CN109209673A - engine piston blank and its processing method - Google Patents
engine piston blank and its processing method Download PDFInfo
- Publication number
- CN109209673A CN109209673A CN201811325197.0A CN201811325197A CN109209673A CN 109209673 A CN109209673 A CN 109209673A CN 201811325197 A CN201811325197 A CN 201811325197A CN 109209673 A CN109209673 A CN 109209673A
- Authority
- CN
- China
- Prior art keywords
- annular groove
- head
- riser
- aditus laryngis
- top surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
-
- 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
- B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/26—Pistons having combustion chamber in piston head
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The present invention discloses a kind of engine piston blank, including skirt section and head, the top surface on head is provided with riser, the top surface on head is provided with the annular groove to lower recess around riser, the bottom surface of annular groove is close to the combustion chamber bottom surface of piston finished product, the inner sidewall of annular groove is the circumferential lateral surface of riser, and the lateral wall of annular groove is to process positioning surface and the aditus laryngis close to piston finished product, processes between positioning surface and aditus laryngis and is provided with machining allowance layer between the bottom surface of annular groove and the bottom surface of combustion chamber.Directly cast out the general shape of combustion chamber and aditus laryngis, refine regional area metallographic structure, it is easy to accomplish, effect is more preferable and cost is lower, its fatigue strength is improved, the purpose for substantially dropping aditus laryngis Cracking Failure risk, and the processing positioning surface processed using the black skin to form out as subsequent mechanical are realized, subsequent machining is carried out, piston mass is improved.The invention also discloses a kind of processing methods of above-mentioned engine piston blank.
Description
Technical field
The present invention relates to engine manufacturing fields, more particularly to a kind of engine piston blank.In addition, the present invention also relates to
And a kind of processing method of engine piston blank.
Background technique
Currently, engine piston generallys use lower core pulling metal mold gravity casting technique, advantage is exactly to have complied with piston
The thick big feature in the thin head in skirt section, can preferably realize the consecutive solidification of piston blank casting in the process from bottom to top, be conducive to
Prevent the generation of piston crown shrinkage porosite and gas hole defect, preferably ensures the castability of product.But the disadvantage is that piston crown
Thickness it is most of for other relatively thin regions such as skirt section, final solidified, setting time is long, and crystal grain is grown up sufficiently, makes
At the region material organizational coarseness, especially combustion chamber throat part material organizational coarseness, with the continuous improvement for firing pressure,
Requirement to the fatigue at high temperature performance of piston crown combustion chamber throat part material is higher, and aditus laryngis fatigue crack, head is caused to open
The situation for the failures such as splitting happens occasionally.
Currently, piston blank generallys use core pulling metal mold gravity casting under traditional top riser side gate, riser is direct
It is set to the top surface on blank head, combustion chamber and aditus laryngis needs are processed completely by way of machining, machining allowance
It is larger, take a long time.Since the combustion chamber throat that machining comes out is in the big position of thickness below riser, material structure is thick
Greatly, fatigue strength is lower, and potential Cracking Failure risk is larger.
Therefore, how a kind of engine blank can be avoided the failure conditions such as aditus laryngis fatigue crack and dehiscence in the head is provided
Piston is a technical problem that technical personnel in the field need to solve at present.
Summary of the invention
The object of the present invention is to provide a kind of engine piston blanks effectively to avoid aditus laryngis tired by the way that annular groove is arranged
The failure conditions such as crackle and dehiscence in the head save material, improve piston finished product quality.It is a further object of the present invention to provide one kind
The processing method of above-mentioned engine piston blank.
In order to solve the above technical problems, the present invention provides a kind of engine piston blank, including skirt section and head, the head
The top surface in portion is provided with riser, and the top surface on the head is provided with the annular groove to lower recess around the riser, the ring
Close to the combustion chamber bottom surface of piston finished product, the inner sidewall of the annular groove is the circumferential lateral surface of the riser, institute for the bottom surface of shape slot
The lateral wall for stating annular groove is to process positioning surface and the aditus laryngis close to piston finished product, between the processing positioning surface and the aditus laryngis
And the annular groove bottom surface and the combustion chamber bottom surface between be provided with machining allowance layer.
