CN204419382U - A kind of overall forging steel piston - Google Patents
A kind of overall forging steel piston Download PDFInfo
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- CN204419382U CN204419382U CN201520066592.7U CN201520066592U CN204419382U CN 204419382 U CN204419382 U CN 204419382U CN 201520066592 U CN201520066592 U CN 201520066592U CN 204419382 U CN204419382 U CN 204419382U
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- forged steel
- ring groove
- skirt
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 19
- 239000010959 steel Substances 0.000 title claims abstract description 19
- 238000005242 forging Methods 0.000 title description 2
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 239000000446 fuel Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 52
- 238000003466 welding Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- F02F3/0015—Multi-part pistons
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
本实用新型提供了一种整体锻钢活塞，它包括活塞头部和活塞裙部，活塞头部和活塞裙部之间形成封闭的冷却油腔，冷却油腔通过进、出油孔与外部相通，活塞的环槽全部设在活塞裙部上，所述环槽包括位置在上的两个气环槽和位置在下的一个油环槽，销座设在活塞裙部上，所述销座上端与活塞头部的下端通过过盈配合连接在一起；活塞头部上端外圆部分或全部与活塞裙部火力岸上端内腔形成过盈配合，在活塞顶面有单面焊缝。该活塞结构简单，油耗低，可以减少发动机的有害排放，安全可靠。
The utility model provides an integral forged steel piston, which comprises a piston head and a piston skirt, a closed cooling oil chamber is formed between the piston head and the piston skirt, and the cooling oil chamber communicates with the outside through oil inlet and outlet holes. , the ring grooves of the piston are all arranged on the piston skirt, and the ring grooves include two gas ring grooves at the top and an oil ring groove at the bottom, the pin seat is arranged on the piston skirt, and the upper end of the pin seat It is connected with the lower end of the piston head through interference fit; part or all of the outer circle of the upper end of the piston head forms an interference fit with the inner cavity of the upper end of the piston skirt, and there is a single-sided weld on the top surface of the piston. The piston has simple structure, low fuel consumption, can reduce harmful emission of the engine, and is safe and reliable.
Description
技术领域 technical field
本实用新型涉及的是一种活塞，尤其是一种整体锻钢活塞。 The utility model relates to a piston, in particular to an integral forged steel piston.
背景技术 Background technique
近十几年来，发动机设计、制造技术得以迅速提高，特别是柴油发动机都在向大功率、高负荷方向发展，强化程度不断提高，爆发力已经超过20MPa，同时排放要求越来越严格，原铝制活塞虽然有重量轻的优点，但是铝合金材料只能在350℃下稳定工作，虽然采取了多种强化措施，如：第一环槽镶高镍奥氏体环座、第一环槽进行激光淬火，以提高环槽抗磨损能力，燃烧室喉口镶陶瓷复合材料、燃烧室喉口进行激光重熔细化。以提高燃烧室抗裂能力，但铝活塞仍然难以满足欧Ⅳ、欧Ⅴ标准的发动机要求。所以现在很多公司都在选用钢铁材料替代铝合金材料，特别是锻钢活塞材料的开发代表了当前活塞发展的方向，所以铝材质已逐渐不能满足发动机高功率、高强度、低排放的要求。为此国内外活塞设计制造商致力于设计开发既具有高可靠性又能满足经济性及排放要求的新型活塞，如液态模锻陶瓷纤维结构活塞、钢顶铝裙结构的摆体式铰接活塞、铸铁活塞等，以上结构都存在一定的缺点，如液态模锻陶纤维结构铝活塞对毛坯成型工艺要求高，特别是陶瓷纤维结构，必须在高压下才能成型；摆体式铰接结构活塞其活塞头与活塞裙分开加工制造，活塞裙由于壁厚差太大，铸造废品率较高，增加了成本，并且难以形成封闭的油腔，活塞冷却效果较差，同时因为需要更长的活塞销进行连接，总体重量也有所增加，铸铁活塞在制造过程中对环境造成污染，内冷油腔结构难以实现，活塞的重量难以控制。 In the past ten years, engine design and manufacturing technology have been rapidly improved, especially diesel engines are developing towards high power and high load, the degree of strengthening has been continuously improved, and the explosive power has exceeded 20MPa. Although the piston has the advantage of light weight, the aluminum alloy material can only work stably at 350°C. Although various strengthening measures have been taken, such as: the first ring groove is embedded with a high-nickel austenite ring seat, and the first ring groove is laser-treated. Quenching is used to improve the wear resistance of the ring groove. The throat of the combustion chamber is inlaid with ceramic composite materials, and the throat of the combustion chamber is refined by laser remelting. In order to improve the crack resistance of the combustion chamber, the aluminum piston is still difficult to meet the engine requirements of Euro IV and Euro V standards. So now many companies are choosing steel materials to replace aluminum alloy materials, especially the development of forged steel piston materials represents the current direction of piston development, so aluminum materials can no longer meet the requirements of high power, high strength and low emission of engines. For this reason, domestic and foreign piston design manufacturers are committed to the design and