CN110977510A - Clamping jig for deep hole machining of thin-wall workpiece - Google Patents

Clamping jig for deep hole machining of thin-wall workpiece Download PDF

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Publication number
CN110977510A
CN110977510A CN201911237958.1A CN201911237958A CN110977510A CN 110977510 A CN110977510 A CN 110977510A CN 201911237958 A CN201911237958 A CN 201911237958A CN 110977510 A CN110977510 A CN 110977510A
Authority
CN
China
Prior art keywords
workpiece
clamping
positioning seat
thin
deep hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911237958.1A
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Chinese (zh)
Inventor
任传文
罗晓峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Xinneng Precise Machinery Co ltd
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Suzhou Xinneng Precise Machinery Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou Xinneng Precise Machinery Co ltd filed Critical Suzhou Xinneng Precise Machinery Co ltd
Priority to CN201911237958.1A priority Critical patent/CN110977510A/en
Publication of CN110977510A publication Critical patent/CN110977510A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q2703/00—Work clamping
    • B23Q2703/02—Work clamping means
    • B23Q2703/10—Devices for clamping workpieces of a particular form or made from a particular material

Abstract

The invention relates to a clamping jig for deep hole machining of a thin-wall workpiece, which comprises a first positioning seat fixedly connected with a main shaft of a machine tool, a second positioning seat butted with a rotating shaft of an oil feeder, a first fastening mechanism positioned on the side where the first positioning seat is positioned and used for fixing one end part of the workpiece relative to the first positioning seat, and a second fastening mechanism positioned on the side where the second positioning seat is positioned and used for fixing the other end part of the workpiece relative to the second positioning seat; when the workpiece is clamped on the clamping jig, the workpiece is abutted between the first positioning seat and the second positioning seat; according to the clamping jig for deep hole machining of the thin-wall workpiece, the workpiece is clamped in a double-locking mode at two ends, the workpiece is small in deformation and high in positioning accuracy, axial force is not generated on the workpiece due to clamping, the workpiece is prevented from bending and deforming, and the stability of the machining accuracy of the workpiece is facilitated.

