CN110842486A - Processing-free powder metallurgy valve guide pipe and processing method and application thereof - Google Patents
Processing-free powder metallurgy valve guide pipe and processing method and application thereof Download PDFInfo
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- CN110842486A CN110842486A CN201911190661.4A CN201911190661A CN110842486A CN 110842486 A CN110842486 A CN 110842486A CN 201911190661 A CN201911190661 A CN 201911190661A CN 110842486 A CN110842486 A CN 110842486A
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- 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
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Abstract
The invention belongs to the technical field of machining, and particularly relates to a machining-free powder metallurgy valve guide pipe and a machining method and application thereof. The invention provides a processing method of a processing-free powder metallurgy valve guide pipe, which comprises the following steps: and (3) sequentially carrying out rough grinding of the outer circle, boring, rough honing of the inner hole, grinding of the outer circle by a core rod, finish turning of the chamfer, finish honing of the inner hole, finish grinding of the outer circle and oil boiling on the workpiece blank to obtain the processing-free powder metallurgy valve guide. The experimental effect shows that the machining-free powder metallurgy valve guide pipe obtained by the machining method does not need to be reamed when being assembled for use, can be directly pressed into a cylinder cover and then matched with a valve and a valve seat, and has good assembly precision.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a machining-free powder metallurgy valve guide pipe and a machining method and application thereof.
Background
The valve guide pipe is a guide device of the automobile engine valve, ensures the valve to do reciprocating linear motion by guiding the motion of the valve, ensures that the valve and a valve seat ring can be correctly attached, and transmits the heat of a valve rod to a cylinder cover. When the engine works, because the combustible gas is ignited after being compressed in the combustion chamber of the cylinder cover, the valve guide pipe needs to bear high thermal load and mechanical load, which requires the valve guide pipe to have high wear resistance and good sealing property; also, if the valve stem is off-center during operation, this can result in increased fuel consumption, in addition to detrimental heat transfer and accelerated wear of the valve stem and the conduit holes. Therefore, the machining precision of the valve guide pipe hole has important influence on the service performance and the service life of the engine, and the internal combustion engine industry puts higher requirements on the machining precision of the valve guide pipe.
The valve guide pipe is processed according to the traditional method, and the hole is drilled, reamed and finely cleaned, so that although the inner diameter of the obtained valve guide pipe meets the requirement of a drawing, the phenomenon that a valve rod cannot pass through the valve guide pipe often occurs during the assembly of a cylinder cover, the valve guide pipe which can be directly used cannot be obtained due to the fact that the straightness of the valve guide pipe exceeds the standard, the valve guide pipe is inevitably required to be reamed when the valve guide pipe is used in each internal combustion engine plant, although the valve guide pipe which can be assembled and used is obtained to a certain extent, the precision of the valve guide pipe is adversely affected by the reprocessing during the use.
In recent years, the internal combustion engine industry at home and abroad puts higher requirements on the mechanical processing of the cylinder cover with a complex structure, wherein the processing of the valve guide pipe is the key of the process technology, and how to obtain the valve guide pipe which can be directly pressed and used without reaming processing during assembly and use has positive influence on the improvement of the processing precision of the valve guide pipe; however, no mature technical means for processing-free powder metallurgy valve guides exists in the field, and how to design and adjust the processing procedure is not determined by researchers in the field.
Disclosure of Invention
In view of the above, the present invention aims to provide a processing method for a processing-free powder metallurgy valve guide, wherein the valve guide obtained by the processing method provided by the present invention does not need to be reamed when being assembled for use, can be directly pressed into a cylinder cover to match a valve and a valve seat, and has good assembly precision.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a processing method of a processing-free powder metallurgy valve guide pipe, which comprises the following steps:
and (3) sequentially carrying out rough grinding of the outer circle, boring, rough honing of the inner hole, grinding of the outer circle by a core rod, finish turning of the chamfer, finish honing of the inner hole, finish grinding of the outer circle and oil boiling on the workpiece blank to obtain the processing-free powder metallurgy valve guide.
Preferably, the size precision of the boring hole is +/-0.04 mm.
Preferably, the dimensional accuracy of the rough honing inner hole is +/-0.03 mm, and the straightness is less than or equal to 0.01 mm.
