A disc type positioning tool

Abstract

The present invention provides a disc-type positioning tool, comprising: a rotating mechanism, including a turntable and a driving mechanism, the turntable is connected to the driving mechanism and rotates under the drive of the driving mechanism, the turntable has three working holes evenly distributed on the circumference, each working hole is used to accommodate a workpiece to be processed, and the workpiece to be processed is composed of two semicircular components; a centering component and a chamfering processing component are distributed along the circumference of the turntable, and correspond to two adjacent working holes on the turntable one by one; the centering component includes two centering arms arranged opposite to each other, the two centering arms are respectively located on both sides of the turntable, and when one of the working holes is rotated to the centering component, the two centering arms move toward each other to complete the centering positioning of the workpiece to be processed in the working hole; the chamfering processing component includes a cutting tool, which is used to complete the chamfering processing of the workpiece to be processed in the working hole. The present invention is used to solve the problem that the bearing in the prior art is too slow when processing chamfering and cannot match the processing speed of other production lines.

Description

Technical Field

[0001] The invention relates to the field of bearing bush processing, in particular to a disc type positioning tool. Background Art

[0002] There are many processes in the production of bearings. In order to speed up production efficiency, all processing processes have been automated. In order to ensure that each process cooperates with each other and the entire processing production line is carried out efficiently and stably, the processing speed of each process needs to be consistent. At present, the processing speed of the bearing chamfering device is slow, which seriously affects the speed of the entire production line.

[0003] Therefore, a new chamfering processing device is needed to solve the above problems. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a disc-type positioning tool for solving the problem that the bearing shell in the prior art has a too slow processing speed when chamfering and cannot match the processing speed of other production lines.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a disc-type positioning tool, including: a rotating mechanism, including a turntable and a driving mechanism, the turntable is connected to the driving mechanism and rotates under the drive of the driving mechanism, the turntable is evenly distributed with three working holes in the circumference, each working hole is used to accommodate a workpiece to be processed, and the workpiece to be processed is composed of two semicircular components; a centering component and a chamfering processing component are distributed in an annular direction along the circumference of the turntable, and correspond one to one to two adjacent working holes on the turntable; the centering component includes two centering arms arranged opposite to each other, the two centering arms are respectively located on both sides of the turntable, and when one of the working holes is rotated to the centering component, the two centering arms move toward each other to complete the centering positioning of the workpiece to be processed in the working hole; the chamfering processing component includes a cutting tool, which is used to complete the chamfering processing of the workpiece to be processed in the working hole.

[0006] A production line for processing chamfering, comprising: a disc-type positioning tool; a conveying assembly, comprising a feed conveying line and a discharge conveying line, wherein the outlet end of the feed conveying line and the inlet end of the discharge conveying line are symmetrically arranged relative to the turntable, and a pushing device is arranged at the outlet end of the feed conveying line, for moving the bearing on the feed conveying line to the turntable, and moving the bearing on the turntable that has completed the chamfering process to the discharge conveying line; for every 120° rotation of the turntable, the centering assembly, the chamfering processing assembly and the conveying assembly respectively correspond to a working hole.

[0007] Preferably, a positioning arm moving radially along the turntable is provided on the circumferential outer side of the turntable, and three positioning grooves are equidistantly arranged on the circumference of the turntable. During positioning processing, the positioning arm moves and is inserted into the positioning groove to position the turntable.

[0008] Preferably, a positioning arm that moves radially along the turntable is provided on the circumferential outer side of the turntable, and three mounting holes are equidistantly arranged on the circumference of the turntable. Positioning blocks are fixedly arranged in the three mounting holes, and the positioning blocks have positioning grooves that match the positioning arms. During positioning processing, the positioning arm is moved and inserted into the positioning grooves to position the turntable.

[0009] Preferably, three first grooves are evenly distributed on the circumference of the turntable, and a pressure block with a second groove is provided at each first groove, and the second groove and the first groove form the working hole.

[0010] Preferably, the chamfering processing assembly further comprises a locking arm which moves radially along the turntable, and a locking groove is arranged on the outer side of the pressing block. During positioning processing, the locking arm moves and is inserted into the locking groove to press the pressing block tightly.

