Quin steel wire forming process

Abstract

The invention relates to a piano steel wire forming process which comprises the following steps: 1) primary preforming drawing: a primary preforming cavity used in the primary preforming drawing is 30%-35% larger than the specification of a finished steel wire; (2) the steel wire subjected to primary preforming passes through an annealing furnace to be subjected to low-temperature annealing; 3) performing drawing, soaking and wrapping; (4) secondary preforming drawing is carried out, and a secondary preforming cavity used for secondary preforming drawing is 4%-8% larger than the specification of the finished steel wire; (5) the steel wire subjected to secondary preforming passes through the annealing furnace again to be subjected to secondary low-temperature annealing; (6) the primary steel wire subjected to secondary low-temperature annealing is heated and then subjected to drawing forming; (7) the drawn and formed steel wire enters a heating furnace to be continuously heated for not less than 2 h; and 8) performing final annealing to obtain the high-quality piano wire.

Description

Technical Field

[0001] The invention relates to a steel wire preparation technology, in particular to the preparation of special steel wire, specifically, to a piano steel wire forming process. Background Art

[0002] Because piano wire has good winding ability, high surface lubricity, excellent winding and elongation, high tensile strength and excellent formability, stable quality, it is widely used in various types of pressure, tension and torsion springs at home and abroad. It is suitable for winding various types of springs.

[0003] Since piano wire has great application prospects, the development of high-quality piano wire forming technology will greatly promote the widespread application of piano wire.

[0004] Therefore, it is necessary to provide a piano wire forming process to achieve the above-mentioned purpose. Summary of the invention

[0005] The purpose of the invention is to provide a piano wire forming process.

[0006] The present invention achieves the above object through the following technical solutions:

[0007] A piano wire forming process, comprising the following steps:

[0008] 1) One-time preforming drawing: the one-time preforming forming cavity used in the one-time preforming drawing is 30%-35% larger than the finished steel wire specification;

[0009] 2) The preformed steel wire passes through an annealing furnace for low-temperature annealing;

[0010] 3) Carry out infiltration and wrapping of the drawn part;

[0011] 4) Perform secondary preforming drawing, wherein the secondary preforming forming cavity used in the secondary preforming drawing is 4%-8% larger than the finished steel wire specification;

[0012] 5) The steel wire after secondary preforming passes through the annealing furnace again for secondary low-temperature annealing;

[0013] 6) The primary steel wire after secondary low temperature annealing is heated and then drawn;

[0014] 7) The drawn steel wire enters the heating furnace for heating for not less than 2 hours;

[0015] 8) Perform final annealing to obtain high-quality piano wire.

[0016] Furthermore, the preforming is done by drawing at a mold temperature of 450°-470°.

[0017] Furthermore, secondary preforming drawing is performed with a mold temperature of 480°-490°.

[0018] Furthermore, the annealing after the primary preforming is performed at a temperature of 810°-830° and a time of not less than 25 minutes.

[0019] Furthermore, the annealing after the secondary preforming is performed at a temperature of 820°-825° and a time of not less than 35 minutes.

[0020] Further, the primary steel wire after secondary low temperature annealing is heated at a temperature of 850° for a time not exceeding 15 minutes.

[0021] Furthermore, the final annealing temperature is 420-440° and the time is 35-40 min.

[0022] Compared with the prior art, the invention can manufacture piano wire quickly and with high quality, and is convenient for the wide promotion and application of piano wire. DETAILED DESCRIPTION

[0023] Embodiment 1:

[0024] This embodiment shows a piano wire forming process, the steps comprising:

[0025] 1) One-time preforming drawing, the one-time preforming forming cavity used in the one-time preforming drawing is 30% larger than the finished steel wire specification;

[0026] 2) The preformed steel wire passes through an annealing furnace for low-temperature annealing;

[0027] 3) Carry out infiltration and wrapping of the drawn part;

[0028] 4) Perform secondary preforming drawing, wherein the secondary preforming forming cavity used in the secondary preforming drawing is 4% larger than the specification of the finished steel wire;

[0029] 5) The steel wire after secondary preforming passes through the annealing furnace again for secondary low-temperature annealing;

[0030] 6) The primary steel wire after secondary low temperature annealing is heated and then drawn;

[0031] 7) The drawn steel wire enters the heating furnace for heating for not less than 2 hours;

[0032] 8) Perform final annealing to obtain high-quality piano wire.

[0033] in:

[0034] One-step preforming drawing, mold temperature 450°.

[0035] Secondary preforming drawing, mold temperature 480°.

[0036] Annealing after primary preforming, the annealing temperature is 810°, and the time is not less than 25 minutes.

[0037] Annealing after secondary preforming, the annealing temperature is 820°, and the time is not less than 35 minutes.

[0038] The primary steel wire after secondary low-temperature annealing is heated at a temperature of 850° for a time not exceeding 15 minutes.