Preferably, the size precision of the excircle of the core-through rod mill is +/-0.01 mm, the coaxiality is less than or equal to 0.02mm, and the straightness is less than or equal to 0.01 mm; the Rockwell hardness of the core rod for grinding the excircle of the core rod is more than or equal to HRC 60.
Preferably, the angle tolerance of the finish turning chamfer is +/-1 degree, the depth tolerance is +/-0.05 mm, and the width tolerance is +/-0.05 mm.
Preferably, the precision of the aperture size of the finely honed inner hole is +/-0.01 mm, the coaxiality is less than or equal to 0.02mm, the straightness is less than or equal to 0.01mm, and the roughness of the inner hole is less than or equal to 0.8 Ra.
Preferably, the size precision of the fine grinding excircle is less than or equal to 0.015mm, the roundness is less than or equal to 0.008mm, and the roughness is less than or equal to 0.8 Ra.
Preferably, the temperature of the oil boiling treatment is 100-120 ℃, and the time is 8-10 min.
The invention also provides the processing-free powder metallurgy valve guide pipe obtained by the processing method in the technical scheme.
The invention also provides the application of the processing-free powder metallurgy valve guide obtained by the processing method in the technical scheme in an internal combustion engine.
The invention provides a processing method of a processing-free powder metallurgy valve guide pipe, which comprises the following steps: and (3) sequentially carrying out rough grinding of the outer circle, boring, rough honing of the inner hole, grinding of the outer circle of the core rod, finish turning of the chamfer, finish honing of the inner hole, finish grinding of the outer circle and oil boiling on the workpiece blank to obtain the machining-free powder metallurgy valve guide pipe which meets the precision requirement of a drawing on the valve guide pipe. The processing-free powder metallurgy valve guide pipe obtained through the working procedures has high precision, can be directly pressed into a cylinder cover and then matched with a valve and a valve seat of the valve when being put into use, namely the valve does not need to be matched with the valve for reaming when being assembled and used, and has the characteristic of precise matching with the valve.
Detailed Description
The invention provides a processing method of a processing-free powder metallurgy valve guide pipe, which comprises the following steps:
and (3) sequentially carrying out rough grinding of the outer circle, boring, rough honing of the inner hole, grinding of the outer circle by a core rod, finish turning of the chamfer, finish honing of the inner hole, finish grinding of the outer circle and oil boiling on the workpiece blank to obtain the processing-free powder metallurgy valve guide.
The source of the workpiece blank is not particularly limited in the present invention, and any source known to those skilled in the art may be used. In the present invention, the method for preparing the workpiece blank preferably comprises the steps of:
and sequentially carrying out powder mixing, forming and sintering treatment on the raw material metal powder to obtain a workpiece blank.
According to the invention, the raw material metal powder is preferably mixed to obtain mixed powder. The invention has no special limitation on the element composition of the raw material metal powder, and the requirement on the performance of the valve guide pipe is taken as the standard. In the invention, the powder mixing mode is preferably a component mixing technology; the component mixing technology specifically comprises the step of mixing a plurality of different element raw materials together according to a designed proportion to obtain mixed powder. In the invention, the mixed powder is preferably prepared by proportionally combining powder with different components and powder with different performance requirements, adding an abrasion-resistant substance and a solid lubricant, and more preferably mixing the following raw materials: the electrolytic copper powder comprises, by mass, 2-3% of carbon powder, 1-2% of zinc stearate, 10-12% of chromium powder, 10-11% of molybdenum powder, 4-5% of electrolytic copper powder, 2-3% of reinforcing agent and the balance iron-based powder. In the present invention, the reinforcing agent is preferably polyvinyl acetate. The reinforcing agent is added, so that a thin layer of uniform reinforcing agent film can be coated on the surface of the powder metallurgy, the friction coefficient of the iron powder and the surface of a die in the pressing and demoulding process is greatly reduced, the die loss is reduced, the demoulding force is reduced, and the surface glossiness of the product is favorably improved.
