CN105252227A - Manufacturing process capable of improving stability of torsion bar spring - Google Patents
Manufacturing process capable of improving stability of torsion bar spring Download PDFInfo
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- CN105252227A CN105252227A CN201510817063.0A CN201510817063A CN105252227A CN 105252227 A CN105252227 A CN 105252227A CN 201510817063 A CN201510817063 A CN 201510817063A CN 105252227 A CN105252227 A CN 105252227A
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention relates to a manufacturing process capable of improving stability of a torsion bar spring. The manufacturing process sequentially comprises the following steps: a blanking process, a rough turning process, a thermal treatment process, a precision grinding process and a linear cutting process, wherein a heating pre-twisting process and a thermal aging treatment process are carried out between the precision grinding process and the linear cutting process. According to the manufacturing process, heating pre-twisting is carried out by three times for enabling a twisting angle of the torsion bar spring to be 90-100 degrees, and then, the temperature is slowly raised to 110-120 DEG C and kept for two hours, so that activeness of molecules inside the torsion bar spring is increased, realignment of crystalline grains is facilitated, compactness of molecules on the surface of the torsion bar spring is increased, and acting force among the molecules is improved, thereby achieving the purposes of reducing a residual deformation angle and improving a torque value; the thermal aging treatment process is carried out, and the torsion bar spring is placed into a thermal ageing furnace in a no-load mode, slowly raised to 180-200 DEG C and kept for two hours, so that unstable residual stress inside the heated and pre-twisted torsion bar spring can be removed, and therefore, the stability and the torque of the torsion bar spring are improved.
Description
Technical field
The present invention relates to torsion-bar spring processing and manufacturing technical field, particularly relate to a kind of manufacturing process that can improve torsion-bar spring stability.
Background technology
Torsion-bar spring is as a kind of flexible member, be widely used in the field such as automobile, aviation, because the structure of torsion-bar spring is simple, lighter weight, and the elasticity that unit volume stores can be larger, also be applied to some have folding and launch in the product of function, especially large at folding angles, development rate is fast, synchronously require in high, that expansion kinetic energy is large product, usual employing torsion-bar spring provide kinetic energy realize product folding, launch the narrow and small product of function, particularly inner space is applied more extensive.
The torsion-bar spring serviceability that current employing traditional handicraft manufactures is unstable, remaining torsional angle increases gradually along with the increase of the access times of torsion-bar spring, and torsion-bar spring generation plastic deformation can be caused, the expansion kinetic energy causing torsion-bar spring to provide is not enough, product cannot launch or can not synchronous expansion, has a strong impact on product serviceability.
Summary of the invention
The object of the invention is to solve above-mentioned prior art Problems existing, and then a kind of manufacturing process that can improve torsion-bar spring stability is provided, improve torsion-bar spring torque value, and increased substantially the stability of torsion-bar spring; The torsion-bar spring adopting manufacturing process of the present invention to manufacture, can make torsion-bar spring after the distortion storage that long-term windup-degree is greater than 78 °, after each use, the difference of remnants deform angle is at about 1 °, and torque value keeps being more than or equal to 80Nm.
Technical scheme of the present invention:
A kind of manufacturing process that can improve torsion-bar spring stability, comprise following operation successively: blanking procedure, rough turn operation, heat treatment step, precision grinding process, Linear cut operation, between described operation and described Linear cut operation, carry out heat pretwist operation, heat aging treatment process;
(1) first time heats pretwist operation: load pretwist, by torsion bar spring tension angle to 90 °-100 °, and is slowly warming up to 110-120 DEG C, keeps 2 hours; With stove cooling, unloading;
(2) second time is heated pretwist operation: again load pretwist, by described torsion bar spring tension angle to 90 °-100 °, and is slowly warming up to 110-120 DEG C, keeps 2 hours; With stove cooling, unloading;
(3) third time heats pretwist operation: again load pretwist, by described torsion bar spring tension angle to 90 °-100 °, and is slowly warming up to 110-120 DEG C, keeps 2 hours; With stove cooling, unloading;
(4) heat aging treatment process: described torsion-bar spring is put into heat aging stove, is slowly warming up to 180 ~ 200 DEG C, keeps 2 hours, cools with stove.
