36 results about "Steel piston" patented technology

The utility model discloses a steel piston which is characterized in that an inclined oil hole platform is arranged at the bottom of an inner cavity of an inner cavity surface of a steel piston main body and protrudes out of the surface of the inner cavity surface, and an inclined oil hole communicated with a lubricating oil channel is formed in the inclined oil hole platform; cooling lubricating oil stored in the cooling oil cavity enters the contact faces of the connecting rod, the piston pin and the piston pin hole sequentially through the lubricating oil channel, the inclined oil hole and the oil hole in the connecting rod small end, the protruding inclined oil hole platform structure is easier to forge and form compared with a small pit structure, the blank manufacturing difficulty is lowered, and the machining efficiency is improved. The protruding inclined oil hole platform structure can better guide cooling lubricating oil in the cooling oil cavity to flow into the connecting rod and the piston pin, lubrication is provided for contact between the piston pin hole and the connecting rod and the piston pin, and the occlusion risk is effectively reduced. The lightweight design and the machining quality are both considered, and meanwhile the failure risk of the piston in an engine is reduced.

The invention discloses a welded all-steel piston and a manufacturing method thereof.The manufacturing method of the welded all-steel piston comprises the following operation steps that S1, a piston head and a piston skirt are preprocessed; s2, friction welding is conducted, specifically, the preprocessed piston head and the piston skirt are connected into a whole in a friction welding mode, and a closed inner cooling oil cavity is formed in the piston head and the piston skirt; s3, vacuum tempering is conducted; s4, the inner cooling oil cavity is filled with a removable sealing medium, specifically, the inner cooling oil cavity is filled with a removable solid sealing medium, and the whole inner cooling oil cavity and the oil hole are filled and sealed with the solid sealing medium; s5, finish machining is conducted, specifically, the piston body filled with the solid sealing medium is subjected to finish machining; and S6, the sealing medium is removed, specifically, the piston body subjected to finish machining is heated, so that the solid sealing medium is melted or softened, and the solid sealing medium is discharged out of the inner cooling oil cavity. According to the welded all-steel piston and the manufacturing method thereof, the cleanliness of the inner cooling oil cavity can be effectively improved, and the technological process is simplified.

The utility model provides a novel ultrahigh-pressure supercharger structure which is composed of an ultrahigh-pressure supercharger oil cylinder, a high-pressure cylinder connecting barrel, a high-pressure cylinder and the like. According to the working principle, the motor drives the oil pump, oil pushes the large piston, the large piston drives the small piston, and low-pressure media are converted into high-pressure media. Continuous pressure output is achieved through reciprocating motion of the piston, and the high-pressure one-way valve controls one-way flowing of media to ensure stable pressure. The supercharger can automatically reciprocate, so that the operation efficiency of the system is improved. The key parts are made of excellent materials, the high-pressure cylinder is made of high-strength alloy steel, the piston rod is made of high-strength alloy materials, and the sealing piece is pressure-resistant and wear-resistant. Meanwhile, an intelligent control system is arranged, working parameters can be adjusted, and a cooling and safety system is arranged to guarantee normal operation and operation safety of equipment. The wear condition of key parts needs to be checked regularly in daily life, oil quality in the oil cylinder is managed, the service life of equipment is prolonged, and stable performance is guaranteed.

