An elongated roller processing technique

Abstract

The application provides an elongated roller processing technology, which solves the problem of poor processing precision of the existing roller.The steps are as follows: blanking-forging-first heat treatment-rough machining-second heat treatment-first semi-finishing machining-third heat treatment-second semi-finishing machining-rough groove milling-fourth heat treatment-finishing machining-fifth heat treatment-rough grinding-fine groove milling-first groove polishing-surface treatment-correction-second groove polishing-fine grinding-inspection and warehousing.The roller material of the application is alloy steel, and then the strength of the roller is increased and the wear resistance is enhanced after forging and first heat treatment;in the processing process, the stress generated by the roller is eliminated through multiple tempering, so that the roller is not easy to deform in the processing process, and the processing precision of the roller is improved;the process not only improves the processing precision of the roller, but also makes the strength and wear resistance of the roller high, and improves the reliability and service life of the roller.

Description

Technical Field

[0001] This invention relates to the field of roller processing technology, specifically to a process for processing slender rollers. Background Technology

[0002] The take-up roller is one of the key components of a wool combing machine. Its function is to separate the combed wool fiber web through the reciprocating oscillation of the cradle and its own clockwise / counterclockwise rotation, and then convey it out through the reciprocating motion of the sheet. The quality of the roller affects the uniformity of the output yarn. The roller includes the shaft section and the grooved section (such as...). Figure 1 As shown in the figure, most of the rollers used in the market are made of stainless steel or stainless iron. The rollers are prone to deformation during the processing, resulting in poor processing accuracy, which seriously affects the production accuracy and yarn quality. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a process for processing slender rollers, which solves the problem of poor processing accuracy of existing rollers.

[0004] The technical solution adopted in this invention is as follows:

[0005] A process for processing elongated rollers includes the following steps:

[0006] (1) Blanking: The billet is 30Cr2Ni2Mo;

[0007] (2) Forging: The billet is forged using a free forging method;

[0008] (3) First heat treatment: First, normalizing is performed at a temperature of 880-950°C for 0.5-1.5 hours and then air-cooled; then tempering is performed at a temperature of 650-750°C for 1-3 hours and then air-cooled; then quenching is performed at a temperature of 850-950°C for 0.5-1.5 hours and then oil-cooled; finally, tempering is performed at a temperature of 600-650°C for 1-3 hours and then oil-cooled.

[0009] (4) Rough machining: Leave a 4-6mm allowance for each dimension of the billet;

[0010] (5) Second heat treatment: tempering is adopted, the temperature is controlled at 560-600°C, the holding time is 3-5 h, and furnace cooling is performed;

[0011] (6) First semi-finishing: Drill center holes at both ends of the blank, and leave a 1.5-2.5mm allowance for each dimension;

[0012] (7) Third heat treatment: tempering is adopted, the temperature is controlled at 560-600°C, the holding time is 3-5 h, and furnace cooling is performed;

[0013] (8) Second semi-finishing: Correct the center holes at both ends, and allow 0.5-1.5mm allowance for each dimension;

[0014] (9) Rough milling of grooves: Mill grooves on the blank, leaving a depth of 0.8-1mm, and the rollers will be initially formed;

[0015] (10) Fourth heat treatment: tempering is adopted, the temperature is controlled at 400-500°C, the holding time is 3-5 h, and furnace cooling is performed;

[0016] (11) Finishing: Allow 0.2-0.3mm margin for each dimension;

[0017] (12) Fifth heat treatment: tempering is adopted, the temperature is controlled at 200-300°C, the holding time is 3-5 h, and furnace cooling is performed;

[0018] (13) Rough grinding: Leave a margin of 0.1-0.2mm at the end of the roller's optical axis;

[0019] (14) Finish milling the groove;

[0020] (15) First polishing of the groove;

[0021] (16) Surface treatment: Nitriding treatment is adopted, and the temperature is controlled at 520-540°C;

[0022] (17) Correction: The straightness requirement for the roller is 0.08-0.12;

[0023] (18) Second polishing of the groove;

[0024] (19) Fine grinding;

[0025] (20) Inspection and warehousing.

[0026] In step (1), the first heat treatment is performed at a normalizing temperature of 920°C and a holding time of 1 hour; a tempering temperature of 710°C and a holding time of 2 hours; a quenching temperature of 900°C and a holding time of 1 hour; and a tempering temperature of 620°C and a holding time of 2 hours.

[0027] The tempering temperature for the fourth heat treatment in step (10) is 450°C, and the holding time is 4h.

[0028] The tempering temperature for the fifth heat treatment in step (12) is 250°C, and the holding time is 4 hours.

[0029] The beneficial effects of this invention are:

[0030] The roller material of this invention is made of alloy steel, which is then forged and subjected to a first heat treatment to increase the strength and wear resistance of the roller. During the processing, it undergoes multiple tempering processes to eliminate the stress generated in the roller, making the roller less prone to deformation during processing and improving the processing accuracy of the roller. This process not only improves the processing accuracy of the roller but also makes the roller strong, wear-resistant, reliable, and has a longer service life. Attached Figure Description

[0031] Figure 1 This is a diagram of Laura.

[0032] Figure 2 This is a process flow diagram of the present invention. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0034] In the embodiments, such as Figure 2 As shown, a process for processing slender rollers includes the following steps:

[0035] (1) Blanking: The billet is 30Cr2Ni2Mo;

[0036] (2) Forging: The billet is forged using a free forging method;

[0037] (3) First heat treatment: First, normalizing is performed at a temperature of 880-950°C for 0.5-1.5 hours and then air-cooled; then tempering is performed at a temperature of 650-750°C for 1-3 hours and then air-cooled; then quenching is performed at a temperature of 850-950°C for 0.5-1.5 hours and then oil-cooled; finally, tempering is performed at a temperature of 600-650°C for 1-3 hours and then oil-cooled.

