CN113550375B - Hydraulic breaking hammer middle cylinder and manufacturing method thereof - Google Patents
Hydraulic breaking hammer middle cylinder and manufacturing method thereof Download PDFInfo
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- CN113550375B CN113550375B CN202110887173.XA CN202110887173A CN113550375B CN 113550375 B CN113550375 B CN 113550375B CN 202110887173 A CN202110887173 A CN 202110887173A CN 113550375 B CN113550375 B CN 113550375B
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- cylinder body
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- middle cylinder
- soft film
- cavity
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J17/00—Forge furnaces
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/30—Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Actuator (AREA)
Abstract
The invention relates to the technical field of hydraulic breaking hammers, in particular to a method for manufacturing a cylinder body in a hydraulic breaking hammer, wherein the middle cylinder body comprises a middle cylinder body, a piston cavity is longitudinally arranged on the middle cylinder body, and an energy accumulator cavity and a control valve signal channel which are communicated with the piston cavity are also arranged on the cylinder body; wherein, the inner wall of the piston cavity is uniformly distributed with a reticulate pattern structure, and the reticulate pattern structure is uniformly distributed in the whole inner cavity; the outer layer of the mesh-shaped structure is coated with a soft film, and the soft film covers the inner wall of the piston cavity. The original signal groove is cancelled, the demand of the signal groove on hydraulic oil is reduced, the structural strength of the middle cylinder body is enhanced, and the function of preventing internal leakage is achieved; the soft film has certain resilience capability, and hard friction and strain can be prevented; the reticulate pattern structure enables the soft membrane to be stronger in adhesiveness, meanwhile, the soft membrane has the timeliness of adsorbing hydraulic oil and increasing the oil film to stay on the inner wall of the cylinder body, and the oil film is a main factor for supporting the piston in an inner cavity vacuum environment, so that the occurrence probability of cylinder pulling is effectively prevented.
Description
Technical Field
The invention relates to the technical field of hydraulic breaking hammers, in particular to a middle cylinder body of a hydraulic breaking hammer and a manufacturing method thereof.
Background
The hydraulic breaking hammer is mainly mounted on a hydraulic excavator or a loader, converts hydraulic energy into mechanical impact energy, drives a piston to reciprocate by means of hydraulic pressure, drives a drill rod to realize a breaking function, has the characteristics of high operation efficiency, low energy consumption, small noise compared with the traditional blasting, wide adaptability to complex breaking, breaking and dismantling operation environment and the like, and is widely applied to the fields of mining, building construction, metallurgical industry, highways and railways, municipal engineering and the like.
Along with the expansion of the model of the breaking hammer, the processing and production difficulty and the product failure rate are obviously improved, the failure is mainly and intensively reflected in the cylinder pulling phenomenon, the cylinder pulling phenomenon refers to that the surface of a piston is pulled to form a pit or a groove due to the collision and friction of the piston and a middle cylinder body, hydraulic oil is leaked, and the breaking hammer cannot normally work;
in the related technology, in order to reduce the cylinder pulling phenomenon, an annular lubricating groove is added in the middle cylinder body to avoid poor lubrication, or an energy storage device is arranged in the middle cylinder body to reduce the pressure in the middle cylinder body, so that the cylinder pulling is reduced; however, the arrangement mode sacrifices the structural strength of the cylinder body or reduces the impact force, and the original performance of the hydraulic breaking hammer cannot be maintained.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the cylinder body in the hydraulic breaking hammer and the manufacturing method thereof are provided, and the cylinder pulling rate of the cylinder body is reduced on the premise of not reducing the performance of the hydraulic breaking hammer.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, the invention provides a middle cylinder body of a hydraulic breaking hammer, which comprises a middle cylinder body, wherein a piston cavity penetrates through the middle cylinder body along the length direction of the middle cylinder body, and an energy storage cavity communicated with the piston cavity and a control valve signal channel communicated with the piston cavity are also arranged on the cylinder body;
the inner wall of the piston cavity is uniformly provided with a reticulate pattern structure, the piston cavity is internally provided with the reticulate pattern structure, and the reticulate pattern structure is uniformly distributed in the whole inner cavity of the piston cavity; the outer layer of the mesh-shaped structure is further coated with a soft film, and the soft film covers the inner wall of the piston cavity.
Further, the surface of the soft membrane has micropores.
Furthermore, the soft film is made of graphite.
Furthermore, the inner end of the control valve signal channel is directly communicated with the piston cavity, and an original signal ring groove is omitted.
Further, a spherical groove facing the control valve signal channel is formed at the position where the inner end of the control valve signal channel is communicated with the piston cavity.
Further, a branch signal passage is included in communication with the control valve signal passage.
In a second aspect, the invention further provides a method for manufacturing the cylinder body in the hydraulic breaking hammer, which comprises the following steps:
forging and processing the middle cylinder body, and carrying out flaw detection on the middle cylinder body;
carrying out boring and normalizing processes on the centering cylinder body, and carrying out secondary flaw detection;
processing an energy storage cavity, a control valve signal channel and a reversing valve cavity;
polishing and deburring the centering cylinder body, and performing heat treatment;
forming a reticulate pattern structure on the piston cavity after the heat treatment through laser treatment;
cleaning and polishing the cylinder body after the reticulate pattern structure is formed;
performing film coating treatment on the soft film in the piston cavity;
and (4) carrying out ultrasonic treatment and antirust treatment on the centering cylinder body to finish the processing.
Further, after the reticulate pattern structure is formed on the middle cylinder body, the piston cavity is ground by using an internal grinding machine, so that the reticulate pattern depth is 0.015mm +/-0.01 mm.
Further, when the soft film coating treatment is carried out on the inner part of the piston cavity, graphite powder is extruded and attached to the inner wall of the piston cavity, then the graphite powder curing layer is fixed on the inner wall of the piston cavity through a sintering process to form a soft film, and micropores are formed on the soft film through thermal sintering.
Further, when the interior of the piston cavity is subjected to soft film coating treatment, incomplete spraying is carried out on the inner wall of the piston cavity in an electrostatic spraying mode, heating and curing are carried out, so that gaps are formed on the surface of the cured soft film, and then the electrostatic spraying is carried out for a plurality of times, so that the thickness of the soft film reaches 1.8-2.0 mm.
The beneficial effects of the invention are as follows: the invention firstly cancels the original signal groove which is in signal communication with the control valve, reduces the demand of the signal groove on hydraulic oil, strengthens the structural strength of the middle cylinder body and plays a role in preventing internal leakage; the soft film has certain resilience capability, and hard friction and strain can be prevented; the reticulate pattern structure makes the bonding property of the soft film stronger, and meanwhile, the soft film has the timeliness of adsorbing hydraulic oil and increasing the oil film to stay on the inner wall of the cylinder body due to the material property of the soft film, so that the lubricating effect is improved. Because the oil film is the main factor for supporting the piston in the vacuum environment of the inner cavity, the occurrence probability of cylinder pulling is effectively prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a middle cylinder block according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a cylinder in the hydraulic breaking hammer according to the embodiment of the invention;
FIG. 3 is a sectional view taken along line A-A of FIG. 2 in accordance with an embodiment of the present invention;
fig. 4 is a flowchart of a method for manufacturing a cylinder in a hydraulic breaking hammer according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
The cylinder body in the hydraulic breaking hammer as shown in fig. 2 to 3 comprises a cylinder body 10, wherein a piston cavity 20 is arranged on the cylinder body 10 in a penetrating manner along the length direction of the cylinder body, and an energy storage cavity 30 communicated with the piston cavity 20 and a control valve signal channel 40 communicated with the piston cavity 20 are further arranged on the cylinder body; it should be noted here that the middle cylinder body 10 is further provided with an oil inlet channel and an oil return channel which are communicated with the energy storage cavity 30, and since the oil inlet channel and the oil return channel are the same as those in the prior art, they are not described herein again, and only the improvement points are described in detail in the embodiment of the present invention;
as shown in fig. 3, the piston cavity 20 has a mesh structure 21 therein, the mesh structure 21 is uniformly distributed in the whole inner cavity of the piston cavity 20, and the mesh structure is a strip protruding along the radial direction of the inner wall of the piston cavity 20 or a groove recessed along the radial direction of the inner wall of the piston cavity 20; in the embodiment of the present invention, the mesh-like structure is formed by laser heat treatment, as shown in fig. 3, each line in the mesh-like structure 21 is inclined from the axial direction of the piston cavity 20, and the mesh-like structure 21 can improve the adhesion between the flexible film 22 and the piston cavity 20, and can also make hydraulic oil stay between the mesh-like structure 21, thereby improving the adhesion time of the oil film;
another inventive point of the present invention is that the outer layer of the mesh-like structure on the inner wall of the piston cavity 20 is further coated with a soft film 22, and the soft film 22 is disposed to cover the inner wall of the piston cavity 20. It should be pointed out here that, the reticulation structure 21 is directly formed on the inner wall of the piston chamber 20, and the soft film 22 is coated on the inner wall of the piston chamber 20 with the reticulation structure 21, and through the arrangement of the soft film 22, on one hand, the inner wall of the piston chamber 20 can have a certain resilience capability, and hard pull can be prevented, and on the other hand, through the arrangement of the soft film 22, the adhesion time of the oil film is also improved.