The invention discloses a preparation process of a light-weight high-strength fine-grain steel piston, and belongs to the technical field of preparation of light-weight high-strength materials. According to the high-strength light-weight steel piston, 38MnVS6 steel is adopted as a finished product material, and the preparation method comprises the steps of sample upsetting and blank finish forging; carrying out friction welding treatment; performing multi-stage rapid heating and cooling heat treatment; and a tempering treatment process. The steel comprises the following chemical components in percentage by weight: 0.3 to 0.45 percent of C, 1.4 to 1.6 percent of Mn, 0.18 to 0.26 percent of Si, 0.01 to 0.015 percent of P, 0.04 to 0.05 percent of S, 0.12 to 0.2 percent of Cr, 0.08 to 0.1 percent of Cu, 0.018 to 0.026 percent of Al, 0.06 to 0.09 percent of V, 0.02 to 0.04 percent of La, 0.03 to 0.05 percent of Ce, 0.01 to 0.02 percent of Y and the balance of Fe. And finally, the lightweight piston with high tensile strength, yield strength, fatigue strength and the like is prepared, a workpiece of the lightweight piston can be used for a high-performance diesel engine or a ship engine, and the lightweight piston has a good industrial application prospect.

The invention discloses an engine high-strengthening steel piston lubricating structure which comprises a piston main cooling structure, and the piston main cooling structure comprises a main cooling cavity, an oil inlet channel and an oil return channel. The main cooling cavity is arranged in the top of a piston, close to a piston ring groove and of an annular cavity structure, and the upper portion of the main cooling cavity is connected with the top of the piston and a combustion chamber and used for absorbing heat transmitted by the wall face of the combustion chamber. The oil inlet channel is parallel to the outer circle of the piston, the upper portion of the oil inlet channel is communicated with the main cooling cavity, the lower portion of the oil inlet channel is communicated with the piston cooling nozzle, and the oil inlet channel is used for guiding external pressure lubricating oil into the main cooling cavity to cool the piston. Under the condition of splash lubrication of the engine, forced lubrication between the piston and the cylinder sleeve, between the piston ring and the cylinder sleeve and between the piston and the piston pin is increased, that is, lubricating oil entering the friction pair has certain pressure, an oil film can be established between the friction pair more quickly, and a better lubrication effect is achieved.

The invention relates to the field of steel piston phosphating treatment, in particular to a steel piston phosphating treatment method and system. According to the steel piston phosphating treatment method provided by the invention, through forced liquid drainage and synchronous purification, no liquid accumulation in a complex inner cavity is ensured, the defects of cross contamination and piebaldness are avoided, and the core pain point of steel piston phosphating is fundamentally solved; through the combined action of forced liquid drainage and synchronous purification, the thickness difference of phosphating films on the inner cavity and the outer surface of the piston subjected to phosphating treatment is smaller than 1 micron, corrosion resistance is uniform, and the product quality consistency is improved.

The utility model relates to the technical field of metal forging, and discloses a combined type cooling forming tool of a forged steel piston blank, which comprises a forging die, a plurality of cooling cavities are arranged in the forging die, and water supply mechanisms for injecting cold water into the cooling cavities are arranged on two sides of the forging die. A concentrated water return mechanism for converging cooling water is arranged at the bottom end of the forging die, a die cavity is formed in the middle of the top end of the forging die, and a cooling fan for air cooling of the top end of the piston blank is arranged at the top end of the die cavity; the water supply mechanisms are arranged on the two sides of the forging die, cooling water can be input into the cooling cavity in a staggered mode from different directions, the piston blank cooling uniformity is improved, the phenomenon that due to insufficient cooling of the flowing tail end, the piston blank shrinks and deforms is avoided, and the piston machining quality is improved; and the output cooling water can be converged through the centralized water return mechanism.

This invention relates to the field of seismic isolation bearing technology, specifically a horizontal seismic isolation bearing based on air springs, comprising a lower connecting steel plate, an upper connecting steel plate, a lead-core rubber bearing element, a supporting sliding element, a sector-shaped air spring, and a dust cover. The lead-core rubber bearing element is fixedly connected to the upper part of the supporting sliding element, and the supporting sliding element and the lower connecting steel plate are connected through sliding contact, forming a sliding friction pair. Multiple sector-shaped air springs are arranged circumferentially around the supporting sliding element, and the outer sides of the sector-shaped air springs are connected to steel limiting rings fixed to the lower connecting steel plate. The sector-shaped air springs are internally equipped with limiting devices and buffer rubber to prevent excessive displacement and compression damage. A dust cover is installed on the upper part of the steel piston rod of the sector-shaped air spring. The bearing of this invention can automatically adjust its working state according to the earthquake intensity, primarily using sliding and air springs during minor earthquakes, and activating the lead-core rubber for energy dissipation during major earthquakes, achieving intelligent graded seismic isolation.

