Lens disassembly method

Abstract

The present application belongs to the technical field of lens recycling, and discloses a lens disassembling method for disassembling a lens. The lens comprises a lens barrel, and the inside of the lens barrel is fixed with a side lens and an inside lens by heat melting. The lens disassembling method comprises the following steps: S100, cutting off the covering material covering the periphery of the side lens to obtain the side lens; S200, cutting off the remaining covering material of the lens barrel to obtain the inside lens. In step S100, the lens barrel is cut by using a cutting method, and the side lens and the inside lens are subjected to small or even no radial pressure, so that the integrity of the obtained side lens is ensured. After the side lens is removed, the number of lenses remaining in the lens barrel is reduced. When step S200 is performed, only small pressure is needed to cut off the remaining covering material of the lens barrel, and the radial pressure on the inside lens is reduced, so that the integrity of the inside lens can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lens recycling, in particular to a lens disassembling method. BACKGROUND

[0002] In an optical lens, the inside of the lens barrel is usually provided with multiple lenses. The lenses are generally fixed in three ways inside the lens barrel. The first way is point gluing fixation. The second way is hot melting fixation. The third way is ring pressing fixation. When the material of the lens barrel is plastic, in order to ensure the stability of installation, the hot melting fixation is usually used to fix the lenses. In some cases, in order to reduce the hot melting process, a part of the lenses are pressed tightly in the inside of the lens barrel by a ring, that is, the hot melting fixation and the ring pressing fixation are simultaneously applied to the same lens. In the production and processing process, due to processing errors, assembly errors and other reasons, when the lens is detected to be defective, the lens needs to be recycled and disassembled, and the lenses with high prices are disassembled from the lens barrel for recycling.

[0003] There are two ways to disassemble the lens. The first way is the ejection type, which is suitable for the lenses fixed by point gluing. The lenses are ejected from the lens barrel by a pressure head. It is not suitable for the lenses fixed by hot melting. The second way is the knife cutting type, which is suitable for the lenses fixed by hot melting. The lens barrel is cut in half by a knife head, so as to recycle the lenses. However, when the number of lenses is large, a large radial force needs to be applied by the knife head. When the lenses are subjected to a large radial force, the lenses are easily damaged. Especially when the curvature of the lenses is large or the center position and the edge position of the lenses are thin, the lens barrel is cut along the radial direction by the knife head. At this time, the lenses are easily broken, and the recycling rate is low. SUMMARY

[0004] The purpose of the present application is to provide a lens disassembling method, improve the cutting method of the lens barrel, avoid the lenses being crushed, and improve the recycling rate.

[0005] To achieve this purpose, the following technical solutions are used in the present application:

[0006] The lens disassembling method is used for disassembling a lens. The lens includes a lens barrel. The inside of the lens barrel is fixed with edge position lenses and inside lenses by hot melting. The lens disassembling method includes the following steps:

[0007] S100, cutting off the covering material covering the periphery of the edge position lenses to obtain the edge position lenses;

[0008] S200, cutting off the remaining covering material of the lens barrel to obtain the inside lenses.

[0009] As an optional technical solution, the covering material covering the periphery of the edge position lenses is a ring cutting barrel. The step S100 includes the following steps:

[0010] S102, aligning the ring cutting tool with the ring cutting barrel;

[0011] S103, driving the ring cutter and / or the barrel to move axially close to, and driving the ring cutter and the barrel to rotate relatively, the ring cutter cutting the ring barrel around.

[0012] As an optional technical solution, before the step S102, the following step is further included:

[0013] S101, obtaining installation position data of the edge lens inside the barrel.

[0014] As an optional technical solution, the inside of the barrel is sequentially provided with the edge lens, a compression ring, a compression lens and the inside lens along the axial direction, the edge lens compresses the compression lens to the inner wall of the barrel through the compression ring, and after the step S103, the following step is performed:

[0015] S104, sequentially removing the edge lens, the compression ring and the compression lens.

