A high efficiency snap ring hydraulic device

Abstract

The present application belongs to the technical field of tooling fixture, and particularly relates to a high-efficiency snap ring hydraulic device, which comprises a fixture base plate, a positioning plate fixed on the fixture base plate through bolts, a circular boss arranged on the positioning plate and used for positioning the position of a part blank, the shape of the fixture base plate avoiding machining tool paths, and a support plate fixed on the fixture base plate through bolts; the position of a positioning block is determined according to the size of the part blank, and a clamping ring part is clamped and pressed by a clamping screw to achieve limiting; a first positioning table and a third positioning table are arranged on the fixture base plate and used for positioning the double lugs on both sides of the clamping ring, and a second positioning table is used for positioning the middle annular part of the clamping ring; a first vertical clamping oil cylinder and a first clamping arm are arranged at the double lug pieces on both sides of the clamping ring respectively; the first clamping arm is pressed on one of the lug pieces; four second vertical clamping oil cylinders and four second clamping arms are arranged at the middle annular part of the clamping ring.

Description

Technical Field

[0001] This invention belongs to the field of tooling and fixture technology, and particularly relates to a high-efficiency hydraulic snap ring device. Background Technology

[0002] Titanium alloy retaining rings physically constrain the rotating parts (such as the rotating swashplate) and non-rotating swashplate of an automatic swashplate, fixing them in the correct position and preventing axial or radial displacement due to vibration or centrifugal force. Through mechanical fixing, load transfer, and vibration control, they ensure precise control and flight safety of the helicopter rotor system. Their design must balance strength, wear resistance, and lightweight, making them a typical example of how "details determine success or failure" in the complex mechanical systems of helicopters. A single raw material costs over 30,000 yuan, and the finished product is worth over 100,000 yuan. Furthermore, this part is a joint type with strict dimensional and geometric tolerance requirements, high machining precision, and a circular shape. The central circular area has poor rigidity during machining, making it extremely difficult to process. Summary of the Invention

[0003] To control part deformation during the CNC finishing process of circlips and ensure dimensional and positional accuracy requirements, it is necessary to also meet the function of automatic pressure plate switching, improve the clamping efficiency and stability of the part. Therefore, a high-efficiency hydraulic device for circlips is proposed.

[0004] A high-efficiency hydraulic clasp device includes a fixture base plate 1, a positioning plate 2 fixed to the fixture base plate by bolts, a round boss on the positioning plate for positioning the workpiece blank, the shape of the fixture base plate being to avoid the machining toolpath, a support plate 4 fixed to the fixture base plate 1 by bolts, and two threaded holes in the middle of the support plate 4 for passing through a set screw 22 and a hexagonal thin nut 23, adjusting the set screw 22 to tighten the clasp part; the position of the positioning block 3 is 0.2mm away from the side where the clasp blank is placed, depending on the size of the workpiece blank; when the set screw 22 tightens the clasp part, the part is just tightly fitted with the positioning block 3, achieving limiting; The fixture base plate 1 is provided with a first positioning platform, a second positioning platform and a third positioning platform; the first positioning platform and the third positioning platform are used to position the double ears on both sides of the retaining ring, and the second positioning platform is used to position the middle circular part of the retaining ring. A first vertical clamping cylinder 6 and a first clamping arm 7 are respectively installed on the double lugs on both sides of the retaining ring; the first clamping arm 7 presses on one of the lugs; four second vertical clamping cylinders 8 and four second clamping arms 9 are installed in the middle ring of the retaining ring.

[0005] Furthermore, the diameter of the round boss is 0.3mm smaller than the size of the part blank.

[0006] Furthermore, by activating the two first vertical clamping cylinders 6, the two first clamping arms 7 clamp and press the ear piece of the retaining ring to clamp and fix it, thus completing the processing of the exposed ear piece part and the ring part of the retaining ring.

[0007] Furthermore, the pressure of the two first vertical clamping cylinders 6 and the two first clamping arms 7 is released, and the quick connector 11 is pressurized. The four second vertical clamping cylinders 8 are activated, and the second clamping arms 9 clamp and press the middle ring part of the retaining ring part, thus completing the ear part that was previously pressed by the two first clamping arms 7.

