Positioning device for numerical control machine tool

Abstract

The application discloses a positioning device for numerical control machine tools, which is characterized in that the inner thread of the lower end of the variable-diameter center groove of the positioning body is connected with a bolt; a conical shaft II is sleeved outside the bolt, the lower end of the conical shaft II is arranged in the light hole at the lower end of the variable-diameter center groove, and the nut of the bolt is pressed on the center variable-diameter hole step of the conical shaft II; the conical shaft I is assembled on the outer wall of the conical shaft II with a slight gap, the outer circle of the boss of the conical shaft I is matched with the wall of the variable-diameter center groove of the positioning body with a slight gap; the spring II is arranged between the outer step of the conical shaft II and the bottom wall of the spring accommodating groove of the conical shaft I; the spring I is arranged between the conical shaft I and the step of the variable-diameter center groove of the positioning body; the support block II or the support block I is assembled in the upper-end one-row or lower-end one-row rectangular hole with a slight gap; and the inner end surface of the support block I is matched with the conical outer wall of the conical shaft I with a slight gap. The positioning device can position the parts with cylindrical holes and the parts with conical holes or the parts with circular ring grooves in the machining center or the lathe at one time, and is suitable for a wide range of applications.

Description

Technical Field

[0001] This invention belongs to the field of machining and relates to a positioning device for CNC machine tools. Background Technology

[0002] When machining existing parts with cylindrical holes, conical holes, or internal circular grooves, special positioning fixtures are required to position them on the machining center or lathe.

[0003] Parts with cylindrical holes require cylindrical pins that fit with the holes with a micro-clearance for positioning. Parts with different diameter cylindrical holes require pins of varying diameters to match, leading to high manufacturing and management costs. Parts with conical holes or internal circular grooves, due to their structural limitations, generally do not use conical holes or circular grooves as positioning holes. Instead, a separate cylindrical positioning hole needs to be fabricated on the part itself or on an external process table. After the part is machined, the process table is removed. This requires additional raw material input and the use of pins of different specifications, resulting in significant additional material, tooling, and management costs for production. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a positioning device for CNC machine tools. This positioning device can position parts with cylindrical holes, as well as parts with conical holes or internal circular grooves, on a machining center or lathe in one operation. It has a wide range of applications, simple structure, convenient operation, and high processing efficiency, which greatly reduces the cost of part processing and the manufacturing and management costs of the positioning device.

[0005] To achieve the above objectives, the technical solution of the present invention is: a positioning device for a CNC machine tool, comprising a positioning body, a bolt, a tapered shaft II, a tapered shaft I, a spring I, and a spring II installed in the variable diameter center groove of the positioning body, an end cover installed on the upper end of the positioning body, a support block II, and a support block I; the bolt is located at the center of the variable diameter center groove and its lower end is threaded into the internal thread at the lower end of the variable diameter center groove; the lower end of the central variable diameter hole of the tapered shaft II is in a micro-clearance fit with the bolt, and the upper end is adapted to the nut; the outer wall of the tapered shaft II is provided with It has an outer step, with the upper outer wall of the outer step being conical and the lower outer wall being cylindrical; the conical shaft II is sleeved on the outside of the bolt, with its lower end placed in the light hole at the lower end of the variable diameter center groove and fitted with a micro-clearance; the bolt nut is pressed against the central variable diameter hole step of the conical shaft II; the conical shaft I is a cone with an outer boss at the upper end and a central cylindrical hole, and its micro-clearance fit is made on the cylindrical outer wall of the conical shaft II, with the outer circle of its boss fitting with the wall of the variable diameter center groove of the positioning body with a micro-clearance; a spring receiving groove is opened on the upper end face of the conical shaft I; on the outer platform of the conical shaft II... A spring II is provided between the bottom wall of the spring receiving groove of the conical shaft I and the step, and is fitted onto the outer wall of the cylindrical outer wall of the conical shaft II and the inner end wall of the spring receiving groove of the conical shaft I; a spring I is provided between the step of the conical shaft I and the step of the variable diameter center groove of the positioning body, and is fitted onto the outer wall of the conical shaft II; the positioning body has two rows of three or more rectangular holes in each row along the radial direction, and the outer wall of the positioning body at the lower end of the rectangular holes in the lower row is provided with a shoulder for installing parts; a support block II is fitted into the rectangular holes in the upper row with a micro-gap, and a support block II is fitted into the rectangular holes in the lower row with a micro-gap. The support block Ⅰ is fitted with a gap, and the outer end faces of both support block Ⅱ and support block Ⅰ are cylindrical; the inner end face of support block Ⅱ is in slight clearance fit with the conical outer wall of conical shaft Ⅱ; the inner end face of support block Ⅰ is in slight clearance fit with the conical outer wall of conical shaft Ⅰ; the upper ends of support block Ⅱ and support block Ⅰ are provided with spring slot Ⅰ and spring slot Ⅱ, and spring Ⅲ engaged in each spring slot Ⅰ pulls and fixes each support block Ⅱ; spring Ⅳ engaged in each spring slot Ⅱ pulls and fixes each support block Ⅰ; the end cover is detachably fixed to the upper end of the positioning body.

