CN109014783A - A kind of IC engine link rod manufacturing process - Google Patents
A kind of IC engine link rod manufacturing process Download PDFInfo
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- CN109014783A CN109014783A CN201810929944.5A CN201810929944A CN109014783A CN 109014783 A CN109014783 A CN 109014783A CN 201810929944 A CN201810929944 A CN 201810929944A CN 109014783 A CN109014783 A CN 109014783A
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- connecting rod
- major part
- blank
- manufacturing process
- processing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/02—Constructions of connecting-rods with constant length
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
本发明提出一种内燃机连杆制造工艺，包括以下步骤：铸造毛坯、热处理、铣削处理、粗磨加工、钻孔及扩孔、加工螺栓孔、胀断处理、大头孔与小头孔的精加工和端面精加工；本发明提出通过对铸造成型的连杆毛坯进行热处理可以提高连杆毛坯的刚度、强度、塑性和韧性同时可以改善连杆毛坯内部组织不均匀、不致密和内部化学成分偏差较大的问题，提高连杆毛坯的物理性能，通过在铸造成型前在模具型腔内加入金属粉末形成的断裂界限可以方便后期在胀断处理分离连杆的大头时胀断效果好，不会出现胀断口豁口碎裂问题，提高了胀断处理的效率和成品合格率。
The invention proposes a manufacturing process of an internal combustion engine connecting rod, which includes the following steps: casting blank, heat treatment, milling treatment, rough grinding, drilling and reaming, machining bolt holes, expansion treatment, finishing of big head hole and small head hole and end surface finishing; the present invention proposes that the rigidity, strength, plasticity and toughness of the connecting rod blank can be improved by heat-treating the casting-formed connecting rod blank, and at the same time, the internal structure of the connecting rod blank can be improved. The big problem is to improve the physical properties of the connecting rod blank. The fracture limit formed by adding metal powder into the mold cavity before casting can facilitate the later expansion when the large end of the separating connecting rod is processed. The expansion effect is good and will not appear The cracking problem of the gap at the expansion fracture improves the efficiency of the expansion treatment and the qualified rate of the finished product.
Description
Technical field
The present invention relates to combustion engine manufacture field more particularly to a kind of IC engine link rod manufacturing process.
Background technique
Connecting rod is the main movement component of internal combustion engine, and the effect of connecting rod is that the power for bearing piston is transmitted to crankshaft, and makes to live
The reciprocating motion of plug is changed into the rotary motion of crankshaft, and connecting rod is mainly by gonnecting rod body, big end and small end of connecting rod and connecting rod spiral shell
The composition such as bolt (or screw), connecting rod will not only have high tension, Compressive Strength and high fatigue strength, and have enough rigidity
And toughness.
The intensity that existing IC engine link rod processing technology is easy to appear the connecting rod processed is inadequate, connecting rod easy fracture, existing
Some IC engine link rod processing processing is most of for integration casting, the heat treatment temperature used for different location and cooling temperature
Degree is consistent, but since the intensity requirement of different parts is different, therefore what existing Machining of Connecting Rod technique produced
The some positions of connecting rod can be unfavorable for the post-production of connecting rod, will increase manufacturing process difficulty.Therefore, the present invention proposes a kind of internal combustion
Machine connecting rod manufacturing process, to solve shortcoming in the prior art.
Summary of the invention
In view of the above-mentioned problems, the present invention proposes that carrying out heat treatment by the connecting rod blank to casting and forming can be improved connecting rod
Rigidity, intensity, plasticity and the toughness of blank can improve that connecting rod blank interior tissue is uneven, not fine and close and internal chemical simultaneously
The larger problem of composition tolerances, improves the physical property of connecting rod blank.
