Positioning fixture and positioning sleeve processing method

Abstract

The present application relates to the technical field of machining, in particular to a positioning clamp and a positioning sleeve machining method. The positioning clamp comprises a base assembly, a fixing assembly and an expansion assembly. The base assembly comprises a base body, a positioning part and a positioning column. The positioning part and the positioning column are connected with the base body respectively. The fixing assembly comprises a pressing unit and a locking screw. The pressing unit is detachably connected with the base body through the locking screw. The positioning part, the pressing unit and the adjacent two positioning columns form a containing space. The clamping state of the positioning clamp comprises that the positioning sleeve is placed in the containing space, the base body is in abutment with the bottom surface of the bottom plate, the positioning part and the fixing assembly are in abutment with the opposite sides of the bottom plate respectively, and the expansion assembly is located between the two lugs and exerts a force along the radial direction of the bottom plate, so as to abut the two lugs on the two positioning columns respectively. In this way, the problem of low machining efficiency caused by repeated clamping for positioning sleeve machining is solved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and more specifically, to a method for machining a positioning fixture and a positioning sleeve. Background Technology

[0002] The positioning sleeve is a key component of the servo motor. It is an irregularly shaped, thin-walled, elastic structure with thin lugs. It has many machined surfaces and requires high precision in surface flatness. It is prone to deformation and vibration during machining, making it quite difficult to manufacture. In current machining methods, the traditional approach is to use a conventional milling machine, using the hole positions and bottom surface of the part as positioning references, and completing the machining of the entire surface by repeatedly clamping and rotating the positioning mandrel.

[0003] Existing machining methods are mostly conventional milling, which requires multiple clamping operations, is cumbersome, has low production efficiency, and is prone to operational errors due to manual rotation and angle adjustment, resulting in unstable machining quality. At the same time, frequent clamping makes it impossible for operators to manage multiple machines simultaneously, which does not meet the production requirements of high efficiency and manual reduction. In CNC machining attempts, due to the structural problems of the parts, clamping is prone to misalignment and inconsistent machining center points of multiple parts. Thin-walled lugs are also prone to elastic deformation and machining vibration, making it impossible to guarantee the machining dimensional accuracy and making it difficult to complete all machining in one clamping. Summary of the Invention

[0004] To address the problem of low processing efficiency caused by repeated clamping during the machining of positioning sleeves, this invention provides a positioning fixture and a method for machining positioning sleeves.

[0005] In a first aspect, the positioning fixture provided by the present invention is used to fix a positioning sleeve for machining an assembly surface; the positioning sleeve includes a base plate and a support lug, the support lug being connected to the top surface of the base plate, and the assembly surface including two mutually opposite sides on the support lug and spaced apart circumferentially along the base plate; the positioning fixture includes:

[0006] The base assembly includes a base body, a positioning part, and a positioning post; the positioning part and the positioning post are respectively connected to the base body.

[0007] The fixing component includes a clamping unit and a locking screw; the clamping unit is detachably connected to the base body via the locking screw; the positioning part, the clamping unit, and two adjacent positioning posts together form an accommodating space;

[0008] Expansion assembly;

[0009] The clamping state of the positioning fixture includes: the positioning sleeve is placed in the accommodating space, the base body abuts against the bottom surface of the base plate, the positioning part and the fixing component abut against the opposite sides of the base plate respectively, and the expansion component is located between the two supports and applies a radial outward force along the base plate, thereby abutting the two supports against the two positioning posts respectively.

[0010] Optionally, the tensioning assembly includes a tensioning unit and a tensioning part; the tensioning unit includes an expansion body and a support plate; the two support plates are respectively connected to the outer side wall of the expansion body; a fourth fixing hole is provided on the top surface of the expansion body;

[0011] The clamping state further includes: the expansion part is detachably connected to the expansion body through the fourth fixing hole, thereby expanding the radial dimension of the expansion body, so that the support plate presses the two lugs against the two positioning posts respectively.

