CN106755910B - A kind of torsion bar shaft end thread hole is heat-treated anti-oxidation method - Google Patents
A kind of torsion bar shaft end thread hole is heat-treated anti-oxidation method Download PDFInfo
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- CN106755910B CN106755910B CN201710206734.9A CN201710206734A CN106755910B CN 106755910 B CN106755910 B CN 106755910B CN 201710206734 A CN201710206734 A CN 201710206734A CN 106755910 B CN106755910 B CN 106755910B
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- threaded hole
- torsion bar
- heat treatment
- high temperature
- bar shaft
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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
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Reinforcement Elements For Buildings (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A kind of torsion bar shaft end thread hole is heat-treated anti-oxidation method, with the tap tapping smaller than conventional criteria screw tap size before torsion bar shaft heat treatment, stays some allowances for finish so as to after heat treatment being capable of refine screw thread pore size;Sealing medium resistant to high temperature is filled up in threaded hole, high temperature resistant plug is inserted into threaded hole, plug can squeeze into the medium in hole at thread gaps when being inserted into threaded hole, play the role of sealing;Torsion bar shaft heat treatment, takes out plug after the completion, squeezes out medium, and refine screw thread pore size makes screw thread pore size meet technical requirements.The present invention does not process disposably in place before threaded hole heat treatment; stay some refine surpluses; can prevent deformed threads or other errors influences the precision of screw thread; during heat treatment; in the case where heated; graphited oil can expand so that thread pitch more seals, and especially graphited oil has good oxidation resistance in pyroprocess, plays the not oxidized effect of protection screw thread body.
Description
Technical field
The present invention relates in a kind of threaded hole anti-oxidation method, especially a kind of torsion bar shaft end thread hole heat treatment process
Anti-oxidation method, belong to metal working process technical field.
Background technique
Current orbit vehicle anti-side rolling torsion rod axis end for antirust, dust-proof, anti-collide with, it will usually additional designs peace
A dust cover is filled, dust cover needs to bore by being threadably mounted at torsion bar shaft end, therefore in torsion bar shaft several M6 or M8 screw threads
Hole.Since torsion bar shaft heat treatment hardness used for rail vehicle requires relatively high, general hardness routine after 50HRC or so, heat treatment
Processing method do not process the threaded hole, threaded hole can only be drilled before heat treatment, after heat treatment return one of screw thread, but by
Long-time before quenching is kept the temperature at 900 DEG C or so, so that helicitic texture is oxidized seriously by part, heat treatment is caused to terminate
Afterwards, by returning the threaded hole of screw thread silk, screw thread is detected using logical, no-go gage, it is qualified that a large amount of threaded hole cannot be detected by no-go gage.Through
After crossing the oxidation of analysis threaded hole, it has been more than no-go gage arrowhead that the pitch diameter of thread, which becomes larger, and the torsion bar shaft for causing value expensive is because small
Small threaded hole dimension overproof and scrap, to manufacturing enterprise bring weight huge economic loss.Therefore, it is necessary to one kind to be heat-treated
Be protected to threaded hole the method for its oxidation in the process to reduce because screw thread is unqualified but probability that torsion bar shaft is scrapped,
Reduce the economic loss of manufacturing enterprise.
By retrieving to domestic patent, discovery has the patent in terms of being protected to threaded hole, is exemplified below:
1. number of patent application CN200810238393.4, entitled " a kind of metal component screwed hole is at galvanizing anti-corrosion
The patent of invention of guard method in reason " discloses a kind of protection side of metal component screwed hole in galvanizing preservative treatment
Method, it mainly comprises the steps that the first step, prepares mastic, land plaster is poured into container, according to volume ratio land plaster: water
=3-4: 1 pours into water, stirs;Described mastic is packed into the to be protected of metal parts with iron plate by second step
In threaded hole, dense extrusion after filling;The metal parts of above-mentioned populated mastic is made galvanizing preservative treatment by third step;The
Four steps, mastic is taken out, and cleans out threaded hole.Guard method provided by the invention can make metal part surface make heat
During soaking zinc preservative treatment, do not increase the thickness of metal component screwed hole zinc-impregnating layer, avoids thread mill drilling due to increasing
The thickness of zinc-impregnating layer is added to cause can not to install or other problems, it is ensured that metal parts soaks the matter of the screw thread of preprocessing after zinc
Amount, this method is simple and easy, is greatly improved labor efficiency.
