An automatic chamfering device for inner and outer circles

Abstract

The present invention relates to an automatic chamfering device for inner and outer circles, which is applied in the technical field of chamfering inner and outer circles of injection molded products. The milling assembly includes a milling cutter disc, a driving member and a lifting member. The lifting member is arranged on one side edge of the upper end face of the base plate. The lower end face of the milling cutter disc is detachably provided with inner and outer milling cutters. The inner and outer milling cutters are both provided with multiple and evenly distributed along the circumference of the milling cutter disc. The loading assembly includes a fixed seat and a moving member that drives the fixed seat to move to the bottom of the milling cutter disc. The fixed seat is used to hold the product to be milled and chamfered; the clamping assembly is used to clamp and fix the product placed in the fixed seat, and it includes a clamping tube and a connecting member that fixes the clamping tube under the milling cutter disc; it has a high degree of automation and is simple and convenient to operate; by arranging the inner and outer milling cutters, the inner and outer chamfers of the product can be milled simultaneously, thereby improving the milling efficiency and effect.

Description

Technical Field

[0001] The invention is applied in the technical field of internal and external chamfering of injection-molded products, and particularly relates to an automatic internal and external chamfering device. Background Art

[0002] refer to Figures 7 to 9 For the injection-molded product 3, the a and b surfaces on the product 3 need to be rounded according to the actual application situation. However, due to the thin wall thickness of this product 3, it is not easy to round the product during injection molding. Therefore, it is necessary to round the product through a rounding device after the product is injection-molded and cooled.

[0003] Existing Chinese patent publication number "CN105014100B" discloses a device and method for internal and external chamfering of cemented carbide pipe blanks. This device is suitable for processing internal and external chamfers on thick-walled products. However, when milling internal and external chamfers on thin-walled products, product positioning is inaccurate, the product is easily deformed, and the scrap rate of the chamfered products is high. Therefore, there is a need for a device for internal and external chamfering of thin-walled injection molded products. Summary of the Invention

[0004] The object of the present invention is to provide an automatic chamfering device which can realize internal and external chamfering of injection-molded products with thin walls and improve the chamfering efficiency and chamfering quality of the products.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention provides an automatic chamfering device for inner and outer circles, comprising a base plate, on which are provided:

[0007] A milling assembly, comprising a milling cutter disc, a driving member for driving the milling cutter disc to rotate, and a lifting member for driving the driving member to move longitudinally, wherein the lifting member is arranged on one side edge of the upper end surface of the substrate, and the lower end surface of the milling cutter disc is detachably provided with inner and outer milling cutters, wherein the inner and outer milling cutters are provided with a plurality of the inner and outer milling cutters and are evenly distributed along the circumference of the milling cutter disc, the inner milling cutter is used for milling the inner chamfer of the product, and the outer milling cutter is used for milling the outer chamfer of the product;

[0008] A loading assembly, comprising a fixed seat and a moving member that drives the fixed seat to move below the milling cutter disc, wherein the fixed seat is used to hold the product to be milled and chamfered;

[0009] A pressing assembly is used to press and fix the product placed in the fixing seat, and includes a pressing tube and a connecting piece for fixing the pressing tube under the milling cutter disc.

[0010] Furthermore, the milling cutter disc is a disc-shaped structure, and the upper end surface of the milling cutter disc is provided with a connecting block connected to the rotating end of the driving member. The outer diameter of the milling cutter disc is larger than the diameter of the circle surrounded by the outer layer of the milling cutters.

[0011] Furthermore, the cross-section of the fixing seat is U-shaped, and a protrusion for positioning the product is provided at the inner bottom end of the fixing seat. After the product is placed in the fixing seat, the protrusion is embedded in the interior of the product.

[0012] Furthermore, the moving part includes a slide rail arranged on the base plate, a slider slidably connected to the slide rail and a driving cylinder, the fixed seat is arranged on the slider, the driving cylinder is arranged on the base plate and located on one side of the lifting part, and the telescopic end of the driving cylinder is connected to the fixed seat.

[0013] Furthermore, the connecting member includes a mounting rod and a compression spring sleeved on the mounting rod, the upper part of the mounting rod slides through the milling cutter disc, and the connecting block is fixed in the rotating shaft of the driving member, and the lower end surface of the milling cutter disc is provided with an embedding groove that cooperates with the top end of the spring, and the embedding groove extends upward into the connecting block, and the lower end of the compression spring abuts against the upper end surface of the compression tube, and the lower part of the mounting rod extends downward into the compression tube, and the mounting rod is located in the compression tube and is provided with a supporting block that supports the compression tube, and the diameter of the supporting block is larger than the diameter of the mounting rod.

[0014] Furthermore, a guide member is provided between the compression tube and the compression spring to guide the longitudinal movement of the mounting rod, and the guide member includes a guide block and a guide bearing which are provided on the upper end surface of the outer portion of the compression tube and are integrally formed therewith. A guide hole which is connected to the compression tube is longitudinally provided in the guide block, and the support block is loosely fitted in the guide hole. The guide bearing is embedded in the upper part of the guide hole, and the outer diameter of the guide bearing is larger than the inner diameter of the guide hole. The mounting rod is loosely fitted in the inner circle of the guide bearing.

[0015] Furthermore, the lower end of the mounting rod extends downward and extends out of the clamping tube, and a positioning groove cooperating with the mounting rod is longitudinally provided in the protrusion, and the axes of the positioning groove, the mounting rod, the guide hole and the guide bearing are located on the same straight line.

[0016] Furthermore, a bearing pressure block is provided between the guide bearing and the compression spring, the bearing pressure block is connected to the upper end surface of the guide block and the outer diameter of the bearing pressure block is larger than the outer diameter of the bearing, the mounting rod slides through the bearing pressure block, and the bottom end of the compression spring abuts against the upper end surface of the bearing pressure block.

[0017] Furthermore, a through hole for installing the milling cutter is provided at a position corresponding to each milling cutter on the milling cutter disc, and a threaded hole connected to the through hole is provided on the outer circumference of the milling cutter disc, and a headless screw is threadedly connected to the threaded hole, and the end of the headless screw is pressed against the milling cutter.

[0018] Furthermore, the milling cutter is made of tungsten steel.

[0019] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] An automatic inner and outer circle chamfering device of the present invention includes a base plate, on which a milling assembly, a loading assembly and a pressing assembly are arranged, the milling assembly includes a milling cutter disc, a driving member for driving the milling cutter disc to rotate and a lifting member for driving the driving member to move longitudinally, the lifting member is arranged on one side edge of the upper end face of the base plate, the lower end face of the milling cutter disc is detachably provided with inner and outer milling cutters, the inner and outer layers of the milling cutters are both provided with multiple and evenly distributed along the circumference of the milling cutter disc, the inner layer of the milling cutter is used for milling the inner chamfer of the product, and the outer layer of the milling cutter is used for milling the outer chamfer of the product; the automatic inner and outer circle chamfering device of this structure can realize automatic milling of the product, has a high degree of automation, and is simple and convenient to operate; by arranging the inner and outer layer milling cutters, the inner and outer chamfers of the product can be milled simultaneously, thereby improving the milling efficiency.

[0021] Furthermore, the milling cutter disc is a disc-shaped structure, and the outer diameter of the milling cutter disc is larger than the diameter of the circle surrounded by the outer milling cutter. When performing internal and external chamfering milling on the product, the milling cutter disc with a larger diameter can block the waste milled and prevent the waste from splashing everywhere; at the same time, it also protects the on-site operators, preventing the inner and outer milling cutters from accidentally injuring workers, thereby reducing safety hazards in the production process.

[0022] Furthermore, the loading assembly includes a fixed base and a moving member that drives the fixed base to move below the milling cutter disc. The fixed base has a U-shaped cross-section, and a protrusion is provided at the bottom of the fixed base to position the product. The clamping assembly includes a clamping tube and a connecting member that fixes the clamping tube below the milling cutter disc. The combination of the clamping tube and the protrusion in this structure firmly fixes the product in the fixed base, preventing it from rotating during internal and external chamfering.

[0023] Furthermore, the bottom end of the mounting rod extends downward and out of the compression tube. A positioning groove is longitudinally provided within the protrusion to mate with the mounting rod. The axes of the positioning groove, mounting rod, guide hole, and guide bearing are aligned. When milling inner and outer chamfers on a product, the positioning groove, guide hole, and guide bearing ensure that the mounting rod and the milling cutter disc rotate concentrically and coaxially, improving the milling accuracy of the inner and outer milling cutters, and enhancing both milling quality and yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0025] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 is a cross-sectional view of the overall structure of an embodiment of the present invention;

[0028] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0029] Figure 5 This is a cross-sectional view of the cooperation relationship between the milling assembly and the pressing assembly in an embodiment of the present invention;

[0030] Figure 6 This is a structural diagram of the milling assembly in the embodiment of the present invention when milling a product;

[0031] Figure 7 It is a structural diagram of a product in an embodiment of the present invention;

[0032] Figure 8 This is a cross-sectional view of the structure of the product in the embodiment of the present invention;

[0033] Figure 9 yes Figure 7 Enlarged view of point C in the middle.

[0034] The description of the accompanying drawings is as follows:

[0035] 1. Substrate;

[0036] 2. Milling assembly; 21. Milling cutter disc; 22. Driving member; 23. Lifting member; 24. Milling cutter; 241. Inner milling cutter; 242. Outer milling cutter; 25. Connecting block;

[0037] 3. Products;

[0038] 4. Loading assembly; 41. Fixed seat; 42. Moving part; 421. Slide rail; 422. Slider; 423. Driving cylinder; 43. Bump; 44. Connecting plate;

[0039] 5. Compression assembly; 51. Compression tube; 52. Connector; 521. Mounting rod; 522. Compression spring;

[0040] 6. Embed grooves;

[0041] 7. Support block;

[0042] 8. Guide member; 81. Guide block; 82. Guide bearing; 83. Guide hole;

[0043] 9. Positioning slot;

[0044] 10. Bearing block;

[0045] 11. Through hole;

[0046] 12. Threaded hole;

[0047] 13. Headless screws. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] refer to Figures 1 to 4 , an automatic chamfering device for inner and outer circles provided by the present invention, comprising a substrate 1, on which are provided:

[0052] The milling assembly 2 includes a milling cutter disc 21, a driving member 22 for driving the milling cutter disc 21 to rotate, and a lifting member 23 for driving the driving member 22 to move longitudinally. The lifting member 23 is arranged on one edge of the upper end surface of the substrate 1. The driving member 22 can adopt a driving motor to drive the milling cutter disc 21 to rotate. The lifting member 23 can adopt a lifting cylinder to drive the driving member 22 to move longitudinally through the lifting cylinder, thereby driving the milling cutter disc 21 to move longitudinally. The lower end surface of the milling cutter disc 21 is detachably provided with inner and outer milling cutters 24. There are multiple inner and outer milling cutters 24 and they are evenly distributed along the circumference of the milling cutter disc 21. The inner milling cutter 241 is used to mill the inner chamfer of the product 3, and the outer milling cutter 241 is used to mill the outer chamfer of the product 3. By setting the inner and outer milling cutters 24, the inner and outer chamfers of the product 3 can be milled simultaneously, thereby improving the milling efficiency. In this embodiment, there are two inner milling cutters 241 and two outer milling cutters 242. The inner milling cutter 241 and the outer milling cutter 242 are arranged opposite to each other. The inner and outer milling cutters 24 are both made of tungsten steel.

[0053] refer to Figures 1 to 4 The milling cutter disc 21 is a disc-shaped structure. The upper end surface of the milling cutter disc 21 is provided with a connecting block 25 connected to the rotating end of the driving member 22. The outer diameter of the milling cutter disc 21 is larger than the diameter of the circle surrounded by the outer milling cutter 242. When performing internal and external chamfer milling on the product 3, the milling cutter disc 21 with a larger diameter can block the waste milled to prevent the waste from splashing everywhere; at the same time, it also protects the on-site operators, preventing the inner and outer milling cutters 24 from accidentally injuring workers, thereby reducing safety hazards in the production process.

[0054] refer to Figure 1 and Figure 2 The loading assembly 4 includes a fixed seat 41 and a moving member 42 that drives the fixed seat 41 to move to the bottom of the milling cutter disc 21. The fixed seat 41 is used to hold the product 3 to be milled and chamfered. The cross-section of the fixed seat 41 is U-shaped. The bottom end of the inner part of the fixed seat 41 is provided with a protrusion 43 for positioning the product 3. After the product 3 is placed in the fixed seat 41, the protrusion 43 is embedded in the interior of the product 3, and the product 3 is positioned by the protrusion 43.

[0055] The moving part 42 includes a slide rail 421 arranged on the base plate 1, a slider 422 slidably connected to the slide rail 421 and a driving cylinder 423. The fixed seat 41 is arranged on the slider 422, and the driving cylinder 423 is arranged on the base plate 1 and is located on one side of the lifting member 23. A connecting plate 44 is provided on the side of the fixed seat 41, and a connecting plate 44 is also provided at the end of the telescopic end of the driving cylinder 423. The two connecting plates 44 are connected by bolts. The moving part 42 of this structure has a simple structure, is easy to process and manufacture, and works more stably. The moving part 42 can also adopt a ball screw, a slider slidably connected to the ball screw and a motor that drives the ball screw to rotate. The fixed seat 41 is installed on the slider.

[0056] refer to Figures 1 to 4 The clamping assembly 5 is used to clamp and fix the product 3 placed in the fixing seat 41. It includes a clamping tube 51 and a connector 52 that fixes the clamping tube 51 under the milling cutter disc 21. The inner and outer diameters of the clamping tube 51 gradually increase from top to bottom. The outer diameter of the bottom end of the clamping tube 51 matches the inner diameter of the product 3. When the product 3 is clamped, the milling cutter disc 21 is driven downward by the lifting member 23, and the clamping tube 51 is embedded in the product 3 until its bottom end contacts the inner bottom end face of the product 3. The combination of the clamping tube 51 and the protrusion 43 of this structure firmly fixes the product 3 in the fixing seat 41. When the product 3 is subjected to internal and external chamfering, the product 3 is not easily rotated.

[0057] refer to Figure 3 、 Figure 4 and Figure 5The top of the clamping spring 522 is fixed in the embedded groove 6, and the lower end of the clamping groove 6 extends upward into the connecting block 25, and the top of the clamping spring 522 is fixed in the embedded groove 6. The lower end of the clamping pipe 51 is abutted against the upper end surface of the clamping pipe 51, and the lower end of the clamping pipe 51 is loosely matched with the clamping pipe 51. The mounting rod 521 is provided with a supporting block 7 in the clamping pipe 51, and the diameter of the supporting block 7 is larger than the diameter of the mounting rod 521. The connecting piece 51 of this structure can realize the pressing tube 51 to be installed under the milling cutter disc 21, that is, the pressing tube 51 is connected by the pressing spring 522. When the product 3 is fixed, the milling cutter disc 21 and the pressing assembly 5 are moved downward by the lifting piece 23, and the bottom of the pressing tube 51 is pressed against the product 3. Since the mounting rod 521 is slidably connected to the pressing tube 51, when the lifting piece 23 continues to drive the milling cutter disc 21 and the mounting rod 521 to continue to move downward, the inner and outer milling cutters 24 are moved to the position where the inner and outer chamfers of the product 3 are to be milled, the pressing spring 522 is in In the compressed state, the compression spring 522 in the compressed state applies a downward pressure to the compression tube 51 and transmits it to the product 3 placed in the fixed seat 41. At this time, the product 3 is positioned and fixed by the fixed seat 41, the protrusion 43 and the compression tube 51. When the driving member 22 drives the inner and outer layer milling cutters 24 to perform inner and outer chamfering milling on the product 3, the product 3 is not easy to rotate or move; when the milling is completed, the milling cutter disc 21 and the mounting rod 521 are driven to move upward in the longitudinal direction through the lifting member 23, and the compression tube 51 also moves upward under the action of the support block 7 and separates from the product 3.

[0058] refer to Figure 3 、 Figure 4 and Figure 5 A guide member 8 is provided between the compression tube 51 and the compression spring 522 to guide the longitudinal movement of the mounting rod 521. The guide member 8 includes a guide block 81 and a guide bearing 82, which are integrally formed with the outer upper end surface of the compression tube 51. A guide hole 83 is longitudinally provided in the guide block 81 and communicates with the compression tube 51. The support block 7 is loosely fitted within the guide hole 83. The guide bearing 82 is embedded in the upper portion of the guide hole 83. The outer diameter of the guide bearing 82 is larger than the inner diameter of the guide hole 83, and the mounting rod 521 and the inner diameter of the guide bearing 82 are loosely fitted. When the mounting rod 521 moves longitudinally with the milling cutter disc 21, the guide bearing 82 and the guide hole 83 guide the longitudinally moving mounting rod 521, thereby improving the stability of its longitudinal movement and preventing it from shaking or deflecting.

[0059] refer to Figure 3 and Figure 4 The bottom end of the mounting rod 521 extends downward and out of the compression tube 51. A positioning groove 9 is longitudinally provided in the protrusion 43 to cooperate with the mounting rod 521. The axes of the positioning groove 9, the mounting rod 521, the guide hole 83, and the guide bearing 82 are located on the same straight line. When the inner and outer milling cutters 24 move to the position for milling the inner and outer chamfers of the product 3, the mounting rod 521 is inserted into the positioning groove 9. When milling the inner and outer chamfers of the product 3, the positioning groove 9, the guide hole 83, and the guide bearing 82 ensure that the mounting rod 521 and the milling cutter disc 21 rotate concentrically and coaxially, thereby improving the milling accuracy of the inner and outer milling cutters 24 on the product 3, and improving the milling quality and yield rate of the product 3.

[0060] refer to Figure 3 、 Figure 4 and Figure 5 A bearing pressing block 10 is provided between the guide bearing 82 and the compression spring 522. The bearing pressing block 10 is connected to the upper end surface of the guide block 81 and the outer diameter of the bearing pressing block 10 is larger than the outer diameter of the guide bearing 82. The mounting rod 521 slides through the bearing pressing block 10, and the bottom end of the compression spring 522 abuts against the upper end surface of the bearing pressing block 10. The bearing pressing block 10 plays a sealing role to prevent the waste material after milling from being stuck in the guide bearing 82, thereby ensuring the normal operation of the guide bearing 82.

[0061] refer to Figure 5 、 Figure 6 and Figure 7 The milling cutter disc 21 is provided with a through hole 11 corresponding to each milling cutter 24, and a threaded hole 12 connected to the through hole 11 is provided on the outer surface of the milling cutter disc 21. A headless screw 13 is connected to the inner thread of the threaded hole 12, and the end of the headless screw 13 is pressed against the milling cutter 24. The headless screw 13 is used to fix the milling cutter 24, and the height of the milling cutter 24 can be easily adjusted. After the milling cutter 24 is fixed, the headless screw 13 is embedded in the threaded hole 12 and does not leak out, which can prevent accidental injury to on-site workers. The cooperation between the headless screw 13 and the threaded hole 12 allows for quick installation and removal of the milling cutter 24. When only the outer cylindrical surface of the product 3 needs to be chamfered, the inner milling cutter 241 can be removed. Similarly, when only the inner chamfer of the product 3 needs to be performed, the outer milling cutter 242 can be removed.

[0062] refer to Figures 1 to 4, the specific usage is to move the fixed seat 41 to the loading position through the moving part 42, place the product 3 to be chamfered in the fixed seat 41 and move it to the bottom of the milling cutter disc 21 through the moving part 42, and the lifting part 23 drives the driving part 22 and the milling cutter disc 21 connected to the rotating shaft of the driving part 22, and the pressing component 5 to move downward at the same time, first, the bottom of the pressing tube 51 is pressed against the product 3, and the lifting part 23 continues to drive the milling cutter disc 21 and the pressing component 5 to move downward so that the inner and outer milling cutters 24 move to the product 3 to be milled. At the chamfering position, the clamping spring 522 is in a compressed state and applies a downward pressure to the clamping tube 51 and transmits it to the product 3. The product 3 is fixed under the action of the clamping tube 51 and the inner protrusion 43 of the fixing seat 41; thereafter, the driving member 23 drives the milling disc 21 and the inner and outer milling cutters 24 on the milling disc 21 to rotate, thereby completing the milling of the inner and outer chamfers of the product 3. After the milling is completed, the lifting member 23 drives the driving member 22, the milling disc 21 and the clamping assembly 5 to move upward and away from the product.

[0063] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic chamfering device for inner and outer circles, comprising a base plate (1), characterized in that: The substrate (1) is provided with: A milling assembly (2), the milling assembly (2) comprising a milling cutter disc (21), a driving member (22) for driving the milling cutter disc (21) to rotate, and a lifting member (23) for driving the driving member (22) to move longitudinally, the lifting member (23) being arranged on one side edge of the upper end surface of the substrate (1), the lower end surface of the milling cutter disc (21) being detachably provided with inner and outer milling cutters (24), a plurality of the inner and outer milling cutters (24) being provided and uniformly distributed along the circumference of the milling cutter disc (21), the inner milling cutter (24) being used for milling inner chamfers of a product (3), and the outer milling cutter (24) being used for milling outer chamfers of a product (3); A loading assembly (4), the loading assembly (4) comprising a fixed seat (41) and a moving member (42) for driving the fixed seat (41) to move below the milling cutter disc (21), the fixed seat (41) being used to hold the product (3) to be milled and chamfered; A pressing assembly (5), the pressing assembly (5) is used to press and fix the product (3) placed in the fixing seat (41), and comprises a pressing tube (51) and a connecting piece (52) for fixing the pressing tube (51) below the milling cutter disc (21); The connecting member (52) includes a mounting rod (521) and a compression spring (522) sleeved on the mounting rod (521), the upper part of the mounting rod (521) slides through the milling cutter disc (21), the connecting block (25) is fixed in the rotating shaft of the driving member (22), the lower end surface of the milling cutter disc (21) is provided with an embedding groove (6) that cooperates with the top end of the compression spring (522), the embedding groove (6) extends upward into the connecting block (25), the lower end of the compression spring (522) abuts against the upper end surface of the compression tube (51), the lower part of the mounting rod (521) extends downward into the compression tube (51), and a supporting block (7) that supports the compression tube (51) is provided on the mounting rod (521) and located in the compression tube (51), and the diameter of the supporting block (7) is larger than the diameter of the mounting rod (521).

2. The automatic chamfering device for inner and outer circles according to claim 1, characterized in that: The milling cutter disc (21) is a disc-shaped structure. The upper end surface of the milling cutter disc (21) is provided with a connecting block (25) connected to the rotating end of the driving member (22). The outer diameter of the milling cutter disc (21) is larger than the diameter of the circle formed by the outer milling cutters (24).

3. The automatic chamfering device for inner and outer circles according to claim 1, characterized in that: The fixing seat (41) has a U-shaped cross section, and a protrusion (43) for positioning the product (3) is provided at the bottom end of the fixing seat (41). After the product (3) is placed in the fixing seat (41), the protrusion (43) is embedded in the interior of the product (3).

4. The automatic chamfering device for inner and outer circles according to claim 1, characterized in that: The moving member (42) includes a slide rail (421) arranged on the base plate (1), a slider (422) slidably connected to the slide rail (421), and a driving cylinder (423); the fixed seat (41) is arranged on the slider (422); the driving cylinder (423) is arranged on the base plate (1) and is located on one side of the lifting member (23); and the telescopic end of the driving cylinder (423) is connected to the fixed seat (41).

5. The automatic chamfering device for inner and outer circles according to claim 1, characterized in that: A guide member (8) is provided between the compression tube (51) and the compression spring (522) for guiding the longitudinal movement of the mounting rod (521). The guide member (8) includes a guide block (81) and a guide bearing (82) which are provided on the upper end surface of the outer portion of the compression tube (51) and are integrally formed therewith. A guide hole (83) communicating with the compression tube (51) is longitudinally provided in the guide block (81). The support block (7) is clearance-fitted in the guide hole (83). The guide bearing (82) is embedded in the upper portion of the guide hole (83). The outer diameter of the guide bearing (82) is larger than the inner diameter of the guide hole (83). The mounting rod (521) is clearance-fitted with the inner circle of the guide bearing (82).

6. The automatic chamfering device for inner and outer circles according to claim 1, characterized in that: The lower end of the mounting rod (521) extends downward and out of the compression tube (51), and a positioning groove (9) cooperating with the mounting rod (521) is longitudinally provided in the fixing seat (41), and the axes of the positioning groove (9), the mounting rod (521), the guide hole (83) and the guide bearing (82) are located on the same straight line.

7. The automatic chamfering device for inner and outer circles according to claim 5, characterized in that: A bearing pressing block (10) is provided between the guide bearing (82) and the pressing spring (522), the bearing pressing block (10) is connected to the upper end surface of the guide block (81) and the outer diameter of the bearing pressing block (10) is larger than the outer diameter of the guide bearing (82), the mounting rod (521) slides through the bearing pressing block (10), and the bottom end of the pressing spring (522) abuts against the upper end surface of the bearing pressing block (10).

8. The automatic chamfering device for inner and outer circles according to claim 1 or 2, characterized in that: A through hole (11) for mounting the milling cutter (24) is provided at a position corresponding to each milling cutter (24) on the milling cutter disc (21), a threaded hole (12) connected to the through hole (11) is provided on the outer circumference of the milling cutter disc (21), a headless screw (13) is connected to the inner thread of the threaded hole (12), and the end of the headless screw (13) is pressed against the milling cutter (24).

9. The automatic chamfering device for inner and outer circles according to claim 8, characterized in that: The milling cutter (24) is made of tungsten steel.

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