Protective sleeve for aluminum piston ceramic plating and production mold assembly thereof

Abstract

The utility model relates to the technical field of piston production and manufacturing, in particular to a protective sleeve for aluminum piston ceramic plating and a production mold assembly of the protective sleeve. The protective sleeve is of a cylindrical structure, the lower portion of the protective sleeve is a skirt portion, the skirt portion is in a horn shape with a downward opening, the upper end of the skirt portion is connected with a straight cylinder, a sealing portion is arranged at the upper end of the straight cylinder, and the sealing portion is of an annular structure contracting inwards. The mold assembly comprises a shell, a mold core and a top cover, and the mold core, the top cover and the shell form a closed cavity used for pressure injection of the protective sleeve. The protective sleeve has the advantages that the sealing portion of the protective sleeve can be installed in the annular groove of the piston, and the skirt portion is protected from participating in the ceramic plating production process. The die assembly can be used for producing the protective sleeves in batches, and due to the fact that the protective sleeves belong to consumable products, the die greatly improves the production efficiency of the protective sleeves.

Description

TECHNICAL FIELD

[0001] The utility model relates to the piston production and manufacturing technical field especially a kind of protective sleeve for aluminum piston plating pottery and the production mould assembly of the protective sleeve. BACKGROUND

[0002] Piston is the core component in engine, and its performance directly affects the overall performance of engine. With the continuous progress of manufacturing technology, more and more piston production enterprises begin to pay attention to and study the application of ceramic coating technology, in order to improve the performance of products through this new material. Ceramic becomes one of the ideal choices due to its excellent high-temperature resistance and pressure resistance, especially in those extremely harsh working environments (such as high temperature and high pressure), applying ceramic coating to piston head can effectively prolong service life and ensure high-efficiency and stable working state even under extreme conditions.

[0003] However, in the process of achieving this goal, there is an important challenge: how to ensure that only the piston head forms a uniform and high-quality ceramic layer, while avoiding any damage to other parts, especially the skirt, because if the entire piston is covered with ceramic, it may cause unnecessary weight increase, cost increase and possible impact on the fitting precision with other components. Therefore, special protective measures need to be taken to shield the parts that do not need to be treated in actual operation.

[0004] There are obvious deficiencies in several methods currently existing on the market for protecting non-target areas from pollution or damage. On the one hand, some high-end solutions provide good protection effect, but due to their high price, they are difficult to be widely adopted; on the other hand, more economical and practical choices often fail to meet the expected protection standard, especially when facing large-scale batch production demand. These problems not only limit the improvement of production efficiency, but also bring additional difficulty to quality control. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of protective sleeve for aluminum piston plating pottery and the production mould assembly of the protective sleeve to solve the problems raised in the above background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A kind of protective sleeve for aluminum piston plating pottery, the protective sleeve is of a cylindrical structure, and its lower part is a skirt, which is a downwardly open horn type. The upper end of the skirt is connected to a straight cylinder, and the upper end of the straight cylinder is provided with a sealing part. The sealing part is an inwardly tapered annular structure, and its cross section is an inwardly tapered wedge-shaped structure. The outer edge of the connection between the sealing part and the straight cylinder is provided with a chamfer, which is an arc chamfer.

[0008] A mold assembly for producing a protective sleeve, comprising: a shell, one side of the shell is provided with a cavity, the shell has two, the cavities of the two shells are combined into a cavity, a mold core, installed in the cavity, a top cover, installed in the cavity, sleeved on the upper end of the mold core, the mold core, the top cover and the shell form a closed cavity, and the cavity is used for pressure injection of the protective sleeve.

[0009] As a further embodiment of the utility model, the side of the shell provided with the cavity is provided with a guide hole, the guide hole has a plurality of, and the guide holes corresponding to the two shells are connected through a guide pin.