Further, by torsion bar spring tension angle to 90 ° ± 1 ° in described step (1), and 110 DEG C are slowly warming up to.
Further, by torsion bar spring tension angle to 90 ° ± 1 ° in described step (2), and 110 DEG C are slowly warming up to.
Further, by torsion bar spring tension angle to 90 ° ± 1 ° in described step (3), and 110 DEG C are slowly warming up to.
Further, in described step (4), heat aging stove is put in described torsion-bar spring zero load, be slowly warming up to 180 DEG C.
Further, after described Linear cut operation, also comprise product inspection operation and warehouse-in operation successively.
The present invention has following beneficial effect: the manufacturing process that can improve torsion-bar spring stability disclosed by the invention, pretwist operation of carrying out heating, judges operation, heat aging treatment process between fine grinding with Linear cut step; By heating to torsion-bar spring, the molecule activity of torsion-bar spring inside can be increased, be conducive to crystal grain and rearrange; Pretwist can make torsion-bar spring internal grain arrange along torsion bar spring tension direction, add the compactness of torsion-bar spring surface molecular, improve intermolecular force, the top layer of sclerosis torsion-bar spring, the state making torsion-bar spring crystal grain and lattice when windup-degree is greater than use angle is stable, thus reaches the object reducing remnants deform angle, improve torque value; Heat aging process can remove the inner unstable residual stress of torsion-bar spring after pretwist of heating, thus improves stability and the moment of torsion of torsion-bar spring.The present invention by torsion bar spring tension angle to 90 °-100 °, and is slowly warming up to 110-120 DEG C by three times, keeps after 2 hours, and heat aging stove is put in torsion-bar spring zero load, be slowly warming up to 180 ~ 200 DEG C, keep 2 hours; The torsion-bar spring using manufacturing process of the present invention to manufacture, can make torsion-bar spring after the distortion storage that long-term windup-degree is greater than 78 °, and each residual deformation angle difference of rear torsion-bar spring that uses is at about 1 °, and torque value is more than or equal to 80Nm.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Fig. 1 is the torsion-bar spring structural representation being applicable to folding and expanding series products;
Fig. 2 is the windup-degree of torsion-bar spring and torque value graph of a relation that manufacture through traditional handicraft;
Fig. 3 is the windup-degree of torsion-bar spring and torque value graph of a relation that manufacture through embodiment of the present invention manufacturing process;
Detailed description of the invention
Below with reference to accompanying drawing, the present invention is described in detail.
The present invention is to be applied in circular solids torsion-bar spring that is folding and that launch in product, because function that is folding, that launch product needs, therefore require that torsion-bar spring need be in the folded state of 78 ° of torsional angles for a long time, and need to provide torque value be more than 80Nm folding-launch potential energy, and require product can launch to put in place, rapidly.
Through the torsion-bar spring that traditional handicraft manufactures, comprise blanking procedure, rough turn operation, heat treatment step, precision grinding process, Linear cut operation, product inspection operation, warehouse-in operation;
Blanking procedure: the material selecting the applicable manufacture torsion-bar spring such as such as 40Cr structural steel, metal bar material is carried out cutting by the model specification of torsion-bar spring, the linearity of tubing ensures raw material outer surfaces not damaged, inside pipe wall non-corroding, not damaged, within will ensure 0.2/1000mm.
Rough turn operation: the burr at the metal bar material two ends after excision blanking procedure, turnery processing is carried out to metal bar material, meanwhile, concentrates for avoiding stress and ensure the stress-bearing capability of ends of torsion bar spring, positive hexagonal structure is processed at the two ends of metal bar material, forms torsion-bar spring structure as shown in Figure 1.
Heat treatment step: adopt quenching, tempering, blasting process to heat-treat the torsion-bar spring after rough turn processing successively, certainly, above-mentioned heat treatment mode also can adjust according to the difference of torsion-bar spring material, its heat treated mode is all that those skilled in the art just can obtain without the need to spending creative work, and in this not go into detail.
Precision grinding process: fine grinding process is carried out to the torsion-bar spring after heat treatment, form accuracy, dimensional accuracy and surface roughness that torsion-bar spring reaches required can be ensured.
Linear cut operation: for meeting product size and accuracy of manufacture requirement, adopts wire cutting technology to process torsion-bar spring.
