CN113751642B - Forging method of high-toughness marine diesel engine piston rod - Google Patents
Forging method of high-toughness marine diesel engine piston rod Download PDFInfo
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- CN113751642B CN113751642B CN202110978529.0A CN202110978529A CN113751642B CN 113751642 B CN113751642 B CN 113751642B CN 202110978529 A CN202110978529 A CN 202110978529A CN 113751642 B CN113751642 B CN 113751642B
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- piston rod
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- forging
- prefabricated member
- steel ingot
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- 238000005242 forging Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 59
- 239000000835 fiber Substances 0.000 claims abstract description 59
- 239000010959 steel Substances 0.000 claims abstract description 59
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 239000000843 powder Substances 0.000 claims abstract description 18
- 238000005496 tempering Methods 0.000 claims abstract description 13
- 238000010791 quenching Methods 0.000 claims abstract description 10
- 230000000171 quenching effect Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 20
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 6
- 239000004917 carbon fiber Substances 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 229920000271 Kevlar® Polymers 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000004761 kevlar Substances 0.000 claims description 4
- 238000005457 optimization Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/18—Making machine elements pistons or plungers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Forging (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention relates to a forging method of a high-toughness marine diesel engine piston rod, which comprises the following forging steps: forging a steel ingot to obtain an inner prefabricated member with a bulge on the outer wall; wrapping the steel powder outside the fiber body and integrating the steel powder and the fiber body into a whole to obtain a mixed fiber yarn; magnetizing the inner prefabricated member in a strong magnetic field environment, and scattering mixed fiber yarns on the magnetized inner prefabricated member, wherein the mixed fiber yarns are vertically adsorbed on the surface of the magnetized inner prefabricated member; and heating the steel ingot in a forging furnace, placing the magnetized inner prefabricated member with the mixed fiber yarn adsorbed on the surface into a forging die, injecting molten steel ingot melt, and quenching and tempering to obtain the piston rod. The invention is characterized in that the inner prefabricated member with the protrusions is processed, the inner prefabricated member is magnetized, the fiber body wrapped by steel materials is vertically arranged on the surface of the inner prefabricated member, and then the fiber body is placed in a molten steel ingot to be forged together with the steel ingot, so that the fiber body is vertically divergently distributed in the piston rod, and the strength and toughness of the piston rod are greatly improved.
Description
Technical Field
The invention belongs to the technical field of manufacturing of diesel engine piston rods, and particularly relates to a forging method of a high-toughness marine diesel engine piston rod.
Background
The marine diesel engine has the advantages of large power range, high heat efficiency, good economic performance, easy starting, convenient use and maintenance, and the like. And the piston rod in a diesel engine is the main component part thereof. Most of marine diesel engine piston rods in the market at present are forged by steel ingots, and the produced piston rods often have the problem of poor toughness at two ends.
Disclosure of Invention
The invention aims to solve the problems and provide a forging method of a high-toughness marine diesel engine piston rod.
The invention realizes the above purpose through the following technical scheme:
a forging method of a high-toughness marine diesel engine piston rod comprises the following forging steps:
s1, taking a steel ingot, forging and forming in a forging die, and cooling to obtain an inner prefabricated member with a bulge on the outer wall;
s2, taking a steel ingot, grinding into steel powder, wrapping the steel powder outside a fiber body, heating to enable the steel powder to be melted and fused with the fiber body into a whole, and cooling to obtain a mixed fiber yarn;
s3, magnetizing the inner prefabricated member with the protrusions, which is prepared in the step S1, in a strong magnetic field environment to obtain a magnetized inner prefabricated member;
s4, scattering the mixed fiber yarn prepared in the step S2 on the magnetized inner prefabricated member prepared in the step S3, wherein the mixed fiber yarn is vertically adsorbed on the surface of the magnetized inner prefabricated member;
s5, taking a steel ingot and heating in a forging furnace, putting the magnetized inner prefabricated member with the surface adsorbed with the mixed fiber yarn prepared in the step S4 into a forging die, injecting molten steel ingot melt, and hardening and tempering to obtain the piston rod.
As a further optimization of the present invention, the steel ingot materials used in steps S1, S2 and S5 are the same.