[0011] Preferably, the feed conveyor line includes a conveying section and a material distribution section, the conveying section has a main channel, the material distribution section has two material distribution channels connected to the main channel, the two material distribution channels converge at the outlet end in the conveying direction, so that the workpieces to be processed on the two material distribution channels form a circular ring at the outlet end, and a material transfer assembly is provided at the connection between the main channel and the material distribution channel, and the material transfer assembly alternately transfers the bearings on the main channel to the two material distribution channels.

[0012] Preferably, the material dividing section comprises a material dividing plate and two guide plates symmetrically arranged relative to the material dividing plate, and the distance between the guide plate and the material dividing plate is consistent with the radius height of the bearing shell.

[0013] Preferably, a material shifting assembly is provided at one end of the guide plate facing the conveying section, and the material shifting assembly comprises a rotary cylinder and a material shifting rod, and the rotary cylinder drives the material shifting rod to swing.

[0014] A method for processing chamfering, using the above-mentioned production line for processing chamfering, two centering arms of the centering component center the workpiece to be processed in the working hole, after the centering is completed, the turntable rotates 120°, the working hole rotates to the chamfering processing component, the chamfering processing component processes the workpiece to be processed, after the chamfering is completed, the turntable rotates 120° again, the working hole rotates to the next processing position, and the above process is repeated.

[0015] As described above, a disc-type positioning tool of the present invention has the following beneficial effects:

[0016] The working hole on the disc-type positioning tooling can accommodate two workpieces to be processed at the same time, and the chamfering processing component can process two workpieces to be processed at the same time, which greatly speeds up the processing speed of the bearing shell. At the same time, it can match the processing speed of the previous and subsequent processes to ensure high-speed and orderly production of the entire production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic structural diagram of a production line for chamfering in this embodiment.

[0018] Figure 2 Shown is a partial structural schematic diagram of the turntable in this embodiment.

[0019] Figure 3 Shown is a complete structural schematic diagram of the turntable in this embodiment.

[0020] Figure 4 Shown is a schematic diagram of the structure of the pressing block in this embodiment.

[0021] Figure 5 Shown is a schematic structural diagram of the centering component in this embodiment.

[0022] Figure 6 Shown is a schematic diagram of the structure of the feed conveying line in this embodiment.

[0023] Component number description

[0024] 1 Feed conveyor line

[0025] 11. Transport channel

[0026] 111 Feeder

[0027] 111a Guide plate

[0028] 111b Separator Plate

[0029] 112 Main Channel

[0030] 12 Material shifting assembly

[0031] 121 Rotary Cylinder

[0032] 122 Feed rod

[0033] 13 Pushing device

[0034] 2 Discharging conveyor line

[0035] 3. Disc positioning tooling

[0036] 31 Turntable

[0037] 311 First Groove

[0038] 312 Mounting holes

[0039] 313 Briquetting

[0040] 313a Second groove

[0041] 313b Locking groove

[0042] 314 Positioning block

[0043] 314a Positioning slot

[0044] 315 First working hole

[0045] 316 Second working hole

[0046] 317 The third working hole

[0047] 32 Chamfering components

[0048] 33 Alignment components

[0049] 331 First pair of middle arms

[0050] 332 Second pair of middle arms

[0051] 333 Centering Plate

[0052] 34 Positioning arm

[0053] 35 Locking arm DETAILED DESCRIPTION

[0054] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0055] like Figure 1 As shown, the present invention provides a disc-type positioning tool, including: a rotating mechanism, including a turntable 31 and a driving mechanism, the turntable 31 is connected to the driving mechanism and rotates under the drive of the driving mechanism, the turntable 31 has three working holes evenly distributed on the circumference, each working hole is used to accommodate a workpiece to be processed, the workpiece to be processed is composed of two semicircular components, and the workpiece to be processed in this embodiment is a bearing shell; a centering component 33 and a chamfering processing component 32 are distributed along the circumference of the turntable 31, and correspond one to one to two adjacent working holes on the turntable 31; the centering component 33 includes two centering arms arranged opposite to each other, the two centering arms are respectively located on both sides of the turntable 31, and when one of the working holes rotates to the centering component 33, the two centering arms move toward each other to complete the centering positioning of the workpiece to be processed in the working hole; the chamfering processing component 32 includes a cutting tool, which is used to complete the chamfering processing of the workpiece to be processed in the working hole.

