High-speed grinding electric spindle

Abstract

The utility model relates to the technical field of electric spindles, in particular to a high-speed grinding electric spindle. A high-speed grinding electric spindle comprises a shell, a front bearing seat and a rear bearing seat are arranged at the two ends of the shell respectively, a front bearing set and a rear bearing are arranged in the front bearing seat and the rear bearing seat respectively and used for being movably provided with a core shaft, a motor stator is arranged on the inner side of the shell, and a motor rotor is arranged on the core shaft in a sleeved mode. The front end of the mandrel is used for installing a grinding tool. According to the high-speed grinding electric spindle, the mandrel is movably installed through the front bearing set and the rear bearing, rotation of the mandrel is facilitated, the front bearing set is adopted at the front end of the spindle, the rear bearing is supported at the rear end of the spindle, and the front bearing set at the front end can bear radial force and can also bear axial force.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric spindle technical field, especially a high -speed grinding electric spindle. BACKGROUND

[0002] Grinding is a very key process in the processing process, and the performance of the grinding electric spindle determines the surface quality and grinding precision of the ground parts, and also determines the grinding efficiency, and the grinding parameters affect the service life and performance of the grinding electric spindle, in order to improve the grinding efficiency and grinding quality, the performance of the grinding spindle is very critical, not only the grinding electric spindle needs larger grinding feed, but also the grinding spindle needs higher speed, and at the same time, the spindle needs higher rigidity under the condition of higher speed, the grinding spindle on the market has mechanical grinding spindle, the spindle is driven to run through the motor belt mode, the defects are that the speed cannot be too high, the vibration is big, the noise is big, and the grinding efficiency is low, the grinding electric spindle mostly adopts precision angular contact ball bearing, and high-speed operation can be realized, but the spindle cannot bear large radial grinding force, can bear axial force, but the axial grinding force that can be borne is small, the spindle is all adopted precision angular contact ball bearing, the rigidity is low, the grinding quality cannot be guaranteed, the grinding precision is low, the grinding cannot be carried out in large cutting amount, and the grinding efficiency is low.

[0003] In view of the above defects, the designer actively researches and innovates, so as to create a high-speed grinding electric spindle, so that it has more industrial utilization value. INVENTION CONTENTS

[0004] To solve the above technical problems, the purpose of the utility model is to provide a high-speed grinding electric spindle.

[0005] The utility model discloses a high-speed grinding electric spindle, including the shell, two ends of the shell are front bearing seat and rear bearing seat respectively, and the front bearing seat and rear bearing seat are respectively passed through front bearing group and rear bearing in, and the front bearing group and rear bearing are used for the movable installation of mandrel, and the motor stator is installed in the shell inner side, the motor rotor is set up on the mandrel, and the front end of the mandrel is used for installing the grinding tool.

[0006] The high-speed grinding electric spindle, the mandrel is movably installed through the front bearing group and the rear bearing, the mandrel is convenient for rotating, the front end of the spindle adopts the front bearing group, the rear end support is a rear bearing, and the front bearing group of the front end can bear the radial force and the axial force.

[0007] Further, the front end of the mandrel is pressed against the front end cover through the front locking nut, the inner side annular protrusion of the front end cover is pressed against the outer ring of the outer side bearing of the front bearing group, the lower end of the front locking nut is pressed against the inner ring of the outer side bearing of the front bearing group, and the front baffle is fixed on the front end cover.

[0008] The front end of the mandrel is pressed against the front end cover by the front locking nut, the front end cover is press-fitted with the locking nut, and the front end of the mandrel is locked.

[0009] Further, the tail end of the mandrel is fixed with a pull rod cover, a movable pull rod fixed in the tail end of the mandrel passes through the pull rod cover, the tail end of the pull rod is fixed with a disc-shaped tool releasing ring, an oil cylinder seat is fixed outside the rear bearing seat, a retractable piston is installed in the oil cylinder seat, the piston can contact the pull rod, the front end of the pull rod extends to the front end of the mandrel, and a tool locker matched with the front end of the pull rod is installed in the space of the front end of the mandrel.

[0010] The piston can contact the tool releasing ring at the tail end of the pull rod, and is used for loosening or locking the tool installed at the front end of the mandrel, facilitating the maintenance and replacement of the tool.

