CN104029001A - Method for assembling screw rod and rolling bearing assembly - Google Patents

Abstract

The invention discloses a method for assembling a lead screw and a rolling bearing assembly. The method includes installing the lead screw flange, installing the rolling bearing, installing the lead screw fixing sleeve, fixing the lead screw flange and the lead screw fixing sleeve, and finally obtaining the assembled lead screw and the rolling bearing assembly, the method is simple and easy to implement, and the assembled screw and rolling bearing assembly are compact, firm and clean. It not only guarantees the horizontal and vertical parallelism between the screw and the linear guide rail of the worktable, the coaxiality between the bearing housing and the ball nut, and the rotation accuracy of the ball screw itself, that is, the radial runout and axial movement accuracy; it can also achieve continuous Lubrication, to avoid the leakage of lubricating oil inside and prevent the entry of external dust, which is conducive to the long-term stable operation of the parts.

Description

A kind of assembly method of lead screw and rolling bearing assembly

technical field

The invention belongs to the field of mechanical manufacturing and assembly, and in particular relates to an assembly method of a lead screw and a rolling bearing assembly.

Background technique

Assembly is the later link in the manufacturing process of injection molding machine products. How to correctly install the various parts that make up the machine together to form a complete product and achieve the desired accuracy is a problem to be solved in production engineering. After carefully designing the assembly method, while ensuring the performance of the machine, the manufacturing cost can be significantly reduced, and the production efficiency can be greatly improved at the same time.

The ball screw in the electric injection molding machine is a precision transmission component. In addition to ensuring the horizontal and vertical parallelism between the screw and the linear guide rail of the worktable, and the coaxiality between the bearing seat and the nut, the ball screw must also be ensured during assembly. The rotation accuracy of the screw itself, that is, the radial runout and axial movement accuracy. Because the ball screw pair only bears the axial load, the radial force and overturning moment will cause the ball screw pair to generate additional surface contact stress and other undesirable loads, resulting in permanent damage. Therefore, designing a reasonable assembly method and realizing the correct installation of the ball screw pair play an important role in determining the performance of the ball screw. In the process of installing the ball screw, it is necessary to strictly control the axial movement of the ball screw to ensure the accuracy of the transmission position; it is also necessary to prevent radial and offset loads to reduce the winding of the screw.

Contents of the invention

The purpose of the present invention is to address the deficiencies in the prior art and provide a method for assembling the screw and the rolling bearing assembly, so that the rolling bearing is installed tightly on the screw in the radial and axial directions, and the support is firm. Blue, lead screw sleeve, rubber sealing ring, gland, etc., contain the rolling bearing in the sealed space with lubricating oil holes.

The purpose of the present invention is achieved by the following technical solutions: a leading screw and rolling bearing assembly assembly method, said leading screw and rolling bearing assembly comprising screw fixed sleeve, rolling bearing, leading screw flange, leading screw sleeve 1, ball nut, Ball screw, gland I, rubber sealing ring I, rubber sealing ring II, gland II, screw cover II, screw I, screw II, screw fixing sleeve oil hole; the ball screw is divided into screw raceway sections Connecting section with lead screw, lead screw flange oil leakage hole is arranged on lead screw flange, gland oil leakage hole is arranged on gland 1; The method comprises the following steps:

(1) Preparations: Clean the self-made parts, including the screw fixing sleeve, the screw flange, the screw sleeve I, the screw sleeve II, the gland I, and the gland II; clean up the assembly site, and put the screw fixing sleeve and The rolling bearing is heated in an oven, the screw fixing sleeve is heated to 130°C, and the rolling bearing is heated to 110°C;

(2) Install screw flange, specifically:

(2.1) Straighten the ball screw so that the connecting section of the screw faces upward;

(2.2) Put the screw sleeve I with the stepped hole in the direction of the big hole facing downwards, and put it on the ball screw;

(2.3) Install the rubber sealing ring I on the lead screw flange, and fix the gland I on the lead screw flange with screws I;

(2.4) Put the screw flange with the rubber sealing ring I and gland I installed from the connecting section of the screw with the gland I facing down, and put it on the ball screw.

