 2 can realize axial positioning of the workpiece 7 during the clamping process. A centering component 3 that can move in the axial and radial directions is provided on the clamp body 1, and the positioning surface of the axial positioning component 2 and the positioning end of the centering component 3 are respectively used for axial positioning and centering positioning of the workpiece 7.

[0027] The centering component 3 is connected to the axial pushing mechanism 4, and the axial pushing mechanism 4 is used to drive the centering component 3 to slide axially, so that the positioning end of the centering component 3 extends or retracts relative to the positioning surface of the axial positioning component 2 in the axial direction. The clamp body 1 is provided with a radial expansion mechanism 5, and the radial expansion mechanism 5 is used to drive the centering component 3 to expand or retract radially. In this embodiment, the axial pushing mechanism cooperates with the centering component to achieve the centering component being pushed out of the positioning surface of the axial positioning component during the centering process, and the centering component is expanded in cooperation with the radial expansion mechanism to achieve centering and centering operations in cooperation with the workpiece. After the centering is completed and the workpiece is tightened, it can be retracted to the inner side of the positioning surface of the axial positioning component to avoid processing interference with the workpiece.

[0028] As a further specific implementation, the clamp body 1 includes a coaxially arranged transition flange 11, a positioning flange 12, and a clamp base 13. Specifically in this embodiment, the parallelism of the two ends of the transition flange 11 is preferably less than 0.003 mm. Among them, the positioning flange is used for connection and positioning between the clamp base 13 and the transition flange 11, and is bolted and connected to the transition flange 11, and the hole and shaft match to ensure positioning accuracy. The positioning flange 12 is bolted to the clamp base 13, and the hole and shaft match.

[0029] The transition flange 11 is taper-matched with the machine tool spindle or aligned with the machine tool chuck to ensure that the axis of the transition flange 11 is coaxial with the machine tool rotation axis. The transition flange 11 and the positioning flange 12 are hole-shaft matched to ensure the centering accuracy. Similarly, the positioning flange 12 and the fixture base 13 are hole-shaft matched, and the matching clearance is preferably less than 0.01mm to ensure the radial positioning of the fixture.

[0030] As a further optional solution, the transition flange 11 is used for connection with a machine tool, and a tapered hole or a plane or a clamping step for matching and connecting with the machine tool is provided on the transition flange 11.

[0031] Specifically, when used in machine tools such as boring machines and milling machines, the transition flange 11 is used to connect to the machine tool worktable. One end of the transition flange 11 is designed to be a plane, and the other end is designed to be a positioning step hole that matches the hole axis of the positioning flange 6. The hole axis between the transition flange 11 and the positioning flange 6 matches, and the matching clearance is less than 0.01mm. It is tightened by a pressure plate or directly tightened by bolts, and it is ensured that the end face of the transition flange 11 is parallel or perpendicular to the machine tool worktable.

[0032] When used in a lathe, it can be connected to the machine tool spindle or clamped with a chuck. When connected to the lathe spindle, a tapered hole is opened at the axis of the transition flange, and the transition flange 11 matches the Morse taper of the spindle to ensure positioning accuracy, and is connected and pressed with the machine tool spindle flange with bolts. One end of the transition flange 11 is designed with a tapered hole and a bolt mounting hole corresponding to the spindle taper, and the other end is designed with a positioning step hole that matches the hole axis of the positioning flange 6. The clearance between the hole axis of the transition flange 11 and the positioning flange 6 is less than 0.01mm, and the coaxiality of the tapered hole and the positioning step hole is preferably less than 0.003mm.

[0033] When clamped by a chuck, one end of the transition flange 11 is designed with a clamping step and the other end is a plane. After the transition flange 11 is clamped by the chuck, the end face needs to be turned or aligned online to ensure the end face runout of the transition flange 11 and the radial runout of the positioning step.

