阅读说明：本技术 管状零件局部化学镀覆的保护工装及镀覆方法 (Protection tool and plating method for local chemical plating of tubular part ) 是由 钟代银 万登勇 辛丽坡 翟海清 王涛 罗定莉 于 2021-07-06 设计创作，主要内容包括：本发明公开一种管状零件局部化学镀覆的保护工装及及镀覆方法,工装包括螺杆(5),其特征在于：螺杆(5)是一根阶梯轴,两端各有一段螺纹段和压花把手(9)配合,压花把手(9)内侧设有压盖,压盖套在螺杆(5)上,螺杆(5)上半段的颈部套装有密封环(4)。将零件和工装固定,用吊环将零件和工装吊至槽中施镀,镀完后拆除工装,用胶带将零件包覆并露出小端,在小端端口插入胶塞,去除小端外圆周上的镀层。该镀前保护方法彻底解决零件局部镀镍、除镍困难问题。同时解决前期工艺流程酸液腐蚀影响内腔尺寸问题,使用专用工装保护方法有效规避前期采用涂胶、涂蜡绝缘方式耗时长的弊端,缩短加工周期和减少成本。(The invention discloses a protective tool and a plating method for local chemical plating of tubular parts, wherein the tool comprises a screw (5), and is characterized in that: the screw rod (5) is a stepped shaft, two ends of the stepped shaft are respectively provided with a section of thread section which is matched with the embossing handle (9), a gland is arranged on the inner side of the embossing handle (9) and sleeved on the screw rod (5), and the neck part of the upper half section of the screw rod (5) is sleeved with a sealing ring (4). Fixing the part and the tool, hoisting the part and the tool to the groove by using a hoisting ring for plating, dismantling the tool after plating, coating the part by using an adhesive tape and exposing the small end, inserting a rubber plug into the port of the small end, and removing a coating on the outer circumference of the small end. The pre-plating protection method thoroughly solves the problem that the local nickel plating and nickel removal of parts are difficult. Meanwhile, the problem that the size of the inner cavity is influenced by acid liquor corrosion in the earlier process flow is solved, the defect that the time consumption is long due to the adoption of a gluing and waxing insulation mode in the earlier stage is effectively overcome by using a special tool protection method, the processing period is shortened, and the cost is reduced.)

1. The utility model provides a protection frock of local chemical plating of tubulose part, includes screw rod (5), its characterized in that: the screw rod (5) is a stepped shaft, two ends of the stepped shaft are respectively provided with a section of thread section which is matched with the embossing handle (9), a gland is arranged on the inner side of the embossing handle (9) and sleeved on the screw rod (5), and the neck part of the upper half section of the screw rod (5) is sleeved with a sealing ring (4).

2. The tool for protecting the local electroless plating of the tubular part according to claim 1, wherein: a sealing gasket is arranged between the embossing handle (9) and the gland, and a sealing ring is arranged on the inner side of the gland.

3. The tool for protecting the local electroless plating of the tubular part according to claim 1, wherein: the screw (5) is sequentially provided with a thread section, a gland mounting section, a sealing ring mounting section, a middle section, a gland mounting section and a thread section from top to bottom.

4. The tool for protecting the local electroless plating of the tubular part according to claim 3, wherein: the mounting section of the sealing ring is conical, a positioning shaft shoulder is arranged at the junction of the conical section and the middle section, and the inner surface of the sealing ring (4) is conical.

5. The tool for protecting the local electroless plating of the tubular part according to claim 4, wherein: the outer pipe wall of one end of the tubular part to be clamped is provided with a step structure, the step structure is provided with a circle of inclined holes which penetrate through to the central cavity of the part, and the outer end face of the step structure is provided with two circles of grooves.

6. The tool for protecting the local electroless plating of the tubular part according to claim 5, wherein: under the clamping state, the screw rod (5) penetrates through the tubular part, the two pressing covers are respectively matched with the two end faces of the tubular part, the inner surface of the sealing ring (4) is matched with the conical section on the screw rod (5), the outer surface of the sealing ring (4) blocks the end face of a circle of inclined hole on the inner wall face of the tubular part, and the two ends of the sealing ring are screwed by the embossing handles (9).

