CN117400162A - Protection device and method for part local sand blasting nitriding - Google Patents
Protection device and method for part local sand blasting nitriding Download PDFInfo
- Publication number
- CN117400162A CN117400162A CN202311565931.1A CN202311565931A CN117400162A CN 117400162 A CN117400162 A CN 117400162A CN 202311565931 A CN202311565931 A CN 202311565931A CN 117400162 A CN117400162 A CN 117400162A
- Authority
- CN
- China
- Prior art keywords
- blown
- sand
- hole
- hole section
- nitriding
- Prior art date
- 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
Links
- 238000005121 nitriding Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005488 sandblasting Methods 0.000 title claims abstract description 12
- 239000002390 adhesive tape Substances 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 5
- 239000004576 sand Substances 0.000 claims description 66
- 238000007664 blowing Methods 0.000 claims description 34
- 230000002093 peripheral effect Effects 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 238000007747 plating Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 231100000719 pollutant Toxicity 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims 9
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000004804 winding Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
A protection device and a method for part local sand blasting nitriding, wherein the protection device comprises a base and a protecting cover; the base comprises an annular plate and an annular boss integrally formed on the annular plate; the annular boss is used for being inserted into the lower hole section of the stepped hole of the part to be blown, and the top end of the annular boss is propped against the inner stepped surface of the part to be blown; the protective cover is provided with a stepped through hole, and a first step surface is formed in the stepped through hole; the protecting cover is used for being buckled on the part to be blown, the top end of the part to be blown abuts against the first step surface, and the bottom end of the protecting cover abuts against the top surface of the annular plate. The method for part local sand blasting nitriding adopts the protecting device. The protection device provided by the invention only leaks out of the hole surface of the upper hole section of the inner hole of the part to be blown when protecting, can effectively protect the part to be blown, and overcomes the defect that the traditional technology adopts a mode of manually winding adhesive tape to protect the non-nitriding surface.
Description
Technical Field
The invention relates to the technical field of chemical heat treatment, in particular to a protection device and a protection method for part local sand blasting nitriding, which are suitable for protecting stainless steel parts in an aeroengine.
Background
According to the use requirement, the part needs to be locally nitrided, the non-nitrided surface is protected by adopting a method of copper plating, nickel plating or allowance for processing, meanwhile, as the stainless steel contains a large amount of chromium, a compact passivation film is formed on the surface, nitrogen atoms are seriously blocked during nitriding, and therefore, the passivation film of the nitrided surface needs to be removed by adopting a sand blasting mode before nitriding the part. For this purpose, the non-sand blasting surface (i.e. copper-plated surface and nickel-plated surface) is protected, and the conventional protection technology is to protect the non-nitriding surface by using rubberized fabric.
As shown in fig. 1, the stainless steel nitriding part for an aeroengine is of an annular structure, the middle part of the part is provided with a stepped inner hole, the part comprises an upper hole section 3a and a lower hole section 3b from top to bottom, and an inner stepped surface 3e is formed between the upper hole section 3a and the lower hole section 3 b; the periphery of the part is a stepped surface. The top-down device comprises an upper cylindrical surface 3c and a lower cylindrical surface 3d, and an outer stepped surface 3f is formed between the upper cylindrical surface 3c and the lower cylindrical surface 3 d. The hole surface of the upper hole section 3a of the part is a nitriding surface, and the other parts are not allowed to be nitrided; aiming at the part, the non-nitriding surface is protected by manually winding the adhesive tape. Because the part structure is complicated, the consistency of the manual winding adhesive tape is extremely poor, the transition area of the nitriding surface and the non-nitriding surface is not easy to control, the high skill requirement is provided for workers, and the probability of quality problems caused by human factors is increased intangibly. After sand blowing, the medical adhesive tape is adhered to the protected surface, and the medical adhesive tape can be burnt to form oxides at nitriding temperature without being removed, so that the nitriding quality of the part is seriously affected. It can be seen that the protection method of the manually wound tape has a serious influence on the nitriding quality of the part shown in fig. 1.
Disclosure of Invention
The invention mainly aims to provide a protection device and a protection method for part local sand blasting nitriding, and aims to solve the technical problems.
