CN112276475A

CN112276475A - Magnet assembling tool and assembling process matched with liquid nitrogen cold-charging technology for application

Info

Publication number: CN112276475A
Application number: CN202011184553.9A
Authority: CN
Inventors: 骆宙; 王杰
Original assignee: Yingpu Aviation Technology Co Ltd
Current assignee: Yingpu Aviation Technology Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-01-29

Abstract

The invention relates to a magnet assembly tool and an assembly process matched with a liquid nitrogen cooling technology for application, wherein the magnet assembly tool comprises a bottom plate and a pressure lever positioned above the bottom plate, the middle part of the bottom plate is provided with a first positioning pin, and the side part of the bottom plate is provided with two second positioning pins; the compression bar comprises a rod part and a positioning disc on the rod part, wherein the middle part of the positioning disc is provided with a positioning block, and the side part of the positioning disc is provided with two third positioning pins; and a magnet is arranged at the upper end of the pressure lever. The assembly process of the magnet assembly tool and the liquid nitrogen cooling assembly technology is matched and applied, so that the manufacturing cost is low, the operation is simple and convenient, and the assembly efficiency and the size of parts are high and stable by using the tool and the liquid nitrogen cooling assembly.

Description

Magnet assembling tool and assembling process matched with liquid nitrogen cold-charging technology for application

Technical Field

The invention relates to a magnet assembling tool and an assembling process matched with a liquid nitrogen cold-charging technology for application, and belongs to the technical field of tool equipment.

Background

For a steel bearing sleeve with a special structure, the bearing sleeve cannot be fixed on an assembly tool due to the fact that the bearing sleeve is influenced by gravity. The traditional assembly method cannot realize and solve the problem of the assembly rotation relation between the bearing sleeve and the seat body. In addition, for the seat body with large interference of the bearing sleeve, the interference required by the seat body made of a softer material is cut by the seat body made of a harder material in a normal state through press fitting, so that the pressing force is lost. Through a traditional hard pressing method, on one hand, a seat body is damaged to a great extent, and on the other hand, a series of problems that pressing force is large due to large interference of a bearing sleeve, the bearing sleeve cannot be assembled to the bottom, assembling speed is low and the like exist.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a magnet assembly tool and an assembly process matched with a liquid nitrogen cold-charging technology for application, wherein the magnet assembly tool is stable in processing, and the assembly qualification rate and the production efficiency of parts are greatly improved.

According to the technical scheme provided by the invention: a magnet assembling tool comprises a bottom plate and a pressure lever positioned above the bottom plate, wherein a first positioning pin is arranged in the middle of the bottom plate, and two second positioning pins are arranged on the side part of the bottom plate; the compression bar comprises a rod part and a positioning disc on the rod part, wherein the middle part of the positioning disc is provided with a positioning block, and the side part of the positioning disc is provided with two third positioning pins; and a magnet is arranged at the upper end of the pressure lever.

Further, the first positioning pin is a disk type.

Further, the magnet is a neodymium iron boron magnet.

An assembly process for matching and applying a magnet assembly tool and a liquid nitrogen cooling technology comprises the following steps:

the method comprises the following steps:

step 1: before installation, the seat body and the bearing sleeve are completely blown by an air gun, and scrap iron and stains are not allowed to be left.

Step 2: and (3) putting the seat body into a stress relief furnace for heating at the temperature of 149-160 ℃, and keeping the temperature for 45-75 minutes, wherein the temperature is required to be kept all the time before assembly.

Step two:

step 1: and putting the bearing sleeve into the heat preservation basin.

Step 2: opening the liquid nitrogen tank, pouring a proper amount of liquid nitrogen into the heat preservation basin, ensuring that the liquid level of the liquid nitrogen is always at least 3cm higher than the bearing sleeve, allowing the liquid nitrogen to be supplemented at any time in the process, keeping the basin body static, and covering a glass cover. And keeping the bearing sleeve at the temperature of between 168 ℃ below zero and 212 ℃ for at least 5 minutes.

Step three:

step 1: the seat body is taken out by using heat insulation gloves and is arranged on the tool.

