CN110230023A - Metal surface salt-bath nitriding and QPQ technique - Google Patents

Metal surface salt-bath nitriding and QPQ technique Download PDF

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Publication number
CN110230023A
CN110230023A CN201811533151.8A CN201811533151A CN110230023A CN 110230023 A CN110230023 A CN 110230023A CN 201811533151 A CN201811533151 A CN 201811533151A CN 110230023 A CN110230023 A CN 110230023A
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Prior art keywords
workpiece
lid
furnace
salt
metal surface
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CN201811533151.8A
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CN110230023B (en
Inventor
赵林国
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Changde Guanghe Machinery Manufacturing Co ltd
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Taizhou Chenzhao New Material Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
    • C23C8/58—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions more than one element being applied in more than one step
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/80—After-treatment

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

The invention discloses a kind of metal surface salt-bath nitriding and QPQ techniques, including metal works to be processed, to work pieces process the following steps are included: washing workpiece using the water logging containing detergent, wash workpiece with 100 DEG C of water logging after clear water flushing；300-385 DEG C is preheated to workpiece, preheating time 6-25min；Workpiece is placed in the nitriding furnace for being placed with the salt of the base containing Li ion, increases 520-580 DEG C of nitriding furnace, nitridation time 80-100min；Sodium peroxide solid is added into base salt, and the weight ratio of solid peroxygen sodium and the weight ratio of the base salt are 1:2.5-4.5.The present invention can realize that base salt is utilized again by using sodium peroxide solid, ensure the stability of cyanate radical；Sodium ion can be ensured can be reacted in use process sodium ion with other ions in base salt, sodium carbonate be generated, to reduce the generation of sundries.

Description

Metal surface salt-bath nitriding and QPQ technique
Technical field
The invention belongs to chemical surface treatment technical fields, more particularly, to a kind of metal surface salt-bath nitriding and QPQ work Skill.
Background technique
The essence of QPQ (Quench-Polish-Quench, quenching-polishing-quenching) technology be low temperature salt-bath nitriding+ Liquid oxidizing or low temperature salt-bath nitrocarburizing+liquid oxidizing, it is a kind of metal parts process for modifying surface, have high resistance to corrosion, The advantages of high abrasion, Light deformation.Workpiece surface through QPQ technical treatment be Fe3O4 oxidation film, corrosion stability much higher than chromium plating, The level of the surface protection techniques such as nickel plating, medium carbon steel can replace stainless steel in many fields after QPQ is handled.Meanwhile QPQ work Skill can replace traditional Anticorrosion measure such as nigrescence, phosphatization and nickel plating.Currently, highly resistance corrosion possessed by QPQ technology causes The very big concern of the more serious industry of the etching problems such as related industry, especially petroleum, chemical industry.
To workpiece during processing, the CNO of base salt-CN can be consumed into-Base salt can be a large amount of during being somebody's turn to do Consumption, it is big to will cause supplies consumption amount, although in the prior art using urea as reducing agent, by CN-It is reduced into CNO-, But urea can additionally generate impurity, and raw material availability after reaction is caused to reduce.
Summary of the invention
The present invention for overcome the deficiencies in the prior art, provides that a kind of saving raw material, to reduce cost, raw material availability high Metal surface salt-bath nitriding and QPQ technique.
To achieve the goals above, the invention adopts the following technical scheme: a kind of metal surface salt-bath nitriding and QPQ work Skill, including metal works to be processed, to work pieces process the following steps are included:
1) workpiece is washed using the water logging containing detergent, washes workpiece with 100 DEG C of water logging after clear water flushing；
2) 300-385 DEG C is preheated to workpiece, preheating time 6-25min;
3) workpiece is placed in the nitriding furnace for being placed with the salt of the base containing Li ion, increases 520-580 DEG C of nitriding furnace, nitridation time is 80-100min;
4) sodium peroxide solid is added into base salt, and the weight ratio of solid peroxygen sodium and the weight ratio of the base salt are 1: 2.5-4.5；
5) after sodium peroxide solid is added, the temperature to heat up in nitriding furnace is to 520-580 DEG C, nitridation time 50-90min;
6) workpiece after nitridation is placed in the oxidation furnace containing saline oxide to carry out first time liquid oxidizing, heated oxide furnace temperature Degree is to 360-380 DEG C, oxidization time 15-20min;
7) to the workpiece polishing treatment after first time aoxidizes；
8) workpiece after polishing is subjected to second of liquid oxidizing, oxidation furnace temperature is 42-450 DEG C, oxidization time 25- 30min；
9) workpiece after completing secondary oxidation, which is placed in machine oil, to be impregnated.
