Tool for clamping parts
By injecting hydraulic oil on the thin-wall section of the inner sleeve of the tooling, elastic deformation is used to reduce the inner diameter, and clamping and fixing the thin-walled parts is achieved, which solves the problem of difficult to control the clamping force in the prior art, and achieves uniform clamping force and safety of the parts.
Patent Information
- Application Number
- CN202421605591.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-08
AI Technical Summary
In the prior art, when clamping thin-walled parts, it is difficult to control the clamping force, resulting in insufficient force and inability to fix it or excessive force, resulting in deformation of the parts.
A tooling including an outer sleeve and an inner sleeve is adopted. The thin-wall section of the inner sleeve is made of spring steel material. The thin-wall section is deformed and reduced by injection of hydraulic oil through the hydraulic system, thereby realizing the clamping and fixing of the parts. The hydraulic pressure is adjusted by a proportional pressure reducing valve and controlled by a CNC system.
A uniform clamping force for thin-walled parts is achieved, which avoids part deformation, and adapts to different machining types and part characteristics through real-time automatic adjustment of pressure, ensuring the optimal clamping force.
Smart Images
Figure CN222818430U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a tooling fixture for a machining center. Background Art
[0002] In the field of machining, parts need to be clamped and fixed when they are processed. Traditional clamping and fixing methods use mechanical means to clamp, such as vises or triangular chucks, but the deformation is large and it is difficult to control the clamping force. It is difficult to clamp thin-walled parts. If the force is too small, it cannot meet the clamping and fixing requirements, and if the force is too large, it is easy to cause deformation of the parts. Utility Model Content
[0003] In order to solve the problem that it is difficult to clamp thin-walled parts and difficult to control the clamping force in the prior art, the technical solution adopted by the utility model is:
[0004] A tool for clamping parts, including an outer sleeve, an inner sleeve arranged inside the outer sleeve, the two ends of the inner sleeve are sealed with the outer sleeve and the middle part is a thin-walled section, the thin-walled section and the inner wall of the outer sleeve form an annular cavity, the outer sleeve is provided with an oil filling port for injecting hydraulic oil into the annular cavity, the thin-walled section can be deformed under the action of the hydraulic oil to reduce the inner diameter of the thin-walled section of the inner sleeve; also includes a hydraulic system for supplying hydraulic oil to the oil filling port, a proportional pressure reducing valve capable of adjusting the hydraulic pressure is arranged in the hydraulic system, and the proportional pressure reducing valve is controlled by a machine tool numerical control system.
[0005] Furthermore, a flange for fixing the inner sleeve is provided at one end of the inner sleeve, and a group of mounting holes for fixing the tooling are also provided on the flange.
[0006] Furthermore, the inner sleeve is made of spring steel, and the thickness of the thin-walled section is 1.5-2.5 mm.
