Precise milling clamp for crescent groove in sphere

Abstract

The utility model discloses a sphere crescent groove milling precision fixture relates to metal part processing technical field, including fixed seat and self-centering subassembly, the bottom of fixed seat is equipped with the mounting hole, and the top of fixed seat is connected with the limit table, the top of limit table is fixed with the limit post, and the top of limit post is connected with the screw rod, and the screw rod is connected with the self-centering subassembly. The self-centering assembly is arranged on the outer side of the limiting column and comprises a self-centering expansion sleeve, an inner conical surface, a cutting groove, an expansion core and a first nut. According to the precise clamp for milling the crescent groove in the sphere, through the arrangement of the self-centering assembly, after the fixing base is installed on a machining center table top through a bolt and an installation hole, a limiting column can be sleeved with a self-centering expansion sleeve, then a sphere workpiece is placed on the outer side of the self-centering expansion sleeve, and a first nut is tightened; at the moment, the expansion core and the limiting table can extrude the inner conical surfaces on the upper side and the lower side of the self-centering expansion sleeve, so that the self-centering expansion sleeve deforms under extrusion, and the inner hole of the expansion ball is expanded.

Description

Technical Field

[0001] The utility model relates to the technical field of metal parts processing, in particular to a precision fixture for milling crescent grooves on a sphere. Background Art

[0002] Metal parts refer to metal blocks, metal rods, metal tubes, etc. of various specifications and shapes made of metal materials. When milling crescent grooves on metal spheres, a fixture is needed to fix the spherical workpiece.

[0003] For example, the utility model with publication number CN212600877U discloses a sphere grinding fixture. This utility model is provided with a sliding seat, a fixed plate, and a clamping mechanism. The sliding seat can adjust the distance between the two sliding seats so that the fixture can be used for spheres of various sizes. The clamping mechanism can move up and down, so that the clamping mechanism can be adjusted according to the size of the sphere to clamp the sphere. This effectively achieves the clamping of the sphere and can be adjusted according to the size of the sphere, with a wide range of applications. However, when this type of fixture is used to fix a spherical workpiece, it is not convenient to quickly center the workpiece, which affects the processing accuracy when the subsequent machining center processes the workpiece.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a precision fixture for milling crescent grooves on a sphere is provided. Utility Model Content

[0005] The purpose of the utility model is to provide a precision fixture for milling crescent grooves on a sphere, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a precision fixture for milling crescent grooves on a sphere, comprising a fixed seat and a self-centering component, the bottom of the fixed seat is provided with a mounting hole, and the top of the fixed seat is connected to a limiting platform, the top of the limiting platform is fixed with a limiting column, and the top of the limiting column is connected with a screw, the self-centering component is arranged on the outside of the limiting column, the self-centering component comprises a self-centering expansion sleeve, an inner conical surface, a cutting groove, an expansion core and a first nut, the middle parts of the upper and lower sides of the self-centering expansion sleeve are provided with inner conical surfaces, and the upper and lower sides of the self-centering expansion sleeve are provided with cutting grooves, the top of the self-centering expansion sleeve is provided with an expansion core, and the top of the expansion core is connected to the first nut.

[0007] Furthermore, the diameter of the limiting column is equal to the inner diameter of the middle part of the self-centering expansion sleeve, and the self-centering expansion sleeve is slidably connected to the limiting platform.

[0008] Furthermore, the cutting grooves are equidistantly distributed on both sides of the self-centering expansion sleeve, and the cutting grooves on the upper and lower surfaces are staggered.

[0009] Furthermore, the expansion core is in a truncated cone shape, and the outer shape of the expansion core is the same as the outer shape of the limiting platform.

[0010] Furthermore, the expansion core is slidably connected to the screw, and the screw is threadedly connected to the first nut.

[0011] Furthermore, a positioning assembly is provided on the outer side of the fixing seat and the outer side of the screw, and the positioning assembly includes a base and a circular pressure plate. The outer side of the fixing seat is sleeved with the base, and the outer side of the upper end of the screw is slidably connected with a circular pressure plate.

[0012] Furthermore, the positioning assembly also includes a second nut and an anti-slip rubber pad. The top of the circular pressure plate is connected to the second nut, and the bottom of the circular pressure plate is provided with an anti-slip rubber pad.

[0013] Furthermore, the size of the second nut is equal to that of the first nut, and the second nut is threadedly connected to the screw.

