Inclined pressing clamp for special-shaped sleeve

Abstract

The invention discloses an oblique pressing clamp for a special-shaped sleeve. The special-shaped sleeve oblique pressing clamp comprises a column body, a pressing plate is arranged on the upper side of the column body, a positioning hole is formed in the section of the pressing plate, a threaded hole is formed in the center of the column body, a fastening screw is in threaded connection with the interior of the threaded hole, and the fastening screw penetrates through the pressing plate and fastens the pressing plate to the top end of the column body. Four special-shaped grooves are evenly formed in the upper end of the column body and located on the circumferential face along the circumferential face, and the bottom faces and the lower side faces of the special-shaped grooves are completely attached to the side faces and the bottom face of a to-be-machined part respectively. The process stability can be remarkably improved, a rigid clamping structure and reasonable clamping force distribution are adopted, the cutting vibration amplitude is reduced by 30%-50%, and the surface roughness Ra value can be optimized to 0.8 mu m or below; a compensation gap is reserved in cooperation with the clamp, and the requirement for thermal stability of long-time continuous machining is met. And multiple procedures are integrated, the multiple procedures such as milling, drilling and tapping are completed through one-time clamping, the number of times of transferring between the procedures is reduced, and accumulated errors caused by repeated positioning and clamping are reduced.

Description

Technical Field

[0001] This invention relates to the field of machining clamping technology, specifically to a non-circular sleeve oblique pressing clamp. Background Technology

[0002] In modern high-end manufacturing, as products develop towards lightweight, high performance and functional integration, a large number of complex "irregular parts" have emerged. These parts usually have one or more of the following characteristics: irregular geometry, no stable reference surface, thin walls that are easily deformed, low material rigidity (such as composite materials or flexible parts), or free-form surfaces.

[0003] The emergence of these parts poses a severe challenge to the fundamental "clamping" process in traditional manufacturing. Fixtures are the bridge connecting workpieces and machine tools, and their core task is to accurately, stably, and reliably position and clamp workpieces to ensure processing quality. However, traditional fixtures often fall short when dealing with irregularly shaped parts, becoming a bottleneck that restricts production efficiency, processing accuracy, and even product innovation.

[0004] Please see Figures 1-2 This part has an irregularly shaped positioning surface that is too small, so it relies heavily on manual adjustment during processing, making it difficult to meet the positioning requirements of high-precision machining. In addition, because the annular groove of this part requires five-axis machining, the processing cost is high. The product has many processes, including milling, drilling, tapping, etc., which makes the processing complex and time-consuming. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a non-standard sleeve inclined clamp, including a column, a pressure plate provided on the upper side of the column, a positioning hole provided on the cross section of the pressure plate, a threaded hole provided in the center of the column, a fastening screw threaded into the threaded hole, the fastening screw passing through the pressure plate and fastening the pressure plate to the top of the column; four non-standard grooves are evenly provided on the upper end of the column and on the circumferential surface along the circumferential direction, the bottom surface and lower side surface of the non-standard grooves are completely fitted with the side surface and bottom surface of the part to be processed, respectively; a positioning post protrudes from the middle position of the non-standard groove.

[0006] As a preferred embodiment of the present invention, the positioning column is tilted, and its tilting direction is from bottom to top, getting further and further away from the axis of the column.

[0007] As a preferred embodiment of the present invention, after clamping is completed, the pressure plate is attached to the top surface of the part to be processed and downward pressure is applied to it.

[0008] The beneficial effects of this invention are as follows: I. This invention significantly improves process stability: the rigid clamping structure and reasonable clamping force distribution reduce cutting vibration amplitude by 30%-50%, and the surface roughness Ra value can be optimized to below 0.8μm; the fixture has a pre-reserved compensation clearance to meet the thermal stability requirements of long-term continuous machining. Multi-process integration: milling, drilling, tapping and other processes can be completed in one clamping, reducing the number of transfers between processes and reducing the cumulative error caused by repeated positioning and clamping.

[0009] Second, this invention can clamp 4 workpieces at a time. Combined with the fast positioning pressure plate, the clamping time is reduced by 66% compared with traditional fixtures (only 1 / 3 of the traditional time); ultra-precision positioning: through the high rigidity of the fixture body and the precision guide element, the positioning accuracy reaches ±0.01mm, which meets the IT5-IT6 tolerance requirements; the fixed positioning reference surface and hole shaft matching design completely eliminates the error of manual centering and improves the consistency of processing. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] Figure 1 This is a schematic diagram of the workpiece shape for which this invention is applied.