Description

Clamping jig for deep hole machining of thin-wall workpiece
Technical Field
The invention relates to a clamping jig for deep hole machining of a thin-wall workpiece.
Background
The deep hole drilling and boring machine is used for processing a hole diameter ratio (D/L) of 1: deep holes of more than 6, such as deep holes in parts such as gun barrels, machine tool spindles and the like. The deep hole drilling machine is universal, special and modified by a common lathe, and is horizontal in layout for facilitating cooling and chip removal, namely a workpiece to be machined (mainly a long rod) is horizontally arranged and fixed on the lathe. For a workpiece with a high wall thickness value after drilling, generally, double-side conical disks (female tip sleeves) are adopted for automatic centering, namely, the workpiece is propped and fixed from two ends of the workpiece through the conical disks on two sides, and compared with a chuck, the fixing mode is higher in concentricity of two ends of the workpiece, higher in positioning accuracy and small in repeated error, and is a high-efficiency and reliable clamping mode. However, for a workpiece with a lower wall thickness value after machining or an easily-deformed workpiece with a thinner wall thickness before machining, the clamping mode is adopted, so that the workpiece to be machined is abutted by two ends due to lower strength of the workpiece, the axial stress of the workpiece is large, the workpiece is easy to bend and deform, and the workpiece is heated in the machining process and can be subjected to thermal deformation and elongation, so that the axial force of the workpiece is further increased, the machining precision of the workpiece is influenced, and the workpiece is deformed and scrapped.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a clamping jig for deep hole machining of a thin-wall workpiece.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a clamping jig for deep hole machining of thin-wall workpieces comprises a first positioning seat fixedly connected with a machine tool spindle, a second positioning seat in butt joint with a rotating shaft of an oil feeder, a first fastening mechanism located on the side where the first positioning seat is located and used for fixing one end of a workpiece relative to the first positioning seat, and a second fastening mechanism located on the side where the second positioning seat is located and used for fixing the other end of the workpiece relative to the second positioning seat; and when the workpiece is clamped on the clamping jig, the workpiece is abutted between the first positioning seat and the second positioning seat.
Preferably, the clamping jig further comprises a buffer mechanism for providing buffer force for the workpiece from the axial direction of the workpiece when the workpiece is clamped on the clamping jig.
Preferably, the buffer mechanism includes an elastic buffer pad disposed on an end surface of the second positioning seat close to the first positioning seat.
Preferably, the first fastening mechanism comprises an elastic jacket fixedly connected with the first positioning seat and a tightening mechanism for tightening the elastic jacket, and when the tightening mechanism tightens the elastic jacket, the end part of the workpiece can be fixed on the inner periphery of the elastic jacket.
Preferably, the elastic clamping sleeve is provided with a connecting part fixedly connected with the first positioning seat and a clamping claw part which is integrally arranged with the connecting part and is used for clamping the workpiece.
Preferably, the tightening mechanism comprises a tightening sleeve movably arranged along the axial direction of the workpiece, a first conical inclined surface is formed on the inner periphery of the tightening sleeve, a second conical inclined surface matched with the first conical inclined surface is formed on the outer periphery of the clamping jaw, and when the tightening sleeve moves, the tightening sleeve presses against the second conical inclined surface through the first conical inclined surface, so that the inner periphery of the clamping jaw can be attached to the workpiece tightly and clamp the workpiece.
Preferably, the tightening mechanism further comprises a driver that drives the tightening sleeve in an axial direction of the workpiece.
Preferably, the second fastening mechanism is arranged symmetrically to the first fastening mechanism.
Preferably, the material of the elastic buffer cushion is polyurethane
Preferably, the inner edge of the opening of the clamping claw part is provided with a chamfer.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the clamping jig for deep hole machining of the thin-wall workpiece, the workpiece is clamped in a double-locking mode at two ends, the workpiece is small in deformation and high in positioning accuracy, axial force is not generated on the workpiece due to clamping, the workpiece is prevented from bending and deforming, and the stability of the machining accuracy of the workpiece is facilitated.
Drawings
FIG. 1 is a schematic cross-sectional view of a clamping fixture according to the present invention;
wherein: 100. A workpiece; 10. a first positioning seat; 20. a second positioning seat; 30. an elastic cushion pad; 31. an elastic jacket; 32. and (5) tightening the sleeve.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 1, a clamping jig for deep hole machining of a thin-walled workpiece 100 includes a first positioning seat 10 fixedly connected to a spindle of a machine tool, a second positioning seat 20 in butt joint with a rotating shaft of an oil feeder, a first fastening mechanism located at a side of the first positioning seat 10 for fixing one end of the workpiece 100 relative to the first positioning seat 10, and a second fastening mechanism located at a side of the second positioning seat 20 for fixing the other end of the workpiece 100 relative to the second positioning seat 20; and when the workpiece 100 is clamped on the clamping fixture, the workpiece 100 abuts between the first positioning seat 10 and the second positioning seat 20.
