CN114161730B - A method for manufacturing a polymer material stern tube bearing - Google Patents

Abstract

The invention relates to the technical field of polymer materials, and in particular to a method for manufacturing a polymer material stern tube bearing, comprising the following process steps: raw material pretreatment, raw material mixing, centrifugal casting, bearing material aging treatment, rough machining, assembly, interference fitting of a copper sleeve and a bearing by heating the copper sleeve to form a bearing; seawater soaking, soaking the assembled bearing in a prepared seawater container, fine machining, and fine machining the soaked stern tube bearing to a product size. The process flow of the invention is simple, and the manufactured stern tube bearing has the characteristics of high precision and long service life.

Description

A method for manufacturing a polymer material stern tube bearing

Technical Field

The invention relates to the technical field of polymer materials, and in particular to a method for manufacturing a polymer material stern tube bearing.

Background Art

Bearings are one of the important parts in modern mechanical equipment. Their main function is to support mechanical rotating bodies, reduce the friction coefficient during their movement, and ensure their rotation accuracy. Bearing cages are one of the important components of bearings. Their functions are: (1) to guide and drive the rolling elements to roll on the correct raceway; (2) to separate the rolling elements at equal distances and prevent collision and friction between the rolling elements during operation.

With the continuous development and progress of science and technology, the functions of mechanical equipment are constantly being improved and perfected. As a result, the load on the bearing is getting higher and higher, and the inertia force of the rolling element is getting larger and larger. Therefore, higher requirements are put forward for the pressure bearing capacity of the bearing cage, which needs to have extremely strong tensile strength, bending strength and wear resistance. Most of the existing bearing cages are made of copper alloys (such as brass). Although they have excellent mechanical properties, they are difficult to meet the increasing load requirements of the equipment.

Summary of the invention

In order to solve the above problems, the present invention provides a method for manufacturing a polymer material stern tube bearing, which has the characteristics of high precision and long service life.

The technical solution adopted by the present invention to solve its technical problem is:

The present invention provides a method for manufacturing a polymer material stern tube bearing, comprising the following process steps:

Step S1, pretreatment of raw materials, drying the base material powder and the modified reinforcement material separately in an oven, maintaining the temperature in the oven at 115-125° C., and the pretreatment time is 40-50 minutes;

Step S2, mixing the raw materials, dispersing the dried glass fibers through a mixer, pouring the dried matrix material and the modified reinforcement material into a mixing device after the glass fibers are dispersed, adjusting the speed to 1300-1800 revolutions per minute, mixing the materials, repeating the mixing 1-3 times, each mixing time being 10-20 minutes, to form a mixed raw material;

Step S3, centrifugal casting, loading the mixed raw material into a centrifugal casting mold, controlling the process parameters of the centrifugal casting, and centrifugally casting the mixed raw material to form a bearing shell;

Step S4, aging treatment of the bearing bush material, after the bearing bush is centrifugally cast, it is placed for 8-12 days for aging treatment;

Step S5, rough machining, rough machining the bearing blank after aging treatment, after rough machining, fine machining the outer surface of the bearing to the assembly size, and fine machining the inner surface of the stern bearing copper sleeve to the assembly size;

Step S6, assembling, heating the copper sleeve to perform interference fit between the copper sleeve and the bearing bush to form a bearing;

Step S7, soaking in seawater, placing the assembled bearing in a prepared seawater container and soaking it for 6-8 days. After 6-8 days, take the bearing out of the container and place it for 1 day;

Step S8, finishing: finishing the stern tube bearing after soaking to the product size.

Preferably, in step S1, the oven temperature is maintained at 120° C. and the pretreatment time is 45 minutes.

Preferably, the mixing equipment in step S2 is a mixer with a rotation speed of 1500 revolutions per minute, and the mixing is repeated 3 times, with a single mixing time of 15 minutes.

Preferably, in step S6, the copper sleeve is placed in a heat preservation furnace at a temperature of 230-270° C. for heating for 50-70 minutes. After the heating of the copper sleeve is completed, the bearing bush is pressed into the copper sleeve, and then the assembled stern bearing blank is naturally cooled;

Preferably, the copper sleeve is placed at a temperature of 250° C. and heated for 60 minutes.