Preferably, the processing positioning surface and the riser circumferential lateral surface are obliquely installed, the inner sidewall of the annular groove
The distance between lateral wall is gradually increased from bottom surface to opening.
Preferably, the top surface on the head is provided with the annular slope around the annular groove, the processing positioning surface and
The intersection of the annular slope is lower than the top surface on the head, and described add is provided between the annular slope and the aditus laryngis
Spare time measures layer.
Preferably, intermediate incline is provided between the circumferential lateral surface of the riser and the bottom surface of the annular groove.
Preferably, the distance between the processing positioning surface and the aditus laryngis protrusion are 1.5 to 2.5 millimeters, the processing
Positioning surface and the angle of central axes are 30 degree to 45 degree, and the intersection of the processing positioning surface and the annular slope is away from the ring
The distance of shape groove bottom is 8 to 15 millimeters.
Preferably, the circumferential lateral surface on the head and top surface are provided with machining allowance layer.
The present invention provides a kind of processing method of engine piston blank, comprising steps of
Molten metal, integrally casting shaping skirt section and head are perfused into mold, the head top surface formed riser and
Around the annular groove of the riser, the bottom surface of the annular groove close to the combustion chamber bottom surface of piston finished product, the annular groove it is interior
Side wall is the circumferential lateral surface of the riser, and the lateral wall of the annular groove is to process positioning surface and the aditus laryngis close to piston finished product；
The cooling mold, and regional area metallographic is carried out by water cooling in the position that the mold contacts the annular groove
Structure refinement；
The machining allowance layer being machined based on the processing positioning surface in remove feeders and the annular groove, in institute
It states head top surface and forms combustion chamber and aditus laryngis；
The machining allowance layer on machining removal piston blank surface, forms piston finished product.
Preferably, the integrally casting shaping skirt section and head further include:
The annular slope for surrounding the annular groove, the processing positioning surface and the annular are formed in the top surface on the head
The intersection on inclined-plane is lower than the top surface on the head；
Intermediate incline is formed between the circumferential lateral surface of the riser and the bottom surface of the annular groove.
The present invention provides a kind of engine piston blank, including skirt section and head, and the top surface on head is provided with riser, head
Top surface be provided with the annular groove to lower recess around riser, the bottom surface of annular groove close to the combustion chamber bottom surface of piston finished product,
The inner sidewall of annular groove is the circumferential lateral surface of riser, and the lateral wall of annular groove is to process positioning surface and the larynx close to piston finished product
Mouthful, it processes between positioning surface and aditus laryngis and is provided with machining allowance layer between the bottom surface of annular groove and the bottom surface of combustion chamber.
Processing method is that molten metal, integrally casting shaping skirt section and head are perfused into mold, forms riser in the top surface on head and encloses
Around the annular groove of riser；Cooling mold, and regional area metallographic structure is carried out by water cooling in the position of mold contact annular groove
Refinement；The machining allowance layer being machined in remove feeders and annular groove based on processing positioning surface, forms in head top surface
Combustion chamber and aditus laryngis；The machining allowance layer on machining removal piston blank surface, forms piston finished product.
The general shape of combustion chamber and aditus laryngis is directly cast out, refines regional area metallographic structure, easy to accomplish, effect is more
Good and cost is lower, improves its fatigue strength, realizes the purpose for substantially dropping aditus laryngis Cracking Failure risk, and utilize and form out
The processing positioning surface processed as subsequent mechanical of black skin, carry out subsequent machining.The Redundancy Design of blank is eliminated,
The machining allowance for reducing combustion chamber regions reduces the abrasion of machining tool, and stock utilization improves, material cost drop
It is low；The water flowing for increasing combustion chamber and throat region is cooling, and the casting solidification time shortens, and piston blank production efficiency improves.And
Processing positioning surface is not arranged in below riser, is conducive to keep the temperature, riser greatly reduces head shrinkage porosite and incline to head feeding
To improving piston mass.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of specific embodiment of engine piston blank provided by the present invention；
Fig. 2 is a kind of diagrammatic cross-section of specific embodiment of engine piston blank provided by the present invention.
