CN102501020B - Processing method for split outer ring of small and medium-sized thin-walled cross-cylindrical roller slewing bearings - Google Patents

Abstract

The invention discloses a method for machining a separated type outer ring of a small and medium-sized thin-wall crossed cylindrical roller turntable bearing. According to the method, the outer ring of the bearing is machined integrally and is lathed to form two half bodies; and the method comprises the following steps of: a, lathing, namely lathing the outer ring integrally, calculating the allowance of an end face and a roller path according to the size of the outer ring, connecting the two half outer rings partially, lathing the middles of the insides of the two half outer rings to form cutting grooves, and leaving cut-off guiding openings on outer diameters; b, drilling and performing heat treatment, namely drilling the outer ring integrally before performing the heat treatment, and performing the heat treatment integrally after drilling; c, grinding, namely in the processes of initial grinding, performing initial grinding on the outer ring integrally without cutting the outer ring off; before final grinding, performing hard lathing to cut the outer ring off along the cut-off guiding openings on the outer diameters, and marking assorted marks; and polishing a cut-off surface, and connecting the upper half outer ring and the lower half outer ring by using a connecting hole to form an integral outer ring, and performing final grinding. By the method, the problems of high deformation possibility during machining and difficulty in guaranteeing concentricity after assembly are solved.

Description

Processing method for split outer ring of small and medium-sized thin-walled cross-cylindrical roller slewing bearings

technical field

The present invention relates to the processing technology of bearings, and mainly relates to a processing method for the split outer ring of small and medium-sized thin-walled cross cylindrical roller slewing bearings.

Background technique

Small and medium-sized thin-walled crossed cylindrical roller slewing bearings with an outer diameter of D≤500 have a variety of designs. There is a robot bearing with a thin wall thickness due to its use characteristics. The design is mostly considered to have no plug holes for rolling elements, and the outer ring is Split structure, no buckle butt joint, integral quenching form. The advantages of this structure are: a. cheaper bearing steel can be selected; b. increased strength; c. easy assembly. However, this structure also has certain disadvantages: a. Since the outer ring is thin and easy to deform in the axial direction after being separated, it is difficult to process; b. Because the outer ring is a split structure, it is not easy to maintain concentricity after assembly.

The main reason for disadvantage a is that the wall thickness and thickness are relatively thin. This is due to the characteristics of the product structure.

Reason 1 for disadvantage b: There is a gap in the connecting hole; Reason 2: Affected by heat treatment deformation, because the product design requires overall quenching, so all drilling must be completed with drilling before quenching. If separate heat treatment, the upper and lower halves The deformation of the connecting hole of the ring is easy to be inconsistent, resulting in hole misalignment and so on.

Contents of the invention

The purpose of this patent is to provide a method for processing the split outer ring of a small and medium-sized thin-walled cross-cylindrical roller slewing bearing, which is used to solve the problems of easy deformation during processing and difficulty in ensuring concentricity after assembly.

The present invention can be realized by adopting the following technical scheme: the outer ring of the bearing is processed as a whole and then cut into two halves. The processing process is as follows:

a: Turning process: the outer ring is machined as a whole. Firstly, the end face and the raceway allowance are calculated according to the size of the outer ring. At the same time, the two halves of the outer ring are only partially connected, and the inner intermediate car is cut out, and the outer diameter is cut off. Lead port, in order to cut off the hard car.

b: Drilling and heat treatment process: The outer ring is drilled as a whole before heat treatment, and heat treated as a whole after drilling.

c: Grinding process: In the initial grinding process, the outer ring is not cut off temporarily, but is carried out as a whole, which is easy to process and guarantees precision; before final grinding, cut off the lead along the outer diameter by hard turning and make a matching mark; cut off Surface grinding; After grinding the cut surface, after finding the correct position along the marking line, put the pins in the positioning hole to align the upper and lower pieces, and use the connecting hole to connect the upper and lower parts into a complete circle before performing the final grinding process, which can better Guarantee the position requirements of the raceway and various accuracy requirements.

The invention is mainly used for processing small and medium-sized cross cylindrical roller slewing bearings with thin walls, no plug holes for rolling bodies, split structure of the outer ring, no stop butt joint, and integral quenching form. This patented technology adopts integral turning and partial grinding, which can not only strengthen the strength of the product, but also help to ensure the accuracy of turning and grinding. At the same time, it can achieve the consistency of drilling and heat treatment deformation, which speeds up the product process and solves the problem. It solves the problems of easy deformation during processing and difficult concentricity of the outer ring.