[0007] The tooling with this structure drives the thin-walled section of the inner sleeve to deform and reduce the inner diameter through the hydraulic system, thereby achieving clamping and fixing of the parts. The hydraulic pressure is adjusted by the proportional pressure reducing valve, which is controlled by the CNC system, so that the deformation of the thin-walled section can be controlled. The pressure change can be automatically adjusted in real time according to the processing type and part characteristics to maintain the optimal clamping force. The circumferential deformation of the thin-walled section is balanced, and the clamping force on the thin-walled parts is more uniform, effectively avoiding deformation of the thin-walled parts. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 It is a schematic diagram of the tooling structure;
[0009] Figure 2 It is the exploded view of the tooling;
[0010] Figure 3It is a sectional view of the tooling with parts installed in the working state;
[0011] Figure 4 Schematic diagram of the inner sleeve structure. DETAILED DESCRIPTION
[0012] like Figure 1 and 2 The tooling shown includes an outer sleeve 1 and an inner sleeve 2, both of which are tubular, and the main body of the inner sleeve 2 is embedded in the outer sleeve 1. Figure 4 As shown, a flange 2-2 is provided at one end of the inner sleeve 2. Figure 3 As shown, one end of the outer sleeve 1 is fixedly connected to the inner sleeve 2 by bolts and a flange 2-2, and both ends of the inner sleeve 2 body are sealed with the inner wall of the outer sleeve 1. Figure 3 As shown, a sealing ring 6 is provided for sealing. Figure 2 The middle part of the inner sleeve 2 is a thin-walled section 2-1, so that Figure 3 As shown, the thin-walled section 2-1 forms an annular cavity 3 with the inner wall of the outer sleeve 1, and an oil filling port 4 is provided on the outer sleeve 1, and the oil filling port 4 is connected to the hydraulic system. A proportional pressure reducing valve 5 is provided in the hydraulic system, and the hydraulic pressure input into the annular cavity 3 can be adjusted by the proportional pressure reducing valve 5, and the proportional pressure reducing valve is controlled by the numerical control system in the machine tool. In the numerical control system, the corresponding parameters are set according to different processing requirements and the wall thickness of the parts to control the proportional pressure reducing valve to adjust the hydraulic pressure of the input oil filling port 4 to achieve the best clamping state. For example, a thin-walled flange part 6 needs to be clamped in the machining center to complete the two processes of end face drilling and flange flat milling. According to the force analysis and calculation of the drilling and milling working conditions, the clamping force requirement is relatively small during the drilling process, and the hydraulic pressure is set to 2.8MPa in the machining program; the clamping force requirement is relatively large during the milling process, and the hydraulic pressure is set to 3.5MPa in the corresponding program. The clamping force is flexibly adjusted and switched according to the processing requirements to effectively avoid the plastic deformation of thin-walled parts under the continuous action of a large clamping force. In order to enable the thin-walled section 2-1 of the inner sleeve 2 to produce elastic deformation, the inner sleeve 2 is preferably made of spring steel, and the thickness of the thin-walled section is 1.5-2.5 mm. When the hydraulic oil is injected into the annular cavity 3 through the hydraulic system, the thin-walled section is driven to produce elastic deformation, thereby reducing the inner diameter of the inner sleeve 2 to clamp and fix the parts. When the hydraulic system is depressurized, the thin-walled section 2-1 can be restored to its initial state through the elastic retraction of the thin-walled section itself, thereby releasing the clamping of the parts.
[0013] Although the inner sleeve 2 is made of spring steel and has good elastic deformation, its deformation is also limited. Therefore, the specifications of the parts and the specifications of the inner diameter of the inner sleeve 2 need to be basically matched, and the gap between them needs to be less than 0.2 mm.
[0014] In order to facilitate the installation of the tooling, mounting holes 2-3 are also provided on the flange for installing the flange into the equipment.
Claims
1. A tool for clamping parts, comprising an outer sleeve (1), characterized in that: An inner sleeve (2) is arranged inside the outer sleeve (1), the two ends of the inner sleeve (2) are sealed with the outer sleeve (1) and the middle part is a thin-walled section (2-1), the thin-walled section (2-1) and the inner wall of the outer sleeve (1) form an annular cavity (3), and an oil injection port (4) is arranged on the outer sleeve (1) for injecting hydraulic oil into the annular cavity (3), and the thin-walled section (2-1) can be deformed under the action of the hydraulic oil to reduce the inner diameter of the thin-walled section (2-1) of the inner sleeve (2); a hydraulic system for supplying hydraulic oil to the oil injection port is also included, and a proportional pressure reducing valve capable of adjusting the hydraulic pressure is arranged in the hydraulic system, and the proportional pressure reducing valve is controlled by a machine tool numerical control system.
2. A tool for clamping parts according to claim 1, characterized in that: A flange (2-2) for fixing the inner sleeve (2) is arranged at one end of the inner sleeve (2), and a group of mounting holes (2-3) for fixing the tooling are also arranged on the flange (2-2).
3. A tool for clamping parts according to claim 1, characterized in that: The inner sleeve (2) is made of spring steel, and the thickness of the thin-walled section (2-1) is 1.5-2.5 mm.