End face stabilizing device for multi-coil compression spring quick compression test

Abstract

A kind of end face stabilizing device of multi-strand helical compression spring quick compression test, including the core rod of quick compression testing machine, the loading boss is arranged on the core rod, the spring positioning sleeve is sleeved on the core rod, the spring positioning sleeve is gap matched with the core rod, the flange is arranged at one end of the spring positioning sleeve, the flange forms annular groove with the spring positioning sleeve, and the cross-sectional diameter of the annular groove is greater than the cross-sectional diameter of multi-strand helical compression spring cable.

Description

Technical Field

[0001] This utility model relates to the field of rapid spring compression testing, specifically to an end face stabilization device for rapid compression testing of multi-strand helical compression springs. Background Technology

[0002] Multi-strand helical compression springs, also known as multi-strand springs, are helical springs made of steel cable (composed of multiple strands of carbon spring steel wire wound together). Compared to single-strand springs, multi-strand springs have better strength and unique vibration absorption and damping effects, and are widely used in aerospace, automotive, and automatic weaponry fields. However, the manufacturing process of multi-strand springs is more complex. Compared to single-strand springs, it is more difficult to grind the ends of multi-strand springs tightly after winding, making it difficult to form a structure similar to the tightly ground ends of single-strand springs. Therefore, under normal circumstances, it is not required that the ends of multi-strand springs be tightly ground flat; their ends can be at any angle, meaning that the ends of multi-strand springs are helical, just like the middle section.

[0003] The rapid compression test of a spring is a test that detects the fatigue decay of the spring force after repeated high-speed compression and release by mounting the spring on the mandrel of a rapid compression testing machine. When the spring is mounted on the mandrel of the rapid compression testing machine, the spring end directly contacts a planar structure (i.e., a loading boss) for limitation before repeated compression and release. However, the ends of multi-strand springs are not tightly ground flat, resulting in arbitrary angles. When the ends contact the loading boss, the instability causes a decrease in the parallelism between the multi-strand spring ends and the mandrel during the rapid compression test. Each time the multi-strand spring is compressed, the ends rub against the loading boss, causing the carbon spring steel wire of the multi-strand spring to wear and break more quickly. Consequently, the rapid compression test cannot accurately reflect the true fatigue decay of the multi-strand spring force. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an end-face stabilization device for rapid compression testing of multi-strand helical compression springs. This device prevents the spring end from rubbing against the loading boss during the rapid compression test, ensuring that the true fatigue attenuation of the spring force of the multi-strand helical compression spring is reflected.

[0005] The technical solution of this utility model is as follows: an end face stabilizing device for a rapid compression test of a multi-strand helical compression spring, including a core rod of a rapid compression testing machine, a loading boss on the core rod, a spring positioning sleeve on the core rod, the spring positioning sleeve and the core rod having a clearance fit, a flange on one end of the spring positioning sleeve, the flange and the spring positioning sleeve forming an annular groove, the cross-sectional diameter of the annular groove being larger than the cross-sectional diameter of the multi-strand helical compression spring steel cable.

[0006] Preferably, the spring positioning sleeve has a through hole extending axially, and the diameter of the through hole is larger than the diameter of the core rod of the spring rapid compression testing machine.

[0007] Preferably, the side of the flange that contacts the loading boss is an arc surface, and the radius of the arc surface of the flange is greater than the radius of the annular groove.

[0008] Preferably, the opening at the other end of the spring positioning sleeve is an arc surface.

[0009] Preferably, the axial length of the spring positioning sleeve is greater than the axial length of the two spiral coils at the end of the multi-strand spiral compression spring.

[0010] Preferably, the spring positioning sleeve is made of heat-treated and strengthened alloy structural steel, wherein the yield strength of the alloy structural steel is greater than or equal to 1320 MPa and the impact toughness is greater than or equal to 80 J / cm. 2 .

[0011] The advantages of this invention are as follows: By fitting a spring positioning sleeve onto the core rod, the end of the multi-strand helical compression spring is placed on the spring positioning sleeve. The spring positioning sleeve replaces the multi-strand helical compression spring in contact with the loading boss. During the rapid compression test, the annular groove of the spring positioning sleeve fits snugly against the un-ground end of the multi-strand helical compression spring, ensuring stable contact between the spring end and the loading boss and accurately reflecting the true fatigue attenuation of the spring force. Furthermore, the spring positioning sleeve separates the end of the multi-strand helical compression spring from the core rod, reducing friction and minimizing the likelihood of cracking due to wear between the multi-strand helical compression spring and the core rod during the rapid compression test. Moreover, this invention uses heat-treated and strengthened alloy structural steel, capable of withstanding 10... 5 It can withstand impact load cycles and reciprocating friction of orders of magnitude or higher without damage, is easy to use, and has good durability. Attached Figure Description

[0012] Figure 1 This is a partial cross-sectional view of the spring positioning sleeve of this utility model.

