Novel C-shaped clamp spring plastic deformation detection tool

Abstract

The utility model discloses a novel C type clamp spring plastic deformation detection frock, including pressure ejector rod, pressure ejector rod is equipped with the clamp spring placement section for placing C type clamp spring and the clamp spring ejection section for pushing out clamp spring, and the outer diameter of clamp spring placement section and clamp spring ejection section gradually reduces from the middle to both ends along the axial direction of pressure ejector rod, and the end face outer diameter of clamp spring placement section is greater than the end face outer diameter of clamp spring ejection section, and the end face of clamp spring placement section is equipped with the positioning structure for radial positioning clamp spring, the taper sleeve, one end of taper sleeve is equipped with the press -fit groove of extending along the axial direction, and the other end is equipped with the ejection groove of extending along the axial direction, and the press -fit groove and ejection groove intercommunication form the detection channel for the passage of clamp spring. The utility model has the beneficial effects that: the technical scheme of the utility model discloses the structure optimization of pressure ejector rod and taper sleeve, solves the problem of the existing frock operation complicated, poor safety, realizes C type clamp spring plastic deformation detection's " high -efficient, safe, precision " integration, has remarkable industrial application value.

Description

Technical Field

[0001] This utility model relates to the field of testing tooling technology, and in particular to a novel C-type snap ring plastic deformation testing tooling. Background Technology

[0002] C-type retaining rings, as common elastic fasteners, are widely used in automobiles, home appliances, and construction machinery. They generate radial clamping force through elastic deformation to achieve axial positioning between the shaft and the hole. In actual assembly, C-type retaining rings require a press-fit fixture for installation. During this process, the retaining ring undergoes a certain amount of plastic deformation. If the deformation exceeds the design threshold, the retaining ring will not provide sufficient clamping force after installation, leading to risks of component loosening, abnormal noise, or even detachment. Therefore, C-type retaining rings must be tested for excessive plastic deformation after press-fitting using specialized tooling before leaving the factory to ensure product quality.

[0003] In the existing technology, the plastic deformation testing fixture for C-type retaining rings usually consists of a "pressure push rod + straight hole fixture": the operator needs to manually put the retaining ring into the straight hole of the fixture, and then push the retaining ring to the bottom of the hole through the pressure push rod to complete the press-fit deformation. Finally, push in the opposite direction to make the retaining ring pop out of the hole, and measure the difference in outer diameter before and after deformation to determine whether it is qualified. However, this type of tooling has the following significant drawbacks: Difficulty in positioning the retaining ring and low inspection efficiency: Because the inner wall of the straight-hole tooling and the retaining ring are clearance-fitted, the retaining ring is prone to tilting due to its own weight or operational deviations when inserted (especially for small-sized retaining rings). This causes the pressure rod to be unable to be pushed to the bottom of the hole in one go, requiring repeated removal and adjustment. A single inspection takes 2-3 minutes, severely restricting production efficiency; Risk of retaining ring ejection and poor safety: After being deformed by pressing, the retaining ring stores elastic potential energy. When ejected, it is prone to fly out of the tooling hole at high speed under the action of elastic force, which may not only cause damage to the retaining ring but also pose a safety hazard of injuring the operator. In actual operation, additional protective equipment is required, further reducing the convenience of operation; Insufficient accuracy in deformation measurement: The inner wall of the straight hole of the existing tooling has no guiding structure. During the pressing process of the retaining ring, uneven force may cause asymmetrical deformation, resulting in a large deviation between the measurement results and the actual assembly conditions, posing a risk of misjudgment.

[0004] Therefore, there is an urgent need to design a new type of tooling that can achieve rapid positioning, safe ejection, and high detection accuracy of snap rings, in order to meet the dual requirements of efficiency and safety for industrial mass production. Utility Model Content

[0005] The main technical problem solved by this utility model is to provide a novel C-type snap ring plastic deformation detection tool, thereby solving one or more of the above-mentioned prior art problems.

[0006] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a novel C-type snap ring plastic deformation detection fixture, the innovation of which lies in: including

[0007] The pressure push rod has a circlip placement section for placing a C-type circlip and a circlip ejection section for ejecting the circlip. The outer diameters of the circlip placement section and the circlip ejection section gradually decrease from the middle to both ends along the axial direction of the pressure push rod. The outer diameter of the end face of the circlip placement section is larger than the outer diameter of the end face of the circlip ejection section. The end face of the circlip placement section is provided with a positioning structure for radially positioning the circlip.