[0016] As an optional technical solution, the step S102 includes the following steps:

[0017] S1021, fixedly installing the ring cutter on a bearing seat, and fixedly installing one end of the barrel away from the edge lens on a fixed seat;

[0018] S1022, adjusting the relative positions of the bearing seat and the fixed seat, so that the center axis of the through hole of the bearing seat coincides with the center axis of the ring barrel;

[0019] S1023, adjusting the position of the ring cutter in the bearing seat, so that the ring cutter extends into the through hole.

[0020] As an optional technical solution, in the step 1023, the distance from the lowest point of the ring cutter to the center axis of the edge lens is greater than or equal to the radius of the edge lens and less than the radius of the ring barrel.

[0021] As an optional technical solution, in the step S1022, it is ensured that the ring cutter is located on the side of the bearing seat away from the fixed seat.

[0022] As an optional technical solution, the step S103 is one of the following steps:

[0023] The barrel is fixed and immovable, the ring cutter is driven to move axially close to the ring barrel, and the ring cutter is driven to rotate around the center axis of the ring barrel, so that the ring cutter cuts the ring barrel;

[0024] The ring cutter is fixed, the ring cutting barrel is driven to move axially towards the ring cutter, and the ring cutting barrel is driven to rotate around its central axis, so that the ring cutter cuts the ring cutting barrel;

[0025] The lens barrel moves axially and rotates around its axis, and the ring cutter moves axially towards the ring cutting barrel;

[0026] The lens barrel does not move axially and rotates around its axis, and the ring cutter moves axially towards the ring cutting barrel.

[0027] As an optional technical solution, the remaining covering material of the lens barrel is a remaining material barrel, the inner side lens is two or more, and the S200 comprises the following steps:

[0028] S201, heating the longitudinal cutting tool;

[0029] S202, using the longitudinal cutting tool to cut the side wall of the remaining material barrel radially;

[0030] S203, removing the inner side lens.

[0031] As an optional technical solution, the step S202 comprises the following steps:

[0032] S2021, fixing the remaining material barrel to the disassembling machine, and driving the longitudinal cutting tool to cut the side wall of the remaining material barrel radially;

[0033] S2022, rotating the remaining material barrel around its central axis by 180°, and driving the longitudinal cutting tool to cut the side wall of the remaining material barrel radially.

[0034] The beneficial effects of the present application are:

[0035] The present application provides a lens disassembling method for disassembling a lens, the lens comprising a lens barrel, a side position lens and an inner side lens being fixed in the lens barrel by heat melting, the lens disassembling method comprising the following steps: S100, cutting off the covering material covering the periphery of the side position lens to obtain the side position lens; S200, cutting off the remaining covering material of the lens barrel to obtain the inner side lens. In step S100, the lens barrel is cut by using a cutting method, the side position lens and the inner side lens are subjected to small or no radial pressure, the integrity of the obtained side position lens is ensured, step S200 is performed after the side position lens is removed, the number of lenses remaining in the lens barrel is reduced, and when step S200 is performed, only small pressure is needed to cut off the remaining covering material of the lens barrel, the radial pressure on the inner side lens is reduced, and the integrity of the inner side lens can be ensured. The lens disassembling method of the present application can avoid the lens being crushed and improve the recovery rate. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a flow chart of the lens disassembling method of the present application;

[0037] Figure 2 is an assembly drawing of the ring cutter, the bearing seat, the fixing seat and the lens of the present application;

[0038] Figure 3 is a sectional view of A-A section in Figure 2

[0039] Figure 4 is an exploded view of the longitudinal cutter, the disassembling machine and the lens of the present application.

