Clamping fixture for finish turning of sheet parts

Abstract

The clamping fixture comprises a tool base, a workpiece and an oil pressure buffer tool, the tool base is arranged to be connected with a machine tool spindle, an avoiding position matched with the workpiece is formed on the matching face of the tool base in a milling mode and used for being matched with the outer circle of the workpiece, and the oil pressure buffer tool is arranged on the tool base. The oil pressure buffer tool is connected with a tool rest of a machine tool, a positioning hole is formed in the oil pressure buffer tool, an oil pressure buffer is connected into the positioning hole, an ejection head of the oil pressure buffer is arranged to directly face a workpiece, and the ejection stroke of the ejection head of the oil pressure buffer towards the workpiece is arranged to be capable of being adjusted in the moving direction of the tool rest. By means of the mode, the clamping fixture for finish turning of the sheet type parts is easy to use, clamping is convenient, end face runout can be obviously reduced or eliminated, machining stability and product quality are improved, and machining quality of sheet type workpieces is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of parts processing tooling, in particular to a clamping fixture for precision turning thin-sheet parts. Background Art

[0002] In conventional turning processes, a three-jaw chuck is generally used and the outer circle of the workpiece is used as the positioning reference for processing.

[0003] During machining, thinner workpieces often experience insufficient rigidity due to their thinness, leading to misaligned jaws during clamping, often causing slight deformation of the workpiece. This deformation becomes particularly noticeable during the subsequent finish turning phase, manifesting as surface runout on the workpiece. This negatively impacts machining quality, makes workpiece size control difficult, and can delay production schedules. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide a clamping fixture for fine-turning thin-sheet parts, which is simple to use and convenient to clamp, can significantly reduce or eliminate end face runout, improve processing stability and product quality, and ensure the processing quality of thin-sheet workpieces.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a clamping fixture for fine turning thin-sheet parts, comprising: a fixture base, a workpiece and a hydraulic buffer fixture, wherein the workpiece has a first end face and a second end face arranged opposite to each other, wherein the first end face faces the mating surface of the fixture base, and the second end face faces the hydraulic buffer fixture.

[0006] The tooling base is configured to be connected to the main shaft of the machine tool, and the mating surface of the tooling base is milled to form an avoidance position adapted to the workpiece, for mating with the outer circle of the workpiece.

[0007] The hydraulic buffer fixture is configured to be connected to the machine tool tool holder. A positioning hole is provided on the hydraulic buffer fixture. The hydraulic buffer is connected to the positioning hole. The ram of the hydraulic buffer is configured to face the workpiece. The insertion stroke of the ram of the hydraulic buffer toward the workpiece is configured to be adjustable along the moving direction of the tool holder.

[0008] In a preferred embodiment of the present invention, a predetermined gap is left between the mating surface of the tooling base and the first end face of the workpiece, and the gap is set between 0.05 mm and 0.12 mm.

[0009] In a preferred embodiment of the present invention, a gap of 0.1 mm is maintained between the mating surface of the tooling base and the first end surface of the workpiece.

[0010] In a preferred embodiment of the present invention, there are at least three positioning holes, and the three positioning holes are evenly distributed in a circumferential direction along the hydraulic buffer tooling.

[0011] In a preferred embodiment of the present invention, the oil pressure buffer is installed in the positioning hole in a detachable locking manner, and the second end surface of the workpiece can be tightened by the oil pressure buffer.

[0012] In a preferred embodiment of the present invention, the first end surface of the workpiece can be flush with the mating surface of the tooling base through an oil pressure buffer.