In the above embodiment, by disposing the flexible film 22 in the piston cavity 20, the flexible film 22 has a certain resilience to prevent hard strain; and through the combination of reticulation structure 21 and soft membrane 22 for soft membrane 22 possesses the effect of adsorbing hydraulic oil, has prolonged the adhesion time of piston chamber 20 inner wall oil film, has improved lubricated effect.
In addition to the above embodiments, the flexible membrane 22 in the embodiment of the present invention is made of graphite, and the surface of the flexible membrane 22 has micropores. Here, the micro-pores refer to pores formed by heating the graphite powder to change the solid state into the liquid state in the process of forming the flexible film 22, and then solidifying the liquid phase and condensing the liquid phase; the pores are a plurality of pores uniformly distributed on the soft film 22, and hydraulic oil can enter the reticulate pattern structure 21 through the pores, so that the attachment time and the lubricating effect of an oil film are further improved; on the other hand, the graphite material has a lubricating effect and also has the heat-resisting and heat-conducting effects, so that the supporting and heat-radiating effects on the piston are improved; moreover, even if hard strain occurs to cause the flexible film 22 to fall off, the flexible film 22 can be combined with the lithium-based grease hydraulic oil due to the graphite material to form a substance similar to lubricating oil, thereby effectively protecting the hydraulic oil system.
As shown in fig. 1, when the control valve signal channel 40a in the related art of the present invention is communicated with the piston cavity 20, a signal ring groove 40b needs to be formed in the piston cavity 20, and referring to fig. 3, in the embodiment of the present invention, the inner end of the control valve signal channel 40 is directly communicated with the piston cavity 20, and the original signal ring groove is omitted. Through the structural improvement, the demand of the signal ring groove 40b on hydraulic oil is reduced, the strength of the middle cylinder body 10 is improved, and the effect of preventing internal leakage can be achieved; further, where the inner end of the control valve signal passage 40 communicates with the piston chamber 20, there is a spherical groove 41 facing the control valve signal passage 40. Through the arrangement of the spherical groove 41, the signal transmission response can be more sensitive, and meanwhile, the overall strength of the middle cylinder body 10 cannot be reduced; in addition, in order to further improve the signal transmission effectiveness, in the embodiment of the present invention, as shown in fig. 3, a branch signal channel 42 communicating with the control valve signal channel 40 is further included. By the arrangement of the branch signal channel 42, the pressure intensity of the control valve signal channel 40 can be reduced, and the reliability of signal transmission can be improved.
In an embodiment of the present invention, there is further provided a method for manufacturing a cylinder in the hydraulic breaking hammer as shown in fig. 4, including the following steps:
s10: forging the middle cylinder body 10, and carrying out flaw detection on the middle cylinder body 10; it should be noted here that during processing, a 20crnimoA arc furnace ingot is strictly selected as 1: 6, forging; whether the quality defect exists in the forge piece can be detected through flaw detection, if the quality defect exists in the forge piece, the qualified forge piece is replaced, and the subsequent loss is reduced; during specific flaw detection, flaw detection is executed according to GBT6402-2008III standard;
s20: carrying out boring and normalizing processes on the centering cylinder body 10, and carrying out secondary flaw detection; normalizing the center cylinder body 1010 to improve the toughness of the forging and reduce the cracking tendency of the forging.