[0040] In the drawing:

[0041] 10, ring cutter; 101, long hole; 20, bearing seat; 21, threaded mounting hole; 30, fixing seat; 40, longitudinal cutter; 50, disassembling machine;

[0042] 1, lens barrel; 11, ring cutting barrel; 12, excess material barrel;

[0043] 2, edge position lens;

[0044] 3, inner side lens;

[0045] 4, pressing ring;

[0046] 5, pressing lens. DETAILED DESCRIPTION

[0047] The present application will be further described below in conjunction with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0048] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] ​In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0050] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0051] As shown in Figure 2 and Figure 3 , the lens includes a lens barrel 1, and the edge lens 2 and the inner lens 3 are fixed by heat melting inside the lens barrel 1.

[0052] As shown in Figure 1 , the present embodiment provides a lens disassembly method for disassembling a lens, and the lens disassembly method comprises the following steps:

[0053] S100, the covering material covering the edge lens 2 is cut around to obtain the edge lens 2.

[0054] S200, the remaining covering material of the lens barrel 1 is cut off to obtain the inner lens 3.

[0055] Specifically, in step S100, the lens barrel 1 is cut by using the cutting method around, the edge lens 2 and the inner lens 3 are subjected to small or even no radial pressure, so as to ensure the integrity of the obtained edge lens 2, and after the edge lens 2 is removed, the number of lenses remaining in the lens barrel 1 is reduced, and when step S200 is performed, only small pressure is needed to cut off the remaining covering material of the lens barrel 1, so that the radial pressure on the inner lens 3 is reduced, and the integrity of the inner lens 3 can be ensured. By using the lens disassembly method of the present application, the lenses can be prevented from being crushed, and the recovery rate is improved.

[0056] Optionally, the covering material covering the edge lens 2 is a ring-shaped lens barrel 11, and step S100 comprises the following steps:

[0057] S102, aligning the ring cutting tool 10 with the ring cutting cylinder 11. The ring cutting tool 10 is used to cut the ring cutting cylinder 11 in this embodiment, and the ring cutting tool 10 has high cutting precision and causes little damage to the edge-located lens 2.

[0058] S103, driving the ring cutting tool 10 and / or the lens cylinder 1 to move axially towards the ring cutting cylinder 11, and driving the ring cutting tool 10 and the lens cylinder 1 to rotate relative to each other, so that the ring cutting tool 10 cuts the ring cutting cylinder 11 in a ring shape. In one of the embodiments, the lens cylinder 1 is fixed, the ring cutting tool 10 moves axially towards the ring cutting cylinder 11, and the ring cutting tool 10 rotates around the central axis of the ring cutting cylinder 11, so that when the ring cutting tool 10 contacts the ring cutting cylinder 11, the ring cutting cylinder 11 is cut, until the ring cutting cylinder 11 is completely cut.

[0059] Optionally, before step S102, the following step is further included:

[0060] S101, obtaining installation position data of the edge-located lens 2 inside the lens cylinder 1. Before the lens is disassembled, the edge-located lens 2 can be directly seen from the port of the lens cylinder 1, but the staff or disassembly equipment at the disassembly post does not know the thickness of the edge-located lens 2 and the installation depth of the edge-located lens 2 in the lens cylinder 1, and thus starts to cut the lens cylinder 1, which is blind cutting, and it is easy to cause the situation that the covering material covering the edge-located lens 2 is completely cut but the cutting process is not stopped, or the covering material covering the edge-located lens 2 is only partially cut, for example, half of the covering material is cut, and then the cutting process is stopped. Therefore, before cutting, the staff at the disassembly post is informed or the disassembly equipment is inputted with the installation position data of the edge-located lens 2 inside the lens cylinder 1, for example, the installation position data of the edge-located lens 2 inside the lens cylinder 1 is obtained from the assembly department, and after the lens cylinder 1 is cut to a preset value, the cutting process is stopped, so as to remove the edge-located lens 2.

