CN113560534B - Anti-oxidation treatment process for pre-buried threads - Google Patents
Anti-oxidation treatment process for pre-buried threads Download PDFInfo
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- CN113560534B CN113560534B CN202110797949.9A CN202110797949A CN113560534B CN 113560534 B CN113560534 B CN 113560534B CN 202110797949 A CN202110797949 A CN 202110797949A CN 113560534 B CN113560534 B CN 113560534B
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- threads
- thread
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
Abstract
The invention belongs to the technical field of embedded thread processing, and discloses an embedded thread anti-oxidation treatment process. The method comprises the following steps of S1, increasing the thickness of the outer wall of the embedded thread; s2, coating the threads with graphite grease in the pre-embedded threads, and drying; s3, tightly filling water glass sand in the threads coated with the graphite factice, and then drying to dry the water glass sand thoroughly; s4, placing the manufactured nut on a core print of the mold for pouring and embedding; s5, carrying out heat treatment on the poured and pre-buried threads; and S6, cleaning the sodium silicate sand in the threads after the heat treatment is finished, and then treating thread inclusions by using a screw tap. According to the invention, the graphite ointment is used for thoroughly brushing the threads, the sodium silicate sand is tightly filled into the threads after drying treatment, and the sodium silicate sand is pre-buried after drying treatment, so that the problem of serious thread deformation caused by high-temperature oxidation during thread pretreatment is avoided, and the stability of threaded connection is improved.
Description
Technical Field
The invention relates to the technical field of embedded thread processing, in particular to an embedded thread anti-oxidation treatment process.
Background
The existing cast product needs threads to be all through pre-buried steel bar, then obtains the threads through drilling and tapping on the steel bar, and the pre-buried threads are serious because of heat treatment high-temperature oxidation deformation, thread damage is big, and the screw rod is cup jointed and is rocked occasionally, resulting in that the screw rod can not be firmly fixed. The anti-oxidation treatment of the embedded thread is to ensure that the embedded thread is not oxidized during heat treatment and the original thread is not damaged during high-temperature heat treatment.
Disclosure of Invention
The invention aims to provide an anti-oxidation treatment process for pre-buried threads, which can keep the original threads undamaged during high-temperature heat treatment.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an anti-oxidation treatment process for pre-buried threads comprises the following steps:
s1, increasing the thickness of the outer wall of the embedded thread;
s2, coating graphite oil paste on the threads in the pre-embedded threads, and drying;
s3, filling water glass sand in the threads coated with the graphite factice, and then drying to dry the water glass sand thoroughly;
s4, placing the manufactured nut on a core print of the mold for pouring and embedding;
s5, carrying out heat treatment on the poured and pre-buried threads;
and S6, cleaning the sodium silicate sand in the threads after the heat treatment is finished, and then treating thread inclusions by using a screw tap.
Further, the step S2 specifically includes:
s21, mixing graphite powder and engine oil according to the mass ratio of 1:3, and uniformly stirring to obtain graphite ointment;
s22, coating a layer of water-based graphite paint on the surface of the thread, and drying;
s23, preheating the threads, and then uniformly coating the threads with graphite oil paste;
and S24, drying the coated threads.
Further, the aqueous graphite paint in the step S22 is formed by stirring water and graphite powder according to a mass ratio of 5:1.
Further, the drying temperature in the step S22 and the drying temperature in the step 24 are both 200-300 ℃.
Further, in the step S6, after the thread inclusions are processed by the tap, the thread is sleeved by the bolt for inspection processing.
The invention has the beneficial effects that:
the invention ensures the coating range and thickness of each thread by adding the thickness of the outer wall of the embedded thread and thoroughly coating the thread by the graphite ointment, and avoids the problem of serious thread deformation caused by high-temperature oxidation during the thread pretreatment by tightly filling sodium silicate sand into the thread after drying treatment and embedding the sodium silicate sand by drying treatment, thereby increasing the stability of thread connection.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a perspective view of a pre-embedded thread made by the process of the present invention;
fig. 3 is an overall structure view of the embedded thread manufactured by the treatment process of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, an anti-oxidation treatment process for embedded threads comprises the following steps:
s1, increasing the thickness of the outer wall of the embedded thread;
s2, coating graphite oil paste on the threads in the pre-embedded threads, and drying;
s3, filling water glass sand in the threads coated with the graphite factice, and then drying to dry the water glass sand thoroughly;
s4, placing the manufactured nut on a core print of the mold for pouring and embedding;
s5, carrying out heat treatment on the poured and pre-embedded threads;
and S6, cleaning the sodium silicate sand in the threads after the heat treatment is finished, and then treating thread inclusions by using a screw tap.
Wherein, step S2 specifically includes:
s21, mixing graphite powder and engine oil according to the mass ratio of 1:3, and uniformly stirring to obtain graphite ointment;
s22, coating a layer of water-based graphite paint on the surface of the thread, and drying;
s23, preheating the threads, and then uniformly coating the threads with graphite oil paste;
and S24, drying the coated threads.
It should be noted that the aqueous graphite paint in step S22 is prepared by stirring water and graphite powder in a mass ratio of 5:1.
Preferably, the drying temperature in step S22 and step S24 is 200-300 ℃.