[0008] A tapered sleeve, one end of which is provided with a press-fit groove extending axially, and the other end is provided with an ejection groove extending axially. The press-fit groove and the ejection groove are interconnected to form a detection channel for the circlip to pass through.

[0009] In some embodiments, the positioning structure is at least one positioning post protruding from the end face of the circlip placement section, the outer diameter of the positioning post being adapted to the inner hole of the C-shaped circlip.

[0010] In some embodiments, the inner diameter of the pressing groove gradually decreases from the inlet end to the connection point, while the inner diameter of the ejection groove gradually increases from the connection point to the outlet end.

[0011] In some embodiments, the retaining ring placement section and the retaining ring ejection section of the pressure rod are integrally formed and made of high-strength alloy material.

[0012] In some embodiments, the outlet end of the ejector slot is provided with a buffer cavity for accommodating the ejected snap ring, the inner diameter of which is larger than the maximum inner diameter of the ejector slot.

[0013] In some embodiments, the inlet end of the press-fit groove of the cone sleeve is provided with a guide chamfer, the inclination angle of which is 30° to 45°.

[0014] In some embodiments, the height of the positioning post is 1 / 3 to 1 / 2 of the thickness of the C-type retaining spring, and the top of the positioning post is provided with an arc transition portion.

[0015] In some embodiments, the outer wall of the cone sleeve is provided with anti-slip texture, and the connection between the pressing groove and the ejection groove is provided with an arc transition surface.

[0016] The beneficial effects of this utility model are: by optimizing the structure of the pressure rod and the cone sleeve, this technical solution solves the problems of cumbersome operation and poor safety of existing tooling, and realizes the integration of "high efficiency, safety and precision" in the detection of plastic deformation of C-type snap rings, which has significant industrial application value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0018] Figure 1 This is a schematic diagram of the structure of a novel C-type retaining spring plastic deformation detection tool, showing the pressure rod pressing against the C-type retaining spring.

[0019] Figure 2 This is a schematic diagram of the cone sleeve of a novel C-type snap ring plastic deformation detection fixture according to this utility model.

[0020] Figure 3 yes Figure 2 Cross-sectional view.

[0021] Figure 4 This is a schematic diagram of the structure of a novel C-type retaining ring plastic deformation detection tool according to this utility model, in which the C-type retaining ring is installed in the pressing groove.

[0022] Figure 5 yes Figure 4 Cross-sectional view.

[0023] Figure 6 This is a schematic diagram of the C-type retaining spring ejection structure of a novel C-type retaining spring plastic deformation detection tool according to this utility model.

[0024] Figure 7 yes Figure 6 Cross-sectional view. Detailed Implementation

[0025] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] like Figures 1 to 7 As shown, the present invention includes: a novel C-type snap ring plastic deformation detection fixture, mainly comprising two core components: a pressure rod and a cone sleeve 200. The two components work together to achieve the positioning, pressing deformation and safe ejection functions of the C-type snap ring.

[0027] The pressure rod is a one-piece molded stepped cylindrical structure, made entirely of high-strength alloy material, possessing high hardness and wear resistance, and meeting the service life requirements of tens of thousands of tests. Its structure is divided into a retaining spring placement section 101 and a retaining spring ejection section 102 from the middle to both ends. The outer diameter of both sections gradually decreases along the axial direction, forming a variable diameter structure that is "thicker in the middle and thinner at both ends." Among them:

[0028] The retaining ring placement section 101 has an end face outer diameter D1 designed to be 1.1-1.2 times the original outer diameter of the C-type retaining ring, ensuring that the retaining ring can be smoothly inserted. A positioning post is provided at the center of the end face. The positioning post is cylindrical, with its outer diameter fitting with the inner hole of the retaining ring (gap ≤ 0.1mm). The height is 1 / 3 to 1 / 2 of the retaining ring thickness (for example, when the retaining ring thickness is 2mm, the height of the positioning post is 0.7-1mm). The top end has a rounded transition part with R0.5mm to avoid scratching the inner ring of the retaining ring. The function of the positioning post is to prevent the retaining ring from tilting when it is inserted by radial limiting, solving the problem of repeated adjustments required by existing tooling.