In order to achieve the above purpose, in one aspect, the invention provides a protection device for part local sand blasting nitriding, comprising a base and a protecting cover; the base comprises an annular plate and an annular boss integrally formed on the annular plate; the annular boss is used for being inserted into the lower hole section of the stepped hole of the part to be blown, and the top end of the annular boss is propped against the inner stepped surface of the part to be blown; the protective cover is provided with a stepped through hole, and a first step surface is formed in the stepped through hole; the protecting cover is used for being buckled on the part to be blown, the top end of the part to be blown abuts against the first step surface, and the bottom end of the protecting cover abuts against the top surface of the annular plate.
Preferably, the outer peripheral surface of the annular boss is in sliding fit with the lower hole Duan Kongmian of the part to be blown with sand, and the diameter of the inner hole of the annular boss is phi D, so that phi D is less than or equal to phi E; wherein: phi E is the inner diameter of the upper hole section of the part to be blown.
Preferably, the stepped through hole of the protecting cover sequentially comprises a first hole section, a second hole section and a third hole section from top to bottom; the diameters of the hole sections are sequentially increased from top to bottom; the first step surface is formed between the first hole section and the second hole section; the inner diameter of the first hole section is phi F, and phi F is less than or equal to phi E; wherein: phi E is the inner diameter of the upper hole section of the part to be blown.
Preferably, the second and third hole sections have an overall height H equal to the height of the part to be blown.
Preferably, the height of the second hole section is h1, and h1 is smaller than h2; wherein: h2 is the height of the upper cylindrical surface of the outer stepped surface of the part to be blown; the inner hole surface of the second hole section is in sliding fit with the upper cylindrical surface of the outer step surface of the part to be blown.
Preferably, the outer diameter of the annular plate is equal to the outer diameter of the protective cover.
On the other hand, the invention also provides a part local sand blasting nitriding method, which adopts the protecting device and comprises the following steps:
s1, cleaning a part to be blown with sand;
s2, copper plating: copper plating protection is carried out on the non-nitriding surface of the part to be blown with sand;
step S3, clamping: inserting the base comprising an annular boss into the stepped inner hole of the part to be blown from the lower end of the part to be blown, so that the top end of the annular boss is abutted against the inner stepped surface of the part to be blown; the protecting cover is buckled on the part to be blown with sand, the top end of the part to be blown with sand is propped against the first step surface in the protecting cover, and the bottom end of the protecting cover is propped against the top surface of the annular plate;
step S4, blowing sand: the protection device is communicated with the part to be blown sand and is put on a sand blowing disc, blowing sand on the blown sand surface of the part to be blown;
step S5, checking: after sand blowing, the base and the protecting cover are removed, and the nitriding surface is checked to be dark gray or silver gray, so that the metal luster and other pollutants are avoided.
Preferably, in step S1, the surface of the part is cleaned with acetone or absolute ethanol.
Preferably, in step S3, after clamping, an adhesive tape is wound around the outer peripheral surface of the butt joint portion of the base and the protecting cover, so that the base and the protecting cover are connected together.
Preferably, in the step S4, during sand blowing, sand 80# to 120# brown corundum is adopted, a nozzle with the diameter of 7mm is used for sand blowing, the pressure of the blowing air is 0.2MPa, and the blowing direction and the blown sand surface of the part to be blown sand form an angle of 45 degrees to 55 degrees; the distance between the sand blowing nozzle and the surface to be blown is 200 mm-250 mm.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) According to the invention, the annular boss on the base is inserted into the lower hole section of the stepped hole of the part to be blown, and the top end of the annular boss is abutted against the inner stepped surface of the part to be blown, so that the inner stepped surface and the lower hole section of the part to be blown can be effectively shielded and protected; the protecting cover is used for being buckled on the part to be blown with sand, the top end of the part to be blown with sand is propped against the first step surface in the protecting cover, the bottom end of the protecting cover is propped against the top surface of the annular plate, and the top surface and the peripheral surface of the part to be blown with sand can be shielded and protected. Therefore, by utilizing the protection device provided by the invention, only the sand blown surface of the part to be blown is leaked during protection, namely, only the hole surface of the upper hole section of the inner hole of the part to be blown is leaked, and the protection device can effectively protect the part to be blown.
(2) Compared with the traditional adhesive tape protection technology, the protection device provided by the invention has the advantages of simple structure, economy, practicability, convenience in operation, low cost and high efficiency, ensures the quality requirements of the nitriding surface and the non-nitriding surface of the part, and overcomes the defect that the non-nitriding surface is protected by adopting a manual tape winding mode in the traditional technology.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a stainless steel nitriding part for an aeroengine, namely a part to be blown with sand in the invention;
figure 2 is a cross-sectional view of the guard of the present invention;
fig. 3 is a schematic view of the part to be blown with sand clamped in the protection device.