As a further optimization scheme of the invention, the steel ingot/steel powder heating steps in the steps S1, S2 and S5 are as follows: heating to 600-700 ℃ within 3 hours, preserving heat for 3-4 hours, continuously heating to 1200-1250 ℃ within 8 hours, preserving heat for 7-8 hours, and the whole heating process can avoid cracking caused by overlarge temperature difference between the inside and the outside of the steel ingot in the heating process, thereby reducing internal stress.
As a further optimized scheme of the invention, the inner prefabricated members prepared in the step S1 are in a group, the number of the group is at least one, the shape of the inner prefabricated members is the same as that of the piston rod, and the size of the inner prefabricated members is smaller than that of the piston rod.
As a further optimization scheme of the invention, the two groups of inner prefabricated members prepared in the step S1 are distributed inside the two ends of the piston rod, the number of each group of inner prefabricated members is at least one, the two groups of inner prefabricated members are respectively identical to the shape of the two ends of the piston rod, and the size of each group of inner prefabricated members is smaller than that of the piston rod.
As a further optimization scheme of the invention, the fiber body in the step S2 adopts one or more of carbon fiber, kevlar fiber and ceramic fiber.
As a further optimization scheme of the invention, after the molten steel ingot melt is injected in the step S5, tempering is performed: heating the forging piece in the forging die to 760-800 ℃ at a heating speed of 180-200 ℃/h, preserving heat for 5-6h, then putting the forging piece into quenching liquid for cooling, heating to 560-600 ℃ at a heating speed of 180-200 ℃/h, preserving heat for 12-14h, then air-cooling to room temperature, and performing tempering after quenching to increase the toughness of a piston rod, so that the inner prefabricated member and a post-injected steel ingot are completely combined and melted into a whole, thereby avoiding influencing strength and the like.
The invention has the beneficial effects that:
1) The invention is characterized in that the inner prefabricated member with the protrusions is processed, the inner prefabricated member is magnetized, the fiber body wrapped by steel materials is vertically arranged on the surface of the inner prefabricated member, and then the fiber body is placed in a molten steel ingot to be forged together with the steel ingot, so that the fiber body is vertically staggered in the piston rod to form a net shape, and the strength and toughness of the piston rod are greatly increased.
Drawings
FIG. 1 is a schematic cross-sectional view of a piston rod with an inner preform according to the present invention prior to tempering;
FIG. 2 is a schematic view of the portion A of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic cross-sectional view of a piston rod with two inner preforms according to the invention before tempering;
in the figure: 1. an inner preform; 2. a protrusion; 3. mixing fiber filaments; 4. and (3) steel ingot melt.
Detailed Description
The following detailed description of the present application is provided in conjunction with the accompanying drawings, and it is to be understood that the following detailed description is merely illustrative of the application and is not to be construed as limiting the scope of the application, since numerous insubstantial modifications and adaptations of the application will be to those skilled in the art in light of the foregoing disclosure.
Example 1
A forging method of a high-toughness marine diesel engine piston rod comprises the following forging steps:
s1, taking a steel ingot, forging and forming in a forging die, and cooling to obtain a group of inner prefabricated members 1 with protrusions 2 on the outer wall, wherein the number of the group of inner prefabricated members 1 is at least one, and the shape of the inner prefabricated members 1 is the same as that of a piston rod, and the size of the inner prefabricated members is smaller than that of the piston rod;
s2, taking a steel ingot, grinding into steel powder, wrapping the steel powder outside a fiber body, heating to enable the steel powder to be melted and fused with the fiber body into a whole, and cooling to obtain a mixed fiber yarn 3; the fiber body adopts carbon fiber;
s3, magnetizing the inner prefabricated member 1 with the protrusions 2 prepared in the step S1 in a strong magnetic field environment to obtain a magnetized inner prefabricated member 1;
s4, scattering the mixed fiber yarn 3 prepared in the step S2 on the magnetized inner prefabricated member 1 prepared in the step S3, wherein the mixed fiber yarn 3 is vertically adsorbed on the surface of the magnetized inner prefabricated member 1;
s5, taking a steel ingot and heating in a forging furnace, putting the magnetized inner prefabricated member 1 with the surface adsorbed with the mixed fiber yarn 3 prepared in the step S4 into a forging die, injecting molten steel ingot melt 4, specifically shown in figures 1 and 2, and quenching and tempering to obtain a piston rod; the tempering step is as follows: heating the forging piece in the forging die to 800 ℃ at a heating speed of 180 ℃/h, preserving heat for 6h, then putting the forging piece into quenching liquid for cooling, heating to 600 ℃ at a heating speed of 180 ℃/h, preserving heat for 14h, and then cooling to room temperature.
