Silicon rubber case for protecting iron-aluminum combined workpiece in hard anodizing process

Abstract

A silicon rubber case for protecting an iron-aluminum combined workpiece in the hard anodizing process comprises a silicon rubber case body, a first sealing ring and a second sealing ring are arranged on the two sides of the silicon rubber case body respectively, and when the silicon rubber case body is connected to a non-aluminum workpiece of the iron-aluminum combined workpiece in a sleeved mode, a protection cavity is formed in the silicon rubber case body. According to the utility model, through the simple structure that the sealing ring is arranged in the silicon rubber case, the surface of a non-aluminum workpiece can be accurately covered only by sleeving the silicon rubber case on the non-aluminum workpiece part of an iron-aluminum combined workpiece, so that the silicon rubber case is tightly attached to the workpiece. Due to the blocking of the sealing rings at the two ends, the sulfuric acid electrolyte cannot break through the sealing rings and enters the protection cavity to erode the non-aluminum workpiece, so that the iron-aluminum combined workpiece meets the delivery standard after being subjected to hard anodic oxidation.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of iron -aluminum combined workpiece surface treatment, especially the silica gel cover for protecting iron -aluminum combined workpiece in hard anodic oxidation process. BACKGROUND

[0002] At present, hard anodic oxidation technology is the more common technology in surface treatment technology, has high film thickness, high hardness and high wear resistance and other remarkable advantages, not only is widely used in the surface treatment of aluminum alloy, also is used in the surface treatment of iron -aluminum combined workpiece.

[0003] For example, an iron -aluminum combined workpiece is composed of an aluminum alloy workpiece with a ring-shaped mounting groove and a ring-shaped non-aluminum workpiece (pure iron workpiece or iron alloy workpiece) assembled in the ring-shaped mounting groove of the aluminum alloy workpiece. After the assembly of the iron-aluminum combined workpiece, due to the difference in thickness between the non-aluminum workpiece and the depth of the mounting groove in the aluminum alloy workpiece, a part of the non-aluminum workpiece will protrude from the surface of the aluminum alloy, resulting in irregular shape of the entire iron-aluminum combined workpiece and uneven surface.

[0004] For such iron-aluminum combined workpiece, hard anodic oxidation is needed first, the iron-aluminum combined workpiece is immersed in sulfuric acid solution, then anodization is carried out by power supply, and finally the aluminum alloy surface of the workpiece generates an oxide film (the thickness of the oxide film should be generally 11±1 μm to meet the factory requirements). However, if metal iron and metal aluminum are in sulfuric acid electrolyte at the same time, Javon effect will occur, resulting in the ablation of metal iron with high potential, not only generating porous and easy-to-fall iron trioxide (red rust), ferrous oxide (yellow rust) and other substances on the surface of pure iron or iron alloy workpiece, but also resulting in the thickness of the oxide film generated by anodic oxidation on the surface of aluminum alloy cannot meet the factory requirements (i.e. the thickness is less than 11±1 μm). Therefore, during the hard anodic oxidation process of such iron-aluminum combined workpiece, the non-aluminum workpiece must be isolated and protected.

[0005] However, the current protection of non-aluminum workpiece in iron-aluminum combined workpiece usually only uses silica gel protective film to wrap the protected parts manually (for example, patent document CN107295772B), so that the silica gel is as close as possible to the surface of the protected parts, which has many disadvantages:

[0006] ① Because the shape of the iron-aluminum combined workpiece is irregular, the surface is uneven, and the silica gel protective film used is larger in area than the workpiece, when the staff member wraps the iron-aluminum combined workpiece with the silica gel protective film to protect the part, it is time-consuming and laborious, and the surface of the aluminum alloy is often covered (the covered area affects the result of anodic oxidation, for example, the covered part cannot generate an oxidation film meeting the requirements), or the surface of the non-aluminum workpiece is not completely covered, and then anodic oxidation is performed, resulting in that the effect of the workpiece after anodic oxidation does not meet the factory requirements;