[0011] Further, the front bearing set includes three groups of precision angular contact ball bearings, the two precision angular contact ball bearings on the outside are arranged in series, and the precision angular contact ball bearing in the middle and the precision angular contact ball bearing at the rear end are installed in a back-to-back manner.

[0012] The front bearing set is composed of three groups of precision angular contact ball bearings, which can provide the front end of the mandrel with the ability to bear both radial force and axial force, and the rigidity is obviously improved under the premise that the speed meets the demand.

[0013] Further, the front bearing set has an inner spacer ring attached to the mandrel between the second and third precision angular contact ball bearings and an outer spacer ring attached to the inner side of the front bearing seat.

[0014] The inner spacer ring and the outer spacer ring in the front bearing set are used to separate the second and third precision angular contact ball bearings, facilitating the assembly of the precision angular contact ball bearings.

[0015] By the above scheme, the high-speed grinding electric spindle has at least the following advantages: the front end of the spindle adopts three angular contact precision bearings, and the rear end support is a single-row short cylindrical roller bearing, the front end angular contact precision bearing can bear both radial force and axial force, compared with the configuration of the traditional grinding electric spindle with one angular contact precision bearing at the front end, the rigidity is obviously improved under the premise that the speed meets the demand, the rear end adopts a single-row short cylindrical roller bearing which can bear large radial force and does not bear axial force, in the case of mandrel thermal elongation caused by spindle heating, the mandrel can extend to the rear end of the spindle, and the influence of thermal elongation on the precision of the front end of the spindle can be avoided. The above bearing configuration can enable the spindle to bear larger grinding force. Due to the high rigidity of the spindle, the torque of the spindle is large. Larger feed amount can be achieved, which not only improves the surface quality and surface precision of the ground parts, but also improves the grinding efficiency.

[0016] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, the following is the preferred embodiment of the present application and the detailed description of the drawings as follows. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the present application, the following will be briefly introduced to the drawings needed in the embodiment, it should be understood that the following drawings only show a certain embodiment of the present application, therefore should not be regarded as a limitation, for those skilled in the art, without creative labor, can also obtain other related drawings according to these drawings.

[0018] Figure 1 is a structural schematic diagram of the present application;

[0019] In the figure 1, the shell, 2, the front bearing seat, 3, the rear bearing seat, 4, the front bearing group, 5, the rear bearing, 6, the mandrel, 7, the motor stator, 8, the motor rotor, 9, the front locking nut, 10, the front end cover, 11, the front baffle, 12, the pull rod gland, 13, the pull rod, 14, the knife ring, 15, the oil cylinder seat, 16, the piston, 17, the inner spacer ring, 18, the outer spacer ring. DETAILED DESCRIPTION

[0020] The specific implementation of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0021] Referring to Figure 1 , the shell 1 of the high-speed grinding electric spindle and the mandrel 6 are movably mounted through the front bearing group 4 and the rear bearing 5 installed in the front bearing seat 2 and the rear bearing seat 3, respectively, to provide rotary support for the front and rear ends of the mandrel 6, and the motor stator 7 in the shell 1 and the electronic rotor 8 sleeved on the mandrel 6 facilitate the rotation of the mandrel 6.

[0022] The locking nut 9 screwed into the front end of the mandrel 6 is pressed against the front end cover 10 on the outside, which can drive the front end cover 10 to move inward, and the protrusions on the inside of the locking nut 9 and the front end cover 10 are pressed against the inner and outer rings of the bearings on the outside of the front bearing group 4, respectively, to complete the pressing and locking operation of the bearings, and the front end cover 10 installed on the front baffle 11 can play the role of dustproof end.

[0023] The pull rod 13 is arranged in the core shaft 6, the piston 16 in the oil cylinder seat 15 arranged on the outer side of the rear bearing seat 3 can move forward and backward, the piston 16 can be pressed on the tool knocking ring 14 after moving forward, the pull rod 13 can be moved forward, the pull rod 13 can push the tool locking device to the wide end of the core shaft 6, and the tool can be taken down, the tool locking device is in a plurality of petal structures, cooperates with the tapered space at the front end of the core shaft 6, and in the tension state, the petal structure is compressed by the tapered space at the front end of the core shaft 6, so that the tool can be locked, the spring is arranged on the pull rod 13, the tail end of the spring is in contact with the bottom of the space in the core shaft 6, the other end is in contact with the protrusion at the tail end of the pull rod 13, the pull rod 13 is continuously provided with a backward thrust, and the tool is locked.