Step 2: and a third positioning pin of the pressing rod is pressed into a threaded hole of the seat body quickly to align the direction of the seat body.

And step 3: the bearing sleeve in the liquid nitrogen basin is taken out by the iron hook, the bearing sleeve is quickly sleeved on the pressure rod by the heat insulation gloves, the bearing sleeve is quickly pressed into the base body until the base body is completely attached, if the bearing sleeve cannot be easily pressed, the base body and the bearing sleeve are put back again for heat preservation, and the bearing sleeve cannot be forcibly pressed into the bearing sleeve. Each assembly was completed in 30 seconds.

Step four:

whether the surfaces of the assembly parts are completely attached or not is visually detected, and only the completely attached parts can be continuously circulated.

Step five:

and placing the assembled parts in a room temperature environment until the parts recover to the normal temperature.

Compared with the prior art, the invention has the following advantages:

1. reasonable in design, simple structure, manufacturing cost is lower, and is easy and simple to handle, uses the application of this type of frock and liquid nitrogen cooling assembly, makes the part assembly efficiency high, and the size is stable.

2. The processing is stable, and the assembly qualification rate of parts is greatly improved.

Drawings

Fig. 1 is a schematic view of the present invention in use.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a schematic view of the pressure lever and the bearing housing.

Fig. 4 is a schematic view of the base plate and the base body.

Description of reference numerals: 1-bottom plate, 2-second positioning pin, 3-pressure rod, 4-rod part, 5-positioning plate, 6-positioning block, 7-third positioning pin, 8-magnet, 9-first positioning pin, 10-bearing sleeve and 11-seat body.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 3 to 4, the magnet assembling tool comprises a bottom plate 1 and a pressure lever 3 located above the bottom plate 1, wherein a disc-shaped first positioning pin 9 is arranged in the middle of the bottom plate 1, and two second positioning pins 2 are arranged on the side parts of the bottom plate 1; the compression bar 3 comprises a rod part 4 and a positioning disc 5 on the rod part, wherein a positioning block 6 is arranged in the middle of the positioning disc 5, and two third positioning pins 7 are arranged on the side part of the positioning disc; and a neodymium iron boron magnet 8 is arranged at the upper end of the pressure lever 3.

the method comprises the following steps:

step 1: before installation, the seat body 11 and the bearing sleeve 10 are blown clean by an air gun, and scrap iron and dirt are not allowed to remain.

Step 2: and (3) putting the seat body 11 into a stress relief furnace for heating at the temperature of 149-160 ℃, and keeping the temperature for 45-75 minutes, wherein the temperature is kept all the time before assembly.

Step two:

step 1: the bearing housing 10 is placed into a heat-insulating basin.

Step 2: opening the liquid nitrogen tank, pouring a proper amount of liquid nitrogen into the heat preservation basin, ensuring that the liquid level of the liquid nitrogen is always at least 3cm higher than the bearing sleeve 10, allowing the liquid nitrogen to be supplemented at any time in the process, keeping the basin body static, and covering a glass cover. The bearing housing 10 is held at-168 ℃ to-212 ℃ for at least 5 minutes.

Step three:

step 1: the seat body 11 is taken out by using heat insulation gloves and is arranged on the tool.

Step 2: the third positioning pin 7 of the pressing rod 3 is pressed into the threaded hole of the seat body 11 quickly, and the direction of the seat body 11 is aligned.

And step 3: the bearing sleeve 10 in the liquid nitrogen basin is taken out by an iron hook, the bearing sleeve 10 is quickly arranged on the pressure lever 3 by using the heat insulation gloves, the bearing sleeve 10 is quickly pressed into the seat body 11 until the seat body 11 is completely attached, if the seat body 11 and the bearing sleeve 10 can not be easily pressed, the seat body 11 and the bearing sleeve 10 are placed back again for heat preservation, and the bearing sleeve 10 can not be forcibly pressed into. Each assembly was completed in 30 seconds.

