Milling cutter arbor connecting structure and lathe

Abstract

The utility model discloses a milling cutter arbor connecting structure and lathe relates to machining technical field, the milling cutter arbor connecting structure includes milling cutter arbor, also includes caudal cone sleeve, the near end of caudal cone sleeve is provided with the opening part that the milling cutter arbor is inserted into, and the far end side in the opening part is provided with the limit groove, the limit groove is provided with the first bearing, and the first bearing is provided with the second bearing. The opening part is provided with a second bearing; and the far end of the milling cutter rod extends into the opening part and is respectively connected with the first bearing and the second bearing. According to the utility model, the conventional tailstock tip in the prior art is canceled, and the tail taper sleeve assembly structure which is larger and more stable in stress and consists of the single-row radial ball bearing and the plane thrust bearing is adopted for supporting and fixing the milling cutter rod, so that the dimensional accuracy, the roughness and the like of parts can be effectively ensured; the technical problems of large jumping and shaking, low strength and poor reliability of the milling cutter bar in the prior art are thoroughly solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical processing technical field, specifically to a milling cutter bar connecting structure and lathe. BACKGROUND

[0002] In the machining industry, milling inner and outer open L is a processing mode often encountered, such as automobile front steering knuckle, front axle and other parts are the most common parts that need to be processed open L. For such parts, the current processing mode is mostly processed on the horizontal milling machine, because the horizontal milling machine is a special equipment, many small processing plants do not have horizontal milling machine, so when the part quantity is small or the new product sample is trial-produced, it is mostly processed on the ordinary lathe. When using ordinary lathe, the following problems exist:

[0003] (1) Because the inner hole of the milling cutter head is generally a standard size, the inner hole of the milling cutter head cannot be made very large, resulting in that the diameter of the milling cutter bar cannot be thickened, which leads to poor rigidity of the milling cutter bar and easy bending deformation;

[0004] (2) When the milling cutter bar works, its outer end is clamped by the tailstock center installed in the tailstock, the tailstock center is clamped in the center hole of the milling cutter bar, the contact area of the tailstock center is small, and the tailstock center is worn out quickly, which causes the open size L of the final processing to be unable to meet the size requirement of the drawing;

[0005] (3) Because the tailstock center is clamped in the center hole of the milling cutter bar, the contact area is small, the force is small, the mandrel shakes and jumps greatly when working, the impact load capacity is poor, it is difficult to keep balance, and the size L has poor precision;

[0006] (4) The assembly composed of the milling cutter bar and the milling cutter head has poor stability, large jumping, low strength, and finally causes the roughness of the two sides of the milling cut open L to be poor, not parallel, and unable to meet the technical standard requirement;

[0007] (5) When the impact load is too large occasionally, the tailstock center and the center hole of the milling cutter bar may be separated, and the safety accidents of bending or flying out of the milling cutter bar and the milling cutter head assembly during high-speed rotation processing are prone to occur. INVENTION CONTENTS

[0008] In view of the defects in the prior art, the purpose of the utility model is to provide a milling cutter bar connecting structure and lathe, which cancels the tailstock center commonly used in the prior art, adopts the tail cone sleeve assembly structure composed of single row angular contact ball bearing and plane thrust bearing with larger and more stable stress to support and fix the milling cutter bar, the size precision and roughness of the part can be effectively guaranteed, and the technical problems of large jumping and shaking of the milling cutter bar, low strength and poor reliability in the prior art are completely solved.

[0009] In order to achieve the above object, the technical scheme adopted by the utility model is: a milling cutter bar connecting structure, including milling cutter bar, still including cauda equina cover, the proximal end of cauda equina cover is provided with the opening part for the insertion of milling cutter bar, and the distal end side in the opening part is provided with the limiting groove, the limiting groove is provided with the first bearing, the opening part is provided with the second bearing;The distal end of the milling cutter bar extends into the opening part and is connected with the first bearing and the second bearing respectively.

[0010] Further improvement lies in that: the first bearing is a plane thrust bearing, and the second bearing is a single-row radial ball bearing.

[0011] Further improvement lies in that: the first bearing is provided with two, and the bearing spacer sleeve is arranged between the two first bearings;The distal end of the first bearing is in contact with the second bearing, and the proximal end of the first bearing is provided with an oil seal outside.

[0012] Further improvement lies in that: still including tail seat, the distal end of cauda equina cover is provided with a tapered portion, the tapered portion is inserted into the proximal end side of tail seat, and a through channel is arranged in the tapered portion, the proximal end of the channel is communicated with the opening part, and the distal end of the channel is provided with a positioning hole;The distal end side of the tail seat is provided with a tension bolt, the screw rod of the tension bolt is inserted into the tail seat and connected with the positioning hole, and the tension washer and the spring washer are arranged between the nut of the tension bolt and the tail seat.

[0013] Further improvement lies in that: still including milling cutter head, the milling cutter head is installed on the milling cutter bar through a flat key.

[0014] Further improvement lies in that: the milling cutter head is provided with two, and the adjusting spacer sleeve is arranged between the two milling cutter heads.