[0012] Optionally, the expander includes an expansion portion, a support portion, and a fourth fixing hole; a plurality of expansion portions are distributed at intervals along the circumference of the support portion; the expansion portions are connected to the support portion; the plurality of expansion portions together form the fourth fixing hole; each support plate corresponds to one expansion portion; the support plate is connected to the outer side wall of the corresponding expansion portion;

[0013] The fourth fixing hole has an internal thread on its wall, the outer wall of the expansion joint has an external thread, and the radial dimension of the expansion joint gradually increases from bottom to top.

[0014] Optionally, the support plate includes a support body and a protrusion; the support body is connected to the corresponding expansion portion; the length direction of the support body is parallel to the axis of the fourth fixing hole; the protrusion is located on the side of the support body away from the expansion portion; the protrusion is located at the middle position of the length direction of the support body.

[0015] Optionally, when the fourth fixing hole is vertically arranged, the end of the expansion portion away from the support portion and the protrusion portion are at the same height.

[0016] Optionally, the tensioning assembly further includes a positioning pin; the tensioning unit further includes a second lug; the second lug is connected to the top end of the support plate and extends radially along the base plate, and the fifth fixing hole passes through the second lug along the axial direction of the base plate;

[0017] The positioning sleeve further includes a first lug and a first fixing hole; the first lug is connected to the top end of the support lug and extends radially along the base plate, and the first fixing hole passes through the first lug along the axial direction of the base plate.

[0018] The clamping state also includes: the positioning pin passing through the fifth fixing hole and the first fixing hole in sequence.

[0019] Optionally, the clamping unit includes a clamping part, a mounting part, and a second fixing hole; the clamping part is connected to the mounting part; the second fixing hole penetrates the mounting part; the base assembly further includes a third fixing hole; the third fixing hole is recessed on the surface of the base body;

[0020] The clamping state further includes: the clamping unit is located on the upper surface of the base body; the second fixing hole and the third fixing hole are both vertically arranged; the screw of the locking screw passes through the second fixing hole and is screwed into the third fixing hole, the lower end of the screw head of the locking screw abuts against the mounting part, the clamping part and the base plate are arranged adjacent to each other in the horizontal direction and abut against each other; the contact surface of the clamping part and the base plate pressing against each other is inclined.

[0021] Optionally, the top surface of the base body is provided with a mounting groove; the third fixing hole is located on the inner bottom wall of the mounting groove; the mounting groove is used to accommodate the clamping unit.

[0022] Optionally, multiple positioning posts are arranged in a matrix at intervals along the first direction and the second direction on the base body; multiple fixing components are arranged in a matrix at intervals along the first direction and the second direction on the base body; the positioning part is stepped.

[0023] The clamping state further includes: the positioning part, one of the expansion components, one of the fixing components, and any two adjacent positioning pins along the first direction clamping a positioning sleeve.

[0024] In a second aspect, the positioning sleeve processing method provided by the present invention is applied to any of the positioning fixtures in the first aspect; the positioning sleeve processing method includes:

[0025] Place the positioning sleeve in the accommodating space so that the base plate fits against the base body, one radial end of the base plate contacts the positioning part, and the support ear is aligned with the positioning post;

[0026] The fixing component is installed on the base assembly and abuts against the end of the base plate away from the positioning part. The fixing component applies a force to the base plate in the direction of the positioning part to clamp the base plate.

[0027] The expansion assembly is placed inside the positioning sleeve and expanded outward so that the expansion assembly applies a radially outward force to the lug along the base plate, pressing the lug against the positioning post;

[0028] The CNC machining program is used to mill the assembly surface of the positioning sleeve.

