Finish turning clamp for blind hole thin-wall flange

Abstract

The utility model relates to a finish turning clamp for a blind hole thin-wall flange, and relates to the technical field of finish turning clamp manufacturing, the finish turning clamp comprises a mounting mechanism, the mounting mechanism comprises a mounting disc and a positioning cone, the positioning cone is connected with the mounting disc, the end part of the positioning cone is provided with a frustum, and the frustum is used for extending into a blind hole of a workpiece; and the tensioning end of the pulling tensioning mechanism is arranged on the outer side of the positioning cone in a sleeving mode and matched with the frustum, the pulling end of the pulling tensioning mechanism penetrates through the installation disc, and when the pulling end moves in the axial direction, the tensioning end generates displacement in the radial direction so as to abut against the inner side of the blind hole of the workpiece in a tensioning mode. Due to the fact that when the pulling end moves in the axial direction, the tensioning end bears the abutting force of the positioning cone and generates displacement in the radial direction so as to abut against the inner side of the blind hole of the workpiece in a tensioning mode, the workpiece can be fixed, the workpiece cannot be damaged in the fixing process, and the problem that in the prior art, when a blind rivet stretches out, the blind hole workpiece can be collided possibly, and the workpiece cannot be damaged is solved. And the problem that workpieces are possibly damaged exists.

Description

TECHNICAL FIELD

[0001] The utility model relates to fine turning fixture manufacturing technical field, concretely relates to a kind of fine turning fixture for blind hole thin-walled flange. BACKGROUND

[0002] Conventional thin-walled flange is prone to deformation due to its thin wall and insufficient rigidity. Using conventional clamps, uneven clamping force can cause deformation of the part, resulting in errors in machining precision and low pass rate. In turning machining, CNC lathes often encounter such blind hole thin-walled flange parts. If the conventional chuck is used for internal support, the thin-walled part is prone to deformation during machining, which affects the machining precision.

[0003] In the prior art, the clamping is generally performed by expanding sleeve assembly. The traditional expanding sleeve structure generally includes a pull pin structure.

[0004] However, the pull pin may hit the blind hole workpiece when it is extended, which may damage the workpiece. SUMMARY

[0005] The present application provides a fine turning fixture for blind hole thin-walled flange, which can solve the problem of the pull pin hitting the blind hole workpiece when it is extended, which may damage the workpiece.

[0006] In a first aspect, the present application provides a fine turning fixture for blind hole thin-walled flange, which includes:

[0007] A mounting mechanism including a mounting disc and a positioning cone, the positioning cone is connected with the mounting disc, the end of the positioning cone is provided with a conical frustum, and the conical frustum is used to extend into the blind hole of the workpiece;

[0008] A pull expansion mechanism, the expansion end of the pull expansion mechanism is arranged outside the positioning cone and matches the conical frustum, the pull end of the pull expansion mechanism passes through the mounting disc, when the pull end moves along the axial direction, the expansion end generates displacement along the radial direction to tightly abut against the inside of the blind hole of the workpiece.

[0009] In an embodiment, the mounting disc is provided with a receiving cavity, and the pull expansion mechanism includes:

[0010] A pull plate is arranged in the receiving cavity;

[0011] A tension bolt, one end of which extends into the receiving cavity and is connected with the pull plate, and the other end is located outside the receiving cavity as the pull end;

[0012] A flange sleeve connected with the pull plate, the flange sleeve is arranged outside the positioning cone as the tension end sleeve, when the tension bolt is pulled along the axial direction, the flange sleeve generates displacement along the radial direction.

[0013] In an embodiment, a plurality of communication holes are arranged on the side of the installation disc away from the pulling end, and a plurality of bolts corresponding to the communication holes are arranged on the flange sleeve, the bolts pass through the positioning cone and the communication holes to connect with the pull plate.

[0014] In an embodiment, the pull plate comprises an installation part and protruding parts on both sides of the installation part, the installation part is connected with the tension bolt, the protruding parts are connected with the bolts, the thickness of the protruding parts is smaller than that of the installation part, the shape of the accommodation cavity matches the pull plate, and there is a gap between the cavity wall of the accommodation cavity and the protruding parts along the axial direction.