Although adopt the torsion-bar spring of above-mentioned manufacturing process manufacture can meet general performance requirement, be difficult to the performance requirement meeting above-mentioned folding and expanding series products.
As shown in Figure 2, can find out in the windup-degree of the torsion-bar spring of traditional handicraft manufacture and the graph of a relation of torque value, the windup-degree reference axis starting point that first time is reversed, second time is reversed, third time is reversed, the 4th time is reversed is inconsistent, it is 0 ° that first time reverses corresponding windup-degree starting point, it is 15 ° that second time reverses corresponding windup-degree starting point, it is 25 ° that third time reverses corresponding windup-degree starting point, and the 4th time is reversed corresponding windup-degree starting point is 31 °; Can draw thus, after first time is reversed, torsion-bar spring creates the remnants deform angle of 15 °; After second time is reversed, torsion-bar spring creates the remnants deform angle of 25 °; After third time is reversed, torsion-bar spring creates the remnants deform angle of 31 °; After each torsion, the difference of remnants deform angle changes greatly, unstable properties.
And can draw further from Fig. 2, when first time is reversed, when windup-degree reaches 105 ° of (remnants deform angle is 0 °) left and right, torsion-bar spring generation fracture failure; When second time is reversed, when windup-degree reaches 120 ° of (remnants deform angle is 15 °) left and right, torsion-bar spring generation fracture failure; When reversing for the third time, when windup-degree reaches 130 ° of (remnants deform angle is 25 °) left and right, torsion-bar spring generation fracture failure; When reversing for the 4th time, when windup-degree reaches 136 ° of (remnants deform angle is 31 °) left and right, torsion-bar spring generation fracture failure; But because the torsion angle values that first time is reversed, second time is reversed, third time is reversed, the 4th time is reversed all comprises remnants deform angle, so the ultimate torsional angle degree of torsion-bar spring is about 105 °.
The curve that torsion-bar spring first time shown in Fig. 2 is reversed, the remnants deform angle of torsion-bar spring is 0 °, and the torque value of torsion-bar spring increases along with the increase of windup-degree, when windup-degree reaches 105 °, torsion-bar spring generation fracture failure, maximum torque 80Nm corresponding with it; When the windup-degree of torsion-bar spring is 78 °, torque value corresponding is with it about 75Nm, cannot meet the performance requirement of folding and expanding series products.
When reversing from torsion-bar spring second time, corresponding curve can draw, owing to creating the remnants deform angle of 15 ° after first time torsion, need to reverse on the remnants deform angle basis of 15 ° so second time is reversed, (remnants deform angle 15 ° is comprised when the windup-degree of torsion-bar spring is 93 °, namely actual windup-degree is 78 °) time, torque value corresponding is with it about 75Nm, cannot meet the performance requirement of folding and expanding series products.
When reversing from torsion-bar spring third time, corresponding curve can draw, owing to creating the remnants deform angle of 25 ° after second time torsion, need to reverse on the remnants deform angle basis of 25 ° so third time is reversed, (remnants deform angle 25 ° is comprised when the windup-degree of torsion-bar spring is 103 °, namely actual windup-degree is 78 °) time, torque value corresponding is with it about 70Nm, cannot meet the performance requirement of folding and expanding series products.
When reversing for the 4th time from torsion-bar spring, corresponding curve can draw, owing to creating the remnants deform angle of 31 ° after third time torsion, need to reverse on the remnants deform angle basis of 31 ° so reverse for the 4th time, (remnants deform angle 31 ° is comprised when the windup-degree of torsion-bar spring is 109 °, namely actual windup-degree is 78 °) time, torque value corresponding is with it about 70Nm, cannot meet the performance requirement of folding and expanding series products.
When more than only giving torsion-bar spring four torsions, the curve relation figure of windup-degree and torque value, but the increase along with torsion bar spring tension number of times can be found from Fig. 2, residual deformation angle also increases thereupon gradually, and the torque value of correspondence reduces gradually, so when torsion-bar spring occur the 5th time to the N time time, torque value still cannot meet the folded state that folding and expanding series products is in 78 ° of torsional angles for a long time, after each use, the difference of remnants deform angle at about 1 °, and need to provide torque value be more than 80Nm folding-launch the performance requirement of potential energy.