[0010] As a further embodiment of the utility model, the bottom of the top cover is provided with a first recess, the first recess is a circular groove, the center of the first recess is further provided with a second recess, the second recess is a circular groove, the top of the mold core is provided with a first boss, the first boss is a circular boss, the center of the first boss is provided with a second boss matched with the second recess, the second boss is a circular boss, and the second boss is inserted into the second recess during installation, used for positioning the center of the top cover and the mold core, and the top surface of the first boss is tightly attached to the bottom surface of the first recess.

[0011] As a further embodiment of the utility model, the outer periphery of the top cover is provided with an annular first positioning rib, the cross section of the first positioning rib is V-shaped, and the cavity is provided with a first positioning groove matched with the first positioning rib.

[0012] As a further embodiment of the utility model, the outer periphery of the bottom of the mold core is provided with an annular second positioning rib, the cross section of the second positioning rib is V-shaped, and the cavity is provided with a second positioning groove matched with the second positioning rib.

[0013] As a further embodiment of the utility model, the bottom surface edge of the first recess is provided with a second profile, the second profile is inclined upward at the edge, the side surface of the first recess is a third profile, the third profile is a tapered surface expanding at the bottom, and the second profile and the third profile are transitioned through an arc-shaped first profile.

[0014] As a further embodiment of the utility model, the outer side of the mold core is provided with a fourth profile corresponding to the skirt portion of the protective sleeve, a fifth profile in a straight tube type is connected above the fourth profile, and a sixth profile in a circular table type is arranged at the connection between the fifth profile and the first boss.

[0015] As a further embodiment of the utility model, the outer side of the shell, the top cover and the mold core is further provided with a handle.

[0016] As a further embodiment of the present application, the mold core is internally provided with a heating source.

[0017] The present application has the advantages that:

[0018] 1. The sealing part of the protective sleeve can be installed in the ring groove of the piston, and the protective skirt does not participate in the ceramic plating production process.

[0019] 2. The application also provides a protective sleeve production mold assembly. The protective sleeve can be mass-produced through the mold. Since the protective sleeve is a consumable product, the mold greatly improves the production efficiency of the protective sleeve.

[0020] Other features and advantages of the present application will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a front view of the piston;

[0022] Figure 2 is a perspective view of the protective sleeve;

[0023] Figure 3 is Figure 1 a cross-sectional view of the protective sleeve in section A;

[0024] Figure 4 is Figure 3 an enlarged view of part B in section C;

[0025] Figure 5 is a structural view of the mold assembly;

[0026] Figure 6 is a perspective view of the shell;

[0027] Figure 7 is a cross-sectional view of the top cover;

[0028] Figure 8 is Figure 7 an enlarged view of part B in section C;

[0029] Figure 9 is a front view of the mold core;

[0030] Figure 10 is a cross-sectional view of the mold assembly;

[0031] Figure 11 is Figure 10 an enlarged view of part C in section C.

[0032] LIST OF REFERENCE NUMBERS:

[0033] protective sleeve 1, skirt 11, straight cylinder 12, sealing part 13, chamfer 14,

[0034] piston 2, ring groove 21,

[0035] mold assembly 3, shell 31, top cover 32, mold core 33, guide pin 34, cavity 35, cavity 311, first positioning groove 312, second positioning groove 313, guide hole 314, first recess 321, second recess 322, first positioning rib 323, first profile 324, second profile 325, third profile 326, fourth profile 331, fifth profile 332, second positioning rib 333, first boss 334, second boss 335, sixth profile 336. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0037] As Figure 1 shown, in order to improve the performance of the piston 2, a ceramic plating process needs to be performed on the head of the piston 2. In order to prevent the non-target area from being contaminated during the process, the ring groove 21 of the piston 2 needs to be protected to prevent contamination. Therefore, the present application provides a protective sleeve 1 for protecting the piston 2.

[0038] As Figure 2 , 3 , 4, a protective sleeve 1 for ceramic plating of an aluminum piston, the protective sleeve 1 is of a cylindrical structure, the lower part of which is a skirt 11, the skirt 11 is a downwardly open horn type, the upper end of the skirt 11 is connected with a straight cylinder 12, the upper end of the straight cylinder 12 is provided with a sealing part 13, the sealing part 13 is an inwardly tapered annular structure, the cross section of the sealing part 13 is a wedge-shaped structure that tapers inwardly, the outer edge of the connection between the sealing part 13 and the straight cylinder 12 is provided with a chamfer 14, and the chamfer 14 is an arc-shaped chamfer.

