CN112251590A - Tool for preventing crankshaft connecting rod shaft neck lightening hole medium frequency quenching cracks and using method - Google Patents

Tool for preventing crankshaft connecting rod shaft neck lightening hole medium frequency quenching cracks and using method Download PDF

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Publication number
CN112251590A
CN112251590A CN202011110359.6A CN202011110359A CN112251590A CN 112251590 A CN112251590 A CN 112251590A CN 202011110359 A CN202011110359 A CN 202011110359A CN 112251590 A CN112251590 A CN 112251590A
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CN
China
Prior art keywords
connecting rod
lower cover
upper cover
holes
tool
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011110359.6A
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Chinese (zh)
Inventor
赵德
孙献凯
金文玉
郝敬
姚旭
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Henan Diesel Engine Industry Co Ltd
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Henan Diesel Engine Industry Co Ltd
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Publication date
Application filed by Henan Diesel Engine Industry Co Ltd filed Critical Henan Diesel Engine Industry Co Ltd
Priority to CN202011110359.6A priority Critical patent/CN112251590A/en
Publication of CN112251590A publication Critical patent/CN112251590A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

The invention discloses a crankshaft connecting rod journal lightening hole intermediate frequency quenching crack prevention tool and a use method thereof, the tool comprises an upper cover and a lower cover, the lower cover adopts a frustum structure, through holes for penetrating iron wires are respectively arranged on the upper cover and the lower cover, the number of the through holes of the upper cover and the lower cover is two, the through holes of the upper cover and the lower cover are arranged in a one-to-one correspondence manner, the crankshaft connecting rod journal lightening hole intermediate frequency quenching crack prevention tool and the use method thereof fill lightening holes of a crankshaft connecting rod journal through the device, so that the uneven thin wall condition of the connecting rod journal is improved, in the intermediate frequency heating process of the connecting rod journal, heat is transferred through a plug contacted with the lightening holes, the heat concentration of the thin wall part is reduced, the risk of cracks in the quenching cooling process is effectively reduced, the yield of products is improved, and simultaneously, the plug bodies can be suitable for different apertures under the action of the lower cover and the upper cover, the application range is improved.

