Chuck for polishing a hole of a workpiece

Abstract

A workpiece hole polishing chuck, including a disc, the upper end face of the disc is shaped with an upper extension table, the lower end face of the disc is shaped with a circular table, a pair of parallel planes are formed on the upper extension table, a limiting groove is opened on the upper extension table, the groove bottom of the limiting groove is coplanar with the upper end face of the disc, a middle hole is opened through the bottom of the limiting groove, a pair of first screws are fixed on one of the planes of the upper extension table through threads, a top strip is sleeved on the first screw, a first end plate is formed on the inner side of the top strip, the first end plate is inserted into one end of the limiting groove, a pair of second screws are fixed on the other plane of the upper extension table through threads, a limiting strip is sleeved on the second screw, a second end plate is formed on the inner side of the limiting strip, and the second end plate is inserted into the other end of the limiting groove. The precision during workpiece machining is improved.

Description

Technical Field

[0001] This utility model relates to the field of cemented carbide processing technology, and in particular to a chuck for grinding workpiece holes. Background Technology

[0002] like Figure 5 This diagram shows the structure of a cemented carbide workpiece. The workpiece consists of a rectangular body 1, with a first inclined wall 11 at one end and a second inclined wall 10 at the other end. A through hole 12 is formed on the body 1, located on the centerline of the width direction of the body 1. Furthermore, the distance of the through hole 12 from both ends of the body 1 is subject to strict requirements. Because this workpiece is made of cemented carbide, it cannot be machined using a high-precision machining center and must be ground. However, the strict requirements for the through hole 12 increase the difficulty of machining it. Utility Model Content

[0003] This utility model provides a chuck for grinding workpiece holes, which solves the shortcomings of the prior art and addresses the problems of high difficulty and low precision in machining cemented carbide parts, and has strong practicality.

[0004] In order to achieve the purpose of this utility model, the following technology is proposed to be adopted: A chuck for grinding workpiece holes includes a disc, an upper extension platform formed on the upper end face of the disc, a frustum formed on the lower end face of the disc, a pair of parallel planes formed on the upper extension platform, a limiting groove formed on the upper extension platform, the bottom of the limiting groove being coplanar with the upper end face of the disc, and a central hole being formed through the bottom of the limiting groove, the central hole being coaxial with the disc. A pair of first screws are fixed to one of the planes of the upper extension platform by threads. A top strip is fitted on the first screw, and a first end plate is formed on the inner side of the top strip. The first end plate passes through one end of the limiting groove. On another plane of the upper extension platform, a pair of second screws are fixed by threads. A limiting strip is fitted on the second screws. A second end plate is formed on the inner side of the limiting strip. The second end plate passes through the other end of the limiting groove.

[0005] Furthermore, the inner end face of the first end plate is a first inclined surface.

[0006] Furthermore, the inner end face of the second end plate is a second inclined surface.

[0007] Furthermore, symmetrical movable slots are provided on the upper extension platform. The inner end of the movable slot is open. Limiting protrusions are formed on the inner ends of the opposite sides of the movable slot. Movable horizontal plates are movably provided in the movable slots. Inner top blocks are formed vertically on the inner side of the movable horizontal plates. The inner top blocks move between the limiting protrusions. A slot is formed at one end of the movable horizontal plate. The bottom of the slot is a sloping wall. Inner insert plates are symmetrically formed on the second end plate. Movable holes are provided on one side of the movable slot. The inner insert plates move in the movable holes. An action slope is formed on the inner end of the inner insert plates. The action slope abuts against the sloping wall. When the inner insert plates move inward, the inner top blocks move closer to each other.

[0008] Furthermore, the inner top block has symmetrically formed lower plates on both sides. The lower plates move below the limiting protrusion. The lower plates have strip holes, and a limiting pin passes through the strip holes. The upper end of the limiting pin is fixed to the limiting protrusion, and the lower end of the limiting pin is fixed to the bottom of the movable groove.

[0009] Furthermore, the bottom of the limiting groove has multiple arc-shaped grooves, with both ends of the arc-shaped grooves extending outwards from the circumference of the disc.