[0008] Furthermore, after the first clamping arm 7 is depressurized, it flips outward and inserts a pin into the clamping arm 7 to fix it, preventing the first clamping arm 7 from contacting the part; after the pin is pulled out, the valve of the first vertical clamping cylinder 6 is opened, and the first clamping arm 7 re-operates to clamp the part.

[0009] Furthermore, it also includes: a leak-free valve 10; the leak-free valve 10 controls the opening of the vertical clamping cylinder valve by changing the pressure, thereby regulating the flow of the medium and locking the pipeline pressure.

[0010] Furthermore, it also includes: a quick connector 11; the quick connector 11 is used to connect with an external pressure supply system to realize the pressure supply and depressurization operation of the external pressure supply system to the vertical clamping cylinder, as well as to realize the sealing of the internal hydraulic system.

[0011] Furthermore, it also includes a pressure gauge 13, which is installed on the fixture base plate 1 to monitor the system pressure value.

[0012] The positive effects of this invention are: Unlike conventional tooling fixtures that use two pins on one side for positioning, the tooling of this invention employs a positioning method of one pin, one top, and one clamping on one side. A hydraulic system actuates four vertical clamping cylinders in an array, clamping arms clamp the parts, and press the retaining rings to secure them. This achieves automatic positioning, allowing for alternating machining during CNC processing by switching the clamping arms on different paths. This increases the machinable area, enabling full-element machining of the part's upper surface without the need for secondary clamping. Furthermore, the automatic clamping of the clamping blocks after positioning significantly reduces operator steps, improves part clamping efficiency, and better controls clamping force, resulting in more stable part deformation during clamping. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. 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 effort.

[0014] Figure 1 This is a schematic diagram of the part's structure; Figure 2 This is a schematic diagram of a high-efficiency hydraulic snap ring device. Figure 3 This is a clamping diagram for process 1; Figure 4 This is a clamping diagram for process 2; Explanation of reference numerals in the attached figures: Fixture base plate (1), positioning plate (2), positioning block (3), support plate (4), vertical clamping cylinder (6), clamping arm (7), vertical clamping cylinder (8), clamping arm (9), leak-free valve (10), quick connector (11), accumulator (12), hydraulic gauge (13), quick connector (14), anti-rotation pin (17), switch valve (18), eye bolt (19), set screw (22), hexagonal thin nut (23), anti-rotation pin (24), switch valve (25). Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0016] This invention provides a high-efficiency hydraulic circlip device, see reference. Figure 1-4 The fixture includes a base plate 1, a positioning plate 2 fixed to the base plate 1 by bolts, and a circular boss on the positioning plate with a diameter 0.3mm smaller than the part blank size to position the part blank. The bottom support part should avoid the machining toolpath. A support plate 4 fixed to the base plate 1 by bolts has two threaded holes in the middle for inserting set screws 22 and hexagonal thin nuts 23 to adjust the set screws 22 to tighten the retaining ring part. The position of the positioning block 3 should be 0.2mm away from the side where the retaining ring part is placed, depending on the size of the part blank. When the set screws 22 tighten the retaining ring part, the part is tightly fitted with the positioning block 3 to achieve limiting. The first vertical clamping cylinder 6 pressurizes the pipeline and pushes the first clamping arm 7 to rotate, thereby clamping the lugs on both sides of the part.

[0017] The fixture base plate 1 is provided with a first positioning platform, a second positioning platform, and a third positioning platform; the first positioning platform and the third positioning platform are used to position the double ears on both sides of the retaining ring, and the second positioning platform is used to position the middle circular part of the retaining ring.

[0018] A first vertical clamping cylinder 6 and a first clamping arm 7 are respectively installed at the double lugs on both sides of the retaining ring; the first clamping arm 7 presses on one of the lugs; four second vertical clamping cylinders 8 and four second clamping arms 9 are installed at the middle ring of the retaining ring; By actuating the two first vertical clamping cylinders 6, the two first clamping arms 7 clamp and press the lugs of the retaining circumference part to clamp and fix it. In this process 1, the processing of the exposed lug part and the ring part of the retaining circumference is completed; Then, the pressure of the two first vertical clamping cylinders 6 and the two first clamping arms 7 is released to pressurize the quick connector 14. The four second vertical clamping cylinders 8 are activated, and the second clamping arms 9 clamp and press the middle ring part of the retaining ring part, thus completing the processing of the ear part pressed by the two first clamping arms 7 in the previous step 1. Furthermore, the leak-free valve 10 controls the valve opening by changing the pressure, thereby regulating the flow rate of the medium and locking the pipeline pressure.