7. The tool for protecting the local electroless plating of the tubular part according to claim 6, wherein: the gland blocks the inner ring groove on the step structure.

8. The tool for protecting the local electroless plating of the tubular part according to claim 6, wherein: the inner side of the gland is provided with a section of convex structure which extends into the inner cavity of the tubular part, and the sealing ring (4) is compressed under the combined action of the convex structure of the gland and the conical section on the screw rod (5) in a clamping state.

9. The tool for protecting the local electroless plating of the tubular part according to claim 6, wherein the clamping step is as follows: firstly, sleeving a sealing ring (4) on a screw (5), loading the screw into an inner cavity of a part, and blocking an inclined hole of the inner cavity by the sealing ring (4); secondly, a sealing ring, a gland, a sealing gasket and an embossing handle (9) are sequentially arranged at the big end of the part and screwed tightly; and thirdly, sequentially arranging a sealing ring, a gland, a sealing gasket and an embossing handle (9) at the small end of the part and screwing.

10. A method for localized electroless plating of tubular parts, comprising: fixing the parts and the tooling according to the clamping step of claim 9, hoisting the parts and the tooling into the groove with a hoisting ring for plating, removing the tooling after plating, covering the parts with an adhesive tape and exposing the small end, inserting a rubber plug into the port of the small end, and removing the plating on the outer circumference of the small end.

Technical Field

The invention relates to a tool and a method for carrying out local plating on the surface of a part.

Background

Electroless nickel plating is a plating method in which metal ions are deposited on the surface of a part by a reduction reaction using a reducing agent in a solution under electroless current conditions. The chemical nickel plating process has high deep plating capacity, can realize the complete coverage of the nickel plating layer on the surface of a complex part, and has the characteristics of high uniformity, low porosity, high hardness, high wear resistance, stable chemical performance and the like.

In actual production, nickel is usually needed to be plated on some surfaces of a part, and the rest surfaces of the part do not need or cannot be plated with nickel. For parts with holes, the nickel plating protection difficulty is higher, acid liquor easily enters the surface of the part to be plated from unprotected air holes or needle holes in the holes of the inner cavity during nickel removal, and therefore a nickel layer with a required surface is corroded, and the part needs to be reworked and plated with nickel again. Meanwhile, the existing protection mode is quite difficult to remove the insulator after nickel removal is finished, and the protection glue in the small holes at the large end is difficult to completely remove, so that redundant residues are left on parts. In the whole operation process, operators waste time and labor, and the risk of failure of removing nickel in part protection is also existed.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the problem that the porous part is not easy to carry out local nickel plating and nickel removal protection, the plating protection tool and the plating protection method for the part with the porous and tubular structure are provided.

The technical scheme of the invention is as follows:

the utility model provides a protection frock of local chemical plating of tubulose part, includes screw rod 5, and screw rod 5 is a step shaft, and both ends respectively have one section screw thread section and knurling handle 9 cooperation, and knurling handle 9 inboard is equipped with the gland, and the gland cover is on screw rod 5, and the neck cover of the first half section of screw rod 5 is equipped with sealing ring 4.

A sealing gasket is arranged between the embossing handle 9 and the gland, and a sealing ring is arranged on the inner side of the gland.

The screw rod 5 is sequentially provided with a thread section, a gland mounting section, a sealing ring mounting section, a middle section, a gland mounting section and a thread section from top to bottom.

The mounting section of the sealing ring is conical, a positioning shaft shoulder is arranged at the junction of the conical section and the middle section, and the inner surface of the sealing ring 4 is conical.

The outer pipe wall of one end of the tubular part to be clamped is provided with a step structure, the step structure is provided with a circle of inclined holes which penetrate through to the central cavity of the part, and the outer end face of the step structure is provided with two circles of grooves.

Under the clamping state, the screw rod 5 penetrates through the tubular part, the two pressing covers are respectively matched with the two end faces of the tubular part, the inner surface of the sealing ring 4 is matched with the conical section on the screw rod 5, the outer surface of the sealing ring 4 blocks one circle of inclined hole end faces on the inner wall face of the tubular part, and the two ends of the sealing ring are screwed by the embossing handles 9.

The gland blocks the inner ring groove on the step structure.

