A center hole grinding machine

Abstract

This utility model discloses a center hole grinding machine, belonging to the field of material processing technology. It includes a slide rail body, a head ejector seat and a tail ejector seat oppositely disposed at both ends of the slide rail body and slidably connected to the slide rail body via a slider, a front processing ejector fixed inside the head ejector seat, a rear processing ejector located inside the tail ejector seat, and a chuck for clamping shaft-machined parts. The slider is equipped with a locking component. The tail ejector seat is equipped with an elastic pressing assembly that drives the rear processing ejector to move axially. A dial is rotatably connected to the outside of the front processing ejector via a bearing. A lever is fixed on the dial for driving the chuck to rotate coaxially. A continuously variable motor for driving the dial is installed on the head ejector seat. This utility model improves the grinding uniformity and processing accuracy of the two electrode machining holes, ensuring the coaxiality of the center hole after grinding.

Description

Technical Field

[0001] This utility model relates to the field of materials processing technology, and in particular to a center hole grinding machine. Background Technology

[0002] In high-precision shaft grinding, it is necessary to grind the center of the shaft to form a center hole, ensuring a stable contact area and improving roundness. Traditionally, the center holes for materials are drilled and ground manually using a center drill before being used directly on a grinding machine. However, for cemented carbide materials, due to their high hardness, traditional center drills cannot directly process them. It is necessary to first use electrodes to discharge electricity to both ends of the workpiece to create holes, and then grind each hole separately using a center drill. However, this method cannot guarantee uniform grinding of the two holes, resulting in roundness errors that affect the coaxiality of the two center holes after grinding. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a center hole grinding machine.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A center hole grinding machine includes a slide rail body, a head ejector seat and a tail ejector seat opposite to each other at both ends of the slide rail body and slidably connected to the slide rail body via a slider, a front processing ejector fixed inside the head ejector seat, a rear processing ejector located inside the tail ejector seat and coaxially arranged with the front processing ejector, and a chuck for clamping a shaft-machined part. The slider is provided with a locking member for fixing the slider position. The tail ejector seat is provided with an elastic pressing assembly for driving the rear processing ejector to move axially. A dial is rotatably connected to the outside of the front processing ejector via a bearing. A lever for driving the chuck to rotate coaxially is fixed on the dial. A continuously variable motor for driving the dial to rotate is installed on the head ejector seat. The coaxially arranged front and rear machining pins respectively connect to the two electrode machining holes of the shaft system machining part. The continuously variable speed electrode drives the dial to rotate, and the dial drives the shaft system machining part to rotate through the lever, so as to realize the synchronous grinding of the two electrode machining holes. Under the drive of the elastic pressing component, the depth of the grinding hole gradually increases, thereby improving the grinding uniformity and machining accuracy of the two electrode machining holes and ensuring the coaxiality of the center hole after grinding.

[0006] The elastic pressing assembly includes a sliding shaft, a pull rod, a spring, and an adjusting nut. An axial groove is provided in the tail ejector seat to slide with the sliding shaft. The post-processed ejector is fixed to the front end of the sliding shaft. The pull rod is fixed to the rear end of the sliding shaft and extends through the tail ejector seat. The pull rod has an external thread on its outer side to cooperate with the adjusting nut. A limiting plate is fixed at the through-hole of the tail ejector seat to restrict the adjusting nut from entering the transverse groove. The spring is sleeved on the pull rod in the axial groove, and its two ends abut against the pull rod and the limiting plate, respectively.

[0007] The tail ejector seat is equipped with a quick-release assembly, which includes an ear seat fixed to the tail ejector seat and a pressure rod rotatably connected to the ear seat. An outer expansion plate is fixed to the outer end of the pull rod, and a rocker arm is fixed to one end of the pressure rod, which abuts against the inner side of the outer expansion plate. Through the lever action of the pressure rod, the pull rod can be quickly driven to move outward, thereby removing the ground shaft part.

[0008] The head ejector seat and the tail ejector seat are equipped with self-centering clamping assemblies. Each self-centering clamping assembly includes a slide block that slides in conjunction with the slide rail body and at least two self-centering clamps fixed to the slide block. The axis of each self-centering clamp is located on the coaxial axis of the pre-processing ejector and the post-processing ejector. The self-centering clamping assembly clamps the outer circumference of the shaft-machined part to ensure the coaxiality of the shaft-machined part with the pre-processing and post-processing ejector pins, thus adjusting for the effects of coaxial deviation caused by the two electrode machining holes.