The steel ingot materials adopted in the steps S1, S2 and S5 are the same, and the heating steps are as follows: heating to 600 ℃ in 3 hours, preserving heat for 4 hours, continuously heating to 1200 ℃ in 8 hours, and preserving heat for 8 hours.
Example 2
A forging method of a high-toughness marine diesel engine piston rod comprises the following forging steps:
s1, taking a steel ingot, forging and forming in a forging die, and cooling to obtain a group of inner prefabricated members 1 with protrusions 2 on the outer wall, wherein the number of the group of inner prefabricated members 1 is at least one, and the shape of the inner prefabricated members 1 is the same as that of a piston rod, and the size of the inner prefabricated members is smaller than that of the piston rod;
s2, taking a steel ingot, grinding into steel powder, wrapping the steel powder outside a fiber body, heating to enable the steel powder to be melted and fused with the fiber body into a whole, and cooling to obtain a mixed fiber yarn 3; the fiber body adopts carbon fiber;
s3, magnetizing the inner prefabricated member 1 with the protrusions 2 prepared in the step S1 in a strong magnetic field environment to obtain a magnetized inner prefabricated member 1;
s4, scattering the mixed fiber yarn 3 prepared in the step S2 on the magnetized inner prefabricated member 1 prepared in the step S3, wherein the mixed fiber yarn 3 is vertically adsorbed on the surface of the magnetized inner prefabricated member 1;
s5, taking a steel ingot and heating in a forging furnace, putting the magnetized inner prefabricated member 1 with the surface adsorbed with the mixed fiber filaments 3 prepared in the step S4 into a forging die, injecting molten steel ingot melt 4, and quenching and tempering to obtain a piston rod; the tempering step is as follows: and heating the forging piece in the forging die to 780 ℃ at a heating speed of 190 ℃/h, preserving heat for 5.5h, then putting the forging piece into quenching liquid for cooling, heating to 580 ℃ at a heating speed of 190 ℃/h, preserving heat for 13h, and then cooling to room temperature.
The steel ingot materials adopted in the steps S1, S2 and S5 are the same, and the heating steps are as follows: heating to 650 ℃ in 3 hours, preserving heat for 3.5 hours, continuously heating to 1230 ℃ in 8 hours, and preserving heat for 7.5 hours.
Example 3
A forging method of a high-toughness marine diesel engine piston rod comprises the following forging steps:
s1, taking a steel ingot, forging and forming in a forging die, and cooling to obtain a group of inner prefabricated members 1 with protrusions 2 on the outer wall, wherein the number of the group of inner prefabricated members 1 is at least one, and the shape of the inner prefabricated members 1 is the same as that of a piston rod, and the size of the inner prefabricated members is smaller than that of the piston rod;
s2, taking a steel ingot, grinding into steel powder, wrapping the steel powder outside a fiber body, heating to enable the steel powder to be melted and fused with the fiber body into a whole, and cooling to obtain a mixed fiber yarn 3; the fiber body adopts carbon fiber;
s3, magnetizing the inner prefabricated member 1 with the protrusions 2 prepared in the step S1 in a strong magnetic field environment to obtain a magnetized inner prefabricated member 1;
s4, scattering the mixed fiber yarn 3 prepared in the step S2 on the magnetized inner prefabricated member 1 prepared in the step S3, wherein the mixed fiber yarn 3 is vertically adsorbed on the surface of the magnetized inner prefabricated member 1;
s5, taking a steel ingot and heating in a forging furnace, putting the magnetized inner prefabricated member 1 with the surface adsorbed with the mixed fiber filaments 3 prepared in the step S4 into a forging die, injecting molten steel ingot melt 4, and quenching and tempering to obtain a piston rod; the tempering step is as follows: heating the forging piece in the forging die to 760 ℃ at a heating speed of 200 ℃/h, preserving heat for 5h, then placing the forging piece in quenching liquid for cooling, heating to 560 ℃ at a heating speed of 200 ℃/h, preserving heat for 12h, and then air-cooling to room temperature.
