CN114893271B - Production process of plug-in tappet welding structure - Google Patents
Production process of plug-in tappet welding structure Download PDFInfo
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- CN114893271B CN114893271B CN202210635381.5A CN202210635381A CN114893271B CN 114893271 B CN114893271 B CN 114893271B CN 202210635381 A CN202210635381 A CN 202210635381A CN 114893271 B CN114893271 B CN 114893271B
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- base
- tappet
- shell
- welding
- copper ring
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- 238000003466 welding Methods 0.000 title claims abstract description 76
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000000227 grinding Methods 0.000 claims description 21
- 239000002994 raw material Substances 0.000 claims description 18
- 238000005496 tempering Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- 230000006698 induction Effects 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000005121 nitriding Methods 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention discloses a production process of an inserted tappet welding structure. The plug-in tappet welding structure comprises a shell and a base, wherein a pair of oil holes are transversely formed in the shell, a ball socket working surface is arranged on the base, the bottom surface of the base is a base bottom working surface, an inner cavity of the shell is spliced with the upper portion of the base, a welding gap L is reserved between the connecting position of the inner cavity of the shell and the upper portion of the base, a circle of arc-shaped base step surface is formed in the top end of the connecting position of the upper portion of the base, and a circle of copper ring welding wires are arranged in the base step surface. The invention adopts the plug-in welding structure and the process, has simple and reliable structure, simple processing process and better welding performance, and can greatly reduce the material cost because the plug-in welding shell can adopt the materials such as 45 # steel or 40Cr and the like with relatively low price and the base adopts the X210CrW12 material.
Description
Technical Field
The invention relates to the technical field of engine valve lifters, in particular to a production process of an inserted lifter welding structure.
Background
The existing flat-bottom mechanical tappet is mainly divided into an integral type and a hard alloy welding type; the integral mechanical valve tappet is mainly made of an X210CrW12 material and a chilled cast iron material, and the bottom end surface is nitrided or plated, so that the machining is difficult due to the high hardness of the material, the precise size is not well controlled, and the machining cost is increased; the hard alloy welded valve tappet is shown in a patent CN201320062215, and is mainly formed by welding a column body made of SWRCH45K, C EC or 40Cr materials and a hard alloy sheet by using a pure copper soldering lug.
There are also split-type structural design tappet, such as a cup-shaped valve tappet described in patent CN201920427105, but the split-type structure of the tappet is positioned and fixed by a clamping point, the process of processing and positioning the clamping point is complex, the process requirement is high, and meanwhile, the split-type structure is easy to have relative movement, so that the use of the product is affected.
Disclosure of Invention
In order to solve the technical problems, the invention designs a production process of an inserted tappet welding structure.
The invention adopts the following technical scheme:
the utility model provides an bayonet tappet welded structure, includes casing and base, transversely is provided with a pair of oilhole on the casing, sets up ball socket working face on the base, and the base bottom surface is base bottom working face, casing inner chamber and base upper portion grafting, the welding clearance L is left between casing inner chamber and base upper portion junction, and base upper portion junction top is provided with round convex base step face, has settled round copper ring welding wire in the base step face.
Preferably, the bottom of the inner cavity of the shell is provided with a bevel chamfer for positioning, the bottom of the joint at the upper part of the base is correspondingly provided with a circle of base bevel, and the bevel chamfer is consistent with the bevel angle of the base bevel.
Preferably, the inner diameter of the inner cavity of the shell is 0.1mm larger than the outer diameter of the joint of the upper part of the base.