2. number of patent application CN201620710358.8, entitled " screw thread of the Al alloy parts in anode oxidation process
The utility model patent of hole protection plug " discloses a kind of threaded hole protection plug of Al alloy parts in anode oxidation process, packet
Flexible protection plug, the shape that protection plug matches in the threaded hole with Al alloy parts are included, protection plug has upper opening
Inner hole, protection plug is divided into two sections up and down, and wherein upper section is the extension diameter section to offset that is open with the threaded holes of Al alloy parts, lower section
For inserting paragraph, in smooth cylinder, the outer diameter of lower section is not less than the bottom diameter of threaded hole, when needing to protect threaded hole
When, it is inserted into the inner hole of protection plug after stretching the lower section of protection plug and is inserted into threaded hole by matched pole, extract pole,
Protection is squeezed into shape of threads after getting back into spring-go position and threaded hole seals.The utility model is simple and reasonable, good seal performance, makes
With convenient, preferable protective effect can be played to threaded hole, and it is reusable, cost is relatively low.
Threaded hole is protected by smearing gypsum in threaded hole in above-mentioned patent 1, since gypsum is sintered at high temperature
After can the contraction distortion due to dehydration, be easy cracking, collapse out, therefore not can solve the oxidation protection of threaded hole at high temperature and ask
Topic.With protection plug insertion threaded hole in patent 2, threaded hole can only be protected not to be blocked, but still threaded hole cannot be protected not by oxygen
Change.Therefore it still needs to improve.
Summary of the invention
The present invention is that solution causes when preceding pitch diameter of thread due to causing threaded hole oxidation in torsion bar shaft heat treatment process becomes larger
The problem of torsion bar shaft is scrapped proposes the anti-oxidation method in a kind of heat treatment process of torsion bar shaft end thread hole, reduces torsion bar
The scrappage of axis reduces the economic loss of enterprise.
The present invention in order to solve the above problem used by technological means are as follows: a kind of torsion bar shaft end thread hole be heat-treated oxygen
Change method fills up sealing medium resistant to high temperature in threaded hole, before being heat-treated after torsion bar shaft threaded hole into threaded hole
It is inserted into high temperature resistant plug, high temperature resistant plug can squeeze into the medium in hole at thread gaps when being inserted into threaded hole, play sealing
Effect, while high temperature resistant plug blocks threaded hole, prevents sealing medium resistant to high temperature from dropping out out of threaded hole;Torsion bar shaft
Heat treatment takes out high temperature resistant plug after the completion, squeezes out sealing medium resistant to high temperature, refine screw thread pore size makes screw thread pore size
Meet technical requirements.
Further, sealing medium resistant to high temperature is graphited oil, during heat treatment, it is heated in the case where, stone
Black lubricating grease can expand so that thread pitch more seals, and graphited oil has anti-oxidant well especially in pyroprocess
Ability, while graphited oil includes graphite material, can be consumed by complete or unburnt mode and enter screw thread
Oxygen in gap or threaded hole and to play protection screw thread body not oxidized, and due to graphite have good high-temperature stability and
Lubrication property will not be sintered between high temperature resistant plug and the body of rod at high temperature, be easy to take out on high temperature resistant plug.
Further, sealing medium resistant to high temperature be high-temperature resistant coating, including high temperature organosilicon paint and inorganic silicon it is resistance to
High-temperature coatings.
Further, high temperature resistant plug is the screw of same specification and model, screws in 1/3-2/5 threaded hole, both that threaded hole is close
Blocking prevents from being oxidized in heat treatment process, and conveniently after heat treatment takes out screw.
Further, high temperature resistant plug is the small rotary table in the big one end in one end made of heat-resisting material, from small end 1/3-
Diameter of section at 1/5 is equal sized with heat treatment preceding thread hole.
Further, some finishing are stayed with the tap tapping smaller than conventional criteria screw tap size before torsion bar shaft heat treatment
Surplus is so as to after heat treatment being capable of refine screw thread pore size.
Further, the screw tap size of tapping 1-2 model smaller than conventional criteria screw tap.
Further, refine is carried out using size of the die hob to threaded hole after heat treatment, guarantees that screw thread pore size is full
Sufficient technical requirements.
The beneficial effects of the present invention are:
1. the present invention fills in threaded hole and is inserted into high temperature resistant plug after medium, high temperature resistant plug is by extra a part
Sealing medium resistant to high temperature is squeezed at thread gaps, plays the role of sealing, while high temperature resistant plug blocks threaded hole,
Prevent sealing medium resistant to high temperature from dropping out out of threaded hole.