[0061] Optionally, the inside of the lens cylinder 1 is sequentially provided with the edge-located lens 2, the pressing ring 4, the pressing lens 5, and the inner lens 3 along the axial direction, the edge-located lens 2 presses the pressing lens 5 against the inner wall of the lens cylinder 1 through the pressing ring 4, and after step S103, the following step is performed:

[0062] S104, sequentially removing the edge-located lens 2, the pressing ring 4, and the pressing lens 5. It is known from common knowledge that for a cylindrical component, the path length spirally wound around the periphery thereof is much greater than the path length in the axial direction. For this embodiment, after the covering material covering the edge-located lens 2 is cut, the cutting process can be stopped, and it is not necessary to continue cutting the covering material around the pressing ring 4 and the covering material around the pressing lens 5, thereby shortening the disassembly time.

[0063] Optionally, step S102 includes the following steps:

[0064] S1021. The circumferential cutting tool 10 is fixedly installed on the support 20, and the end of the lens barrel 1 away from the edge lens 2 is fixedly installed on the fixing base 30.

[0065] S1022. Adjust the relative positions of the bearing seat 20 and the fixed seat 30 so that the central axis of the through hole of the bearing seat 20 coincides with the central axis of the circumferential cutting cylinder 11.

[0066] S1023. Adjust the position of the circumferential cutting tool 10 on the support seat 20 so that the circumferential cutting tool 10 extends into the through hole.

[0067] The bearing seat 20 is provided with a threaded mounting hole 21, and the circumferential cutting tool 10 is provided with an elongated hole 101. The threaded fastener passes through the elongated hole 101 and is threadedly connected to the threaded mounting hole 21. The length extension direction of the elongated hole 101 is parallel to or coincides with the tangential direction of the through hole. When the wall thickness specification or the diameter of the circumferential cutting cylinder 11 changes, the circumferential cutting tool 10 can be adjusted along the tangential direction.

[0068] Optionally, in step 1023, the distance from the lowest point of the circumferential cutting tool 10 to the central axis of the edge lens 2 is greater than or equal to the radius of the edge lens 2 and less than the radius of the circumferential cutting cylinder 11.

[0069] In step 1023 of this embodiment, the distance from the lowest point of the circumferential cutting tool 10 to the central axis of the edge lens 2 is equal to the radius of the edge lens 2, that is, the circumferential cutting depth of the circumferential cutting tool 10 is equal to the wall thickness of the circumferential cutting cylinder 11, and the circumferential cutting cylinder 11 is circumferentially cut in one go. The lowest point of the circumferential cutting tool 10 refers to the point where the cutting edge of the circumferential cutting tool 10 is closest to the central axis of the edge lens 2.

[0070] In this embodiment, the distance from the lowest point of the circumferential cutting tool 10 to the central axis of the edge lens 2 can be controlled by adjusting the circumferential cutting tool 10 tangentially. When performing step 102, after the central axis of the through hole of the bearing seat 20 coincides with the central axis of the circumferential cutting cylinder 11, the employee at the disassembly station observes the distance between the lowest point of the circumferential cutting tool 10 and the outer wall surface of the edge lens 2 axially. If the distance value is equal to 0, the circumferential cutting process can be performed, and the periphery of the edge lens 2 will not be covered with covering material. If the distance value is small, such as 0.2 mm, 0.3 mm, or 0.5 mm, the circumferential cutting process can also be performed, and the periphery of the edge lens 2 will be covered with a covering material of 0.2 mm, 0.3 mm, or 0.5 mm thickness. The covering material can be easily broken off, and then the covering material around the edge lens 2 is removed.

[0071] Optionally, in step S1022, ensure that the circumferential cutting tool 10 is located on the side of the support 20 away from the fixed base 30.

[0072] When the ring cutting process is performed, the ring cutting cylinder 11 is inserted into the through hole, and the ring cutting cylinder 11 is cut by the ring cutting tool 10 at the end of the through hole away from the fixed seat 30, and the cut cover material is blocked by the bearing seat 20 to prevent the cover material from drifting to one side of the fixed seat 30.