(3) Install rolling bearings, specifically:

(3.1) Apply lubricating grease to the part where the rolling bearing is to be installed in the connecting section of the screw;

(3.2) When the rolling bearing is heated to a temperature of 110°C, take out a rolling bearing sleeve and place it on the connecting section of the lead screw, lightly tap the rolling bearing evenly with a hammer to install the rolling bearing in place, and make the side of the inner ring of the rolling bearing close to the end face of the screw sleeve I.

(3.3) When there are multiple rolling bearings, take out other rolling bearings accordingly and install each rolling bearing in place according to the previous step;

(3.4) After installing the rolling bearing, place the ball screw on a clean workbench and let it cool down naturally.

(4) Install the screw fixing sleeve, specifically:

(4.1) After the rolling bearing is cooled down, apply lubricating oil on the outer ring, take out the screw fixing sleeve heated to 130°C, put the bearing hole upwards, and place it on a block of equal height to ensure that the ball screw will not come into contact with it. Lift the ball screw with rolling bearings on the workbench, insert the connecting section of the screw into the screw fixing sleeve vertically, and lightly tap the end of the ball screw with a copper hammer, so that all the rolling bearings enter the screw fixing sleeve , to ensure that the side of the outer ring of the rolling bearing is close to the bottom of the bearing hole of the screw fixing sleeve;

(4.2) Lay the installed ball screw flat to prevent the screw fixing sleeve from slipping off, and let it cool naturally.

(5) Fix the screw flange and the screw fixing sleeve, specifically:

(5.1) After the screw fixing sleeve is cooled, fasten the screw flange and the screw fixing sleeve with screw II;

(5.2) Put the screw sleeve II from the connecting section of the screw and put it on the ball screw;

(5.3) Install the rubber sealing ring II on the screw fixing sleeve, and fix the gland II on the screw fixing sleeve through the screw I to obtain the assembled screw and rolling bearing assembly;

(6) Finish work

(6.1) Place the installed ball screw in a safe and clean place to avoid impact and contamination.

(6.2) Clean up the site and pack up the installation tools.

The beneficial effects of the invention are: the assembling method is simple and easy to realize, and the assembled screw and rolling bearing components are compact, firm and clean. Such an assembly method, on the one hand, ensures the horizontal and vertical parallelism between the screw and the linear guide rail of the worktable, the coaxiality between the bearing seat and the ball nut, and the rotation accuracy of the ball screw itself, that is, radial runout and axial displacement. On the other hand, it can realize continuous lubrication, avoid the leakage of lubricating oil inside, and prevent the entry of external dust, which is conducive to the long-term stable operation of the parts.

Description of drawings

Figure 1 is a schematic diagram of screw flange and rolling bearing assembly;

Fig. 2 is a schematic diagram of fixing sleeve assembly;

Fig. 3 is a schematic diagram of a screw and a rolling bearing assembly;

Among Fig. 1 to Fig. 3: lead screw fixed sleeve 1, rolling bearing 2, lead screw flange 3, lead screw cover 1 4, ball nut 5, ball screw 6, lead screw raceway section 7, lead screw connection section 8, Gland I 9, rubber sealing ring I 10, rubber sealing ring II 11, gland II 12, screw cover II 13, screw flange oil leakage hole 14, gland oil leakage hole 15, screw I 16, screw II 17, lead screw fixing sleeve oil hole 18.

Detailed ways

Below in conjunction with embodiment further illustrate the present invention.

A screw and rolling bearing assembly assembly method of the present invention, said screw and rolling bearing assembly comprises screw fixing sleeve 1, rolling bearing 2, screw flange 3, screw cover 14, ball nut 5, ball screw 6 , Gland I 9, rubber sealing ring I 10, rubber sealing ring II 11, gland II 12, screw cover II 13, screw I 16, screw II 17, screw fixing sleeve oil hole 18. Ball screw 6 is divided into leading screw raceway section 7 and leading screw connection section 8, leading screw flange oil leakage hole 14 is arranged on leading screw flange 3, gland oil leakage hole 15 is arranged on gland 19. The method steps are as follows.