[0013] The beneficial effects of the utility model are: simple to use, convenient clamping, and the ability to quickly complete the positioning and clamping of the workpiece, thereby improving work efficiency; it can ensure that the end face runout of the workpiece during the processing is controlled within a predetermined range; it can provide reliable protection for the production of thin-film parts, and meet the high requirements for product quality and performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0015] Figure 1 This is a structural diagram of a preferred embodiment of a workpiece of the present utility model;

[0016] Figure 2 This is a structural diagram of a preferred embodiment of a clamping fixture for fine turning thin-sheet parts of the present invention;

[0017] Figure 3 This is a front view of a preferred embodiment of a clamping fixture for fine turning thin-sheet parts of the present invention;

[0018] Figure 4 This is a structural schematic diagram of a preferred embodiment of the clamping fixture for fine turning thin-film parts of the present invention when the hydraulic buffer is not in contact with the workpiece;

[0019] Figure 5 This is a structural diagram of a preferred embodiment of the present invention in which the top of the hydraulic buffer in the clamping fixture for fine turning thin-sheet parts is pressed against the workpiece;

[0020] The markings of the components in the accompanying drawings are as follows:

[0021] 1. Tool base, 11. Mating surface, 12. Avoidance position, 2. Workpiece, 21. First end face, 22. Second end face, 3. Hydraulic buffer tool, 31. Positioning hole, 4. Hydraulic buffer, 41. Head, 5. Turning tool. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0024] The utility model relates to a preferred embodiment of a clamping fixture for precision turning thin-sheet parts.

[0025] See also Figures 1 to 5 ,

[0026] The clamping fixture for fine-turning thin-film parts includes: a tooling base 1, a workpiece 2 and a hydraulic buffer tooling 3, wherein the workpiece 2 is clamped on the tooling base 1, and the hydraulic buffer tooling 3 is used to make the workpiece 2 and the mating surface 11 of the tooling base 1 flat to ensure that the turning process can effectively meet the end face runout requirements, and a turning tool 5 is also arranged above the tooling base.

[0027] In detail, the workpiece 2 has a first end face 21 and a second end face 22 that are oppositely arranged, wherein the first end face 21 faces the mating surface 11 of the tooling base 1 , and the second end face 22 faces the oil pressure buffer tooling 3 .

[0028] In a preferred embodiment, the tooling base 1 is configured to be connected to a machine tool spindle to enable power transmission.

[0029] The mating surface 11 of the tooling base 1 is milled to form an avoidance position 12 that is adapted to the workpiece, which is used to cooperate with the outer circle of the workpiece 2. The avoidance position 12 of the tooling base 11 can be accurately milled according to the three-dimensional digital model of the workpiece. The shape, size and position of the avoidance position 12 on the mating surface of the tooling base are matched according to the shape, size and assembly requirements of the outer circle of the workpiece to ensure precise cooperation and assembly stability between the tooling base and the workpiece.

[0030] A predetermined gap is maintained between the mating surface 11 of the tool base 1 and the first end surface 21 of the workpiece. This gap is set between 0.05 mm and 0.12 mm to ensure flexibility between the tool base 1 and the workpiece 2 and to prevent damage to the thin workpiece caused by an interference fit. Preferably, a gap of 0.1 mm is maintained between the mating surface of the tool base and the first end surface of the workpiece.

[0031] In a preferred embodiment, the hydraulic buffer fixture 3 is configured to be connected to the machine tool tool holder, and a positioning hole 31 is provided on the hydraulic buffer fixture 3. The hydraulic buffer 4 is connected to the positioning hole 31, and the top head 41 of the hydraulic buffer 4 is configured to face the workpiece 2.

[0032] Preferably, there are at least three positioning holes 31, and the three positioning holes 31 are evenly distributed in a circumferential direction along the oil pressure buffer tooling 3. The oil pressure buffer 4 is installed in the positioning hole 31 in a detachable locking manner. The oil pressure buffer 4 can tighten the second end face 22 of the workpiece 2. The oil pressure buffer 4 can reduce the vibration and deformation of the workpiece caused by the cutting force, thereby ensuring the matching accuracy between the tooling base 1 and the workpiece 2.