The present invention is by using sodium peroxide solid, during base salt carries out nitrogen infiltration to workpiece, sodium peroxide institute Existing oxidisability can will be by CN-It is reduced into CNO-, in the whole process, ensure that stream utilizes base salt again, ensure The stability of cyanate radical；And because having sodium ion in sodium peroxide during being somebody's turn to do, sodium ion, which can ensure, to be used Journey sodium ion can be reacted with other ions in base salt, sodium carbonate be generated, to reduce the generation of sundries, therefore quilt Raw material after reaction can continue to react, and reaction efficiency is high.
Preferably, the raw material of the component ratio by weight of base salt described in step 3) includes: 3-5 parts of lithium carbonate, potassium chloride 8- 15 parts, 5-8 parts of sodium carbonate, 2-4 parts of carbonyl diamide；Utilization rate between each raw material can be effectively improved by way of the proportion, Improving can effectively be used between each raw material.
Preferably, the raw material of the component ratio by weight of saline oxide described in step 6) includes: 2-5 parts of potassium hydroxide, nitric acid 5-7 parts of 5-8 parts of sodium, 12-15 parts of sodium carbonate and four ammonium chlorides.
Preferably, after workpiece is cooled to 70-80 DEG C in step 9), then be placed in the machine oil that temperature is 20-35 DEG C and impregnate； By the way that workpiece is cooled to 70-80 DEG C, should during because the temperature of workpiece is also higher, should during workpiece because temperature compared with Height, workpiece because of the effect expanded with heat and contract with cold, workpiece it is each it is microcosmic under hole can relatively open, so that machine oil can effectively enter In workpiece, the protecting effect to workpiece is improved.
Preferably, the method for the processing of polishing described in step 7):
S1. 1-3 polishing is carried out with fine sandpaper；
S2. 2-3 friction is carried out to workpiece with burlap；
S3. smooth to surface to workpiece 5-6 times friction with cotton；
S4. the smooth workpiece that rubs in step S3 is placed in 100 DEG C of water and is cleaned.
It polishes by using fine sandpaper, the most weaker zone of workpiece surface can be beaten substantially during the polishing It grinds off, then rubs by burlap, one side can rub off the weaker zone of workpiece surface completely, ensure on workpiece Weaker zone rubbed off completely, and cotton layer is set, secondary friction then will do it to the surface of workpiece, which can protect It is essentially smooth to hinder workpiece surface, so that the slickness of workpiece surface can be improved when carrying out secondary oxidation to workpiece, and It is rinsed using water, the cloth material debris of workpiece surface can be removed.
Preferably, nitriding furnace described in step 3) includes
Furnace body；
For holding base salt and placing the retort of workpiece；
For being heated to 520-580 DEG C of heating member to retort inside, which is sheathed on the retort outer wall；
The cooling-part of cold wind is blown into the furnace body；
With the furnace cover structure of furnace sealing cooperation, which seals at least two layers of the furnace body, and passes through furnace Lid structure can directly observe furnace interior reaction.
By the way that furnace cover structure is arranged, during carrying out nitriding to workpiece, furnace cover structure can carry out retort inside Heat preservation, realizes heat-insulated effect, and furnace cover structure is divided into two layers, can ensure furnace cover structure to the sealing effect of furnace body, It avoids the gas leakage in nitriding reaction process in retort and influences retort and nitriding reaction is carried out to workpiece, improve the infiltration to workpiece Nitrogen effect, and directly internal situation can be observed by the furnace cover structure, compared with existing nitriding furnace, existing nitrogen Change furnace when observing inner case, is all the bell opening directly by nitriding furnace, but nitriding furnace during it The toxic gas of interior generation can discharge outward, will affect the safety of operator, if but not opening always during use It checks, and can not accurately judge the progress of nitriding；And by the way that bell to be set as two layers, it can directly be checked, so both The case where internal-response, can be judged, the gas and temperature in nitriding furnace will not ensure the mistake in nitridation to external diffusion again The safety operated in journey, the same waste for reducing raw material, reduces heat loss.