[0034] Embodiment 2, on the basis of embodiment 1, as Figure 3 , 4As shown in Figures 7 and 8, the centering assembly 3 includes a plurality of slide grooves I circumferentially arranged on the fixture base 13 of the clamp body 1. The slide grooves I are arranged along the axial direction of the clamp body 1. A push slider 31 is slidably arranged on the slide grooves I. The push slider 31 cooperates with the axial push mechanism 4. A clamp seat 32 is arranged on the push slider 31. A positioning column 33 is arranged on the clamp seat 32. The positioning column 33 is a cylinder with a surface roughness preferably less than Ra1.6. The axis of the positioning column 33 is parallel to the sliding direction of the push slider 31 and can slide radially on the clamp seat 32 along the clamp body 1.

[0035] In this embodiment, the pushing slider 31 and the clamp seat 32 are arranged in an L shape, the groove type of the slide groove I is T-shaped, the center line of the slide groove I is parallel to the axis of the clamp base 13 and is located on the axial symmetry plane, the bottom width and height of the slide groove I are larger than the corresponding dimensions of the pushing slider 31 installed therewith, and the matching clearance is preferably 0.1mm~0.15mm to achieve a sliding connection, and the pushing slider can slide in the slide groove under the drive of the axial pushing mechanism.

[0036] A U-shaped slide groove is provided on the clamping seat 32, and the notch of the slide groove is arranged radially. A groove is designed on the outer wall of one end of the positioning column 33, and the end face width of the groove is slightly larger than the end wall thickness of the U-shaped groove of the push slider, and the matching clearance is preferably 0.1mm~0.18mm. The groove width of the groove bottom is slightly smaller than the width of the U-shaped groove, and the matching clearance is preferably 0.1mm~0.15mm. The groove of the positioning column cooperates with the U-shaped slide groove of the push slider to form a sliding connection, so that it can slide outward or slide closed under the drive of the radial expansion mechanism 5. In this way, the positioning column 33 can achieve radial movement while achieving axial movement, avoiding interference between the positioning column 33 and the push slider during radial movement.

[0037] Embodiment 3, on the basis of embodiment 2, as Figure 3 , 4 As shown in Figures 1 and 8, the axial pushing mechanism 4 includes an axial pushing sleeve 41 rotatably arranged outside the clamp base 13 of the clamp body 1. The axial pushing sleeve 41 is designed to be a thin-walled sleeve with a wall thickness of preferably 12 mm to 14 mm. The clamp base 13 is provided with a shoulder 131 for matching with one end of the axial pushing sleeve 41. The shoulder is used to limit the axial position of the axial pushing sleeve. The axial pushing sleeve 41 is matched with the hole-axis clearance of the clamp base 13, and the matching clearance is preferably 0.1 mm to 0.15 mm. The other end of the axial pushing sleeve 41 is axially positioned by the positioning flange 12 to fix the axial position of the axial pushing sleeve and realize circumferential free rotation.

[0038] The push slider 31 is fixed with a push guide post 42, and the axial push sleeve 41 is provided with a plurality of inclined grooves 43 respectively cooperating with the push guide posts 42. The number and position of the inclined grooves 43 and the slide grooves I are arranged correspondingly. When the axial push sleeve 41 rotates, the push slider 31 can be slid by the cooperation between the inclined grooves 43 and the push guide posts 42, thereby driving the end of the positioning post 33 to axially pass through or retract the positioning surface of the axial positioning assembly 2. After the workpiece is positioned and fastened, the positioning post 33 is withdrawn from the interference position to avoid affecting the processing of the workpiece.

[0039] As a further embodiment, Figure 5 As shown, an axial push sleeve handle 44 is connected to the axial push sleeve 41, a positioning sleeve 45 is provided on the axial push sleeve handle 44, and a spring 46 is provided on the axial push sleeve handle 44 to cooperate with the positioning sleeve 45. The axial push sleeve handle 44 is threadedly connected to the axial push sleeve 41, and the axial push sleeve handle is operated to provide power for the rotation of the axial push sleeve during the positioning process.