[0010] The advantages of the above technical solution are: This utility model uses the limiting strip and its second end plate, as well as the top strip and its first end plate, to limit the two ends of the workpiece. Specifically, during the limiting process, the second inclined surface on the second end plate abuts against the second inclined wall, and the first inclined surface on the first end plate abuts against the first inclined wall. In this way, the length direction of the workpiece can be limited and constrained, and with the help of the two inclined surfaces, the width direction of the workpiece can also be constrained.

[0011] When the second end plate is used for limiting and constraining, the second end plate can also be moved to make the inner insert plate act on the slot, thereby moving the inner top block inward and making the inner end of the inner top block abut against both sides of the workpiece. Moreover, this movement is synchronous and the same distance, which can ensure that the through hole and the middle hole are completely overlapped, thereby improving the processing accuracy of the through hole. Attached Figure Description

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will provide a further detailed description of this utility model in conjunction with the accompanying drawings.

[0013] Figure 1 A three-dimensional structural diagram of one embodiment is shown.

[0014] Figure 2 A three-dimensional structural diagram of the disk is shown.

[0015] Figure 3 A three-dimensional structural diagram of the inner top block is shown.

[0016] Figure 4 A three-dimensional structural diagram of the first end plate and the second end plate is shown.

[0017] Figure 5 A three-dimensional structural diagram of the workpiece is shown. Detailed Implementation

[0018] like Figures 1-5 As shown, a chuck for grinding workpiece holes includes a disc 2. The upper end face of the disc 2 is formed with an upper extension platform 22, and the lower end face of the disc 2 is formed with a frustum 20. A pair of parallel planes are formed on the upper extension platform 22. A limiting groove 270 is formed on the upper extension platform 22. The bottom of the limiting groove 270 is coplanar with the upper end face of the disc 2. A central hole 21 is formed through the bottom of the limiting groove 270. The central hole 21 is coaxial with the disc 2. Multiple arc-shaped grooves 200 are formed at the bottom of the limiting groove 270. The two ends of the arc-shaped grooves 200 extend out of the periphery of the disc 2.

[0019] A pair of first screws 35 are fixed to one of the planes of the upper extension platform 22 by threads. A top bar 33 is sleeved on the first screws 35. A first end plate 34 is formed on the inner side of the top bar 33. The first end plate 34 passes through one end of the limiting groove 270. The inner end face of the first end plate 34 is a first inclined surface.

[0020] On another plane of the upper extension platform 22, a pair of second screws 37 are fixed by threads. A limiting strip 36 is fitted on the second screws 37. A second end plate 38 is formed on the inner side of the limiting strip 36. The second end plate 38 passes through the other end of the limiting groove 270. The inner end face of the second end plate 38 is a second inclined surface.

[0021] The upper extension platform 22 is symmetrically provided with movable grooves 23. The inner end of the movable groove 23 is open. The inner ends of the opposite sides of the movable groove 23 are formed with limiting protrusions 24. The movable horizontal plate 28 is movably provided in the movable groove 23. The inner side of the movable horizontal plate 28 is vertically formed with inner top blocks 27. The inner top blocks 27 move between the limiting protrusions 24. One end of the movable horizontal plate 28 is formed with a slot 29. The bottom of the slot 29 is a sloping wall. The second end plate 38 is symmetrically formed with inner insert plates 39. The movable groove 23 is provided with a movable hole 25. The inner insert plates 39 move in the movable hole 25. The inner end of the inner insert plates 39 is formed with an action slope. The action slope abuts against the sloping wall. When the inner insert plates 39 move inward, the inner top blocks 27 move closer to each other. The inner top block 27 has a lower plate 30 symmetrically formed on both sides. The lower plate 30 moves below the limiting protrusion 24. A strip hole 31 is provided on the lower plate 30. A limiting pin 32 passes through the strip hole 31. The upper end of the limiting pin 32 is fixed to the limiting protrusion 24, and the lower end of the limiting pin 32 is fixed to the bottom of the movable groove 23.