[0029] To solve the problem of low processing efficiency caused by repeated clamping in the machining of positioning sleeves, the present invention has the following advantages:

[0030] By configuring a base assembly including a base body, a positioning part, and positioning posts, and cooperating with a fixing component detachably connected to the base body, the positioning part, fixing component, and two adjacent positioning posts together form an accommodating space. This allows the base body to abut against the bottom surface of the positioning sleeve's base plate, providing stable bottom support and establishing a positioning reference for the positioning sleeve. Simultaneously, the positioning part and fixing component create abutment limits on opposite sides of the base plate. By placing the positioning sleeve inside the accommodating space and positioning the tensioning component between the two lugs, applying a radially outward force towards the base plate, the two lugs can be abutted against the surfaces of the positioning posts. This restricts the placement of the positioning sleeve from multiple directions, maintaining its posture stability during processing. It allows for single-clamping to complete the overall fixing of the positioning sleeve, eliminating the need for multiple workpiece flips and repeated clamping, effectively improving processing efficiency. It also provides rigid support for thin-walled lugs, preventing elastic deformation and processing vibration during processing, and ensuring stable machining accuracy of the lugs' assembly surfaces along the circumferential side of the base plate. This solves the problems of unstable quality and cumbersome operation caused by multiple clamping operations in traditional processing. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the positioning fixture and positioning sleeve according to one embodiment;

[0032] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0033] Figure 3 for Figure 1 Schematic diagram of the structure of the fixing component and the tensioning component;

[0034] Figure 4 for Figure 1 Schematic diagram of the middle positioning sleeve;

[0035] Figure 5 for Figure 3 Schematic diagram of the structure of the central expansion and tightening component;

[0036] Figure 6 This is a flowchart of a positioning sleeve processing method according to one embodiment.

[0037] Reference numerals: 10, positioning sleeve; 11, end plate unit; 111, base plate; 112, side plate; 113, support lug; 12, first fixing unit; 121, first lug; 122, first fixing hole; 13, assembly surface; 20, base assembly; 21, base body; 22, positioning part; 23, positioning post; 24, mounting groove; 30, fixing assembly; 31, clamping unit; 311, clamping part; 312, mounting part; 313, second fixing hole; 40, expansion assembly; 41, expansion unit; 411, expansion body; 4111, expansion part; 4113, support part; 4114, fourth fixing hole; 412, support plate; 4121, support body; 4122, protrusion; 413, second lug; 414, fifth fixing hole. Detailed Implementation

[0038] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0039] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0040] As a supporting component for related equipment, the positioning sleeve has an irregularly shaped, thin-walled, elastic structure. Its included lug structure is thin, and the assembly surface formed by the lug along the circumferential side of the base plate has strict machining precision requirements. Currently, the traditional machining method for the positioning sleeve's assembly surface relies on a conventional milling machine. Using the holes and bottom surface of the positioning sleeve as positioning references, the assembly surface is machined by repeatedly clamping the sleeve and rotating it using the positioning mandrel. This method is not only cumbersome and inefficient, but manual angle adjustments are also prone to errors, making it difficult to maintain consistent machining quality and unsuitable for multi-equipment collaborative production models. Furthermore, in the machining attempts of the three-axis machining center of CNC milling machine, due to the structural characteristics of the thin-walled elastic structure of the positioning sleeve, the small clamping contact surface, and the remote machining location, it is very easy to have inaccurate clamping and alignment, and inconsistent machining center points of multiple parts. At the same time, the thin lugs are prone to elastic deformation and machining vibration during the clamping and machining stages, which cannot guarantee the machining dimensional accuracy of the assembly surface. Currently, there is no tooling structure that can realize the single clamping and machining of the positioning sleeve and the parallel machining of multiple parts, which makes it difficult to meet the needs of large-scale high-precision machining production.

[0041] Example 1:

[0042] This embodiment proposes a positioning fixture for fixing the positioning sleeve 10 to process the assembly surface 13; such as Figure 4 As shown, the positioning sleeve 10 includes a base plate 111 and a support lug 113. The support lug 113 is connected to the top surface of the base plate 111. The assembly surface 13 includes two opposing sides on the support lug 113 that are spaced apart circumferentially along the base plate 111. Figure 1 As shown, the positioning fixture includes a base assembly 20, a fixing assembly 30, and a tensioning assembly 40.

[0043] The base assembly 20 includes a base body 21, a positioning part 22, and a positioning post 23; the positioning part 22 and the positioning post 23 are respectively connected to the base body 21.

[0044] The fixing component 30 includes a clamping unit 31 and a locking screw; the clamping unit 31 is detachably connected to the base body 21 via the locking screw; the positioning part 22, the fixing component 30, and two adjacent positioning posts 23 together form an accommodating space.