[0014] The utility model provides a precision fixture for milling crescent grooves on a sphere, which has the following beneficial effects:

[0015] 1. The utility model adopts the setting of the self-centering component. After the fixing seat is installed on the machining center table by using bolts and mounting holes, the self-centering expansion sleeve can be put on the outside of the limit column. Then, after the spherical workpiece is placed on the outside of the self-centering expansion sleeve, the first nut is tightened. At this time, the expansion core and the limit table can squeeze the inner conical surfaces on the upper and lower sides of the self-centering expansion sleeve, causing the self-centering expansion sleeve to deform under the squeezing, thereby expanding the inner hole of the expansion ball. The cutting grooves on the self-centering expansion sleeve are equidistantly distributed around the circumference, so that the inner hole wall of the ball is evenly stressed, and the spherical workpiece can be quickly centered, which is beneficial to improving the accuracy of subsequent milling processing.

[0016] 2. The utility model sets a positioning component. Before placing the sphere, the base is first put on the outside of the fixing seat. There is no need to fix the base. When the sphere is placed, the bottom of the sphere can be supported. After the spherical workpiece is centered, the circular pressure plate can be covered and the second nut can be tightened. The circular pressure plate can be used to reinforce the sphere again, and the friction force during clamping can be increased by the anti-slip rubber pad, thereby further improving the stability of the spherical workpiece during processing, which is beneficial to improving the subsequent processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a precision fixture for milling crescent grooves on a sphere according to the present invention;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the base of a precision fixture for milling crescent grooves on a sphere according to the present invention;

[0019] Figure 3The utility model is a schematic diagram of the three-dimensional structure of a self-centering expansion sleeve of a precision fixture for milling crescent grooves on a sphere.

[0020] In the figure: 1. Fixed seat; 2. Mounting hole; 3. Limit platform; 4. Limit column; 5. Screw; 6. Self-centering assembly; 601. Self-centering expansion sleeve; 602. Inner cone; 603. Cutting groove; 604. Expansion core; 605. First nut; 7. Positioning assembly; 701. Base; 702. Circular pressure plate; 703. Second nut; 704. Anti-slip rubber pad. DETAILED DESCRIPTION

[0021] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] like Figures 1 to 3 As shown, a precision fixture for milling crescent grooves on a sphere includes a fixed seat 1 and a self-centering component 6. The bottom of the fixed seat 1 is provided with a mounting hole 2, and the top of the fixed seat 1 is connected to a limit table 3. The fixed seat 1 is mounted on the table of a machining center using bolts and the mounting hole 2. The top of the limit table 3 is fixed with a limit column 4, and the top of the limit column 4 is connected with a screw 5. The self-centering component 6 is arranged on the outside of the limit column 4. The self-centering component 6 includes a self-centering expansion sleeve 60. 1. Inner conical surface 602, cutting groove 603, expansion core 604 and first nut 605. The middle parts of the upper and lower sides of the self-centering expansion sleeve 601 are provided with inner conical surfaces 602, and cutting grooves 603 are opened on the upper and lower sides of the self-centering expansion sleeve 601. The diameter of the limiting column 4 is equal to the inner diameter of the middle part of the self-centering expansion sleeve 601, and the self-centering expansion sleeve 601 is slidably connected to the limiting platform 3. The self-centering expansion sleeve 601 will deform under extrusion, thereby expanding the inner hole of the expansion ball. The cutting grooves 603 are distributed equidistantly on both sides of the self-centering expansion sleeve 601, and the cutting grooves 603 on the upper and lower surfaces are staggered. Since the cutting grooves 603 on the self-centering expansion sleeve 601 are distributed equidistantly on the circumference, the force on the inner hole wall of the sphere is uniform, and the spherical workpiece can be quickly centered, which is beneficial to improving the subsequent milling processing accuracy. An expansion core 604 is provided on the top of the self-centering expansion sleeve 601, and the top of the expansion core 604 is connected to a first nut. 605, the expanding core 604 is in the shape of a truncated cone, and the outer shape of the expanding core 604 is the same as the outer shape of the limiting platform 3. The expanding core 604 and the limiting platform 3 can squeeze the self-centering expanding sleeve 601, causing it to deform. The expanding core 604 is slidably connected to the screw rod 5, and the screw rod 5 is threadedly connected to the first nut 605. Tightening the first nut 605 on the screw rod 5 can make the expanding core 604 and the limiting platform 3 squeeze the inner conical surfaces 602 on the upper and lower sides of the self-centering expanding sleeve 601.