The invention discloses a piston top detection clamp which comprises a base, a support, a main body, an end face positioning ring, a clamping assembly, an angle positioning assembly and a pneumatic control assembly. The steel piston top is positioned through a spigot formed by combining the outer circle, the top face, the main body and the end face positioning ring, the angular freedom degree is limited through the angle positioning assembly, then pneumatic three-point clamping is conducted through the clamping assembly, and therefore rapid and stable clamping is achieved. The device can ensure that the repeated positioning precision is less than 0.01, has the advantages of high detection efficiency, high positioning precision, compact structure, reliable decompression protection and the like, and is suitable for large-scale detection of the steel piston tops of the engines of the unmanned aerial vehicles.

The invention discloses a steel piston ring groove stepped wear-resistant coating based on laser additive manufacturing and a preparation method of the steel piston ring groove stepped wear-resistant coating, and belongs to the technical field of material science and laser additive manufacturing. The wear-resistant coating is obtained by coating Fe-based soft transition powder and Fe-based hard wear-resistant powder, and the Fe-based soft transition powder comprises the following components in percentage by weight: 21 to 23 percent of Cr, 4 to 5 percent of Si, 1.5 to 2.5 percent of Mo, 12 to 14 percent of Ni, 0.1 to 0.2 percent of C, 1.4 to 1.8 percent of B and the balance of Fe; the Fe-based hard wear-resistant powder is prepared from the following components: 31 to 33 weight percent of Cr, 3.6 to 4 weight percent of Si, 1.8 to 2.1 weight percent of Ni, 3.8 to 4 weight percent of C, 1.8 to 2 weight percent of Cu, 0.3 to 0.5 weight percent of CNT, 0.3 to 0.5 weight percent of BNNT and the balance of Fe. The wear-resistant coating has a stepped structure of the soft transition layer and the hard working layer, so that the internal stress of the coating is reduced, and the bonding strength of the coating is improved; meanwhile, the high-heat-conduction phase is added and matched with the SiC hard particles, so that the performance of a high-fatigue area of the steel piston ring groove can be greatly improved, and the service life of the steel piston is prolonged.

The utility model relates to the technical field of piston welding machining, in particular to an auxiliary tool matched with piston welding machining and a piston welding device.The auxiliary tool comprises an air inlet pipeline, an air outlet pipeline and a slag collecting box; one end of the air inlet pipeline is connected with the cooling cavity inflow connector, the other end of the air inlet pipeline is connected with an external air source, and an air inlet valve for controlling air to enter is arranged in the air inlet pipeline; one end of the air outlet pipeline is connected with the cooling cavity outflow connector, and the other end of the air outlet pipeline serves as an air outlet. And a connected slag collecting box is arranged at the middle end of the gas outlet pipeline. The tool can help to solve the problems that welding slag is splashed in a cooling cavity in the electron beam welding process of an all-steel piston and the surface of an oil cavity on the side is ablated by a welding seam, airflow circulation is formed in the oil cavity of the all-steel piston, electron beams in the welding process are diluted through gas, the energy density of the electron beams is reduced, and ablation to the surface of the oil cavity is reduced; and meanwhile, the welding slag is rapidly cooled in the airflow and collected into the slag collecting box, and the problem of welding slag removal is effectively solved.

