Large-size thin-wall workpiece machining tool clamp

Abstract

A large-size thin-wall workpiece machining tool clamp relates to the technical field of tool clamps and comprises a mandrel base, a supporting wheel, a gland, a gland nut and a supporting wheel nut. A connecting shaft used for being connected with a machine tool rotating table is arranged at the lower end of the mandrel base, the mandrel base is of a step shaft structure and comprises a supporting cylinder used for coaxially supporting the inner wall of a thin-wall workpiece and a supporting step face used for axially positioning the thin-wall workpiece, and a mandrel is arranged at the top of the mandrel base. A shaft body at the top of the mandrel is coaxially and detachably connected with a supporting wheel used for coaxially supporting the inner wall of the thin-wall workpiece, and a gland used for axially pressing the thin-wall workpiece is installed at the position, corresponding to the upper portion of the supporting wheel, of the mandrel. The device is simple in structure, easy to assemble, low in manufacturing difficulty and convenient to use and operate; machining of the outer circle face, the mounting edge and the mounting hole of the thin-wall workpiece can be achieved through one-time clamping, the clamping frequency is reduced, the machining efficiency is improved, and the machining quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of tooling fixtures, in particular to a tooling fixture for processing large-size thin-walled workpieces. Background Art

[0002] As is known, thin-walled workpieces are prone to deformation during machining and clamping due to their poor rigidity. This problem is more obvious on large-sized thin-walled workpieces. Therefore, it is necessary to design a fixture that can not only meet the positioning and clamping requirements of the workpiece, but also prevent the large-sized thin-walled workpiece from deforming.

[0003] A Chinese patent (publication number: CN219026697U) discloses a tooling fixture for processing multiple holes in a thin-walled shell; the patent consists of a mandrel base, a pressure cover and bolts, and the mandrel base is connected to the pressure cover by bolts to achieve workpiece clamping; however, the above-mentioned tooling fixture has shortcomings when applied to large-sized thin-walled workpieces with mounting edges. In the above scheme, the bolts and the pressure cover are connected through an axial groove hole, and the coaxiality of the pressure cover and the bolts is difficult to control. For large-sized thin-walled workpieces with high-precision requirements, an increase in the bolt length will also cause the coaxiality of the mandrel base and the pressure cover to decrease, ultimately causing the coaxiality of both ends of the workpiece to decrease; the above-mentioned defects are problems that need to be urgently solved by technical personnel in this field. Utility Model Content

[0004] In order to overcome the deficiencies in the background technology, the utility model discloses a tooling fixture for processing large-size thin-walled workpieces.

[0005] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solutions:

[0006] A large-size thin-walled workpiece processing tooling fixture is used for clamping and positioning thin-walled workpieces, comprising a core shaft base, a supporting wheel, a pressure cover, a pressure cover nut and a positioning nut; the lower end of the core shaft base is provided with a connecting shaft for connecting to a rotary table of a machine tool, the core shaft base is a stepped shaft structure, comprising a supporting cylinder for coaxially supporting the inner wall of the thin-walled workpiece and a supporting step surface for axially positioning the thin-walled workpiece, a core shaft is provided on the top of the core shaft base, and the top shaft body of the core shaft is coaxially and detachably connected with a supporting wheel for coaxially supporting the inner wall of the thin-walled workpiece, and a pressure cover for axially pressing the thin-walled workpiece is installed above the core shaft corresponding to the support wheel.

[0007] Preferably, a conical structure is provided at the position of the core shaft corresponding to the support wheel, a conical hole corresponding to the conical structure is provided at the center position of the support wheel, and the upper end surface of the conical hole is higher than the upper end surface of the conical structure, and the core shaft body is threadedly connected with a positioning nut for tightening the support wheel.

[0008] Preferably, the top shaft body of the core shaft is provided with an external thread, the center position of the gland is provided with a through hole that allows the external thread section of the core shaft to movably pass through, and the external thread section of the core shaft is threadedly connected with a gland nut for tightening the gland.

[0009] Preferably, a mounting plane is provided at the bottom of the mandrel base, and a connecting shaft backing groove is provided at a connection position corresponding to the mounting plane and the connecting shaft.

[0010] Preferably, a support surface backing groove is provided at a corresponding connection position between the support cylinder and the support step surface.

[0011] Preferably, the support wheel is provided with a plurality of support wheel weight-reducing holes, and the gland cover body is provided with a plurality of gland weight-reducing holes.

[0012] Preferably, the diameter of the gland is larger than the inner diameter of the thin-walled workpiece and smaller than the outer diameter of the thin-walled workpiece.

[0013] Preferably, the upper end of the supporting cylinder and the lower end of the outer circle of the supporting wheel are both provided with chamfered structures.