[0073] Optionally, step S103 is one of the following steps:

[0074] The lens barrel 1 is fixed, the ring cutting tool 10 is driven to move axially towards the ring cutting cylinder 11, and the ring cutting tool 10 is driven to rotate around the central axis of the ring cutting cylinder 11, so that the ring cutting tool 10 cuts the ring cutting cylinder 11.

[0075] The ring cutting tool 10 is fixed, the ring cutting cylinder 11 is driven to move axially towards the ring cutting tool 10, and the ring cutting cylinder 11 is driven to rotate around its own central axis, so that the ring cutting tool 10 cuts the ring cutting cylinder 11.

[0076] The lens barrel 1 moves axially and rotates around its own axis, and the ring cutting tool 10 moves axially towards the ring cutting cylinder 11.

[0077] The lens barrel 1 does not move axially and rotates around its own axis, and the ring cutting tool 10 moves axially towards the ring cutting cylinder 11.

[0078] The ring cutting form has multiple modes, for example, the lens barrel 1 is fixed, the ring cutting tool 10 moves axially and rotates around the central axis of the lens barrel 1, or the ring cutting tool 10 is fixed, the lens barrel 1 moves axially and rotates around its own central axis, or the lens barrel 1 and the ring cutting tool 10 both rotate around the central axis of the lens barrel 1 in opposite directions, and at least one of them moves axially.

[0079] Optionally, the remaining cover material of the lens barrel 1 is a surplus cylinder 12, and the inner side lenses 3 are two or more, and S200 includes the following steps:

[0080] S201, heating the longitudinal cutting tool 40.

[0081] S202, using the longitudinal cutting tool 40 to move radially towards and cut the side wall of the surplus cylinder 12.

[0082] S203, removing the inner side lenses 3.

[0083] In this embodiment, the inner side lenses 3 are two, the inner side lens 3 close to the compression lens 5 is the first lens, the inner side lens 3 away from the compression lens 5 is the second lens, the diameter of the edge lens 2 is greater than the diameter of the compression lens 5, the diameter of the compression lens 5 is greater than the diameter of the first lens, and the diameter of the first lens is greater than the diameter of the second lens. Correspondingly, the inner hole diameters of each part of the lens barrel 1 are matched with the lenses at each position, and the blade shape of the longitudinal cutting tool 40 is matched with the shape of the side wall of the lens barrel 1.

[0084] In step S202 of this embodiment, the longitudinal cutting tool 40 approaches and cuts the residual material cylinder 12 radially. From contact to complete cut, the distance the longitudinal cutting tool 40 moves is equal to the wall thickness of the residual material cylinder 12. The side wall of the residual material cylinder 12 can be cut off in one go, which is fast.

[0085] In some other embodiments, in step 200, two cutters are arranged at both ends of the waste material cylinder 12, the two cutters are aligned axially, and the two cutters are brought close to each other axially to cut off the side wall of the waste material cylinder 12. In this step, the speed is slower than using the longitudinal cutting cutter 40 to cut the waste material cylinder 12 radially.

[0086] Optionally, step S202 includes the following steps:

[0087] S2021. Fix the waste material cylinder 12 to the dismantling machine 50, and drive the longitudinal cutting tool 40 to approach and cut off the side wall of the waste material cylinder 12 radially.

[0088] S2022, rotate the waste material cylinder 12 180° around its own central axis, and drive the longitudinal cutting tool 40 to approach and cut the side wall of the waste material cylinder 12 radially.

[0089] like Figure 4 As shown, the lens barrel 1 is mounted on the mounting plate of the disassembly machine 50, and the longitudinal cutting tool 40 is aligned radially with the lens barrel 1.

[0090] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A lens disassembling method for disassembling a lens, the lens comprising a lens barrel (1), an edge lens (2) and an inner lens (3) being fixed in the inside of the lens barrel (1) by heat melting, characterized in that, The lens disassembling method comprises the following steps: S100, cutting off the covering material around the edge lens (2) to obtain the edge lens (2); S200, cutting off the remaining covering material of the lens barrel (1) to obtain the inner lens (3).