Preferably, the furnace cover structure include the first lid, the second lid being flexibly connected with first lid and For opening the opening and closing component of first lid and the second lid, first lid is set to above second lid, and It can be observed inside the retort by second lid；By setting the first lid and the second lid, on the one hand it can be with It realizes two layers of sealing, improves sealing effect, on the other hand, the first lid is located at the top of second lid, can be to the Two lids are protected, and the second lid is avoided to be crushed due to by external force collision.
Preferably, second lid includes the fixing piece of cyclic annular setting and the lens of transparent setting, the fixing piece It is connected with the lens, and the fixing piece is connected with the fixing piece by a connecting component；By the way that lens, one side is arranged Face can obstruct gas and heat, on the other hand have good translucency, therefore inside energy accurate observation to nitriding furnace The case where.
Preferably, the connecting component includes the connector being flexibly connected with first lid, is sheathed on the company Elastic component on fitting and the sealing element on the connector, the fixing piece are equipped with one and match with the connector Locating part, the connector are matched with the opening and closing component；By setting connector and locating part, realize to the first lid And the second connection between lid, therefore when opening first lid and the second lid, it can work together and be opened, together Sample, after opening and closing component opens the first lid and the second lid, also avoid the second lid that movement occurs and causes nitriding furnace It is unstable；And elastic component, which is arranged, can ensure that connector when connection, is in close contact, and avoids the second lid from shaking；And Sealing element then can effectively ensure the leakproofness between connector and the first lid, ensure that the first lid is being connected it with nitriding furnace Leakproofness afterwards.
Preferably, the connector is equipped with the first limiting section, the locating part is equipped with and first limiting section The second limiting section matched；By contacting with each other between the first limiting section of setting and the second limiting section, beaten in opening and closing component It when opening furnace cover structure, can interconnect between the first lid and the second lid, thus the first lid and the second lid Cognition opens simultaneously, and facilitates and moves when charging either discharges to workpiece.
In conclusion the present invention can realize that base salt is utilized again by using sodium peroxide solid, cyanate radical is ensured Stability；Sodium ion can be ensured can be reacted in use process sodium ion with other ions in base salt, generate carbonic acid Sodium, to reduce the generation of sundries.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is cross-sectional view of the invention.
Fig. 3 is the enlarged drawing of A in Fig. 2.
Fig. 4 is partial exploded view of the invention.
Fig. 5 is the structural schematic diagram of the second lid of the invention.
Fig. 6 is the cross-sectional view of Fig. 5.
Fig. 7 is the structural schematic diagram on the first lid of the invention.
Fig. 8 is the cross-sectional view of Fig. 7.
Fig. 9 is the enlarged drawing of B in Fig. 8.
Figure 10 is the enlarged drawing of C in Fig. 8.
Figure 11 is the explosive view of Fig. 8.
Figure 12 is partial structural diagram of the invention.
Specific embodiment
In order to make those skilled in the art better understand the present invention program, below in conjunction in the embodiment of the present invention Attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described.
Embodiment one
A kind of metal surface salt-bath nitriding and QPQ technique include following step to work pieces process including metal works to be processed It is rapid:
1) workpiece is washed using the water logging containing detergent, washes workpiece with 100 DEG C of water logging after clear water flushing；
2) 300 DEG C are preheated to workpiece, preheating time 6min;
3) workpiece is placed in the nitriding furnace for being placed with the salt of the base containing Li ion, increases 520 DEG C of nitriding furnace, nitridation time is 80min;
4) sodium peroxide solid is added into base salt, and the weight ratio of solid peroxygen sodium and the weight ratio of the base salt are 1: 2.5；
5) after sodium peroxide solid is added, the temperature to heat up in nitriding furnace is to 520 DEG C, nitridation time 50min;
6) workpiece after nitridation is placed in the oxidation furnace containing saline oxide to carry out first time liquid oxidizing, heated oxide furnace temperature Degree is to 360 DEG C, oxidization time 15min
7) to the workpiece polishing treatment after first time aoxidizes
8) workpiece after polishing is subjected to second of liquid oxidizing, oxidation furnace temperature is 420 DEG C, oxidization time 25min；
9) it after the workpiece after completing secondary oxidation is cooled to 70 DEG C, then is placed in the machine oil that temperature is 20 DEG C and impregnates.