[0014] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0015] The utility model discloses a large-size thin-wall workpiece processing fixture, which has a simple structure, is easy to assemble, has low manufacturing difficulty and is convenient to use and operate; a tapered structure is provided at the position of the core shaft corresponding to the support wheel, and a tapered hole corresponding to the tapered structure is provided at the center position of the support wheel, which can effectively ensure that the support wheel and the core shaft are coaxial, so that the coaxial accuracy between the core shaft base and the support wheel is high, the coaxial accuracy between the thin-walled workpiece and the machine tool worktable is high, and the workpiece processing accuracy is also high; one-time clamping can realize the processing of the outer cylindrical surface, mounting edge and mounting hole of the thin-walled workpiece, reduce the number of clamping times, both improve the processing efficiency and ensure the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a cross-sectional view of the mandrel base;

[0018] Figure 3 It is a schematic diagram of the support wheel structure;

[0019] Figure 4 It is a schematic diagram of the structure of the gland;

[0020] Figure 5 Schematic diagram of the structure of a thin-walled workpiece.

[0021] In the figure: 1. spindle base; 11. connecting shaft; 111. connecting shaft undercut; 12. mounting plane; 13. supporting cylinder; 131. supporting step surface; 132. supporting surface undercut; 14. conical structure; 2. supporting wheel; 21. conical hole; 22. supporting wheel weight-reducing hole; 3. gland; 31. through hole; 32 gland weight-reducing hole; 4. gland nut; 5. positioning nut; 6. thin-walled workpiece. DETAILED DESCRIPTION

[0022] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0023] Embodiment 1, in combination with Figures 1 to 5 A large-size thin-walled workpiece processing fixture is used to clamp and position a thin-walled workpiece 6, comprising a spindle base 1, a supporting wheel 2, a gland 3, a gland nut 4 and a positioning nut 5; the lower end of the spindle base 1 is provided with a connecting shaft 11 for connecting to a rotary table of a machine tool, and the spindle base 1 is a stepped shaft structure, which comprises a supporting cylinder 13 for coaxially supporting the inner wall of the thin-walled workpiece 6 and a supporting step surface 131 for axially positioning the thin-walled workpiece 6, that is, one end of the thin-walled workpiece 6 can be sleeved on the column body of the supporting cylinder 13, and the thin-walled workpiece 6 is supported and positioned by the supporting step surface 131;

[0024] A mandrel is provided on the top of the mandrel base 1, and a support wheel 2 for coaxially supporting the inner wall of a thin-walled workpiece 6 is detachably connected to the top shaft of the mandrel, and a pressure cover 3 for axially pressing the thin-walled workpiece 6 is installed above the mandrel corresponding to the support wheel 2;

[0025] When in use, first install the mandrel base 1 on the machine tool workbench, and use the connecting shaft 11 and the bottom end face of the mandrel base 1 to perform radial positioning and axial positioning; then put the thin-walled workpiece 6 from top to bottom on the outside of the supporting cylinder 13 of the mandrel base 1, and make the lower end face of the thin-walled workpiece 6 fit with the supporting step surface 131 of the mandrel base 1, so as to achieve radial positioning and axial positioning of the thin-walled workpiece 6; then install the supporting wheel 2 into the upper end hole of the thin-walled workpiece 6 from top to bottom, and use the supporting wheel 2 to guide the thin-walled workpiece 6 to avoid shaking of the thin-walled workpiece 6 during processing; finally, install the pressure cover 3 on the mandrel shaft body, make the pressure cover 3 fit with the upper end face of the thin-walled workpiece 6, and press the thin-walled workpiece 6, so as to complete the clamping and positioning of the thin-walled workpiece 6.

[0026] Embodiment 2, in combination with Figures 1 to 5, a large-size thin-walled workpiece processing fixture, which is different from Example 1 in that, on the basis of Example 1, a tapered structure 14 is provided at the position of the core shaft corresponding to the support wheel 2, and a tapered hole 21 corresponding to the tapered structure 14 is provided at the center position of the support wheel 2, which can effectively ensure that the support wheel 2 and the core shaft are coaxial; the core shaft body is threadedly connected with a positioning nut 5 for pressing the support wheel 2, and the upper end surface of the tapered hole 21 is higher than the upper end surface of the tapered structure 14, which can ensure that the positioning nut 5 presses the support wheel 2, thereby firmly positioning the support wheel 2; the top shaft body of the core shaft is provided with an external thread, and a through hole 31 is provided at the center position of the pressure cover 3, which can allow the external thread section of the core shaft to movably pass through, and the external thread section of the core shaft is threadedly connected with a pressure cover nut 4 for pressing the pressure cover 3, and the pressure cover 3 is easy and quick to install.