[0056] A disc-type positioning tool in the present embodiment realizes continuous processing and improves processing efficiency through the rotation of the turntable. In addition, three working holes are arranged along the circumference of the turntable, and the working holes on the turntable can accommodate two workpieces to be processed at the same time. The chamfering processing assembly can process two workpieces to be processed at the same time, which greatly speeds up the processing speed of the bearing shell and can match the processing speed of the previous and subsequent processes to ensure high-speed and orderly production of the entire production line.

[0057] Specifically, Figure 3 As shown, the turntable 31 includes three working holes, namely the first working hole 315, the second working hole 316 and the third working hole 317. The first working hole 315, the second working hole 316 and the third working hole 317 are evenly distributed along the circumference of the turntable 31, that is, the central angles corresponding to adjacent working holes are 120°, and the maximum diameters of the first working hole 315, the second working hole 316 and the third working hole 317 are consistent with the maximum diameter of the machined bearing.

[0058] As a preferred solution, Figure 2 As shown, in this embodiment, the rotating disk 31 is evenly provided with three first grooves 311 and three mounting holes 312 along its circumference. The mounting holes 312 and the first grooves 311 are arranged alternately, and each first groove 311 is provided with a pressing block 313 with a second groove 313a. The second groove 313a and the first groove 311 form the above-mentioned working hole. The working hole of this embodiment is a detachable structure and can be adapted to bearings of different diameters; Figure 2 and Figure 4 As shown, the first groove 311 and the second groove 313a are both semicircular. Since the shapes of the first groove 311 and the second groove 313a are consistent with the shape and size of the bearing shell, the bearing shell can be accommodated more stably, thereby ensuring the stability of the processing process. As a preferred installation scheme, the pressure block 313 is connected to the disc through a reset spring. Since the distance between the pressure block 313 and the turntable 31 is adjustable, it is convenient to move the bearing shell to and from the working hole. At the same time, during the processing of the bearing shell, it is also convenient to clamp the bearing shell to facilitate its processing.

[0059] In addition, if Figure 3The present embodiment also includes a positioning block 314, which is fixed in the mounting hole 312 of the turntable 31. The positioning block 314 has a positioning groove 314a. In order to ensure that the bearing on the turntable 31 can be processed stably, a positioning arm 34 that moves radially along the turntable 31 is provided on the circumferential outer side of the turntable 31. Three positioning grooves 314a are equidistantly provided on the circumference of the turntable 31. During positioning processing, the positioning arm 34 moves and is inserted into the positioning groove 314a to position the turntable 31. The setting of the positioning arm 34 can locate the position of the turntable 31 to prevent the turntable 31 from rotating, resulting in the centering component 33 being unable to correctly align the position of the bearing on the turntable 31, and the chamfering processing component being unable to cut at the correct position of the bearing. At the same time, the detachable structure facilitates the replacement of the positioning block 314. If the positioning groove 314a is excessively worn and the positioning effect cannot guarantee the processing accuracy, the positioning block 314 can be directly replaced without replacing the entire turntable 31, thereby saving costs.

[0060] In order to ensure the normal progress of the chamfering process and the accuracy of the chamfering process, the chamfering processing component also includes a locking arm 35 which moves radially along the turntable 31. The outer side of the above-mentioned pressure block 313 is provided with a locking groove 313b. During positioning processing, the locking arm 35 moves to insert into the locking groove 313b to press the pressure block 313. The locking groove 313b is used to press the pressure block 313 and the turntable 31 to lock the bearing shell in the working hole, which is convenient for subsequent tools to process the bearing shell. At the same time, during the processing of the bearing shell, the positioning arm 34 first performs a positioning operation. After the turntable 31 is positioned, the locking arm 35 locks the pressure block 313. The positioning arm 34 and the locking arm 35 work successively, and the processing of the bearing shell is more stable and accurate.