development of new pistons with high reliability and meeting the requirements of economy and emission, such as liquid die forging ceramic fiber structure pistons, pendulum hinged pistons with steel top and aluminum skirt structures, cast iron Pistons, etc., the above structures have certain shortcomings, such as liquid forged ceramic fiber structure aluminum pistons have high requirements for blank forming technology, especially ceramic fiber structures, which must be formed under high pressure; the piston head of the pendulum hinge structure piston and the piston The skirt is processed and manufactured separately. Due to the large difference in wall thickness of the piston skirt, the casting rejection rate is high, which increases the cost, and it is difficult to form a closed oil cavity, and the cooling effect of the piston is poor. At the same time, because a longer piston pin is required for connection, the overall The weight has also increased, the cast iron piston pollutes the environment during the manufacturing process, the structure of the inner cooling oil chamber is difficult to realize, and the weight of the piston is difficult to control.
实用新型内容 Utility model content
本实用新型要解决的技术问题，就是针对现有技术所存在的不足，而提供一种结构简单、油耗低的整体锻钢活塞，该活塞可以减少发动机的有害排放，安全可靠。 The technical problem to be solved by the utility model is to provide an integral forged steel piston with simple structure and low fuel consumption, which can reduce harmful emissions of the engine, and is safe and reliable.
本方案是通过如下技术措施来实现的：该整体锻钢活塞包括活塞头部和活塞裙部，活塞头部和活塞裙部之间形成封闭的冷却油腔，冷却油腔通过进、出油孔与外部相通，活塞的环槽全部设在活塞裙部上，所述环槽包括位置在上的两个气环槽和位置在下的一个油环槽，销座设在活塞裙部上，所述销座上端与活塞头部的下端通过过盈配合连接在一起；活塞头部上端外圆部分或全部与活塞裙部火力岸（第一环槽到活塞顶的部分）上端内腔形成过盈配合，在活塞顶面有单面焊缝。 This solution is realized through the following technical measures: the integral forged steel piston includes a piston head and a piston skirt, a closed cooling oil cavity is formed between the piston head and the piston skirt, and the cooling oil cavity passes through the oil inlet and outlet holes It communicates with the outside, and the ring grooves of the piston are all set on the piston skirt, and the ring grooves include two gas ring grooves on the top and an oil ring groove on the bottom, and the pin seat is set on the piston skirt. The upper end of the pin seat and the lower end of the piston head are connected together through interference fit; the outer circle part or all of the upper end of the piston head forms an interference fit with the inner cavity of the upper end of the piston skirt fire land (the part from the first ring groove to the top of the piston) , There is a single-sided weld on the top surface of the piston.
上述活塞头部上端外圆部分或全部与活塞裙部火力岸上端内腔之间过盈配合的过盈量为0.12~0.15 mm。 The interference fit between the outer circle part or all of the upper end of the piston head and the inner cavity at the upper end of the piston skirt is 0.12-0.15 mm.
在油环槽下方设有环形槽，环形槽与油环槽之间形成一环带，环带直径比缸孔直径小1~3mm，环带上设有至少一个连通油环槽与环形槽的回油孔，或者在油环槽下表面上设置水平回油盲孔。通过回油孔使油环槽与环形槽贯通，不仅减轻了重量，增加了裙部柔性，而且有利于油环槽部位的机油回油，特别是油环槽底部的机油，通过回油孔直接回流到环形槽中，或通过油环槽侧面的回油盲孔，经过油环槽下侧面直径较小的环带回流到环形槽中，防止由于机油压力高导致机油上窜，有利于降低机油耗，减少发动机的有害排放。 There is an annular groove under the oil ring groove, and a ring belt is formed between the ring groove and the oil ring groove. The diameter of the ring belt is 1~3mm smaller than the diameter of the cylinder hole. There is at least one connection between the oil ring groove and the ring groove on the ring belt. The oil return hole, or a horizontal oil return blind hole is set on the lower surface of the oil ring groove. Through the oil return hole, the oil ring groove and the annular groove are connected, which not only reduces the weight and increases the flexibility of the skirt, but also facilitates the oil return of the oil ring groove, especially the oil at the bottom of the oil ring groove, directly through the oil return hole. Return to the annular groove, or return to the annular groove through the oil return blind hole on the side of the oil ring groove, and return to the annular groove through the ring belt with a smaller diameter on the lower side of the oil ring groove, so as to prevent the oil from running up due to high oil pressure, which is beneficial to reduce the engine oil. Fuel consumption, reducing harmful emissions from the engine.