2. the present invention during heat treatment, be heated in the case where, graphited oil can expand so that thread pitch more
Encryption envelope, graphited oil has good oxidation resistance, while graphitiferous material in graphited oil especially in pyroprocess
Material, can consume the oxygen entered in thread gaps or threaded hole by complete or unburnt mode and play protection
The not oxidized effect of screw thread body.
3. the present invention does not process disposably in place before threaded hole heat treatment, some refine surpluses are stayed, screw thread can be prevented
Deformation or other errors influence the precision of screw thread.
4. the present invention removes high temperature resistant plug after the completion of heat treatment, using die hob refine thread size, guarantee spiral shell
Line size meets technical requirements, and reducing leads to entire scrap of the product since threaded hole aoxidizes.
Detailed description of the invention
Fig. 1 is torsion bar shaft end thread pore structure schematic diagram of the present invention;
Fig. 2 is the anti-oxidation schematic diagram of threaded hole of the present invention;
Wherein: 1. torsion bar shafts, 2. sealing mediums resistant to high temperature, 3. high temperature resistant plugs, 4. threaded holes.
Specific embodiment
The following further describes the present invention with reference to the drawings.
Embodiment one
As Figure 1-Figure 2, a kind of torsion bar shaft is heat-treated the guard method of threaded hole, heat after 1 threaded hole of torsion bar shaft
Before processing, sealing medium 2 resistant to high temperature is filled up in threaded hole 4, high temperature resistant plug 3 is inserted into threaded hole 4, plug 3 is inserted into
The medium 2 in hole can be squeezed at thread gaps when threaded hole 4, play the role of sealing;Torsion bar shaft 1 is heat-treated, and is taken after the completion
High temperature resistant plug 3 out, squeezes out sealing medium 2 resistant to high temperature, and 4 size of refine threaded hole makes 4 size of threaded hole meet technology and wants
It asks.
Further, sealing medium 2 resistant to high temperature is graphited oil, is moistened graphite using syringe or butter oil syringe
Consistent lubricant fills threaded hole 4, during heat treatment, it is heated in the case where, graphited oil can expand so that thread pitch more
Encryption envelope, graphited oil has good oxidation resistance, while graphitiferous material in graphited oil especially in pyroprocess
Material, can consume the oxygen entered in thread gaps or threaded hole by complete or unburnt mode and play protection
Screw thread body is not oxidized, and since graphite has good high-temperature stability and lubrication property, at high temperature plug and the body of rod it
Between will not be sintered, be easy plug is taken out.
Further, high temperature resistant plug 3 is the screw of model M8, screws in 1/3 threaded hole, and screw is by extra a part
Graphited oil is squeezed at thread gaps, and not only the sealing of threaded hole 4, which is blocked, prevents from being oxidized in heat treatment process, but also conveniently in heat
Screw is taken out after processing.
Further, it is stayed before the heat treatment of 1 threaded hole of torsion bar shaft with the tap tapping smaller than conventional criteria screw tap size
Allowance for finish is so as to after heat treatment being capable of refine screw thread pore size.
Further, the specification of screw is M8, the screw tap model M6 of tapping before being heat-treated.
Further, screw is unscrewed after the completion of heat treatment and is removed, using the screw tap of model M8 by the stone in threaded hole 4
Black lubricating grease squeezes out, and carries out refine to the size of threaded hole 4, guarantees that 4 size of threaded hole meets technical requirements.
Embodiment two
The present embodiment principle and method are as in the first embodiment, difference is as follows:
The specification of screw is M6, the screw tap model M5 of tapping before being heat-treated.
Further, sealing medium resistant to high temperature be high-temperature resistant coating, including high temperature organosilicon paint and inorganic silicon it is resistance to
High-temperature coatings.
High temperature resistant plug is the small rotary table in the big one end in one end made of heat-resisting material, rotary table from small end 1/3-1/5 at
Diameter of section with heat treatment preceding thread hole 4 it is equal sized.
From above-described embodiment as can be seen that the invention has the following advantages:
1. the present invention fills in threaded hole and is inserted into high temperature resistant plug after medium, high temperature resistant plug is by extra a part
Sealing medium resistant to high temperature is squeezed at thread gaps, plays the role of sealing, while high temperature resistant plug blocks threaded hole,
Prevent sealing medium resistant to high temperature from dropping out out of threaded hole.