[0006] More preferably, the end cap is threadedly fixed within the internal thread of the upper end of the variable diameter center groove of the positioning body. The structure is simple, the fixation is reliable, and it is easy to disassemble.

[0007] More preferably, spring I and spring II are rectangular springs. Rectangular springs have a large elastic force.

[0008] More preferably, the angle of the cone shape on the outer wall of the cone shaft II is the same as the angle of the cone shape on the outer wall of the cone shaft I.

[0009] In use, place the workpiece on the shoulder of the positioning body, rotate the bolt, and the bolt moves downward, pushing the tapered shaft II downward. The tapered shaft II pushes each support block II to expand radially outward until it fits against the inner hole of the workpiece. At the same time, the tapered shaft II presses the tapered shaft I through the spring II, causing the tapered shaft I to slide downward, pushing each support block I to expand radially outward and fit tightly against the inner hole of the workpiece. When disassembling the workpiece, rotate the bolt in the opposite direction until it fits against the end cover. At this time, the tapered shaft I and tapered shaft II slide upward under the action of springs I and II, and the support blocks I and II retract radially under the action of springs III and IV, allowing the workpiece to be removed.

[0010] Compared with existing technologies, the advantages of this invention are: This invention is applicable to the positioning of parts with a rotation center structure, regardless of whether the part has a cylindrical hole, a conical hole, or a circular annular groove, and can adapt to the hole diameter. When the hole diameter is large, the bolt is adjusted downwards to a deeper depth; when the hole diameter is small, the bolt is adjusted downwards to a shallower depth. This invention can position parts with cylindrical holes, as well as parts with conical holes or internal circular annular grooves, in a single operation on a machining center or lathe. It has a wide range of applications, a simple structure, is easy to operate, and has high processing efficiency, greatly reducing the cost of part processing and the manufacturing and management costs of the positioning device. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0012] Figure 2 This is a front sectional view of the present invention;

[0013] Figure 3 This is a top view of the present invention. Detailed Implementation