[0023] like Figure 1As shown, a positioning assembly 7 is provided on the outer side of the fixing seat 1 and the outer side of the screw 5. The positioning assembly 7 includes a base 701 and a circular pressure plate 702. The outer side of the fixing seat 1 is sleeved with the base 701, and the outer side of the upper end of the screw 5 is slidably connected to the circular pressure plate 702. When the sphere is placed, the base 701 can support the bottom of the sphere. The positioning assembly 7 also includes a second nut 703 and an anti-slip rubber pad 704. The top of the circular pressure plate 702 is connected to the second nut 703, and the bottom of the circular pressure plate 702 is provided with an anti-slip rubber pad 704. The anti-slip rubber pad 704 increases the friction force during clamping. The size of the second nut 703 is equal to that of the first nut 605, and the second nut 703 is threadedly connected to the screw 5. By tightening the second nut 703, the circular pressure plate 702 can be used to reinforce the spherical workpiece again, thereby further improving the stability of the spherical workpiece during processing.

[0024] In summary, when using the crescent groove milling precision fixture on the sphere, first Figure 1 、 Figure 2 and Figure 3 4, and the second nut 703 is tightened, so that the circular pressure plate 702 can be used to reinforce the spherical workpiece again, and the friction force during clamping can be increased by the anti-slip rubber pad 704, thereby further improving the stability of the spherical workpiece during machining.

[0025] The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

Claims

1. A precision fixture for milling crescent grooves on a sphere, comprising a fixed seat (1) and a self-centering component (6), characterized in that: The bottom of the fixing seat (1) is provided with a mounting hole (2), and the top of the fixing seat (1) is connected to a limiting platform (3), the top of the limiting platform (3) is fixed with a limiting column (4), and the top of the limiting column (4) is connected with a screw (5), and the self-centering component (6) is arranged on the outside of the limiting column (4), and the self-centering component (6) comprises a self-centering expansion sleeve (601), an inner conical surface (602), a cutting groove (603), an expansion core (604) and a first nut (605), the middle parts of the upper and lower sides of the self-centering expansion sleeve (601) are provided with inner conical surfaces (602), and the upper and lower sides of the self-centering expansion sleeve (601) are provided with cutting grooves (603), the top of the self-centering expansion sleeve (601) is provided with an expansion core (604), and the top of the expansion core (604) is connected with the first nut (605).

2. A precision fixture for milling crescent grooves on a sphere according to claim 1, characterized in that: The diameter of the limiting column (4) is equal to the inner diameter of the middle portion of the self-centering expansion sleeve (601), and the self-centering expansion sleeve (601) is slidably connected to the limiting platform (3).

3. A precision fixture for milling crescent grooves on a sphere according to claim 1, characterized in that: The cutting grooves (603) are distributed equidistantly on both sides of the self-centering expansion sleeve (601), and the cutting grooves (603) on the upper and lower surfaces are staggered.

4. A precision fixture for milling crescent grooves on a sphere according to claim 1, characterized in that: The expansion core (604) is in the shape of a truncated cone, and the outer shape of the expansion core (604) is the same as the outer shape of the limiting platform (3).

5. The precision fixture for milling crescent grooves on a sphere according to claim 1, characterized in that: The expansion core (604) is slidably connected to the screw rod (5), and the screw rod (5) is threadedly connected to the first nut (605).

6. A precision fixture for milling crescent grooves on a sphere according to claim 1, characterized in that: A positioning assembly (7) is provided on the outer side of the fixing seat (1) and the outer side of the screw rod (5), and the positioning assembly (7) comprises a base (701) and a circular pressure plate (702). The outer side of the fixing seat (1) is sleeved with the base (701), and the outer side of the upper end of the screw rod (5) is slidably connected with the circular pressure plate (702).

7. A precision fixture for milling crescent grooves on a sphere according to claim 6, characterized in that: The positioning assembly (7) further comprises a second nut (703) and an anti-slip rubber pad (704); the top of the circular pressure plate (702) is connected to the second nut (703), and the bottom of the circular pressure plate (702) is provided with an anti-slip rubber pad (704).

8. A precision fixture for milling crescent grooves on a sphere according to claim 7, characterized in that: The size of the second nut (703) is equal to that of the first nut (605), and the second nut (703) is threadedly connected to the screw rod (5).

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