[0009] The self-centering fixture includes an outer fixed ring fixed on the slide, an inner adjusting ring located inside the outer fixed ring and rotating coaxially with respect to the outer fixed ring, and three positioning claws distributed circumferentially along the outer fixed ring. The distal end of each positioning claw is equipped with a positioning roller that rolls in contact with the surface of the shaft-machined part. The proximal end of each positioning claw is rotatably connected to the outer adjusting ring via a rotating shaft and connected to the inner adjusting ring via a driving member. Under the rotation of the inner adjusting ring, each positioning roller is driven to move away from / near the axis of the outer adjusting ring. The inner adjusting ring is provided with a second locking member for locking the rotation angle of the inner adjusting ring.

[0010] The outer fixing ring has a rotating groove on its outer side that mates with the inner adjusting ring, and the outer fixing ring has an opening groove on its inner side that allows the positioning claw to move. The rotating shaft is fixed on the inner wall near the opening groove. The driving component includes a driving part formed near the positioning claw and a fixed shaft fixed on the driving part. The inner adjusting ring has a curved groove that allows the driving part to move, and the curved groove has a radial sliding groove that mates with the fixed shaft.

[0011] The locking component is a locking bolt, and the inner adjusting ring has a threaded hole. After the locking bolt is connected to the threaded hole, it is pressed against the inner wall of the rotating groove.

[0012] The inner side of the outer fixed ring has a clearance opening adapted to the positioning roller, and the clearance opening is connected to the far end of the opening slot. The clearance opening and the opening slot can completely accommodate the positioning claw and the positioning roller to ensure that there is sufficient space within the self-centering fixture to remove the shaft machining parts.

[0013] This invention has the following advantages: The present invention uses a front machining pin and a rear machining pin arranged coaxially to connect to the two electrode machining holes of the shaft machining part. The continuously variable speed electrode drives the dial to rotate, and the dial drives the shaft machining part to rotate through the lever, so as to realize the synchronous grinding of the two electrode machining holes. Under the drive of the elastic pressing component, the depth of the grinding hole gradually increases, thereby improving the grinding uniformity and processing accuracy of the two electrode machining holes and ensuring the coaxiality of the center hole after grinding. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 This is a partial schematic diagram of the head ejector pin seat in this utility model;

[0018] Figure 4 for Figure 2 A magnified view of part A in the image;

[0019] Figure 5 This is a schematic diagram of the self-centering clamp in this utility model;

[0020] Figure 6 This is a cross-sectional view of the self-centering clamp of this utility model;

[0021] Figure 7 This is a front view of the self-centering clamp of this utility model after removing a portion of the outer fixing ring.