Reference numerals illustrate: 1. a base; 1a, an annular plate; ab. An annular boss; 2. a protective cover; 2a, a first hole section; 2b, a second bore section; 2c, a third hole section; 2d, a first step surface; 2e, a second step surface; 3. the part to be blown with sand; 3a, an upper hole section; 3b, a lower hole section; 3c, upper cylindrical surface; 3d, a lower cylindrical surface; 3e, inner step surface; 3f, outer step surface.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
With reference to fig. 1, a schematic diagram of a stainless steel nitriding part for an aeroengine is shown, namely a part 3 to be blown with sand in the invention. The part is of an annular structure, the middle part of the part is provided with a stepped inner hole, the part comprises an upper hole section 3a and a lower hole section 3b from top to bottom, and the aperture of the upper hole section 3a is smaller than that of the lower hole section 3 b; an inner step surface 3e is formed between the upper hole section 3a and the lower hole section 3 b; the periphery of the part is a stepped surface, the part comprises an upper cylindrical surface 3c and a lower cylindrical surface 3d from top to bottom, an outer stepped surface 3f is formed between the upper cylindrical surface 3c and the lower cylindrical surface 3d, and the diameter of the upper cylindrical surface 3c is smaller than that of the lower cylindrical surface 3 d. The hole surface of the upper hole section 3a of the part is a nitriding surface, and the rest parts are not allowed to be nitrided.
Referring to fig. 2, in order to the above-mentioned part 3 to be blown with sand, on one hand, the present embodiment proposes a protection device for part local blowing with sand and nitriding, which includes a base 1 and a protecting cover 2; the base 1 includes an annular plate 1a, and an annular boss 1b integrally formed on the annular plate 1 a; the annular boss 1b is used for being inserted into a lower hole section 3b of the stepped hole of the part 3 to be blown, and the top end of the annular boss 1b is abutted against an inner stepped surface 3e of the part 3 to be blown; the cover 2 has a stepped through hole, and a first stepped surface 2d is formed in the stepped through hole; the protecting cover 2 is used for being buckled on the part 3 to be blown, the top end of the part 3 to be blown abuts against the first step surface 2d, and the bottom end of the protecting cover 2 abuts against the top surface of the annular plate 1 a. Through adopting protector, base 1 can be treated the interior step face 3e of blowing sand part 3 and lower hole section 3b and form effective shielding protection, and protecting cover 2 can be treated the top surface and the outer peripheral face of blowing sand part 3 and shelter from the protection, only spill the by blowing sand face of treating blowing sand part 3, only spill promptly and treat the hole face of the upper hole section 3a of blowing sand part 3 hole, consequently this protector can treat blowing sand part 3 and form effective protection.
Referring to fig. 2 and 3, the outer peripheral surface of the annular boss 1b is in sliding fit with the hole surface of the lower hole section 3b of the part 3 to be blown, and the diameter of the inner hole of the annular boss 1b is phid, so that phid is less than or equal to phie; wherein: phi E is the inner diameter of the upper hole section 3a of the part 3 to be blown. When the protection device is used for protection, the top surface of the annular boss 1b is abutted against the inner stepped surface 3E of the part 3 to be blown with sand, and the inner hole diameter phi D of the annular boss 1b is controlled to be less than or equal to phi E, so that the top surface of the annular boss 1b can completely shield the inner stepped surface 3E, and the inner stepped surface 3E is prevented from being exposed.
As shown in fig. 2 and 3, the stepped through hole of the protecting cover 2 sequentially includes a first hole section 2a, a second hole section 2b and a third hole section 2c from top to bottom; the diameters of the hole sections are sequentially increased from top to bottom; the first step surface 2d is formed between the first hole section 2a and the second hole section 2b, and the second step surface 2e is formed between the second hole section 2b and the third hole section 2c; the inner diameter of the first hole section 2a is phi F, and phi F is less than or equal to phi E; wherein: phi E is the inner diameter of the upper hole section 3a of the part 3 to be blown. When the protection device is used for protection, the top end of the part 3 to be blown out abuts against the first step surface 2d, and the inner diameter phi F of the first hole section 2a is controlled to be less than or equal to phi E, so that the first step surface 2d can form a complete shielding for the top surface of the part 3 to be blown out, and the top surface of the part 3 to be blown out is prevented from being exposed.