Description

Tool for preventing crankshaft connecting rod shaft neck lightening hole medium frequency quenching cracks and using method
Technical Field
The invention relates to the technical field of surface heat treatment, in particular to a tool for preventing cracking of a crankshaft connecting rod journal lightening hole in medium frequency quenching and a using method thereof.
Background
The medium frequency quenching is that a metal piece is placed in an induction coil, alternating current is conducted through the induction coil to generate an alternating magnetic field, and alternating current is induced in the metal piece. The intermediate frequency quenching is a common crankshaft strengthening mode, if a connecting rod journal lightening hole is machined after the crankshaft is subjected to intermediate frequency, machining allowance is large, deformation is easy to occur, the hardness of the surface, close to the journal, of the lightening hole is inconsistent with the hardness of a matrix, and machining precision is difficult to guarantee; if a lightening hole of a connecting rod journal is machined before the crankshaft is subjected to intermediate frequency, the connecting rod journal is provided with an uneven thin wall, risks exist during intermediate frequency quenching of the crankshaft, and if cracks occur, parts are directly scrapped, and huge loss is caused.
Disclosure of Invention
The invention aims to overcome the existing defects and provides a tool for preventing cracking of a crankshaft connecting rod journal in medium frequency quenching in a lightening hole and a using method thereof, which can improve the condition of uneven thin wall of the connecting rod journal, reduce the risk of cracking in the quenching cooling process and effectively solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the tool comprises an upper cover and a lower cover, wherein a blocking body is arranged on one side of the upper cover, the upper cover is connected with the blocking body through a large tensioning bolt, the lower cover is arranged on one side of the blocking body, and the blocking body is connected with the lower cover through a small tensioning bolt.
As a preferable technical scheme of the invention, through holes for penetrating iron wires are arranged on the upper cover and the lower cover.
As a preferred technical scheme of the invention, the number of the through holes of the upper cover and the lower cover is two, and the through holes of the upper cover and the through holes of the lower cover are arranged in a one-to-one correspondence manner.
As a preferable technical scheme of the invention, the lower cover adopts a frustum structure.
As a preferred technical scheme of the invention, the number of the blocking bodies is two, and the gaps of the blocking bodies are matched with the large tensioning bolts.
As a preferred technical scheme of the invention, the plug body is provided with a through hole for penetrating an iron wire, and a threaded hole is arranged near one side of the through hole for penetrating the iron wire.
As a preferred technical scheme of the invention, the threaded hole on the plug body is matched with the small tension bolt.
A use method of a tool for preventing a crankshaft connecting rod shaft neck lightening hole from medium frequency quenching cracks comprises the following steps:
s1: the large tension bolt and the small tension bolt are properly screwed, and the device is plugged into the crankshaft lightening hole;
s2: sequentially screwing the large tensioning bolt and the small tensioning bolt by using a spanner, and extruding the upper cover and the lower cover to open the plugging body until the plugging body is tightly abutted to the lightening hole;
s3: and (3) sequentially penetrating the upper cover, the lower cover and the plug body by using iron wires, and tensioning the iron wires.
Compared with the prior art, the invention has the beneficial effects that: according to the tool for preventing the crankshaft connecting rod shaft neck lightening holes from cracking during medium-frequency quenching and the using method thereof, the lightening holes of the crankshaft connecting rod shaft neck are filled by the device, so that the condition of uneven thin walls of the connecting rod shaft neck is improved, heat is transferred through the plugs in contact with the lightening holes during medium-frequency heating of the connecting rod shaft neck, heat concentration of the thin-wall part is reduced, the risk of cracking during quenching and cooling is effectively reduced, the yield of products is improved, and meanwhile, the plug bodies can be suitable for different apertures under the action of the lower cover and the upper cover, so that the using range is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the upper cover;
fig. 3 is a bottom view of the plug body;
fig. 4 is a front view of the plug body;
FIG. 5 is a schematic view of the lower cover;
fig. 6 is a flow chart of the operation.
In the figure: 1 upper cover, 2 closure bodies, 3 lower covers, 4 large tension bolts and 5 small tension bolts.
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, but not all of the embodiments (for convenience of description and understanding, the upper side of fig. 1 is described as the upper side below). 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.
Embodiment 1, a tool for preventing cracks in a lightening hole of a crankshaft connecting rod journal through intermediate frequency quenching, comprising an upper cover 1 and a lower cover 3, wherein the upper cover 1 and the lower cover 3 are both provided with through holes for passing iron wires, the lower cover 3 adopts a frustum structure for supporting a plug body 2, the number of the through holes of the upper cover 1 and the lower cover 3 is two, the through holes of the upper cover 1 and the lower cover 3 are arranged in a one-to-one correspondence manner, the iron wires pass through the upper cover 1, the lower cover 3 and the plug body 2 and are tightened to prevent the plug from falling out of the lightening hole in the intermediate frequency quenching process, one side of the upper cover 1 is provided with the plug body 2, the upper cover 1 is connected with the plug body 2 through a large tightening bolt 4, one side of the plug body 2 is provided with the lower cover 3, the plug body 2 is connected with the lower cover 3 through a small tightening bolt 5, the number of the plug body 2 is two, and the gap of the plug body 2 is matched with the large tightening bolt 4, the through-hole of iron wire is worn to be provided with on the closure body 2, near through-hole one side of wearing the iron wire is provided with the screw hole, screw hole on the closure body 2 cooperatees with little tie bolt 5, and the device can effectively reduce the risk that crackle appears in the quenching cooling process, can improve the inhomogeneous thin wall condition of connecting rod axle journal, improves the practicality of use greatly.
The tool comprises the following steps in the using process:
s1: the large tension bolt 4 and the small tension bolt 5 are properly screwed, and the device is plugged into a crankshaft lightening hole with the aperture of 25 mm;
s2: sequentially screwing the large tensioning bolt 4 and the small tensioning bolt 5 by using a spanner, so that the upper cover 1 and the lower cover 3 are extruded to open the plug body 2 until the plug body 2 is tightly arranged with the lightening hole with the aperture of 25 mm;
s3: and (3) sequentially penetrating the upper cover 1, the lower cover 3 and the plug body 2 by using iron wires, and tensioning the iron wires.
Embodiment 2, a tool for preventing cracks in a lightening hole of a crankshaft connecting rod journal through intermediate frequency quenching, comprising an upper cover 1 and a lower cover 3, wherein the upper cover 1 and the lower cover 3 are both provided with through holes for passing iron wires, the lower cover 3 adopts a frustum structure for supporting a plug body 2, the number of the through holes of the upper cover 1 and the lower cover 3 is two, the through holes of the upper cover 1 and the lower cover 3 are arranged in a one-to-one correspondence manner, the iron wires pass through the upper cover 1, the lower cover 3 and the plug body 2 and are tightened to prevent the plug from falling out of the lightening hole in the intermediate frequency quenching process, one side of the upper cover 1 is provided with the plug body 2, the upper cover 1 is connected with the plug body 2 through a large tightening bolt 4, one side of the plug body 2 is provided with the lower cover 3, the plug body 2 is connected with the lower cover 3 through a small tightening bolt 5, the number of the plug body 2 is two, and the gap of the plug body 2 is matched with the large tightening bolt 4, the through-hole of iron wire is worn to be provided with on the closure body 2, near through-hole one side of wearing the iron wire is provided with the screw hole, screw hole on the closure body 2 cooperatees with little tie bolt 5, and the device can effectively reduce the risk that crackle appears in the quenching cooling process, can improve the inhomogeneous thin wall condition of connecting rod axle journal, improves the practicality of use greatly.
The tool comprises the following steps in the using process:
s1: the large tension bolt 4 and the small tension bolt 5 are properly screwed, and the device is plugged into a crankshaft lightening hole with the aperture of 30 mm;
s2: sequentially screwing the large tensioning bolt 4 and the small tensioning bolt 5 by using a spanner, so that the upper cover 1 and the lower cover 3 are extruded to open the plug body 2 until the plug body 2 is tightly arranged with the lightening hole with the aperture of 30 mm;
s3: and (3) sequentially penetrating the upper cover 1, the lower cover 3 and the plug body 2 by using iron wires, and tensioning the iron wires.
The tool is used for filling lightening holes of the crankshaft connecting rod journal, the uneven thin-wall condition of the connecting rod journal is greatly improved, meanwhile, heat is transferred through the plug contacted with the lightening holes, the heat concentration of the thin-wall part is reduced, the risk of cracks in the quenching and cooling process is effectively reduced, the device can improve the strength of the crankshaft, the condition that the connecting rod journal is broken due to insufficient strength is avoided, and the yield of products is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. The utility model provides a prevent crankshaft connecting rod axle journal lightening hole intermediate frequency quenching crackle frock, includes upper cover (1) and lower cover (3), its characterized in that: one side of upper cover (1) is provided with closure body (2), is connected through big tie bolt (4) between upper cover (1) and the closure body (2), one side of closure body (2) is provided with lower cover (3), and closure body (2) are connected through little tie bolt (5) with lower cover (3).
2. The tool for preventing the mid-frequency quenching cracks of the lightening holes of the crankshaft connecting rod shaft neck as claimed in claim 1, is characterized in that: the upper cover (1) and the lower cover (3) are provided with through holes for penetrating iron wires.
3. The tool for preventing the mid-frequency quenching cracks of the lightening holes of the crankshaft connecting rod shaft neck as claimed in claim 2, is characterized in that: the number of the through holes of the upper cover (1) and the lower cover (3) is two, and the through holes of the upper cover (1) and the lower cover (3) are arranged in a one-to-one correspondence manner.
4. The tool for preventing the mid-frequency quenching cracks of the lightening holes of the crankshaft connecting rod journal as claimed in claim 1, is characterized in that: the lower cover (3) adopts a frustum structure.
5. The tool for preventing the mid-frequency quenching cracks of the lightening holes of the crankshaft connecting rod journal as claimed in claim 1, is characterized in that: the number of the blocking bodies (2) is two, and the openings of the blocking bodies (2) are matched with the large tensioning bolts (4).
6. The tool for preventing the mid-frequency quenching cracks of the lightening holes of the crankshaft connecting rod journal as claimed in claim 1, is characterized in that: be provided with the through-hole of wearing the iron wire on the closure body (2), near through-hole one side of wearing the iron wire is provided with the screw hole.
7. The tool for preventing the mid-frequency quenching cracks of the lightening holes of the crankshaft connecting rod shaft neck as claimed in claim 6, is characterized in that: and the threaded hole on the blocking body (2) is matched with the small tension bolt (5).
8. A use method of a tool for preventing cracking of a crankshaft connecting rod journal lightening hole in medium frequency quenching is characterized by comprising the following steps:
s1: the large tension bolt (4) and the small tension bolt (5) are properly screwed, and the device is plugged into a crankshaft lightening hole;
s2: sequentially screwing the large tensioning bolt (4) and the small tensioning bolt (5) by using a spanner, so that the upper cover (1) and the lower cover (3) are extruded to open the plugging body (2) until the plugging body (2) is tightly abutted to the lightening hole;
s3: iron wires sequentially penetrate through the upper cover (1), the lower cover (3) and the blocking body (2) and are tensioned.
CN202011110359.6A 2020-10-16 2020-10-16 Tool for preventing crankshaft connecting rod shaft neck lightening hole medium frequency quenching cracks and using method Pending CN112251590A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011110359.6A CN112251590A (en) 2020-10-16 2020-10-16 Tool for preventing crankshaft connecting rod shaft neck lightening hole medium frequency quenching cracks and using method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011110359.6A CN112251590A (en) 2020-10-16 2020-10-16 Tool for preventing crankshaft connecting rod shaft neck lightening hole medium frequency quenching cracks and using method