[0007] ② Even if the staff member spends a lot of time and effort to accurately cover the surface of the non-aluminum workpiece with the silica gel protective film, when the workpiece is immersed in the sulfuric acid electrolyte, sulfuric acid still contacts the non-aluminum workpiece through the gap between the silica gel protective film and the surface of the workpiece, resulting in that the effect of the workpiece after anodic oxidation does not meet the factory requirements;

[0008] How to completely separate the non-aluminum workpiece of the iron-aluminum combined workpiece that needs to be protected from the sulfuric acid solution in the hard anodic oxidation process, so that the iron-aluminum combined workpiece meets the factory standards after hard anodic oxidation, has been a problem to be solved by those skilled in the art. SUMMARY

[0009] The silica gel sleeve for protecting the iron-aluminum combined workpiece in the hard anodic oxidation process is provided by the utility model in the light of the corresponding deficiencies of the prior art, and the silica gel sleeve is provided with a sealing ring inside, so that the surface of the non-aluminum workpiece can be accurately covered only by sleeving the silica gel sleeve on the non-aluminum workpiece part of the iron-aluminum combined workpiece, and the silica gel sleeve is tightly attached to the workpiece. Because the sealing ring blocks the two ends, the sulfuric acid electrolyte cannot break through the sealing ring and erode the non-aluminum workpiece in the protection cavity, so that the iron-aluminum combined workpiece meets the factory standards after hard anodic oxidation.

[0010] The utility model is implemented by adopting the following scheme:

[0011] A silica gel sleeve for protecting an iron-aluminum combined workpiece in a hard anodic oxidation process, comprising a silica gel sleeve body, first and second sealing rings are arranged on the two sides of the silica gel sleeve body, and the silica gel sleeve body is sleeved on the iron-aluminum combined workpiece, so that a protection cavity is formed in the silica gel sleeve body located on the annular non-aluminum workpiece, and the protection cavity is used to block the contact between the electrolyte and the annular non-aluminum workpiece.

[0012] Preferably, the cross sections of the first and second sealing rings are semicircular or rectangular.

[0013] Preferably, the cross sections of the first and second sealing rings are semicircular, and the radius of the semicircle is 1.25-1.35 mm.

[0014] Preferably, the cross section of the first sealing ring and the second sealing ring is rectangular, the length of the rectangle is 1.25-1.35 mm, and the width of the rectangle is 1.25-1.35 mm.

[0015] Preferably, the first sealing ring is arranged on the left side of the silica gel sleeve body, and the distance between the cross section center of the first sealing ring and the left end face of the silica gel sleeve body is 2.45-2.55 mm.

[0016] Preferably, the second sealing ring is arranged on the right side of the silica gel sleeve body, and the distance between the cross section center of the second sealing ring and the right end face of the silica gel sleeve body is 1.7-1.8 mm.

[0017] Preferably, if the outer diameter of the annular non-aluminum workpiece is 36.7 mm, the maximum width of the cross section of the annular non-aluminum workpiece is 7 mm, the diameter of the protection cavity is 32.7 mm, and the maximum width of the cross section of the protection cavity is 8.45 mm.

[0018] Preferably, the film thickness of the silica gel sleeve body is 1.13-1.17 mm.

[0019] Preferably, the sleeve is provided with a protrusion, and the protrusion is located at the right end of the sleeve.

[0020] Preferably, the width of the protrusion is 2.3-2.35 mm, the thickness of the protrusion is 1.95-2.05 mm, and the inner diameter of the protrusion is larger than the inner diameter of the sleeve by 0.25-0.35 mm.

[0021] The beneficial effects of the utility model are as follows:

[0022] The two sides of the silica gel sleeve body are respectively provided with a first sealing ring and a second sealing ring, the silica gel sleeve body is sleeved on the iron-aluminum combined workpiece, the silica gel sleeve body located on the annular non-aluminum workpiece forms a protection cavity, and the protection cavity is used for blocking the contact between the electrolyte and the annular non-aluminum workpiece.

[0023] In this way, during hard anodization, the non-aluminum workpiece to be protected of the iron-aluminum combined workpiece is protected by the silica gel sleeve of the utility model, the non-aluminum workpiece is completely separated from the sulfuric acid solution, and the iron-aluminum combined workpiece meets the factory standard after hard anodization.

