CN104625020B - Thermometal thrust bearing bronze sheet and steel base forming process - Google Patents

Abstract

The invention discloses a process for forming a bronze plate and a steel base of a bimetallic thrust bearing, which sequentially includes the following processes: preparing a bearing blank of the steel base; The pouring trough of the central axis is cleaned, hot-tinned, and dried; several ring grooves with a spacing of 3 to 4 mm and a peak height of 0.8 to 1.2 mm are cut out on the inner bottom of the pouring trough, and the pouring trough is filled with thick Fusible borax of 5-25mm; place the bearing blank in a heating furnace at 950-970°C, heat it to 950-1050°C after 10-35 minutes, take out the bearing blank and place it in a molten borax environment and finish it by hot-dip tinning Bronze pouring is carried out within the next 24 hours to form the bronze plate of the thrust bearing. The steel base and the bronze plate of the invention have a stronger bonding force, and the process is reasonable, simple and easy to operate, and the operation is convenient; no delamination occurs during the test and use of the product, and the bronze plate and the steel base are measured The adhesion strength between separation and displacement reaches 275MPa and 182MPa respectively.

Description

Bronze Plate and Steel Base Forming Technology of Bimetallic Thrust Bearing

technical field

The invention relates to a forming process of a bronze plate and a steel base of a bimetallic thrust bearing, belonging to the technical field of thrust bearing manufacture.

Background technique

In the traditional bimetallic thrust bearing manufacturing process, brazing is usually used to connect the bronze plate and the bearing steel base on the high-frequency current device. Without a positive result, delamination of the bronze plate from the bearing steel base will occur.

In addition, the existing high-frequency current device cannot ensure effective heating of bearings with a weight of up to 5 kg and a diameter of more than 300 mm, and further cannot ensure the reliable connection between the bronze plate and the bearing steel base. The manufacturing process is improved to ensure the connection strength requirements between the bronze plate and the bearing steel base.

Contents of the invention

Aiming at the deficiencies in the above-mentioned prior art, the present invention aims to provide a bimetallic thrust bearing bronze plate and steel base forming process, which has reasonable process design, convenient operation, and the bronze plate and bearing of the thrust bearing produced The steel base has a strong resultant force, which ensures the connection strength requirements between the bronze plate and the bearing steel base.

In order to achieve the above object, the technical solution of the present invention is: a bimetallic thrust bearing bronze plate and steel base forming process, which includes the following processes in turn: preparing the bearing blank of the steel base; A pouring trough with the same central axis as the bearing blank is provided, cleaned, hot-tinned, and dried; several ring grooves with a spacing of 3-4mm and a peak height of 0.8-1.2mm are cut out on the inner bottom of the pouring trough, and Fill the pouring tank with meltable borax with a thickness of 5-25mm; place the bearing blank in a heating furnace at 950-970°C, heat it to 950-1050°C after 10-35min, take out the bearing blank and place it in the environment of melting borax Within 24 hours after the hot-dip tinning is completed, the bronze casting is carried out to form the bronze plate of the thrust bearing.

Further, the distance between the several ring grooves is 3.5 mm, and the height of the convex peaks is 1 mm.

Further, the cleaning process includes degreasing, pickling, sequentially cleaning in cold and hot water, drying, and then hot-tinning.

Further, the grade of the bronze is ZQCuPb15Sn7.

Further, the bearing blank is cast in bronze within 45s after being taken out.

Further, the temperature for bronze casting is 1100-1150°C.

Beneficial effects of the present invention: Compared with the traditional manufacturing process, there is a stronger bonding force between the steel base and the bronze plate, and the process is reasonable, simple and easy to operate, and no case has occurred during the test and use of the product The delamination phenomenon between the bronze plate and the steel base, through the use of the ring hole drill bit, the sample selected from the product was measured, and the adhesion strength of the separation and displacement between the bronze plate and the steel base reached 275MPa and 182MPa respectively.

detailed description

The present invention will be further described in detail below in conjunction with specific embodiments.