The utility model discloses a split press-fitting type aluminum piston, and belongs to the technical field of automobile braking. The piston comprises a steel piston head and an aluminum piston body, an installation hole is formed in the piston body, one end of the piston head is installed in the installation hole through interference fit of an outer spline and an inner spline, and an open groove is formed in the other end of the piston head to limit displacement of a brake shoe. Six petal structures evenly distributed circumferentially are designed at the end, away from the piston head, of the piston body, and flowing of brake fluid is facilitated. The steel piston head is used for bearing high load, the aluminum body reduces abrasion of a cylinder hole and achieves light weight, and spline connection ensures bonding strength. Compared with a traditional piston, the piston is light in weight, long in service life, high in braking efficiency and suitable for a modern automobile braking system.

The utility model provides an automatic alignment double-station multi-angle drilling and boring clamp for steel pistons. The automatic alignment double-station multi-angle drilling and boring clamp comprises a turnover workbench, two three-jaw chucks, a plurality of positioning pins, two pistons, a positioning core rod, a positioning block and a positioning screw. The two three-jaw chucks are symmetrically installed on the surface of the overturning workbench. The two pistons are respectively arranged above the two three-jaw chucks, and the plurality of positioning pins are respectively arranged between the two three-jaw chucks and the two pistons; the positioning core rod is connected into the piston in a pluggable mode. The positioning block is mounted on the surface of the three-jaw chuck; and the positioning screw is mounted on the positioning block. According to the steel piston automatic alignment double-station multi-angle hole drilling and boring clamp, machining position degree deviation caused by manual clamping is effectively avoided, the position accuracy of steel piston machining is greatly improved, the requirement of equipment such as an engine for high precision of the steel piston can be better met, and the production efficiency is improved. And the product quality of the steel piston is improved.

The application provides a steel piston and a manufacturing process, and relates to the technical field of internal combustion engine pistons.The application avoids the weld from the high-load area such as the top surface and the combustion chamber of the piston, reduces the influence of the welding defects in the weld on the piston, greatly prolongs the service life of the piston, and improves the reliability and safety of the piston operation;the laser beam welding process or the electron beam welding process is used to weld the weld, the weld is small, the surface is well formed, the weld quality is excellent, the flash of the weld does not exist in the cooling channel, the cooling oil can smoothly reach the top of the cooling channel, and the piston head is beneficial to cooling; the horizontal and vertical staggered arrangement of the weld can bear the external force received by the skirt, the connecting strength of the inner piston body and the outer piston body is higher, and the service life of the piston is prolonged; the piston head and the pin seat of the inner piston body are an integrated structure penetrating from top to bottom, the probability of fatigue fracture between the pin seat and the piston head is reduced in the long-time use of the piston, and the service life of the piston is prolonged.

A hot forging steel piston skirt trimming-punching-finishing three-in-one device and processing method for inhibiting hot deformation belong to the technical field of mechanical processing, and are directed to trimming punching production process control of hot forging steel piston skirt forgings with flash or needing punching or both. The four process controls of holding, trimming, punching and finishing of the hot forging steel piston skirt are realized through mutual cooperation of three high-temperature-resistant die springs, and the precision of the piston skirt is greatly improved. The trimming device is simple in structure and safe, can be classified according to different specifications of different cylinder diameter piston skirts, and can meet the high-precision trimming requirements of all hot forging steel piston skirts. The present application innovatively proposes the technical scheme of "three sets of customized rectangular springs cooperative control + synchronous composite process", and for the first time realizes "one clamping and three processes completed simultaneously" of the hot forging steel piston skirt, solves the hot deformation and efficiency bottleneck from the aspects of process principle and structure design, and has remarkable creativity and practicality.