[0045] The base body 21 can provide stable bottom support for the positioning sleeve 10 and form a positioning reference; the positioning part 22 can limit one side of the base plate 111 and provide a matching reference for the clamping of the subsequent fixing component 30.

[0046] like Figure 2 As shown and Figure 3As shown, the clamping state of the positioning fixture includes: the positioning sleeve 10 is placed in the accommodating space, the base body 21 abuts against the bottom surface of the base plate 111, the positioning part 22 and the fixing component 30 abut against the opposite sides of the base plate 111 respectively, and the expansion component 40 is located between the two lugs 113 and applies a radially outward force along the base plate 111, thereby abutting the two lugs 113 against the two positioning posts 23 respectively. The accommodating space formed in this way can limit the position of the positioning sleeve 10 from multiple directions, ensuring the stability of the positioning sleeve 10's posture during subsequent processing. Compared with traditional processing that requires multiple clamping, this single clamping can achieve the overall fixation of the positioning sleeve 10 without multiple flipping, which can improve processing efficiency. Moreover, by applying a radially outward expansion force between the two lugs 113 through the expansion component 40, the lugs 113 abut against the positioning posts 23, providing support for the lugs 113 and preventing vibration caused by the lugs 113 not being fixed during processing, thereby ensuring the processing accuracy of the assembly surface 13.

[0047] Furthermore, such as Figure 5 As shown, the tensioning assembly 40 includes a tensioning unit 41 and a tensioning part; the tensioning unit 41 includes an expansion body 411 and a support plate 412; the two support plates 412 are respectively connected to the outer side wall of the expansion body 411; a fourth fixing hole 4114 is provided on the top surface of the expansion body 411.

[0048] The clamping state also includes: the expansion joint is detachably connected to the expansion body 411 through the fourth fixing hole 4114, thereby increasing the radial dimension of the expansion body 411, so that the support plate 412 presses the two lugs 113 against the two positioning posts 23 respectively. In this way, the expansion joint controls the expansion force output of the expansion body 411, which can be adapted to the structural characteristics of the thin-walled elastic lugs 113, preventing the lugs 113 from deforming due to excessive expansion force, and balancing the firmness of the expansion and the integrity of the lugs 113. Moreover, by using the support plate 412 as the expansion medium between the expansion body 411 and the lugs 113, the contact area of ​​the expansion force is increased, so that the expansion force can be evenly output to the inside of the lugs 113, so that the entire lug 113 can be evenly clamped, avoiding vibration caused by uneven local force on the lugs 113 during processing.

[0049] Furthermore, such as Figure 5 As shown, the expansion body 411 includes an expansion portion 4111, a support portion 4113, and a fourth fixing hole 4114; multiple expansion portions 4111 are distributed circumferentially along the support portion 4113; the expansion portions 4111 are connected to the support portion 4113; the multiple expansion portions 4111 together form the fourth fixing hole 4114; each support plate 412 corresponds to one expansion portion 4111; the support plate 412 is connected to the outer side wall of the corresponding expansion portion 4111.

[0050] The fourth fixing hole 4114 has an internal thread on its hole wall and an external thread on the outer side wall of the expansion part. The radial dimension of the expansion part gradually increases from bottom to top.

[0051] This screwing tightening mechanism allows each expansion section 4111 to be evenly spread out, achieving controllable output of tightening force. It avoids excessive tightening force caused by instantaneous tightening, which could lead to excessive local stress and deformation of the lug 113. Furthermore, this concentrates deformation in the expansion section 4111, while the support section 4113 maintains a rigid structure. This ensures effective tightening and maintains the overall structural strength of the expansion body 411, preventing excessive deformation caused by repeated tightening and thus extending its service life. It is worth noting that the tightening mechanism is screw-shaped, and its radial dimension gradually increases from bottom to top. This could be due to either the radial dimension of the screw portion or the radial dimension of the screw head gradually increasing from bottom to top.

