CN2778437Y

CN2778437Y - Spring pre-tightening type milling head main shaft device

Info

Publication number: CN2778437Y
Application number: CN 200420120836
Authority: CN
Inventors: 张树礼; 杨曙光; 李芳�; 李炳东; 吴长江
Original assignee: Dalian Machine-Tool Group Co Ltd
Current assignee: Dalian Huagen Machinery Co., Ltd.
Priority date: 2004-12-29
Filing date: 2004-12-29
Publication date: 2006-05-10
Anticipated expiration: 2014-12-29

Abstract

The utility model discloses a main shaft device, particularly a spring pre-tightening type milling head main shaft device which is used on a milling machine. The utility model comprises a box body [8] and a main shaft [1] positioned inside the box body [8], wherein a front bearing [5] and a back bearing [11] are supported between the box body [8] and the main shaft [1]; both ends of the box body [8] are provided with a front cover [3] and a back cover [15]; a sealing element [2] is arranged between the front cover [3] and the main shaft [1]; a sealing element [16] is arranged between the abck cover [15] and the main shaft [1]; the inside of the box body [8] and the outside of the main shaft [1] are sheathed with a bearing inner ring distance sleeve [6] and a bearing outer ring distance sleeve [7]. The utility model is characterized in that a spring [9] and a spring backing ring [10] are arranged between the end head of the bearing outer ring distance sleeve [7] and a bearing outer ring. The utility model has the advantages that the structure is simple, a cooling device and a control device thereof are omitted, and the production cost is reduced; when the main shaft is heated and becomes long in the process of operation, an outer ring supporting a bearing is driven to move with the main shaft through the spring 9 and the spring backing ring 10, the main shaft freely extends and is not bent, and the precision of the milling process is guaranteed.

Description

Spring prefastening milling head main shaft device

Technical field:

The utility model relates to the employed main shaft device of a kind of Metal Cutting Machine Tool, particularly a kind of spring prefastening milling head main shaft device that is used on the milling machine.

Background technology:

Accurate milling head is to be used for a kind of high accuracy unit head on Milling Process plane, is usually used on building-block machine and the transfer matic thereof.The main motion of milling head is usually driven by cog belt by servomotor, and feed motion is then driven by the numerical controlled machinery slide unit.Because processed plane precision is had relatively high expectations, therefore very high to the requirement of finish-milling head, except enough rigidity will be arranged, the problem on deformation of main shaft also was very important.Existing milling head main axle structure is that main shaft is positioned at casing, and is provided with the back and front supporting bearing between the casing, and adds bearing cap and seal, is with bearing inner ring spacer and outer race spacer in the outside of casing inner main axis.Main shaft flexural deformation or elongation occur inevitably owing to main shaft is heated in operation process, changed the gap of spring bearing after the elongation, machining accuracy is affected, in order to address the above problem, the employing that has the type of cooling, comprise air cooling and water-cooled, control by temperature sensor and electric control gear, effect is unsatisfactory, makes device structure complicated simultaneously, the cost height.

Summary of the invention:

The purpose of this utility model provides a kind of simple in structure, position of adjusting spring bearing with spindle deformation automatically and gap, machining accuracy height, spring prefastening milling head main shaft device that equipment cost is low.

Technical solution of the present utility model is: a kind of spring prefastening milling head main shaft device, it comprises casing 8 and is positioned at the main shaft 1 of casing 8 inboards, between casing 8 and main shaft 1, be supported with fore bearing 5 and rear bearing 11, the two ends of casing 8 are provided with protecgulum 3 and bonnet 15, be provided with seal 2 between protecgulum 3 and the main shaft 1, be provided with seal 16 between bonnet 15 and the main shaft 1, be set with bearing inner ring spacer 6 and outer race spacer 7 in casing 8 inboard main shafts 1 outside, it is characterized in that: be provided with spring 9 and spring gasket ring 10 between the termination of outer race spacer 7 and the outer race.

Described spring 9 is positioned at the spring eye of outer race spacer 7 terminations, and evenly distributes on the circumference of outer race spacer 7 terminations.

Described spring 9 is 12.

The utility model compared with prior art has advantage of simple structure, cooling device and control device thereof have been saved, reduced the production cost of complete machine, in milling process, also reduced the trouble of operation, the elongation backward because main shaft is heated during work drives to encircle also in the rear bearing 11 and moves backward, because of rear bearing 11 outer shrouds upwards are free state in the wings, so when bearing inner ring was mobile backward, its outer shroud moved under the elastic force effect simultaneously.Thereby make main shaft when being heated, only can produce length deformation backward and can not produce flexural deformation, adjusted the running clearance of bearing automatically, make main shaft have good operating condition, help the stable of cutting precision and accurately like this.

Description of drawings:

Fig. 1 is the structural representation of the utility model specific embodiment.

The tool present embodiment:

As shown in the figure: 8 is casing, is supported with main shaft 1 with fore bearing 5 and rear bearing 11 in casing 8, is fixed with protecgulum 3 on fore bearing 5 place's casings 8 and uses labyrinth 2 and sealing ring 4 sealings.Be fixed with bonnet 15 on rear bearing 11 place's casings 8, and seal with labyrinth 16 and sealing ring 12.The packing ring 13 that is enclosed within on the main shaft 1 is pressed on the interior ring of rear bearing 11, and fixes with nut 14 and main shaft 1 thread connection.Be positioned at casing 8 and be with bearing inner ring spacer 6 and outer race spacer 7 outside main shaft 1, the two ends of bearing inner ring spacer 6 lean on the interior ring of fore bearing 5 and rear bearing 11 and are used for axial location.End machining at outer race spacer 7 is porose, spring 9 is housed in the hole, the external end head of spring 9 leans on the end face of spring gasket ring 10, spring gasket ring 10 is sleeved on the main shaft 1, the another side of spring gasket ring 10 leans on the outer shroud of rear bearing 11, the other end of outer race spacer 7 leans on the outer shroud of fore bearing 5, guarantee the outer shroud and the roller Elastic Contact of forward and backward bearing by the elastic force of spring 9, and bearing the pretightning force of spring, making the roller of bearing and bearer ring be in tight contact condition all the time.Described spring 9 is 12, and circumference evenly distributes in the end of outer race spacer 7.Close close as the chamber, front and back of

labyrinth

2,16 that adopted in this structure, sealing is made up of Internal and external cycle and 3 sealing rings, inner ring is fixed on the main shaft 1, the outer ring is fixed in the seam chamber of forward and backward lid, main shaft band inner ring rotation during work, and the outer ring maintains static, and has fabulous sealing effectiveness.

Claims

1. spring prefastening milling head main shaft device, it comprises casing [8] and is positioned at the inboard main shaft [1] of casing [8], between casing [8] and main shaft [1], be supported with fore bearing [5] and rear bearing [11], the two ends of casing [8] are provided with protecgulum [3] and bonnet [15], be provided with seal [2] between protecgulum [3] and the main shaft [1], be provided with seal [16] between bonnet [15] and the main shaft [1], be set with bearing inner ring spacer [6] and outer race spacer [7] in the inboard main shaft of casing [8] [1] outside, it is characterized in that: be provided with spring [9] and spring gasket ring [10] between the termination of outer race spacer [7] and the outer race.

2. spring prefastening milling head main shaft device according to claim 1, it is characterized in that: described spring [9] is positioned at the spring eye of outer race spacer [7] termination, and evenly distributes on the circumference of outer race spacer [7] termination.

3. spring prefastening milling head main shaft device according to claim 2, it is characterized in that: described spring [9] is 12.