Further, the raw material of the component ratio by weight of base salt described in step 3) include: 3 parts of lithium carbonate, 8 parts of potassium chloride, 2 parts of sodium carbonate 5, carbonyl diamide；The raw material of the component ratio by weight of saline oxide described in step 6) includes: 2 parts of potassium hydroxide, nitric acid 5 parts of 5 parts of sodium, 12 parts of sodium carbonate and four ammonium chlorides.
Further, the method for the processing of polishing described in step 7):
S1. 1 polishing is carried out with fine sandpaper；
S2. 2 frictions are carried out to workpiece with burlap；
S3. smooth to surface to workpiece 5 times frictions with cotton；
S4. the smooth workpiece that rubs in step S3 is placed in 100 DEG C of water and is cleaned.
Embodiment two
A kind of metal surface salt-bath nitriding and QPQ technique include following step to work pieces process including metal works to be processed It is rapid:
1) workpiece is washed using the water logging containing detergent, washes workpiece with 100 DEG C of water logging after clear water flushing；
2) 355 DEG C are preheated to workpiece, preheating time 15min;
3) workpiece is placed in the nitriding furnace for being placed with the salt of the base containing Li ion, increases 550 DEG C of nitriding furnace, nitridation time is 93min；
4) sodium peroxide solid is added into base salt, and the weight ratio of solid peroxygen sodium and the weight ratio of the base salt are 1: 3.2；
5) after sodium peroxide solid is added, the temperature to heat up in nitriding furnace is to 550 DEG C, nitridation time 72min;
6) workpiece after nitridation is placed in the oxidation furnace containing saline oxide to carry out first time liquid oxidizing, heated oxide furnace temperature Degree is to 372 DEG C, oxidization time 18min；
7) to the workpiece polishing treatment after first time aoxidizes；
8) workpiece after polishing is subjected to second of liquid oxidizing, oxidation furnace temperature is 433 DEG C, oxidization time 28min；
9) it after the workpiece after completing secondary oxidation is cooled to 75 DEG C, then is placed in the machine oil that temperature is 28 DEG C and impregnates.
Further, the raw material of the component ratio by weight of base salt described in step 3) include: 4 parts of lithium carbonate, 12 parts of potassium chloride, 3 parts of sodium carbonate 7, carbonyl diamide；The raw material of the component ratio by weight of saline oxide described in step 6) includes: 3 parts of potassium hydroxide, nitric acid 6 parts of 6 parts of sodium, 13 parts of sodium carbonate and four ammonium chlorides.
Further, the method for the processing of polishing described in step 7):
S1. 2 polishings are carried out with fine sandpaper；
S2. 3 frictions are carried out to workpiece with burlap；
S3. smooth to surface to workpiece 5 times frictions with cotton；
S4. the smooth workpiece that rubs in step S3 is placed in 100 DEG C of water and is cleaned.
Embodiment three
A kind of metal surface salt-bath nitriding and QPQ technique include following step to work pieces process including metal works to be processed It is rapid:
1) workpiece is washed using the water logging containing detergent, washes workpiece with 100 DEG C of water logging after clear water flushing；
2) 385 DEG C are preheated to workpiece, preheating time 25min;
3) workpiece is placed in the nitriding furnace for being placed with the salt of the base containing Li ion, increases 580 DEG C of nitriding furnace, nitridation time is 100min;
4) sodium peroxide solid is added into base salt, and the weight ratio of solid peroxygen sodium and the weight ratio of the base salt are 1: 4.5；
5) after sodium peroxide solid is added, the temperature to heat up in nitriding furnace is to 580 DEG C, nitridation time 90min;
6) workpiece after nitridation is placed in the oxidation furnace containing saline oxide to carry out first time liquid oxidizing, heated oxide furnace temperature Degree is to 380 DEG C, oxidization time 20min；
7) to the workpiece polishing treatment after first time aoxidizes；
8) workpiece after polishing is subjected to second of liquid oxidizing, oxidation furnace temperature is 450 DEG C, oxidization time 30min；
9) it after the workpiece after completing secondary oxidation is cooled to 80 DEG C, then is placed in the machine oil that temperature is 35 DEG C and impregnates.
Further, the raw material of the component ratio by weight of base salt described in step 3) include: 5 parts of lithium carbonate, 15 parts of potassium chloride, 4 parts of sodium carbonate 8, carbonyl diamide；The raw material of the component ratio by weight of saline oxide described in step 6) includes: 5 parts of potassium hydroxide, nitric acid 7 parts of 8 parts of sodium, 15 parts of sodium carbonate and four ammonium chlorides.