[0024] The inner spacer ring 17 and the outer spacer ring 18 are arranged between the second and third precision angular contact ball bearings of the front bearing set 4, and are used for separating the second and third precision angular contact ball bearings.

[0025] The working principle of the utility model is as follows:

[0026] The first precision angular contact ball bearing and the second precision angular contact ball bearing are arranged in series and back-to-back with the third precision angular contact ball bearing, are installed in the front bearing seat 4, support the front end of the core shaft 6, the front end cover 10 is used for pressing the outer ring of the front end precision angular contact ball bearing, the inner ring is pressed by the front locking nut 9, the front baffle 11 is fixed on the front end cover 10, and the front locking nut 9 is formed in small gap cooperation, so that dust and impurities in the outside are prevented from entering the inside of the main shaft. The motor rotor 8 is in interference fit with the core shaft 6, the motor stator 7 is matched with the shell 1, the single-row cylindrical roller bearing is installed in the rear bearing 5 in the rear bearing seat 3, the pull rod 13 has the tool knocking ring 14 at the rear end, and the piston 16 and the oil cylinder seat 15 form the tool knocking oil cylinder. The loosening and tool knocking action of the main shaft is completed.

[0027] Finally, it should be pointed out that: first, in the description of the present application, it should be pointed out that, unless otherwise specified and limited, the terms "installation", "connection", "connection" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to represent the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0028] Secondly: the utility model discloses the embodiment in the drawing, only relates to the structure involved in the embodiment of the present disclosure, other structures can refer to the usual design, in the case of no conflict, the same embodiment and different embodiments of the utility model can be combined with each other;

[0029] Finally: the above described is only the preferred embodiment of the present application, and is not used to limit the present application, it should be pointed out that, for ordinary skilled in the art, without departing from the technical principle of the present application, can make a number of improvements and variations, these improvements and variations should also be considered as the protection scope of the present application.

Claims

1. A high speed grinding electrospindle comprising a housing (1), characterized in that: The outer shell (1) has a front bearing seat (2) and a rear bearing seat (3) at two ends, respectively, and the front bearing seat (2) and the rear bearing seat (3) are provided with a front bearing set (4) and a rear bearing (5) respectively, the front bearing set (4) and the rear bearing (5) are used for movably mounting a mandrel (6), a motor stator (7) is mounted on the inner side of the outer shell (1), a motor rotor (8) is sleeved on the mandrel (6), and the front end of the mandrel (6) is used for mounting a grinding tool.

2. A high speed grinding electrospindle according to claim 1, characterized in that: The front end of the mandrel (6) is pressed against a front end cover (10) through a front locking nut (9), the inner side of the front end cover (10) is annularly protruded and pressed against the outer ring of the outer bearing of the front bearing set (4), the lower end of the front locking nut (9) is pressed against the inner ring of the outer bearing of the front bearing set (4), and a front baffle (11) is fixed on the front end cover (10).

3. A high speed grinding electrospindle according to claim 2, characterized in that: The tail end of the mandrel (6) is fixed with a pull rod pressing cover (12), a movable pull rod (13) fixed in the tail end of the mandrel (6) passes through the pull rod pressing cover (12), the tail end of the pull rod (13) is fixed with a disc-shaped tool knocking ring (14), an oil cylinder seat (15) is fixed outside the rear bearing seat (3), a telescopic piston (16) is installed in the oil cylinder seat (15), the piston (16) can contact the pull rod (13), the front end of the pull rod (13) extends to the front end of the mandrel (6), and a tool locking device matched with the front end of the pull rod (13) is installed in the space at the front end of the mandrel (6).

4. A high speed grinding electrospindle according to claim 3, characterized in that: The front bearing set (4) comprises three sets of precision angular contact ball bearings, the outer two precision angular contact ball bearings are arranged in series, and the middle precision angular contact ball bearing and the rear precision angular contact ball bearing are installed in a back-to-back manner.

5. A high speed grinding electrospindle according to claim 4, characterized in that: The front bearing set (4) is located between the second and third precision angular contact ball bearings and has an inner spacer ring (17) attached to the mandrel (6) and an outer spacer ring (18) attached to the inner side of the front bearing seat (2).

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