The inner side of the gland is provided with a section of convex structure which extends into the inner cavity of the tubular part, and the sealing ring 4 is compressed under the combined action of the convex structure of the gland and the conical section on the screw rod 5 in a clamping state.

The clamping step is as follows: firstly, a screw rod 5 is sleeved with a sealing ring 4 and is arranged in an inner cavity of a part, and the sealing ring 4 is blocked in an inclined hole of the inner cavity; secondly, a sealing ring, a gland, a sealing gasket and an embossing handle 9 are sequentially arranged at the big end of the part and screwed tightly; and thirdly, sequentially arranging a sealing ring, a gland, a sealing gasket and an embossing handle 9 at the small end of the part and screwing.

A method of localized electroless plating of tubular parts comprising: fixing the part and the tool according to the clamping steps, hoisting the part and the tool to the groove by using a hoisting ring for plating, dismantling the tool after plating, coating the part by using an adhesive tape and exposing the small end, inserting a rubber plug into the port of the small end, and removing a plating layer on the outer circumference of the small end.

The invention has the beneficial effects that:

(1) the pre-plating protection method thoroughly solves the problem that the local nickel plating and nickel removal of parts are difficult. And simultaneously, the problem that the size of the inner cavity is influenced by acid liquor corrosion in the earlier process flow is solved.

(2) After the nickel is removed in the original process flow, whether the nickel layer in the inner cavity of the part is completely removed is difficult to judge, and the incomplete removed nickel layer can influence the working state of the part; the inner cavity is protected by the tool without nickel plating layer, thus thoroughly eliminating the hidden trouble.

(3) The defect that time consumption is long when a gluing and waxing insulation mode is adopted in the early stage is effectively overcome by using a special tool protection method.

(4) Avoid the harm of waxing and gluing solution to the health of operators. The wax coating and the gluing solution have certain toxicity, and the protection method can effectively avoid the harm of the gluing solution to human bodies.

(5) The new tool is mainly made of stainless steel and organic silica gel, is low in price, can be recycled, has no influence on chemical nickel plating of parts, and reduces the use of auxiliary materials.

(6) The protective glue in the inclined hole is difficult to clean in the original process method, and the part is easy to scratch by using a sharp tool; the method is very convenient and fast to remove the insulating adhesive tape and the silica gel plug after nickel removal is finished, and is simple to operate.

(7) The parts and the rod parts can be prevented from colliding with each other in the process of machining after the existing tool is protected, so that the parts are damaged or the rod parts are partially free of nickel layers.

(8) The tool can save the nickel removing period for 1 day, the qualification rate of the existing part for removing nickel at the small end is 100 percent, and the product quality is greatly improved.

(9) The original process method needs vacuum heat treatment, polishing and other procedures after the leakage of the nickel layer is removed, the processing period and the cost are greatly improved, and the cost of the leakage removal rework is effectively prevented by the existing process method.

Drawings

FIG. 1 is a schematic structural diagram of a part to be plated with nickel.

Fig. 2 is a schematic structural diagram of the part and the tool after being installed in a matching manner.

Detailed Description

Example 1:

as shown in fig. 1, the outer pipe wall of the large end of the tubular part to be clamped is provided with a step structure, the step structure is provided with a circle of inclined holes penetrating to the central cavity of the part, and the outer end face of the step structure is provided with two circles of grooves. The E, F, H and V surfaces are required to be subjected to chemical nickel plating, no nickel layer is allowed on the N, U, K and W surfaces, and the nickel layer is allowed on the other surfaces, so that the method belongs to the field of local chemical nickel plating; because the part shape is comparatively complicated, has a plurality of muscle and a plurality of inclined hole of round, and the platform H that links to each other with the inclined hole requires chemical nickel plating, and nickel plating protection is difficult. Therefore, a protection tool is designed:

the utility model provides a protection frock of local chemical plating of tubulose part, includes screw rod 5, and screw rod 5 is a step shaft, and both ends respectively have one section screw thread section and knurling handle 9 cooperation, and knurling handle 9 inboard is equipped with the gland, and the gland cover is on screw rod 5, and the neck cover of the first half section of screw rod 5 is equipped with sealing ring 4. The gland is divided into a small gland 2 and a large gland 9, the design is that the large gland 9 needs to protect the end face of the small end of the part completely, and the small gland 2 only needs to protect the end face of the end of the part locally. The clamp material adopts stainless steel and organic silicon rubber, and the silicon rubber is used as an inner cavity and two ends to be compressed and sealed (a sealing ring 4 and a gland).