[0015] Further improvement lies in that: the proximal end of the milling cutter bar is provided with an expansion part, the expansion part is in contact with the adjacent milling cutter head, and the proximal end of the expansion part is provided with a connecting part for connecting the lathe.

[0016] Further improvement lies in that: the distal end of the milling cutter bar is sequentially provided with a first reduced diameter part and a second reduced diameter part;The first reduced diameter part is provided with a locking nut, and the locking nut is in contact with the adjacent milling cutter head through a compression pad;The second reduced diameter part is connected with the first bearing and the second bearing respectively.

[0017] The utility model also provides a lathe, which is provided with the milling cutter bar connecting structure as described above.

[0018] Further improvement lies in that: the lathe is provided with a chuck and a movable support plate;The chuck is used for connecting the proximal end of the milling cutter bar, and the movable support plate is provided with a clamp for positioning a workpiece.

[0019] The utility model has the advantages of:

[0020] 1. The utility model discloses, in order to improve the rigidity of milling arbor rotation processing, reduce the elastic deformation, cancel the traditional tail center, adopt the new design's tail cone cover combination structure, effectively improve the rigidity and strength after stress, and the stability is better.

[0021] 2. The utility model discloses, in order to guarantee the radial force of milling arbor when bearing rotary milling, the outer end of milling arbor is equipped with two single row angular ball bearings, compared with the point contact of the center, this structure can effectively increase the stress area, guarantee can bear enough radial force, and rotate nimble, small movement resistance.

[0022] 3. The utility model discloses, in order to guarantee the spacing of two single row angular ball bearings, bearing spacer sleeve of spacing adjustment is installed on two single row angular ball bearings, stress balance can effectively reduce the swing of milling arbor, and it is more stable after stress.

[0023] 4. The utility model discloses, because milling arbor when rotary milling, also want to bear the axial force of tail cone cover pressure tight milling arbor, therefore the outer end of milling arbor is equipped with plane thrust bearing, plane thrust bearing inner hole is installed on milling arbor, and outer circle is installed on tail cone cover inner hole, can bear enough axial force, can effectively prevent the outer end surface of milling arbor and tail cone cover inner hole end surface contact, avoid causing milling arbor dead and cannot complete rotary processing.

[0024] 5. The utility model discloses, in order to guarantee milling arbor when rotary milling, nimble, the clearance between two single row angular ball bearings and bearing roller gap are all injected with lubricating grease, in order to prevent lubricating grease leakage and overflow and pollute the environment, oil seal is equipped on the outside of single row angular ball bearing, can effectively avoid leakage and heat, prolong the service life of tooling.

[0025] 6. The utility model discloses, because milling processing has vibration of different degrees, in order to prevent the loose between tail cone cover and tailstock cooperation surface, adopts the tight washer, spring washer and tight bolt to tighten and fix tail cone cover and tailstock, can effectively prevent the swing, loose and bounce of milling arbor, improve the processing accuracy.

[0026] 7. The utility model discloses, because milling cutter inner hole all have keyway, therefore milling cutter and milling arbor are connected through flat key, and the assembly is quick and convenient, firm and reliable, simple and easy to carry out. DRAWINGS

[0027] Figure 1 It is the structure schematic view of milling arbor connecting structure in the utility model embodiment;

[0028] Figure 2 It is the connection schematic view of tail cone cover and milling arbor in the utility model embodiment;

[0029] Figure 3 It is the structure schematic view of tail cone cover in the utility model embodiment.

[0030] Figure 4 Structure diagram of the milling cutter bar in the embodiment of the present application;

[0031] Figure 5 Connection diagram of the tail cone sleeve and the tail seat in the embodiment of the present application;

[0032] Figure 6 Connection diagram of the milling cutter bar and the milling cutter disc in the embodiment of the present application;

[0033] Figure 7 Structure diagram of the lathe in the embodiment of the present application;

[0034] Figure 8 Working principle diagram of the lathe in the embodiment of the present application.

[0035] Reference signs:

[0036] 1 - tail cone sleeve; 11 - opening part; 12 - limiting groove; 13 - conical part; 14 - channel; 15 - positioning hole; 16 - first bearing; 17 - second bearing; 18 - bearing spacer sleeve; 19 - oil seal;

[0037] 2 - milling cutter bar; 21 - flat key; 22 - expansion part; 23 - connecting part; 24 - first reduced diameter part; 25 - second reduced diameter part;

[0038] 3 - tail seat; 31 - tension bolt; 32 - tension gasket; 33 - spring washer;

[0039] 4 - milling cutter disc; 41 - adjusting spacer sleeve; 42 - compression gasket; 43 - locking nut;

[0040] 5 - lathe; 51 - chuck; 52 - moving support plate; 53 - clamp. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described in detail below, and the embodiment examples are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout.

[0042] In the description of the utility model, it is necessary to explain that, for the direction words, if the terms "center", "transverse (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the utility model.

[0043] In addition, if the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the "first", "second" features can be explicitly or implicitly included one or more features, and in the description of the utility model, the meaning of "several", "several" is two or more than two, unless otherwise explicitly specified.

