CN102140568A - High-speed steel heat treatment process applied in manufacturing field of moulds - Google Patents
High-speed steel heat treatment process applied in manufacturing field of moulds Download PDFInfo
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- CN102140568A CN102140568A CN 201110058260 CN201110058260A CN102140568A CN 102140568 A CN102140568 A CN 102140568A CN 201110058260 CN201110058260 CN 201110058260 CN 201110058260 A CN201110058260 A CN 201110058260A CN 102140568 A CN102140568 A CN 102140568A
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Abstract
The invention discloses a high-speed heat treatment process applied in manufacturing field of moulds. One time of quenching at 1250 DEG C-1280 DEG C and three or four times of tempering heat treatment at 550 DEG C-570 DEG C in the prior art is changed into a process comprising one time of quenching at 1180 DEG C-1230 DEG C and two times of tempering heat treatment at 300 DEG C-400 DEG C, so that the process can ensure that high-speed steel obtains higher hardness and lower surface roughness; the heat treatment time of the process in the invention is 60% of the original heat treatment time, the quenching and tempering temperatures are reduced, the energy consumption is reduced, and a better economic processing precision is achieved. Besides, the high-speed steel treated in the process can be applied to mould products, and the service life and the strength of the high-speed steel are both obviously longer and higher than those of prior engineering steel profiles.
Description
Technical field
The present invention relates to rapid steel complete processing field, particularly relate to a kind of rapid steel thermal treatment process that is applied to mould manufacturing field.
Background technology
1, the application of rapid steel
The carbide that contains a large amount of high rigidity in the rapid steel tissue has high strength, high rigidity and high-wearing feature, the advantage that good wear resistance and surface accuracy are high.
2, the theoretical process program a kind of commonly used of rapid steel
In theory, rapid steel adopts following operational path usually:
Forge material → pre-treatment → roughing → semi-finishing → thermal treatment (550 ℃～570 ℃ of the 1250 ℃～1280 ℃+tempering of quenching, three to four times) → precision work → finished product
Adopt rapid steel thermal treatment, generally will pass through primary quenching and three to four tempering, 1250 ℃～1280 ℃ of quenching temperatures, 550 ℃～570 ℃ of tempering temperatures just can reach processing requirement.According to above-mentioned operational path, the shared time of thermal treatment accounts for more than 60% of whole process-cycle.
This shows, the heat-treatment protocol complexity of the theoretical technology of rapid steel, big, the consuming time length of energy consumption, production efficiency are low, rapid steel production prices costliness, in for a long time, its range of application only limits to the cutter production, the use field is wide in range inadequately, has restricted the rapid steel application and has developed to other field.
Summary of the invention
Technical problem to be solved by this invention is at big, the consuming time length of prior art rapid steel thermal treatment process energy consumption, production efficiency low, thereby a kind of rapid steel thermal treatment process that is applied to mould applications that has restricted the problem of rapid steel Application Areas and proposed, the existing thermal treatment process of this thermal treatment process, can make rapid steel hardness higher, surfaceness is lower, heat treatment time reduces greatly, and energy consumption also reduces greatly.And the rapid steel of handling through this programme is mainly used in mould manufacturing field.
Technical problem to be solved by this invention can realize by following technique means:
A kind of rapid steel thermal treatment process that is applied to mould manufacturing field, the step of described rapid steel thermal treatment process is:
A) will place 1180 ℃～1230 ℃ temperature to quench through the forging material of mechanical treatment;
B) will place 300 ℃～400 ℃ temperature to do double tempering through the forging material of quench treatment handles.
The described time of carrying out quench treatment is 1 hour 30 minutes～1 hour 45 minutes.
The described time of carrying out double tempering was followed successively by 2 hours～2 hours 15 minutes and 1 hour～1 hour 15 minutes.
Owing to adopted technique scheme, processing method of the present invention has following advantage:
1, processing parameter is optimized in novel process thermal treatment: after 1180 ℃～1230 ℃ of primary quenching temperature, carry out 300 ℃～400 ℃ of double tempering temperature again.It is the highest to obtain hardness, and surfaceness is minimum.