[0052] Furthermore, such as Figure 5 As shown, the support plate 412 includes a support body 4121 and a protrusion 4122; the support body 4121 is connected to the corresponding expansion portion 4111; the length direction of the support body 4121 is parallel to the axis of the fourth fixing hole 4114; the protrusion 4122 is located on the side of the support body 4121 away from the expansion portion 4111; the protrusion 4122 is located at the middle position in the length direction of the support body 4121. Thus, when the tensioning assembly 40 applies tensioning force, the protrusion 4122 first abuts against the lug 113. During tensioning and processing, friction loss is concentrated on the protrusion 4122, which can effectively avoid friction loss of the support body 4121. Long-term tensioning or processing can also ensure the structural integrity of the support body 4121. Furthermore, the protrusion 4122 has a certain thickness, so even if it wears to a certain extent, it can still effectively apply tensioning force to the lug 113, thus extending the service life of the tensioning assembly 40.

[0053] Furthermore, when the fourth fixing hole 4114 is vertically oriented, the end of the expansion portion 4111 furthest from the support portion 4113 is flush with the height of the protrusion 4122. This ensures that the tensioning force of the expansion portion 4111 is transmitted to the protrusion 4122 at the same height, resulting in a shorter force transmission path and a more uniform clamping force between the protrusion 4122 and the lug 113. This ensures a tight fit between the lug 113 and the positioning post 23, avoids vibration caused by machining, and guarantees the machining accuracy of the assembly surface 13. Moreover, during tensioning, the expansion portion 4111 and the protrusion 4122 undergo radial deformation at the same height, which avoids local stress concentration caused by height differences and prevents severe deformation or bending and breakage at the connection between the support portion 4113 and the expansion portion 4111, thus improving the overall durability of the tensioning assembly 40.

[0054] Furthermore, the tensioning assembly 40 also includes a positioning pin; the tensioning unit 41 also includes a second lug 413; the second lug 413 is connected to the top of the support plate 412 and extends radially along the base plate 111, and the fifth fixing hole 414 passes through the second lug 413 along the axial direction of the base plate 111.

[0055] The positioning sleeve 10 also includes a first lug 121 and a first fixing hole 122; the first lug 121 is connected to the top end of the support lug 113 and extends radially along the base plate 111, and the first fixing hole 122 passes through the first lug 121 along the axial direction of the base plate 111.

[0056] The clamping state also includes: the positioning pin passing through the fifth fixing hole 414 and the first fixing hole 122 in sequence. This allows for radial and circumferential positioning at the top of the lug 113, further restricting the position of the positioning sleeve 10, preventing radial and axial displacement of the positioning sleeve 10 during processing, and further preventing positioning vibration during processing, thereby ensuring the processing accuracy of the assembly surface 13.

[0057] In other embodiments, the top of the positioning post 23 is provided with a sixth fixing hole, which is recessed from the top of the positioning post 23 along the axial direction of the base plate 111. The clamping state also includes the positioning pin passing sequentially through the fifth fixing hole 414, the first fixing hole 122, and the sixth fixing hole. In this way, the positioning pin can constrain the alignment of the first lug 121, the second lug 413, and the top of the positioning post 23, ensuring the positioning accuracy of the lug 113 and the positioning post 23, and further improving the machining accuracy.

[0058] In other embodiments, the gap between the positioning pin and the fifth fixing hole 414 is greater than the gap between the positioning pin and the first fixing hole 122. When the expansion assembly 40 expands, the support plate 412 will cause the second lug 413 and the fifth fixing hole 414 to undergo radial displacement. The gap between the positioning pin and the fifth fixing hole 414 is greater than the gap between the positioning pin and the first fixing hole 122, which can provide compensation space so that the positioning pin will not tilt due to the displacement of the fifth fixing hole 414 being rigidly pushed by the hole wall. This ensures that the positioning pin always remains in a vertical state, avoids the tilted positioning pin from exerting a pushing force on the first lug 121 and the support lug 113, and prevents the support lug 113 from disengaging from the tight fit with the positioning post 23, thus ensuring the positioning accuracy of the support lug 113.