The production process steps of the inserted tappet welding structure are as follows:
s1, blanking: in the blanking stage, steel pipes are selected as blank making raw materials of the shell, copper wires are selected as blank making raw materials of copper ring welding wires, and bars are selected as blank making raw materials of the base;
S2, turning and winding the sub-parts: turning the outer circular surface of the shell, the inner circular surface of the shell matched with the outer circular surface of the base, the positioning surface of the shell and the base matched with the inclined surface of the base and the upper and lower end surfaces of the shell under the blank making raw material of the shell, and carrying out oil hole machining by using a punching or drilling and milling method if the tappet has an oil hole;
Turning an outer circular surface of a base matched with an inner circular surface of a shell, a base inclined surface matched with a base positioning surface of the shell, a base step surface for placing copper ring welding wires, a ball socket working surface and upper and lower end surfaces of the base under a blank manufacturing raw material of the base;
Winding a copper wire into a copper ring by using a ring winding machine under the blank making raw material of the copper ring welding wire, and cutting off to form the copper ring welding wire;
S3, assembling the sub-parts before welding:
Placing a copper ring welding wire on a base step surface of a base, and then inserting the base and the copper ring welding wire into a shell together until an inclined chamfer at the bottom of an inner cavity of the shell compresses an inclined surface of the base;
S4, welding and heat treatment:
Putting the assembled tappet into a mesh belt furnace for welding, wherein the welding temperature is between 850 and 1100 ℃, the base is quenched at the same time, in the welding process, a copper ring welding wire is heated and melted and flows into an annular welding gap L reserved between the inner cavity of the shell and the outer circular surface of the base, and the copper which is cooled and resolidified forms a welding line to weld the shell and the base into a whole; and carrying out low-temperature tempering and stress relief annealing on the base;
S5, grinding the tappet:
Grinding a reference surface of the outer circular surface of the tappet housing by a centerless grinding or cutting grinding mode after heat treatment, then clamping the reference surface of the outer circular surface of the housing to grind a working surface at the bottom of the tappet base, and controlling the roughness, convexity and runout of the working surface at the bottom of the tappet base according to the use requirement;
s6, nitriding treatment of the working surface at the bottom of the tappet base:
Performing nitriding treatment after grinding the working surface at the bottom of the tappet base, and controlling the surface hardness, the white layer depth, the diffusion layer depth, the brittleness level and the loose layer level of the nitrided working surface at the bottom of the tappet base according to the use requirement;
s7, heat treatment of the outer circular surface of the tappet housing:
carrying out induction quenching on the outer circumferential surface of the tappet housing, wherein the surface hardness of the outer circumferential surface of the tappet housing is not lower than 550HV10 by the induction quenching, the depth of a hardening layer is not lower than 0.5mm, and carrying out low-temperature tempering on the tappet by a box tempering furnace after the induction quenching;
S8, finish grinding the outer circular surface of the tappet housing:
and (3) carrying out finish grinding on the outer circular surface of the tappet housing after heat treatment, and controlling the diameter, the roughness and the cylindricity of the outer circular surface of the housing according to the use requirement.
Preferably, in the step S4, the hardness of the tappet seat after quenching is 52-58HRC.
Preferably, in the step S4, the low-temperature tempering temperature is 200-220 ℃, the stress relief temperature is 600-700 ℃, and the hardness of the annealed tappet seat is above 48 HRC.
Preferably, in the step S1, the steel pipe is 45 steel or 40Cr steel pipe.
Preferably, in the step S1, the copper wire is a HL105 or S225 or T2 brand copper wire.
Preferably, in the step S1, the bar stock is a bar stock made of X210CrW material.
Preferably, in the step S7, the low temperature tempering temperature is 120-200 ℃, and the tempering time is controlled to be 40 minutes to 1.5 hours.
The beneficial effects of the invention are as follows: the invention adopts the plug-in welding structure and the process, has simple and reliable structure, simple processing process and better welding performance, and can greatly reduce the material cost because the plug-in welding shell can adopt the materials such as 45 # steel or 40Cr and the like with relatively low price and the base adopts the X210CrW12 material.
Drawings
FIG. 1 is an exploded view of the welded structure of the plug-in tappet of the present invention;
FIG. 2 is a cross-sectional view of the plug-in tappet weld construction of the present invention prior to welding;
FIG. 3 is an enlarged view of FIG. 2 at A;
FIG. 4 is a cross-sectional view of the welded structure of the plug-in tappet of the present invention;
FIG. 5 is an enlarged view of FIG. 4 at A;
FIG. 6 is a cross-sectional view of the housing of the present invention;
FIG. 7 is a cross-sectional view of the base of the present invention;
In the figure: 1. the welding device comprises a shell, 1-1 parts of an outer circular surface of the shell, 1-2 parts of an inner circular surface of the shell, 1-3 parts of oil holes, 1-4 parts of a positioning surface of the shell and a base, 1-5 parts of an upper end surface and a lower end surface of the shell, 2 parts of the base, 2-1 parts of an outer circular surface of the base, 2-2 parts of an inclined surface of the base, 2-3 parts of a step surface of the base, 2-4 parts of a ball socket working surface, 2-5 parts of a working surface of the bottom of the base, 3-1 parts of copper ring welding wires, 3-2 parts of welding seams.
Detailed Description
The technical scheme of the invention is further specifically described by the following specific embodiments with reference to the accompanying drawings:
Examples: as shown in the attached drawings 1-5, the plug-in tappet welding structure comprises a shell 1 and a base 2, wherein a pair of oil holes 1-3 are transversely formed in the shell 1, a ball socket working surface 2-4 is arranged on the base 2, the bottom surface of the base 2 is a base bottom working surface 2-5, and the plug-in tappet welding structure is characterized in that an inner cavity of the shell 1 is spliced with the upper part of the base 2, a welding gap L is reserved between the inner cavity of the shell 1 and the upper part of the base 2, a circle of circular arc-shaped base step surface 2-3 is formed in the top end of the upper part of the base 2, and a circle of copper ring welding wires 3-1 are arranged in the base step surface 2-3.