Specific embodiment
Core of the invention is to provide a kind of engine piston blank, by the way that annular groove is arranged, effectively avoids aditus laryngis tired
The failure conditions such as crackle and dehiscence in the head save material, improve piston finished product quality.Another core of the invention is to provide one kind
The processing method of above-mentioned engine piston blank.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Fig. 1 and Fig. 2 are please referred to, Fig. 1 is a kind of specific embodiment of engine piston blank provided by the present invention
Structural schematic diagram；Fig. 2 is a kind of diagrammatic cross-section of specific embodiment of engine piston blank provided by the present invention.
The specific embodiment of the invention provides a kind of engine piston blank, including skirt section 2 and head 1, the top surface on head 1
It is provided with riser 3, i.e., when piston blank is placed vertically, head 1 is located at the top in skirt section 2, and riser 3 is located at the top on head 1, most
End form at piston finished product head top surface setting combuster 11 and aditus laryngis 12.
The top surface on head 1 is provided with the annular groove 4 to lower recess around riser 3, annular groove 4 has bottom surface, inside
Wall, lateral wall and opening, the opening upwards of annular groove 4, the bottom surface of annular groove 4 close to 11 bottom surface of the combustion chamber of piston finished product, and
The bottom surface of annular groove 4 is lower than the top surface on head 1, and the inner sidewall of annular groove 4 is the circumferential lateral surface of riser 3, the lateral wall of annular groove 4
For processing positioning surface 41 and the aditus laryngis 12 of close piston finished product, between the processing positioning surface 41 and aditus laryngis 12 and bottom of annular groove 4
Machining allowance layer is provided between face and the bottom surface of combustion chamber 11.
Processing method is that molten metal, integrally casting shaping skirt section 2 and head 1 are perfused into mold, the top surface shape on head 1
At riser 3 and around the annular groove 4 of riser 3, the structure of annular groove 4 as described above, the bottom surface of i.e. annular groove 4 close to piston finished product
11 bottom surface of combustion chamber, the inner sidewall of annular groove 4 is the circumferential lateral surface of riser 3, and the lateral wall of annular groove 4 is processing positioning surface 41
And close to the aditus laryngis 12 of piston finished product.Then mold is cooled down, and part is carried out by water cooling in the position of mold contact annular groove 4
Region metallographic structure refinement.The machining allowance being machined based on processing positioning surface 41 in remove feeders 3 and annular groove 4
Layer forms combustion chamber 11 and aditus laryngis 12 in 1 top surface of head.The machining allowance layer on machining removal piston blank surface, forms
Piston finished product.
The general shape for directly casting out combustion chamber 11 and aditus laryngis 12, since the material at 12 position of combustion chamber 11 and aditus laryngis is straight
It connects and is contacted with mold, mold solidifies it quickly in such a way that water flowing is cooling, regional area metallographic structure is refined, compared to complete
The metallographic structure refinement of portion's blank is easier realization, and effect is more preferable and cost is lower, improves its fatigue strength, realizes and substantially drop
The purpose of 12 Cracking Failure risk of aditus laryngis, and the processing positioning surface processed using the black skin to form out as subsequent mechanical
41, carry out subsequent machining.The Redundancy Design for eliminating blank reduces the machining allowance in 11 region of combustion chamber, reduces
The abrasion of machining tool, stock utilization improve, and material cost reduces；Increase 12 region of combustion chamber 11 and aditus laryngis
Water flowing is cooling, and the casting solidification time shortens, and piston blank production efficiency improves.And processing positioning surface 41 is not arranged under riser 3
Side, is conducive to keep the temperature, and riser 3 greatly reduces 1 shrinkage porosite of head tendency, improve piston mass to 1 feeding of head.
Specifically, it in order to match the shape of combustion chamber 11, processes positioning surface 41 and 3 circumferential lateral surface of riser is obliquely installed,
It is tapered surface, the distance between inner sidewall and lateral wall of annular groove 4 are gradually increased from bottom surface to opening.
In order to match the shape of aditus laryngis 12, the top surface on head 1 is provided with the annular slope 42 around annular groove 4, is equally
One tapered surface, the inner annular edge of annular slope 42 is the intersection for processing positioning surface 41 and annular slope 42, and is lower than head 1
Top surface, the outer ring edge of annular slope 42 is the intersection of annular slope 42 and 1 top surface of head, i.e., on the basis of horizontal plane
When, the tilt angle for processing positioning surface 41 is bigger compared to the tilt angle of annular slope 42, keeps annular slope 42 and processing fixed
The shape of plane 41 is matched with the general shape of combustion chamber 11 and aditus laryngis 12, is again provided between annular slope 42 and aditus laryngis 12
Machining allowance layer.