In this embodiment, the clamping fixture further includes a buffer mechanism for providing a buffer force to the workpiece 100 from the axial direction thereof when the workpiece 100 is clamped on the clamping fixture, wherein the buffer mechanism mainly includes an elastic buffer pad 30 disposed on an end surface of the second positioning seat 20 close to the first positioning seat 10; the material of the elastic buffer pad 30 is polyurethane.
In addition, the first fastening mechanism includes an elastic clamping sleeve 31 fixedly connected with the first positioning seat 10, and a tightening mechanism for tightening the elastic clamping sleeve 31, the elastic clamping sleeve 31 has a connecting portion fixedly connected with the first positioning seat 10, and a clamping claw portion integrally provided with the connecting portion for clamping the workpiece 100 (an inner edge of an opening of the clamping claw portion is provided with a chamfer capable of guiding the workpiece 100, so that an end portion of the workpiece 100 can enter an inner periphery of the clamping claw portion). The tightening mechanism comprises a tightening sleeve 32 movably arranged in the axial direction of the workpiece 100 and a driver for driving the tightening sleeve 32 to move in the axial direction of the workpiece 100, a first conical inclined surface is formed on the inner periphery of the tightening sleeve 32, a second conical inclined surface matched with the first conical inclined surface is formed on the outer periphery of the jaw part, when the tightening sleeve 32 moves, the tightening sleeve 32 presses against the second conical inclined surface through the first conical inclined surface, the inner periphery of the jaw part can be attached to and abutted against the workpiece 100, and then the end part of the workpiece 100 can be fixed on the inner periphery of the elastic jacket 31.
In this embodiment, the elastic clamping sleeve 31 is made of metal, and some clamping sleeves commonly used in the prior art can be referred to, for example, a clamping sleeve of a clamping tool on a milling cutter handle, the connecting portion of the elastic clamping sleeve 31 is a full circular ring and is fixedly connected with the first positioning seat 10, and the clamping jaw portions are petal-shaped, that is, each clamping jaw is circumferentially distributed and is fixedly integrated with the connecting portion, a gap is formed between each clamping jaw, each clamping jaw is separated from each other before the workpiece 100 is clamped, so that the internal space of the clamping jaw is large, and when the workpiece 100 is clamped, the clamping jaws are close to each other, so that the workpiece 100 is clamped.
The driver for driving the tightening sleeve 32 to move back and forth is an air cylinder (not shown in the figure), and when the workpiece 100 is machined, the workpiece 100 is driven by the spindle to rotate around the axis of the workpiece 100, so that a tool clamp for clamping the workpiece needs to rotate, the air cylinder and the first positioning seat 10 are also fixed on the rotating shaft of the oil feeder, the power output shaft of the air cylinder is annular, and the first positioning seat 10 is positioned on the inner periphery of the air cylinder.
The specific structure of the first fastening mechanism is described above, and since the first fastening mechanism and the second fastening mechanism are symmetrically arranged, that is, the specific structural arrangement of the second fastening mechanism is the same as the specific structural arrangement of the first fastening mechanism, so that the detailed description is omitted.
The oil feeding device is arranged on a frame of the deep hole drilling and boring machine in a sliding manner along the axial direction of the workpiece 100 and moves through a servo motor driver, so that the second positioning seat 20 and the second fastening mechanism which are arranged on the oil feeding device move along with the movement of the oil feeding device, when the workpiece 100 is clamped, the oil feeding device drives the second positioning seat 20 and the second fastening mechanism to move towards one side of the main shaft, the workpiece 100 is abutted between the first positioning seat 10 and the second positioning seat 20, and finally, the two ends are clamped through the first fastening mechanism and the second fastening mechanism; when the machining is finished, the first fastening mechanism is loosened, the oil feeder moves towards the side far away from the main shaft, the workpiece 100 falls off from the first fastening mechanism, the second fastening mechanism is loosened, and the workpiece 100 is taken down.
In conclusion, the clamping jig for deep hole machining of the thin-wall workpiece has the advantages that the workpiece is clamped in a double-locking mode at two ends, the workpiece is small in deformation and high in positioning accuracy, axial force is not generated on the workpiece by clamping, the workpiece is prevented from bending and deforming, and the stability of the machining accuracy of the workpiece is facilitated.
When the second positioning seat moves to abut the workpiece to the first positioning seat and the second positioning seat, the buffering effect of the elastic buffering cushion compensates for the influence caused by the length error of the workpiece, the axial positioning is stable and reliable, the hard interference between the two ends of the workpiece and the first positioning seat and the second positioning seat is avoided, and meanwhile, the elastic buffering cushion can reduce the axial force generated by the thermal deformation extension of the workpiece and is favorable for guaranteeing the processing precision.
The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.