[0024] Preferably, the cross section of the first sealing ring and the second sealing ring is semicircular or rectangular. The radius of the semicircular cross section of the first sealing ring and the second sealing ring is 1.25-1.35 mm. The length of the rectangular cross section of the first sealing ring and the second sealing ring is 1.25-1.35 mm, and the width of the rectangular cross section of the first sealing ring and the second sealing ring is 1.25-1.35 mm.

[0025] Different shapes of workpieces, the sealing ring shape is different, the size is different, only the shape and the size match each other, the isolation effect of the silica gel sleeve to the electrolyte can be maximized.

[0026] Even on the same workpiece, the surface shape of the two ends is inconsistent, and the sealing ring shape and size also need to be designed correspondingly, that is, the sealing ring shape and size of the two ends are not completely the same.

[0027] Preferably, the first sealing ring is arranged on the left side of the silica gel sleeve body, and the distance between the cross-section center of the first sealing ring and the left end face of the silica gel sleeve body is 2.45-2.55 mm. The second sealing ring is arranged on the right side of the silica gel sleeve body, and the distance between the cross-section center of the second sealing ring and the right end face of the silica gel sleeve body is 1.7-1.8 mm.

[0028] In this way, the silica gel sleeve can protect the non-aluminum workpiece while avoiding covering the surface of the aluminum alloy which needs to form an oxide film.

[0029] Preferably, if the outer diameter of the annular non-aluminum workpiece is 36.7 mm, the maximum width of the cross section of the annular non-aluminum workpiece is 7 mm, the diameter of the protection cavity is 32.7 mm, the maximum width of the cross section of the protection cavity is 8.45 mm, and the film thickness of the silica gel sleeve body is 1.13-1.17 mm.

[0030] Different volumes of non-aluminum workpieces require different volumes of protection cavities, and the film thickness of the silica gel sleeve body is different, so that there is enough space in the silica gel sleeve to provide effective protection and isolation for the non-aluminum workpiece while ensuring that the silica gel sleeve film has enough elasticity to tightly fit the surface of the non-aluminum workpiece.

[0031] Moreover, since the shapes and sizes of the sealing rings at both ends of the silica gel sleeve are often different, in order to quickly distinguish the difference between the two ends of the silica gel sleeve and correctly install the silica gel sleeve, the utility model is provided with a protrusion on the sleeve body, and the protrusion is located at the right end of the sleeve body.

[0032] While improving the disassembly and installation speed, the protrusion occupies as little space as possible, the width of the protrusion is 2.3-2.35 mm, the thickness is 1.95-2.05 mm, and the inner diameter of the protrusion is larger than the inner diameter of the sleeve body by 0.25-0.35 mm.

[0033] The utility model has the following advantages:

[0034] The utility model discloses a simple structure does not need staff to spend a lot of time and energy to assemble, only need to set the utility model in the non -aluminium workpiece part of iron -aluminium combined workpiece, can accurate cover the surface of non -aluminium workpiece, make silica gel cover and workpiece close adhesion, because the barrier of the sealing ring of both ends, sulfuric acid electrolyte can not break through the sealing ring, enter the protection cavity and form the erosion to non -aluminium workpiece, make iron -aluminium combined workpiece after hard anodization meet factory standard,

[0035] When staff uses the utility model to protect non -aluminium workpiece, will not appear the condition of covering the surface of aluminium alloy (or said, the covering area of aluminium alloy workpiece of the utility model can be almost ignored, and the influence to the result of anodic oxidation is extremely small). DRAWINGS

[0036] Figure 1 It is the structure schematic diagram of the utility model;

[0037] Figure 2 It is the structure schematic diagram of the utility model embodiment iron -aluminium combined workpiece;

[0038] Figure 3 It is the assembly schematic diagram of iron -aluminium combined workpiece and the utility model in the embodiment.

[0039] Markings in the drawings:

[0040] Silica gel cover body 10, first sealing ring 21, second sealing ring 22, protection cavity 23, protrusion 30, aluminium piece 41, aluminium piece tight mouth groove 42, iron piece 43. SPECIFIC EMBODIMENTS

[0041] The left and right described in this paper are Figure 1 The left and right shown.