[0022] 1. Slide rail body; 101. Slider; 2. Head ejector pin seat; 3. Tail ejector pin seat; 301. Axial groove; 4. Front-machined ejector pin; 5. Rear-machined ejector pin; 6. Dial; 601. Dial lever; 7. Continuously variable speed electrode; 701. Synchronous belt; 8. Elastic pressing assembly; 801. Slide shaft; 802. Pull rod; 8021. Outer expansion plate; 803. Adjusting nut; 804. Spring; 805. Limiting plate; 9. Heart-shaped clamp; 10. Shaft system machined parts; 11. Slide seat; 12. Self-centering Fixture; 1201, outer fixing ring; 12011, opening slot; 12012, clearance opening; 1202, inner adjusting ring; 12021, toggle block; 12022, radial slide groove; 12023, curved surface groove; 1203, positioning claw; 12031, rotating shaft; 12032, drive unit; 12033, fixed shaft; 1204, positioning roller; 1205, locking bolt; 13, pull rod quick-opening assembly; 1301, ear seat; 1302, pressure rod; 1303, rocker piece. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] like Figure 1 and Figure 2As shown, this utility model provides a center hole grinding machine, including a slide rail body 1, a head ejector seat 2 and a tail ejector seat 3 oppositely disposed at both ends of the slide rail body 1 and slidably connected to the slide rail body 1 via a slider 101, a front machining ejector 4 fixed inside the head ejector seat 2, a rear machining ejector 5 located inside the tail ejector seat 3 and coaxially disposed with the front machining ejector 4, and a chuck 9 for clamping a shaft machining part 10. The slider 101 is provided with a locking member for fixing the position of the slider 101. Specifically, the locking member is a set screw. A threaded hole is opened at the corresponding position of the slider 101, and the set screw passes through the threaded hole and is connected to the slide rail body 1. The body 1 contacts the side to lock the positions of the head ejector seat 2 and the tail ejector seat 3. At this time, the coaxially arranged front machining ejector 4 and rear machining ejector 5 respectively connect to the two electrode machining holes of the shaft machining part 10, thereby completing the machining clamping of the shaft machining part 10. Preferably, in order to achieve grinding of cemented carbide material, the front machining ejector 4 and rear machining ejector 5 selected in this solution are made of diamond ejector material; the outer side of the front machining ejector 4 is rotatably connected to the dial 6 via a bearing. The dial 6 is fixed with a lever 601 for driving the coaxial rotation of the heart-shaped clamp 9. The head ejector seat 2 is equipped with a continuously variable motor 7 that drives the dial 6 to rotate; specifically, as shown in Figure 3 As shown, the outer side of the heart-shaped clamp 9 is formed with an extension rod, which is mounted on the lever 601. A drive pulley is fixed on the output shaft of the continuously variable motor. The outer side of the dial 6 has a driven pulley, and the drive pulley and the driven pulley are connected by a synchronous belt 701. As the continuously variable motor 7 starts, the dial 6 drives the heart-shaped clamp 9 and the shaft processing part 10 to rotate via the lever 601, thereby realizing the synchronous grinding of the two electrode processing holes. Furthermore, the tail ejector seat 3 is provided with an elastic pressing component 8 that drives the post-processing ejector 5 to move axially. Under the drive of the elastic pressing component 8, the processing depth of the two grinding holes gradually increases synchronously, thereby improving the grinding uniformity and processing accuracy of the two electrode processing holes, thus ensuring the coaxiality of the center hole after grinding.

[0027] like Figure 4As shown, specifically, the elastic pressing assembly 8 includes a sliding shaft 801, a pull rod 802, a spring 804, and an adjusting nut 803. The tail ejector seat 3 has an axial groove 301 that slides with the sliding shaft 801. The post-processed ejector pin 5 is fixed to the front end of the sliding shaft 801. The pull rod 802 is fixed to the rear end of the sliding shaft 801 and extends through the tail ejector seat 3. The pull rod 802 has an external thread that mates with the adjusting nut 803. A limiting plate 805 is fixed at the through-hole of the tail ejector seat 3 to restrict the adjusting nut 803 from entering the transverse groove. The spring... The spring 804 is fitted onto the pull rod 802 within the axial groove 301, with both ends abutting against the pull rod 802 and the limiting plate 805 respectively. Before clamping the shaft machining part 10, the pull rod 802 is pulled outward a certain distance and the adjusting screw is rotated to contact the limiting plate 805. At this time, the spring 804 is in a compressed state. After the front machining pin 4 and the rear machining pin 5 complete the docking with the shaft machining part 10, the adjusting nut 803 is loosened to the initial position. As the grinding proceeds, the spring 804 will provide an axial thrust to the rear machining pin 5, thereby enabling the front machining pin 4 and the rear machining pin 5 to be processed at the same depth.

[0028] More preferably, the tail ejector seat 3 is provided with a pull rod quick-opening assembly 13. The pull rod quick-opening assembly 13 includes an ear seat 1301 fixed on the tail ejector seat 3 and a pressure rod 1302 rotatably connected to the ear seat 1301. An outer expansion plate 8021 is fixed to the outer end of the pull rod 802, and a rocker arm 1303 that abuts against the inner side of the outer expansion plate 8021 is fixed to one end of the pressure rod 1302. Through the leverage action of the pressure rod 1302, the pull rod 802 can be quickly driven to move outward, thereby removing the ground shaft machining part 10.

[0029] like Figure 1 As shown, in order to adjust the influence of the coaxial deviation of the two electrode machining holes of the shaft machining part 10 caused by the motor hole opening process, the head ejector seat 2 and the tail ejector seat 3 are provided with self-centering clamping assemblies. The self-centering clamping assembly includes a slide seat 11 that slides with the slide rail body 1 and at least two self-centering clamps 12 fixed on the slide seat 11. The axis of the self-centering clamp 12 is located on the coaxial axis of the front machining ejector 4 and the rear machining ejector 5. The self-centering clamping assembly completes the clamping of the outer circumference of the shaft machining part 10, and cooperates coaxially with the front machining ejector 4 and the rear machining ejector 5 to ensure the coaxiality of the shaft machining part 10 with the machining ejector and the rear machining ejector 5, and to ensure the machining accuracy.