Claims (10)

1. The utility model provides a thin wall class work piece is clamping tool for BTA which characterized in that: the clamping jig comprises a first positioning seat fixedly connected with a machine tool spindle, a second positioning seat in butt joint with a rotating shaft of the oil feeder, a first fastening mechanism located on the side where the first positioning seat is located and used for fixing one end of the workpiece relative to the first positioning seat, and a second fastening mechanism located on the side where the second positioning seat is located and used for fixing the other end of the workpiece relative to the second positioning seat; and when the workpiece is clamped on the clamping jig, the workpiece is abutted between the first positioning seat and the second positioning seat.
2. The clamping jig for deep hole machining of the thin-wall workpiece according to claim 1, characterized in that: the clamping fixture further comprises a buffer mechanism which provides buffer force for the workpiece from the axial direction of the workpiece when the workpiece is clamped on the clamping fixture.
3. The clamping jig for deep hole machining of the thin-wall workpiece according to claim 2, characterized in that: the buffer mechanism comprises an elastic buffer pad arranged on one end face, close to the first positioning seat, of the second positioning seat.
4. The clamping jig for deep hole machining of the thin-wall workpiece according to claim 1, characterized in that: the first fastening mechanism comprises an elastic clamping sleeve fixedly connected with the first positioning seat and a tightening mechanism used for tightening the elastic clamping sleeve, and when the tightening mechanism tightens the elastic clamping sleeve, the end part of the workpiece can be fixed on the inner periphery of the elastic clamping sleeve.
5. The clamping jig for deep hole machining of the thin-wall workpiece according to claim 4, characterized in that: the elastic clamping sleeve is provided with a connecting part fixedly connected with the first positioning seat and a clamping claw part which is integrally arranged with the connecting part and used for clamping the workpiece.
6. The clamping jig for deep hole machining of the thin-wall workpiece according to claim 5, characterized in that: the tightening mechanism comprises a tightening sleeve movably arranged along the axial direction of the workpiece, a first conical inclined surface is formed on the inner periphery of the tightening sleeve, a second conical inclined surface matched with the first conical inclined surface is formed on the outer periphery of the clamping jaw, and when the tightening sleeve moves, the tightening sleeve presses against the second conical inclined surface through the first conical inclined surface, so that the inner periphery of the clamping jaw can be attached to the workpiece tightly and clamps the workpiece.
7. The clamping jig for deep hole machining of the thin-wall workpiece according to claim 6, characterized in that: the tightening mechanism further comprises a driver for driving the tightening sleeve to move along the axial direction of the workpiece.
8. The clamping jig for deep hole machining of the thin-wall workpiece according to claim 1, characterized in that: the second fastening mechanism and the first fastening mechanism are symmetrically arranged.
9. The clamping jig for deep hole machining of the thin-wall workpiece according to claim 3, characterized in that: the elastic buffer cushion is made of polyurethane.
10. The clamping jig for deep hole machining of the thin-wall workpiece according to claim 5, characterized in that: the inner edge of the opening of the clamping claw part is provided with a chamfer.
CN201911237958.1A 2019-12-06 2019-12-06 Clamping jig for deep hole machining of thin-wall workpiece Pending CN110977510A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911237958.1A CN110977510A (en) 2019-12-06 2019-12-06 Clamping jig for deep hole machining of thin-wall workpiece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911237958.1A CN110977510A (en) 2019-12-06 2019-12-06 Clamping jig for deep hole machining of thin-wall workpiece

Publications (1)

Publication Number Publication Date
CN110977510A true CN110977510A (en) 2020-04-10

Family

ID=70090855

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911237958.1A Pending CN110977510A (en) 2019-12-06 2019-12-06 Clamping jig for deep hole machining of thin-wall workpiece

Country Status (1)

Country Link
CN (1) CN110977510A (en)

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