[0015] In an embodiment, the installation disc comprises a connecting disc and an installation body, the connecting disc is provided with an installation hole through which the tension bolt passes, and the inner diameter of the installation hole near one end of the pull plate matches the outer diameter of the installation part, the installation body is provided with a circular truncated cone cavity, the large-diameter cavity of the circular truncated cone cavity is used for accommodating the protruding parts, the small-diameter cavity of the circular truncated cone cavity matches the outer diameter of the installation part, and the installation hole and the circular truncated cone cavity constitute the accommodation cavity.

[0016] In an embodiment, the flange sleeve comprises a connecting section and a tension section, the outer diameter of the connecting section is larger than that of the tension section, the connecting section is connected with the bolt, the inner side of the tension section is provided with a slope, the thickness of one end of the tension section away from the tension bolt is larger than that of the other end, and the corresponding part of the outer side of the tension section of the positioning cone matches the slope.

[0017] In an embodiment, a support flange is further included, the support flange is in a stepped ring shape, is arranged outside the positioning cone, the large-diameter end of the support flange is arranged on the installation disc, and the small-diameter end of the support flange is directed away from the tension bolt and is used for placing the workpiece.

[0018] In an embodiment, the large-diameter end of the positioning cone partially extends into the installation disc, the inner diameter of the large-diameter end of the support flange matches the outer diameter of the large-diameter end of the positioning cone, and the large-diameter end of the support flange is arranged outside the large-diameter end of the positioning cone.

[0019] In an embodiment, a through hole is arranged in the positioning cone along the axial direction.

[0020] In an embodiment, the small-diameter end of the positioning cone is provided with an end cover for closing the outlet of the through hole away from the installation disc.

[0021] The technical scheme provided by the embodiments of the present application has the beneficial effects of:

[0022] In the manufacturing of the fine turning clamp for the blind hole thin wall flange, the mounting mechanism comprises a mounting disc and a positioning cone, the positioning cone is connected with the mounting disc, a frustum is arranged at the end of the positioning cone, the frustum is used to extend into the blind hole of the workpiece, the expansion end sleeve of the expansion mechanism is arranged outside the positioning cone and matched with the frustum, and the pulling end of the expansion mechanism passes through the mounting disc. Since the expansion end is subjected to the abutting force of the positioning cone when the pulling end moves in the axial direction, the displacement in the radial direction is generated to expand and abut against the inner side of the blind hole of the workpiece, the fixation of the workpiece can be completed, and the workpiece is not damaged in the fixation process, and the problem that the puller may hit the blind hole workpiece and damage the workpiece in the prior art is solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 It is a structural schematic view of an embodiment of the fine turning clamp for the blind hole thin wall flange.

[0025] Figure 2 It is a longitudinal sectional structural schematic view of an embodiment of the fine turning clamp for the blind hole thin wall flange.

[0026] Figure 3 It is a structural schematic view of the flange expansion sleeve in an embodiment of the fine turning clamp for the blind hole thin wall flange.

[0027] In the figure: 1, mounting disc; 11, connecting disc; 12, mounting body; 2, positioning cone; 3, expansion mechanism; 31, pull plate; 311, mounting part; 312, protruding part; 32, expansion bolt; 321, screw rod; 322, nut; 33, flange expansion sleeve; 331, connecting section; 332, expansion section; 34, bolt; 4, workpiece; 5, supporting flange; 6, end cover. DETAILED DESCRIPTION

[0028] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0029] The present application provides a fine turning clamp for a blind hole thin wall flange, which can solve the problem that the existing technology may hit such a blind hole workpiece when the pull pin is extended, and there is a possibility of damaging the workpiece.

[0030] As shown in Figure 1 , Figure 2 and Figure 3 , the present application provides a fine turning clamp for a blind hole thin wall flange, which comprises:

[0031] The mounting mechanism comprises a mounting disc 1 and a positioning cone 2, the positioning cone 2 is connected with the mounting disc 1, and the end of the positioning cone 2 is provided with a frustum, which is used to extend into the blind hole of the workpiece 4;

[0032] The pulling and tensioning mechanism 3 is sleeved on the outside of the positioning cone 2 and matched with the frustum, and the pulling end of the pulling and tensioning mechanism 3 passes through the mounting disc 1. When the pulling end moves along the axial direction, the tensioning end generates displacement in the radial direction to be tightly abutted on the inside of the blind hole of the workpiece 4.