After the mixed powder is obtained, the mixed powder is preferably subjected to forming treatment to obtain a pressed blank. In the invention, the temperature of the forming treatment is preferably 120-150 ℃, more preferably 125-145 ℃, and further preferably 130-145 ℃; the time is preferably 35 to 45s, more preferably 37 to 42s,and more preferably 40 s. In the invention, the process of the forming treatment is preferably a warm pressing process; the specific operation of the warm-pressing process is not particularly limited in the invention, and the warm-pressing process known to those skilled in the art can be used. In the invention, the density of the pressed blank is preferably 6.5-7.0 g/cm3More preferably 6.6 to 7.0g/cm3. According to the invention, through the forming treatment, the pores of the mixed powder are effectively compacted to obtain a compact pressed blank, which is beneficial to increasing the compactness of the final product valve guide pipe, thereby improving the wear resistance of the valve guide pipe.
After obtaining the pressed blank, the invention preferably performs sintering treatment on the pressed blank to obtain a workpiece blank. In the invention, the sintering mode is preferably push-rod sintering, specifically, the pressed blank is placed on a carbon plate sintering boat, and the push-rod automatic cycle push boat is put into a furnace for sintering. The temperature and time of the sintering are not particularly limited in the invention and are determined by the performance requirements of the valve guide. The invention effectively prevents the phenomena of oxidation, deformation, decarburization and the like of the pressed blank through sintering, fully diffuses different components in the blank material of the workpiece, and is beneficial to the improvement of the mechanical property of the valve guide.
After the workpiece blank is obtained, the workpiece blank is subjected to rough grinding excircle processing to obtain a rough grinding excircle piece. The process for roughly grinding the outer circle is not particularly limited in the invention, and the process for roughly grinding the outer circle, which is well known to those skilled in the art, can be adopted. In the present invention, the remaining amount of the rough grinding treatment is preferably 0.06 mm; the roughness is preferably less than or equal to 0.8 Ra; the cylindricity is preferably less than or equal to 0.01 mm.
After the rough grinding excircle piece is obtained, boring is carried out on the rough grinding excircle piece to obtain a bored piece. In the present invention, the dimensional accuracy of the bore is preferably ± 0.04mm, more preferably ± 0.03mm, and still more preferably ± 0.02 mm. The boring process is not particularly limited in the present invention, and a boring process known to those skilled in the art may be used.
Before boring, the invention preferably carries out appearance flaw detection on the rough grinding outer round piece. The apparatus and method for the visual inspection of the present invention are not particularly limited, and those known to those skilled in the art may be used. According to the invention, appearance flaw detection is carried out before boring, cracks, hidden damages and defects of the rough grinding excircle piece are detected, the rough grinding excircle piece without cracks, hidden damages and defects is selected for subsequent process operation, the problem that the operation safety risk of the rough grinding excircle piece with the defects is increased due to easy fracture in the subsequent process is prevented, and the fracture risk of the valve guide obtained after the subsequent process is carried out continuously when the valve guide is used in an installing machine is solved.
After the boring piece is obtained, the boring piece is subjected to rough honing inner hole treatment to obtain the rough honing inner hole piece. In the invention, the dimensional accuracy of the rough honing inner hole is preferably +/-0.03 mm, and more preferably +/-0.01 mm; the straightness is preferably 0.01mm or less, more preferably 0.008mm or less. The process for roughly honing the inner hole is not particularly limited, and the process for roughly honing the inner hole, which is well known to a person skilled in the art, can be adopted. According to the invention, through rough honing of the inner hole, the hole diameter is more accurate, the straightness is higher, and the dimensional accuracy of the valve guide pipe is improved conveniently.
After the rough honing inner hole piece is obtained, the rough honing inner hole piece is subjected to core-penetrating rod grinding excircle processing to obtain a core-penetrating rod grinding excircle piece. In the invention, the size precision of the excircle of the core-through rod mill is preferably +/-0.01 mm, and more preferably +/-0.008 mm; the coaxiality is preferably less than or equal to 0.02mm, and more preferably less than or equal to 0.01 mm; the straightness is preferably 0.01mm or less, more preferably 0.008mm or less. The invention utilizes the core rod to fix the inner diameter of the workpiece to grind the excircle, thereby ensuring the processing coaxiality of the workpiece. In the invention, the size precision of the core rod for grinding the excircle of the core rod is preferably +/-0.005 mm, and more preferably +/-0.004 mm; the Rockwell hardness is preferably not less than HRC60, more preferably 60-70 HRC, and still more preferably 65-70 HRC.