上述回油孔与活塞轴线呈15°-25°的夹角。 The oil return hole and the axis of the piston form an included angle of 15°-25°.
上述回油孔与活塞轴线呈20°的夹角。 The oil return hole and the axis of the piston form an included angle of 20°.
上述回油孔设置在靠近活塞短轴的位置。 The above-mentioned oil return hole is arranged near the short axis of the piston.
上述水平回油盲孔设置在靠近活塞长轴的位置，水平回油盲孔的中心线在油环槽下侧面或高于油环槽下侧面，该回油盲孔的轴向方向与活塞中心线垂直。 The above-mentioned horizontal oil return blind hole is set close to the long axis of the piston. The centerline of the horizontal oil return blind hole is on or higher than the lower side of the oil ring groove. The axial direction of the oil return blind hole is in line with the center of the piston. line vertical.
上述环形槽与活塞内腔不通或者在垂直销孔方向相通。 The above-mentioned annular groove does not communicate with the inner chamber of the piston or communicates in the direction perpendicular to the pin hole.
为减少销轴的磨损，在上述销座上设有销孔，在销孔中镶入销孔衬套。 In order to reduce the wear of the pin shaft, a pin hole is provided on the above-mentioned pin seat, and a pin hole bushing is embedded in the pin hole.
上述销孔纵截面为双曲线形，活塞在工作过程中，活塞销因受活塞杆压力作用而向上弯曲，销孔会受到活塞销的作用力，如果销孔为直线形，很容易导致销座疲劳开裂，此方案将销孔设计为双曲线形，可以降低应力集中，有效防止因过高的压力造成 的销孔开裂。 The longitudinal section of the above-mentioned pin hole is hyperbolic. During the working process of the piston, the piston pin is bent upward due to the pressure of the piston rod, and the pin hole will be subjected to the force of the piston pin. If the pin hole is straight, it is easy to cause the pin seat Fatigue cracking, this scheme designs the pin hole as a hyperbola, which can reduce stress concentration and effectively prevent pin hole cracking caused by excessive pressure.
本申请技术方案的有益效果： Beneficial effects of the technical solution of the application:
1、在活塞销座上方和活塞顶面处过盈配合、在顶面过盈配合面进行焊接。焊缝容易清理，在发动机工作过程中不会出现硬质磨粒，减少拉缸的机会。由于活塞在缸体中运动，活塞环对环槽上侧面会有很大的拉力，特别是第一环槽积碳严重时，本实用新型焊接部位在活塞顶面处，环槽与裙部为一个整体，活塞环槽的强度得以提高，从而避免活塞脱顶现象的发生。活塞焊接部位首先采用过盈配合，过盈量在0.12~0.15 mm范围内，在活塞工作过程中随着活塞头部温度的提高，活塞头部与裙部的过盈量会进一步增大，活塞顶面只受压应力，因此，焊接部位在顶面处对焊接的要求不是很高，用普通焊接、氩弧焊、激光焊等就可以完成，降低了成本和能源消耗。双过盈配合+焊接多重措施，对活塞的可靠性提供了多重保护，并提高了活塞的整体性能； 1. Interference fit on the top of the piston pin seat and the top surface of the piston, and weld on the interference fit surface on the top surface. The weld seam is easy to clean, and there will be no hard abrasive particles during the working process of the engine, reducing the chance of cylinder scuffing. Due to the movement of the piston in the cylinder, the piston ring will have a great pulling force on the upper side of the ring groove, especially when the carbon deposit in the first ring groove is serious, the welding part of the utility model is at the top surface of the piston, and the ring groove and the skirt are As a whole, the strength of the piston ring groove is improved, thereby avoiding the occurrence of the phenomenon of piston topping. The welding part of the piston first adopts an interference fit, and the interference is in the range of 0.12~0.15 mm. During the working process of the piston, as the temperature of the piston head increases, the interference between the piston head and the skirt will further increase. The top surface is only subjected to compressive stress. Therefore, the requirements for welding on the top surface of the welding part are not very high. It can be completed by ordinary welding, argon arc welding, laser welding, etc., which reduces the cost and energy consumption. Double interference fit + multiple welding measures provide multiple protections for the reliability of the piston and improve the overall performance of the piston;
2、活塞裙部采用无定位止口设计，可以使活塞裙部壁厚更薄，长轴与缸体的接触面更小，从而使活塞重量更轻量化，以减少活塞往复运动使得惯性力，增加活塞裙部的柔性，活塞与缸孔的配合间隙更小。 2. The piston skirt adopts no positioning spigot design, which can make the wall thickness of the piston skirt thinner, and the contact surface between the long axis and the cylinder body is smaller, so that the weight of the piston is lighter, and the inertial force caused by the reciprocating motion of the piston is reduced. The flexibility of the piston skirt is increased, and the matching clearance between the piston and the cylinder bore is smaller.
附图说明 Description of drawings
图1为本实用新型具体实施方式的正面剖视结构示意图。 Fig. 1 is a front sectional structural schematic diagram of a specific embodiment of the present invention.
图2为本实用新型具体实施方式的侧面剖视结构示意图。 Fig. 2 is a side sectional structural schematic diagram of a specific embodiment of the present invention.
图3为本实用新型具体实施方式的仰视结构示意图。 Fig. 3 is a schematic bottom view of the specific embodiment of the utility model.
图4为本实用新型具体实施方式的立体结构示意图。 Fig. 4 is a schematic diagram of a three-dimensional structure of a specific embodiment of the present invention.
图5为活塞头部的毛坯结构示意图。 Fig. 5 is a schematic diagram of the blank structure of the piston head.
图6为活塞裙部的毛坯结构示意图。 Fig. 6 is a schematic diagram of the blank structure of the piston skirt.
图中：1-活塞头部，2-活塞裙部，3-冷却油腔，4-过盈面，5-焊接面，6-环带，7-进、出油孔，8-过盈面，9-回油孔，10-环形槽，11-气环槽，12-油环槽，13-销座，14-销孔。 In the figure: 1-piston head, 2-piston skirt, 3-cooling oil chamber, 4-interference surface, 5-welding surface, 6-ring belt, 7-inlet and outlet holes, 8-interference surface , 9-oil return hole, 10-ring groove, 11-gas ring groove, 12-oil ring groove, 13-pin seat, 14-pin hole.
具体实施方式 Detailed ways
为能清楚说明本方案的技术特点，下面通过具体实施方式，并结合其附图，对本方案进行阐述。 In order to clearly illustrate the technical characteristics of this solution, the following will describe this solution through specific implementation modes and in conjunction with the accompanying drawings.
一种整体锻钢活塞，如图所示，它包括活塞头部1和活塞裙部2，活塞头部1和活塞裙部2之间形成封闭的冷却油腔3，冷却油腔3通过进、出油孔7与外部相通，活塞的环槽全部设在活塞裙部2上，所述环槽包括位置在上的两个气环槽11和位置在下的一个油环槽12，销座13设在活塞裙部2上，所述销座13上端与活塞头部1的下端通过过盈配合连接在一起；活塞头部1上端外圆部分或全部与活塞裙部2火力岸上端内腔形成过盈配合，在活塞顶面有单面焊缝。活塞头部1上端外圆部分或全部与活塞裙部2火力岸上端内腔之间过盈配合的过盈量为0.12~0.15 mm。 An integral forged steel piston, as shown in the figure, it includes a piston head 1 and a piston skirt 2, a closed cooling oil chamber 3 is formed between the piston head 1 and the piston skirt 2, and the cooling oil chamber 3 passes through the inlet and outlet The oil outlet hole 7 communicates with the outside, and the ring grooves of the piston are all arranged on the piston skirt 2. The ring grooves include two gas ring grooves 11 on the top and an oil ring groove 12 on the bottom. The pin seat 13 is set On the piston skirt 2, the upper end of the pin seat 13 is connected with the lower end of the piston head 1 through interference fit; Close fit, with a single-side weld on the top of the piston. The interference fit between the outer circle part or all of the upper end of the piston head 1 and the inner cavity at the upper end of the piston skirt 2 is 0.12-0.15 mm.