The bottom of the inner cavity of the shell 1 is provided with a bevel chamfer for positioning, the bottom of the joint of the upper part of the base 2 on the base 2 is correspondingly provided with a circle of base bevel 2-2, and the bevel chamfer is consistent with the bevel angle of the base bevel 2-2.
The inner diameter of the inner cavity of the shell 1 is larger than the outer diameter of the joint of the upper part of the base 2 by 0.1mm.
The production process steps of the inserted tappet welding structure are as follows:
S1, blanking: in the blanking stage, a steel pipe is selected as a blank making raw material of the shell 1, a copper wire is selected as a blank making raw material of the copper ring welding wire 3-1, and a bar is selected as a blank making raw material of the base 2;
S2, turning and winding the sub-parts:
As shown in fig. 6, turning the outer circumferential surface 1-1 of the shell 1, the inner circumferential surface 1-2 of the shell matched with the outer circumferential surface 2-1 of the base, the positioning surface 1-4 of the shell and the base matched with the inclined surface 2-2 of the base, and the upper and lower end surfaces 1-5 of the shell under the blank making raw material of the shell 1, and if the tappet has a hole, processing the oil hole 1-3 by using a punching or drilling and milling method;
as shown in fig. 7, a base outer circular surface 2-1 matched with a shell inner circular surface 1-2, a base inclined surface 2-2 matched with a base positioning surface 1-4, a base step surface 2-3 for placing a copper ring welding wire 3-1, a ball socket working surface 2-4 and upper and lower end surfaces of a base are turned under the blank making raw material of the base 2;
winding a copper wire into a copper ring by using a ring winding machine under the blank making raw material of the copper ring welding wire, and cutting off to form a copper ring welding wire 3-1;
S3, assembling the sub-parts before welding:
Placing a copper ring welding wire 3-1 on a base step surface 2-3 of a base 2, and then inserting the base 2 and the copper ring welding wire 3-1 into a shell 1 together until an inclined chamfer at the bottom of an inner cavity of the shell 1 compresses a base inclined surface 2-2;
S4, welding and heat treatment:
Putting the assembled tappet into a mesh belt furnace for welding, wherein the welding temperature is between 850 and 1100 ℃, the base 2 is quenched at the same time, in the welding process, a copper ring welding wire is heated and melted and flows into an annular welding gap L reserved between an inner cavity of the shell and an outer circular surface 2-1 of the base, and copper which is cooled and resolidified forms a welding line 3-2 to weld the shell 1 and the base 2 into a whole; and carrying out low-temperature tempering and stress relief annealing on the base;
S5, grinding the tappet:
grinding the reference surface of the outer circular surface 1-1 of the tappet housing by a centerless grinding or cutting grinding mode after heat treatment, then clamping the reference surface of the outer circular surface 1-1 of the housing to grind the working surface 2-5 at the bottom of the tappet base, and controlling the roughness, convexity and runout of the working surface 2-5 at the bottom of the tappet base according to the use requirement;
s6, nitriding treatment is carried out on the working surface 2-5 at the bottom of the tappet base:
Grinding the working surface 2-5 at the bottom of the tappet base, and then carrying out nitriding treatment, wherein the surface hardness, the white layer depth, the diffusion layer depth, the brittleness grade and the loose layer grade of the nitrided working surface 2-5 at the bottom of the tappet base are controlled according to the use requirements;
S7, heat treatment is carried out on the outer circular surface 1-1 of the tappet housing:
Carrying out induction quenching on the outer circumferential surface 1-1 of the tappet housing, wherein the surface hardness of the outer circumferential surface 1-1 of the tappet housing is not lower than 550HV10 by the induction quenching, the depth of a hardening layer is not lower than 0.5mm, and carrying out low-temperature tempering on the tappet by a box tempering furnace after the induction quenching;
S8, finish grinding the outer circular surface 1-1 of the tappet housing:
And (3) carrying out finish grinding processing on the outer circumferential surface 1-1 of the tappet housing after heat treatment, and controlling the diameter, roughness and cylindricity of the outer circumferential surface 1-1 of the housing according to the use requirement. The tappet with marking requirement can be subjected to marking operation after the outer circular surface 1-1 of the shell is finely ground.
In the step S4, the hardness of the tappet seat after quenching is 52-58HRC.