2, the novel process heat treatment time is original 60%, and quenching and tempering temperature reduce, and has reduced power consumption.Reach the optimal economic working accuracy.
Description of drawings
Fig. 1 is the hardness value graphic representation of rapid steel behind different quenching and double tempering.
Fig. 2 is that rapid steel is through different quenching and double tempering rear surface roughness value graphic representation.
Fig. 3 respectively organizes the hardness value graphic representation for rapid steel after each quenching temperature and three 570 ℃ of tempering.
Fig. 4 respectively organizes the surface roughness value graphic representation for rapid steel after each quenching temperature and three 570 ℃ of tempering.
Fig. 5 is rapid steel double tempering and three temper number value graphic representations.
Fig. 6 is rapid steel double tempering and three tempering rear surface roughness value graphic representations.
Among Fig. 1, Fig. 2,
Among Fig. 5, Fig. 6,
Embodiment
For technique means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
(1) thermal treatment prioritization scheme
Metallographic structure is directly relevant with surface hardness and roughness.When material structure changes, the also corresponding change of hardness and roughness.On the engineering, adopt, study the relation of thermal treatment temp and surface hardness and surfaceness intuitively by sample hardness and roughness after the measurement thermal treatment.
Thermal treatment is with SX2-10-13 type high temperature box type resistance furnace, 0 ℃～1600 ℃ of temperature ranges, temperature-controlled precision ± 3 ℃.
Quenching temperature is set at respectively: 1100 ℃, 1150 ℃, 1200 ℃, 1250 ℃, 1300 ℃, and temper again.Tempering temperature is set at respectively: 200 ℃, 350 ℃, 450 ℃, 570 ℃.
1, surface measurements hardness
Every group of 3 samples, each sample is being got 5 point measurements arbitrarily on the mill back plane.Survey 3 groups, totally 15 data points, and calculating mean value.
2, measure roughness concentration
Adopt each data point on the micro-instrument measurement of the JB-6C roughness sample piece.
When measuring roughness, at the direct survey measurements of measured surface, get a roughness value Ry by contact pilotage.Each sample is got 5 data points, totally 3 samples.R
YavgBe the mean value of 15 Ry.
Table 1 influences surface of high speed steel hardness and surfaceness for different quenching.
The graph of relation that data obtain thermal treatment temp and hardness, roughness in the table 1 as shown in Figure 1 and Figure 2.
As can be seen from Figure 1, when quenching temperature reaches 1180 ℃～1230 ℃, and through behind the double tempering, it is maximum that the surface hardness measured value of rapid steel all reaches.
As can be seen from Figure 2, when quenching temperature reaches 1180 ℃～1230 ℃, and through behind the double tempering, it is minimum that the surfaceness measured value of rapid steel all reaches.
Preferred 1200 ℃ of this process program quenching temperature, when quenching temperature is 1200 ℃, and through behind the double tempering, the best results that obtains.
(2) with theoretical technology comparison research
1, the theoretical technology of rapid steel
In theory, the thermal treatment process of rapid steel is to carry out 550 ℃～570 ℃ temper after 1250 ℃～1280 ℃ quenchings again three to four times, in the hope of eliminating residual austenite, obtains stable martensitic stucture, the internal stress that produces when reduction and elimination thermal treatment.Surface measurements hardness and roughness under this state obtain high hardness, and wear resistance and red hardness satisfy requirement of engineering.
2, quenching once reaches three Study of Heat Treatment tests of tempering
Table 2 is surface hardness and the roughness measured value that theoretical technology obtained.
The data of table 2 are concluded, obtained as Fig. 3, Fig. 4 graphic representation: 1 and 2 group and 4 and 5 groups is carried out cylindricizing.
By the table and accompanying drawing in as can be seen, the roughness value of Ry: quenching temperature is in the time of 1100 ℃～1200 ℃, and the surfaceness that each tempering temperature records and quenching temperature are similar substantially by the surface roughness value that each tempering temperature obtained in the time of 1250 ℃～1300 ℃.The surfaceness of this explanation during for 1100 ℃, 1200 ℃ of the quenching temperatures of rapid steel and 1300 ℃ differs not obvious, and according to mechanical workout economic accuracy principle, best heating quenching temperature is at 1200 ℃.