[0027] Embodiment 3, in combination with Figures 1 to 5 , a large-size thin-wall workpiece processing fixture, based on embodiment 1 or 2, the bottom of the mandrel base 1 is provided with a mounting plane 12, the mounting plane 12 and the connecting shaft 11 are perpendicular to each other, when the mandrel base 1 is connected to the machine tool worktable, the connecting shaft 11 radially positions the mandrel base 1, and the mounting plane 12 axially positions the mandrel base 1;

[0028] A connecting shaft undercut 111 is provided at the corresponding connecting position between the mounting plane 12 and the connecting shaft 11, which effectively avoids interference between the corner and the machine tool worktable; a supporting surface undercut 132 is provided at the corresponding connecting position between the supporting cylinder 13 and the supporting step surface 131, which can avoid interference between the thin-walled workpiece 6 and the corner between the supporting cylinder 13 and the supporting step surface 131;

[0029] The support wheel 2 is provided with a plurality of support wheel weight-reducing holes 22, and the cover body of the pressure cover 3 is provided with a plurality of pressure cover weight-reducing holes 32, which can effectively reduce the overall weight and facilitate handling, and can save materials and reduce costs at the same time; the diameter of the pressure cover 3 is larger than the inner diameter of the thin-walled workpiece 6 and smaller than the outer diameter of the thin-walled workpiece 6, ensuring that the pressure cover 3 can both clamp the workpiece 6 and not interfere with the machine tool tool, and one clamping can realize the processing of multiple parts such as the outer cylindrical surface, mounting edge and mounting hole of the thin-walled workpiece, reducing the number of clamping times, which not only improves the processing efficiency but also ensures the processing quality; the upper end of the support cylinder 13 and the lower end of the outer circle of the support wheel 2 are both provided with chamfering structures to facilitate the assembly of the thin-walled workpiece 6 and the support cylinder 13, as well as the assembly of the support wheel 2 in the thin-walled workpiece 6.

[0030] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A large-size thin-walled workpiece processing fixture, used for clamping and positioning thin-walled workpieces (6), characterized by: The invention comprises a mandrel base (1), a supporting wheel (2), a pressure cover (3), a pressure cover nut (4) and a positioning nut (5); a connecting shaft (11) for connecting to a rotary table of a machine tool is provided at the lower end of the mandrel base (1); the mandrel base (1) is in a stepped shaft structure, comprising a supporting cylinder (13) for coaxially supporting the inner wall of a thin-walled workpiece (6) and a supporting stepped surface (131) for axially positioning the thin-walled workpiece (6); a mandrel is provided at the top of the mandrel base (1); a supporting wheel (2) for coaxially supporting the inner wall of the thin-walled workpiece (6) is coaxially detachably connected to the top shaft body of the mandrel; and a pressure cover (3) for axially pressing the thin-walled workpiece (6) is installed above the mandrel corresponding to the supporting wheel (2).

2. The large-size thin-wall workpiece processing fixture as claimed in claim 1 is characterized in that: A conical structure (14) is provided at a position of the core shaft corresponding to the support wheel (2); a conical hole (21) corresponding to and matching the conical structure (14) is provided at the center of the support wheel (2); an upper end surface of the conical hole (21) is higher than an upper end surface of the conical structure (14); and a positioning nut (5) for pressing the support wheel (2) is threadedly connected to the core shaft body.

3. The large-size thin-wall workpiece processing fixture as claimed in claim 1 is characterized in that: The shaft body at the top of the mandrel is provided with an external thread, and the center of the gland (3) is provided with a through hole (31) through which the external thread section of the mandrel can movably pass, and the external thread section of the mandrel is threadedly connected with a gland nut (4) for tightening the gland (3).

4. The large-size thin-wall workpiece processing fixture as claimed in claim 1 is characterized in that: The bottom of the spindle base (1) is provided with a mounting plane (12), and a connecting shaft backing groove (111) is provided at a corresponding connection position between the mounting plane (12) and the connecting shaft (11).

5. The large-size thin-wall workpiece processing fixture as claimed in claim 1 is characterized in that: A support surface backing groove (132) is provided at a corresponding connection position between the support cylinder (13) and the support step surface (131).

6. The large-size thin-wall workpiece processing fixture as claimed in claim 1 is characterized by: The support wheel (2) is provided with a plurality of support wheel weight reduction holes (22), and the cover body of the pressure cover (3) is provided with a plurality of pressure cover weight reduction holes (32).

7. The large-size thin-wall workpiece processing fixture as claimed in claim 1 is characterized by: The diameter of the gland (3) is larger than the inner diameter of the thin-walled workpiece (6) and smaller than the outer diameter of the thin-walled workpiece (6).

8. The large-size thin-wall workpiece processing fixture as claimed in claim 1 is characterized by: The upper end of the supporting cylinder (13) and the lower end of the outer circle of the supporting wheel (2) are both provided with chamfered structures.

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