In the above-mentioned step, step S1 is the key of technology improvement to the setting of pre-buried screw thread outer wall thickness, can reduce and cause pre-buried screw thread deformation because of high temperature during thermal treatment, need guarantee the thorough that the screw thread was applied paint with a brush when carrying out graphite oleamen, every screw thread need apply paint with a brush evenly promptly, thickness is moderate, need guarantee the compactness when carrying out sodium silicate sand packing, need to ensure simultaneously that the thoroughly stoving of sodium silicate sand can carry out pre-buried processing after, simultaneously, through the screw thread that the mould was poured out, clear up the sodium silicate sand again after carrying out thermal treatment, can further strengthen the stability of pre-buried screw thread when carrying out thermal treatment like this, prevent the screw thread deformation, reduce the screw thread damage. The pre-embedded threads can be formed in one step by casting by utilizing the treatment process, so that the working procedure of reprocessing by using pre-embedded steel bars is reduced.
And S5, putting the embedded nut into the core print of the manufactured mould in advance, pouring molten steel to fuse the outer surface of the embedded part after putting the embedded nut into the mould, and forming an embedded thread, wherein the size of the core print is the size of the embedded nut.
In addition, after the threaded inclusions are processed with a tap in step S6, the threads are screwed with a bolt for inspection processing. The screw thread stability is checked through the shaking degree of the bolt sleeved in the screw thread after the anti-oxidation treatment.
As shown in fig. 2-3, the embedded thread structure manufactured by the embedded thread anti-oxidation treatment process of the invention has the advantages of one-step casting forming, stable structure and convenient installation.
Claims (1)
1. An anti-oxidation treatment process for pre-buried threads comprises the following steps:
s1, increasing the thickness of the outer wall of the embedded thread;
s2, coating graphite oil paste on the threads in the pre-embedded threads, and drying;
s3, tightly filling sodium silicate sand in the threads coated with the graphite factice, and then drying to dry the sodium silicate sand thoroughly;
s4, placing the manufactured nut on a core print of the mold for pouring and embedding;
s5, carrying out heat treatment on the poured and pre-buried threads;
s6, cleaning the sodium silicate sand in the threads after the heat treatment is finished, and then treating thread inclusions by using a screw tap;
characterized in that the step S2 specifically comprises:
s21, mixing graphite powder and engine oil according to the mass ratio of 1:3, and uniformly stirring to obtain graphite ointment;
s22, coating a layer of water-based graphite paint on the surface of the thread, and drying;
s23, preheating the threads, and then uniformly coating the threads with graphite gypsum;
s24, drying the coated threads;
the drying temperature in the step S22 and the drying temperature in the step 24 are both 200-300 ℃; the water-based graphite paint in the step S22 is formed by stirring water and graphite powder according to the mass ratio of 5:1; and S6, after the thread inclusion is processed by using a screw tap, the thread is sleeved by using a bolt for inspection processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110797949.9A CN113560534B (en) | 2021-07-14 | 2021-07-14 | Anti-oxidation treatment process for pre-buried threads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110797949.9A CN113560534B (en) | 2021-07-14 | 2021-07-14 | Anti-oxidation treatment process for pre-buried threads |
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| Publication Number | Publication Date |
|---|---|
| CN113560534A CN113560534A (en) | 2021-10-29 |
| CN113560534B true CN113560534B (en) | 2023-04-07 |
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| CN202110797949.9A Active CN113560534B (en) | 2021-07-14 | 2021-07-14 | Anti-oxidation treatment process for pre-buried threads |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108754409A (en) * | 2018-06-13 | 2018-11-06 | 西南科技大学 | The method for preparing antioxidant coating in Mo metallic surface under being protected based on activated carbon powder |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62118960A (en) * | 1985-11-15 | 1987-05-30 | Asahi Malleable Iron Co Ltd | Method for forming internal screw part to casting |
| JP3712171B2 (en) * | 1999-10-28 | 2005-11-02 | 日立金属株式会社 | Manufacturing method of female screw part and cast part |
| US6460601B1 (en) * | 2000-04-13 | 2002-10-08 | Bredent Dentalgerate U. Materialien Fach- U. Organisationsberatung Peter Brehm | Method of producing internal screw threads, especially in metals or their alloys |
| JP4033147B2 (en) * | 2004-02-24 | 2008-01-16 | 株式会社豊田自動織機 | Casting method and casting for castings |
| JP4033162B2 (en) * | 2004-04-05 | 2008-01-16 | 株式会社豊田自動織機 | Casting cap nut and casting method using cast cap nut |
| CN104069776B (en) * | 2014-07-16 | 2016-07-06 | 太原科技大学 | Oxidation and the method for new material is prepared in calcining |
| CN110421147A (en) * | 2019-08-27 | 2019-11-08 | 盛瑞传动股份有限公司 | The casting method of internal screw thread on a kind of heavy castings |
| CN211041913U (en) * | 2019-11-27 | 2020-07-17 | 大冶市华顺机械制造有限公司 | Marine intercooler casing |
| CN111112581A (en) * | 2020-01-15 | 2020-05-08 | 四川优机实业股份有限公司 | High manganese steel part and processing device and processing method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108754409A (en) * | 2018-06-13 | 2018-11-06 | 西南科技大学 | The method for preparing antioxidant coating in Mo metallic surface under being protected based on activated carbon powder |
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