[0038] (4) Rough machining: Leave a 5mm allowance for each dimension of the blank;

[0039] (5) Second heat treatment: tempering is adopted, the temperature is controlled at 560-600°C, the holding time is 3-5 h, and furnace cooling is performed;

[0040] (6) First semi-finishing: Drill center holes at both ends of the blank, and leave a 2mm allowance for each dimension;

[0041] (7) Third heat treatment: tempering is adopted, the temperature is controlled at 560-600°C, the holding time is 3-5 h, and furnace cooling is performed;

[0042] (8) Second semi-finishing: Correct the center holes at both ends, and allow 1mm margin for each dimension;

[0043] (9) Rough milling of grooves: Mill grooves on the blank, leaving a depth of 0.8-1mm, and the rollers will be initially formed;

[0044] (10) Fourth heat treatment: tempering is adopted, the temperature is controlled at 400-500°C, the holding time is 3-5 h, and furnace cooling is performed;

[0045] (11) Finishing: Allow 0.2-0.3mm margin for each dimension;

[0046] (12) Fifth heat treatment: tempering is adopted, the temperature is controlled at 200-300°C, the holding time is 3-5 h, and furnace cooling is performed;

[0047] (13) Rough grinding: Leave a 0.15mm allowance at the end of the roller's optical axis;

[0048] (14) Finish milling the groove;

[0049] (15) First polishing of the groove;

[0050] (16) Surface treatment: Nitriding treatment is adopted, and the temperature is controlled at 520-540°C;

[0051] (17) Correction: The straightness requirement for the roller is 0.1;

[0052] (18) Second polishing of the groove;

[0053] (19) Fine grinding;

[0054] (20) Inspection and warehousing.

[0055] The roller material of this invention is made of alloy steel, which is then forged and subjected to a first heat treatment to increase the strength and wear resistance of the roller. During the processing, it undergoes multiple tempering processes to eliminate the stress generated in the roller, making the roller less prone to deformation during processing and improving the processing accuracy of the roller. This process not only improves the processing accuracy of the roller but also makes the roller strong, wear-resistant, reliable, and has a longer service life.

[0056] In the embodiment, the normalizing temperature of the first heat treatment in step (1) is 920°C and the holding time is 1h; the tempering temperature is 710°C and the holding time is 2h; the quenching temperature is 900°C and the holding time is 1h; the tempering temperature is 620°C and the holding time is 2h.

[0057] In the embodiment, the tempering temperature of the fourth heat treatment in step (10) is 450°C and the holding time is 4h.

[0058] In the embodiment, the tempering temperature of the fifth heat treatment in step (12) is 250°C and the holding time is 4h.

[0059] Obviously, the above embodiments of the present invention are merely illustrative examples and not intended to limit the implementation of the invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. However, these obvious variations or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. An elongated roll processing process characterized by: The method comprises the following steps: (1) blanking: the blank is selected from 30Cr2Ni2Mo; (2) forging: the blank is forged by free forging; (3) first heat treatment: normalizing treatment is firstly performed, the normalizing temperature is 920 °C, the holding time is 1 h, and air cooling is adopted; then tempering treatment is performed, the tempering temperature is 710 °C, the holding time is 2 h, and air cooling is adopted; then quenching treatment is performed, the quenching temperature is 900 °C, the holding time is 1 h, and oil cooling is adopted; finally, tempering treatment is performed, the tempering temperature is 620 °C, the holding time is 2 h, and oil cooling is adopted; (4) rough machining: the blank is left with a 4-6 mm allowance on each block size; (5) second heat treatment: tempering treatment is adopted, the temperature is controlled to be 560-600 °C, the holding time is 3-5 h, and furnace cooling is adopted; (6) first semi-finishing machining: the blank is punched with a center hole at two ends, and is left with a 1.5-2.5 mm allowance on each block size; (7) third heat treatment: tempering treatment is adopted, the temperature is controlled to be 560-600 °C, the holding time is 3-5 h, and furnace cooling is adopted; (8) second semi-finishing machining: the center holes at two ends are corrected, and the blank is left with a 0.5-1.5 mm allowance on each block size; (9) rough groove milling: the blank is milled with grooves, the groove depth is left with a 0.8-1 mm allowance, and a roller is initially formed; (10) fourth heat treatment: tempering treatment is adopted, the temperature is controlled to be 400-500 °C, the holding time is 3-5 h, and furnace cooling is adopted; (11) finishing machining: each block size is left with a 0.2-0.3 mm allowance; (12) fifth heat treatment: tempering treatment is adopted, the temperature is controlled to be 200-300 °C, the holding time is 3-5 h, and furnace cooling is adopted; (13) rough grinding: the light axis end of the roller is left with a 0.1-0.2 mm allowance; (14) fine groove milling; (15) first groove polishing; (16) surface treatment: nitrogenization treatment is adopted, the temperature is controlled to be 520-540 °C; (17) correction: the straightness of the roller is required to be 0.08-0.12; (18) second groove polishing; (19) fine grinding; (20) inspection and storage.

2. An elongated roll processing process as claimed in claim 1, characterized in that: The tempering temperature of the step (10) fourth heat treatment is 450 °C, and the holding time is 4 h.

3. An elongated roll processing process as claimed in claim 1, characterized in that: The tempering temperature of the step (12) fifth heat treatment is 250 °C, and the holding time is 4 h.

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