Further, the method for the processing of polishing described in step 7):
S1. 3 polishings are carried out with fine sandpaper；
S2. 3 frictions are carried out to workpiece with burlap；
S3. smooth to surface to workpiece 6 times frictions with cotton；
S4. the smooth workpiece that rubs in step S3 is placed in 100 DEG C of water and is cleaned.
As shown in figs. 1-12, the invention also discloses the specific structure that kettle is nitrogenized described in embodiment 1-3, the nitridation kettles Including furnace body 1, retort 2, heating member 3, cooling-part 4 and furnace cover structure 5, wherein the furnace body 1 is metal can, the furnace body 1 Inner wall on have insulating layer 11, the insulating layer 11 be asbestos stratum reticulare, the retort 2 be set to the furnace body 1 in, the retort 2 For crucible, base salt and workpiece are placed in retort 2；The heating member 3 is a spiral helicine resistance wire of circle, and 3 sets of the heating member exists On the outer wall of the retort 2, therefore the heating member 3 realizes heating to retort 2, the retort 2 made when fever Internal temperature reaches 520-580 degrees Celsius；The cooling-part 4 includes blower 41 and ventilation shaft 42, after blower 41 starts, By ventilation shaft 42 to furnace interior transporting cold wind.
Further, the furnace cover structure 5 is used to close the opening of 1 upper end of furnace body, and the furnace cover structure 5 is to furnace body 1 The case where realizing two layers of sealing, and also base salt and workpiece in retort 2 directly directly being observed by the furnace cover structure 5；Specifically , the furnace cover structure 5 includes the first lid 51, the second lid 52 and opening and closing component 53；Wherein first lid 51 is circle The metal cover of shape, the edge of first lid 51 are equipped with the first sealing ring 511 of an annular setting, first sealing ring 511 be the becket being connected with 51 lower end surface of the first lid, the inner hollow of first sealing ring 511, and first It is filled with saturated acetic acid sodium solution inside sealing ring 511, the first seal groove 101 is equipped on the furnace body 1；In the first lid 51 When covering, first sealing ring 511 can be inserted into 101 in first seal groove, and in the process of nitriding furnace preheating In, the saturated acetic acid sodium solution in the first sealing ring 511 is heated, can become liquid from solid-state, and volume increases, and seals to first Each wall of circle 511, which is formed, to be squeezed, thus meeting between the side wall of the first sealing ring 511 and the inner wall of first seal groove 101 It closely fits together, and then plays good sealing effect, which can either ensure close to nitriding furnace progress During envelope, sealing is that effect is good, simultaneously as the first sealing ring 511 is made of metal, therefore the first sealing ring 511 makes It is long with the service life, it is not susceptible to rupture, and after restoring room temperature, saturated acetic acid sodium can be returned to solid-state again again, under It is unaffected when secondary use；And because the first sealing ring is made of metal, the first sealing ring energy high temperature resistant, For traditional rubber seal, situations such as temperature even if in furnace body 1 will not melt raising.
Specifically, second lid 52 is set to the lower section of first lid 51, second lid 52 includes fixing Part 521 and lens 522, the fixing piece 521 are becket, and the lens 522 are a glass lens resistant to high temperature, the lens 522 are connected with the fixing piece 521；The fixing piece 521 is connected by a hinge with first lid 51；In the hinge At the one of opposite, the fixing piece 521 is connected by two connecting components 54 with first lid 51；Meanwhile in the furnace The inner wall of body 1 is equipped with a support portion 109, and the second sealing ring 108, second sealing ring 108 are equipped on the support portion 109 It is identical as first sealing ring 511, it is similarly hollow setting inside second sealing ring 108, is filled out in the second sealing ring 108 Filled with saturated acetic acid sodium；The second seal groove 509 is equipped on the fixing piece 521, when under second lid 52 lid, Second sealing ring 108 can be inserted into second seal groove 509.