Further, intermediate incline 43 is provided between the circumferential lateral surface of riser 3 and the bottom surface of annular groove 4.Processing side
Method is to form the annular around annular groove 4 in the engineering on integrally casting shaping skirt section 2 and head 1, while in the top surface on head 1
Inclined-plane 42, the intersection for processing positioning surface 41 and annular slope 42 are lower than the top surface on head 1, and the circumferential lateral surface of riser 3 with
Intermediate incline 43 is formed between the bottom surface of annular groove 4.
On the basis of the engine piston blank that the specific embodiment of the invention provides, processing positioning surface 41 and aditus laryngis 12
The distance of machining allowance d between protrusion is 1.5 to 2.5 millimeters, the size of riser 3 according to the shape at 11 top of combustion chamber and with
The distance of top surface is designed, it is ensured that 11 tip of combustion chamber does not have shrinkage defect, processes positioning surface 41 and the angle a of central axes is
30 degree to 45 degree, processing the intersection of positioning surface 41 and annular slope 42 away from the distance h of 4 bottom surface of annular groove is 8 to 15 millimeters, root
According to the size of riser 3, it is advisable using deeper design, more to reduce the machining allowance of combustion chamber 11.It can also be according to feelings
Condition adjusts the shape of the size of each position, within the scope of the present invention.
On the basis of the engine piston blank that above-mentioned each specific embodiment provides, the peripheral side on head 1 is needed
Each face in face and top surface and skirt section 2 is provided with machining allowance layer.
Engine blank piston provided by the present invention and its processing method are described in detail above.It answers herein
With a specific example illustrates the principle and implementation of the invention, the explanation of above example is only intended to help to manage
Solve method and its core concept of the invention.It should be pointed out that for those skilled in the art, not departing from
, can be with several improvements and modifications are made to the present invention under the premise of the principle of the invention, these improvement and modification also fall into this hair
In bright scope of protection of the claims.
Claims (8)
1. a kind of engine piston blank, including skirt section (2) and head (1), which is characterized in that the top surface of the head (1) is set
It is equipped with riser (3), the top surface of the head (1) is provided with the annular groove (4) to lower recess around the riser (3), described
The bottom surface of annular groove (4) is the riser close to combustion chamber (11) bottom surface of piston finished product, the inner sidewall of the annular groove (4)
(3) circumferential lateral surface, the lateral wall of the annular groove (4) are to process positioning surface (41) and the aditus laryngis (12) close to piston finished product,
Between processing positioning surface (41) and the aditus laryngis (12) and the bottom surface and the combustion chamber (11) of the annular groove (4)
Machining allowance layer is provided between bottom surface.
2. engine piston blank according to claim 1, which is characterized in that the processing positioning surface (41) and described emit
Mouthful (3) circumferential lateral surface is obliquely installed, the distance between inner sidewall and lateral wall of the annular groove (4) from bottom surface to opening by
It is cumulative big.
3. engine piston blank according to claim 2, which is characterized in that the top surface of the head (1), which is provided with, encloses
The intersection of annular slope (42) around the annular groove (4), processing positioning surface (41) and the annular slope (42) is low
The machining allowance layer is provided between the top surface of the head (1), the annular slope (42) and the aditus laryngis (12).
4. engine piston blank according to claim 3, which is characterized in that the circumferential lateral surface of the riser (3) and institute
It states and is provided with intermediate incline (43) between the bottom surface of annular groove (4).
5. engine piston blank according to claim 4, which is characterized in that the processing positioning surface (41) and the larynx
The distance between mouth (12) protrusion is 1.5 to 2.5 millimeters, and the angle of processing positioning surface (41) and central axes is 30 degree to 45
Degree, it is described processing positioning surface (41) and the annular slope (42) intersection away from the distance of the annular groove (4) bottom surface for 8 to
15 millimeters.
6. according to claim 1 to engine piston blank described in 5 any one, which is characterized in that outside the head (1)
All sides and top surface are provided with machining allowance layer.