In the step S4, the low-temperature tempering temperature is 200-220 ℃, the stress relief temperature is 600-700 ℃, and the hardness of the annealed tappet seat 2 is more than 48 HRC.
In the step S1, the steel pipe is made of 45 steel or 40Cr material.
In the step S1, the copper wire is selected from HL105, S225 or T2 brand copper wires.
In the step S1, the bar stock made of the X210CrW material is selected.
In the step S7, the low-temperature tempering temperature is 120-200 ℃, and the tempering time is controlled to be 40 minutes to 1.5 hours.
The invention adopts the plug-in welding structure and the process, has simple and reliable structure, simple processing process and better welding performance, and can greatly reduce the material cost because the plug-in welding shell can adopt the materials such as 45 # steel or 40Cr and the like with relatively low price and the base adopts the X210CrW12 material.
The above-described embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (7)
1. The production process of the plug-in tappet welding structure comprises a shell (1) and a base (2), wherein a pair of oil holes (1-3) are transversely formed in the shell (1), ball socket working surfaces (2-4) are formed in the base (2), the bottom surface of the base (2) is a base bottom working surface (2-5), and the production process is characterized in that an inner cavity of the shell (1) is spliced with the upper part of the base (2), a welding gap L is reserved between the inner cavity of the shell (1) and the upper part of the base (2), a circle of arc-shaped base step surfaces (2-3) are formed in the top end of the upper part of the base (2), and a circle of copper ring welding wires (3-1) are arranged in the base step surfaces (2-3); the bottom of the inner cavity of the shell (1) is provided with a bevel chamfer for positioning, the bottom of the joint of the upper part of the base (2) on the base (2) is correspondingly provided with a circle of base bevel (2-2), and the bevel chamfer is consistent with the bevel angle of the base bevel (2-2); the inner diameter of the inner cavity of the shell (1) is 0.1mm larger than the outer diameter of the joint of the upper part of the base (2); the method is characterized by comprising the following steps:
S1, blanking: in the blanking stage, a steel pipe is selected as a blank making raw material of the shell (1), a copper wire is selected as a blank making raw material of the copper ring welding wire (3-1), and a bar is selected as a blank making raw material of the base (2);
S2, turning and winding the sub-parts: turning an outer circular surface (1-1) of a shell, an inner circular surface (1-2) of the shell matched with the outer circular surface (2-1) of a base, a positioning surface (1-4) of the shell and the base matched with the inclined surface (2-2) of the base and an upper end surface and a lower end surface (1-5) of the shell under the blank making raw material of the shell (1), and processing an oil hole (1-3) by using a punching or drilling and milling method if the tappet is required;
Turning a base outer circular surface (2-1) matched with the shell inner circular surface (1-2), a base inclined surface (2-2) matched with the base positioning surface (1-4), a base step surface (2-3) for placing a copper ring welding wire (3-1), a ball socket working surface (2-4) and upper and lower end surfaces of the base under the blank making raw material of the base (2);
winding a copper wire into a copper ring by using a ring winding machine under the blank making raw material of the copper ring welding wire, and cutting off to form a copper ring welding wire (3-1);
S3, assembling the sub-parts before welding:
placing a copper ring welding wire (3-1) on a base step surface (2-3) of a base (2), and then inserting the base (2) and the copper ring welding wire (3-1) into a shell (1) together until an inclined chamfer at the bottom of an inner cavity of the shell (1) presses a base inclined surface (2-2);
S4, welding and heat treatment:
Putting the assembled tappet into a mesh belt furnace for welding, wherein the welding temperature is between 850 and 1100 ℃, the base (2) is quenched at the same time, in the welding process, a copper ring welding wire is heated and melted and flows into an annular welding gap L reserved between the inner cavity of the shell and the outer circular surface (2-1) of the base, and copper which is cooled and resolidified forms a welding seam (3-2) to weld the shell (1) and the base (2) into a whole; and carrying out low-temperature tempering and stress relief annealing on the base;
S5, grinding the tappet:
grinding a reference surface of the outer circular surface (1-1) of the tappet housing by a centerless grinding or cutting grinding mode after heat treatment, then clamping the reference surface of the outer circular surface (1-1) of the housing to grind a working surface (2-5) at the bottom of the tappet base, and controlling the roughness, convexity and runout of the working surface (2-5) at the bottom of the tappet base according to the use requirement;
s6, nitriding treatment is carried out on the working surface (2-5) at the bottom of the tappet base:
Performing nitriding treatment after grinding the working surface (2-5) at the bottom of the tappet base, and controlling the surface hardness, the white layer depth, the diffusion layer depth, the brittleness level and the loose layer level of the nitrided working surface (2-5) at the bottom of the tappet base according to the use requirements;
s7, heat treatment is carried out on the outer circular surface (1-1) of the tappet housing:
carrying out induction quenching on the outer circumferential surface (1-1) of the tappet housing, wherein the surface hardness of the outer circumferential surface (1-1) of the tappet housing is not lower than 550HV10 by the induction quenching, the depth of a hardening layer is not lower than 0.5mm, and carrying out low-temperature tempering on the tappet by a box-type tempering furnace after the induction quenching;
S8, finish grinding the outer circular surface (1-1) of the tappet housing:
and (3) carrying out finish grinding processing on the outer circumferential surface (1-1) of the tappet housing after heat treatment, and controlling the diameter, roughness and cylindricity of the outer circumferential surface (1-1) of the housing according to the use requirement.