[0013] Figure 2 This is a side view of the spring positioning sleeve of this utility model.

[0014] Figure 3 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0015] See Figures 1 to 3An end-face stabilization device for a rapid compression test of a multi-strand helical compression spring includes a core rod 3 of a rapid compression testing machine. A loading boss 8 is provided on the core rod 3. A spring positioning sleeve 1 is fitted onto the core rod 3. The spring positioning sleeve 1 has a through hole 2 extending axially. The diameter of the through hole 2 is larger than the diameter of the core rod 3 of the rapid compression testing machine, allowing for a clearance fit between the spring positioning sleeve 1 and the core rod 3. One end of the spring positioning sleeve 1 has a flange 4. The side of the flange 4 that contacts the loading boss 8 is an arc surface, and the radius of the arc surface of the flange 4 is larger than the radius of the annular groove 5. This design aims to reduce stress concentration. The opening 6 at the other end of the spring positioning sleeve 1 is also an arc surface, again aiming to reduce stress concentration. The flange 4 and the spring positioning sleeve 1 form an annular groove 5. The cross-sectional diameter of the annular groove 5 is larger than the cross-sectional diameter of the multi-strand helical compression spring cable 7, ensuring that the end of the multi-strand helical compression spring can be fitted into the annular groove 5 of the spring positioning sleeve, preventing the end of the multi-strand helical compression spring from contacting and rubbing against the loading boss 8. The axial length of the spring positioning sleeve 1 is greater than the axial length of the two spiral coils at the end of the multi-strand spiral compression spring, thus preventing the entire end area of ​​the multi-strand spiral compression spring (i.e., the two spiral coils near the end) from direct contact with the core rod and reducing friction between the end area of ​​the multi-strand spiral compression spring and the core rod. The spring positioning sleeve 1 is made of heat-treated and strengthened alloy structural steel, with a yield strength greater than or equal to 1320 MPa and an impact toughness greater than or equal to 80 J / cm². 2 Ensure the device has sufficient strength to withstand 10 5 It can withstand impact load cycles and reciprocating friction of orders of magnitude or higher without causing damage.

[0016] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An end-face stabilizing device for a rapid compression test of a multi-strand helical compression spring, comprising a core rod (3) of a rapid compression testing machine, wherein a loading boss (8) is provided on the core rod (3), characterized in that: A spring positioning sleeve (1) is fitted on the core rod (3). The spring positioning sleeve (1) is in clearance fit with the core rod (3). A flange (4) is provided at one end of the spring positioning sleeve (1). The flange (4) and the spring positioning sleeve (1) form an annular groove (5). The cross-sectional diameter of the annular groove (5) is larger than the cross-sectional diameter of the multi-strand spiral compression spring steel cable (7).

2. The end-face stabilizing device for rapid compression testing of a multi-strand helical compression spring according to claim 1, characterized in that: The spring positioning sleeve (1) has a through hole (2) extending through it along the axial direction. The diameter of the through hole (2) is larger than the diameter of the core rod (3) of the spring speed compression tester.

3. The end-face stabilizing device for rapid compression testing of a multi-strand helical compression spring according to claim 1, characterized in that: The side of the flange (4) that contacts the loading boss (8) is an arc surface, and the radius of the arc surface of the flange (4) is greater than the radius of the annular groove (5).

4. The end-face stabilizing device for rapid compression testing of a multi-strand helical compression spring according to claim 1, characterized in that: The opening (6) at the other end of the spring positioning sleeve (1) is an arc surface.

5. The end-face stabilizing device for rapid compression testing of a multi-strand helical compression spring according to claim 1, characterized in that: The axial length of the spring positioning sleeve (1) is greater than the axial length of the two spiral coils at the end of the multi-strand spiral compression spring.

6. The end-face stabilizing device for rapid compression testing of a multi-strand helical compression spring according to claim 1, characterized in that: The spring positioning sleeve (1) is made of heat-treated and strengthened alloy structural steel. The yield strength of the alloy structural steel is greater than or equal to 1320 MPa, and the impact toughness is greater than or equal to 80 J / cm. 2 .

Images