To provide a method of lubricating a heavy-duty Diesel engine comprising steel pistons, and a crank-case lubricant composition achieving excellent piston cleanliness.SOLUTION: A method of lubricating a heavy duty Diesel engine includes lubricating steel pistons with a lubricant composition, which lubricant composition includes, (i) a detergent system consisting of one or more alkali earth metal sulfonate detergents delivering about 0.3 to about 1 wt.% of sulfonate soap to the lubricant composition, and (ii) a dispersant system including one or more polyisobutylene succinimide dispersants delivering at least about 5 wt.% of one or more dispersants to the lubricant composition, with one or more polyisobutylene succinimide dispersants having a number averaged molecular weight of from about 1200 to about 2500 and derived from a highly reactive polyisobutylene delivering more than 650 ppm of nitrogen to the lubricant composition.SELECTED DRAWING: None

The application discloses a high-adaptability air track moving-frame legless advanced support, which comprises a top beam, the top beam comprises two or more cross beams, a plurality of longitudinal beams are overlapped on the cross beams, piston round steels are arranged at the two ends of the cross beams respectively, and the piston round steels are connected with jacks arranged in the cross beam bodies. The support supporting force is not dependent on the support column support, the advanced support air moving frame is realized, the current advanced support occupies large ground space, and the deficiencies of the moving frame mode are solved, and the demand of the modern mine working face advanced support is met.

The steel piston comprises a piston body with a combustion chamber at the top and an inner cavity in the piston body, the piston body is composed of a first piston assembly and a second piston assembly, and the first piston assembly and the second piston assembly are fixedly connected through a first connecting position and a second connecting position. A closed cooling oil channel is formed inside the cooling oil channel; the first joint is arranged in a radial wall thickness area between the inner side surface of the cooling oil duct and the inner cavity of the piston; or is arranged in a wall thickness area between the surface of the combustion chamber and the inner side surface of the cooling oil duct and forms an included angle of 40-50 degrees with the axis of the piston main body; or the axial wall thickness area is arranged between the top surface of the piston and the cooling oil duct; the second joint is arranged in a radial wall thickness area between the outer side face of the cooling oil channel and the outer circle face of the piston body. By reasonably arranging the positions of the welding seams, the top face of the piston and the high-load area of the combustion chamber are avoided, the influence of welding flash or welding defects on cooling oil flowing is reduced, and the cooling efficiency is improved.

The utility model relates to a kind of steel piston can be assembled central cooling oil cavity structure, belong to piston technical field.Structure includes steel piston main body and cover plate, cover plate is arranged in the inner cavity of the lower part of combustion chamber of steel piston main body, cover plate and the bottom area of combustion chamber form central cooling oil cavity, the oil in central cooling oil cavity is used to the bottom area of combustion chamber is forcedly cooled, the temperature of the bottom area of combustion chamber is reduced to below 280 DEG C, effectively prevent the coking, carbonization phenomenon of oil occurs, solve the problem of oil premature aging deterioration due to the coking, carbonization of oil in the bottom area of combustion chamber.

The invention discloses a lightweight cast iron piston, and relates to the technical field of pistons. The cooling oil cavity is formed in the piston body and close to the top position, and the cooling oil cavity is communicated with two oil holes formed in the bottom of the piston body. According to the light-weight cast iron piston, the cast iron material with the density lower than that of steel is selected and matched with the multi-position de-weight holes, weight reduction can be achieved from the two dimensions of the material and the structure, the weight of the piston is remarkably reduced compared with that of a steel piston of the same model, reciprocating inertia force is reduced accordingly, the load of an engine bearing is greatly reduced, and the service life of the bearing is effectively prolonged; meanwhile, the machining precision of the de-weighting hole is strictly controlled by means of a three-coordinate measuring instrument in the detection process, local stress concentration caused by a de-weighting structure is avoided, the stress peak value of the key part of the piston is controlled within the reasonable range of cast iron yield strength, and it is ensured that the structure reliability is not sacrificed; and the high-load requirements of high-power internal combustion engines such as commercial vehicles and engineering machinery are met.