[0033] In the present invention, the thrust stroke of the plunger 41 of the hydraulic buffer 4 toward the workpiece 2 is adjustable along the tool holder's moving direction. Thus, by moving the tool holder, the thrust stroke of the hydraulic buffer 4 can be adjusted so that the first end surface 21 of the workpiece 2 is flush with the mating surface 11 of the tool base 1.

[0034] The installation process of the clamping fixture for fine turning thin-sheet parts of the utility model is:

[0035] First, place the workpiece 2 into the fixture base 1 and clamp it:

[0036] Based on the 3D digital model of workpiece 2, avoidance position 12 is milled on the fixture base 1. The fixture base 1 is fixed to the machine tool spindle, and the fixture runout is calibrated to ensure its stability during the machining process. The fixture base 1 and the workpiece 2 are matched by outer diameter, and a gap of 0.1mm is maintained between the fixture base 1 and the workpiece 2 to ensure that the workpiece will not be deformed during machining due to overtightening of the fixture.

[0037] Second, adjust the tool holder moving distance to determine the hydraulic buffer ejection stroke:

[0038] The hydraulic buffer fixture 3 is installed on the tool holder, and the tool holder is moved to drive the top heads 41 of the three hydraulic buffers 4 of the hydraulic buffer fixture 3 to press against the second end surface 22 of the workpiece 2;

[0039] Third, loosen the tooling base 1 and re-clamp it:

[0040] Since the surface of the workpiece 2 is pressed tightly by the head 41 of the hydraulic buffer 4, the first end face 21 of the workpiece 2 can be flush with the mating surface 11 of the tooling base 1, so that the turning process can effectively ensure the end face runout requirements. This clamping method can solve the processing of many similar thin-film parts with different specifications, which is very convenient.

[0041] The beneficial effects of the clamping fixture for fine turning thin-sheet parts of the utility model are:

[0042] It is easy to use and clamp, and can effectively ensure the end face runout requirements. This clamping method can meet the processing of many thin-film parts of the same type with different specifications. It is very convenient and can solve the problem of end face runout during processing, ensuring the processing quality of thin-film workpieces.

[0043] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A clamping fixture for fine turning thin-sheet parts, characterized in that: include: A tooling base, a workpiece and an oil pressure buffer tooling, wherein the workpiece has a first end face and a second end face arranged opposite to each other, wherein the first end face faces the mating surface of the tooling base, and the second end face faces the oil pressure buffer tooling, The tooling base is configured to be connected to the main shaft of the machine tool, and the mating surface of the tooling base is milled to form an avoidance position adapted to the workpiece, for mating with the outer circle of the workpiece. The hydraulic buffer fixture is configured to be connected to the machine tool tool holder. A positioning hole is provided on the hydraulic buffer fixture. The hydraulic buffer is connected to the positioning hole. The ram of the hydraulic buffer is configured to face the workpiece. The insertion stroke of the ram of the hydraulic buffer toward the workpiece is configured to be adjustable along the moving direction of the tool holder.

2. The clamping fixture for fine turning thin-film parts according to claim 1, characterized in that: A predetermined gap is left between the matching surface of the tooling base and the first end surface of the workpiece, and the gap is set between 0.05mm and 0.12mm.

3. The clamping fixture for fine turning thin-film parts according to claim 2, characterized in that: A gap of 0.1 mm is maintained between the mating surface of the tooling base and the first end face of the workpiece.

4. The clamping fixture for fine turning thin-film parts according to claim 1, characterized in that: There are at least three positioning holes, and the three positioning holes are evenly distributed in a circumferential direction along the oil pressure buffer tooling.

5. The clamping fixture for fine turning thin-sheet parts according to claim 4, characterized in that: The oil pressure buffer is installed in the positioning hole in a detachable locking manner, and the second end surface of the workpiece can be tightened by the oil pressure buffer.

6. The clamping fixture for fine turning thin-sheet parts according to claim 1, characterized in that: The first end surface of the workpiece can be flush with the matching surface of the tooling base through the oil pressure buffer.

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