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Publication Number Publication Date
CN112251590A true CN112251590A (en) 2021-01-22

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CN202011110359.6A Pending CN112251590A (en) 2020-10-16 2020-10-16 Tool for preventing crankshaft connecting rod shaft neck lightening hole medium frequency quenching cracks and using method

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59190317A (en) * 1983-04-12 1984-10-29 Fuji Heavy Ind Ltd High frequency hardening method
CN101942550A (en) * 2010-09-06 2011-01-12 中原特钢股份有限公司 Heat treatment process for hollow drill collar
CN103834883A (en) * 2012-11-20 2014-06-04 北京航星机器制造公司 Heat treatment deformation control method of thin-wall saddle-shaped aluminum alloy casting
CN205999422U (en) * 2016-08-31 2017-03-08 马鞍山市恒泰重工机械有限公司 A kind of gland seal Quenching Treatment device
CN206545753U (en) * 2017-03-06 2017-10-10 常州港华燃气有限公司 A kind of combined pipeline plug
CN109957638A (en) * 2019-03-06 2019-07-02 上海交通大学 A kind of method that the horizontal water quenching of shaft forgings with holes avoids inner hole from cracking
CN111304412A (en) * 2020-03-04 2020-06-19 中国重汽集团济南动力有限公司 Induction quenching process of inflation and deflation shaft head

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59190317A (en) * 1983-04-12 1984-10-29 Fuji Heavy Ind Ltd High frequency hardening method
CN101942550A (en) * 2010-09-06 2011-01-12 中原特钢股份有限公司 Heat treatment process for hollow drill collar
CN103834883A (en) * 2012-11-20 2014-06-04 北京航星机器制造公司 Heat treatment deformation control method of thin-wall saddle-shaped aluminum alloy casting
CN205999422U (en) * 2016-08-31 2017-03-08 马鞍山市恒泰重工机械有限公司 A kind of gland seal Quenching Treatment device
CN206545753U (en) * 2017-03-06 2017-10-10 常州港华燃气有限公司 A kind of combined pipeline plug
CN109957638A (en) * 2019-03-06 2019-07-02 上海交通大学 A kind of method that the horizontal water quenching of shaft forgings with holes avoids inner hole from cracking
CN111304412A (en) * 2020-03-04 2020-06-19 中国重汽集团济南动力有限公司 Induction quenching process of inflation and deflation shaft head

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
江国清等: "零件结构或表面质量等因素导致的淬火裂纹", 《金属加工(热加工)》 *
王仕杰等: "曲轴油孔感应淬火裂纹产生原因分析及防止措施", 《金属热处理》 *

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Application publication date: 20210122

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