[0061] like Figure 5 As shown, the centering component 33 of this embodiment includes two centering arms arranged opposite to each other, namely a first centering arm 331 and a second centering arm 332. Centering plates 333 are provided at the ends of the first centering arm 331 and the second centering arm 332. In this embodiment, the centering plate 333 is circular. When the first centering arm 331 and the second centering arm 332 move toward each other, the centering plate 333 adjusts the bearing to a suitable posture when centering the bearing in the working hole, so as to facilitate the subsequent chamfering of the bearing.

[0062] The specific process of machining using the disc-type positioning fixture 3 is as follows (with Figure 2 The state in is the initial state):

[0063] Figure 3 In the embodiment, the first working hole 315, the second working hole 316 and the third working hole 317 are all provided with bearing bushes. The third working hole 317 corresponds to the loading and unloading position, that is, the loading and unloading of the working holes are completed at this position. The second working hole 316 corresponds to the chamfering processing component, and the first working hole 315 corresponds to the centering component 33. Figure 3 In the embodiment, the rotation direction of the turntable 31 is counterclockwise.

[0064] Figure 3 The turntable 31 in the middle rotates 120° counterclockwise, the positioning arm 34 performs the positioning operation, and the locking arm 35 performs the locking operation. At this time, the third working hole 317 rotates to the centering component 33, and the centering component 33 performs centering adjustment on the two bearings in the third working hole 317 to facilitate the subsequent chamfering of the bearings; the second working hole 316 rotates to the loading and unloading position, and the new bearing to be processed enters the second working hole 316, and at the same time, the processed bearing in the second working hole 316 is pushed out to enter the next processing step; the first working hole 315 rotates to the chamfering processing component, and the chamfering processing component chamfers the bearing in the first working hole 315; after completion, the turntable 31 continues to rotate 120° and repeats the above process.

[0065] A production line for processing chamfering, comprising: a disc-type positioning tool 3 as described above, a feed conveyor line 1 and a discharge conveyor line 2, wherein the outlet end of the feed conveyor line 1 and the inlet end of the discharge conveyor line 2 are symmetrically arranged relative to a turntable 31, and a pushing device 13 is arranged at the outlet end of the feed conveyor line 1, for moving the bearing on the feed conveyor line 1 to the turntable 31, and moving the bearing that has completed the chamfering processing on the turntable 31 to the discharge conveyor line 2; every time the turntable 31 rotates 120°, the centering component 33, the chamfering processing component 32 and the conveying component respectively correspond to a working hole.

[0066] As a preferred solution, Figure 1 As shown, the feeding conveying line 1 includes a conveying channel 11 and a kicking device 13, as shown in FIG. Figure 6 As shown, the conveying channel 11 includes a conveying section and a material distribution section. The conveying section has a main channel 112, and the material distribution section has two material distribution channels 111 connected to the main channel 112. The two material distribution channels 111 converge at the outlet end of the conveying direction, so that the workpieces to be processed on the two material distribution channels 111 form a ring at the outlet end. The connecting part of the main channel 112 and the material distribution channel 111 is provided with a material shifting assembly 12, and the material shifting assembly 12 shifts the bearings on the main channel 112 alternately into the two material distribution channels 111. The feed conveyor line 1 conveys the bearings to the disc-type positioning fixture 3, and at the same time makes the bearings present a ring-shaped structure at the outlet, which can speed up the conveying efficiency of the feed conveyor line 1, match the processing speed of the previous process, and speed up the production efficiency of the entire production line.

[0067] The dividing section includes a dividing plate 111b and two guide plates 111a symmetrically arranged relative to the dividing plate 111b. The distance between the guide plate 111a and the dividing plate 111b is consistent with the radius height of the bearing shell, which plays a limiting role, so that the bearing shell always maintains this posture during the transportation process, so that after the bearing shell is output from the dividing channel 111, the open ends of the two bearing shells are always opposite to each other, so that after the two bearing shells are output from the dividing channel 111, they can form a circular ring shape, which can realize the simultaneous internal and external chamfering of the two bearing shells in the subsequent process.