1. a kind of IC engine link rod manufacturing process, it is characterised in that: the following steps are included:
Step 1: cast blank
It selects the metallic solution of model 40Cr steel alloy to carry out casting and forming, carries out cooling treatment, the company of being made after casting and forming
Bar blank；
Step 2: heat treatment
Connecting rod blank is heated, connecting rod blank is kept the temperature after heating, then the connecting rod blank after heat preservation is heated,
Heat preservation and cooling treatment, finally carry out heating of rising again for the connecting rod blank after cooling treatment, rise again and heat subsequent continuous isothermal holding,
Quenched/tempered connecting rod blank is made；
Step 3: milling processing
Quenched/tempered connecting rod blank is subjected to milling processing；
Step 4: corase grinding processing
Milling treated quenched/tempered connecting rod blank is subjected to grinding machine coarse grinding treatment, obtains connecting rod；
Step 5: drilling and reaming
The microcephaly of the major part of connecting rod and connecting rod is subjected to drilling processing, obtains big end hole and small head bore, then by big end hole and microcephaly
Hole carries out expanding treatment；
Step 6: processing bolt hole
Carry out bore hole in the big both sides of head drill bolt hole of connecting rod, then by bolt hole, tapping carried out to bolt after bore hole, bolt hole with
The body of rod of connecting rod is parallel to each other, and two bolts hole are symmetrical on the basis of the body of rod of connecting rod；
Step 7: swollen disconnected processing
Connecting rod is put on swollen off line, swollen disconnected processing is carried out to the major part of connecting rod, separated the major part of connecting rod, become the first major part
Separation unit and the second major part separation unit, then the first major part separation unit and the second major part separation unit are bolted；
Step 8: the finishing of big end hole and small head bore
Right boring processing is carried out to small head bore with boring machine tool, right boring is carried out to big end hole as positioning datum using small head bore after processing and is added
Work；
Step 9: end face finishing
The end face of the body of rod of the major part of connecting rod, the microcephaly of connecting rod and connecting rod is subjected to fine grinding, allows the major part of connecting rod, connecting rod
The roughness of the end face of the body of rod of microcephaly and connecting rod meets design drawing requirement.
Further improvement lies in that: casting and forming temperature is 1200 degrees Celsius in the step 1, and the casting and forming time is 1-
1.5 hours, the casting and forming error in the step 1 was less than 0.6 millimeter.
Further improvement lies in that: need before casting and forming in the step 1 in the intracavitary connecting rod cap of casting mould type and
Connecting rod, which is in, is put into dusty material, and dusty material and metallic solution is made to form fracture circle after casting and forming and cooling treatment
Limit.
Further improvement lies in that: cooling treatment is cooling by water in the step 1, and water cooling temperature is 15-25 degrees Celsius,
Cooling time is 40-50 minutes.
Further improvement lies in that: first connecting rod blank is carried out in the step 2 to be heated to 580-620 degrees Celsius, after heating
Heat preservation 1.5-2.5 hours is carried out to connecting rod blank, then the connecting rod blank after heat preservation is carried out to be heated to 950-1000 degrees Celsius, is protected
It is 4-6 hours warm, connecting rod blank is cooled to 580 degrees Celsius again after heat preservation, is finally returned the connecting rod blank after cooling treatment
Temperature heating, heating temperature of rising again are 180 degrees Celsius, rise again and heat subsequent continuous isothermal holding 10-13 hours, quenched/tempered connecting rod hair is made
Base.
Further improvement lies in that: milling processing is at machining center milling processing or CNC milling machine milling in the step 3
One of reason, the milling processing surplus error is less than 0.15 millimeter.
Further improvement lies in that: the symmetry in the step 4 in coarse grinding treatment between quenched/tempered connecting rod blank upper and lower end face
It is 0.4 millimeter for error.
Further improvement lies in that: it first drills in the microcephaly of connecting rod in the step 5, obtains small head bore, then be with small head bore
Positioning datum drills in the major part of connecting rod, big end hole is obtained, then small head bore is carried out expanding treatment, finally on the basis of small head bore
Expanding treatment is carried out to big end hole, coarse positioning goes out the positions and dimensions of small head bore and big end hole.
Further improvement lies in that: connecting rod is placed on swollen off line in the step 7, swollen disconnected place is carried out to the major part of connecting rod
Reason, separate the major part of connecting rod, becomes the first major part separation unit and the second major part separation unit, then will even the first major part separation unit with
Second major part separation unit, which is bolted, to be integrated, then using angle method to tools for bolts ' pretension.
Further improvement lies in that: right boring mismachining tolerance is less than 0.05 millimeter in the step 8, run-out error 0.03-
0.05 millimeter, the surface roughness error in the step 9 is less than 0.02 millimeter.