[0014] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0015] like Figure 1 , Figure 2 and Figure 3As shown, this embodiment includes a positioning body 2, a bolt 6, a tapered shaft II 7, a tapered shaft I 4, a spring I 8, and a spring II 9 installed in the variable diameter center groove 13 of the positioning body 2, an end cap 1, a support block II 3, and a support block I 5 installed on the upper end of the positioning body 2. The bolt 6 is located at the center of the variable diameter center groove 13 and its lower end is threaded into the internal thread at the lower end of the variable diameter center groove 13; the lower end of the central variable diameter hole of the tapered shaft II 7 is in a slight clearance fit with the bolt 6, and its upper end is fitted with a nut; the outer wall of the tapered shaft II 7 is provided with an outer step, the upper end of the outer wall of the outer step is tapered, and the lower end of the outer wall is cylindrical; the tapered shaft II 7 is sleeved on the bolt 6, and its lower end is placed in the light hole at the lower end of the variable diameter center groove 13 with a slight clearance fit, and the nut of the bolt 6 is pressed against the tapered shaft II 7. On the central variable diameter hole step of 7; the tapered shaft I4 is a cone with an outer boss at the upper end and a cylindrical hole in the center, which is fitted with a slight clearance on the cylindrical outer wall of the tapered shaft II7, and the outer circle of the boss is fitted with a slight clearance to the wall of the variable diameter central groove 13 of the positioning body; a spring receiving groove is opened on the upper end face of the tapered shaft I4; a spring II9 is ​​provided between the outer step of the tapered shaft II7 and the bottom wall of the spring receiving groove of the tapered shaft I4, which is sleeved on the cylindrical outer wall of the tapered shaft II7 and the inner end wall of the spring receiving groove of the tapered shaft I4. A spring I8 is fitted onto the outer wall of the tapered shaft II7 between the step of the tapered shaft I4 and the variable diameter center groove 13 of the positioning body; the positioning body 2 has two rows of rectangular holes with three or more holes in each row along the radial direction, and a shoulder 12 for mounting parts is provided on the outer wall of the positioning body 2 at the lower end of the rectangular holes in the lower row; a support block II3 is fitted with a micro-gap in the rectangular holes in the upper row, and a support block I5 is fitted with a micro-gap in the rectangular holes in the lower row, and the outer end faces of the support block II3 and the support block I5 are both... The support block Ⅱ3 is cylindrical; the inner end face of the support block Ⅱ3 is in slight clearance fit with the tapered outer wall of the tapered shaft Ⅱ7; the inner end face of the support block Ⅰ5 is in slight clearance fit with the tapered outer wall of the tapered shaft Ⅰ4; both the support block Ⅱ3 and the support block Ⅰ5 are provided with spring slots Ⅰ and Ⅱ at their upper ends, and springs Ⅲ11, which are engaged in each spring slot Ⅰ, tighten and fix each support block Ⅱ3; springs Ⅳ10, which are engaged in each spring slot Ⅱ, tighten and fix each support block Ⅰ5; the end cover 1 is detachably fixed to the upper end of the positioning body 2. For structural simplicity, reliable fixation, and easy disassembly, the end cover 1 in this embodiment is threaded into the internal thread at the upper end of the variable diameter center groove 13 of the positioning body. This prevents the tapered shaft Ⅱ7 and the support block Ⅱ3 from coming out. In order to ensure that the rectangular spring has a large elastic force and ensures reliable sliding of the tapered shaft Ⅰ4, springs Ⅰ8 and Ⅱ9 in this embodiment are rectangular springs. To ensure a more balanced support force between support block II3 and support block I5, the cone angle of the outer wall of tapered shaft II7 is the same as that of the outer wall of tapered shaft I4.

[0016] In use, place the workpiece on the positioning shoulder 12, rotate bolt 6, and bolt 6 moves downward, pushing tapered shaft II 7 downward. Tapered shaft II 7 pushes each support block II 3 to expand radially outward until it fits against the inner hole of the workpiece. At the same time, tapered shaft II 7 presses tapered shaft I 4 through spring II 9, causing tapered shaft I 4 to slide downward, pushing each support block I 5 to expand radially outward and fit tightly against the inner hole of the workpiece. When disassembling the workpiece, rotate bolt 6 in the opposite direction until it fits against end cover 1. At this time, tapered shaft I 4 and tapered shaft II 7 slide upward under the action of spring I 8 and spring II 9, and support blocks I 5 and support blocks II 3 retract radially under the action of spring III 11 and spring IV 10, allowing the workpiece to be removed.