The application discloses a manufacturing method of a stainless steel integral inner liquid inlet piston rod of a hydraulic support oil cylinder, and solves the problems of poor corrosion resistance of a traditional integral inner liquid inlet piston rod of a hydraulic support, high machining precision of a stainless steel deep hole, and welding-free hole plugging by improving a stainless steel piston rod machining process flow and adopting a process of fixed size, induction heating, local upsetting, quenching and tempering treatment, rough turning, fine turning, surface quenching, deep hole drilling, through hole drilling, joint hole milling, sealing hole plugging, grinding and polishing. The method shortens a machining process, simplifies a machining process, and is free of welding under the premise of guaranteeing mechanical properties and corrosion resistance of the piston rod, has important significance for improving production efficiency and corrosion resistance of the hydraulic oil cylinder piston rod, prolonging service life of the hydraulic support, and realizing efficient operation of coal fully-mechanized mining equipment in a mine.

The invention discloses a machining method for a steel piston. The machining method comprises the following operation steps that S1, an oil outlet channel is machined, and surface cleaning is conducted; s2, brushing a slag stopping coating; s3, assembling is carried out; s4, demagnetizing and preheating; s5, electron beam welding; s6, sand blasting; and S7, finish machining is conducted to the finished product size after heat treatment. According to the machining method of the steel piston, the interior of the inner cooling oil cavity can be kept clean, and the risk of abnormal faults of an engine caused by falling of foreign matter in the inner cooling oil cavity is avoided.

The invention discloses a drilling mistake-proofing clamp device for an eccentric pin hole piston skirt and a mistake-proofing method of the drilling mistake-proofing clamp device, is suitable for accurately controlling the position degree of a pin hole and the drilling direction in the machining process of a steel piston forge piece, and belongs to the technical field of machining. The device comprises a clamp body, a proximity switch detection assembly and a machine tool control system. The proximity switch is arranged on the clamp to detect the placing direction of a workpiece in real time and is in linkage with a machine tool control system to achieve automatic control over the drilling action, the placing direction of the part is automatically recognized, and the problem that the drilling position degree and direction are abnormal is completely eradicated. When the workpiece is placed reversely or obliquely, machining is forcibly interrupted, and an alarm is given. The defect that a traditional clamp depends on manual mistake proofing is overcome, the pin hole position accuracy and the production efficiency are remarkably improved, and the clamp is suitable for automatic machining scenes of piston skirts of complex structures and has the advantages of being efficient, accurate, high in mistake proofing capacity and the like.

This invention discloses a perforated turbulence-type internal cooling oil cavity structure and a steel piston for a high-strength diesel engine. It utilizes a perforated plate-type turbulence-type crown internal cooling oil cavity (3) with circumferentially arranged perforated plate-type turbulence-type components (4) on its outer wall. Flow holes (5) are uniformly opened on the perforated plate-type turbulence-type components (4). The perforated plate-type turbulence-type components (4), in conjunction with the flow holes (5), organize the oscillating oil flow, enhancing near-wall heat transfer and suppressing stagnant dead zones. Simultaneously, the flow holes (5) reduce weight, achieving a combination of improved heat transfer and lightweight design. The included angle of the perforated plate-type turbulence-type components (4) is 90°–150°, and it is at the same height as the first annular groove, directionally scouring the top surface and inner high-heat wall surface of the oil cavity. The minimum wall thickness between the oil cavity and the top, inner cavity, and inner annular surface of the first annular groove is ≥1.5 mm, ensuring strength and fatigue life. The structure can be manufactured by split forging, and the assembly of the turbulence components and the encapsulation of the internal cooling oil cavity are achieved through two laser welding processes. This significantly improves the heat transfer area and heat transfer coefficient, reduces the peak temperature and thermal stress, and achieves weight reduction.

