Cylindrical hard alloy compact clamping tool

Abstract

A cylindrical hard alloy compact clamping tool comprises a column body, a middle hole is coaxially formed in the column body, a plurality of grooves are formed in the inner circumference of the middle hole, inner jacking blocks are arranged in the grooves, a tightening ring is arranged in the middle hole in a penetrating mode, the inner walls of the inner jacking blocks act on the outer wall of the tightening ring, one end of the column body is connected with an inner jacking ring through threads, and an end jacking ring is arranged at the end of the inner jacking ring. A penetrating hole is formed in the end top ring, and the cylindrical hard alloy compact penetrates into the tightening ring. When the end jacking ring moves inwards, the end jacking ring can act on the end face of the inner jacking block, the inner jacking block can extrude the tightening ring under the action of the groove, then the tightening ring is tightened, a workpiece is clamped and positioned in a tightening ring surrounding mode, the positioning and clamping mode is a surrounding mode, and therefore the workpiece can be positioned more accurately. Therefore, the periphery of the pressed blank can be uniformly stressed, and the problem that the pressed blank is damaged during positioning is avoided.

Description

Technical Field

[0001] This utility model relates to the field of cemented carbide processing technology, and in particular to a cylindrical cemented carbide blank clamping fixture. Background Technology

[0002] Carbide blanks are blanks made by pressing alloy powder with a certain viscosity. Because the sintered blanks have high hardness, their shape is often shaped by machining, followed by sintering. However, during machining, due to the very low strength of carbide blanks, precise control of clamping force is required. When machining the end faces or inner holes of cylindrical or annular blanks, the lathe's built-in three-jaw chuck cannot be used for clamping. Furthermore, this clamping method suffers from uneven force distribution, easily damaging the blank. Utility Model Content

[0003] This utility model provides a cylindrical cemented carbide blank clamping fixture to overcome the shortcomings of the prior art, facilitate the clamping of cylindrical blanks during processing, and avoid damage to the blanks, thus having strong practicality.

[0004] In order to achieve the purpose of this utility model, the following technology is proposed to be adopted:

[0005] A cylindrical cemented carbide blank clamping fixture includes a column with a central hole coaxially formed within it. Multiple grooves are formed on the inner circumference of the central hole, and inner top blocks are placed within the grooves. A tightening ring passes through the central hole, with the inner wall of the inner top blocks acting on the outer wall of the tightening ring. One end of the column is threadedly connected to the inner top ring, and the end of the inner top ring has an end top ring with a through hole. The cylindrical cemented carbide blank passes through the tightening ring. When the end top ring moves inward, it acts on the end face of the inner top blocks, which, under the action of the grooves, compress the tightening ring, thus tightening it. The workpiece is clamped and positioned by the tightening ring's encircling action. This clamping and positioning method, using an encircling motion, ensures that the outer circumference of the blank is evenly stressed, preventing damage to the blank during positioning.

[0006] Furthermore, in order to limit the inner top block through the slot, the slot is designed in the shape of a dovetail or a T-shape, and the structure of the inner top block matches the structure of the slot.

[0007] Furthermore, when the outer end of the inner top block is subjected to a force, the inner top block can move inward along the radial direction of the column. Therefore, the bottom of the groove is set as an inclined surface, the outer wall of the inner top block is an inclined wall, the inclined wall acts on the inclined surface, and the inner end of the inclined surface of the bottom of the groove is inclined towards the central hole.

[0008] Furthermore, in order to enable the tightening ring to shrink and press the blank, a notch is provided on the tightening ring parallel to its axial direction.

[0009] Furthermore, in order to enable the tightening ring to move synchronously with the inner top block, locking protrusions are provided at both ends of the inner wall of the inner top block, and the locking protrusions act on both ends of the tightening ring.

[0010] Furthermore, in order to facilitate the rotation of the inner top ring, multiple anti-slip grooves are provided on the outer periphery of the inner top ring.

[0011] The advantages of the above technical solution are:

[0012] This invention can perform positioning and clamping during the processing of cylindrical or annular blanks, and can avoid damage to the blanks during positioning and clamping. Attached Figure Description

[0013] 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.