[0030] like Figure 5As shown, the self-centering fixture 12 includes an outer fixing ring 1201 fixed on the slide 11, an inner adjusting ring 1202 located inside the outer fixing ring 1201 and coaxially rotating relative to the outer fixing ring 1201, and three positioning claws 1203 distributed circumferentially along the outer fixing ring 1201. The distal end of each positioning claw 1203 is equipped with a positioning roller 1204 that rolls in contact with the surface of the shaft machining part 10. Specifically, the positioning roller 1204 is laterally mounted on the side of the positioning claw 1203 via a rotating shaft. The proximal end of each positioning claw 1203 is rotatably connected to the outer adjusting ring via a rotating shaft 12031 and connected to the inner adjusting ring 1202 via a driving member. Under the rotation of the inner adjusting ring 1202, each positioning roller 1204 is driven to move away from / closer to the axis of the outer adjusting ring. The inner adjusting ring 1202 is provided with a second locking member for locking the rotation angle of the inner adjusting ring 1202.

[0031] The outer fixing ring 1201 has a rotating groove on its outer side, and the inner adjusting ring 1202 is located in the rotating groove. The inner adjusting ring 1202 has a toggle block 12021 formed on it, which can drive the inner adjusting ring 1202 to rotate coaxially within the rotating groove. Specifically, as shown... Figure 5 and Figure 6 As shown, the locking component is a locking bolt 1205. The inner adjusting ring 1202 has a threaded hole. After the locking bolt 1205 is connected to the threaded hole, it is pressed against the inner wall of the rotating groove to lock the position of the inner adjusting ring 1202 after rotation.

[0032] like Figure 5 As shown, the inner side of the outer fixing ring 1201 is provided with an opening groove 12011 for the positioning claw 1203 to move, as follows: Figure 6 As shown, the rotating shaft 12031 is fixed on the inner wall near the opening groove 12011. The driving component includes a driving part 12032 formed near the positioning claw 1203 and a fixed shaft 12033 fixed on the driving part 12032. The inner adjusting ring 1202 has a curved groove 12023 for the driving part 12032 to move. The curved groove 12023 has a radial sliding groove 12022 that cooperates with the fixed shaft 12033. As the inner adjusting ring rotates, the fixed shaft 12033 is displaced in the radial sliding groove 12022, thereby driving the positioning claw 1203 to rotate around the rotating shaft 12031. The positioning roller 1204 at the front of the positioning claw 1203 moves accordingly.

[0033] More preferably, the inner side of the outer fixing ring 1201 is provided with a clearance opening 12012 adapted to the positioning roller 1204, and the clearance opening 12012 is connected to the far end of the opening groove 12011. The clearance opening 12012 and the opening groove 12011 can completely accommodate the positioning claw 1203 and the positioning roller 1204, so as to ensure that there is sufficient space in the self-centering fixture 12 to remove the shaft machining part 10.

[0034] When implementing the above technical solution, the shaft processing part 10 with the front end equipped with the heart-shaped clamp 9 is placed into two self-centering fixtures 12. The inner adjusting rings 1202 on each centering fixture 12 are rotated so that the three positioning rollers 1204 in each centering fixture 12 clamp the shaft processing part 10. The locking bolts 1205 are then tightened. At this time, due to the rotation setting of the positioning rollers 1204, the rotation of the shaft processing part 10 around the axis is not affected. The slide block 11 is pushed so that the front electrode processing hole of the shaft processing part 10 is connected with the front processing ejector pin 4 (at this time, the head ejector pin seat 2 has been fixed by the set screw). The extension rod of the heart-shaped clamp 9 is placed above the lever 601. The pull rod 802 is pulled a distance and the adjusting nut 803 is tightened. The tail is moved. The tail ejector seat 3 is used to align the post-processing ejector 5 with the rear electrode machining hole of the shaft machining part 10. The tail ejector seat 3 is then fixed with a set screw. At this time, the front processing ejector 4, the rear processing ejector 5, and the shaft machining part 10 are coaxial. Loosen the adjusting nut 803 and start the continuously variable speed motor 7. The shaft machining part 10 rotates, and the electrode machining holes at both ends are ground synchronously. This improves the roundness error of the ejector hole after grinding and solves the problem of coaxial error in the machining hole. The equipment is relatively small and can be placed next to the grinding machine. After grinding, open the locking bolt 1205 and press down the pressure rod 1302. At this time, the shaft machining part 10 is released from the clamping of the front processing ejector 4 and the rear processing ejector 5. The shaft machining part 10 is then taken out and placed on the grinding machine for subsequent processing.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A center hole grinder characterized by, The system includes a slide rail body, a head ejector seat and a tail ejector seat opposite to each other at both ends of the slide rail body and slidably connected to the slide rail body via a slider, a front machining ejector seat fixed inside the head ejector seat, a rear machining ejector seat located inside the tail ejector seat and coaxially arranged with the front machining ejector seat, and a chuck for clamping the shaft machining parts. The slider is provided with a locking member for fixing the slider position. The tail ejector seat is provided with an elastic pressing assembly for driving the rear machining ejector seat to move axially. The outside of the front machining ejector seat is rotatably connected to a dial via a bearing. The dial is fixed with a lever for driving the chuck to rotate coaxially. The head ejector seat is equipped with a continuously variable motor for driving the dial to rotate.