[0042] As Figure 1 Shown, a kind of silica gel cover for protecting iron -aluminium combined workpiece in hard anodization process, including silica gel cover body 10, the two sides of the silica gel cover body 10 are equipped with first sealing ring 21, second sealing ring 22, set the silica gel cover body 10 on iron -aluminium combined workpiece, make the silica gel cover body 10 located annular non -aluminium workpiece form a protection cavity 23, for blocking electrolyte and annular non -aluminium workpiece contact.

[0043] Usually, the cross section of the first sealing ring 21 and the second sealing ring 22 is semicircular, or rectangular, or even irregular shape, which is to better adhere to the surface of the workpiece. For example, the cross section of the first sealing ring 21 and the second sealing ring 22 is semicircular, and the radius of the semicircle is 1.25-1.35mm.

[0044] Alternatively, the cross-sections of the first sealing ring 21 and the second sealing ring 22 are both rectangular, with a length of 1.25 to 1.35 mm and a width of 1.25 to 1.35 mm.

[0045] It is worth noting that the first sealing ring 21 is located on the left side of the silicone sleeve 10, and the distance between the center of the cross-section of the first sealing ring 21 and the left end face of the silicone sleeve 10 is 2.45–2.55 mm. The second sealing ring 22 is located on the right side of the silicone sleeve 10, and the distance between the center of the cross-section of the second sealing ring 22 and the right end face of the silicone sleeve 10 is 1.7–1.8 mm. This ensures that the silicone sleeve protects non-aluminum workpieces while preventing accidental coverage of aluminum alloy surfaces that require oxide film formation.

[0046] Based on the above, the following is an example:

[0047] A certain type of iron-aluminum composite workpiece requires hard anodizing. The iron-aluminum composite workpiece is as follows: Figure 2 As shown, the aluminum part 41 has a diameter of 35mm, the minimum diameter of the aluminum part groove 42 is 32.9mm, and the maximum diameter of the iron part 43 is 36.7mm, with a width of 7mm.

[0048] To protect the non-aluminum parts of the iron-aluminum composite workpiece during hard anodizing, a silicone sleeve is designed. The specific structure and parameters of the silicone sleeve are as follows:

[0049] A first sealing ring 21 and a second sealing ring 22 are respectively provided on both sides of the silicone sleeve 10. The center of the first sealing ring 21 is located 0.1 mm inside the inner surface of the sleeve 10, the center of the first sealing ring 21 is 2.5 mm from the left end of the sleeve 10, and the radius of the first sealing ring 21 is 1.3 mm. The first sealing ring 21 is vertically connected to the inner surface of the sleeve 10 when the left and right radii are at their maximum. The center of the second sealing ring 22 is located 1.4 mm inside the sleeve 10, the center of the second sealing ring 22 is 1.75 mm from the right end of the sleeve 10, and the radius of the second sealing ring 22 is 1 mm. When the radius is at its maximum, it is vertically connected to the protrusion 30. When the radius is at its maximum on the left side of the center of the second sealing ring 22, it is connected to the inner surface of the sleeve 10 1.5mm to the left of the center of the second sealing ring 22. There is a protective cavity 23 between the first sealing ring 21 and the second sealing ring 22. The diameter of the protective cavity 23 is 31.7mm and the width is 8.45mm. The right end of the silicone sleeve 10 is provided with a protrusion 30. The width of the protrusion 30 is 2.3mm and the thickness is 2mm. The inner diameter of the protrusion 30 is 0.3mm larger than the inner diameter of the sleeve 10. The outer diameter of the sleeve 10 is 34mm, the thickness is 1.15mm and the width is 15.5mm.

[0050] like Figure 3As shown, the iron piece is installed into the mounting groove of the aluminum alloy workpiece, and after the iron-aluminum combined workpiece is assembled, the convex 30 of the silica gel protective sleeve is held in hand, and the silica gel protective sleeve is slid to the iron piece from left to right, the first sealing ring 21 and the second sealing ring 22 are slightly adjusted to be just clamped at both ends of the iron piece, the iron piece is located in the protection cavity 23, and the second sealing ring 22 is located in the aluminum piece tight groove 42, so that the silica gel sleeve and the iron-aluminum combined workpiece are tightly assembled together.