2. The process for producing a welded structure of a lifter according to claim 1, wherein in step S4, the hardness of the base of the lifter after quenching is 52-58HRC.
3. The process for manufacturing an insert-type tappet welding structure according to claim 1, wherein in step S4, the low-temperature tempering temperature is 200-220 ℃, the stress relief temperature is 600-700 ℃, and the hardness of the annealed tappet seat (2) is 48HRC or more.
4. The process for producing a welded structure of a lifter according to claim 1, wherein in the step S1, the steel pipe is 45 steel or 40Cr steel pipe.
5. The process for producing a welded structure of a plug-in tappet according to claim 1, wherein in the step S1, the copper wire is selected from HL105, S225 and T2 brand copper wires.
6. The process for producing a welded structure of a plug-in tappet according to claim 1, wherein in step S1, the bar is selected from the group consisting of bars of X210CrW material.
7. The process for producing a welded structure of a lifter according to claim 1, wherein in step S7, the low temperature tempering temperature is 120-200 ℃, and the tempering time is controlled to be 40 minutes to 1.5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210635381.5A CN114893271B (en) | 2022-06-07 | 2022-06-07 | Production process of plug-in tappet welding structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210635381.5A CN114893271B (en) | 2022-06-07 | 2022-06-07 | Production process of plug-in tappet welding structure |
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| CN114893271A CN114893271A (en) | 2022-08-12 |
| CN114893271B true CN114893271B (en) | 2024-04-19 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2526656A1 (en) * | 1975-06-14 | 1976-12-23 | Wizemann & Co J | Valve rod for IC engine - has hollow shaft electron welded to base of harder material |
| US4790473A (en) * | 1986-10-29 | 1988-12-13 | Eaton Corporation | Process for welding a cast iron wear member to a cam follower |
| JPH0315610A (en) * | 1989-08-31 | 1991-01-24 | Riken Corp | Tappet material and manufacture of tappet |
| JPH04103809A (en) * | 1990-08-24 | 1992-04-06 | Ngk Spark Plug Co Ltd | Manufacture for tappet |
| US5400951A (en) * | 1993-08-31 | 1995-03-28 | Showa Aluminum Corporation | Method of brazing a joint portion of an intake manifold with preplaced brazing |
| CN105889059A (en) * | 2016-05-31 | 2016-08-24 | 宁波派锐森液压有限公司 | Hollow plunger and machining technology thereof |
| CN109642530A (en) * | 2016-08-05 | 2019-04-16 | 臼井国际产业株式会社 | End cap |
-
2022
- 2022-06-07 CN CN202210635381.5A patent/CN114893271B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2526656A1 (en) * | 1975-06-14 | 1976-12-23 | Wizemann & Co J | Valve rod for IC engine - has hollow shaft electron welded to base of harder material |
| US4790473A (en) * | 1986-10-29 | 1988-12-13 | Eaton Corporation | Process for welding a cast iron wear member to a cam follower |
| JPH0315610A (en) * | 1989-08-31 | 1991-01-24 | Riken Corp | Tappet material and manufacture of tappet |
| JPH04103809A (en) * | 1990-08-24 | 1992-04-06 | Ngk Spark Plug Co Ltd | Manufacture for tappet |
| US5400951A (en) * | 1993-08-31 | 1995-03-28 | Showa Aluminum Corporation | Method of brazing a joint portion of an intake manifold with preplaced brazing |
| CN105889059A (en) * | 2016-05-31 | 2016-08-24 | 宁波派锐森液压有限公司 | Hollow plunger and machining technology thereof |
| CN109642530A (en) * | 2016-08-05 | 2019-04-16 | 臼井国际产业株式会社 | End cap |
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| Publication number | Publication date |
|---|---|
| CN114893271A (en) | 2022-08-12 |
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