(1) Preparations

(1.1) Selection of parts such as rolling bearings

According to the requirements of load capacity and transmission accuracy, select the appropriate rolling bearing 2 matching the ball screw 6, such as angular contact ball bearings, and ensure the preload of the bearing after installation, such as 50~100 μm . cover to guarantee.

Obtain the parts required for assembly according to the bill of materials, and check carefully to avoid errors in specifications or quantities.

(1.2) Cleaning Homemade Parts

Including cleaning screw fixing sleeve 1, screw flange 3, screw sleeve I 4, screw sleeve II 13, gland I 9, gland II 12 and other self-made parts, cleaning assembly tools to ensure cleanliness. Purchased parts, such as ball screw 6, rolling bearing 2, rubber sealing ring I 10, etc. do not need to be cleaned, and keep the original cleanliness.

(1.3) Clean up the assembly site

Clean up the assembly site to make the environment clean and tidy. Operators wash and dry their hands to ensure cleanliness.

(1.4) Put the rolling bearing 2 into an oven and heat it up to 110°C.

(1.5) Put the cleaned screw fixing sleeve 1 into the oven and heat it up to 130°C.

(2) Install screw flange 3, as shown in Figure 1

(2.1) Straighten the ball screw 6 so that the connecting section 8 of the screw is facing upwards. Note that the ball nut 5 on the ball screw raceway section 7 may rotate and fall due to its own weight, and the ball nut 5 should be prevented from rotating.

(2.2) Put the screw sleeve I 4 with the stepped hole in the direction of the big hole facing down, and put it on the ball screw 6.

(2.3) Install the rubber sealing ring I 10 on the lead screw flange 3, and fix the gland I 9 on the lead screw flange 3 with the screw I 16, pay attention to align the gland oil leakage hole 15 with the lead screw method Lan oil leakage hole 14, and ensure that the lead screw flange oil leakage hole 14 and the screw fixing sleeve oil hole 18 are in the same direction.

(2.4) Put the screw flange 3 with the rubber sealing ring I 10 and the gland I 9 installed from the screw connection section 8 in the direction that the gland I 9 faces downward, and put it on the ball screw 6 .

(3) Install the rolling bearing 2, as shown in Figure 1

(3.1) Apply lubricating grease to the part where the rolling bearing 2 is to be installed on the connecting section 8 of the screw.

(3.2) When the rolling bearing 2 is heated to a temperature of 110°C, quickly take out a rolling bearing 2 and put it on the connecting section 8 of the screw, lightly tap the rolling bearing 2 evenly with a hammer to make the rolling bearing 2 fit in place, and make the side of the inner ring of the rolling bearing 2 stick to the screw Set the end face of I 4.

(3.3) When there are multiple rolling bearings 2, take out other rolling bearings accordingly and install each rolling bearing 2 in place according to the previous step. In this embodiment, two angular contact ball bearings are used. It should be noted that there is a difference between the positive and negative directions of their installation.

(3.4) After installing the rolling bearing 2, place the ball screw 6 flat on a clean workbench and let it cool naturally.

(4) Install screw fixing sleeve 1, as shown in Figure 2

(4.1) After the rolling bearing 2 is cooled, apply lubricating oil on its outer ring, take it out when the screw fixing sleeve 1 is heated to a temperature of 130°C, and place the bearing hole on a block of equal height to ensure that the ball screw 6 Does not touch the workbench. Carefully lift up the ball screw 6 with the rolling bearing 2 installed, insert the connecting section 8 of the screw into the screw fixing sleeve 1 vertically, and lightly tap the end of the ball screw 6 with a copper hammer to make the rolling bearing 2 completely enter the screw. In the fixed sleeve 1 of the screw, ensure that the side of the outer ring of the rolling bearing 2 is close to the bottom of the bearing hole of the fixed sleeve 1 of the screw.

(4.2) Carefully place the installed ball screw 6 horizontally to prevent the screw fixing sleeve 1 from slipping off, and let it cool down naturally.

(5) Fix screw flange 3 and screw fixing sleeve 1, as shown in Figure 3

(5.1) After the screw fixing sleeve 1 is cooled, fasten the screw flange 3 and the screw fixing sleeve 1 with screw II 17.