7. a kind of processing method of engine piston blank, which is characterized in that comprising steps of
Molten metal is perfused into mold, integrally casting shaping skirt section (2) and head (1) form in the top surface of the head (1) and emit
Mouth (3) and the annular groove (4) for surrounding the riser (3), the bottom surface of the annular groove (4) is close to the combustion chamber (11) of piston finished product
Bottom surface, the inner sidewall of the annular groove (4) are the circumferential lateral surface of the riser (3), and the lateral wall of the annular groove (4) is processing
The aditus laryngis (12) of positioning surface (41) and close piston finished product；
The cooling mold, and regional area metallographic is carried out by water cooling in the position that the mold contacts the annular groove (4)
Structure refinement；
The machining allowance being machined based on processing positioning surface (41) in remove feeders (3) and the annular groove (4)
Layer forms combustion chamber (11) and aditus laryngis (12) in the head (1) top surface；
The machining allowance layer on machining removal piston blank surface, forms piston finished product.
8. processing method according to claim 7, which is characterized in that the integrally casting shaping skirt section (2) and head (1)
Further include:
The annular slope (42) for surrounding the annular groove (4), the processing positioning surface (41) are formed in the top surface of the head (1)
It is lower than the top surface of the head (1) with the intersection of the annular slope (42)；
Intermediate incline (43) are formed between the circumferential lateral surface of the riser (3) and the bottom surface of the annular groove (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811325197.0A CN109209673A (en) | 2018-11-08 | 2018-11-08 | engine piston blank and its processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811325197.0A CN109209673A (en) | 2018-11-08 | 2018-11-08 | engine piston blank and its processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109209673A true CN109209673A (en) | 2019-01-15 |
Family
ID=64995130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811325197.0A Pending CN109209673A (en) | 2018-11-08 | 2018-11-08 | engine piston blank and its processing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109209673A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352432A (en) * | 2022-01-11 | 2022-04-15 | 湖南江滨机器（集团）有限责任公司 | Piston blank, piston forming module and multi-path sequential cold control forming method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08117917A (en) * | 1994-10-20 | 1996-05-14 | Yamaha Motor Co Ltd | Forging billet for piston of engine |
| CN2834742Y (en) * | 2005-10-08 | 2006-11-08 | 山东滨州渤海活塞股份有限公司 | Piston blank with inner cooling channel being cast by liquid extrusion casting process |
| CN104028984A (en) * | 2014-06-10 | 2014-09-10 | 山东滨州渤海活塞股份有限公司 | Method for manufacturing piston with re-molten reinforced combustion chamber throat |
| CN206104815U (en) * | 2016-08-08 | 2017-04-19 | 湖南江滨机器（集团）有限责任公司 | A casting die utensil that is used for shaping piston blank top surface and combustion chamber |
| CN206200085U (en) * | 2016-12-02 | 2017-05-31 | 湖南江滨机器（集团）有限责任公司 | A kind of piston blank casting die and its die cap |
-
2018
- 2018-11-08 CN CN201811325197.0A patent/CN109209673A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08117917A (en) * | 1994-10-20 | 1996-05-14 | Yamaha Motor Co Ltd | Forging billet for piston of engine |
| CN2834742Y (en) * | 2005-10-08 | 2006-11-08 | 山东滨州渤海活塞股份有限公司 | Piston blank with inner cooling channel being cast by liquid extrusion casting process |
| CN104028984A (en) * | 2014-06-10 | 2014-09-10 | 山东滨州渤海活塞股份有限公司 | Method for manufacturing piston with re-molten reinforced combustion chamber throat |
| CN206104815U (en) * | 2016-08-08 | 2017-04-19 | 湖南江滨机器（集团）有限责任公司 | A casting die utensil that is used for shaping piston blank top surface and combustion chamber |
| CN206200085U (en) * | 2016-12-02 | 2017-05-31 | 湖南江滨机器（集团）有限责任公司 | A kind of piston blank casting die and its die cap |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352432A (en) * | 2022-01-11 | 2022-04-15 | 湖南江滨机器（集团）有限责任公司 | Piston blank, piston forming module and multi-path sequential cold control forming method |
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Application publication date: 20190115 |