The manufacturing process of torsion-bar spring stability can be improved disclosed in the embodiment of the present invention, comprise blanking procedure, rough turn operation, heat treatment step, precision grinding process, pretwist operation of heating, judge operation, heat aging treatment process, Linear cut operation, wherein blanking procedure, rough turn operation, heat treatment step, precision grinding process, Linear cut operation are identical with above-mentioned traditional manufacturing process, do not repeat them here.
The present embodiment carries out heat pretwist operation, heat aging treatment process between precision grinding process and described Linear cut operation, and pretwist operation of wherein heating needs to carry out three times:
(1) first time heats pretwist operation: by torsion bar spring tension angle to 90 °-100 °, and be slowly warming up to 110-120 DEG C, keep 2 hours; With stove cooling, unloading;
(2) second time is heated pretwist operation: again by torsion bar spring tension angle to 90 °-100 °, and be slowly warming up to 110-120 DEG C, keep 2 hours; With stove cooling, unloading;
(3) third time heats pretwist operation: again by torsion bar spring tension angle to 90 °-100 °, and be slowly warming up to 110-120 DEG C, keep 2 hours; With stove cooling, unloading;
(4) heat aging treatment process: torsion-bar spring is put into heat aging stove, is slowly warming up to 180 ~ 200 DEG C, keeps 2 hours, cools with stove.
As shown in Figure 3, adopt in the windup-degree of torsion-bar spring of embodiment of the present invention manufacturing process manufacture and the graph of a relation of torque value and can find out, first time torsion curve, second time torsion curve, third time the torsion curve step (1) that is the present embodiment, step (2), pre-line of torsion of heating corresponding to step (3), the 4th torsion curve is the curve of the torsion-bar spring real work manufactured through the present embodiment manufacturing process; It is 0 ° that first time reverses corresponding windup-degree starting point, and it is 30 ° that second time reverses corresponding windup-degree starting point, and it is 35 ° that third time reverses corresponding windup-degree starting point, and the 4th time is reversed corresponding windup-degree starting point is 36 °; Can draw thus, after first time is reversed, torsion-bar spring creates the remnants deform angle of 30 °; After second time is reversed, torsion-bar spring creates the remnants deform angle of 35 °; After third time is reversed, torsion-bar spring creates the remnants deform angle of 36 °.
And can draw further from Fig. 3, when first time is reversed, when windup-degree reaches 105 ° of (remnants deform angle is 0 °) left and right, torsion-bar spring generation fracture failure; When second time is reversed, when windup-degree reaches 135 ° of (remnants deform angle is 30 °) left and right, torsion-bar spring generation fracture failure; When reversing for the third time, when windup-degree reaches 135 ° of (remnants deform angle is 35 °) left and right, torsion-bar spring generation fracture failure; When reversing for the 4th time, when windup-degree reaches 138 ° of (remnants deform angle is 36 °) left and right, torsion-bar spring generation fracture failure; But because the torsion angle values that first time is reversed, second time is reversed, third time is reversed, the 4th time is reversed all comprises remnants deform angle, so the ultimate torsional angle degree of torsion-bar spring is about 105 °.
When reversing from torsion-bar spring first time, corresponding curve can draw, namely the first time of step (1) heats pretwist, the remnants deform angle of torsion-bar spring is 0 °, the torque value of torsion-bar spring increases along with the increase of windup-degree, when windup-degree reaches 105 °, torsion-bar spring generation fracture failure, maximum torque 80Nm corresponding with it; When the windup-degree of torsion-bar spring is 78 °, torque value corresponding is with it about 75Nm, now obviously cannot meet the performance requirement of folding and expanding series products, therefore, when first time heats pretwist, by torsion bar spring tension angle to 90 °-100 °, and be slowly warming up to 110-120 DEG C, keep 2 hours; With stove cooling, unloading.
When reversing from torsion-bar spring second time, corresponding curve can draw, namely the second time of step (2) is heated pretwist, after first time heats pretwist, torsion-bar spring defines the remnants deform angle of 30 °, so second time is heated, pretwist needs to reverse on the remnants deform angle basis of 30 °, (remnants deform angle 30 ° is comprised when the windup-degree of torsion-bar spring is 108 °, namely actual windup-degree is 78 °) time, torque value corresponding is with it about 75Nm, now still cannot meet the performance requirement of folding and expanding series products, therefore, when second time heats pretwist, by torsion bar spring tension angle to 90 °-100 °, and be slowly warming up to 110-120 DEG C, keep 2 hours, with stove cooling, unloading.