As shown in connection with fig. 2 and 3, the second hole section 2b and the third hole section 2c have a total height H equal to the height of the part 3 to be blown with sand. Through controlling the total height of the second hole section 2b and the third hole section 2c, the bottom end of the protecting cover 2 can be enabled to be just propped against the top surface of the annular plate 1a when the protecting device is utilized for protection, and meanwhile, the axial position of the part 3 to be blown by sand can be well limited after the protecting cover 2 is butted with the annular plate 1a, so that axial movement is avoided.
As shown in fig. 2 and 3, the height of the second hole section 2b is h1, and h1 is smaller than h2; wherein: h2 is the height of the upper cylindrical surface 3c of the outer stepped surface of the part 3 to be blown, and the inner hole surface of the second hole section 2b is in sliding fit with the upper cylindrical surface 3c of the outer stepped surface of the part 3 to be blown. Because h1 is less than h2, the interference between the second step surface 2e of the protecting cover and the outer step surface 3f of the part 3 to be blown with sand is avoided, and the bottom end of the protecting cover 2 is guaranteed to be just abutted against the top surface of the annular plate 1 a.
As shown in fig. 3, the outer diameter of the annular plate 1a is equal to the outer diameter of the protecting cover 2, so that after the part 3 to be blown sand is clamped in the protecting device, the outer peripheral surface of the butt joint part of the base 1 and the protecting cover 2 is wound with adhesive tape, and the base 1 and the protecting cover 2 are connected together.
On the other hand, the embodiment also provides a part local sand blasting nitriding method, which adopts the protecting device and comprises the following steps:
s1, cleaning a part 3 to be blown with sand; during cleaning, acetone or absolute ethyl alcohol is adopted to clean the surfaces of the parts; acetone or absolute ethyl alcohol can effectively remove oil stain on parts.
S2, copper plating: and carrying out copper plating protection on the non-nitriding surface of the part 3 to be blown.
Step S3, clamping: inserting the base 1 comprising the annular boss 1b into the stepped inner hole of the part 3 to be blown from the lower end of the part 3 to be blown, so that the top end of the annular boss 1b is abutted against the inner stepped surface 3e of the part 3 to be blown; the protecting cover 2 is buckled on the part 3 to be blown with sand, the top end of the part 3 to be blown with sand is abutted against the first step surface 2d in the protecting cover 2, and the bottom end of the protecting cover 2 is abutted against the top surface of the annular plate 1 a; after clamping, the adhesive tape is wound on the outer peripheral surface of the butt joint part of the base 1 and the protecting cover 2, so that the base 1 and the protecting cover 2 are connected together.
Step S4, blowing sand: the protection device is communicated with the part 3 to be blown and is put on a sand blowing disc, and sand blowing is carried out on the surface of the part 3 to be blown; specifically, during sand blowing, sand 80# to 120# brown corundum is adopted, a nozzle with the diameter of 7mm is used for sand blowing, the pressure of the sand blowing wind is 0.2MPa, and the angle between the sand blowing direction and the blown sand surface of the part 3 to be blown sand is 45 degrees to 55 degrees; the distance between the sand blowing nozzle and the surface to be blown is 200 mm-250 mm.
Step S5, checking: after sand blowing, the base 1 and the protecting cover 2 are removed, and the nitriding surface is checked to be dark gray or silver gray, so that the metal luster and other pollutants are avoided.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather, the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. A protection device for part local sand blasting nitriding is characterized in that: comprises a base (1) and a protecting cover (2);
the base (1) comprises an annular plate (1 a) and an annular boss (1 b) integrally formed on the annular plate (1 a); the annular boss (1 b) is used for being inserted into a lower hole section (3 b) of the stepped hole of the part (3) to be blown, and the top end of the annular boss (1 b) is abutted against an inner stepped surface (3 e) of the part (3) to be blown;
the protective cover (2) is provided with a step-shaped through hole, and a first step surface (2 d) is formed in the step-shaped through hole; the protecting cover (2) is used for being buckled on the part (3) to be blown with sand, the top end of the part (3) to be blown with sand is propped against the first step surface (2 d), and the bottom end of the protecting cover (2) is propped against the top surface of the annular plate (1 a).