Further, the connecting component 54 includes connector 541, elastic component 542 and sealing element 543, the connector 541 be a metallic rod, which passes through from the second lid 52, which passes through a bearing and first lid Body 51 is connected；It is equipped with the first limiting section 501 in the lower section of the connector 541, first limiting section 501 is one with multiple The fan-shaped metal block of positioning convex portion 591, is equipped with locating part 544 on the fixing piece 521, and the locating part 544 is a metal Block, is equipped with the second limiting section 502 on the end of the locating part 544, and second limiting section 502 is fan-shaped metal block, institute It states the second limiting section 502 and is equipped with location indentations 581, when the connector 541 is matched with the locating part 544, The positioning convex portion 591 can be inserted into the location indentations 581；By setting positioning convex portion and location indentations, the When one lid and the second lid are connected, can mutually it be limited between the side wall of positioning convex portion and the inner wall of the location indentations, The process, which is realized, only needs two connecting components that can be stably connected with the first lid and the second lid, on the one hand reduces nitriding furnace system Required cost is made, the volume of nitriding furnace is on the other hand reduced, is not easy along bad.
Specifically, the elastic component 542 is a spring, 542 sets of the elastic component is on the connector, the elastic component 542 one end are connected with the connector 541, and the other end is connected with first lid 51, therefore the elastic component 541 is right always Connector 541 pulls up, and the sealing element 543 is the circle becket covered on the connector 541, the sealing element 543 For hollow setting, and internal solid sodium acetate is housed；543 upper surface of sealing element is more thin simultaneously, therefore with first When lid 51 thinks contact, deformation occurs and is recessed inwardly for the upper surface meeting of the sealing element 543；On first lid 51 Annular groove 517 equipped with flared setting, the sealing element 543 can be inserted into the annular groove 517.
Further, the opening and closing component 53 includes support frame 531, screw rod 532 and the driving motor 533 of L shape setting, institute State driving motor 533 be a servo motor, the screw rod 532 be a metal screw, the driving motor 533 by bevel gear with 532 lower end of screw rod is connected, therefore the driving motor 533 drives the screw rod 532 to rotate；It is set on support frame as described above 531 There is internal screw thread, which is sheathed on the screw rod 532, when 532 positive and negative rotation of screw rod, the support Frame 531 will do it up and down action；Support frame as described above 531 is equipped with more than one a pull rods 551, and first lid 51 is equipped with multiple The Coupling 552 matched with the pull rod 551.Specifically, the Coupling 552 is a metallic sheath, the drawing article 551 is worn Enter into the Coupling 552, and be connected with anti-drop block 553 in the bottom of the drawing article 551, is set on the Coupling 552 There is the extension block 554 with 553 anticreep of anti-drop block cooperation；Between having between the anti-drop block 553 and the extension block 554 Away from；Therefore when starting support frame as described above 531 moves upwards, after the pull rod 551 needs to move a distance, ability It is in contact with the anti-drop block 553, and then first lid 51 is pulled to move upwards, the pull rod 551 is a screw rod.
Specifically, being connected with a rotate gear 561 by bearing in the Coupling 552,541 upper end of connector connects It is connected to a rotation gear 549, the rotate gear 561 is meshed with the rotation gear 549；561 inner wall of rotate gear It is equipped with internal screw thread, which is mutually engaged with external screw thread on 551 outer wall of pull rod；Therefore in support frame as described above 531 When moving upwards, the pull rod 551 can be moved upwards, to drive the rotate gear 561 to rotate, thus described in driving It rotates gear 549 to rotate, and then the first limiting section 501 can be detached from the second limiting section 502, so as to which first lid 51 is first It opens；It is worth noting that, needing first to release elastic component 542 before individually opening the first lid 51 and opening the first lid 51 Bring influence is opened, that is, the connector 542 is allowed to move downward a distance.
In order to realize that external force allows connector 542 to move downward a distance, the pull rod 551 is set as two sections, the drawing Bar 551 includes first body of rod 571 and second body of rod 572, and first body of rod 571 is the metal being connected with support frame as described above 531 Bar, second body of rod 572 are the screw rod equipped with anti-drop block 553, are equipped with grafting chamber 573, institute in second body of rod, 572 upper end The lower end for stating first body of rod 571 is equipped with grafting protrusion 574, and the grafting protrusion 574 is inserted into the grafting chamber 573, and The section of the grafting chamber 573 is the chamber of a T shape, and the grafting protrusion 574 is the protrusion of inverted T-shaped, therefore in the support When frame 531 is movable upwards, relatively described second body of rod 572 of first body of rod 571 can move one section, then pull institute again State second body of rod, 572 activity；One compression bar 575 of connection, 575 one end of compression bar and described first are equipped on first lid 51 The body of rod 571 is connected, and the other end is flexibly connected with the upper end of the connector 542, and the middle part of the compression bar 575 passes through a plumbing bar 576 are connected with first lid 51, therefore described when the activity upwards of support frame as described above 531, first body of rod 571 It moves upwards, so that the other end of compression bar 575 pushes the connector 541 and moves downward, it makes use of lever principle, Jin Er Contact is disengaged between one limiting section 501 and the second limiting section 502, so that rotate gear can smooth band during subsequent operation The rotary teeth wheel rotation is moved, to connect contact between the first limiting section and the second limiting section.