A sealing gasket 8 is arranged between the embossing handle 9 and the gland, a sealing ring 6 is arranged on the inner side of the large gland 9, and a small sealing ring 3 is arranged on the inner side of the small gland.

The screw rod 5 is sequentially provided with a thread section, a gland mounting section, a sealing ring mounting section, a middle section, a gland mounting section and a thread section from top to bottom, and transition shaft shoulders are arranged among the thread section, the gland mounting section and the sealing ring mounting section.

The mounting section of the sealing ring is conical, a positioning shaft shoulder is arranged at the junction of the conical section and the middle section, and the inner surface of the sealing ring 4 is conical. The size of the tapered section is slightly larger than the size of the inner wall surface of the sealing ring 4.

Under the clamping state, the screw rod 5 penetrates through the tubular part, the two pressing covers are respectively matched with the two end faces of the tubular part, the inner surface of the sealing ring 4 is matched with the conical section on the screw rod 5, the outer surface of the sealing ring 4 blocks one circle of inclined hole end faces on the inner wall face of the tubular part, and the two ends of the sealing ring are screwed by the embossing handles 9.

The small gland 2 can block the inner ring groove W on the step structure.

The inner sides of the two glands are provided with a section of protruding structure extending into the inner cavity of the tubular part, the protruding structure of the small gland 2 and the conical section on the screw rod 5 act together to compress the sealing ring 4 in a clamping state, and the protruding structure of the large gland 9 is inserted into the small end of the part and matched with the sealing ring 6 to seal the end face of the small end of the part.

The clamping step is as follows:

firstly, a screw rod 5 is sleeved with a sealing ring 4 and is arranged in an inner cavity of a part, and the sealing ring 4 is blocked in an inclined hole of the inner cavity.

And secondly, sequentially arranging the small sealing ring 3, the small gland 2, the sealing gasket 8 and the embossing handle 9 at the large end of the part, and screwing. The small gland 2 and the conical section axially compress the sealing ring 4 to increase its circumferential dimension to seal the inclined hole.

And thirdly, sequentially arranging a sealing ring 6, a large gland 7, a sealing gasket 8 and an embossing handle 9 at the small end of the part and screwing.

A method of localized electroless plating of tubular parts comprising: fixing the part and the tool according to the clamping steps, hoisting the part and the tool to the groove by using a hoisting ring for plating, dismantling the tool after plating, coating the part by using an adhesive tape and exposing the small end, inserting a rubber plug into the port of the small end, and removing a plating layer on the outer circumference of the small end.

The method has the key points that: use special frock to carry out insulation protection before plating, part inclined hole can effectively be plugged up to sealing ring 4, and the bath solution gets into the part inner chamber when preventing to execute the plating, influences the non-plating surface. The screw rod 5 can effectively and firmly fix the sealing gaskets 8 at the two ends and the sealing ring at the two ends of the part through the large (small) pressing cover and the embossing handle 9 without falling off, thereby preventing the tank liquor from entering the inner cavity from the through holes at the two ends.

The key point is as follows: and (3) performing insulation protection before removing a non-plated N-surface nickel layer (shown in figure 1) of the titanium alloy part after plating, performing insulation protection on the rod part of the part by using a polyvinyl chloride insulation tape, reserving an N surface, and performing insulation protection on the small end by using a silica gel plug. And removing nickel from the parts subjected to insulation protection, and removing the insulation tape and the silica gel plug after nickel removal.

The key points are as follows: 1. the two-time insulation protection mode is convenient and fast, the labor is saved for operators, and the working efficiency is improved. 2. Effectively solves the problem of the quality of the previous plating and then removing. 3. The gluing protective coating which is harmful to human bodies is prevented from being used, and the health of operators is protected.

And clamping the part in a special tool before plating, carrying out integral nickel plating, carrying out protection before N surfaces except the nickel, and carrying out insulation protection on all surfaces except the N surfaces and then carrying out nickel removal.