[0039] In specific work, the sealing part 13 of the protective sleeve 1 is embedded in the ring groove 21 of the piston 2, the skirt 11 of the protective sleeve 1 protects the skirt of the piston 2, and the wedge-shaped sealing part 13 is embedded in the ring groove 21 during installation on one hand, and on the other hand, the cross section of the root of the sealing part 13 is larger than the width of the ring groove 21, so that the entire ring groove 21 can be blocked to prevent the inside of the ring groove 21 from being contaminated during operation.

[0040] As Figure 5As shown, a mold assembly 3 for producing a protective sleeve 1 includes: a shell 31, one side of which is provided with a cavity 311; there are two shells 31, and the cavities 311 of the two shells 31 are combined to form a complete cavity; a mold core 33 is installed in the cavity 311; and a top cover 32 is installed in the cavity 311 and is fitted over the upper end of the mold core 33. The mold core 33, the top cover 32, and the shell 31 form a closed cavity 35, which is used for injection molding of the protective sleeve 1.

[0041] like Figure 6 As shown, in order to prevent misalignment of the outer shell 31 when it is assembled or closed, a guide hole 314 is provided on the side of the outer shell 31 where the cavity 311 is provided. There are multiple guide holes 314, and the guide holes 314 corresponding to two outer shells 31 are connected by a guide pin 34.

[0042] like Figure 7 , 9 As shown, in this embodiment, the bottom of the top cover 32 is provided with a first recess 321, which is a circular groove. A second recess 322 is also provided at the center of the first recess 321, which is also a circular groove. The top of the mold core 33 is provided with a first boss 334, which is also a circular boss. A second boss 335 is provided at the center of the first boss 334 to cooperate with the second recess 322. The second boss 335 is also a circular boss. During installation, the second boss 335 is inserted into the second recess 322 to position the center of the top cover 32 and the mold core 33. At the same time, the top surface of the first boss 334 is in close contact with the bottom surface of the first recess 321.

[0043] like Figure 7 , 6 As shown, in order to position the top cover 32 and the outer shell 31, an annular first positioning rib 323 is provided on the outer periphery of the top cover 32. The cross section of the first positioning rib 323 is V-shaped. The cavity 311 is provided with a first positioning groove 312 that cooperates with the first positioning rib 323. When the two outer shells 31 are closed, the height and axis of the top cover 32 can be positioned.

[0044] like Figure 9 , 6 As shown, in order to position the mold core 33 and the outer shell 31, an annular second positioning rib 333 is provided on the outer periphery of the bottom of the mold core 33. The cross section of the second positioning rib 333 is V-shaped. The cavity 311 is provided with a second positioning groove 313 that cooperates with the second positioning rib 333.

[0045] like Figure 8As shown in the illustration, in a specific embodiment, to ensure that the sealing portion 13 of the produced protective sleeve 1 has a wedge-shaped cross-section, a second profile 325 is provided on the bottom edge of the first recess 321. The second profile 325 is inclined upward at the edge, and the corresponding sealing portion 13 is also inclined upward. This inclination facilitates the root of the sealing portion 13 to fit tightly against the opening of the annular groove 21. The side of the first recess 321 is a third profile 326. To facilitate demolding, the third profile 326 is a tapered surface with an extended bottom. At the same time, the second profile 325 and the third profile 326 are connected by an arc-shaped first profile 324.

[0046] like Figure 9 As shown, in one specific embodiment, the outer side of the mold core 33 is provided with a fourth surface 331 corresponding to the protective skirt 11, and a cylindrical fifth surface 332 is connected above the fourth surface 331. A frustum-shaped sixth surface 336 is provided at the connection between the fifth surface 332 and the first boss 334.

[0047] As one specific implementation, handles are also provided on the outer sides of the outer shell 31, top cover 32 and mold core 33.