S30: processing an energy storage cavity 30, a control valve signal passage 40 and a reversing valve cavity; during specific processing, processing an energy accumulator pore channel and a control valve signal pore channel in a CNC horizontal processing center; an MCT is used for machining a reversing valve cavity and a control valve signal channel 40 through numerical control turning;
s40: polishing and deburring the centering cylinder body 10, and performing heat treatment; because the inner part of the processed cylinder body is provided with burrs, the cylinder body needs to be polished and deburred, and the specific processing mode can be manual processing or machine processing; after the heat treatment, various inclined holes, straight holes, through screw holes, and the like are processed by a deep hole drill. After the hole site is processed, the working procedures of carburizing heat treatment, cold treatment and tempering are continuously adopted to improve the overall strength of the workpiece;
s50: forming a reticulate pattern structure 21 on the piston cavity 20 after the heat treatment through laser treatment; the laser treatment here is similar to laser engraving, in that a texture 21 is engraved on the inner wall of the piston chamber 20;
s60: after the reticulate pattern structure 21 is formed, cleaning and polishing the centering cylinder body 10; the cleanness of the inner wall of the piston cavity 20 during subsequent coating can be ensured through cleaning; the cleaning can be ultrasonic cleaning, and the polishing uses 3M manual polishing;
s70: coating the soft film 22 in the piston cavity 20;
s80: and (4) carrying out ultrasonic treatment and antirust treatment on the centering cylinder body to finish the processing. Specifically, after the reticulate pattern structure 21 is formed on the middle cylinder body 10, the piston cavity 20 is ground by using an internal grinding machine, so that the reticulate pattern depth is 0.015mm +/-0.01 mm. By ensuring the constant reticulate pattern depth, the consistency and quality of the cylinder body can be ensured.
When coating is specifically performed, an embodiment of the present invention employs a thermal sintering process, specifically: when the soft film 22 is coated inside the piston cavity 20, the graphite powder is firstly extruded and attached to the inner wall of the piston cavity 20, then the graphite powder solidified layer is fixed on the inner wall of the piston cavity 20 through the sintering process to form the soft film 22, and then the soft film 22 is subjected to thermal sintering to form micropores.
Example two
In another embodiment of the present invention, another coating method, namely an electrostatic spraying method, is further adopted, specifically: when the coating treatment of the soft film 22 is carried out on the inner part of the piston cavity 20, incomplete spraying is carried out on the inner wall of the piston cavity 20 in an electrostatic spraying mode, heating and curing are carried out, so that pores are formed in the surface of the soft film 22 after curing is finished, and the electrostatic spraying is carried out for a plurality of times, so that the thickness of the soft film 22 reaches 1.8-2.0 mm. The electrostatic spraying has the advantages that the thickness of the coated film and the control of the pores can be accurately controlled, wherein incomplete spraying means that graphite powder does not completely cover the inner wall of the piston cavity 20 during spraying, so that pores exist on the surface of the coated film during heating and fluidization, a multi-layer pore coated film structure can be formed through multiple spraying, and the performance of the soft film 22 is further improved.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A method for manufacturing a cylinder body in a hydraulic breaking hammer is characterized in that,
the middle cylinder body of the hydraulic breaking hammer comprises a middle cylinder body, wherein a piston cavity penetrates through the middle cylinder body along the length direction of the middle cylinder body, and an energy storage cavity communicated with the piston cavity and a control valve signal channel communicated with the piston cavity are further arranged on the middle cylinder body;