2. A part partial grit blasting nitrided guard as in claim 1, wherein: the outer peripheral surface of the annular boss (1 b) is in sliding fit with the hole surface of the lower hole section (3 b) of the part (3) to be blown, and the diameter of an inner hole of the annular boss (1 b) is phi D, so that phi D is less than or equal to phi E;
wherein: phi E is the inner diameter of the upper hole section (3 a) of the part (3) to be blown.
3. A part partial grit blasting nitrided guard as in claim 1, wherein: the stepped through hole of the protecting cover (2) comprises a first hole section (2 a), a second hole section (2 b) and a third hole section (2 c) from top to bottom in sequence; the diameters of the hole sections are sequentially increased from top to bottom; the first step surface (2 d) is formed between the first hole section (2 a) and the second hole section (2 b);
the inner diameter of the first hole section (2 a) is phi F, and phi F is less than or equal to phi E;
wherein: phi E is the inner diameter of the upper hole section (3 a) of the part (3) to be blown.
4. A part partial grit blasting nitrided guard as in claim 3, wherein: the second hole section (2 b) and the third hole section (2 c) have a total height H, which is equal to the height of the part (3) to be blown.
5. A part partial grit blasting nitrided guard as in claim 3, wherein: the height of the second hole section (2 b) is h1, and h1 is smaller than h2;
wherein: h2 is the height of an upper cylindrical surface (3 c) of the outer stepped surface of the part (3) to be blown;
the inner hole surface of the second hole section (2 b) is in sliding fit with the upper cylindrical surface (3 c) of the outer stepped surface of the part (3) to be blown.
6. A part partial grit blasting nitrided guard as in claim 1, wherein: the outer diameter of the annular plate (1 a) is equal to the outer diameter of the protecting cover (2).
7. A method of partial grit blasting nitriding of a component, characterized by using a guard according to any one of claims 1 to 6, comprising the steps of:
s1, cleaning a part (3) to be blown with sand;
s2, copper plating: copper plating protection is carried out on the non-nitriding surface of the part (3) to be blown with sand;
step S3, clamping: inserting the base (1) comprising an annular boss (1 b) into a stepped inner hole of the part (3) to be blown from the lower end of the part (3) to be blown, so that the top end of the annular boss (1 b) is abutted against an inner stepped surface (3 e) of the part (3) to be blown; the protection cover (2) is buckled on the part (3) to be blown with sand, the top end of the part (3) to be blown with sand is propped against the first step surface (2 d) in the protection cover (2), and the bottom end of the protection cover (2) is propped against the top surface of the annular plate (1 a);
step S4, blowing sand: the protection device is communicated with the part (3) to be blown to be placed on a blowing disc together, and sand is blown to the blown sand surface of the part (3) to be blown to be sand;
step S5, checking: after sand blowing, the base (1) and the protecting cover (2) are removed, and the nitriding surface is checked to be dark gray or silver gray, so that the metal luster and other pollutants are avoided.
8. A method of part partial grit blasting nitriding of claim 7, wherein: in the step S1, acetone or absolute ethyl alcohol is adopted to clean the surface of the part during cleaning.
9. A method of part partial grit blasting nitriding of claim 7, wherein: in the step S3, after clamping, the adhesive tape is wound on the outer peripheral surface of the butt joint part of the base (1) and the protecting cover (2), so that the base (1) and the protecting cover (2) are connected together.
10. A method of part partial grit blasting nitriding of claim 7, wherein: in the step S4, during sand blowing, sand 80# to 120# brown corundum is adopted, a nozzle with the diameter of 7mm is used for sand blowing, the pressure of the sand blowing wind is 0.2MPa, and the direction of the sand blowing forms an angle of 45 degrees to 55 degrees with the surface of the part (3) to be blown by the sand; the distance between the sand blowing nozzle and the surface to be blown is 200 mm-250 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311565931.1A CN117400162A (en) | 2023-11-22 | 2023-11-22 | Protection device and method for part local sand blasting nitriding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311565931.1A CN117400162A (en) | 2023-11-22 | 2023-11-22 | Protection device and method for part local sand blasting nitriding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117400162A true CN117400162A (en) | 2024-01-16 |
Family
ID=89489048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311565931.1A Pending CN117400162A (en) | 2023-11-22 | 2023-11-22 | Protection device and method for part local sand blasting nitriding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117400162A (en) |
-
2023
- 2023-11-22 CN CN202311565931.1A patent/CN117400162A/en active Pending
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