[0068] A material shifting assembly 12 is provided at one end of the guide plate 111a facing the conveying section. The material shifting assembly 12 includes a rotating cylinder 121 and a material shifting rod 122. The rotating cylinder 121 drives the material shifting rod 122 to swing. In the present embodiment, the bearings on the main channel 112 are alternately transferred to the two distribution channels 111 by the swinging of the material shifting rod 122. Since the openings of the bearings transported on the main channel 112 are all oriented in the same direction and toward the front of the conveying direction, the bearings are rotated by the movement of the material shifting rod 122. The material shifting rod 122 is rotated to the left and shifted into the distribution channel 111 on the left, so that the bearing opening in the distribution channel 111 on the left faces right. The material shifting rod 122 is rotated to the right and shifted into the distribution channel 111 on the right, so that the bearing opening in the distribution channel 111 on the right faces left. Then the bearings in the two distribution channels 111 converge at the outlet end of the distribution section, so that the two bearings are close to form a circle.

[0069] Preferably, the guide plate 111a is arc-shaped at one end facing the conveying section to facilitate the movement of the bearing. In this embodiment, when the bearings are respectively conveyed to the dividing plate 111b, the dividing rod is swung, and the bearings slide along the end of the arc-shaped guide plate 111a to the dividing channel 111. The arc section here has a guiding function, which is convenient for the bearings to enter the dividing channel 111 in a set posture; preferably, the maximum rotation angle of the dividing rod is 270°, and the maximum rotation angle of the dividing rod is determined according to the specific dimensions of the main channel 112 and the dividing channel 111, as long as it can be ensured that the dividing rod can stably and quickly distribute the bearings to the dividing channel 111.

[0070] against Figure 1 The entire conveyor line works in the figure, and the specific process of the entire conveyor line is as follows:

[0071] The feed conveyor line 1 transports the bearings and adjusts the posture of the bearings at the outlet of the feed conveyor line 1 to a state in which the open ends of the two bearings are opposite to each other and form a circle; the pushing device 13 pushes the bearings at the outlet of the feed conveyor line 1 into one of the working holes on the turntable 31, and at the same time pushes the bearings that have been processed in the working hole to the discharge conveyor line 2; after the pushing operation is completed, the turntable 31 rotates 120°, and at this time the working hole rotates to the positioning component, and the positioning component adjusts the position of the bearing in the working hole; after the position of the bearing is adjusted, the turntable 31 rotates 120°, and the working hole rotates to the tool component, and the tool component processes the bearing, and after the processing is completed, the turntable 31 rotates 120°, and the working hole rotates to the inlet of the discharge conveyor line 2, and at this time the pushing component performs a pushing operation to push the bearing on the feed conveyor line 1 into the working hole on the turntable 31, and at the same time pushes the bearing that has been processed in the working hole to the discharge conveyor line 2, and repeats the above process. The working processes of all the working holes are the same and are carried out simultaneously.

[0072] In summary, the present invention provides a disc-type positioning tool, the working hole thereon can accommodate two workpieces to be processed at the same time, and the chamfering processing component can process the two workpieces to be processed at the same time, which greatly speeds up the processing speed of the bearing shell, and can match the processing speed of the front and rear processes, ensuring high-speed and orderly production of the entire production line.

[0073] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A disc type positioning tool, characterized in that: include: The rotating mechanism comprises a rotating disk (31) and a driving mechanism, wherein the rotating disk (31) is connected to the driving mechanism and rotates under the drive of the driving mechanism, wherein the rotating disk (31) has three working holes evenly distributed in the circumference, each working hole being used to accommodate a workpiece to be processed, wherein the workpiece to be processed is composed of two semicircular components; The centering assembly (33) and the chamfering assembly (32) are distributed in an annular direction along the circumference of the rotating disk (31) and correspond one to one to two adjacent working holes on the rotating disk (31); The centering assembly (33) comprises two centering arms arranged opposite to each other, the two centering arms are respectively located on two sides of the rotating disk (31), and when one of the working holes is rotated to the centering assembly (33), the two centering arms move towards each other to complete the centering positioning of the workpiece to be processed in the working hole; The chamfering processing assembly (32) comprises a cutting tool, which is used to complete the chamfering processing of the workpiece to be processed in the working hole.