环形槽10与活塞内腔不通或者在垂直销孔14方向相通，在所述销座13上设有销孔14，在销孔14中镶入销孔衬套，销孔14的纵截面为双曲线形。 The annular groove 10 is not connected to the inner cavity of the piston or communicates in the direction of the vertical pin hole 14. A pin hole 14 is provided on the pin seat 13, and a pin hole bushing is inserted in the pin hole 14. The longitudinal section of the pin hole 14 is double curved.
在油环槽12下方设有环形槽10，环形槽10与油环槽12之间形成一环带6，环带6直径比缸孔直径小1~3mm，环带6上设有至少一个连通油环槽12与环形槽10的回油孔9，回油孔9设置在靠近活塞短轴的位置，回油孔9与活塞轴线呈15°-25°的夹角，优选回油孔9与活塞轴线呈20°的夹角；或者在油环槽12下表面上设置水平回油盲孔，水平回油盲孔设置在靠近活塞长轴的位置，水平回油盲孔的中心线在油环槽12下侧面或高于油环槽12下侧面，该回油盲孔的轴向方向与活塞中心线垂直。 An annular groove 10 is provided below the oil ring groove 12, and a ring belt 6 is formed between the ring groove 10 and the oil ring groove 12. The diameter of the ring belt 6 is 1~3mm smaller than the diameter of the cylinder bore. The oil return hole 9 of the oil ring groove 12 and the annular groove 10, the oil return hole 9 is arranged near the short axis of the piston, the oil return hole 9 and the piston axis form an angle of 15°-25°, preferably the oil return hole 9 and The axis of the piston is at an included angle of 20°; or a horizontal oil return blind hole is set on the lower surface of the oil ring groove 12, and the horizontal oil return blind hole is set close to the long axis of the piston, and the center line of the horizontal oil return blind hole is at the center line of the oil ring The lower side of the groove 12 is at or higher than the lower side of the oil ring groove 12, and the axial direction of the oil return blind hole is perpendicular to the center line of the piston.
本实用新型中未经描述的技术特征可以通过或采用现有技术实现，在此不再赘述，当然，上述说明并非是对本实用新型的限制，本实用新型也并不仅限于上述实施方式，本领域的普通技术人员在本实用新型的实质范围内所做出的变化、改型、添加或替换，也应属于本实用新型的保护范围。 The technical features not described in the utility model can be realized by or adopting the prior art, and will not be repeated here. Of course, the above description is not a limitation of the utility model, and the utility model is not limited to the above-mentioned embodiment. Changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the present utility model shall also belong to the protection scope of the present utility model.
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| CN201520066592.7U CN204419382U (en) | 2015-01-30 | 2015-01-30 | A kind of overall forging steel piston |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156222A (en) * | 2015-08-17 | 2015-12-16 | 滨州东海龙活塞有限公司 | Double-weld-joint welding type integrated forged steel piston |
| CN106285999A (en) * | 2016-08-09 | 2017-01-04 | 山东滨州渤海活塞股份有限公司 | Monoblock type internal combustion engine steel pistons, internal combustion engine, the vehicles and manufacture method |
| CN107921524A (en) * | 2015-08-26 | 2018-04-17 | 马勒国际有限公司 | Method for manufacturing piston |
| CN109595092A (en) * | 2018-12-27 | 2019-04-09 | 滨州东海龙活塞有限公司 | A kind of method for supporting of piston and piston ring groove |
-
2015
- 2015-01-30 CN CN201520066592.7U patent/CN204419382U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156222A (en) * | 2015-08-17 | 2015-12-16 | 滨州东海龙活塞有限公司 | Double-weld-joint welding type integrated forged steel piston |
| CN107921524A (en) * | 2015-08-26 | 2018-04-17 | 马勒国际有限公司 | Method for manufacturing piston |
| CN106285999A (en) * | 2016-08-09 | 2017-01-04 | 山东滨州渤海活塞股份有限公司 | Monoblock type internal combustion engine steel pistons, internal combustion engine, the vehicles and manufacture method |
| CN109595092A (en) * | 2018-12-27 | 2019-04-09 | 滨州东海龙活塞有限公司 | A kind of method for supporting of piston and piston ring groove |
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