When reversing from torsion-bar spring third time, corresponding curve can draw, namely the third time of step (3) heats pretwist, owing to creating the remnants deform angle of 35 ° after second time torsion, need to reverse on the remnants deform angle basis of 35 ° so third time is reversed, (remnants deform angle 35 ° is comprised when the windup-degree of torsion-bar spring is 113 °, namely actual windup-degree is 78 °) time, torque value corresponding is with it about 80Nm, but for ensureing the stability of torsion-bar spring, still pretwist of again heating is needed, when third time heats pretwist, by torsion bar spring tension angle to 90 °-100 °, and be slowly warming up to 110-120 DEG C, keep 2 hours, with stove cooling, unloading.
After experiencing above-mentioned three pretwists of heating, enter heat aging treatment process, torsion-bar spring is put into heat aging stove, be slowly warming up to 180 DEG C ~ 200 DEG C, keep 2 hours, cool with stove.Fully can discharge unstable residual stress, can ensure that again materials behavior is constant, improve stability and the moment of torsion of torsion-bar spring further.
With reference to the 4th torsion curve, the windup-degree that corresponding is in torsion-bar spring practical work process and torque value, (remnants deform angle 36 ° is comprised when the windup-degree of torsion-bar spring is 114 °, namely actual windup-degree is 78 °) time, torque value corresponding is with it 80Nm, the folded state that folding and expanding series products is in 78 ° of torsional angles for a long time can be met, after each use, the difference of remnants deform angle at about 1 °, and need to provide torque value be more than 80Nm folding-launch the performance requirement of potential energy.
Can draw from the curve relation figure of the windup-degree Fig. 3 and torque value, along with the increase of torsion bar spring tension number of times, residual deformation angle also increases thereupon gradually, but after experiencing pretwist of heating of first three time, the variable quantity of remnants deform angle at about 1 °, and when the actual windup-degree of torsion-bar spring is 78 °, corresponding torque value increases gradually, so when torsion-bar spring occur the 5th time to the N time time, torque value remains on more than 80Nm, can meet the performance requirement of folding and expanding series products.
By heating to 110-120 DEG C to torsion-bar spring, keeping 2 hours, the molecule activity of torsion-bar spring inside can be increased, be conducive to crystal grain and rearrange; By torsion bar spring tension angle to 90 °-100 °, torsion-bar spring internal grain can be made to arrange along torsion bar spring tension direction, add the compactness of torsion-bar spring surface molecular, improve intermolecular force, the top layer of sclerosis torsion-bar spring, the state making torsion-bar spring crystal grain and lattice when windup-degree is greater than use angle is stable, thus reaches the object reducing remnants deform angle, improve torque value; Heat aging process can remove the inner unstable residual stress of torsion-bar spring after pretwist of heating, thus improves stability and the moment of torsion of torsion-bar spring.
The ultimate torsional angle degree of consideration torsion-bar spring is 105 °, and the practical application angle of torsion-bar spring is 78 °, therefore by torsion bar spring tension angle to 90 °-100 °, ensure do not rupture in torsion-bar spring pretwist process and be greater than actual use angle, torsion-bar spring internal grain can be made to arrange along torsion bar spring tension direction;
Heat to 110-120 DEG C to torsion-bar spring, keep 2 hours, when can ensure that materials behavior is constant, strengthen molecule activity, improve stabilization efficiency, and reserve the space of raising temperature for subsequent thermal ageing treatment process;
The temperature of heat aging treatment process is controlled at 180-200 DEG C, keeps 2 hours, fully can discharge unstable residual stress, can ensure that again materials behavior is constant.
As preferably, when first time heats pretwist, by torsion bar spring tension angle to 90 ° ± 1 °, and be slowly warming up to 110 DEG C, torsion-bar spring internal grain can be made to greatest extent to arrange along torsion bar spring tension direction.
As preferably, when second time heats pretwist, by torsion bar spring tension angle to 90 ° ± 1 °, and be slowly warming up to 110 DEG C, torsion-bar spring internal grain can be made equally to greatest extent to arrange along torsion bar spring tension direction.