[0019] Furthermore, the quick connector 11 is used to connect with an external pressure supply system to enable the external pressure supply system to supply and release pressure to the tooling, as well as to seal the internal hydraulic system. Furthermore, the first clamping arm 7 and the second clamping arm 9 are mounted on the fixture base plate 1 to provide pressure holding function for the internal hydraulic system of the tooling, thereby providing a continuous and stable pressure supply to maintain stable system pressure. Furthermore, when the arrow of the switch valve 18 is turned so that the workpiece lug is perpendicular, the first clamping arm 7 releases pressure and pressurizes the quick connector 11. When the system pressure reaches the set pressure, the arrow of the switch valve 18 is turned so that the workpiece lug is parallel, thus achieving system pressure maintenance.

[0020] Furthermore, when the arrow of the switch valve 25 is turned so that the workpiece lug is perpendicular, the second clamping arm 9 releases pressure and pressurizes the quick connector 11. When the system pressure reaches the set pressure, the arrow of the switch valve 25 is turned so that the workpiece lug is parallel, thus achieving system pressure maintenance.

[0021] Furthermore, the action of the first vertical clamping cylinder 6 causes the first clamping arm 7 to clamp. At this time, the arrow of the switch valve 25 is turned so that the workpiece lug is vertical, the second clamping arm 9 is released, and after manually flipping the second clamping arm 9, the four anti-rotation pins 24 are inserted into the second clamping arm 9, so that the annular area of ​​the workpiece pressed by the second clamping arm 9 can be processed to achieve rapid processing.

[0022] Furthermore, the second vertical clamping cylinder 8 is activated to clamp the second clamping arm 9. At this time, the arrow of the switch valve 18 is turned to make the workpiece lug vertical, the first clamping arm 7 is released, and after manually flipping the first clamping arm 7, an anti-rotation pin 17 is inserted into the first clamping arm 7, so that the middle groove area of ​​the workpiece lug pressed by the first clamping arm 7 can be processed to achieve rapid processing.

[0023] Furthermore, after the second clamping arm 9 clamps, the first clamping arm 7 is depressurized. The first clamping arm 7 is then manually flipped outward, and the anti-rotation pin 17 is inserted into the first clamping arm 7 to fix it, preventing the first clamping arm 7 from contacting the tool during machining. After the pin is removed, the hydraulic valve is opened, and the first clamping arm 7 resumes its movement to clamp the part.

[0024] Furthermore, after the first clamping arm 7 clamps, the second clamping arm 9 is depressurized. The second clamping arm 9 is then manually flipped outward, and the anti-rotation pin 25 is inserted into the second clamping arm 9 to fix it, preventing the second clamping arm 9 from contacting the tool during machining. After the pin is removed, the hydraulic valve is opened, and the second clamping arm 9 resumes its movement to clamp the part.

[0025] Furthermore, since the height of the groove between the front and back sides of the workpiece ear is inconsistent, when the workpiece is flipped over and placed in the fixture for processing, the stepped structure of the first clamping arm 7 can meet the clamping and processing requirements of the workpiece flipping over.

[0026] Furthermore, it also includes a pressure gauge 13, which is installed on the fixture base plate 1 to monitor the system pressure value.