2. the present invention during heat treatment, be heated in the case where, graphited oil can expand so that thread pitch more
Encryption envelope, graphited oil has good oxidation resistance, while graphitiferous material in graphited oil especially in pyroprocess
Material, can consume the oxygen entered in thread gaps or threaded hole by complete or unburnt mode and play protection
The not oxidized effect of screw thread body.
3. the present invention does not process disposably in place before threaded hole heat treatment, some refine surpluses are stayed, screw thread can be prevented
Deformation or other errors influence the precision of screw thread.
4. the present invention removes high temperature resistant plug after the completion of heat treatment, using die hob refine thread size, guarantee spiral shell
Line size meets technical requirements, and reducing leads to entire scrap of the product since threaded hole aoxidizes.
Claims (4)
1. a kind of torsion bar shaft end thread hole is heat-treated anti-oxidation method, it is characterised in that: after torsion bar shaft threaded hole at heat
Before reason, sealing medium resistant to high temperature is filled up in threaded hole, high temperature resistant plug is inserted into threaded hole, when plug is inserted into threaded hole
Medium in hole can be squeezed at thread gaps, play the role of sealing;Torsion bar shaft heat treatment, takes out high temperature resistant plug after the completion
Son, squeezes out sealing medium resistant to high temperature, and refine screw thread pore size makes screw thread pore size meet technical requirements;
The sealing medium resistant to high temperature is graphited oil or high-temperature resistant coating, and the high-temperature resistant coating includes the resistance to height of organosilicon
Thermo-paint and inorganic silicon high-temperature resistant coating;
The high temperature resistant plug is the screw of same specification and model, screws in 1/3-2/5 threaded hole, and both threaded hole sealing, which is blocked, prevents
It is oxidized in heat treatment process, and conveniently after heat treatment takes out screw.
2. torsion bar shaft end thread as described in claim 1 hole is heat-treated anti-oxidation method, it is characterised in that: the refine spiral shell
Pit size is to carry out refine using size of the die hob to threaded hole after being heat-treated, and guarantees that screw thread pore size meets technology and wants
It asks.
3. torsion bar shaft end thread as described in claim 1 hole is heat-treated anti-oxidation method, it is characterised in that: the torsion bar shaft
With the tap tapping smaller than conventional criteria screw tap size before heat treatment, some allowances for finish are stayed so as to after heat treatment being capable of essence
Repair screw thread pore size.
4. torsion bar shaft end thread as claimed in claim 3 hole is heat-treated anti-oxidation method, it is characterised in that: the tapping
Screw tap size 1-2 model smaller than conventional criteria screw tap.
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Families Citing this family (3)
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CN108754095B (en) * | 2018-09-12 | 2020-05-29 | 上海电气核电设备有限公司 | Method for preventing threaded hole from being oxidized during heat treatment |
CN112091530B (en) * | 2020-07-24 | 2022-06-14 | 郑州沃华机械有限公司 | Pin hole processing technology of melt pump shell |
CN117867256B (en) * | 2024-03-11 | 2024-05-28 | 陕西蓝通传动轴有限公司 | Heat treatment equipment for processing transmission shaft for automobile |
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CN204113850U (en) * | 2014-07-12 | 2015-01-21 | 图腾电子设备(昆山)有限公司 | A kind of internal thread protection plug |
CN105420466A (en) * | 2015-12-02 | 2016-03-23 | 西安航天动力机械厂 | Method for protecting screw hole in heat treatment |
CN205821480U (en) * | 2016-06-30 | 2016-12-21 | 龚典局 | Al alloy parts screwed hole protection plug in anode oxidation process |
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CN200967620Y (en) * | 2006-09-19 | 2007-10-31 | 内蒙古北方重工业集团有限公司 | Axle end-face thread block |
CN101440467A (en) * | 2008-12-12 | 2009-05-27 | 南车四方车辆有限公司 | Protecting method for metal component screwed hole in hot-dip galvanizing antiseptic treatment t |
CN201558796U (en) * | 2009-11-25 | 2010-08-25 | 中国科学院上海硅酸盐研究所 | Plasma spraying protecting device for artificial acetabulum thread hole |
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CN205821480U (en) * | 2016-06-30 | 2016-12-21 | 龚典局 | Al alloy parts screwed hole protection plug in anode oxidation process |
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