[0039] The final annealing temperature is 420°C and the time is 35 min.

[0040] Embodiment 2:

[0041] This embodiment shows a piano wire forming process, the steps comprising:

[0042] 1) One-time preforming drawing, the one-time preforming forming cavity used in the one-time preforming drawing is 35% larger than the finished steel wire specification;

[0043] 2) The preformed steel wire passes through an annealing furnace for low-temperature annealing;

[0044] 3) Carry out infiltration and wrapping of the drawn part;

[0045] 4) Perform secondary preforming drawing, where the secondary preforming forming cavity used in the secondary preforming drawing is 8% larger than the finished steel wire specification;

[0046] 5) The steel wire after secondary preforming passes through the annealing furnace again for secondary low-temperature annealing;

[0047] 6) The primary steel wire after secondary low temperature annealing is heated and then drawn;

[0048] 7) The drawn steel wire enters the heating furnace for heating for not less than 2 hours;

[0049] 8) Perform final annealing to obtain high-quality piano wire.

[0050] in:

[0051] One-step preforming drawing, mold temperature 470°.

[0052] Secondary preforming drawing, mold temperature 490°.

[0053] Annealing after primary preforming, the annealing temperature is 830°, and the time is not less than 25 minutes.

[0054] Annealing after secondary preforming, the annealing temperature is 825°, and the time is not less than 35 minutes.

[0055] The primary steel wire after secondary low-temperature annealing is heated at a temperature of 850° for a time not exceeding 15 minutes.

[0056] The final annealing temperature was 440° and the time was 40 min.

[0057] Embodiment 3:

[0058] This embodiment shows a piano wire forming process, the steps comprising:

[0059] 1) One-time preforming drawing, the one-time preforming forming cavity used in the one-time preforming drawing is 33% larger than the finished steel wire specification;

[0060] 2) The preformed steel wire passes through an annealing furnace for low-temperature annealing;

[0061] 3) Carry out infiltration and wrapping of the drawn part;

[0062] 4) Perform secondary preforming drawing, where the secondary preforming forming cavity used in the secondary preforming drawing is 6% larger than the finished steel wire specification;

[0063] 5) The steel wire after secondary preforming passes through the annealing furnace again for secondary low-temperature annealing;

[0064] 6) The primary steel wire after secondary low temperature annealing is heated and then drawn;

[0065] 7) The drawn steel wire enters the heating furnace for heating for not less than 2 hours;

[0066] 8) Perform final annealing to obtain high-quality piano wire.

[0067] in:

[0068] One-step preforming drawing, mold temperature 460°.

[0069] Secondary preforming drawing, mold temperature 485°.

[0070] Annealing after primary preforming, the annealing temperature is 820°, and the time is not less than 25 minutes.

[0071] Annealing after secondary preforming, the annealing temperature is 823°, and the time is not less than 35 minutes.

[0072] The primary steel wire after secondary low-temperature annealing is heated at a temperature of 850° for a time not exceeding 15 minutes.

[0073] The final annealing temperature is 430° and the time is 35-40 min.

[0074] Compared with the prior art, the invention can manufacture piano wire quickly and with high quality, and is convenient for the wide promotion and application of piano wire.

[0075] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A piano wire forming process, It is characterized by: step include: 1) One-time preforming drawing: the one-time preforming forming cavity used in the one-time preforming drawing is 30%-35% larger than the finished steel wire specification; 2) The preformed steel wire passes through an annealing furnace for low-temperature annealing; 3) Carry out infiltration and wrapping of the drawn part; 4) Perform secondary preforming drawing, wherein the secondary preforming forming cavity used in the secondary preforming drawing is 4%-8% larger than the finished steel wire specification; 5) The steel wire after secondary preforming passes through the annealing furnace again for secondary low-temperature annealing; 6) The primary steel wire after secondary low temperature annealing is heated and then drawn; 7) The drawn steel wire enters the heating furnace for heating for not less than 2 hours; 8) Perform final annealing to obtain high-quality piano wire.

2. A piano wire forming process according to claim 1, Features: One-step preforming drawing, mold temperature 450°-470°.

3. A piano wire forming process according to claim 2, Features: Secondary preforming drawing, mold temperature 480°-490°.

4. A piano wire forming process according to claim 3, Features: Annealing after primary preforming, the annealing temperature is 810°-830°, and the time is not less than 25 minutes.

5. A piano wire forming process according to claim 4, Features: Annealing after secondary preforming, the annealing temperature is 820°-825°, and the time is not less than 35 minutes.

6. A piano wire forming process according to claim 5, Features: The primary steel wire after secondary low-temperature annealing is heated at a temperature of 850° for a time not exceeding 15 minutes.

7. A piano wire forming process according to claim 6, Features: The final annealing temperature is 420-440° and the time is 35-40 min.