[0027] The technical solution of this invention is as follows: A fixture base plate 01 is placed on the worktable of a three-axis vertical CNC machine tool, and pressure plates are used to fix the fixture base plate around the worktable. The part is placed on the positioning boss 2, which fits against the circular hole of the part. After positioning, two parallel set screws 22 are tightened to press against the straightening surface of the retaining ring, making the retaining ring parallel to the X-axis or Y-axis of the machine tool. Pressure is applied through the quick connector 11. When process 1 is executed, the two arrayed first vertical clamping cylinders 6 are activated, and the first clamping arms 7 clamp and press the retaining ring part to clamp and fix it. In this process, the circular part of the retaining ring is processed. Then, pressure is applied via quick connector 14, activating the four second vertical clamping cylinders 8, and the second clamping arms 9 clamp and press the part. The external pipeline then connects to quick connector 11 to release pressure, releasing the part and allowing process 2 to begin. The fixture base plate 1 facilitates machining on a three-axis CNC machine tool. Unlike conventional tooling fixtures with one side and two pins for positioning, this invention uses a one-side, one-pin, one-top, one-clamping positioning method. The hydraulic system activates the four vertical clamping cylinders, clamping the arms and pressing the retaining ring to secure it. This achieves automatic positioning, allowing for alternating machining during CNC machining by switching clamping arms, increasing the machined area and enabling full-element machining of the part's upper surface without secondary clamping. Furthermore, the clamping blocks automatically clamp after positioning, significantly reducing operator steps, improving clamping efficiency, and better controlling clamping force for more stable part deformation.

[0028] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A high-efficiency hydraulic clamping device, characterized in that, The fixture includes a base plate (1), a positioning plate (2) which is fixed to the base plate by bolts. A round boss is provided on the positioning plate to position the blank of the part. The shape of the base plate should avoid the machining toolpath. A support plate (4) is fixed to the base plate (1) by bolts. Two threaded holes are provided in the middle of the support plate (4) to pass through the set screw (22) and the hexagonal thin nut (23). The set screw (22) is adjusted to tighten the retaining ring part. The position of the positioning block (3) is 0.2mm away from the side where the retaining ring is placed, depending on the size of the blank. When the set screw (22) tightens the retaining ring part, the part is just in close contact with the positioning block (3) to achieve the limit. The fixture base plate (1) is provided with a first positioning platform, a second positioning platform and a third positioning platform; the first positioning platform and the third positioning platform are used to position the double ears on both sides of the retaining ring, and the second positioning platform is used to position the middle circular part of the retaining ring; A first vertical clamping cylinder (6) and a first clamping arm (7) are respectively installed on the double ear pieces on both sides of the retaining ring; the first clamping arm (7) presses on one of the ear pieces; four second vertical clamping cylinders (8) and four second clamping arms (9) are installed on the middle ring of the retaining ring.

2. The high-efficiency circlip hydraulic device according to claim 1, characterized in that, The diameter of the round boss is 0.3mm smaller than the size of the part blank.

3. The high-efficiency circlip hydraulic device according to claim 1, characterized in that, By actuating the two first vertical clamping cylinders (6), the two first clamping arms (7) clamp and press the ear piece of the retaining ring to clamp and fix it, thus completing the processing of the exposed ear piece part and the ring part of the retaining ring.

4. The high-efficiency snap ring hydraulic device according to claim 3, characterized in that, Depressurize the two first vertical clamping cylinders (6) and the two first clamping arms (7) to pressurize the quick connector (11). The four second vertical clamping cylinders (8) are activated, and the second clamping arms (9) clamp and press the middle ring part of the retaining ring part, thus completing the ear piece part that was previously pressed by the two first clamping arms (7).

5. A high-efficiency snap ring hydraulic device according to claim 4, characterized in that, After the first clamping arm (7) is depressurized, the first clamping arm (7) is flipped outward and the pin is inserted into the clamping arm (7) to fix it and prevent the first clamping arm (7) from contacting the part; after the pin is pulled out, the valve of the first vertical clamping cylinder (6) is opened and the first clamping arm (7) is activated again to clamp the part.

6. The high-efficiency circlip hydraulic device according to claim 1, characterized in that, Also includes: Leak-free valve (10); the leak-free valve (10) controls the opening of the vertical clamping cylinder valve by changing the pressure, thereby regulating the flow of the medium and locking the pipeline pressure.

7. A high-efficiency circlip hydraulic device according to claim 1, characterized in that, Also includes: Quick connector (11); the quick connector (11) is used to connect with an external pressure supply system to realize the pressure supply and pressure relief operation of the external pressure supply system to the vertical clamping cylinder, and to realize the sealing of the internal hydraulic system.

8. A high-efficiency circlip hydraulic device according to claim 1, characterized in that, It also includes a pressure gauge (13), which is mounted on the base plate (1) of the fixture to monitor the system pressure value.

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