[0012] Figure 2 This is a schematic diagram of the workpiece sectioning for the present invention.

[0013] Figure 3 This is a schematic diagram of the clamping assembly after the fastening screw has been removed according to the present invention.

[0014] Figure 4 This is a front view of the figure of the present invention.

[0015] Figure 5 for Figure 4 CC cross-section.

[0016] In the diagram: 1. Column; 11. Irregular groove; 111. Positioning post; 2. Pressure plate; 3. Fastening screw; A. Surface A; B. Surface B; a. Surface a; b. Surface b. Detailed Implementation

[0017] The embodiments of the present invention are described in detail below.

[0018] See Figures 1-5A non-circular sleeve inclined clamp includes a column 1, a pressure plate 2 on the upper side of the column 1, a positioning hole on the cross section of the pressure plate 2, a threaded hole 11 at the center of the column 1, and a fastening screw 3 internally threaded into the threaded hole 11. The fastening screw 3 passes through the pressure plate 2 and fastens the pressure plate 2 to the top of the column 1. Four non-circular grooves 11 are evenly distributed along the circumference of the upper end of the column 1. The bottom and lower sides of the non-circular grooves 11 are completely fitted with the side and bottom surfaces of the workpiece to be processed, respectively. A positioning post 111 protrudes from the middle of the non-circular groove 11. The positioning post 111 is inclined, and its inclination direction is from bottom to top, getting further away from the axis of the column 1. After clamping, the pressure plate 2 is in contact with the top surface of the workpiece to be processed and applies downward pressure to it.

[0019] The specific clamping process is as follows: (See attached document) Figures 1-5 First, slide the workpiece into the positioning hole along the positioning post 111 to ensure the hole-shaft clearance fit accuracy is such as H7 / g6. Use the cylindrical surface of the positioning post 111 to restrict the workpiece's X / Y degree of freedom.

[0020] Reference surface fit: Then adjust the workpiece so that the A surface of the workpiece is fully fitted with the a surface of the irregular groove 11 and the B surface of the workpiece is fully fitted with the b surface of the irregular groove 11. By restricting the Z-direction translation and the rotational degree of freedom around the X / Y axis through surface contact, a variant of the "one surface and two pins" positioning system (i.e., one hole + two surfaces) is formed, which makes the clamping reliable and the positioning accuracy high.

[0021] Height positioning: By tightening the fastening screw 3, the pressure plate 2 moves downward to apply downward pressure to the workpiece, while also controlling the Z-axis height of the workpiece to ensure height consistency when multiple workpieces are clamped.

[0022] It should be noted that when tightening the fastening screw 3, an appropriate clamping force should be set according to the workpiece material (usually 1.5-2 times the cutting force) to prevent workpiece deformation or vibration.

[0023] After clamping, the parts can be processed. Multiple processes such as milling, drilling, and tapping can be completed in one clamping, which is convenient and fast, and saves the error accumulation caused by multiple clamping.

[0024] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention, which are still covered within the protection scope of the present invention.

Claims

1. A non-circular sleeve inclined clamp, characterized in that, Includes a column (1), a pressure plate (2) is provided on the upper side of the column (1), a positioning hole is provided on the cross section of the pressure plate (2), a threaded hole (11) is provided in the center of the column (1), a fastening screw (3) is connected to the threaded hole (11) by internal thread, the fastening screw (3) passes through the pressure plate (2) and fastens the pressure plate (2) to the top of the column (1); The upper end of the column (1) and located on the circumferential surface are provided with four irregular grooves (11) evenly distributed along the circumferential surface. The bottom surface and lower side surface of the irregular grooves (11) are completely fitted with the side surface and bottom surface of the part to be processed, respectively. A positioning post (111) protrudes from the middle of the irregular groove (11).

2. The oblique pressing clamp for irregular sleeves as described in claim 1, characterized in that, The positioning column (111) is tilted, and its tilt direction is from bottom to top, getting further and further away from the axis of the column (1).

3. The oblique pressing clamp for irregular sleeves as described in claim 1, characterized in that, After clamping, the pressure plate (2) is attached to the top surface of the part to be processed and applies downward pressure to it.

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