TH70856B - Coil springs for vehicle support systems and methods for their manufacture. - Google Patents

Abstract

DC60 spring wire (20) with a hardness of 50 to 56 HRC is treated with a spraying process. With a first and second (S6) (S7) shot within the warm operating temperature range of 150 to 350 ° C in the first (S6) finishing process, the first pellet size is 1.0 mm or greater. Will be used in the second shot (S7) finishing process. Smaller pellet sizes than first shot are used by these pelletizing processes (S6) (S7). Compressed residual stress is transmitted to the spring wire (20), spring wire (20) as well as the residual stress enhancer (T1). The maximum residual stress (T3) and residual stress reduction (T4) in the residual stress reduction (T4) section (B), including the compressive residual stress, whose size is The magnitude of the compressive residual stress on the spring wire surface (20) is located at a certain position at the depth. Greater than the allowable pit depth (Rmax)

Claims (7)

Disclaimer (all) which will not appear on the advertisement page: Amendment 30/10/2018 Page 1 of 2 pages Disclaimer 1. Coil springs for vehicle load-bearing systems made with springs where The Compressed residual throttle is delivered by shot blasting. Coil spring included Residual stress increment (T1) where the absolute value of the compressive residual stress is increased. From the surface of the spring (20) in the direction of depth Where the residual stress increment (T1) has a tip which is At the residual stress increment (T1) furthest from the spring wire surface (20), the maximum residual stress from the first shot finish (T3) where the absolute value Of the compression residual stress is the highest And which occurs in the region of the spring at a depth At more than half the permissible pit depth (Rmax) of the spring wire (20), the maximum residual stress from the second pellet mill (h) arising in The area of the spring wire at a depth less than half the allowable pit depth (Rmax) and which is arranged Next to that end of the residual stress increment (T1) in the direction of depth. Where the magnitude of the value The absolute compressive residual stress of the maximum of the residual stress from spraying with The second shot (h) is greater than the absolute value of the compression residual stress of the residual stress increment (T1), while the partial residual stress arising between the maximum residual stress from the spray. The first shot (T3) and the highest residual stress from the second shot (h) where the absolute value of the compression residual stress of the partial stress fraction is below the absolute value. Of the compressive residual stress of the highest of the first-shot residual stress (T3) and the absolute value of the compressive residual stress of the maximum second-shot residual stress (h) and the reduction of the residual stress. (T4) where the absolute value, the compressive residual stress is reduced from the First-shot residual stress (T3) in the direction of the depth of the spring wire, where the residual stress (T4) is reduced, including the region (B) at the excess of the depth of Permissible hole (Rmax) of spring wire (20) in which the size of the compressive stress is equal to that of Compressive residual stress on the spring wire surface (20) -------------------------------------- -------------------------------------------------- ------------ ------ 21/11/2017 ------ (OCR) Page 1 of 2 pages Disclaimer 1. Coil spring for weight support system. Of vehicles made of springs, where Compressive residual stress is transmitted by shot blasting. Coil spring included Residual stress increment (T1) where the absolute value of the compressive residual stress is increased. From the surface of the spring (20) in the direction of depth Where the residual stress increment (T1) has an end. At the residual stress increment (T1) furthest from the surface of the spring (20), the maximum residual stress from spraying is applied first (T3) where the absolute value Of the compression residual stress is the highest And arose in the area of the spring at a depth At more than half the permissible pit depth (Rmax) of the spring wire (20), the maximum fraction of the second pelletizing residual stress (h) occurred in the region of the spring wire at a depth less than half the Allowable pit depth (Rmax) and which is located next to that end of the residual stress enhancer (T1) in the depth direction. Where the size of The absolute value of the compressive residual stress of the maximum of the spray residual stress with The second shot (h) is greater than the magnitude of the absolute value of the compressive stress of the residual stress increment (T1), while the partial residual stress arising between the maximum residual stress from the With the first shot (T3) and the maximum residual stress from the second shot (h), the absolute value of the compressive residual stress of the stress fraction was lower than the absolute value of Compressive residual stress of the maximum fraction of the spray residual stress (T3) and the absolute value of the compression residual stress of the maximum spray residual stress. Dressed with a second shot (h) and a decrease in the residual stress (T4), the absolute value, the compressive residual stress is reduced from the section. The maximum of residual stress from first-shot blasting (T3) in the direction of the spring wire, where the residual stress (T4) is reduced, including the region (B), where the excess depth of the Permissible hole (Rmax) of spring wire (20) in which the size of the compressive stress is equal to that of Compressive residual stress on the surface of the spring wire (20), page 2 of the number 2, page 2.Coil spring for vehicle load support system according to claim 1, where the permissible pit depth (Rmax) is 0.25. Mm and the compressive residual stress of at least -400 MPa is transmitted to a region from the surface of the spring (20) to a position at a depth of Hole tolerance (Rmax) 3. Coil spring for vehicle load support system according to claim 2, where the spring hardness (20) is 50 to 56 HRC ----------- - 1.Coil springs for vehicle support systems made with spring wire where the The compression throttle is delivered by spraying with a blast of paint onto it that has a unique feature that includes Residual stress increase where the compression residual stress is increased from the surface of the Spring in the depth direction Residual stress peak where the compression residual stress is greatest and the residual stress reduction where the compression residual stress is reduced from the maximum Residual stress in the direction of the spring's depth, where in the reduction of the residual stress Part containing the compressive residual stress, which size It is equal to the magnitude of the compression residual stress on the surface of the spring wire at a certain position. Where the depth is greater than the allowable pit depth of the spring wire 2.Coil springs for vehicle support systems in accordance with claim 1, where the permissible hole depth of the spring wire is 0.25 mm and the compressive residual stress of -400 MPa (mpa) or more is Sent to a certain area from the surface of the spring to the position One at the allowable pit depth 3.Coil springs for vehicle support systems according to claim 2 where the spring hardness is 50 to 56 HRC. 4. Methods for manufacturing coil springs for vehicle support systems with Peculiarities that include Bending process for forming a spring steel wire made up of helical shape, a first shot blasting process, which produces a residual stress. The compression to the spring is performed by the first shot with a pellet size of 1.0 mm or more and the second shot applied to the spring. A second shot smaller than the first shot after the first finishing process, where by the first spray. And the second shot blasting process increases the residual stress where the compressive stress increases from the spring surface. In the direction of depth The maximum fraction of the residual stress where the compression residual stress is greatest and the reduction of the residual stress where the compression residual stress is reduced from the maximum residual stress. In the direction of the spring wire depth Was made, and in reducing the residual stress The first part containing the compression residual stress, which size Its size is equal to the magnitude of the compression residual stress on the surface of the spring wire being produced at the position. One where a certain depth is greater than the allowable hole depth of the spring wire. 5. Manufacturing method according to claim 4, where the first spray and second spray. Performed in the condition where the spring is maintained at an operating temperature of 150 to 350 ° C 6. Manufacturing method according to claim 5, where the operating temperature in the first pelletizing process is higher than the operating temperature. In the process of spraying the second shot. 7.Manufacturing method according to claim 6, where the kinetic energy of the first shot in the process of spraying with the first shot is greater. Second shot kinetic energy in the second shot blasting process