[0022] In this embodiment, when the operator places the workpiece in the limiting groove 270, the second inclined wall 10 is placed towards the end of the movable hole 25.

[0023] The operator then uses the first screw 35 to fix the top bar 33 onto the upper extension platform 22.

[0024] Next, the operator fixes the limiting strip 36 to the upper extension table 22 using the second screw 37. During the fixing process, the second end plate 38 abuts against the second inclined wall 10, thereby moving the workpiece as a whole to the other end. The first inclined surface of the first end plate 34 acts on the other end of the workpiece. When the second end plate 38 moves, it can also drive the inner insert plate 39 to move inward, and the inclined surface of the inner insert plate 39 abuts against the inclined wall, thereby abutting the inner end of the inner top block 27 against both sides of the workpiece. In this way, all four side walls of the workpiece are constrained to ensure that the through hole 12 and the middle hole 21 are coaxial.

[0025] Finally, the frustum 20 is clamped and fixed by the jaws on the grinding machine, and then the through hole 12 is machined on the workpiece.

[0026] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A chuck for grinding holes in a workpiece, characterized in that, Includes a disc (2), the upper end face of the disc (2) is formed with an upper extension platform (22), the lower end face of the disc (2) is formed with a frustum (20), the upper extension platform (22) is formed with a pair of parallel planes, a limiting groove (270) is provided on the upper extension platform (22), the bottom of the limiting groove (270) is coplanar with the upper end face of the disc (2), and a central hole (21) is provided through the bottom of the limiting groove (270), the central hole (21) is coaxial with the disc (2); A pair of first screws (35) are fixed to one of the planes of the upper extension platform (22) by threads. A top strip (33) is fitted on the first screws (35). A first end plate (34) is formed on the inner side of the top strip (33). The first end plate (34) passes through one end of the limiting groove (270). On another plane of the upper extension platform (22), a pair of second screws (37) are fixed by threads. A limiting strip (36) is fitted on the second screws (37). A second end plate (38) is formed on the inner side of the limiting strip (36). The second end plate (38) passes through the other end of the limiting groove (270).

2. The chuck for grinding workpiece holes according to claim 1, characterized in that, The inner end face of the first end plate (34) is the first inclined surface.

3. The chuck for grinding workpiece holes according to claim 1, characterized in that, The inner end face of the second end plate (38) is the second inclined surface.

4. The chuck for grinding workpiece holes according to claim 1, characterized in that, The upper extension platform (22) is symmetrically provided with movable grooves (23). The inner end of the movable groove (23) is open. The inner ends of the opposite sides of the movable groove (23) are formed with limiting protrusions (24). The movable horizontal plate (28) is movably provided in the movable groove (23). The inner side of the movable horizontal plate (28) is formed with vertical inner top blocks (27). The inner top blocks (27) move between the limiting protrusions (24). One end of the movable horizontal plate (28) is formed with a slot (29). The bottom of the slot (29) is a sloping wall. The second end plate (38) is symmetrically formed with inner insert plates (39). The movable groove (23) is provided with a movable hole (25). The inner insert plate (39) moves in the movable hole (25). The inner end of the inner insert plate (39) is formed with an action slope. The action slope abuts against the sloping wall. When the inner insert plate (39) moves inward, the inner top blocks (27) move closer to each other.

5. The chuck for grinding workpiece holes according to claim 4, characterized in that, The inner top block (27) has a lower plate (30) symmetrically formed on both sides. The lower plate (30) moves below the limiting protrusion (24). A strip hole (31) is provided on the lower plate (30). A limiting pin (32) passes through the strip hole (31). The upper end of the limiting pin (32) is fixed to the limiting protrusion (24), and the lower end of the limiting pin (32) is fixed to the bottom of the movable groove (23).

6. The chuck for grinding workpiece holes according to claim 1, characterized in that, The bottom of the limiting groove (270) has multiple arc-shaped grooves (200), and the two ends of the arc-shaped grooves (200) extend to the periphery of the disk (2).

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