[0051] The comparative experiment is carried out by using the traditional method, and the specific results are as follows:

[0052] ① The traditional silica gel protective film wrapping method:

[0053] The same type of iron-aluminum combined workpiece is wrapped by using the traditional silica gel protective film, after the hard anodizing of the iron-aluminum combined workpiece, there is yellow rust on the iron piece, powder is generated at the joint of the iron piece and the aluminum alloy workpiece, and the thickness of the oxidation film on the surface of the aluminum alloy workpiece is 8mm, which does not meet the factory standard.

[0054] ② The embodiment:

[0055] The iron-aluminum combined workpiece sleeved with the protective sleeve is immersed in a sulfuric acid solution, and then anodized by power supply, after the hard anodizing is completed, the convex 30 is held in hand, and the silica gel protective sleeve is slid out of the iron-aluminum combined workpiece to the right, and the disassembly is completed (the used silica gel protective sleeve can be reused after being washed, saving cost).

[0056] It is found through observation and measurement that there is no sulfuric acid solution on the iron piece of the iron-aluminum combined workpiece, the iron piece does not appear rust phenomenon, no powder is generated at the joint of the iron piece and the aluminum alloy workpiece, and the thickness of the oxidation film on the surface of the aluminum alloy is 12mm, which not only meets the factory requirement, but also reaches the upper limit value of the factory requirement, and the wear resistance is better.

[0057] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and the changes made by those skilled in the art without departing from the spirit of the present application fall within the protection scope of the present application.

Claims

1. A silicone sleeve for protecting iron-aluminum composite workpieces during hard anodizing, characterized in that, The device includes a silicone sleeve (10), with a first sealing ring (21) and a second sealing ring (22) on both sides. The silicone sleeve (10) is fitted onto the iron-aluminum composite workpiece, so that the silicone sleeve (10) located on the annular non-aluminum workpiece forms a protective cavity (23) to prevent the electrolyte from contacting the annular non-aluminum workpiece. If the outer diameter of the annular non-aluminum workpiece is 36.7 mm, the maximum width of the cross section of the annular non-aluminum workpiece is 7 mm, the diameter of the protective cavity (23) is 32.7 mm, and the maximum width of the cross section of the protective cavity (23) is 8.45 mm.

2. The silicone sleeve according to claim 1, characterized in that, The cross-sections of the first sealing ring (21) and the second sealing ring (22) are both semi-circular, and the radius of the semi-circle is 1.25 to 1.35 mm.

3. The silicone sleeve according to claim 1, characterized in that, The first sealing ring (21) and the second sealing ring (22) are both rectangular in cross-section, with a length of 1.25 to 1.35 mm and a width of 1.25 to 1.35 mm.

4. The silicone sleeve according to claim 1, characterized in that, The first sealing ring (21) is located on the left side of the silicone sleeve (10), and the distance between the center of the cross section of the first sealing ring (21) and the left end face of the silicone sleeve (10) is 2.45 to 2.55 mm.

5. The silicone sleeve according to claim 1, characterized in that, The second sealing ring (22) is located on the right side of the silicone sleeve (10), and the distance between the center of the cross section of the second sealing ring (22) and the right end face of the silicone sleeve (10) is 1.7 to 1.8 mm.

6. The silicone sleeve according to claim 1, characterized in that, The film thickness of the silicone sleeve (10) is 1.13 to 1.17 mm.

7. The silicone sleeve according to claim 1, characterized in that, The sleeve (10) is provided with a protrusion (30), which is located at the right end of the sleeve (10).

8. The silicone sleeve according to claim 7, characterized in that, The width of the protrusion (30) is 2.3 to 2.35 mm, the thickness is 1.95 to 2.05 mm, and the inner diameter of the protrusion (30) is 0.25 to 0.35 mm larger than the inner diameter of the sleeve (10).

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