Description of drawings

Attached Figure 1 is a schematic diagram of the structure of a small and medium-sized crossed cylindrical roller slewing bearing.

Accompanying drawing 2 is the plan view of Fig. 1.

Accompanying drawing 3 is the sectional view of A-A among Fig. 2.

Accompanying drawing 4 is outer ring turning figure

Accompanying drawing 5 is the structure diagram of upper half outer ring.

Accompanying drawing 6 is the plan view of Fig. 5.

Accompanying drawing 7 is the schematic diagram of the structure of the lower half of the outer ring.

Accompanying drawing 8 is the plan view of Fig. 7.

In the figure: 1. Inner ring, 2. Upper half outer ring, 3. Lower half outer ring, 4. Cylindrical roller, 5. Connecting screw, 6. Positioning hole, 7. Positioning pin, 8. Connecting hole, 9. Mounting holes.

Detailed ways

Specific embodiments of the present invention are described with reference to the accompanying drawings.

As shown in the accompanying drawing, it is a structural schematic diagram of a small and medium-sized thin-walled crossed cylindrical roller slewing bearing, which includes an inner ring 1, an upper half outer ring 2, a lower half outer ring 3, cylindrical rollers 4, and the upper and lower half outer rings are connected by Hole 8 and connection screw 5 are connected, and positioning hole 6 is arranged on the upper and lower half circles, and positioning pin 7 is packed inside, and the purpose is to make the upper and lower half circles location alignment, and mounting hole 9 is used for being connected with other parts.

The outer ring of the above-mentioned bearing adopts the processing method of first integral processing and then turning into two halves. The processing method is as follows:

a: Turning process: the outer ring is machined as a whole.

Key point 1: Calculate the end face and raceway allowance, and the mutual conversion relationship between them;

Key point 2: The outer rings of the two halves are only partially connected, the inner middle car has a cut-off groove, and the outer diameter is left with a cut-off guide to facilitate hard car cut-off.

b: Drilling and heat treatment process: the outer ring is drilled as a whole before heat treatment, including installation holes, connection holes, positioning holes, etc., and the positioning holes can be made into asymmetric distribution without affecting the performance, which is easy to cut after The upper and lower parts will not be misaligned. Heat treatment is carried out as a whole after drilling. The arrangement of the process can ensure the consistency of the hole processing position and the consistency of the heat treatment deformation.

c: Grinding process:

Key points: 1. During the initial grinding process, the outer ring is not cut off temporarily, but carried out as a whole, which is easy to process and guarantees precision;

2. Before final grinding, cut off the lead along the outer diameter by hard turning and make matching marks;

3. Grinding of the cut surface is required to ensure the flatness of the end surface and other precision requirements;

4. After grinding the cut surface, find the correct position along the marking line, put the pins in the positioning hole to align the upper and lower pieces, and use the connecting hole to connect the upper and lower parts to form a complete circle, and then carry out the final grinding process, which can better ensure The position requirements and various accuracy requirements of the raceway.

Various parameters in the above processing technology can adopt the existing processing technology.

The purpose of the present invention is to protect all changes and improvements within the scope of the present invention, and the present invention is not limited to the above embodiments.

Claims (1)

1. a middle-size and small-size thin-wall crossed cylindrical roller turntable bearing method for machining separated type outer ring, feature is: described bearing outer ring adopts first integral body to process car to break as the processing method of halved body again, and processing method process is as follows:

A: turning process: outer ring, with integral form Vehicle Processing, first calculates end face and raceway allowance according to the size of outer ring, two semi outer rings are only done part connection simultaneously, and bosom car goes out to cut off groove, and external diameter stays to cut off and draws mouth, so that hard car cuts off;

B: boring and Technology for Heating Processing: before the heat treatment of outer ring, integral body is holed, after boring, integral body is heat-treated;

C: grinding technique: preliminary grinding each operation Shi， outer ring wouldn't cut off, and integral body is carried out, is easy to the assurance of processing and precision like this; Before mill, along external diameter cut-out, draw a mouthful hard car and cut off and carry out supporting mark eventually; Section reconditioning; After the good section of reconditioning, along mark line, look for contraposition postpone, at locating hole, pack pin fluctuating plate centering into, and will connect up and down for after whole circle and carry out whole grinder order with connection holes, can guarantee preferably like this status requirement and every required precision of raceway, the invention solves the yielding and rear concentric problem of assurance that is difficult for of assembling of processing.

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