[0059] In other embodiments, the positioning post 23 and the base body 21 are integrally formed. This avoids gaps caused by the assembly of the positioning post 23 and the base body 21, and the relative position of the positioning post 23 and the base body 21 is more stable. This can prevent the positioning post 23 from shifting due to vibration during processing, and can ensure processing accuracy.

[0060] Furthermore, such as Figure 3As shown, the clamping unit 31 includes a clamping part 311, a mounting part 312, and a second fixing hole 313; the clamping part 311 is connected to the mounting part 312; the second fixing hole 313 penetrates the mounting part 312; the base assembly 20 also includes a third fixing hole; the third fixing hole is recessed on the surface of the base body 21.

[0061] The clamping state also includes: the clamping unit 31 is located on the upper surface of the base body 21; the second fixing hole 313 and the third fixing hole are both vertically arranged; the screw of the locking screw passes through the second fixing hole 313 and is screwed into the third fixing hole, the lower end of the screw head of the locking screw abuts against the mounting part 312, the clamping part 311 and the base plate 111 are arranged adjacent to each other in the horizontal direction and abut against each other; the contact surface of the clamping part 311 and the base plate 111 pressing against each other is inclined.

[0062] The inclined contact surface between the clamping part 311 and the base plate 111 allows the clamping part 311 to clamp the base plate 111 horizontally for lateral positioning, and simultaneously limit the base plate 111 vertically, pressing it firmly against the base body 21. This makes the positioning of the base plate 111 more secure and further ensures the machining accuracy of the assembly surface 13. Furthermore, the locking screw is screwed into the third fixing hole, and the self-locking characteristic of the thread ensures that the clamping force of the clamping unit 31 on the base plate 111 remains constant, preventing loosening due to vibration during processing and ensuring that the base plate 111 is always in a precisely positioned state.

[0063] Furthermore, the top surface of the base 21 is provided with a mounting groove 24; the third fixing hole is located on the inner bottom wall of the mounting groove 24; the mounting groove 24 is used to accommodate the clamping unit 31. In this way, the mounting groove 24 can provide a space for the clamping unit 31, limit the horizontal position of the clamping unit 31, prevent the position of the clamping unit 31 from shifting before the locking screw is tightened, ensure the alignment of the second fixing hole 313 and the third fixing hole, reduce the position adjustment time of the clamping unit 31 during clamping, and improve operating efficiency. Moreover, when the clamping force is applied by tightening the locking screw, the clamping unit 31 will not shift horizontally due to the force, which can ensure the precise contact between the clamping part 311 and the inclined contact surface of the base plate 111, and avoid the problem of the abutment position shift and clamping force failure caused by the shift of the clamping unit 31.

[0064] Furthermore, multiple positioning posts 23 are arranged in a matrix at intervals along the first direction and the second direction on the base body 21; multiple fixing components 30 are arranged in a matrix at intervals along the first direction and the second direction on the base body 21; the positioning part 22 is stepped;

[0065] The clamping state also includes: a positioning part 22, a tensioning component 40, a fixing component 30, and any two adjacent positioning posts 23 along the first direction clamping a positioning sleeve 10. Such a base body 21 can limit the positioning of multiple positioning sleeves 10. Compared to single positioning in traditional machining, it can adapt to the batch processing capabilities of CNC equipment, processing multiple positioning sleeves 10 at once, thus improving processing efficiency. Furthermore, the central positioning post 23 can simultaneously provide clamping support for the positioning sleeves 10 of two adjacent workstations, eliminating the need for a separate positioning post 23 for each workstation. This saves the overall space occupied by multi-workstation fixtures, maximizes the utilization of the base body 21's area, and allows for more machining workstations to be arranged within a limited space, further improving overall processing efficiency.