The above technical solution of the present invention has the following beneficial technical effects:

The process flow of the invention is simple, and the manufactured stern tube bearing has the characteristics of high precision and long service life.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a process flow chart of the present invention;

FIG. 2 is a process curve diagram of centrifugal casting molding temperature and rotation speed of the present invention.

DETAILED DESCRIPTION

In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

Refer to Figure 1-2.

Embodiment 1,

The present invention provides a method for manufacturing a polymer material stern tube bearing, comprising the following process steps:

Step S1, pretreatment of raw materials, drying the base material powder and the modified reinforcement material separately in an oven, maintaining the oven temperature at 115° C. for 40 minutes;

Step S2, mixing the raw materials, dispersing the dried glass fibers through a mixer, pouring the dried matrix material and the modified reinforcement material into a mixing device after the glass fibers are dispersed, adjusting the speed to 1300 revolutions per minute, mixing the materials, repeating the mixing once, each mixing time being 10 minutes, to form a mixed raw material;

Step S3, centrifugal casting, loading the mixed raw material into a centrifugal casting mold, controlling the process parameters of the centrifugal casting, and centrifugally casting the mixed raw material to form a bearing shell;

Step S4, aging treatment of the bearing bush material, after the bearing bush is centrifugally cast, it is placed for 8 days for aging treatment;

Step S5, rough machining, rough machining the bearing blank after aging treatment, after rough machining, fine machining the outer surface of the bearing to the assembly size, and fine machining the inner surface of the stern bearing copper sleeve to the assembly size;

Step S6, assembling, heating the copper sleeve to perform interference fit between the copper sleeve and the bearing bush to form a bearing; placing the copper sleeve in a heat preservation furnace at a temperature of 230° C. for heating for 50 minutes. After the copper sleeve is heated, the bearing bush is pressed into the copper sleeve, and then the assembled stern bearing blank is naturally cooled;

Step S7, soaking in seawater, placing the assembled bearing in a prepared seawater container and soaking it for 6 days. After 6 days, take the bearing out of the container and place it for 1 day;

Step S8, finishing: finishing the stern tube bearing after soaking to the product size.

Example 2

The present invention provides a method for manufacturing a polymer material stern tube bearing, comprising the following process steps:

Step S1, pretreatment of raw materials, drying the base material powder and the modified reinforcement material separately in an oven, maintaining the oven temperature at 125° C. for 50 minutes;

Step S2, mixing the raw materials, dispersing the dried glass fibers through a mixer, pouring the dried matrix material and the modified reinforcement material into a mixing device after the glass fibers are dispersed, adjusting the speed to 1800 revolutions per minute, mixing the materials, repeating the mixing twice, each mixing time being 20 minutes, to form a mixed raw material;

Step S3, centrifugal casting, loading the mixed raw material into a centrifugal casting mold, controlling the process parameters of the centrifugal casting, and centrifugally casting the mixed raw material to form a bearing shell;

Step S4, aging treatment of the bearing bush material, after the bearing bush is centrifugally cast, it is placed for 2 days for aging treatment;

Step S5, rough machining, rough machining the bearing blank after aging treatment, after rough machining, fine machining the outer surface of the bearing to the assembly size, and fine machining the inner surface of the stern bearing copper sleeve to the assembly size;

Step S6, assembling, heating the copper sleeve to perform interference fit between the copper sleeve and the bearing bush to form a bearing; placing the copper sleeve in a heat preservation furnace at a temperature of 270° C. for heating for 70 minutes. After the copper sleeve is heated, the bearing bush is pressed into the copper sleeve, and then the assembled stern bearing blank is naturally cooled;

Step S7, soaking in seawater, placing the assembled bearing in a prepared seawater container and soaking for 8 days. After 8 days, take the bearing out of the container and place it for 1 day;

Step S8, finishing: finishing the stern tube bearing after soaking to the product size.