[0033] In the manufacturing of the fine turning clamp for a blind hole thin wall flange, the mounting mechanism comprises a mounting disc 1 and a positioning cone 2, the positioning cone 2 is connected with the mounting disc 1, and the end of the positioning cone 2 is provided with a frustum, which is used to extend into the blind hole of the workpiece 4, and the tensioning end of the pulling and tensioning mechanism 3 is sleeved on the outside of the positioning cone 2 and matched with the frustum, and the pulling end of the pulling and tensioning mechanism 3 passes through the mounting disc 1. Since the tensioning end is subjected to the abutting force of the positioning cone 2 when the pulling end moves along the axial direction, it generates displacement in the radial direction to be tightly abutted on the inside of the blind hole of the workpiece 4, the fixation of the workpiece 4 can be completed, and no damage to the workpiece 4 is caused in the fixation process, solving the problem that the existing technology may hit such a blind hole workpiece when the pull pin is extended, and there is a possibility of damaging the workpiece.

[0034] As shown in Figure 1 , Figure 2 and Figure 3 , in some optional embodiments, a containing cavity is arranged in the mounting disc 1, and the pulling and tensioning mechanism 3 comprises:

[0035] A pulling disc 31 is arranged in the containing cavity;

[0036] The tension bolt 32 has one end extending into the receiving cavity and connected to the pull plate 31, while the other end, as the pulling end, is located outside the receiving cavity.

[0037] The flange expansion sleeve 33 is connected to the pull plate 31. The flange expansion sleeve 33 is sleeved on the outside of the positioning cone 2 as the tensioning end. When the tensioning bolt 32 is pulled axially, the flange expansion sleeve 33 will generate displacement in the radial direction.

[0038] In this embodiment, a receiving cavity is provided in the mounting plate 1. The tensioning mechanism 3 includes a pull plate 31, a tensioning bolt 32, and a flange expansion sleeve 33. The pull plate 31 is disposed in the receiving cavity. One end of the tensioning bolt 32 extends into the receiving cavity and is connected to the pull plate 31, while the other end serves as the pulling end and is located outside the receiving cavity. The flange expansion sleeve 33 is connected to the pull plate 31 and serves as the tensioning end, sleeved on the outside of the positioning cone 2. When the tensioning bolt 32 is pulled axially, the flange expansion sleeve 33 is subjected to the abutment force of the positioning cone 2, resulting in a radial displacement. The tensioning abuts against the inside of the blind hole of the workpiece 4. The structure is simple and easy to manufacture.

[0039] In this example, the tension bolt 32 includes a screw 321 and a nut 322. The screw 321 passes through the pull plate 31 from one side, and the nut 322 is fitted onto the screw 321 and abuts against the other side of the pull plate 31.

[0040] like Figure 1 and Figure 2 As shown, in some optional embodiments, the mounting plate 1 has multiple connecting holes on the side away from the pulling end, and the flange expansion sleeve 33 has bolts 34 corresponding to the connecting holes. The bolts 34 pass through the positioning cone 2 and the connecting holes and are connected to the pulling plate 31.

[0041] In this embodiment, multiple connecting holes are provided on the side of the mounting plate 1 away from the pulling end. Bolts 34 corresponding to the connecting holes are provided on the flange expansion sleeve 33. The bolts 34 pass through the positioning cone 2 and the connecting holes and are connected to the pull plate 31 for easy connection.

[0042] In this example, multiple bolts 34 are arranged circumferentially along the pull plate 31.

[0043] like Figure 2 As shown, in some optional embodiments, the pull plate 31 includes a mounting portion 311 and protrusions 312 located on both sides of the mounting portion 311. The mounting portion 311 is connected to the tensioning bolt 32, and the protrusions 312 are connected to the bolt 34. The thickness of the protrusions 312 is less than that of the mounting portion 311. The shape of the receiving cavity matches that of the pull plate 31, and there is an axial gap between the cavity wall and the protrusions 312.