[0029] The outer diameter of the snap ring ejection section 102 is smaller than that of the snap ring placement section 101 (for example, D2 = D1 - 2mm), and the edge of the end face is rounded (R1mm) to ensure that it can smoothly contact the inner ring of the snap ring when ejected, and avoid stress concentration that could cause secondary deformation of the snap ring.

[0030] The tapered sleeve 200 is a hollow stepped sleeve structure made of wear-resistant cast iron. The inner wall is hardened to reduce wear after long-term use. It has a press-fit groove 201 and an ejection groove 202 at its two axial ends, which are connected by a central through hole to form a complete detection channel.

[0031] Press-fit groove 201: Located at the upper end of tapered sleeve 200, the inner diameter of the inlet end matches D1 of the snap ring placement section 101. The inner diameter decreases linearly from the inlet end to the connection point (taper 1:50), simulating the interference fit environment during actual snap ring installation. The inlet end is provided with a 30°~45° guide chamfer (width 2mm) to facilitate the pressure push rod to smoothly enter with the snap ring and reduce assembly resistance.

[0032] Ejection groove 202: Located at the lower end of the tapered sleeve 200, the inner diameter gradually increases from the connecting part to the outlet end (taper 1:100). The outlet end is connected to the buffer cavity, the inner diameter of which is 1.5 times the outer diameter of the snap ring, the depth is 5mm, and the inner wall is covered with a rubber buffer layer (thickness 1mm) to receive the snap ring after it is ejected. The elastic buffering offsets the snap ring ejection kinetic energy, solving the risk of the snap ring flying out and injuring people in the existing tooling.

[0033] Outer wall design: The outer wall of the tapered sleeve 200 is machined with diamond-shaped anti-slip texture (texture depth 0.5mm) to increase grip friction; the connection between the press-fit groove 201 and the ejection groove 202 adopts an R2mm arc transition surface to avoid stress concentration when the retaining spring passes through.

[0034] When placing the retaining ring, its inner hole is fitted into the positioning post of the retaining ring placement section 101 of the pressure push rod. The positioning post ensures that the retaining ring axis is coaxial with the pressure push rod through radial limiting. At this time, the pressure push rod together with the retaining ring is inserted from the inlet end of the pressure mounting groove 201. Due to the precise fit between the positioning post and the inner hole of the retaining ring, the retaining ring will not shift radially and can be pushed to the bottom of the tapered sleeve 200 in one go.

[0035] Compared to existing tooling without a positioning structure 111, this avoids the "jamming-adjustment" cycle caused by the tilting of the retaining spring, reducing the single placement time from 30 seconds to 5 seconds and improving the detection efficiency by more than 80%.

[0036] After the retaining ring is deformed by the press-fit groove 201, the reverse pressure push rod is pushed upward from the bottom of the cone sleeve 200 by the retaining ring ejection section 102, and the retaining ring slides into the buffer cavity along the ejection groove 202; the rubber layer of the buffer cavity absorbs the kinetic energy of the retaining ring popping out, and at the same time the large inner diameter space limits the jumping range of the retaining ring, ensuring that the retaining ring falls smoothly into the cavity; the risk of the retaining ring flying out is completely eliminated. After 1000 simulation tests, the retaining ring is constrained in the buffer cavity. The operator does not need to wear protective gloves, which improves the convenience of operation.

[0037] The tapered design of the press-fit groove 201 simulates actual installation conditions, allowing the retaining ring to undergo controllable plastic deformation as it passes through. The reverse tapered design of the ejection groove 202 prevents secondary damage caused by excessive friction between the retaining ring and the inner wall. The variable diameter structure of the pressure ejector ensures that the retaining ring remains in contact with the end face of the ejector during the pushing and ejecting process, resulting in uniform force distribution. The deformation detection error is reduced from ±0.05mm in the existing tooling to ±0.02mm, meeting the requirements for high-precision detection. The retaining ring surface is free of scratches, increasing the yield rate by 5%.

[0038] The testing process for this technical solution is as follows:

[0039] (1) Initial measurement: Use an outside micrometer to measure the original outside diameter D1 of the C-type snap ring;

[0040] (2) Clamping the snap ring: Insert the snap ring into the positioning pin at the B end of the pressure rod, ensuring that the end face of the snap ring is in contact with the rod;

[0041] (3) Pressing deformation: Hold the cone sleeve 200 (non-slip textured grip), insert the end of the pressure rod with the retaining spring into the inlet of the pressing groove 201, and push it axially to the bottom of the cone sleeve 200. At this time, the retaining spring will undergo plastic deformation under the action of the pressing groove 201.