3, only three Study of Heat Treatment tests of tempering secondary and tempering
Fig. 5, Fig. 6 are only tempering secondary and the hardness of three two kinds of thermal treatment process of tempering, the measured value comparative graph of roughness.
The measured data graphic representation of Fig. 5, Fig. 6 shows that surface hardness that three tempering and double tempering are handled and surface roughness value change not obvious.
(3) heat treatment time relatively
The used heat treatment time of novel process parameter is 60% of a theoretical technology.Machining is identical with the used time of cooling, and main difference is at heat treatment time.Specific as follows:
The 1st group of novel process scheme be time spent 4.5h altogether, and the 2nd group of theoretical process program be time spent 7.5h altogether.
Obviously, the 1st group of used time of novel process scheme of adopting only accounts for 60% of the 2nd group of traditional technology scheme heat treatment time, the reduction energy consumption of producing apparatus.
More than be the optimal heat treatment time, our experiments show that floated heat-up time in+15 minutes, resultant product process parameter measurement value is similar substantially, and the time that prolongs smaller or equal to 15 minutes on the basis of above-mentioned time in the operation of historical facts or anecdotes border all is fine.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification sheets just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (3)
1. rapid steel thermal treatment process that is applied to mould manufacturing field is characterized in that the step of described rapid steel thermal treatment process is:
A) will place 1180 ℃～1230 ℃ temperature to quench through the forging material of mechanical treatment;
B) will place 300 ℃～400 ℃ temperature to do double tempering through the forging material of quench treatment handles.
2. a kind of rapid steel thermal treatment process that is applied to mould manufacturing field as claimed in claim 1 is characterized in that, the described time of carrying out quench treatment is 1 hour 30 minutes～1 hour 45 minutes.
3. a kind of rapid steel thermal treatment process that is applied to mould manufacturing field as claimed in claim 1 or 2 is characterized in that, the described time of carrying out double tempering was followed successively by 2 hours～2 hours 15 minutes and 1 hour～1 hour 15 minutes.
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| CN 201110058260 CN102140568A (en) | 2011-03-11 | 2011-03-11 | High-speed steel heat treatment process applied in manufacturing field of moulds |
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| CN 201110058260 CN102140568A (en) | 2011-03-11 | 2011-03-11 | High-speed steel heat treatment process applied in manufacturing field of moulds |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5855696A (en) * | 1995-03-27 | 1999-01-05 | Nippon Steel Corporation | Ultra low carbon, cold rolled steel sheet and galvanized steel sheet having improved fatigue properties and processes for producing the same |
| CN1851026A (en) * | 2006-05-19 | 2006-10-25 | 江苏共昌轧辊有限公司 | High-chromium cast steel milling ball, and its preparing method |
| CN101314809A (en) * | 2008-07-17 | 2008-12-03 | 上海交通大学 | Cast iron series mould material thermal treatment method capable of acquiring controllable and uniform rigidity |
-
2011
- 2011-03-11 CN CN 201110058260 patent/CN102140568A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5855696A (en) * | 1995-03-27 | 1999-01-05 | Nippon Steel Corporation | Ultra low carbon, cold rolled steel sheet and galvanized steel sheet having improved fatigue properties and processes for producing the same |
| CN1851026A (en) * | 2006-05-19 | 2006-10-25 | 江苏共昌轧辊有限公司 | High-chromium cast steel milling ball, and its preparing method |
| CN101314809A (en) * | 2008-07-17 | 2008-12-03 | 上海交通大学 | Cast iron series mould material thermal treatment method capable of acquiring controllable and uniform rigidity |
Non-Patent Citations (1)
| Title |
|---|
| 《中国钼业》 20060430 段江涛 热处理工艺对高钼高钒高速钢轧辊组织和性能的影响 第32-35页 1-3 第30卷, 第2期 2 * |
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Application publication date: 20110803 |