The application discloses a steel piston inner cooling oil cavity collaborative design method based on oscillatory flow heat transfer simulation and multi-objective optimization, which is suitable for parameterized optimization design of high-performance diesel engine steel piston inner cooling structure. The method establishes a steel piston and inner cooling oil cavity parameterized model, determines design variables and constraints, generates samples by using optimal Latin hypercube sampling and automatically models, carries out oscillatory flow-heat transient CFD calculation wall heat exchange coefficient distribution, maps the steel piston heat transfer boundary to solve a temperature field, and further obtains thermal stress, thermal deformation and thermal-mechanical coupling response, combines visualization and bench test to check and correct the model, constructs a 'parameter-quality or thermal stress' surrogate model based on sample data by using GA-LSSVM, solves a Pareto solution by using MOPSO and selects a scheme, and then carries out thermal-mechanical coupling and FEMFAT fatigue checking, feeds back constraint iterative optimization, determines optimal oil cavity parameters, and significantly improves the service reliability of the steel piston inner cooling oil cavity under high heat load working conditions.

A steel piston (10) for an internal combustion engine includes a cooling cavity (20) extending in a rotationally symmetrical manner about the piston axis and at least three annular grooves (12, 14, 16), wherein the third annular groove (16), as viewed from the piston crown (18), has a greater depth (T3) than the depth (T2) of a second annular groove (14).

The utility model relates to the technical field of subway tunnel construction, in particular to a vibration damping device of a shield tunnel, and aims to solve the problem of vibration damage of shock waves generated by blasting to a main line shield tunnel during subway connection channel drilling and blasting method construction. Comprising a supporting base used for abutting against a shield segment and a vibration reduction piston device with one end connected with the supporting base. The damping piston device comprises a sleeve, a piston column and an elastic assembly. The first end of the sleeve is provided with a containing groove. The second end of the sleeve is used for connecting supporting steel. The first end of the piston column is slidably arranged in the containing groove. The elastic assembly is arranged between the first end of the piston column and the bottom of the containing groove. According to the utility model, the impact force generated by blasting excavation of the connection channel is weakened, the shield tunnel is protected from being directly damaged by blasting impact, the service life of the duct piece is prolonged, and the maintenance cost is reduced.

1. Name of the product in this design: Stainless steel piston (one-piece perforated heat dissipation). 2. Purpose of this design: For use in pistons for internal combustion engines. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The invention discloses a hot forging steel piston skirt trimming-punching-finishing three-in-one device capable of restraining thermal deformation and a machining method, belongs to the technical field of machining, and aims at control over the punching production process of hot forging steel piston skirt forgings with flashes or needing punching or with both flashes and punching. Through mutual cooperation of the three high-temperature-resistant die springs, control over the four processes of tight holding, edge cutting, punching and finishing of the hot forging steel piston skirt is achieved, and the precision of the piston skirt is greatly improved. The punching device is simple in structure and safe, piston skirts with different cylinder diameters can be classified according to different specifications, and the high-precision punching requirement of all hot forging steel piston skirts is met. The technical scheme of three sets of customized rectangular spring cooperative control and synchronous composite technology is innovatively provided, one-time clamping and three-procedure synchronous completion of the hot forged steel piston skirt are achieved for the first time, the hot state deformation and efficiency bottleneck are solved from the technological principle and structural design level, and remarkable creativity and practicability are achieved.

This application discloses an all-steel piston, including a piston body, a piston pin bore, and an internal oil cavity. The inner wall of the piston pin bore is provided with two symmetrically distributed crescent-shaped structures and two groove structures; the groove structures communicate with the crescent-shaped structures. The piston body has at least two through holes, which connect the internal oil cavity with the inner cavity of the piston body, and the through holes are symmetrically arranged in the inner cavity of the piston body. By providing a combination structure of through holes, crescents, and grooves in the existing piston structure, the cooling lubricating oil in the oil cavity can be better guided to flow into the connecting rod and piston pin, providing lubrication for the contact between the piston pin bore and the connecting rod and piston pin, effectively reducing the risk of seizure. This solution takes into account both lightweight design and manufacturing quality, while reducing the risk of piston failure in the engine.