A bimetallic thrust bearing bronze plate and steel base molding process, which includes the following processes in sequence: preparing a steel base bearing blank; on the joint surface of the bearing blank and the bronze plate, a casting that is concentric with the bearing blank is provided. Groove, cleaning, hot-dip tinning, and drying; cut several ring grooves with a pitch of 3-4mm and a peak height of 0.8-1.2mm on the inner bottom of the pouring groove, and fill the casting groove with a thickness of 5-25mm Fusible borax; place the bearing blank in a heating furnace at 950-970°C, heat it to 950-1050°C after 10-35 minutes, take out the bearing blank and place it in the environment of melting borax and 24 hours after the completion of hot-dip tinning Bronze casting is carried out inside to form the bronze plate of the thrust bearing.

During the specific production, firstly, the bearing blank of the steel base is made, that is, the bearing steel base of the thrust bearing, which can be formed by casting. A pouring groove is set on the joint surface of the bearing blank and the bronze plate. The pouring groove can be arranged regularly or irregularly and disorderly on the joint surface. The main binding force, and then cleaning, mainly adopts degreasing, pickling, washing in cold and hot water in sequence, and after drying, cut out several channels on the inner bottom of the pouring tank with a spacing of 3-4mm and a peak height of 0.8-1.2 mm ring groove, as a further bonding force between the bronze plate and the bearing blank, preferably, the distance between several ring grooves is 3.5mm, and the height of the convex peak is 1mm. Fill the pouring tank with fusible borax with a thickness of 5-25mm to protect the tin-plated layer in the bearing blank from being oxidized during the pouring heating process.

Place the bearing blank covered with borax in a heating furnace at a temperature of 950-970°C with a special fixture, heat the temperature to 950-1050°C after 10-35 minutes, take out the bearing blank and cast bronze in a molten borax environment. The bronze grade is ZQCuPb15Sn7, the pouring temperature should be within the range of 1100-1150°C, and the time from taking out the heated bearing blank in the heating furnace to casting the bronze should be as short as possible, not exceeding 45 seconds. Compared with the traditional production process, the steel base and There is a more solid force between the bronze plates, and the process is reasonable, simple and easy to operate, and there is no case of delamination between the bronze plate and the steel base during the test and use of the product.

With the help of ring hole drills, the samples selected from the product have been tested to determine the adhesion strength of the separation and displacement between the bronze plate and the steel base to reach 275MPa and 182MPa respectively, which greatly improves the connection strength between the bronze plate and the bearing steel base , to ensure the technical index requirements of thrust bearings.

The technical solutions provided by the embodiments of the present invention have been introduced in detail above, and the principles and implementation modes of the embodiments of the present invention have been explained by using specific examples in this paper. The descriptions of the above embodiments are only applicable to help understand the embodiments of the present invention At the same time, for those of ordinary skill in the art, according to the embodiment of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be construed as limiting the present invention.

Claims (5)

1. A bimetallic thrust bearing bronze plate and steel base forming process is characterized in that: comprises the following processes in sequence: Prepare a steel-based bearing blank; set a pouring trough concentric with the bearing blank on the joint surface of the bearing blank and the bronze plate, clean the pouring trough, hot-dip tin, and dry; cut out the inner bottom surface of the pouring trough Several ring grooves with a spacing of 3-4mm and a peak height of 0.8-1.2mm, and fill the pouring groove with meltable borax with a thickness of 5-25mm; place the bearing blank in a heating furnace at 950-970°C , after 10 to 35 minutes of heating to a temperature of 950 to 1050°C, take out the bearing blank and place it in a molten borax environment and perform bronze casting within 24 hours after the completion of hot-dip tinning. The temperature for bronze casting is 1100 to 1150°C. Bronze plate forming the thrust bearing. 2. The molding process of the bronze plate and the steel base of the bimetallic thrust bearing according to claim 1, characterized in that the distance between the several ring grooves is 3.5 mm, and the height of the convex peaks is 1 mm. 3. The bimetallic thrust bearing bronze plate and steel base molding process according to claim 1, characterized in that: the cleaning process includes degreasing, pickling, cold and hot water cleaning in sequence, and drying. 4. The bimetallic thrust bearing bronze plate and steel substrate molding process according to claim 1, characterized in that: the grade of the bronze is ZQCuPb15Sn7. 5. The bimetallic thrust bearing bronze plate and steel base molding process according to claim 1, characterized in that: the bearing blank is cast in bronze within 45 seconds after it is taken out.