2. The lens disassembly method according to claim 1, wherein The covering material around the edge lens (2) is a ring cutting barrel (11), and the step S100 comprises the following steps: S102, aligning the ring cutting tool (10) with the ring cutting barrel (11); S103, driving the ring cutting tool (10) and / or the lens barrel (1) to move axially close to each other, and driving the ring cutting tool (10) and the lens barrel (1) to rotate relative to each other, so that the ring cutting tool (10) cuts off the ring cutting barrel (11) in a surrounding manner.

3. The lens disassembly method according to claim 2, wherein Before the step S102, the following step is further included: S101, obtaining installation position data of the edge lens (2) inside the lens barrel (1).

4. The lens disassembly method according to claim 3, wherein The inside of the lens barrel (1) is sequentially provided with the edge lens (2), a pressing ring (4), a pressing lens (5) and the inner lens (3) in an axial direction, the edge lens (2) presses the pressing lens (5) against the inner wall of the lens barrel (1) through the pressing ring (4), and after the step S103, the following step is performed: S104, sequentially removing the edge lens (2), the pressing ring (4) and the pressing lens (5).

5. The lens disassembly method according to claim 2, wherein The step S102 comprises the following steps: S1021, fixedly mounting the ring cutting tool (10) on a bearing seat (20), and fixedly mounting one end of the lens barrel (1) away from the edge lens (2) on a fixed seat (30); S1022, adjusting the relative positions of the bearing seat (20) and the fixed seat (30) so that the central axis of the through hole of the bearing seat (20) coincides with the central axis of the ring cutting barrel (11); S1023, adjusting the position of the ring cutting tool (10) on the bearing seat (20) so that the ring cutting tool (10) extends into the through hole.

6. The lens disassembly method according to claim 5, wherein In the step 1023, the distance from the lowest point of the ring cutting tool (10) to the central axis of the edge lens (2) is greater than or equal to the radius of the edge lens (2) and less than the radius of the ring cutting barrel (11).

7. The lens disassembly method according to claim 5, wherein In the step S1022, it is ensured that the ring cutting tool (10) is located on the side of the bearing seat (20) away from the fixed seat (30).

8. The lens disassembly method of claim 2, wherein, The step S103 is one of the following steps: The lens barrel (1) is fixed, the ring cutting tool (10) is driven to move axially close to the ring cutting barrel (11), and the ring cutting tool (10) is driven to rotate around the central axis of the ring cutting barrel (11), so that the ring cutting tool (10) cuts off the ring cutting barrel (11); The ring cutting tool (10) is fixed, the ring cutting barrel (11) is driven to move axially close to the ring cutting tool (10), and the ring cutting barrel (11) is driven to rotate around its own central axis, so that the ring cutting tool (10) cuts off the ring cutting barrel (11); The lens barrel (1) moves axially and rotates around its own axis, and the ring cutter (10) approaches the ring cutting barrel (11) axially. The lens barrel (1) does not move axially and rotates around its own axis, and the ring cutter (10) approaches the ring cutting barrel (11) axially.

9. The lens disassembly method of claim 1, wherein, The remaining covering material of the lens barrel (1) is a remaining material barrel (12), and the inner side lenses (3) are two or more, and the S200 comprises the following steps: S201, heating a longitudinal cutting tool (40); S202, approaching and cutting the side wall of the remaining material barrel (12) radially by using the longitudinal cutting tool (40); S203, removing the inner side lenses (3).

10. The lens disassembly method according to claim 9, wherein The step S202 comprises the following steps: S2021, fixing the remaining material barrel (12) to a disassembling machine (50), and driving the longitudinal cutting tool (40) to approach and cut the side wall of the remaining material barrel (12) radially; S2022, rotating the remaining material barrel (12) by 180° around its own central axis, and driving the longitudinal cutting tool (40) to approach and cut the side wall of the remaining material barrel (12) radially.

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