Example 3

The present invention provides a method for manufacturing a polymer material stern tube bearing, comprising the following process steps:

Step S1, pretreatment of raw materials, drying the base material powder and the modified reinforcement material separately in an oven, maintaining the temperature in the oven at 120° C. for 45 minutes;

Step S2, mixing the raw materials, dispersing the dried glass fibers through a mixer, pouring the dried matrix material and the modified reinforcing material into a mixing device after the glass fibers are dispersed, adjusting the speed to 1500 revolutions per minute, mixing the materials, repeating the mixing 3 times, each mixing time being 15 minutes, to form a mixed raw material;

Step S3, centrifugal casting, loading the mixed raw material into a centrifugal casting mold, controlling the process parameters of the centrifugal casting, and centrifugally casting the mixed raw material to form a bearing shell;

Step S4, aging treatment of the bearing bush material, after the bearing bush is centrifugally cast, it is placed for 10 days for aging treatment;

Step S5, rough machining, rough machining the bearing blank after aging treatment, after rough machining, fine machining the outer surface of the bearing to the assembly size, and fine machining the inner surface of the stern bearing copper sleeve to the assembly size;

Step S6, assembling, heating the copper sleeve to perform interference fit between the copper sleeve and the bearing shell to form a bearing; placing the copper sleeve in a heat preservation furnace at a temperature of 250° C. for heating for 60 minutes. After the copper sleeve is heated, the bearing shell is pressed into the copper sleeve, and then the assembled stern bearing blank is naturally cooled;

Step S7, soaking in seawater, placing the assembled bearing in a prepared seawater container and soaking for 7 days. After 7 days, take the bearing out of the container and place it for 1 day;

Step S8, finishing: finishing the stern tube bearing after soaking to the product size.

In this embodiment, the process parameters of step S3 are shown in Figure 2. It should be noted that the lower line in Figure 2 is the temperature, and the upper line is the rotation speed.

The interference of the outer surface of the bearing shell and the inner surface of the stern bearing copper sleeve after fine machining in step S5 is shown in the following table:

Outer diameter Interference value ≤150 0.10～0.12 ≤250 0.12～0.14 ≤350 0.14～0.16 ≤450 0.16～0.18 >450 0.18～0.20

The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims (1)

1. A method for manufacturing a polymer stern tube bearing, characterized by comprising the following process steps: Step S1, pretreatment of raw materials, drying the base material powder and the modified reinforcement material separately in an oven, maintaining the temperature in the oven at 120° C. for 45 minutes; Step S2, mixing the raw materials, dispersing the dried glass fibers through a mixer, pouring the dried matrix material and the modified reinforcing material into a mixing device after the glass fibers are dispersed, adjusting the speed to 1500 revolutions per minute, mixing the materials, repeating the mixing 3 times, each mixing time being 15 minutes, to form a mixed raw material; Step S3, centrifugal casting, loading the mixed raw material into a centrifugal casting mold, controlling the process parameters of the centrifugal casting, and centrifugally casting the mixed raw material to form a bearing shell; Step S4, aging treatment of the bearing bush material, after the bearing bush is centrifugally cast, it is placed for 8-12 days for aging treatment; Step S5, rough machining, rough machining the bearing blank after aging treatment, after rough machining, fine machining the outer surface of the bearing to the assembly size, and fine machining the inner surface of the stern bearing copper sleeve to the assembly size; Step S6, assembling, heating the copper sleeve to perform interference fit between the copper sleeve and the bearing bush to form a bearing; In step S6, the copper sleeve is placed in a heat preservation furnace at a temperature of 250° C. for heating for 60 minutes. After the copper sleeve is heated, the bearing bush is pressed into the copper sleeve, and then the assembled stern bearing blank is naturally cooled; Step S7, soaking in seawater, placing the assembled bearing in a prepared seawater container and soaking it for 6-8 days. After 6-8 days, take the bearing out of the container and place it for 1 day; Step S8, finishing: finishing the stern tube bearing after soaking to the product size.