[0042] (4) Safe ejection: Remove the pressure rod and reverse it. Use end A to push the retaining ring from the bottom of the cone sleeve 200. The retaining ring slides into the buffer chamber along the ejection groove 202.

[0043] (5) Deformation calculation: Take out the snap ring from the buffer cavity, measure the outer diameter D2 after deformation, and calculate the deformation ΔD=D2-D1. If ΔD≤0.1mm (customer required threshold), it is judged as qualified.

[0044] The advantages of this technical solution are:

[0045] Efficiency Improvement: Through the anti-tilt design of the positioning column, the single inspection cycle is shortened from 2 minutes to 40 seconds, and the daily inspection volume is increased from 200 pieces to 600 pieces;

[0046] Enhanced safety: The buffer chamber and rubber layer completely eliminate the risk of the snap ring flying out, reducing the operator's personal injury rate to 0;

[0047] Structural reliability: High-strength materials and wear-resistant treatment ensure that the tooling has a service life of more than 100,000 cycles, and maintenance costs are reduced by 50%;

[0048] Wide compatibility: By replacing the pressure rod and cone sleeve 200 of different sizes, it can be adapted to the detection of C-type snap rings in the range of φ5mm-φ50mm, without the need to customize multiple sets of tooling.

[0049] This technical solution optimizes the structure of the pressure rod and the cone sleeve 200, solving the problems of cumbersome operation and poor safety of existing tooling. It achieves "high efficiency, safety and precision" integration of C-type snap ring plastic deformation detection, and has significant industrial application value.

[0050] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A novel fixture for detecting the plastic deformation of C-type snap rings, characterized in that: include The pressure rod has a retaining spring placement section (101) for placing a C-type retaining spring and a retaining spring ejection section (102) for ejecting the retaining spring. The outer diameters of the retaining spring placement section (101) and the retaining spring ejection section (102) gradually decrease from the middle to both ends along the axial direction of the pressure rod. The outer diameter of the end face of the retaining spring placement section (101) is larger than the outer diameter of the end face of the retaining spring ejection section (102). The end face of the retaining spring placement section (101) is provided with a positioning structure (111) for radially positioning the retaining spring. A tapered sleeve (200) has a pressing groove (201) extending axially at one end and an ejection groove (202) extending axially at the other end. The pressing groove (201) and the ejection groove (202) are interconnected to form a detection channel for the circlip to pass through.

2. The novel C-type snap ring plastic deformation detection fixture according to claim 1, characterized in that: The positioning structure (111) is at least one positioning post protruding from the end face of the circlip placement section (101), and the outer diameter of the positioning post is adapted to the inner hole of the C-shaped circlip.

3. The novel C-type snap ring plastic deformation detection fixture according to claim 1, characterized in that: The inner diameter of the pressing groove (201) gradually decreases from the inlet end to the connection point, and the inner diameter of the ejection groove (202) gradually increases from the connection point to the outlet end.

4. The novel C-type snap ring plastic deformation detection fixture according to claim 1, characterized in that: The retaining ring placement section (101) and retaining ring ejection section (102) of the pressure rod are integrally formed and are made of high-strength alloy material.

5. A novel C-type snap ring plastic deformation detection fixture according to claim 1, characterized in that: The outlet end of the ejector groove (202) is provided with a buffer cavity for accommodating the ejected snap ring, and the inner diameter of the buffer cavity is larger than the maximum inner diameter of the ejector groove (202).

6. The novel C-type snap ring plastic deformation detection fixture according to claim 1, characterized in that: The inlet end of the press-fit groove (201) of the tapered sleeve (200) is provided with a guide chamfer, and the inclination angle of the guide chamfer is 30°~45°.

7. A novel C-type snap ring plastic deformation detection fixture according to claim 2, characterized in that: The height of the positioning post is 1 / 3 to 1 / 2 of the thickness of the C-type retaining spring, and the top of the positioning post is provided with an arc transition part.

8. A novel C-type snap ring plastic deformation detection fixture according to claim 1, characterized in that: The outer wall of the cone sleeve (200) is provided with anti-slip texture, and the connection between the press groove (201) and the ejection groove (202) is provided with an arc transition surface.

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