After the mandrel-through rod grinding excircle piece is obtained, the mandrel-through rod grinding excircle piece is subjected to finish turning chamfering treatment to obtain a finish turning chamfering piece. In the invention, the precision of the angle of the finish turning chamfer is preferably +/-1 degree, and more preferably +/-0.5 degree; the depth precision is preferably +/-0.05 mm, more preferably +/-0.04 mm, and is further preferably +/-0.03 mm; the width accuracy is preferably + -0.05 mm, more preferably + -0.04 mm, and still more preferably + -0.03 mm.
After the finish turning chamfering piece is obtained, the finish turning chamfering piece is subjected to finish honing inner hole treatment to obtain the finish honing inner hole piece. In the invention, the precision of the aperture size of the finely honed inner hole is preferably +/-0.01 mm, more preferably +/-0.008 mm, and further preferably +/-0.006 mm; the coaxiality is preferably less than or equal to 0.02mm, and more preferably less than or equal to 0.01 mm; the straightness is preferably less than or equal to 0.01mm, and more preferably less than or equal to 0.008 mm; the inner pore roughness is preferably 0.8Ra or less, more preferably 0.6Ra or less.
After the fine honing inner hole piece is obtained, the fine honing inner hole piece is subjected to fine grinding excircle processing to obtain a fine grinding excircle piece. In the present invention, the dimensional accuracy of the fine-ground outer circle is preferably 0.015mm or less, more preferably 0.013mm or less, still more preferably 0.01mm or less; the roundness is preferably less than or equal to 0.008mm and more preferably less than or equal to 0.006 mm; the roughness is preferably 0.8Ra or less, more preferably 0.6Ra or less.
After the fine grinding excircle piece is obtained, the fine grinding excircle piece is subjected to oil boiling treatment to obtain the processing-free powder metallurgy valve guide pipe. In the invention, the temperature of the oil boiling treatment is preferably 100-120 ℃, and more preferably 105-115 ℃; the time is preferably 8 to 10min, and more preferably 8.5 to 9.5 min. The process of the cooking oil treatment in the present invention is not particularly limited, and a cooking oil treatment process known to those skilled in the art may be used. The invention removes the water adhered to the valve guide pipe in the processing process at high temperature through oil boiling treatment, so that the valve guide pipe is not easy to rust; and simultaneously, the machining stress is eliminated, and the dimensional stability of the valve guide pipe is kept. In the invention, the replacement period of the oil product for oil boiling treatment is preferably 10-20 days, more preferably 10-15 days, and further preferably 10-13 days.
After the processing-free powder metallurgy valve guide pipe is obtained, the processing-free powder metallurgy valve guide pipe is preferably packaged and warehoused. Before the packaging and warehousing, the processing-free powder metallurgy valve guide pipe is preferably subjected to quality inspection, and qualified products are packaged and warehoused; the quality inspection preferably comprises physical property detection and appearance detection; the physical property detection preferably comprises size detection and mechanical property detection; the appearance inspection preferably includes checking whether the appearance contains pores, impurities, porosity and cracks. The invention ensures the qualification rate of the processing-free powder metallurgy valve guide pipe which is packaged and put in storage through quality inspection. Before packaging and warehousing, the processing-free powder metallurgy valve guide pipe is preferably soaked in anti-rust oil; the process for soaking the anti-rust oil is not particularly limited, and the process for soaking the anti-rust oil, which is well known to those skilled in the art, can be adopted. The invention further improves the anti-rust capability of the product by soaking the anti-rust oil, and ensures that the precision of the valve guide pipe is not reduced due to rust through anti-rust.
The invention also provides the processing-free powder metallurgy valve guide pipe obtained by the processing method in the technical scheme.
The invention also provides application of the processing-free powder metallurgy valve guide obtained by the processing method in the technical scheme in the field of internal combustion engines. The valve guide pipe obtained by the processing method provided by the invention is preferably directly assembled for use without reaming during assembly, can be directly pressed into a cylinder cover and then matched with a valve and a valve seat, and has good assembly precision.