The first pin hole 578 is equipped on first body of rod 571 simultaneously, it is detachable with one in first body of rod 571 Bolt 579, the bolt 579 is used to limit the end of compression bar 575 and move downward, if therefore not needing 575 pairs of compression bar connections Bolt 579 is extracted in compacting to part 541 downwards, and the end of the compression bar 575 will not be moved, therefore also just relieve 575 pairs of compression bar connections The process that part 542 pushes；With the second pin hole 580 being equipped on second body of rod 572, equally have on the Coupling Have through-hole, second pin hole 580 aligns with the through-hole, therefore do not need to move downward connector 541 when It waits, that is to say, that the first lid 51 and the second lid 52 needs rise at the same time, therefore above-mentioned bolt 579 is inserted into described lead to In hole and the second pin hole 580, the rise synchronous with the second lid 52 of the first lid 51 can be realized.
Multiple conduits and agitating paddle are additionally provided on existing bell, because the present invention has additional a traditional lid Second lid of observable, therefore each conduit is divided into two parts in process of production, a part is connected with the first lid, separately A part of second lid is connected, and when first lid and the second lid are connected, two-part conduit can be mutually close Envelope links together；Likewise, described agitating paddle etc. is arranged, traditional agitating shaft can also be divided into two parts, a part It being connected to the motor, another part is located on second lid, when first lid and connected the second lid, two Agitating shaft rotation stop is divided to link together；It is existing technical staff after watching this document, the problem of just can solve easily, Therefore it no longer specifically repeats herein.
Obviously, described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment should fall within the scope of the present invention.

Claims (10)

1. a kind of metal surface salt-bath nitriding and QPQ technique, including metal works to be processed, it is characterised in that: to workpiece plus Work the following steps are included:
1) workpiece is washed using the water logging containing detergent, washes workpiece with 100 DEG C of water logging after clear water flushing；
2) 300-385 DEG C is preheated to workpiece, preheating time 6-25min；
3) workpiece is placed in the nitriding furnace for being placed with the salt of the base containing Li ion, increases 520-580 DEG C of nitriding furnace, nitridation time is 80-100min；
4) sodium peroxide solid is added into base salt, and the weight ratio of solid peroxygen sodium and the weight ratio of the base salt are 1: 2.5-4.5；
5) after sodium peroxide solid is added, the temperature to heat up in nitriding furnace is to 520-580 DEG C, nitridation time 50-90min；
6) workpiece after nitridation is placed in the oxidation furnace containing saline oxide to carry out first time liquid oxidizing, heated oxide furnace temperature Degree is to 360-380 DEG C, oxidization time 15-20min；
7) to the workpiece polishing treatment after first time aoxidizes；
8) workpiece after polishing is subjected to second of liquid oxidizing, oxidation furnace temperature is 420-450 DEG C, oxidization time 25- 30min；
9) workpiece after completing secondary oxidation, which is placed in machine oil, to be impregnated.
2. a kind of metal surface salt-bath nitriding according to claim 1 and QPQ technique, it is characterised in that: institute in step 3) The raw material for stating base salt component ratio by weight includes: 3-5 parts of lithium carbonate, 8-15 parts of potassium chloride, 5-8 parts of sodium carbonate, carbonyl diamide 2-4 Part.
3. a kind of metal surface salt-bath nitriding according to claim 1 and QPQ technique, it is characterised in that: institute in step 6) The raw material for stating saline oxide component ratio by weight includes: 2-5 parts of potassium hydroxide, 5-8 parts of sodium nitrate, 12-15 parts of sodium carbonate and tetrachloro Change ammonium 5-7 parts.
4. a kind of metal surface salt-bath nitriding according to claim 1 and QPQ technique, it is characterised in that: work in step 9) After part is cooled to 70-80 DEG C, then it is placed in the machine oil that temperature is 20-35 DEG C and impregnates.