the piston cavity is internally provided with a reticulate pattern structure, and the reticulate pattern structure is uniformly distributed in the whole piston cavity; the outer layer of the reticulate pattern structure is further coated with a soft film to improve the adhesiveness of the soft film, the soft film is made of graphite, the soft film is combined with lithium-based grease hydraulic oil to form a lubricating substance after falling off, the soft film covers the inner wall of the piston cavity, micropores are formed in the surface of the soft film, and hydraulic oil enters the inside of the reticulate pattern structure through the micropores to improve oil film adhesion time and a lubricating effect;
the inner end of the control valve signal channel is directly communicated with the piston cavity, an original signal ring groove is omitted, and a spherical groove facing the control valve signal channel is formed in the communication position of the inner end of the control valve signal channel and the piston cavity; the demand of the original signal ring groove on hydraulic oil is reduced, the strength of the middle cylinder body is improved, and internal leakage is prevented;
the method comprises the following steps:
forging and processing the middle cylinder body, and carrying out flaw detection on the middle cylinder body;
carrying out boring and normalizing processes on the centering cylinder body, and carrying out secondary flaw detection;
processing an energy storage cavity, a control valve signal channel and a reversing valve cavity;
polishing and deburring the centering cylinder body, and performing heat treatment;
forming a reticulate pattern structure on the piston cavity after the heat treatment through laser treatment;
cleaning and polishing the cylinder body after the reticulate pattern structure is formed;
performing film coating treatment on the soft film in the piston cavity; when the coating treatment of the soft film is carried out on the inner part of the piston cavity, incomplete spraying is carried out on the inner wall of the piston cavity in an electrostatic spraying mode, heating and curing are carried out, so that gaps are formed on the surface of the cured soft film, and then electrostatic spraying is carried out for a plurality of times, so that the thickness of the soft film reaches 1.8-2.0 mm;
and (4) carrying out ultrasonic treatment and antirust treatment on the centering cylinder body to finish the processing.
2. The method of claim 1, further comprising a branch signal channel in communication with the control valve signal channel.
3. The method of claim 1, wherein after the mesh structure is formed on the middle cylinder body, the piston chamber is ground by using an internal grinder so that the mesh depth is 0.015mm ± 0.01 mm.
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| CN202110887173.XA CN113550375B (en) | 2021-08-03 | 2021-08-03 | Hydraulic breaking hammer middle cylinder and manufacturing method thereof |
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| CN202110887173.XA CN113550375B (en) | 2021-08-03 | 2021-08-03 | Hydraulic breaking hammer middle cylinder and manufacturing method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204041255U (en) * | 2014-05-04 | 2014-12-24 | 重庆市荣成压铸有限公司 | laser reticulate pattern cylinder body |
| CN104269515A (en) * | 2014-09-19 | 2015-01-07 | 清华大学深圳研究生院 | Negative electrode piece of lithium ion battery, preparation method of negative electrode piece and lithium ion battery |
| CN105605025A (en) * | 2015-11-20 | 2016-05-25 | 安徽安通机械有限公司 | Middle cylinder with oblique groove structure and machining method thereof |
| CN213613892U (en) * | 2020-10-14 | 2021-07-06 | 江苏一重锻造有限公司 | Double-arm type free forging electro-hydraulic hammer unloading device for ship forge piece |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107541660B (en) * | 2017-09-27 | 2019-01-25 | 马鞍山平文锻造有限公司 | A kind of high-performance crushing plant rear-bank rotor housing and its processing method |
| KR102103906B1 (en) * | 2018-05-18 | 2020-05-29 | 주식회사수산중공업 | Hydraulic breaker with auto lubrication structure |
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- 2021-08-03 CN CN202110887173.XA patent/CN113550375B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204041255U (en) * | 2014-05-04 | 2014-12-24 | 重庆市荣成压铸有限公司 | laser reticulate pattern cylinder body |
| CN104269515A (en) * | 2014-09-19 | 2015-01-07 | 清华大学深圳研究生院 | Negative electrode piece of lithium ion battery, preparation method of negative electrode piece and lithium ion battery |
| CN105605025A (en) * | 2015-11-20 | 2016-05-25 | 安徽安通机械有限公司 | Middle cylinder with oblique groove structure and machining method thereof |
| CN213613892U (en) * | 2020-10-14 | 2021-07-06 | 江苏一重锻造有限公司 | Double-arm type free forging electro-hydraulic hammer unloading device for ship forge piece |
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