In order to further illustrate the present invention, the processing-free powder metallurgy valve guide and the processing method and application thereof provided by the present invention are described in detail below with reference to the examples, but they should not be construed as limiting the scope of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparing a workpiece blank:
1. mixing components: mixing carbon powder 2%, zinc stearate 1%, chromium powder 11%, molybdenum powder 10%, electrolytic copper powder 5%, reinforcing agent 3% and the balance of iron-based powder by adopting a 'component mixing technology' in percentage by mass to obtain mixed powder, wherein the reinforcing agent is polyvinyl acetate;
2. molding: the adopted warm pressing process is that the mixed powder is mechanically pressed at the temperature of 140 DEG CThe density of the product reaches 6.9g/cm3The product density is improved, the product compactness is effectively increased, the material has better wear resistance, and a primary blank is obtained;
3. and (3) sintering: placing the primary blank on a carbon plate sintering boat, pushing the boat into a furnace in a push rod type automatic circulation mode, setting the sintering temperature to be 1100 ℃, sintering the primary blank in three areas, setting the sintering temperature in the first area to be 600 ℃, setting the sintering temperature in the second area to be 900 ℃, setting the sintering temperature in the third area to be 1100 ℃, and setting the sintering time in each area for 15min to obtain the workpiece blank.
Processing of the valve guide pipe:
1. rough grinding of the excircle: according to a product process drawing, roughly grinding the outer circle of a workpiece blank once to ensure that the roughness of the outer circle of the product is less than or equal to 0.8Ra and the cylindricity is less than or equal to 0.01mm, and controlling the roughness and the cylindricity of the outer circle within the process requirements to obtain a roughly-ground outer circle part;
2. appearance flaw detection: enabling all the roughly ground outer round pieces to pass through a full-automatic flaw detection machine for flaw detection such as cracks and hidden flaws, and enabling the workpieces with qualified appearance flaw detection to enter a subsequent process;
3. boring: boring the rough-ground excircle piece with qualified appearance flaw detection, wherein the dimensional precision is +/-0.04 mm, and thus obtaining a bored piece;
4. roughly honing the inner hole: roughly honing an inner hole of the boring part, wherein the dimensional precision of the roughly honed inner hole is +/-0.03 mm, and the straightness is less than or equal to 0.01mm, so that the roughly honed inner hole part is obtained;
5. grinding the excircle of the core rod: grinding an excircle by utilizing a core rod to fix the inner diameter of a rough honing inner hole part, controlling the dimensional precision of the core rod to be +/-0.005 mm, adopting a tungsten steel material as the core rod, having the Rockwell hardness of 68HRC, carrying out quantitative processing, timely replacing the core rod after the number of core rod processing workpieces reaches a certain value, controlling the excircle dimension of the core rod-penetrating grinding to be +/-0.01 mm, controlling the coaxiality to be not more than 0.02mm and controlling the straightness to be not more than 0.01mm, and thus obtaining a core rod-penetrating grinding excircle part;
6. finely turning and chamfering: carrying out finish turning chamfering on the obtained cylindrical grinding part of the core-penetrating rod, wherein the angle precision during the finish turning chamfering is within +/-1 degrees, the depth precision is within +/-0.05 mm, and the width precision size is required to be +/-0.05 mm, so as to obtain a finish turning chamfering part;
7. finely honing the inner hole: finely honing the inner hole of the obtained finely-turned chamfer part, wherein the precision of the hole diameter size is +/-0.01 mm, the coaxiality is less than or equal to 0.02mm, the straightness is less than or equal to 0.01mm, and the roughness of the inner hole is less than or equal to 0.8Ra to obtain a finely-honed inner hole part;
8. fine grinding of the excircle: carrying out fine grinding on the obtained fine honing inner hole part to obtain a fine grinding outer circle part, wherein the size precision of the fine grinding outer circle is less than or equal to 0.015mm, the roundness is less than or equal to 0.008mm, and the roughness is less than or equal to 0.8 Ra;
9. cooking oil: carrying out oil boiling treatment on the obtained fine grinding excircle piece for 8min at the oil temperature of 105 ℃ to obtain a processing-free powder metallurgy valve guide; soaking anti-rust oil after cooling the machining-free powder metallurgy valve guide pipe;
10. and (3) appearance full inspection: carrying out appearance detection on the appearance of the processing-free powder metallurgy valve guide pipe, and carrying out full detection on defects such as air holes, impurities, looseness, cracks and the like;
11. packaging and warehousing: and after the appearance is completely inspected, cleaning, packaging and warehousing according to the product packaging instruction.