Of the invention is effective are as follows: carrying out heat treatment by the connecting rod blank to casting and forming can be improved connecting rod blank
Rigidity, intensity, plasticity and toughness can improve that connecting rod blank interior tissue is uneven, not fine and close and internal chemical ingredient is inclined simultaneously
The larger problem of difference, improves the physical property of connecting rod blank, by the way that metal powder is added in mold cavity before casting and forming
The fracture boundary of formation can be convenient the later period it is swollen it is disconnected processing separation connecting rod major part when swollen disconnected effect it is good, be not in swollen fracture
Gap fragmentation problem, improves the efficiency and product qualified rate of swollen disconnected processing, and spiral shell can be improved to tools for bolts ' pretension by angle method
Bolt, can be with the precision of positioning datum in following process to the pretightning force of the major part of the connecting rod after separation, and the connecting rod processed is smart
It spends higher, it is possible to reduce connecting rod extends the service life of connecting rod in the loss of internal combustion engine.
Detailed description of the invention
Fig. 1 is process flow chart of the invention；
Fig. 2 is schematic structural view of the invention.
Specific embodiment
In order to realize invention technological means, reach purpose and effect is easy to understand, below with reference to specific implementation
Mode, the present invention is further explained.
A kind of IC engine link rod manufacturing process
Step 1: cast blank
The metallic solution of model 40Cr steel alloy is selected to be added in casting mould, in the intracavitary connecting rod cap of casting mould type and company
It is put into dusty material at shaft, dusty material and metallic solution is made to form fracture circle after casting and forming and cooling by water
Limit, is made connecting rod blank, and casting and forming error is less than 0.6 millimeter, and casting and forming temperature is 1200 degrees Celsius, when casting and forming
Between be 1.4 hours, water cooling temperature be 20 degrees Celsius, cooling time be 50 minutes；
Step 2: heat treatment
First connecting rod is carried out to be heated to 600 degrees Celsius, heat preservation 2 hours is carried out to connecting rod blank after heating, then by the company after heat preservation
Bar blank carries out being heated to 1000 degrees Celsius, keeps the temperature 5 hours, connecting rod blank is cooled to 580 degrees Celsius again after heat preservation, finally will
Connecting rod blank after cooling treatment carries out heating of rising again, and heating temperature of rising again is 180 degrees Celsius, rises again and heats at subsequent continuation of insurance temperature
Reason 12 hours, is made quenched/tempered connecting rod blank；
Step 3: milling processing
The end face of quenched/tempered connecting rod blank is subjected to milling processing in machining center, milling processing surplus error is less than 0.15 milli
Rice；
Step 4: corase grinding processing
The end face of milling treated quenched/tempered connecting rod blank is subjected to grinding machine coarse grinding treatment, guarantees quenched/tempered connecting rod blank upper and lower side
Symmetry between face is that error is 0.4 millimeter；
Step 5: drilling and reaming
It first drills in the microcephaly of connecting rod, obtains small head bore, then the major part using small head bore as positioning datum in connecting rod drills, and obtains big
Head bore, then small head bore is subjected to expanding treatment, expanding treatment finally is carried out to big end hole on the basis of small head bore, coarse positioning is small out
The positions and dimensions of head bore and big end hole；
Step 6: processing bolt hole
Carry out bore hole in the big both sides of head drill bolt hole of connecting rod, then by bolt hole, tapping carried out to bolt after bore hole, bolt hole with
The body of rod of connecting rod is parallel to each other, and two bolts hole are symmetrical on the basis of the body of rod of connecting rod；
Step 7: swollen disconnected processing
Connecting rod is placed on swollen off line, swollen disconnected processing is carried out to the major part of connecting rod, separated the major part of connecting rod, become the first major part
Separation unit and the second major part separation unit, then will even the first major part separation unit and the second major part separation unit are bolted is one
Body, then using angle method to tools for bolts ' pretension；
Step 8: the finishing of big end hole and small head bore
Right boring processing is carried out to small head bore with boring machine tool, right boring is carried out to big end hole as positioning datum using small head bore after processing and is added
Work, for right boring mismachining tolerance less than 0.05 millimeter, run-out error is 0.03 millimeter；
Step 9: end face finishing
The end face of the body of rod of the major part of connecting rod, the microcephaly of connecting rod and connecting rod is subjected to fine grinding, allows the major part of connecting rod, connecting rod
The roughness error of the end face of the body of rod of microcephaly and connecting rod is less than 0.02 millimeter.
Rigidity, intensity, plasticity and the toughness for the IC engine link rod that manufacturing process of the embodiment of the present invention produces are good by force, simultaneously
It is good that the fracture boundary of formation can be convenient later period swollen disconnected effect in swollen disconnected processing separation connecting rod cap and connecting rod shank, is not in swollen
Fracture gap fragmentation problem.