The steel ingot materials adopted in the steps S1, S2 and S5 are the same, and the heating steps are as follows: heating to 700 ℃ in 3 hours, preserving heat for 3 hours, continuously heating to 1250 ℃ in 8 hours, and preserving heat for 7 hours.
Example 4
The present embodiment is substantially the same as embodiment 2, except that the inner preforms 1 prepared in step S1 are two groups and distributed inside the two ends of the piston rod, the number of the inner preforms 1 in each group is at least one, the shapes of the two groups of inner preforms 1 are the same as the shapes of the two ends of the piston rod, and the sizes of the two groups of inner preforms 1 are smaller than the sizes of the piston rod, and see fig. 3.
Example 5
This example is essentially the same as example 2, except that Kevlar fibers are used for the fiber body.
Example 6
This example is substantially the same as example 2, except that the fibrous body is made of carbon fiber and ceramic fiber in a ratio of 5:1.
Example 7
This example is essentially the same as example 2, except that Kevlar fibers and ceramic fibers are used in a 5:1 ratio.
Comparative example 1
This comparative example provides a forging method for a high-toughness marine diesel piston rod, which is substantially identical to example 2, the only difference being that: step 2 and step 3 are cancelled.
The piston rods prepared in examples 1 to 7 and comparative example 1 were used as test pieces, and the following data were obtained by performing experiments such as tensile resistance and impact resistance:
| tensile strength sigma b/MPa | Impact toughness (20 ℃ C.) KV | Elongation delta/% | |
| Example 1 | 860 | 96 | 18.6 |
| Example 2 | 920 | 120 | 21 |
| Example 3 | 890 | 112 | 20.4 |
| Example 4 | Middle 810, end 920 | Middle portion 56, end portion 120 | Middle portion 16, end portion 21 |
| Example 5 | 890 | 106 | 19 |
| Example 6 | 930 | 115 | 18.5 |
| Example 7 | 930 | 109 | 18.3 |
| Comparative example 1 | 810 | 56 | 16 |
| Standard value | ≥780 | ≥25 | 15 |
From the above table, the piston rod of the present invention adopts the addition of the fiber body during forging, and the obtained mixed fiber filaments 3 are distributed in the piston rod in a staggered manner to form a three-dimensional net shape, so that the toughness of the piston rod can be increased.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (4)
1. The forging method of the high-toughness marine diesel engine piston rod is characterized by comprising the following forging steps of:
s1, taking a steel ingot, forging and forming in a forging die, and cooling to obtain an inner prefabricated member with a bulge on the outer wall;
s2, taking a steel ingot, grinding into steel powder, wrapping the steel powder outside a fiber body, heating to enable the steel powder to be melted and fused with the fiber body into a whole, and cooling to obtain a mixed fiber yarn; wherein the fiber body adopts one or more of carbon fiber, kevlar fiber and ceramic fiber;
s3, magnetizing the inner prefabricated member with the protrusions, which is prepared in the step S1, in a strong magnetic field environment to obtain a magnetized inner prefabricated member;
s4, scattering the mixed fiber yarn prepared in the step S2 on the magnetized inner prefabricated member prepared in the step S3, wherein the mixed fiber yarn is vertically adsorbed on the surface of the magnetized inner prefabricated member;
s5, taking a steel ingot and heating in a forging furnace, putting the magnetized inner prefabricated member with the surface adsorbed with the mixed fiber yarn, which is prepared in the step S4, into a forging die, injecting molten steel ingot melt, and tempering to obtain a piston rod, wherein the molten steel ingot melt is injected and then tempered: heating to 760-800 ℃ at a heating rate of 180-200 ℃/h, preserving heat for 5-6h, cooling in quenching liquid, heating to 560-600 ℃ at a heating rate of 180-200 ℃/h, preserving heat for 12-14h, and cooling to room temperature.
2. The forging method of the high-toughness marine diesel engine piston rod according to claim 1, wherein: the steel ingot materials used in steps S1, S2 and S5 are the same.