[0066] In other embodiments, such as Figure 4 As shown, the positioning sleeve 10 includes an end plate unit 11 and a first fixing unit 12. The end plate unit 11 includes a base plate 111, a side plate 112, and a support lug 113. The first fixing unit 12 includes a first lug 121 and a first fixing hole 122. The two side plates 112 are connected to opposite sides of the base plate 111. The support lug 113 is connected to the base plate 111 through the side plates 112. The first lug 121 is connected to the end of the support lug 113 away from the base plate 111. The first fixing hole 122 passes through the first lug 121 along the axial direction of the base plate 111. The mounting surface 13 also includes the surface of the side plate 112 facing away from the base plate 111, i.e., the upper surface of the side plate 112. The mounting surface 13 on the support lug 113 and the mounting surface 13 on the side plate 112 are perpendicular and connected.

[0067] Example 2:

[0068] This embodiment proposes a method for machining the positioning sleeve 10. This machining method can be applied to any of the positioning fixtures in Embodiment 1, such as... Figure 6 As shown, the processing method of the positioning sleeve 10 includes steps S10, S20, S30 and S40, which are executed sequentially.

[0069] Step S10: Place the positioning sleeve 10 into the accommodating space, so that the base plate 111 fits against the base body 21, with one radial end of the base plate 111 contacting the positioning part 22, and the support ear 113 aligned with the positioning post 23. In this way, by having the base plate 111 close to the base body 21, its end abutting against the positioning part 22, and the support ear 113 aligned with the positioning post 23, the positioning sleeve 10 is quickly positioned into the accommodating space, avoiding initial positional deviation and providing a positioning reference for subsequent clamping and processing.

[0070] Step S20: Install the fixing component 30 on the base component 20 and abut against the end of the base plate 111 away from the positioning part 22. The fixing component 30 applies a force to the base plate 111 in the direction of the positioning part 22 to clamp the base plate 111. In this way, the base plate 111 is clamped in one direction first. The two-way horizontal constraint of the positioning part 22 and the fixing component 30 restricts the lateral displacement of the bottom of the positioning sleeve 10. At the same time, the clamping force of the fixing component 30 makes the base plate 111 fit tightly against the base body 21. This can prevent the base plate 111 from tilting upward or shifting in position during processing, and provide a stable foundation for the subsequent tightening of the support lug 113. It also prevents the base plate 111 from shifting when the support lug 113 tightens, and ensures that the transmission of clamping force does not produce deviation.

[0071] Step S30: Place the tensioning assembly 40 inside the positioning sleeve 10 and expand it outwards, so that the tensioning assembly 40 applies a radially outward force along the base plate 111 to the lug 113, pressing the lug 113 tightly against the positioning post 23. This allows the thin-walled elastic lug 113 to be evenly pressed against the positioning post 23 to form a support, restricting the position of the lug 113 and supporting the lug 113, which can avoid the vibration and elastic deformation of the lug 113 during subsequent milling, and ensure the machining accuracy of the lug 113 assembly surface 13.

[0072] Step S40: Program the CNC machining program to mill the assembly surface 13 of the positioning sleeve 10. CNC milling can complete the machining of the assembly surface 13 in one go. Compared with the traditional method of multiple clamping and flipping machining, it can significantly shorten the machining time and improve production efficiency.

[0073] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A positioning fixture for fixing a positioning sleeve to process an assembly surface; the positioning sleeve includes a base plate and lugs, the lugs being connected to the top surface of the base plate, and the assembly surface including two opposing sides on the lugs and spaced apart circumferentially along the base plate; characterized in that, The positioning fixture includes: The base assembly includes a base body, a positioning part, and a positioning post; the positioning part and the positioning post are respectively connected to the base body. The fixing component includes a clamping unit and a locking screw; the clamping unit is detachably connected to the base body via the locking screw; the positioning part, the clamping unit, and two adjacent positioning posts together form an accommodating space; Expansion assembly; The clamping state of the positioning fixture includes: the positioning sleeve is placed in the accommodating space, the base body abuts against the bottom surface of the base plate, the positioning part and the fixing component abut against the opposite sides of the base plate respectively, and the expansion component is located between the two supports and applies a radial outward force along the base plate, thereby abutting the two supports against the two positioning posts respectively.