[0048] In one specific implementation, a heating source is provided inside the mold core 33. Specifically, during operation, a certain weight of silicone raw material is taken, a portion of which is placed inside a shell. After the top cover and the mold core are fitted together, the material is placed into the cavity 311 of the shell. The remaining silicone raw material is then placed on the mold core. The shell is closed, and the closed mold is placed into a pressing machine. While the pressing machine is in a heated state, the mold core is also heated simultaneously, extruding the mold and forming the silicone sleeve.

[0049] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A protective sleeve (1) for an aluminum piston ceramic-coated with a protective sleeve (1), characterized in that, The protective sleeve (1) is of a cylindrical structure, and its lower part is a skirt (11) which is of a downwardly open horn type, the upper end of the skirt (11) is connected with a straight cylinder (12), the upper end of the straight cylinder (12) is provided with a sealing part (13) which is of an inwardly tapered annular structure, the cross section of the sealing part (13) is of a wedge-shaped structure which is tapered inwardly, the outer edge of the connection between the sealing part (13) and the straight cylinder (12) is provided with a chamfer (14) which is of an arc-shaped chamfer.

2. A mould assembly (3) for producing a protective sleeve (1) according to claim 1, characterised in that It comprises: two housings (31), one side of the housing (31) is provided with a cavity (311), the cavities (311) of the two housings (31) are combined into a cavity, a mold core (33) installed in the cavity (311), a top cover (32) installed in the cavity (311) and sleeved on the upper end of the mold core (33), the mold core (33), the top cover (32) and the housing (31) form a closed cavity (35), and the cavity (35) is used for injection molding of the protective sleeve (1).

3. The mold assembly of claim 2, wherein, The side of the housing (31) provided with the cavity (311) is provided with a guide hole (314), the guide hole (314) has a plurality of guide holes (314), and the corresponding guide holes (314) of the two housings (31) are connected through a guide pin (34).

4. The mold assembly of claim 3, wherein, The bottom of the top cover (32) is provided with a first recess (321), the first recess (321) is a circular groove, and the center of the first recess (321) is further provided with a second recess (322), the second recess (322) is a circular groove, the top of the mold core (33) is provided with a first boss (334), the first boss (334) is a circular boss, and the center of the first boss (334) is provided with a second boss (335) matched with the second recess (322), the second boss (335) is a circular boss, during installation, the second boss (335) is inserted into the second recess (322) for positioning the center of the top cover (32) and the mold core (33), and the top surface of the first boss (334) is tightly attached to the bottom surface of the first recess (321).

5. The mold assembly of claim 4, wherein, The outer periphery of the top cover (32) is provided with an annular first positioning rib (323), the cross section of the first positioning rib (323) is V-shaped, and the cavity (311) is provided with a first positioning groove (312) matched with the first positioning rib (323).

6. The mold assembly of claim 5, wherein, The outer periphery of the bottom of the mold core (33) is provided with an annular second positioning rib (333), the cross section of the second positioning rib (333) is V-shaped, and the cavity (311) is provided with a second positioning groove (313) matched with the second positioning rib (333).

7. The mold assembly of claim 6, wherein, The bottom edge of the first recess (321) is provided with a second profile (325) which is inclined upward at the edge, the side of the first recess (321) is a third profile (326) which is a bottom-expanded conical surface, and the second profile (325) and the third profile (326) are connected through an arc-shaped first profile (324).

8. The mold assembly of claim 7, wherein, The outer side of the mold core (33) is provided with a fourth profile (331) corresponding to the protective sleeve skirt (11), the upper side of the fourth profile (331) is connected with a straight-cylinder-shaped fifth profile (332), and the connection between the fifth profile (332) and the first boss (334) is provided with a round-table-shaped sixth profile (336).

9. The mold assembly of claim 8, wherein, The outer side of the shell (31), the top cover (32) and the mold core (33) is further provided with a handle.

10. The mold assembly of claim 9, wherein, The inner side of the mold core (33) is provided with a heating source.

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