Step four:

Step five:

The press rod 3 is arranged on a drilling machine of Z5125A, the tool is placed on a worktable, the base body 11 is limited by the first positioning pin 9 and the second positioning pin 2, and the base body 11 is arranged on the tool. After the bearing sleeve 10 is placed in liquid nitrogen for cooling, the position of the bearing sleeve is limited by the two third positioning pins 7 and the end part of the pressure rod, then the seat body 11 is fixed on the pressure rod 3 through the neodymium iron boron magnet 8, after the hole positions of the bearing sleeve 10 and the seat body 11 are aligned, the tool is fixed on a working table through screws, and then the seat body 11 can be assembled in batches. The processing is stable and the efficiency is high.

The working principle is as follows:

as shown in fig. 1 to 2, according to the requirement of the hole site of the seat body 11, the position of the corresponding positioning pin is designed on the pressure lever to limit the position of the bearing sleeve 10, so that the position of the bearing sleeve is consistent with the requirement of the hole site of the seat body 11.

The liquid nitrogen is liquefied nitrogen gas, is a special industrial product, is widely applied to manufacturing, industrial and agricultural production such as medicines and foods, and daily life, and is mainly a freezing storage medium. The liquid nitrogen is from air, can be recycled and has no pollution. We use the property of the metal housing 11 material that linear expansion under cryogenic conditions causes dimensional shrinkage, and for bearing sleeves 10 with large interference fits we refer to liquid nitrogen in the interference fit.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. The magnet assembling tool is characterized by comprising a bottom plate (1) and a pressure lever (3) positioned above the bottom plate (1), wherein the middle part of the bottom plate (1) is provided with a first positioning pin (9), and the side part of the bottom plate is provided with two second positioning pins (2); the compression bar (3) comprises a rod part (4) and a positioning disc (5) on the rod part, wherein the middle part of the positioning disc (5) is provided with a positioning block (6), and the side part of the positioning disc is provided with two third positioning pins (7); and a magnet (8) is arranged at the upper end of the pressure lever (3).

2. The magnet assembling tool according to claim 1, wherein the first positioning pin (9) is disc-shaped.

3. The magnet assembly tool according to claim 1, characterized in that the magnet (8) is a neodymium iron boron magnet.

4. The assembly process for the magnet assembly tool and the liquid nitrogen cooling technology in matched application is characterized by comprising the following steps of:

the method comprises the following steps:

step 1: before installation, the seat body (11) and the bearing sleeve (10) are blown clean by an air gun, and scrap iron and dirt are not allowed to remain;

step 2: putting the seat body (11) into a stress relief furnace for heating at the temperature of 149-160 ℃, and keeping the temperature for 45-75 minutes, wherein the temperature is required to be kept all the time before assembly;

step two:

step 1: putting the bearing sleeve (10) into a heat-preservation basin;

step 2: opening a liquid nitrogen tank, pouring a proper amount of liquid nitrogen into the heat preservation basin, ensuring that the liquid level of the liquid nitrogen is always at least 3cm higher than the bearing sleeve (10), allowing the liquid nitrogen to be supplemented at any time in the process, keeping the basin body static, and covering a glass cover;

maintaining the bearing housing (10) at-168 ℃ to-212 ℃ for at least 5 minutes;

step three:

step 1: the seat body (11) is taken out by using heat-insulating gloves and is arranged on a tool;

step 2: quickly pressing a third positioning pin (7) of the pressing rod (3) into a threaded hole of the seat body (11) to align the direction of the seat body (11);

and step 3: taking out the bearing sleeve (10) in the liquid nitrogen basin by using an iron hook, quickly installing the bearing sleeve (10) on the pressure lever (3) by using heat-insulating gloves, quickly pressing the bearing sleeve (10) into the base body (11) until the bearing sleeve is completely attached, and if the bearing sleeve cannot be pressed easily, putting the base body (11) and the bearing sleeve (10) back for heat preservation, and not forcibly pressing the bearing sleeve (10);

each assembly needs to be completed within 30 seconds;

step four:

visually detecting whether the surfaces of the assembly parts are completely attached or not, wherein only the completely attached parts can be continuously circulated;

step five: