Cut-off apparatus and cut-off method for ring-hole bushing

Abstract

The application discloses a cutting device and a cutting method for a ring-hole sleeve material piece, which are used for cutting a material core in the ring-hole sleeve material piece when the ring-hole sleeve material piece rotates. The cutting device comprises an outer cutting knife rod, an inner cutting knife rod, a cutting assembly and a driving assembly. A cutting window is formed in the outer cutting knife rod. The inner cutting knife rod is arranged in the outer cutting knife rod, and a first mounting groove is formed in the inner cutting knife rod. The cutting assembly is arranged in the first mounting groove. The driving assembly is connected to the inner cutting knife rod. After a ring-hole sleeve material piece is fixed and driven to rotate by an external device, part of the cutting device is inserted into a ring hole of the ring-hole sleeve material piece, and the inner cutting knife rod is driven to move horizontally in the outer cutting knife rod by the driving assembly, so that part of the cutting assembly passes through the cutting window to cut the material core.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, and specifically relates to a cutting device and cutting method for ring hole sleeve parts. Background Technology

[0002] Please refer to Figure 1 , Figure 1 This is a cross-sectional view of the annular bushing component. (Example:) Figure 1 As shown, the annular hole sleeve is a type of part widely used in machining. It has an outer cylinder 11 and a core 12 connected inside the outer cylinder 11. When machining it, the core 12 needs to be cut out from the outer cylinder 11. However, because the outer cylinder 11 shields the core 12, it can only be inserted into the annular hole 13 from one end to cut from the root of the core.

[0003] In existing technologies, most machining operations involve lathe operators cutting the ring holes one cut at a time on a lathe until the root of the core 12 is cut off. During processing, each cut typically takes 3-5 mm and takes about 3 hours, resulting in low work efficiency. Furthermore, the cutting process cannot be observed during machining, leading to a low yield and increased production costs.

[0004] Therefore, there is an urgent need to develop a cutting device and method for ring hole sleeves that overcomes the above-mentioned defects. Summary of the Invention

[0005] To address the above problems, the present invention provides a cutting device for a ring-shaped sleeve component, wherein the device is used to cut the internal core of the ring-shaped sleeve component when it rotates, the cutting device comprising:

[0006] An external cutting tool bar has a cutting window on it;

[0007] An inner cutting blade bar is disposed within the outer cutting blade bar, and a first mounting groove is provided on the inner cutting blade bar;

[0008] The cutting component is installed in the first mounting slot;

[0009] The drive assembly is connected to the inner cutting blade bar;

[0010] In this process, after the annular sleeve is fixed and rotated by an external device, a portion of the cutting device is inserted into the annular hole of the annular sleeve. The inner cutting bar is driven by the driving assembly to move horizontally in the outer cutting bar, so that a portion of the cutting assembly passes through the cutting window to cut the core material.

[0011] The aforementioned cutting device further includes a plurality of first support members, which are arranged around the outer cutting blade and protrude from the outer cutting blade. When the outer cutting blade is located in the annular hole, the first support members abut against the inner wall of the annular hole to fix the outer cutting blade.

[0012] The aforementioned cutting device, wherein the cutting assembly comprises:

[0013] A cutting blade is disposed in the first mounting slot;

[0014] A first connector is inserted through the inner cutting blade bar, and the cutting blade is rotatably connected to the portion of the first connector located in the first mounting groove;

[0015] The first guide member is provided with a first guide groove on the cutting blade, and the first guide member passes through the outer cutting blade bar and the first guide groove;

[0016] When the inner cutting blade is driven to move towards the bottom of the annular hole, the part of the cutting blade guided by the first guide and the first guide groove passes through the cutting window to cut the inner wall of the annular hole.

[0017] The aforementioned cutting device also includes a display component for displaying cutting information in real time during the cutting process.

[0018] The aforementioned cutting device, wherein the display component includes:

[0019] The pointer module is further provided with a second mounting slot on the inner cutting blade bar, and the pointer module is installed in the second mounting slot;

[0020] A dial is fitted onto the outer cutting blade bar, and an indicator window is also provided on the outer cutting blade bar. The dial is provided with multiple scale lines. When the cutting assembly is cutting, part of the pointer module extends out of the indicator window to indicate the corresponding scale line to display the current cutting depth.

[0021] The aforementioned cutting device, wherein the pointer module includes:

[0022] The pointer is positioned in the second mounting slot;

[0023] The second connector is inserted through the inner cutting blade bar, and the pointer is rotatably connected to the portion of the second connector located in the second mounting groove;

[0024] The second guide member has a second guide groove on the pointer and is inserted through the outer cutting tool bar and the second guide groove.

[0025] When the inner cutting blade is driven to move towards the bottom of the annular hole, the pointer moves synchronously with the cutting blade, and part of the pointer extends out of the indicator window to indicate a corresponding scale line.

[0026] In the aforementioned cutting device, the dial has a notch, a plurality of scale lines are provided on a first side of the notch, and a plurality of scale values ​​corresponding to the plurality of scale lines are provided on a second side of the notch.

[0027] The aforementioned cutting device, wherein the driving component includes:

[0028] The first flange is installed on one end face of the inner cutting tool bar;

[0029] A drive shaft, one end of which passes through the first flange and is inserted into one end of the inner cutting tool bar;

[0030] A feed drive disk, with the other end of the drive shaft connected to the feed drive disk;

[0031] The feed drive disk rotates, causing the transmission shaft to rotate, which in turn causes the first flange to drive the inner cutting bar to move.

[0032] The aforementioned cutting device further includes a support frame having a through hole. One end of the through hole is fitted onto one end of the inner cutting blade, and the other end of the through hole is fitted with a second flange. One end of the drive shaft passes through the through hole and the first flange and is inserted into one end of the inner cutting blade. The other end of the drive shaft passes through the through hole and the second flange and is connected to the feed drive disc.

[0033] The present invention also provides a method for cutting a ring-shaped sleeve component, wherein the cutting device applied to any one of the above-mentioned methods cuts off the internal core of the ring-shaped sleeve component during rotation, the cutting method comprising:

[0034] The annular sleeve is fixed and driven to rotate by an external device;

[0035] A portion of the cutting device is inserted into the annular hole of the annular sleeve material, and the outer cutting blade of the cutting device is fixed in the annular hole;

[0036] The drive assembly of the cutting device drives the inner cutting bar of the cutting device to move horizontally in the outer cutting bar, so that a portion of the cutting assembly of the cutting device, which is located in the first mounting groove of the inner cutting bar, passes through the cutting window of the outer cutting bar to cut the core material.

[0037] The advantages of this invention compared to the prior art are as follows: This invention solves the problem of cutting the core of the annular hole sleeve material, and at the same time, it can control the size of the cutting groove inside the annular hole during cutting and can observe the cutting degree in real time, thereby improving work efficiency and yield, and also reducing production costs.

[0038] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a cross-sectional view of the annular bushing component;

[0041] Figure 2 This is a schematic diagram of the structure of the first embodiment of the cutting device of the present invention;

[0042] Figure 3 for Figure 2 Schematic diagram of the structure of the Chinese and foreign cutting tool holders;

[0043] Figure 4 for Figure 2 Schematic diagram of the structure of the inner cutting blade holder and cutting assembly;

[0044] Figure 5 for Figure 2 A schematic diagram of the structure of the in-center cutting tool holder and the display assembly;

[0045] Figure 6 This is a schematic diagram of the scale.

[0046] Figure 7 for Figure 2 A schematic diagram of the structure of the drive component;

[0047] Figure 8 for Figure 2 A cross-sectional view of the driving component;

[0048] Figure 9 This is a schematic diagram of the structure of the second embodiment of the cutting device of the present invention;

[0049] Figure 10 This is a flowchart of the cutting method of the present invention. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] The illustrative embodiments and descriptions of the present invention are used to explain the invention, but are not intended to limit the invention. Furthermore, elements / components using the same or similar reference numerals in the drawings and embodiments are used to represent the same or similar parts.

[0052] The terms "first," "second," "S1," "S2," etc., used in this document do not specifically refer to any order or sequence, nor are they intended to limit the invention. They are merely used to distinguish elements or operations described using the same technical terms.

[0053] The directional terms used in this article, such as up, down, left, right, front, or back, are for reference only when referring to the accompanying drawings. Therefore, the use of directional terms is for illustrative purposes and not to limit this work.

[0054] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0055] The term "and / or" as used herein includes any or all of the things mentioned.

[0056] The term "multiple" in this article includes "two" and "more than two"; the term "multiple groups" in this article includes "two groups" and "more than two groups".

[0057] Certain terms used to describe this application will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the application.

[0058] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of the first embodiment of the cutting device of the present invention. Figure 2 As shown, and please refer to Figure 1This invention discloses a cutting device for a ring-hole sleeve component, used to cut the core 12 inside the ring-hole sleeve component when it rotates. The cutting device includes: an outer cutting bar 21, an inner cutting bar 22, a cutting assembly 23, and a driving assembly 24. The outer cutting bar 21 has a cutting window 211. The inner cutting bar 22 is disposed in the outer cutting bar 21 and has a first mounting groove 221. The cutting assembly 23 is installed in the first mounting groove 221. The driving assembly 24 is connected to the inner cutting bar 22. After the ring-hole sleeve component 1 is fixed and driven to rotate by an external device, a portion of the cutting device is inserted into the ring hole 13 of the ring-hole sleeve component 1. The driving assembly 24 drives the inner cutting bar 22 to move horizontally in the outer cutting bar 21, so that a portion of the cutting assembly 23 passes through the cutting window 211 to cut the core 12.

[0059] For example, the production process of the annular hole sleeve material involved in this invention involves machining a φ140mm hole with a depth of 2000mm from a bar stock, and an annular hole material with φ280mm and φ210mm diameters and a depth of 1500mm from the annular hole sleeve material. The cutting device of this invention is used to cut the core 12 at a depth of 1500mm in the annular hole sleeve material. The annular hole refers to... Figure 1 This invention addresses the problem of controllable and visible cutting dimensions for a φ140mm hole with a depth of 2000mm.

[0060] In this embodiment, the cutting device further includes a plurality of first support members 25, which are arranged around the outer cutting blade 21 and protrude from the outer cutting blade 21. When the outer cutting blade 21 is located in the annular hole 13, the first support members 25 abut against the inner wall of the annular hole 13 to fix the outer cutting blade 21.

[0061] Please refer to Figures 3-4 , Figure 3 for Figure 2 Schematic diagram of the structure of the Chinese and foreign cutting tool holders; Figure 4 for Figure 2 A schematic diagram of the structure of the inner cutting blade holder and the cutting assembly. (See diagram below.) Figures 3-4As shown, the cutting assembly 23 includes: a cutting blade 231, a first connector 232, and a first guide 233. The cutting blade 231 is disposed in the first mounting groove 221. The first connector 232 passes through the inner cutting blade rod 22, and the cutting blade 231 is rotatably connected to the portion of the first connector 232 located in the first mounting groove 221. A first guide groove F1 is provided on the cutting blade 231, and the first guide 233 passes through the outer cutting blade rod 21 and the first guide groove F1. When the inner cutting blade rod 22 is driven to move towards the bottom of the annular hole 13, the portion of the cutting blade 231 guided by the first guide 233 and the first guide groove F1 passes through the cutting window 211 to cut the inner wall of the annular hole 13.

[0062] In this embodiment, using the first connector 232 as a positioning pin is a preferred implementation.

[0063] In this embodiment, using the first guide member 233 as a guide post is a preferred implementation.

[0064] Specifically, the cutting assembly is the main processing part. The positioning pin fixes the cutting blade 231 on the inner cutting blade bar 22. At the same time, the guide post passes through the first guide groove F1 of the cutting blade 231 and is fixed on the outer cutting blade bar 21. It is pushed forward by the drive assembly 24. The inner cutting blade bar 22 moves forward, and the positioning pin drives the cutting blade 231 forward. The guide post remains stationary. The cutting blade 231 is guided by the guide post and the first guide groove F1. The inner groove surface of the first guide groove F1 abuts against the outer circle of the cutting blade 231, with the bottom facing forward, causing the top tip of the cutting blade 231 to turn upward and cut the part.

[0065] Please refer to Figure 3 and Figure 5 , Figure 5 for Figure 2 A schematic diagram of the structure of the inner cutting tool holder and the display assembly. (See diagram below.) Figure 3 and Figure 5 As shown, the cutting device of the present invention further includes a display component 26 for displaying cutting information in real time during the cutting process. The display component 26 includes a pointer module 261 and a scale dial 262. The inner cutting blade 22 is provided with a second mounting groove 222, and the pointer module 261 is installed in the second mounting groove 222. The scale dial 262 is sleeved on the outer cutting blade 21, and the outer cutting blade 21 is provided with an indicator window 212. The scale dial 262 is provided with multiple scale lines. When the cutting component 23 is cutting, a portion of the pointer module 261 extends out of the indicator window 212 to indicate a corresponding scale line to display the current cutting depth.

[0066] Further, the pointer module 261 includes: a pointer 2611, a second connector 2612, and a second guide 2613. The pointer 2611 is disposed in the second mounting groove 222. The second connector 2612 passes through the inner cutting blade 22, and the pointer 2611 is rotatably connected to the portion of the second connector 2612 located in the second mounting groove 222. A second guide groove F2 is provided on the pointer 2611, and the second guide 2613 passes through the outer cutting blade 21 and the second guide groove F2. When the inner cutting blade 22 is driven to move towards the bottom of the annular hole 13, the pointer 2611 moves synchronously with the cutting blade 231, and a portion of the pointer 2611 extends out of the indicator window 212 to indicate a corresponding scale line.

[0067] In this embodiment, it is preferred to use the pointer 2611 as a cutting blade. The structures of the second connector 2612 and the second guide 2613 are the same as those of the first connector 232 and the first guide 233 in terms of structure and installation method. Therefore, when the inner cutting blade rod 22 moves to drive the cutting blade 231, the inner cutting blade rod 22 also drives the pointer 2611 synchronously. Thus, the cutting blade that serves as the pointer moves synchronously with the cutting blade 231, and the blade tip position moves synchronously.

[0068] In this embodiment, using the first connector 232 as a positioning pin is a preferred implementation.

[0069] In this embodiment, using the first guide member 233 as a guide post is a preferred implementation.

[0070] Specifically, the positioning pin fixes the pointer 2611 to the inner cutting bar 22, while the guide post passes through the second guide groove F2 of the pointer 2611 and is fixed to the outer cutting bar 21. It is pushed forward by the drive assembly 24. The inner cutting bar 22 moves forward, and the positioning pin drives the pointer 2611 forward. The guide post remains stationary, and the pointer 2611 is guided by the guide post and the second guide groove F2. The inner groove surface of the second guide groove F2 abuts against the outer circle of the pointer 2611, with the bottom facing forward, causing the top tip of the pointer 2611 to turn upward and indicate the corresponding scale line.

[0071] Furthermore, please refer to Figure 6 , Figure 6 This is a schematic diagram of the dial's structure. (Example:) Figure 6 As shown, the dial 262 has a notch Q. A plurality of scale lines are provided on the first side S1 of the notch Q, and a plurality of scale values ​​corresponding to the scale lines are provided on the second side S2 of the notch Q. By observing the position of the pointer 2611 on the first side S1, the current cutting position and dimension can be displayed according to the scale lines and scale values.

[0072] In one embodiment of the present invention, the display component further includes a drawing paper mounted on the first side surface S1, and the tip of the pointer 2611 is replaced with a pen tip, so that the cutting curve can be drawn on the drawing paper by the pen tip during cutting.

[0073] Please refer to Figures 7-8 , Figure 7 for Figure 2 A schematic diagram of the structure of the drive component; Figure 8 for Figure 2 A cross-sectional view of the drive assembly 24. The drive assembly 24 includes: a first flange 241, a drive shaft 242, and a feed drive disk 243. The first flange 241 is mounted on one end face of the inner cutting blade 22. One end of the drive shaft 242 passes through the first flange 241 and is inserted into one end of the inner cutting blade 22 on which the first flange 241 is mounted. The other end of the drive shaft 242 is connected to the feed drive disk 243. Rotating the feed drive disk 243 drives the drive shaft 242 to rotate, thereby causing the first flange 241 to drive the inner cutting blade 22 to move.

[0074] In this embodiment, the first flange 241 is fixedly mounted on one end face of the inner cutting blade 22 by at least one fixing screw 244. The cutting device also includes a support frame 27, which has a through hole 271. One end of the through hole 271 is sleeved on one end of the inner cutting blade 22, and the other end of the through hole 272 is equipped with a second flange 245. One end of the drive shaft 242 passes through the through hole 271 and the first flange 241 and is inserted into one end of the inner cutting blade 22. The other end of the drive shaft 242 passes through the through hole 271 and the second flange 245 and is connected to the feed drive disk 243.

[0075] In this embodiment, the drive assembly 24 further includes a first bearing 246 and a second bearing 24. A first recess is formed on the end face of the second flange 245 facing the feed drive disk 243. The first bearing 246 is installed in the first recess and sleeved on the transmission shaft 242, assisting the rotation of the transmission shaft 242. A boss T extends outward from the middle of the transmission shaft 242, and the second bearing 24 is sleeved on the boss T. The boss T clamps the second bearing 24 with the bottom surface of the second flange 245. Thus, by rotating the feed drive disk 243, the transmission is carried out through the bearing-supported transmission shaft 242. The transmission shaft 242 rotates and engages with the inner hole of the first flange 241 via a thread, adjusting the forward and backward movement of the first flange 241. The first flange 241 is fixed to the inner cutting blade 22 by screws 244, achieving synchronous forward and backward movement with the inner cutting blade 22.

[0076] In this embodiment, the first bearing 246 is a tapered roller bearing, which is a preferred implementation.

[0077] In this embodiment, the second bearing 247 is a push-pull cylindrical roller bearing, which is a preferred implementation.

[0078] Please refer to Figure 9 , Figure 9 This is a schematic diagram of the structure of a second embodiment of the cutting device of the present invention. Figure 9 As shown, the cutting device of the present invention further includes a second support member 28, which is mounted on the outer cutting blade 21.

[0079] Please refer to Figure 10 , Figure 10 This is a flowchart of the cutting method of the present invention. Figure 10 As shown, the present invention provides a method for cutting a ring-shaped sleeve component, wherein the cutting device described in any one of the above-mentioned methods cuts off the internal core of the ring-shaped sleeve component during rotation. The cutting method includes:

[0080] Step S1: Fix the annular sleeve material with an external device and drive it to rotate;

[0081] Step S2: Insert part of the cutting device into the annular hole of the annular sleeve material, and fix the outer cutting blade of the cutting device in the annular hole;

[0082] Step S3: The inner cutting bar of the cutting device is driven to move horizontally in the outer cutting bar by the drive assembly of the cutting device, so that a portion of the cutting assembly of the cutting device disposed in the first mounting groove of the inner cutting bar passes through the cutting window of the outer cutting bar to cut the core material.

[0083] In summary, this invention solves the problem of cutting the core of the annular hole sleeve. At the same time, it can control the size of the cutting groove inside the annular hole during cutting and can observe the cutting degree in real time, thereby improving work efficiency and yield, and also reducing production costs.

[0084] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cutting device for ring-hole sleeve parts, characterized in that, The cutting device is used to cut off the core material inside the annular sleeve when it rotates. An external cutting tool bar has a cutting window on it; An inner cutting blade bar is disposed within the outer cutting blade bar, and a first mounting groove is provided on the inner cutting blade bar; A cutting assembly is installed in the first mounting slot, the cutting assembly includes a cutting blade, the cutting blade being disposed in the first mounting slot; The drive assembly is connected to the inner cutting blade bar; In this process, after the annular sleeve material is fixed and driven to rotate by an external device, a portion of the cutting device is inserted into the annular hole of the annular sleeve material. The inner cutting bar is driven to move horizontally in the outer cutting bar by the driving assembly, so that a portion of the cutting assembly passes through the cutting window to cut the core material. The cutting device further includes a display component for displaying cutting information in real time during the cutting process. The display component includes: The pointer module is further provided with a second mounting slot on the inner cutting blade bar, and the pointer module is installed in the second mounting slot; A dial is fitted onto the outer cutting tool bar, and an indicator window is also provided on the outer cutting tool bar. The dial is provided with multiple scale lines. When the cutting assembly is cutting, part of the pointer module extends out of the indicator window to indicate the corresponding scale line to display the current cutting depth. The pointer module includes: The pointer is positioned in the second mounting slot; The second connector is inserted through the inner cutting blade bar, and the pointer is rotatably connected to the portion of the second connector located in the second mounting groove; The second guide member has a second guide groove on the pointer and is inserted through the outer cutting tool bar and the second guide groove. When the inner cutting blade bar is driven to move towards the bottom of the annular hole, the pointer moves synchronously with the cutting blade, and part of the pointer extends out of the indicator window to indicate the corresponding... The scale lines mentioned above.

2. The cutting device as described in claim 1, characterized in that, It also includes a plurality of first support members, which are arranged around the outer cutting blade and protrude from the outer cutting blade. When the outer cutting blade is located in the annular hole, the first support members abut against the inner wall of the annular hole to fix the outer cutting blade.

3. The cutting device as described in claim 1, characterized in that, The cutting component also includes: A first connector is inserted through the inner cutting blade bar, and the cutting blade is rotatably connected to the portion of the first connector located in the first mounting groove; The first guide member is provided with a first guide groove on the cutting blade, and the first guide member passes through the outer cutting blade bar and the first guide groove; When the inner cutting blade is driven to move towards the bottom of the annular hole, the part of the cutting blade guided by the first guide and the first guide groove passes through the cutting window to cut the inner wall of the annular hole.

4. The cutting device as described in claim 3, characterized in that, The dial has a notch, a plurality of scale lines are provided on a first side of the notch, and a plurality of scale values ​​corresponding to the plurality of scale lines are provided on a second side of the notch.

5. The cutting device as described in claim 1, characterized in that, The driving component includes: The first flange is installed on one end face of the inner cutting tool bar; A drive shaft, one end of which passes through the first flange and is inserted into one end of the inner cutting tool bar; A feed drive disk, with the other end of the drive shaft connected to the feed drive disk; The feed drive disk rotates, causing the transmission shaft to rotate, which in turn causes the first flange to drive the inner cutting bar to move.

6. The cutting device as described in claim 5, characterized in that, It also includes a support frame having a through hole, one end of which is fitted onto one end of the inner cutting tool bar, and the other end of which is fitted with a second flange. One end of the drive shaft passes through the through hole and the first flange and is inserted into one end of the inner cutting tool bar, and the other end of the drive shaft passes through the through hole and the second flange and is connected to the feed drive disc.

7. A method for cutting ring-hole sleeve parts, characterized in that, The cutting device applied to any one of claims 1-6 cuts off the core material inside the annular sleeve material during rotation by the cutting method, the cutting method comprising: The annular sleeve is fixed and driven to rotate by an external device; A portion of the cutting device is inserted into the annular hole of the annular sleeve material, and the outer cutting blade of the cutting device is fixed in the annular hole; The drive assembly of the cutting device drives the inner cutting bar of the cutting device to move horizontally in the outer cutting bar, so that a portion of the cutting assembly of the cutting device, which is located in the first mounting groove of the inner cutting bar, passes through the cutting window of the outer cutting bar to cut the core material.

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