[0044] In the embodiment, the specific structure of the pull plate 31 is illustrated, the pull plate 31 comprises a mounting portion 311 and protruding portions 312 located on both sides of the mounting portion 311, the mounting portion 311 is connected with the tensioning bolt 32, the protruding portions 312 are connected with the bolt 34, the thickness of the protruding portions 312 is less than that of the mounting portion 311, the shape of the accommodating cavity is matched with the pull plate 31, and a gap exists between the cavity wall of the accommodating cavity and the protruding portions 312 in the axial direction of the tensioning bolt 32, so that the structure is simple, the cavity wall of the accommodating cavity can also play a limiting role, the movement stroke of the protruding portions 312 is limited, and the stability of the fine turning clamp for the blind hole thin-wall flange is improved.

[0045] As shown in Figure 1 and Figure 2 illustrated, in some optional embodiments, the mounting disc 1 comprises a connecting disc 11 and a mounting body 12, the connecting disc 11 is provided with a mounting hole through which the tensioning bolt 32 passes, the inner diameter of the mounting hole near one end of the pull plate 31 is matched with the outer diameter of the mounting portion 311, the mounting body 12 is internally provided with a circular truncated cone cavity, the large-diameter cavity of the circular truncated cone cavity is used for accommodating the protruding portions 312, the diameter of the small-diameter cavity of the circular truncated cone cavity is matched with the outer diameter of the mounting portion 311, and the mounting hole and the circular truncated cone cavity constitute the accommodating cavity.

[0046] In the embodiment, the specific structure of the mounting disc 1 is illustrated, the mounting disc 1 comprises a connecting disc 11 and a mounting body 12, the connecting disc 11 is provided with a mounting hole through which the tensioning bolt 32 passes, the inner diameter of the mounting hole near one end of the pull plate 31 is matched with the outer diameter of the mounting portion 311, the mounting body 12 is internally provided with a circular truncated cone cavity, the large-diameter cavity of the circular truncated cone cavity is used for accommodating the protruding portions 312, the diameter of the small-diameter cavity of the circular truncated cone cavity is matched with the outer diameter of the mounting portion 311, the mounting hole and the circular truncated cone cavity constitute the accommodating cavity, the utilization of the internal space is more reasonable, and the stability of the fine turning clamp structure for the blind hole thin-wall flange is also ensured.

[0047] In the example, the mounting hole is a stepped hole, the small-diameter section of the mounting hole is close to the pull plate 31, the use of materials is reduced, and the nut 322 can be conveniently adjusted.

[0048] As shown in Figure 2 and Figure 3 illustrated, in some optional embodiments, the flange expansion sleeve 33 comprises a connecting section 331 and an expansion section 332, the outer diameter of the connecting section 331 is greater than that of the expansion section 332, the connecting section 331 is connected with the bolt 34, the inner side of the expansion section 332 is provided with an inclined surface, the thickness of one end of the inclined surface away from the tensioning bolt 32 is greater than that of the other end, and the positioning cone 2 is matched with the inclined surface at the corresponding position on the outer side of the expansion section 332.

[0049] In the embodiment, the specific structure of the flange expansion sleeve 33 is illustrated, the flange expansion sleeve 33 comprises a connecting section 331 and an expansion section 332, wherein the outer diameter of the connecting section 331 is larger than that of the expansion section 332, the connecting section 331 is connected with the bolt 34, the inner side of the expansion section 332 is provided with a slope, the thickness of the expansion section 332 at the end far away from the tension bolt 32 is larger than that at the other end, the corresponding position of the outer side of the expansion section 332 and the slope of the positioning cone 2 are matched, the structure is simple, and the design is convenient.

[0050] In the embodiment, the expansion section 332 is composed of a plurality of expansion elastic pieces arranged circumferentially along the positioning cone 2.

[0051] As shown in Figure 1 and Figure 2 , in some optional embodiments, a support flange 5 is further included, the support flange 5 is in a stepped ring shape, is sleeved outside the positioning cone 2, the large-diameter end of the support flange 5 is arranged on the mounting disc 1, and the small-diameter end of the support flange 5 is directed away from the tension bolt 32 and is used for placing the workpiece 4.