After the processing-free powder metallurgy valve guide pipe is delivered to an internal combustion engine factory, reaming is not needed in the internal combustion engine assembling process, the processing-free powder metallurgy valve guide pipe can be directly pressed into a cylinder cover and then matched with a valve and a valve seat, and the assembling precision is good.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A processing method of a processing-free powder metallurgy valve guide pipe is characterized by comprising the following steps:
and (3) sequentially carrying out rough grinding of the outer circle, boring, rough honing of the inner hole, grinding of the outer circle by a core rod, finish turning of the chamfer, finish honing of the inner hole, finish grinding of the outer circle and oil boiling on the workpiece blank to obtain the processing-free powder metallurgy valve guide.
2. The machining method according to claim 1, wherein the dimensional accuracy of the bore is ± 0.04 mm.
3. The machining method according to claim 1, wherein the dimensional accuracy of the roughly honed inner hole is ± 0.03mm, and the straightness is less than or equal to 0.01 mm.
4. The processing method according to claim 1, wherein the dimensional accuracy of the outer circle of the core-through rod mill is +/-0.01 mm, the coaxiality is less than or equal to 0.02mm, and the straightness is less than or equal to 0.01 mm; the Rockwell hardness of the core rod for grinding the excircle of the core rod is more than or equal to HRC 60.
5. The method of claim 1, wherein the finish-turned chamfers have an angular tolerance of ± 1 °, a depth tolerance of ± 0.05mm, and a width tolerance of ± 0.05 mm.
6. The machining method according to claim 1, wherein the precision of the bore diameter size of the finish-honed inner bore is +/-0.01 mm, the coaxiality is less than or equal to 0.02mm, the straightness is less than or equal to 0.01mm, and the roughness of the inner bore is less than or equal to 0.8 Ra.
7. The processing method according to claim 1, wherein the dimensional accuracy of the fine-ground outer circle is not more than 0.015mm, the roundness is not more than 0.008mm, and the roughness is not more than 0.8 Ra.
8. The processing method according to claim 1, wherein the temperature of the oil boiling treatment is 100 to 120 ℃ and the time is 8 to 10 min.
9. A processing-free powder metallurgy valve guide obtained by the processing method of any one of claims 1 to 8.
10. Use of a process-free powder metallurgy valve guide obtained by the process method according to any one of claims 1 to 8 in an internal combustion engine.
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| CN201911190661.4A CN110842486A (en) | 2019-11-28 | 2019-11-28 | Processing-free powder metallurgy valve guide pipe and processing method and application thereof |
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| US20090194060A1 (en) * | 2008-02-05 | 2009-08-06 | Mark Iv Systemes Moteurs | Method for producing a support plate for valve bodies and a support plate |
| CN102189262A (en) * | 2011-04-26 | 2011-09-21 | 常熟市双月机械有限公司 | Valve guide pipe |
| CN105149596A (en) * | 2015-08-31 | 2015-12-16 | 苏州莱特复合材料有限公司 | Powder metallurgy valve gas pipe and preparation method thereof |
| CN110091127A (en) * | 2019-04-25 | 2019-08-06 | 上海航天精密机械研究所 | A kind of thin-wall long and thin pipe fitting entirety precision machining method |
-
2019
- 2019-11-28 CN CN201911190661.4A patent/CN110842486A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090194060A1 (en) * | 2008-02-05 | 2009-08-06 | Mark Iv Systemes Moteurs | Method for producing a support plate for valve bodies and a support plate |
| CN102189262A (en) * | 2011-04-26 | 2011-09-21 | 常熟市双月机械有限公司 | Valve guide pipe |
| CN105149596A (en) * | 2015-08-31 | 2015-12-16 | 苏州莱特复合材料有限公司 | Powder metallurgy valve gas pipe and preparation method thereof |
| CN110091127A (en) * | 2019-04-25 | 2019-08-06 | 上海航天精密机械研究所 | A kind of thin-wall long and thin pipe fitting entirety precision machining method |
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Application publication date: 20200228 |