2. A disc type positioning tool according to claim 1, characterized in that: A positioning arm (34) is provided on the circumferential outer side of the turntable (31) and moves radially along the turntable (31). Three positioning grooves (314a) are equidistantly provided on the circumference of the turntable (31). During positioning processing, the positioning arm (34) moves and is inserted into the positioning groove (314a) to position the turntable (31).

3. The disc type positioning tool according to claim 1, characterized in that: A positioning arm (34) is provided on the circumferential outer side of the turntable (31) and moves radially along the turntable (31). Three mounting holes (312) are equidistantly provided on the circumference of the turntable (31). Positioning blocks (314) are fixedly provided in the three mounting holes (312). The positioning blocks (314) have positioning grooves (314a) that match the positioning arms (34). During positioning processing, the positioning arms (34) move and are inserted into the positioning grooves (314a) to position the turntable (311).

4. The disc type positioning tool according to claim 1, characterized in that: The rotating disk (31) has three first grooves (311) evenly distributed in the circumferential direction, and each first groove (311) is provided with a pressing block (313) with a second groove (313a), and the second groove (313a) and the first groove (311) form the working hole.

5. A disc type positioning tool according to claim 4, characterized in that: The chamfering processing assembly (32) further comprises a locking arm (35) which moves radially along the rotating disk (31), and a locking groove (313b) is provided on the outer side of the pressing block (313). During positioning processing, the locking arm (35) moves and is inserted into the locking groove (313b) to press the pressing block (313) tightly.

6. A production line for processing chamfering, characterized in that: include: The disc-type positioning tool (3) according to any one of claims 1 to 5; A conveying assembly comprises a feed conveying line (1) and a discharge conveying line (2), wherein the outlet end of the feed conveying line (1) and the inlet end of the discharge conveying line (2) are symmetrically arranged on both sides of the turntable (31); a pushing device (13) is arranged at the outlet end of the feed conveying line (1) for moving the workpiece to be processed on the feed conveying line (1) to the working hole of the turntable (31), and the workpiece to be processed that has completed the chamfering process in the working hole is ejected to the discharge conveying line (2); Every time the rotating disk (31) rotates 120°, the centering component (33), the chamfering component (32) and the conveying component respectively correspond to a working hole.

7. A production line for chamfering according to claim 6, characterized in that: The feed conveyor line (1) comprises a conveying section and a material distribution section, the conveying section having a main channel (112), the material distribution section having two material distribution channels (111) respectively connected to the main channel (112), a material shifting assembly (12) being provided at the connection point between the main channel (112) and the material distribution channels (111), the material shifting assembly (12) shifting the workpieces to be processed on the main channel (112) alternately into the two material distribution channels (111), so that the openings of the workpieces to be processed entering the two material distribution channels (111) face opposite directions, and the workpieces to be processed on the two material distribution channels (111) converge at the outlet end of the material distribution section to form a circle.

8. A production line for chamfering according to claim 7, characterized in that: The material dividing section comprises a material dividing plate (111b) and two guide plates (111a) symmetrically arranged relative to the material dividing plate (111b); the material dividing channel (111) is formed between the guide plate (111a) and the material dividing plate (111b); and the distance between the guide plate (111a) and the material dividing plate (111b) is consistent with the radius height of the workpiece to be processed.

9. A production line for chamfering according to claim 7, characterized in that: The material shifting assembly (12) comprises a rotary cylinder (121) and a rotatably arranged material shifting rod (122), wherein the rotary cylinder (121) drives the material shifting rod (122) to swing.

10. A method for processing chamfering, characterized in that: The disc-type positioning tool described in claim 1 is started, and the workpiece to be processed is placed in the current working hole at the loading and unloading place. As the turntable rotates, the current working hole is transferred to the centering component (33), and the two centering arms of the centering component (33) center the workpiece to be processed in the current working hole; After the centering is completed, the turntable (31) continues to rotate, and the current working hole rotates to the chamfering processing component (32), and the chamfering processing component (32) processes the workpiece to be processed; after the chamfering processing is completed, the turntable (31) rotates again, and the current working hole rotates to the loading and unloading position, and the above process is repeated.

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