2. A center hole grinding machine according to claim 1, wherein The elastic pressing assembly includes a sliding shaft, a pull rod, a spring, and an adjusting nut. An axial groove is provided in the tail ejector seat to slide with the sliding shaft. The post-processed ejector is fixed to the front end of the sliding shaft. The pull rod is fixed to the rear end of the sliding shaft and extends through the tail ejector seat. The pull rod has an external thread on its outer side to cooperate with the adjusting nut. A limiting plate is fixed at the through-hole of the tail ejector seat to restrict the adjusting nut from entering the transverse groove. The spring is sleeved on the pull rod in the axial groove, and its two ends abut against the pull rod and the limiting plate, respectively.

3. A center hole lapping machine as defined in claim 2 wherein, The tail ejector pin seat is provided with a quick-opening pull rod assembly. The quick-opening pull rod assembly includes an ear seat fixed on the tail ejector pin seat and a pressure rod rotatably connected to the ear seat. An outer expansion plate is fixed to the outer end of the pull rod, and a rocker plate is fixed to one end of the pressure rod, which abuts against the inner side of the outer expansion plate.

4. A center hole lapping machine according to any one of claims 1-3, wherein, The head ejector seat and the tail ejector seat are provided with a self-centering clamping assembly. The self-centering clamping assembly includes a slide block that slides in cooperation with the slide rail body and at least two self-centering clamps fixed on the slide block. The axis of the self-centering clamp is located on the coaxial axis of the pre-processed ejector and the post-processed ejector.

5. A center hole lapping machine as defined in claim 4 wherein, The self-centering fixture includes an outer fixed ring fixed on the slide, an inner adjusting ring located inside the outer fixed ring and rotating coaxially with respect to the outer fixed ring, and three positioning claws distributed circumferentially along the outer fixed ring. The distal end of each positioning claw is equipped with a positioning roller that rolls in contact with the surface of the shaft-machined part. The proximal end of each positioning claw is rotatably connected to the outer adjusting ring via a rotating shaft and connected to the inner adjusting ring via a driving member. Under the rotation of the inner adjusting ring, each positioning roller is driven to move away from / near the axis of the outer adjusting ring. The inner adjusting ring is provided with a second locking member for locking the rotation angle of the inner adjusting ring.

6. A center hole lapping machine according to claim 5 wherein, The outer fixing ring has a rotating groove on its outer side that mates with the inner adjusting ring, and the outer fixing ring has an opening groove on its inner side that allows the positioning claw to move. The rotating shaft is fixed on the inner wall near the opening groove. The driving component includes a driving part formed near the positioning claw and a fixed shaft fixed on the driving part. The inner adjusting ring has a curved groove that allows the driving part to move, and the curved groove has a radial sliding groove that mates with the fixed shaft.

7. A center hole lapping machine as defined in claim 6 wherein, The locking component is a locking bolt, and the inner adjusting ring has a threaded hole. After the locking bolt is connected to the threaded hole, it is pressed against the inner wall of the rotating groove.

8. A center hole grinding machine according to claim 6 wherein, The outer fixing ring has an clearance opening on its inner side that is adapted to the positioning roller, and the clearance opening is connected to the far end of the opening groove.

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