Of the invention is effective are as follows: carrying out heat treatment by the connecting rod blank to casting and forming can be improved connecting rod blank
Rigidity, intensity, plasticity and toughness can improve that connecting rod blank interior tissue is uneven, not fine and close and internal chemical ingredient is inclined simultaneously
The larger problem of difference, improves the physical property of connecting rod blank, by the way that metal powder is added in mold cavity before casting and forming
The fracture boundary of formation can be convenient the later period it is swollen it is disconnected processing separation connecting rod major part when swollen disconnected effect it is good, be not in swollen fracture
Gap fragmentation problem, improves the efficiency and product qualified rate of swollen disconnected processing, and spiral shell can be improved to tools for bolts ' pretension by angle method
Bolt, can be with the precision of positioning datum in following process to the pretightning force of the major part of the connecting rod after separation, and the connecting rod processed is smart
It spends higher, it is possible to reduce connecting rod extends the service life of connecting rod in the loss of internal combustion engine.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (10)
1. a kind of IC engine link rod manufacturing process, it is characterised in that: the following steps are included:
Step 1: cast blank
It selects the metallic solution of model 40Cr steel alloy to carry out casting and forming, carries out cooling treatment, the company of being made after casting and forming
Bar blank；
Step 2: heat treatment
Connecting rod blank is heated, connecting rod blank is kept the temperature after heating, then the connecting rod blank after heat preservation is heated,
Heat preservation and cooling treatment, finally carry out heating of rising again for the connecting rod blank after cooling treatment, rise again and heat subsequent continuous isothermal holding,
Quenched/tempered connecting rod blank is made；
Step 3: milling processing
Quenched/tempered connecting rod blank is subjected to milling processing；
Step 4: corase grinding processing
Milling treated quenched/tempered connecting rod blank is subjected to grinding machine coarse grinding treatment, obtains connecting rod；
Step 5: drilling and reaming
The microcephaly of the major part of connecting rod and connecting rod is subjected to drilling processing, obtains big end hole and small head bore, then by big end hole and microcephaly
Hole carries out expanding treatment；
Step 6: processing bolt hole
Carry out bore hole in the big both sides of head drill bolt hole of connecting rod, then by bolt hole, tapping carried out to bolt after bore hole, bolt hole with
The body of rod of connecting rod is parallel to each other, and two bolts hole are symmetrical on the basis of the body of rod of connecting rod；
Step 7: swollen disconnected processing
Connecting rod is put on swollen off line, swollen disconnected processing is carried out to the major part of connecting rod, separated the major part of connecting rod, become the first major part
Separation unit and the second major part separation unit, then the first major part separation unit and the second major part separation unit are bolted；
Step 8: the finishing of big end hole and small head bore
Right boring processing is carried out to small head bore with boring machine tool, right boring is carried out to big end hole as positioning datum using small head bore after processing and is added
Work；
Step 9: end face finishing
The end face of the body of rod of the major part of connecting rod, the microcephaly of connecting rod and connecting rod is subjected to fine grinding, allows the major part of connecting rod, connecting rod
The roughness of the end face of the body of rod of microcephaly and connecting rod meets design drawing requirement.
2. a kind of IC engine link rod manufacturing process according to claim 1, it is characterised in that: be cast as in the step 1
Type temperature is 1200 degrees Celsius, and the casting and forming time is 1-1.5 hour, the casting and forming error in the step 1 for less than
0.6 millimeter.
3. a kind of IC engine link rod manufacturing process according to claim 1, it is characterised in that: be cast as in the step 1
It needs to be put into dusty material at casting mould type intracavitary the first major part separation unit and the second major part separation unit before type, makes powder
Powder material and metallic solution are forming fracture boundary after casting and forming and cooling treatment.
4. a kind of IC engine link rod manufacturing process according to claim 1, it is characterised in that: at cooling in the step 1
Reason is cooling by water, and water cooling temperature is 15-25 degrees Celsius, and cooling time is 40-50 minutes.