[0014] Figure 1 A three-dimensional structural diagram of one embodiment is shown.

[0015] Figure 2 A three-dimensional structural diagram of the column is shown.

[0016] Figure 3 A three-dimensional structural diagram of the inner top block and the tightening ring is shown. Detailed Implementation

[0017] like Figures 1-3 As shown, a cylindrical cemented carbide blank clamping fixture includes a column 3, a central hole 30 coaxially formed inside the column 3, and multiple grooves 31 formed on the inner circumference of the central hole 30. The grooves 31 are dovetail-shaped or T-shaped, and the bottom of the grooves 31 is inclined.

[0018] The groove 31 is provided with an inner top block 32. The structure of the inner top block 32 matches the structure of the groove 31. The outer wall of the inner top block 32 is an inclined wall. The inclined wall acts on the inclined surface, and the inner end of the inclined surface of the bottom of the groove 31 is inclined towards the central hole 30.

[0019] A tightening ring 34 is inserted through the central hole 30. The inner wall of the inner top block 32 acts on the outer wall of the tightening ring 34. A notch is opened on the tightening ring 34 parallel to its axial direction. The inner wall of the inner top block 32 is provided with a locking protrusion 33 at both ends, and the locking protrusion 33 acts on both ends of the tightening ring 34.

[0020] One end of the column 3 is connected to an inner top ring 2 by a thread. Multiple anti-slip grooves 20 are provided on the outer periphery of the inner top ring 2. An end top ring 21 is provided at the end of the inner top ring 2, and a through hole 22 is provided on the end top ring 21.

[0021] A cylindrical cemented carbide blank is inserted into the tightening ring 34.

[0022] In this embodiment, during operation, a cylindrical or annular blank 4 is inserted into the tightening ring 34. The operator then screws the inner top ring 2 onto the column 3. During screwing, the inner side of the top ring 21 acts on the outer end of the inner top block 32, causing the inner top block 32 to move inward under the pushing force. During this movement, the inner wall of the inner top block 32 acts on the tightening ring 34, ultimately clamping and fixing the blank. After fixing, the column 3 can be mounted on the machine tool's clamping jaws for machining operations on the inner wall or exposed end of the blank.

[0023] 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 cylindrical cemented carbide billet clamping fixture, characterized in that, It includes a column (3), a central hole (30) is coaxially opened inside the column (3), and multiple grooves (31) are opened on the inner circumference of the central hole (30). The groove (31) is provided with an inner top block (32); A tightening ring (34) is inserted through the central hole (30), and the inner wall of the inner top block (32) acts on the outer wall of the tightening ring (34); One end of the column (3) is connected to an inner top ring (2) by a thread, and the end of the inner top ring (2) is provided with an end top ring (21), and a through hole (22) is provided on the end top ring (21). A cylindrical cemented carbide blank is inserted into a tightening ring (34).

2. The cylindrical cemented carbide blank clamping fixture according to claim 1, characterized in that, The groove (31) has a dovetail or T-shaped structure, and the structure of the inner top block (32) matches the structure of the groove (31).

3. The cylindrical cemented carbide blank clamping fixture according to claim 2, characterized in that, The bottom of the groove (31) is an inclined surface, the outer wall of the inner top block (32) is an inclined wall, the inclined wall acts on the inclined surface, and the inner end of the inclined surface of the bottom of the groove (31) is inclined towards the central hole (30).

4. The cylindrical cemented carbide blank clamping fixture according to claim 1, characterized in that, The tightening ring (34) has a notch parallel to its axial direction.

5. The cylindrical cemented carbide blank clamping fixture according to claim 1, characterized in that, The inner top block (32) has a locking protrusion (33) at both ends of its inner wall, and the locking protrusion (33) acts on both ends of the tightening ring (34).

6. The cylindrical cemented carbide blank clamping fixture according to claim 1, characterized in that, Multiple anti-slip grooves (20) are provided on the outer periphery of the inner top ring (2).

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