CN85106018B - Combination process for casting and forging of connecting rod - Google Patents
Combination process for casting and forging of connecting rod Download PDFInfo
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- CN85106018B CN85106018B CN85106018A CN85106018A CN85106018B CN 85106018 B CN85106018 B CN 85106018B CN 85106018 A CN85106018 A CN 85106018A CN 85106018 A CN85106018 A CN 85106018A CN 85106018 B CN85106018 B CN 85106018B
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- alloy
- connecting rod
- forging
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- casting
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The present invention relates to a combination technology for casting and forging a connecting rod, which belongs to the heat processing of non-ferrous metal. The connecting rod is made of an alloy of aluminium, silicon and copper; cast aluminium alloy cast by a metal mould has the disadvantages of noncoherent organization and poor strength and abradability. In order to overcome the disadvantages, blanks are cast by the metal mould and are molded by swaging. Because the silica content of the alloy can reach as high as 8 to 10%, the plasticity of the alloy is extremely poor. The present invention has a series of reasonable technology measures so as to successfully forge blanks of the connecting rod, and the strength index, the plasticity index, the abrasion resistance and the density of the cast and forged connecting rod are greatly superior to the connecting rod cast by the metal mould.
Description
The present invention relates to a kind of cast forging process method of Al-Si-Cu alloy connecting rod, it belongs to the hot-working of non-ferrous metal.
At present, combination process for casting and forging only adopts on ferrous metal, as cast steel, spheroidal graphite cast-iron etc., casts blank earlier, and then die forging.In the aluminium alloy of general distortion, the content of silicon is 0.5～1.2%, when the content of silicon in the alloy increases, will reduce the plasticity of alloy significantly, but to silicon content can up to the workpiece of 8～10% Al-Si-Cu alloy (connecting rod for example, as shown in Figure 3), its plasticity is poorer, it is adopted combination process for casting and forging is very difficult, occurs crackle often, and product is scrapped in a large number.General just adopt die cast to form abroad, but its tissue looseness, intensity and wearability are all relatively poor, and as the connecting rod in the U.S. TRANE compressor, its material also be the inductile Al-Si-Cu alloy, and its employing die cast forms.Have in order to improve its performance, adopt defective that the high temperature insostatic pressing (HIP) method eliminates foundry goods inside improving the reliability of foundry goods, but need the high treatment facility of price, pressure needs at 1000 kilograms/centimeter
2More than, even if like this, the performance improvement of product is also limited.
The casting and forging combined technique that the objective of the invention is to overcome the problems referred to above of the prior art and a kind of Al-Si-Cu alloy connecting rod is provided, its silicon content can be up to 8～10%, the connecting rod that mechanical performance forms considerably beyond die cast.
Task of the present invention is finished by following measures: Al-Si-Cu alloy itself is a cast aluminium alloy that casting character is good, earlier adopt metal pattern to cast blank Al-Si-Cu alloy, after casting blank, carry out die-forging forming again, the contour forging technique parameter is: the forging heating-up temperature is 400 to 450 ℃, and the deformation extent of alloy is controlled in 45%.Forging heating optimum temperature range is 420 ° ± 5 ℃.
Accompanying drawing 3 is the schematic diagram of connecting rod.
The present invention describes in detail embodiment below with reference to accompanying drawing: silicon content can be as shown in table 1 up to the composition of the Al-Si-Cu alloy of 8-10%.Its plasticity ratio inductile alloy of aluminium alloy that silicon content is so high is lower.It also is an important breakthrough of Forging Technology that the inductile cast aluminium alloy blank that silicon content is so high adopts forging method to produce.In order to grasp the performance of Al-Si-Cu alloy, a large amount of tests have been done, before the die forging, blank is an alloy-steel casting, adopts the free compression method, has determined the plasticity of this alloy, as shown in Figure 1, therefore, a kind of combination process for casting and forging of Al-Si-Cu alloy connecting rod can be applicable on the inductile Al-Si-Cu alloy, and silicon content can be up to 8-10%.By accompanying drawing 1 as can be known, as surpassing distortion 45%, the workpiece under most of temperature (connecting rod) all ftractures, and greater than more than 450 ℃ during jumping-up, the permission deformation extent that crackle does not appear in workpiece is more and more littler in temperature.Therefore the deformation extent of alloy is controlled in 45%, and forging deformation still is feasible in common open die.By accompanying drawing 2 as can be known, alloy is in the time of 400 ℃, the upset force minimum, at this moment compare with Fig. 1, its plasticity index is also higher, therefore considers in the production practices, workpiece takes out from stove and is placed on the mould, greatly about 20 ℃, so the forging heating-up temperature is taken as 400 to 450 ℃, optimum temperature range is 420 ± 5 ℃ at the temperature drop in season in spring and autumn.
The present invention and prior art U.S. TRANE compressor connecting bar (same material) are compared, and to have advantage as shown in table 2.As shown in Table 2, the combination process for casting and forging that we adopt is compared with the die cast technology of the U.S., and intensity improves 24%, plasticity index improves 104%, wearability improves 54%～150%, and density increases by 6%, and every performance indications all substantially exceed Unite States Standard and the data of surveying in kind thereof.
Table 1
| Chemical element | Silicon | Copper | Iron | Manganese | Nickel | Magnesium | Zinc | Titanium | Other impurity | Aluminium |
| Content % | 8.0～10.0 | 3.0～4.5 | ≤1.0 | ≤0.5 | ≤0.5 | ≤0.5 | ≤1.0 | ≤0.25 | ≤0.5 | Surplus |
Table 2
Annotate: σ
b: strength degree
δ
3: percentage elongation
Claims (2)
1, a kind of combination process for casting and forging of Al-Si-Cu alloy connecting rod, the invention is characterized in that silicon content can be up to 8～10% inductile alloy, adopt the metal pattern strand earlier, again through die-forging forming, the contour forging technique parameter is: the forging heating-up temperature is 400 to 450 ℃, and the deformation extent of alloy is controlled in 45%.
2, combination process for casting and forging according to claim 1 is characterized in that forging heating optimum temperature range is 420 ± 5 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85106018A CN85106018B (en) | 1985-07-22 | 1985-07-22 | Combination process for casting and forging of connecting rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85106018A CN85106018B (en) | 1985-07-22 | 1985-07-22 | Combination process for casting and forging of connecting rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85106018A CN85106018A (en) | 1987-01-21 |
| CN85106018B true CN85106018B (en) | 1988-03-30 |
Family
ID=4794831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85106018A Expired CN85106018B (en) | 1985-07-22 | 1985-07-22 | Combination process for casting and forging of connecting rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85106018B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2958193B1 (en) * | 2010-04-06 | 2012-06-29 | Saint Jean Ind | PROCESS FOR MANUFACTURING LIGHT ALLOY FORGED PARTS INCORPORATING FULL OR DRAWN THICKNESS SECTIONS |
| CN108188336B (en) * | 2017-12-29 | 2019-07-02 | 宣城市安工大工业技术研究院有限公司 | A kind of engine piston connecting rod precision hot-working method |
-
1985
- 1985-07-22 CN CN85106018A patent/CN85106018B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN85106018A (en) | 1987-01-21 |
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