5. a kind of IC engine link rod manufacturing process according to claim 1, it is characterised in that: first will be even in the step 2
Bar blank carries out being heated to 580-620 degrees Celsius, carries out heat preservation 1.5-2.5 hours to connecting rod blank after heating, then will be after heat preservation
Connecting rod blank be heated to 950-1000 degrees Celsius, keep the temperature 4-6 hours, connecting rod blank be cooled to 580 again after heat preservation and is taken the photograph
Connecting rod blank after cooling treatment is finally carried out heating of rising again by family name's degree, and heating temperature of rising again is 180 degrees Celsius, heating of rising again
Subsequent continuous isothermal holding 10-13 hours, quenched/tempered connecting rod blank is made.
6. a kind of IC engine link rod manufacturing process according to claim 1, it is characterised in that: in the step 3 at milling
Reason is one of machining center milling processing or CNC milling machine milling processing, and the milling processing surplus error is less than
0.15 millimeter.
7. a kind of IC engine link rod manufacturing process according to claim 1, it is characterised in that: in the step 4 at corase grinding
Symmetry in reason between quenched/tempered connecting rod blank upper and lower end face is that error is 0.4 millimeter.
8. a kind of IC engine link rod manufacturing process according to claim 1, it is characterised in that: first even in the step 5
The microcephaly of bar drills, and obtains small head bore, then the major part using small head bore as positioning datum in connecting rod drills, and obtains big end hole, then will
Small head bore carries out expanding treatment, finally carries out expanding treatment to big end hole on the basis of small head bore, and coarse positioning goes out small head bore and big
The positions and dimensions of head bore.
9. a kind of IC engine link rod manufacturing process according to claim 1, it is characterised in that: by connecting rod in the step 7
It is placed on swollen off line and swollen disconnected processing is carried out to the major part of connecting rod, separate the major part of connecting rod, become the first major part separation unit and the
Two major part separation units, then even the first major part separation unit and the second major part separation unit are bolted and are integrated, then use
Angle method is to tools for bolts ' pretension.
10. a kind of IC engine link rod manufacturing process according to claim 1, it is characterised in that: right boring in the step 8
Mismachining tolerance is less than 0.05 millimeter, and run-out error is 0.03-0.05 millimeters, and the surface roughness error in the step 9 is small
In 0.02 millimeter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810929944.5A CN109014783A (en) | 2018-08-15 | 2018-08-15 | A kind of IC engine link rod manufacturing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810929944.5A CN109014783A (en) | 2018-08-15 | 2018-08-15 | A kind of IC engine link rod manufacturing process |
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| CN109014783A true CN109014783A (en) | 2018-12-18 |
Family
ID=64630414
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| CN201810929944.5A Pending CN109014783A (en) | 2018-08-15 | 2018-08-15 | A kind of IC engine link rod manufacturing process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113146154A (en) * | 2021-04-12 | 2021-07-23 | 徐州新大隆化工泵业制造有限公司 | Processing technology of connecting rod of high-pressure plunger pump |
| CN115519324A (en) * | 2022-11-03 | 2022-12-27 | 苏州耀玮彤机械有限公司 | A surface precision milling method for automotive special-shaped hardware parts |
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| GB2296752A (en) * | 1995-01-09 | 1996-07-10 | Fischer Georg Fahrzeugtech | Method of manufacturing a connecting rod |
| CN101352795A (en) * | 2007-07-27 | 2009-01-28 | 云南西仪工业股份有限公司 | Expansion processing method of connecting rod for automobile engine |
| CN102626770A (en) * | 2012-04-17 | 2012-08-08 | 江苏大学 | Manufacturing method of splitting-type connecting rod |
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2018
- 2018-08-15 CN CN201810929944.5A patent/CN109014783A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2296752A (en) * | 1995-01-09 | 1996-07-10 | Fischer Georg Fahrzeugtech | Method of manufacturing a connecting rod |
| CN101352795A (en) * | 2007-07-27 | 2009-01-28 | 云南西仪工业股份有限公司 | Expansion processing method of connecting rod for automobile engine |
| CN102626770A (en) * | 2012-04-17 | 2012-08-08 | 江苏大学 | Manufacturing method of splitting-type connecting rod |
Non-Patent Citations (3)
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| 干勇等: "《现代连续铸钢实用手册》", 31 March 2010, 冶金工业出版社 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113146154A (en) * | 2021-04-12 | 2021-07-23 | 徐州新大隆化工泵业制造有限公司 | Processing technology of connecting rod of high-pressure plunger pump |
| CN115519324A (en) * | 2022-11-03 | 2022-12-27 | 苏州耀玮彤机械有限公司 | A surface precision milling method for automotive special-shaped hardware parts |
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