2. A positioning fixture according to claim 1, characterized in that, The expansion assembly includes an expansion unit and an expansion section; the expansion unit includes an expansion body and a support plate; the two support plates are respectively connected to the outer side wall of the expansion body; a fourth fixing hole is provided on the top surface of the expansion body; The clamping state further includes: the expansion part is detachably connected to the expansion body through the fourth fixing hole, thereby expanding the radial dimension of the expansion body, so that the support plate presses the two lugs against the two positioning posts respectively.

3. A positioning fixture according to claim 2, characterized in that, The expansion body includes an expansion portion, a support portion, and a fourth fixing hole; a plurality of expansion portions are distributed at intervals along the circumference of the support portion; the expansion portions are connected to the support portion; the plurality of expansion portions together form the fourth fixing hole; each support plate corresponds to one expansion portion; the support plate is connected to the outer wall of the corresponding expansion portion; The fourth fixing hole has an internal thread on its wall, the outer wall of the expansion joint has an external thread, and the radial dimension of the expansion joint gradually increases from bottom to top.

4. A positioning fixture according to claim 3, characterized in that, The support plate includes a support body and a protrusion; the support body is connected to the corresponding expansion portion; the length direction of the support body is parallel to the axis of the fourth fixing hole; the protrusion is located on the side of the support body away from the expansion portion; the protrusion is located at the middle position of the length direction of the support body.

5. A positioning fixture according to claim 4, characterized in that, When the fourth fixing hole is vertically arranged, the end of the expansion portion away from the support portion is at the same height as the protrusion portion.

6. A positioning fixture according to claim 4, characterized in that, The tensioning assembly further includes a positioning pin; the tensioning unit further includes a second lug; the second lug is connected to the top end of the support plate and extends radially along the base plate, and the fifth fixing hole passes through the second lug along the axial direction of the base plate; The positioning sleeve further includes a first lug and a first fixing hole; the first lug is connected to the top end of the support lug and extends radially along the base plate, and the first fixing hole passes through the first lug along the axial direction of the base plate. The clamping state also includes: the positioning pin passing through the fifth fixing hole and the first fixing hole in sequence.

7. A positioning fixture according to claim 1, characterized in that, The clamping unit includes a clamping part, a mounting part, and a second fixing hole; the clamping part is connected to the mounting part; the second fixing hole penetrates the mounting part; the base assembly also includes a third fixing hole; the third fixing hole is recessed on the surface of the base body; The clamping state further includes: the clamping unit is located on the upper surface of the base body; the second fixing hole and the third fixing hole are both vertically arranged; the screw of the locking screw passes through the second fixing hole and is screwed into the third fixing hole, the lower end of the screw head of the locking screw abuts against the mounting part, the clamping part and the base plate are arranged adjacent to each other in the horizontal direction and abut against each other; the contact surface of the clamping part and the base plate pressing against each other is inclined.

8. A positioning fixture according to claim 7, characterized in that, The top surface of the base body is provided with a mounting groove; the third fixing hole is located on the inner bottom wall of the mounting groove; the mounting groove is used to accommodate the clamping unit.

9. A positioning fixture according to claim 1, characterized in that, Multiple positioning posts are arranged in a matrix at intervals along a first direction and a second direction on the base body; multiple fixing components are arranged in a matrix at intervals along a first direction and a second direction on the base body; the positioning part is stepped; The clamping state further includes: the positioning part, one of the expansion components, one of the fixing components, and any two adjacent positioning pins along the first direction clamping a positioning sleeve.

10. A method for processing a positioning sleeve, characterized in that, The positioning sleeve machining method is applied to the positioning fixture according to any one of claims 1-9, and the positioning sleeve machining method includes: Place the positioning sleeve in the accommodating space so that the base plate fits against the base, one radial end of the base plate contacts the positioning part, and the support ear is aligned with the positioning post; The fixing component is installed on the base assembly and abuts against the end of the base plate away from the positioning part. The fixing component applies a force to the base plate in the direction of the positioning part to clamp the base plate. The expansion assembly is placed inside the positioning sleeve and expanded outward so that the expansion assembly applies a radially outward force to the lug along the base plate, pressing the lug against the positioning post; The CNC machining program is used to mill the assembly surface of the positioning sleeve.

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