[0052] In the embodiment, the fine turning clamp for the blind hole thin-wall flange further comprises the support flange 5, the support flange 5 is in a stepped ring shape, is sleeved outside the positioning cone 2, the large-diameter end of the support flange 5 is arranged on the mounting disc 1, the small-diameter end of the support flange 5 is directed away from the tension bolt 32 and is used for placing the workpiece 4, and the support flange 5 can also play a certain protection role on the flange expansion sleeve 33.

[0053] In the embodiment, the small-diameter end of the support flange 5 is spaced apart from the expansion section 332 by a certain distance, and the expansion section 332 is limited in a certain position.

[0054] As shown in Figure 2 , in some optional embodiments, the large-diameter end of the positioning cone 2 partially extends into the mounting disc 1, the inner diameter of the large-diameter end of the support flange 5 matches the outer diameter of the large-diameter end of the positioning cone 2, and the large-diameter end of the support flange 5 is sleeved outside the large-diameter end of the positioning cone 2.

[0055] In the embodiment, the large-diameter end of the positioning cone 2 partially extends into the mounting disc 1, the inner diameter of the large-diameter end of the support flange 5 matches the outer diameter of the large-diameter end of the positioning cone 2, and the large-diameter end of the support flange 5 is sleeved outside the large-diameter end of the positioning cone 2, the support flange 5 is conveniently installed, and the large-diameter end of the positioning cone 2 can conveniently position the support flange 5.

[0056] As shown in Figure 2 , in some optional embodiments, a through hole is arranged in the positioning cone 2 in the axial direction.

[0057] In the embodiment, the through hole is arranged in the positioning cone 2 in the axial direction, and the middle is hollowed out, so that the positioning cone 2 is more easily disassembled.

[0058] As shown inFigure 2 As shown, in some optional embodiments, the small-diameter end of the positioning cone 2 is provided with an end cover 6 for closing the outlet of the through hole away from one end of the mounting disc 1.

[0059] In this embodiment, the small-diameter end of the positioning cone 2 is provided with an end cover 6 for closing the outlet of the through hole away from one end of the mounting disc 1, thereby improving the flatness of the end of the positioning cone 2 towards the workpiece 4.

[0060] In summary, in the manufacturing of the fine turning clamp for the blind hole thin-walled flange, the mounting mechanism includes the mounting disc 1 and the positioning cone 2, the positioning cone 2 is connected with the mounting disc 1, the end of the positioning cone 2 is provided with a conical frustum for extending into the blind hole of the workpiece 4, the expansion end of the expansion mechanism 3 is arranged outside the positioning cone 2 and matches the conical frustum, and the pulling end of the expansion mechanism 3 passes through the mounting disc 1. Since the expansion end is subjected to the abutting force of the positioning cone 2 when the pulling end moves in the axial direction, the expansion end is displaced in the radial direction to be abutted against the inside of the blind hole of the workpiece 4, the workpiece 4 can be fixed, and the workpiece 4 will not be damaged during the fixing process, and the problem that the puller may hit such a blind hole workpiece when it is extended and the workpiece may be damaged is solved.

[0061] In the description of the present application, it should be noted that the positions or position relationships indicated by the terms “upper”, “lower”, etc. are based on the positions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified and limited, the terms “mounting”, “connecting”, “connecting” should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0062] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0063] The foregoing is merely illustrative of the principles of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The above embodiments are illustrative, and not restrictive, of the scope of the application.