[0017] Of course, there are other embodiments of the present invention. Without departing from the spirit and essence of the present invention, those skilled in the art can make corresponding changes and modifications according to the present invention. However, these corresponding changes and modifications should all be considered improvements of equivalent technology and fall within the protection scope of the claims of the present invention.

Claims

1. A positioning device for a CNC machine tool, characterized in that: Includes a positioning body (2), a bolt (6), a tapered shaft II (7), a tapered shaft I (4), a spring I (8), and a spring II (9) installed in the diameter-changing center groove (13) of the positioning body (2), an end cap (1) installed on the upper end of the positioning body (2), a support block II (3), and a support block I (5); the bolt (6) is located at the center of the diameter-changing center groove (13) and its lower end is threaded into the internal thread at the lower end of the diameter-changing center groove (13); the lower end of the diameter-changing hole of the tapered shaft II (7) is in a slight clearance fit with the bolt (6), and the upper end is fitted with a nut; the outer wall of the tapered shaft II (7) is provided with an outer step, and the upper end of the outer step has a... The outer wall is conical, and the lower outer wall is cylindrical; the conical shaft II (7) is sleeved on the outside of the bolt (6), and the lower end is placed in the light hole at the lower end of the variable diameter center groove (13) with a micro-clear clearance fit. The nut of the bolt (6) is pressed onto the step of the central variable diameter hole of the conical shaft II (7); the conical shaft I (4) is a cone with an outer boss at the upper end and a cylindrical hole in the center. Its micro-clear clearance fit is on the cylindrical outer wall of the conical shaft II (7), and the outer circle of its boss is in micro-clear clearance fit with the wall of the variable diameter center groove (13) of the positioning body; the upper end face of the conical shaft I (4) has a spring receiving groove; the outer step of the conical shaft II (7) and the spring receiving groove of the conical shaft I (4) are in micro-clear clearance fit. A spring II (9) is provided between the bottom walls of the groove and the inner end wall of the spring receiving groove of the conical shaft II (7) and the conical shaft I (4); a spring I (8) is provided between the steps of the conical shaft I (4) and the variable diameter center groove (13) of the positioning body and is fitted on the outer wall of the conical shaft II (7); the positioning body (2) has two rows of three or more rectangular holes in each row along the radial direction, and a shoulder (12) for installing parts is provided on the outer wall of the positioning body (2) at the lower end of the rectangular holes of the lower row; a support block II (3) is fitted in the rectangular holes of the upper row with a micro-gap, and a support block I (5) is fitted in the rectangular holes of the lower row with a micro-gap. The outer end faces of support block II (3) and support block I (5) are both cylindrical; the inner end face of support block II (3) is in micro-clear clearance fit with the tapered outer wall of tapered shaft II (7); the inner end face of support block I (5) is in micro-clear clearance fit with the tapered outer wall of tapered shaft I (4); the upper ends of support block II (3) and support block I (5) are provided with spring slot I and spring slot II, and spring III (11) in each spring slot I pulls and fixes each support block II (3); spring IV (10) in each spring slot II pulls and fixes each support block I (5); the end cover (1) is detachably fixed to the upper end of the positioning body (2).

2. The positioning device for CNC machine tools according to claim 1, characterized in that: The end cap (1) is threadedly fixed in the internal thread at the upper end of the variable diameter center groove (13) of the positioning body.

3. The positioning device for CNC machine tools according to claim 1 or 2, characterized in that: Spring I (8) and spring II (9) are rectangular springs.

4. The positioning device for CNC machine tools according to claim 3, characterized in that: The angle of the cone on the outer wall of the cone shaft II (7) is the same as the angle of the cone on the outer wall of the cone shaft I (4).

5. The positioning device for CNC machine tools according to claim 1 or 2, characterized in that: The angle of the cone on the outer wall of the cone shaft II (7) is the same as the angle of the cone on the outer wall of the cone shaft I (4).

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