3. The forging method of the high-toughness marine diesel engine piston rod according to claim 1, wherein: the inner prefabricated members prepared in the step S1 are a group, the number of the group is at least one, the shape of the inner prefabricated members is the same as that of the piston rod, and the size of the inner prefabricated members is smaller than that of the piston rod.
4. The forging method of the high-toughness marine diesel engine piston rod according to claim 1, wherein: the two groups of inner prefabricated members prepared in the step S1 are distributed inside the two ends of the piston rod, the number of each group of inner prefabricated members is at least one, the two groups of inner prefabricated members are respectively identical to the shape of the two ends of the piston rod, and the size of each group of inner prefabricated members is smaller than that of the piston rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110978529.0A CN113751642B (en) | 2021-08-25 | 2021-08-25 | Forging method of high-toughness marine diesel engine piston rod |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110978529.0A CN113751642B (en) | 2021-08-25 | 2021-08-25 | Forging method of high-toughness marine diesel engine piston rod |
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| Publication Number | Publication Date |
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| CN113751642A CN113751642A (en) | 2021-12-07 |
| CN113751642B true CN113751642B (en) | 2023-12-26 |
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|---|---|---|---|---|
| US5170556A (en) * | 1990-01-26 | 1992-12-15 | Isuzu Motors Limited | Production method for forged component made of composite material |
| JPH10180396A (en) * | 1996-12-24 | 1998-07-07 | Honda Motor Co Ltd | Production of composite reinforced piston |
| CN104175062A (en) * | 2013-05-28 | 2014-12-03 | 陕西华威锻压有限公司 | All-fiber-texture large-size double-flange fan main shaft forging method |
| CN109622874A (en) * | 2019-01-16 | 2019-04-16 | 常州市双强机械制造有限公司 | The manufacturing process of oil cylinder head |
| CN111299481A (en) * | 2019-11-19 | 2020-06-19 | 湖北坚丰科技股份有限公司 | Closed forging and pressing forming process for gear shaft of new energy automobile engine |
| CN111809112A (en) * | 2020-06-19 | 2020-10-23 | 张家港海锅新能源装备股份有限公司 | Production method of S42Cr1S forging for piston rod of marine diesel engine |
| CN111992675A (en) * | 2020-08-11 | 2020-11-27 | 安庆中船柴油机有限公司 | Manufacturing method of marine diesel engine cylinder cover and cylinder cover |
| CN112853055A (en) * | 2020-12-30 | 2021-05-28 | 宝鼎重工有限公司 | Heat treatment process for high-toughness large marine diesel engine piston rod forge piece |
| CN112893510A (en) * | 2021-03-05 | 2021-06-04 | 无锡继平锻造有限公司 | Forging and heat treatment process of marine corrosion-resistant pull rod duplex stainless steel forging |
-
2021
- 2021-08-25 CN CN202110978529.0A patent/CN113751642B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5170556A (en) * | 1990-01-26 | 1992-12-15 | Isuzu Motors Limited | Production method for forged component made of composite material |
| JPH10180396A (en) * | 1996-12-24 | 1998-07-07 | Honda Motor Co Ltd | Production of composite reinforced piston |
| CN104175062A (en) * | 2013-05-28 | 2014-12-03 | 陕西华威锻压有限公司 | All-fiber-texture large-size double-flange fan main shaft forging method |
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| CN111299481A (en) * | 2019-11-19 | 2020-06-19 | 湖北坚丰科技股份有限公司 | Closed forging and pressing forming process for gear shaft of new energy automobile engine |
| CN111809112A (en) * | 2020-06-19 | 2020-10-23 | 张家港海锅新能源装备股份有限公司 | Production method of S42Cr1S forging for piston rod of marine diesel engine |
| CN111992675A (en) * | 2020-08-11 | 2020-11-27 | 安庆中船柴油机有限公司 | Manufacturing method of marine diesel engine cylinder cover and cylinder cover |
| CN112853055A (en) * | 2020-12-30 | 2021-05-28 | 宝鼎重工有限公司 | Heat treatment process for high-toughness large marine diesel engine piston rod forge piece |
| CN112893510A (en) * | 2021-03-05 | 2021-06-04 | 无锡继平锻造有限公司 | Forging and heat treatment process of marine corrosion-resistant pull rod duplex stainless steel forging |
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