Claims

1. A finish machining jig for a blind hole thin wall flange, characterized by, The installation mechanism comprises an installation disc (1) and a positioning cone (2), the positioning cone (2) is connected with the installation disc (1), the positioning cone (2) is provided with a frustum at the end, the frustum is used for extending into the blind hole of the workpiece (4); a pulling tensioning mechanism (3) is provided outside the positioning cone (2), the pulling tensioning mechanism (3) is matched with the frustum, the pulling end of the pulling tensioning mechanism (3) penetrates through the installation disc (1), when the pulling end moves along the axial direction, the tensioning end generates displacement along the radial direction, so as to be tightly contacted with the inside of the blind hole of the workpiece (4). The installation disc (1) is provided with a containing cavity, the pulling tensioning mechanism (3) comprises: a pulling disc (31) arranged in the containing cavity; 2. A finish machining jig for a thin-walled flange of a blind hole as set forth in claim 1, characterized in that, a tensioning bolt (32) having one end extending into the containing cavity and being connected with the pulling disc (31) and the other end being the pulling end outside the containing cavity; a flange expansion sleeve (33) connected with the pulling disc (31), the flange expansion sleeve (33) is sleeved outside the positioning cone (2) as the tensioning end, when the tensioning bolt (32) is pulled along the axial direction, the flange expansion sleeve (33) generates displacement along the radial direction. The side of the installation disc (1) away from the pulling end is provided with a plurality of communication holes, the flange expansion sleeve (33) is provided with a bolt (34) corresponding to the communication hole, the bolt (34) penetrates through the positioning cone (2) and the communication hole and is connected with the pulling disc (31). The pulling disc (31) comprises an installation part (311) connected with the tensioning bolt (32) and a protruding part (312) located on both sides of the installation part (311), the protruding part (312) is connected with the bolt (34), the thickness of the protruding part (312) is smaller than that of the installation part (311), the shape of the containing cavity is matched with that of the pulling disc (31), and there is a gap between the cavity wall of the containing cavity and the protruding part (312) along the axial direction.

3. A finish machining jig for a thin-walled flange of a blind hole as set forth in claim 2, characterized by The installation disc (1) comprises a connecting disc (11) and an installation body (12), the connecting disc (11) is provided with an installation hole through which the tensioning bolt (32) penetrates, the inner diameter of the installation hole near one end of the pulling disc (31) is matched with the outer diameter of the installation part (311), the installation body (12) is provided with a circular truncated cone cavity, the large-diameter cavity of the circular truncated cone cavity is used for containing the protruding part (312), the small-diameter cavity of the circular truncated cone cavity is matched with the outer diameter of the installation part (311), and the installation hole and the circular truncated cone cavity form the containing cavity.

4. A finish machining jig for a thin-walled flange of a blind hole as set forth in claim 3, characterized by The flange expansion sleeve (33) comprises a connecting section (331) and a tensioning section (332), the outer diameter of the connecting section (331) is greater than that of the tensioning section (332), the connecting section (331) is connected with the bolt (34), the inner side of the tensioning section (332) is provided with an inclined surface, the thickness of one end of the tensioning section (332) away from the tensioning bolt (32) is greater than that of the other end, and the corresponding position of the outer side of the tensioning section (332) of the positioning cone (2) is matched with the inclined surface.

5. A finish machining jig for a thin-walled flange of a blind hole as set forth in claim 4, characterized by ​ 6. A finish machining jig for a thin-walled flange of a blind hole as set forth in claim 3, characterized by ​ 7. A finish machining jig for a thin-walled flange of a blind hole as set forth in claim 6, characterized by Also included is a support flange (5) in the shape of a stepped ring, which is sleeved outside the positioning cone (2), the large-diameter end of the support flange (5) is arranged on the mounting disc (1), and the small-diameter end of the support flange (5) is directed away from the tension bolt (32) for placing the workpiece (4).

8. A finish machining jig for a thin-walled flange of a blind hole according to claim 7, wherein The large-diameter end of the positioning cone (2) partially extends into the mounting disc (1), the inner diameter of the large-diameter end of the support flange (5) matches the outer diameter of the large-diameter end of the positioning cone (2), and the large-diameter end of the support flange (5) is sleeved outside the large-diameter end of the positioning cone (2).

9. A finish machining jig for a thin-walled flange of a blind hole as set forth in claim 1, characterized by The positioning cone (2) is provided with a through hole arranged in the axial direction.

10. A finish machining jig for a thin-walled flange of a blind hole as set forth in claim 9, characterized by The small-diameter end of the positioning cone (2) is provided with an end cover (6) for closing the outlet of the through hole away from the mounting disc (1).

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