(5.2) Insert the screw sleeve II 13 from the connecting section 8 of the screw, and put it on the ball screw 6.

(5.3) Install the rubber sealing ring II 11 on the screw fixing sleeve 1, and fix the gland II 12 on the screw fixing sleeve 1 through the screw I 16.

(6) Finish work

(6.1) Place the installed ball screw 6 in a safe and clean place to avoid impact and contamination.

(6.2) Clean up the site and pack up the installation tools.

Claims (1)

1. An assembly method of a leading screw and a rolling bearing assembly, the leading screw and rolling bearing assembly comprising a screw fixing sleeve (1), a rolling bearing (2), a leading screw flange (3), a leading screw sleeve 1 (4), a ball Nut (5), ball screw (6), gland I (9), rubber sealing ring I (10), rubber sealing ring II (11), gland II (12), screw sleeve II (13), Screw I (16), screw II (17), lead screw fixing sleeve oil hole (18); ball screw (6) is divided into screw raceway section (7) and screw connection section (8), screw method There is a screw flange oil leakage hole (14) on the flange (3), and a gland oil leakage hole (15) on the gland I (9); it is characterized in that the method includes the following steps: (1) Preparatory work: Clean the screw fixing sleeve (1), the screw flange (3), the screw sleeve I (4), the screw sleeve II (13), the gland I (9), the gland II ( 12); Put the screw fixing sleeve (1) and the rolling bearing (2) into the oven to heat respectively, the screw fixing sleeve (1) is heated to 130°C, and the rolling bearing (2) is heated to 110°C; (2) Install screw flange (3), specifically: (2.1) Straighten the ball screw (6) so that the connecting section of the screw (8) faces upward; (2.2) Put the screw sleeve I (4) with stepped holes on the ball screw (6); (2.3) Install the rubber sealing ring I (10) on the screw flange (3), and fix the gland I (9) on the screw flange (3) with screws I (16); (2.4) Put the lead screw flange (3) with the rubber sealing ring I (10) and gland I (9) installed in the downward direction of the gland I (9) from the lead screw connection section (8), Put it on the ball screw (6); (3) Install the rolling bearing (2), specifically: (3.1) Apply lubricating grease to the part where the rolling bearing (2) is to be installed on the screw connection section (8); (3.2) When the rolling bearing (2) is heated to a temperature of 110°C, take out a rolling bearing (2) and put it on the connecting section of the screw (8), so that the side of the inner ring of the rolling bearing (2) is close to the screw sleeve I (4) end face; (3.3) When there are multiple rolling bearings (2), take out other rolling bearings accordingly and install each rolling bearing (2) in place according to the previous step; (3.4) After the rolling bearing (2) is installed, the ball screw (6) is placed flat and cooled naturally; (4) Install the screw fixing sleeve (1), specifically: (4.1) After the rolling bearing (2) cools down, apply lubricating oil on its outer ring, take out the screw fixing sleeve (1) heated to 130°C, and place the bearing hole on a block of equal height to ensure that the ball The screw (6) will not touch the workbench, lift the ball screw (6) with the rolling bearing (2) installed, insert the connecting section of the screw (8) vertically downward into the screw fixing sleeve (1), and Make the rolling bearing (2) completely enter the screw fixing sleeve (1), and ensure that the side of the outer ring of the rolling bearing (2) is close to the bottom of the bearing hole of the screw fixing sleeve (1); (4.2) Lay the installed ball screw (6) flat to prevent the screw fixing sleeve (1) from slipping off, and let it cool naturally; (5) Fix the screw flange (3) and the screw fixing sleeve (1), specifically: (5.1) After the screw fixing sleeve (1) is cooled, fasten the screw flange (3) and the screw fixing sleeve (1) with screw II (17); (5.2) Put the screw sleeve II (13) from the screw connecting section (8), and put it on the ball screw (6); (5.3) Install the rubber sealing ring II (11) on the screw fixing sleeve (1), and fix the gland II (12) on the screw fixing sleeve (1) through the screw I (16), and it is assembled screw and rolling bearing assemblies.