[0040] Specifically in this embodiment, the outer circle of the axial push sleeve 41 is designed with three evenly distributed bevel grooves 43, and the starting point and the end point of the center line of the three bevel grooves 43 are at the same distance from the same end face of the axial push sleeve, and the dimensional tolerance is preferably less than 0.02mm. The center line of the three bevel grooves is at a positive angle with the axis of the axial push sleeve 41 and is equal, and the angle is preferably 5°~7°. And the bevel groove 43 penetrates the axial push sleeve 41 in the radial direction. The push guide post 42 is threadedly connected to the push slider 31, and the three push guide posts 42 are respectively arranged in the three bevel grooves 43. When the axial push sleeve 41 rotates, the push guide post 42 slides along the bevel groove 43. In this embodiment, the axial push stroke of the bevel groove 43 is 6.5mm~8mm. Under the limitation of the freedom of the slider guide pair composed of the slide groove I of the push slider 31 and the fixture base 13, the push guide post 42 moves axially along the fixture base 13 to generate axial power.

[0041] Embodiment 4, on the basis of embodiment 3, the radial spreading mechanism 5 comprises a radial push disk 51 rotatably arranged on the outside of the clamp body 1, and the radial push disk 51 is provided with a plurality of spiral grooves 52 in the circumferential direction, and the positioning posts 33 are respectively correspondingly arranged in the spiral grooves 52, and the matching clearance between the two is 0.1mm~0.15mm; the radial push disk 51 is connected with a radial push disk handle 53. Specifically in this embodiment, the radial push disk 10 is installed on the positioning step of the clamp base 13, and is matched with the clamp base 13 by a hole shaft, and the matching clearance is preferably less than 0.015mm, and the matching clearance meets the radial positioning accuracy and can rotate freely. One end of the radial push disk is positioned by a shaft shoulder, and the other end is positioned axially by the clamp bearing disk of the axial positioning assembly 2.

[0042] In this embodiment, three spiral grooves are evenly distributed on the end surface of the radial push disk 51, the arc lengths of the three spiral grooves are equal, and the arc length tolerance is preferably less than 0.01mm. The starting point and the end point of the center line are at equal distances from the central axis of the radial push disk, and the distance tolerance is preferably less than 0.012mm. The pitches of the three spiral grooves are equal, and the error is preferably less than 0.01mm, and the groove depth runs through the radial push disk. The positioning column 33 is installed in the spiral groove, and the two are clearance-matched. The diameters of the three positioning columns 33 are consistent and the error is less than 0.006mm.

[0043] Embodiment 5, on the basis of embodiment 4, the axial positioning assembly 2 comprises a fixture carrier plate 41 fixedly connected to the fixture body 1, and an axial positioning ring 42 is connected to the fixture carrier plate 41, and the outer wall of the axial positioning ring 42 is an axial positioning surface. The axial positioning ring 42 is used to position the end face of the workpiece being processed, and is bolted to the fixture carrier plate 41. The shape is preferably a circular ring with the same inner and outer diameter as the positioning surface of the workpiece or 1-3 mm larger. As an optional solution, the axial positioning ring can be selected to be composed of multiple half-ring segments arranged in an annular shape.

[0044] As a further implementation, a slide groove II is provided on the fixture carrier plate 41, and the slide groove II is arranged along the radial direction of the fixture carrier plate 41. The slide groove II is a U-shaped groove, and a radial slider 54 is slidably provided on the slide groove II. The radial slider 54 is provided with a through hole to meet the penetration of the positioning column 33. The positioning column 33 and the through hole adopt a smaller hole-axis matching clearance, and the matching clearance is preferably less than 0.01mm, which not only meets the positioning accuracy requirements of the fixture, but also meets the free axial movement of the positioning column 33 in the hole. When the slider is pushed to move axially, it can drive the end of the positioning column 33 to pass through or retract into the through hole on the radial slider 54, eliminating interference with the workpiece processing. Specifically, the telescopic stroke of the positioning column 33 passing through or retracting the radial slider 54 at least meets the extension of 5mm~6mm and the retraction of 0.2mm~1mm.

[0045] Specifically in this embodiment, the fixture carrier plate 41 is used to carry the axial positioning ring 42 and the radial slider 54 to achieve axial positioning and radial centering. A positioning step is set at one end of the fixture carrier plate, which cooperates with the hole axis of the fixture base 13, and the end face is positioned. The two end faces are bolted and pressed. The fixture base 13 is used to carry the radial push plate, the push slider, the axial push sleeve, and the connection fixture carrier plate and the positioning flange, and cooperates with the hole axis of the fixture carrier plate and the positioning flange bolt connection. The fixture carrier plate provides an installation carrier for the radial slider, the fixture protective cover, and the axial positioning ring.

[0046] When the radial push plate 51 rotates, the spiral groove drives the positioning column 33 to slide along the groove, and the positioning column moves radially under the freedom limit of the slider guide pair composed of the radial slider 54 and the slide groove II of the fixture carrier plate. The radial movement of the positioning column 33 realizes the radial tightening and loosening of the positioning surface of the inner hole of the workpiece, completing the radial centering positioning of the workpiece.

[0047] As a further implementation, in addition, protective blocks 55 are provided on both sides of the radial slider 54 , and the protective blocks 55 are used to seal the matching gap between the radial slider 54 and the slide groove II of the fixture carrier plate 18 .

[0048] As a further optional specific implementation, the radial slider is slidably connected to the fixture carrier plate, and a groove is designed between the two ends of the radial slider. The distance between the bottom of the groove of the radial slider is smaller than the width of the groove II of the fixture carrier plate, and the difference is preferably less than 0.015mm. The groove of the radial slider is assembled in the groove II of the fixture carrier plate to form a slider guide pair. The matching clearance between the radial slider and the fixture carrier plate meets the fixture positioning accuracy requirements and can achieve free sliding. The matching of the radial slider and the fixture carrier plate limits the two rotational degrees of freedom and two movement degrees of freedom of the positioning column.

[0049] Embodiment 6, on the basis of embodiment 5, in order to avoid damage and influence of precision of moving elements by chips and debris, the clamp body 1 is connected to the outside with a clamp protection cover 6, and the clamp protection cover 6 is provided with long grooves 64 to meet the action of the axial pushing sleeve handle 44 of the axial pushing mechanism 4 and the radial pushing disk handle 53 of the radial spreading mechanism 5. Specifically, one end of the clamp protection cover 6 is connected to the outer circle of the positioning flange 12, and a plurality of bolt mounting holes are designed on the outer circle of the connection between the clamp protection cover 6 and the positioning flange 12, and corresponding mounting threaded holes are designed on the outer circle of the connection between the positioning flange 12 and the clamp protection cover 6, and the two are fastened and connected by bolts. In order to further ensure the stability of the clamp protection cover during the processing, the other end of the clamp protection cover 6 is bolted and pressed to the end face of the clamp carrier plate 41.

[0050] Specifically, the clamp protective cover 6 is sealed with the outer circle of the positioning flange 12 and the clamp supporting plate 41, and the moving parts such as the pushing slider 31, the axial pushing sleeve 41, the pushing guide column 42, the positioning column 33, the radial pushing plate 51, and the clamp base 13 are sealed in the clamp protective cover 3 to prevent the entry of debris and cause abnormal wear.

[0051] As a further embodiment, Figure 5 , 6 As shown, the long groove 64 is opened in the circumferential direction, and an arc-shaped protective cover 61 for cooperating with the axial pushing mechanism 4 or the radial spreading mechanism 5 respectively is slidably provided on the clamp protective cover 6 where the long groove 64 is located. Specifically, the arc-shaped protective cover 61 cooperates with the arc of the clamp protective outer cover 6, and a through hole is provided in the middle part of the arc-shaped protective cover 61 to accommodate the axial pushing sleeve handle 44 or the radial pushing disk handle 53. When the axial pushing sleeve handle 44 or the radial pushing disk handle 53 can move, it can drive the arc-shaped protective cover 61 to slide along the outer circle of the clamp protective outer cover 6.

[0052] As a further embodiment, in order to achieve the locking of the axial push sleeve during the processing, a circular hole portion 65 for penetrating the positioning sleeve 45 to achieve position locking is provided at the end of the long slot 64. The diameter of the circular hole portion 65 is larger than the outer diameter of the positioning step of the positioning sleeve 45 on the axial push sleeve handle 44. At the same time, the outer diameter of the positioning step of the positioning sleeve 45 is larger than the slot width of the long slot. The positioning sleeve 45 is slidably penetrated in the through hole in the middle of the arc-shaped protective cover 61. When the axial push sleeve handle 44 slides in the long slot, the positioning sleeve 45 has a diameter larger than the width of the long slot, so it cannot enter the long slot. When the axial push sleeve handle moves to the circular hole portion at the end of the long slot, the positioning sleeve is pressed into the circular hole portion under the action of the spring, so as to achieve the locking of the position of the axial push sleeve handle, and prevent the axial push sleeve from rotating during the rotation of the clamp of the present invention, driving the positioning column to extend, and causing processing interference with the positioning surface of the workpiece.

[0053] As a further embodiment, the arc-shaped protective cover 61 is provided with a long waist hole 62, and a bolt 63 connected to the clamp protective cover 61 is passed through the long waist hole 62. The length of the long waist hole 62 is greater than the rotation arc length of the axial push sleeve 41 and the radial push disk 51. The bolt passes through the long waist hole 62 and is connected to the clamp protective cover 6, and the arc-shaped protective cover 61 is confined on the clamp protective cover 6. When the axial push sleeve handle 44 or the radial push disk handle 53 drives the arc-shaped protective cover 61 to slide, the bolt cooperates with the long waist hole 62 to realize sliding guidance. The internal parts are fully enclosed under the sealing of the arc-shaped protective cover and the clamp protective cover.

[0054] As a further embodiment, the fixture protective cover 61 and the axial positioning assembly 2 are provided with connection holes for connecting the workpiece 7 by bolts. When connected with the workpiece, the bolts are inserted into the connection holes along the axial direction to achieve fixed connection of the workpiece. Specifically, the fixture protective cover 61, the fixture carrier plate 41 and the axial positioning ring 42 are designed with connection holes for clamping according to the threaded mounting holes of the workpiece 7. The connection holes of the three components are interlinked and used to pass the fastening bolts, and the workpiece is pressed against the axial positioning ring 42 by the bolts.

[0055] The method of using the present invention is as follows: push the radial push disk handle to radially retract the three positioning columns to a diameter smaller than the positioning diameter of the workpiece, lift the positioning sleeve, push the axial push sleeve handle to extend the three positioning columns out of the radial slider, and extend the axial positioning ring by about 5 mm, match the reference hole of the workpiece with the three positioning columns, and the threaded mounting hole of the workpiece 7 corresponds to the connecting hole of the device, push the radial push disk handle to radially move the three positioning columns to tighten the workpiece. Use the fastening bolts inserted in the connecting hole to tighten the workpiece on the axial positioning ring 42, and push the radial push disk handle to radially retract the three positioning columns to a diameter smaller than the reference hole of the workpiece. Push the axial push sleeve handle to retract the three positioning columns into the through hole of the radial slider. Under the thrust of the spring, the positioning sleeve enters the circular hole portion 64 used for positioning on the fixture protective cover to achieve locking. While achieving radial positioning, it avoids the interference of the positioning element with the processing part, and the workpiece is clamped.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-centering anti-interference flange type clamping machining device, characterized in that: The clamp body (1) comprises an axial positioning component (2) fixedly provided at the front end of the clamp body (1), a centering component (3) movable in the axial and radial directions is provided on the clamp body (1), and the positioning surface of the axial positioning component (2) and the positioning end of the centering component (3) are used to perform axial positioning and centering positioning on a workpiece (7) respectively; The centering component (3) is connected to the axial pushing mechanism (4), and the axial pushing mechanism (4) is used to drive the centering component (3) to slide axially, so that the positioning end of the centering component (3) is extended or retracted relative to the positioning surface of the axial positioning component (2) in the axial direction; the clamp body (1) is provided with a radial expansion mechanism (5), and the radial expansion mechanism (5) is used to drive the centering component (3) to expand or retract radially.

2. The self-centering anti-interference flange clamping machining device according to claim 1 is characterized in that: The centering assembly (3) comprises a plurality of slide grooves I circumferentially arranged on the clamp body (1), the slide grooves I being arranged along the axial direction of the clamp body (1), a pushing slider (31) being slidably arranged on the slide grooves I, the pushing slider (31) being matched with the axial pushing mechanism (4), and a clamp seat portion (32) being arranged on the pushing slider (31); a positioning column (33) being arranged on the clamp seat portion (32), the axis of the positioning column (33) being parallel to the sliding direction of the pushing slider (31), and being able to slide radially on the clamp seat portion (32) along the clamp body (1).

3. The self-centering anti-interference flange type clamping machining device according to claim 2 is characterized in that: The axial pushing mechanism (4) comprises an axial pushing sleeve (41) rotatably arranged on the outside of the clamp body (1); a pushing guide column (42) is fixedly arranged on the pushing slider (31); and the axial pushing sleeve (41) is provided with a plurality of inclined grooves (43) respectively cooperating with the pushing guide columns (42); when the axial pushing sleeve (41) rotates, the pushing slider (31) can slide by utilizing the cooperation between the inclined grooves (43) and the pushing guide columns (42), thereby driving the end of the positioning column (33) to axially pass through or retract the positioning surface of the axial positioning component (2).

4. The self-centering anti-interference flange type clamping machining device according to claim 3 is characterized in that: The axial pushing sleeve (41) is connected to an axial pushing sleeve handle (44), a positioning sleeve (45) is provided on the axial pushing sleeve handle (44), and a spring (46) cooperating with the positioning sleeve (45) is provided on the axial pushing sleeve handle (44).

5. The self-centering anti-interference flange clamping machining device according to any one of claims 2 to 4, characterized in that: The radial spreading mechanism (5) comprises a radial pushing disk (51) rotatably arranged outside the clamp body (1), a plurality of spiral grooves (52) being circumferentially arranged on the radial pushing disk (51), and positioning posts (33) being respectively arranged in the spiral grooves (52); and a radial pushing disk handle (53) is connected to the radial pushing disk (51).

6. The self-centering anti-interference flange type clamping machining device according to claim 5 is characterized in that: The axial positioning assembly (2) comprises a clamp carrier plate (21) fixedly connected to the clamp body (1), an axial positioning ring (22) being connected to the clamp carrier plate (21), and an outer side wall of the axial positioning ring (22) being an axial positioning surface.

7. The self-centering anti-interference flange type clamping machining device according to claim 6 is characterized in that: The fixture carrier plate (21) is provided with a slide groove II, which is arranged along the radial direction of the fixture carrier plate (21), and a radial slider (54) is slidably arranged on the slide groove II, and a through hole is provided on the radial slider (54) to allow the positioning column (33) to pass through, and protective blocks (55) are provided on both sides of the radial slider (54).

8. The self-centering anti-interference flange clamping machining device according to any one of claims 1 to 4, 6 and 7, characterized in that: The clamp body (1) is externally connected to a clamp protection outer cover (6), and the clamp protection outer cover (6) is provided with a long groove (64) that satisfies the action of the axial pushing mechanism (4) and the radial spreading mechanism (5), and an arc-shaped protective cover (61) is slidably provided on the long groove (64) for cooperating with the axial pushing mechanism (4) or the radial spreading mechanism (5), respectively, and a long waist hole (62) is provided on the arc-shaped protective cover (61), and a bolt (63) connected to the clamp protection outer cover (61) is passed through the long waist hole (62) to realize sliding guidance; a round hole portion (65) is provided at the end of the long groove (64).

9. The self-centering anti-interference flange type clamping machining device according to claim 8, characterized in that: The clamp body (1) comprises a coaxially arranged transition flange (11), a positioning flange (12), and a clamp base (13); the clamp base (13) is provided with a shaft shoulder (131) for cooperating with the axial pushing mechanism (4); and the transition flange (11) is provided with a tapered hole or a plane or a clamping step for cooperating with a machine tool.

10. The self-centering anti-interference flange type clamping machining device according to claim 9, characterized in that: The fixture protective outer cover (61) and the axial positioning assembly (2) are provided with connection holes for connecting the workpiece (7) via bolts.

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