As preferably, when third time heats pretwist, by torsion bar spring tension angle to 90 ° ± 1 °, and be slowly warming up to 110 DEG C, torsion-bar spring internal grain can be made equally to greatest extent to arrange along torsion bar spring tension direction.
As preferably, in heat aging treatment process, heat aging stove is put in torsion-bar spring zero load, be slowly warming up to 180 DEG C, fully can discharge unstable residual stress to greatest extent, can ensure that again materials behavior is constant.
As preferably, after cutting on line operation, also comprise product inspection operation and warehouse-in operation successively, because the physical dimension of torsion-bar spring, presentation quality, surface roughness and the stability tool of place to torsion-bar spring deposited have a certain impact; Therefore, the stability of torsion-bar spring can be improved further by product inspection operation and warehouse-in operation.
The exemplary illustration of above embodiment just to this patent, does not limit its protection domain, and those skilled in the art can also change, as long as no the Spirit Essence exceeding this patent, in the protection domain of this patent its local.
Claims (6)
1. one kind can be improved the manufacturing process of torsion-bar spring stability, comprise following operation successively: blanking procedure, rough turn operation, heat treatment step, precision grinding process, Linear cut operation, it is characterized in that, between described precision grinding process and described Linear cut operation, carry out heat pretwist operation, heat aging treatment process;
(1) first time heats pretwist operation: load pretwist, by torsion bar spring tension angle to 90 °-100 °, and is slowly warming up to 110-120 DEG C, keeps 2 hours; With stove cooling, unloading;
(2) second time is heated pretwist operation: again load pretwist, by described torsion bar spring tension angle to 90 °-100 °, and is slowly warming up to 110-120 DEG C, keeps 2 hours; With stove cooling, unloading;
(3) third time heats pretwist operation: again load pretwist, by described torsion bar spring tension angle to 90 °-100 °, and is slowly warming up to 110-120 DEG C, keeps 2 hours; With stove cooling, unloading;
(4) heat aging treatment process: described torsion-bar spring is put into heat aging stove, is slowly warming up to 180 ~ 200 DEG C, keeps 2 hours, cools with stove.
2. a kind of manufacturing process that can improve torsion-bar spring stability according to claim 1, is characterized in that, by torsion bar spring tension angle to 90 ° ± 1 ° in described step (1), and is slowly warming up to 110 DEG C.
3. a kind of manufacturing process that can improve torsion-bar spring stability according to claim 2, is characterized in that, by torsion bar spring tension angle to 90 ° ± 1 ° in described step (2), and is slowly warming up to 110 DEG C.
4. a kind of manufacturing process that can improve torsion-bar spring stability according to claim 3, is characterized in that, by torsion bar spring tension angle to 90 ° ± 1 ° in described step (3), and is slowly warming up to 110 DEG C.
5. a kind of manufacturing process that can improve torsion-bar spring stability according to claim 4, is characterized in that, in described step (4), heat aging stove is put in described torsion-bar spring zero load, is slowly warming up to 180 DEG C.
6. a kind of manufacturing process that can improve torsion-bar spring stability according to claim 5, is characterized in that, also comprises product inspection operation and warehouse-in operation after described Linear cut operation successively.
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| CN110227776B (en) * | 2019-07-01 | 2020-10-23 | 昌河飞机工业（集团）有限责任公司 | Rectangular spiral initial tension spring processing method |
| CN114248064A (en) * | 2020-09-21 | 2022-03-29 | 航天科工哈尔滨风华有限公司 | Manufacturing method of high-stability strong torsion bar spring |
| CN114248064B (en) * | 2020-09-21 | 2023-09-05 | 航天科工哈尔滨风华有限公司 | Manufacturing method of high-stability strong torsion bar spring |
| CN112589391A (en) * | 2020-12-08 | 2021-04-02 | 北京星航机电装备有限公司 | Method for manufacturing slender torsion bar spring |
| CN114046919A (en) * | 2021-11-08 | 2022-02-15 | 内蒙古第一机械集团股份有限公司 | Method for measuring relation between torsion angle and torque of rectangular-section torsion spring |
| CN114046919B (en) * | 2021-11-08 | 2024-04-16 | 内蒙古第一机械集团股份有限公司 | Method for measuring torsion angle and torque relation of rectangular-section torsion spring |
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