5. a kind of metal surface salt-bath nitriding according to claim 1 and QPQ technique, which is characterized in that institute in step 7) The method for the polishing processing stated:
S1. 1-3 polishing is carried out with fine sandpaper；
S2. 2-3 friction is carried out to workpiece with burlap；
S3. smooth to surface to workpiece 5-6 times friction with cotton；
S4. the smooth workpiece that rubs in step S3 is placed in 100 DEG C of water and is cleaned.
6. a kind of metal surface salt-bath nitriding according to claim 3 and QPQ technique, it is characterised in that: step 3) is described Nitriding furnace include
Furnace body (1)；
For holding base salt and placing the retort (2) of workpiece；
For to the heating member (3) for being heated to 520-580 DEG C inside retort (2), which to be sheathed on the retort (2) On outer wall；
The cooling-part (4) of cold wind is blown into the furnace body (1)；
The furnace cover structure (5) cooperated with the furnace body (1) sealing, the furnace cover structure (5) are close at least two layers of the furnace body (1) Envelope, and furnace body (1) internal-response can be directly observed by furnace cover structure (5).
7. a kind of metal surface salt-bath nitriding according to claim 6 and QPQ technique, it is characterised in that: the bell knot Structure (5) includes the first lid (51), the second lid (52) for being flexibly connected with first lid (51) and for described in opening The opening and closing component (53) of first lid (51) and the second lid (52), first lid (51) are set to second lid (52) Top, and the retort (2) inside can be observed by second lid (52).
8. a kind of metal surface salt-bath nitriding according to claim 7 and QPQ technique, it is characterised in that: second lid Body (52) includes the fixing piece (521) of cyclic annular setting and the lens (522) of transparent setting, the fixing piece (521) with it is described Mirror (522) is connected, and the fixing piece (521) is connected with first lid (51) by a connecting component (54).
9. a kind of metal surface salt-bath nitriding according to claim 8 and QPQ technique, it is characterised in that: the interconnecting piece Part (54) includes the connector (541) being flexibly connected with first lid (51), the bullet being sheathed on the connector (541) Property part (542) and be set to the connector (542) on sealing element (543), the fixing piece (521) be equipped with one with the company Fitting (542) matches locating part (544), and the connector (541) matches with the opening and closing component (53).
10. a kind of metal surface salt-bath nitriding according to claim 9 and QPQ technique, it is characterised in that: the connector (541) the first limiting section (501) are equipped with, the locating part (544) is equipped with and matches with first limiting section (501) Second limiting section (502).
CN201811533151.8A 2018-12-14 2018-12-14 Metal surface salt bath nitriding and QPQ (quench-Polish-quench) process Expired - Fee Related CN110230023B (en)

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CN113308665A (en) * 2021-05-30 2021-08-27 南京豪龙刀具制造有限公司 Wear-resistant hard alloy cutter and strengthening and toughening treatment device thereof
CN114086109A (en) * 2021-11-22 2022-02-25 湖南能岦新材料科技有限公司 Novel environment-friendly anticorrosion high-efficiency BSB metal surface treatment method

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CN103215539A (en) * 2006-04-18 2013-07-24 菲洛斯·琼贺·高 Process for diffusing titanium and nitride into a material having a coating thereon
CN105349942A (en) * 2015-12-02 2016-02-24 成都锦汇科技有限公司 QPQ (quench-polish-quench) salt bath treatment method
CN105483608A (en) * 2015-12-23 2016-04-13 德阳瑞泰科技有限公司 QPQ salt bath treatment technology of water hydraulic component

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CN1394982A (en) * 2002-06-20 2003-02-05 烟台海德机床厂 Vacuum well type tank-free ion carburizing multipurpose furnace
CN103215539A (en) * 2006-04-18 2013-07-24 菲洛斯·琼贺·高 Process for diffusing titanium and nitride into a material having a coating thereon
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CN113308665A (en) * 2021-05-30 2021-08-27 南京豪龙刀具制造有限公司 Wear-resistant hard alloy cutter and strengthening and toughening treatment device thereof
CN114086109A (en) * 2021-11-22 2022-02-25 湖南能岦新材料科技有限公司 Novel environment-friendly anticorrosion high-efficiency BSB metal surface treatment method

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