[0044] The specific embodiments of the utility model are further described below in conjunction with the drawings of the specification, so that the technical scheme of the utility model and its beneficial effects are clearer and more explicit. The description of the embodiments below is exemplary and is intended to explain the utility model, and cannot be understood as limiting the utility model.

[0045] Referring to Figure 1 and Figure 2 , the utility model embodiment provides a milling cutter bar connecting structure, including milling cutter bar 2, still including tail vertebra cover 1, the proximal end of tail vertebra cover 1 is provided with the opening part 11 for the insertion of milling cutter bar 2, and the distal end side in opening part 11 is provided with limit slot 12, limit slot 12 is provided with first bearing 16, and opening part 11 is provided with second bearing 17;The distal end of milling cutter bar 2 extends into opening part 11 and is connected with first bearing 16 and second bearing 17 respectively. Specifically, first bearing 16 is plane thrust bearing, and second bearing 17 is single row centripetal ball bearing. Two first bearings 16 are arranged, and bearing spacer 18 is arranged between the two first bearings 16;The distal end first bearing 16 abuts second bearing 17, and the outer side of the proximal end first bearing 16 is provided with oil seal 19. In order to ensure that the milling cutter bar is flexible when rotating milling, the gap between the two single row centripetal ball bearings and the bearing roller gap are filled with lubricating grease, the lubrication function is improved, the resistance during operation can be effectively reduced, and the operation mechanism is prevented from heating.

[0046] Referring to Figure 1 , Figure 3 and Figure 5As shown, the milling cutter shank connection structure also includes a tailstock 3. A tapered portion 13 is provided at the distal end of the tailstock sleeve 1. This tapered portion 13 is inserted into the proximal side of the tailstock 3, and a through channel 14 is provided inside the tapered portion 13. The proximal end of the channel 14 communicates with the opening 11, and the distal end of the channel 14 is provided with a positioning hole 15. A tensioning bolt 31 is provided at the distal end of the tailstock 3. The thread of the tensioning bolt 31 is inserted into the tailstock 3 and connected to the positioning hole 15. A tensioning washer 32 and a spring washer 33 are provided between the nut of the tensioning bolt 31 and the tailstock 3. To prevent grease applied to the gap between the two single-row radial ball bearings and the bearing roller clearance from overflowing from the threaded hole at the tail end of the tailstock sleeve, sealant is evenly applied to the outer circumference of the thread when installing the tensioning bolt, which can effectively improve the sealing function between the tensioning bolt and the threaded connection of the tailstock sleeve.

[0047] See Figure 1 , Figure 4 and Figure 6 As shown, the milling cutter shank connection structure also includes a milling cutter disc 4, which is mounted on the milling cutter shank 2 via a flat key 21. Specifically, there are two milling cutter discs 4, and an adjusting spacer 41 is provided between the two milling cutter discs 4. An expansion portion 22 is provided at the proximal end of the milling cutter shank 2, which abuts against the adjacent milling cutter disc 4, and a connecting portion 23 for connecting to the lathe 5 is provided at the proximal end of the expansion portion 22. A first diameter reduction portion 24 and a second diameter reduction portion 25 are provided sequentially at the distal end of the milling cutter shank 2; a locking nut 43 is provided at the first diameter reduction portion 24, which abuts against the adjacent milling cutter disc 4 via a clamping washer 42; the second diameter reduction portion 25 is connected to the first bearing 16 and the second bearing 17 respectively.

[0048] See Figure 7 and Figure 8 As shown, this embodiment of the present invention also provides a lathe, which is equipped with the milling cutter shank connection structure as described above. Specifically, the lathe 5 is equipped with a chuck 51 and a movable support plate 52; the chuck 51 is used to connect the proximal end of the milling cutter shank 2, and the movable support plate 52 is equipped with a fixture 53 for positioning the workpiece.

[0049] The working principle of this utility model is as follows:

[0050] (1) The fixture is fixed to the lathe moving plate by bolts, and the workpiece is fixed to the fixture by bolts. As the moving plate moves at a certain speed, the tool is fed in, and the workpiece opening size L is processed.

[0051] (2) The near end of the milling cutter bar is clamped in the lathe chuck, and the far end is installed in the tail cone sleeve through a single-row radial ball bearing and a flat thrust bearing. The tail cone sleeve is installed in the taper hole inside the tailstock. The tailstock is moved to a suitable position on the lathe bed and then locked and fixed.

[0052] (3) Two single-row radial ball bearings are installed at the far end of the milling cutter shank to support the milling cutter shank and bear radial force. A bearing spacer is installed between the two single-row radial ball bearings to adjust the distance between the two bearings and ensure the size of the milling gap L; since the milling cutter shank also has to bear the axial force of the tail cone sleeve pressing the milling cutter shank, a flat thrust bearing is installed at the far end of the milling cutter shank, which can bear the axial force and realize the rotational motion;

[0053] (4) The assembly consisting of the milling cutter bar, two single-row radial ball bearings, bearing spacers, and a planar thrust bearing is installed as a whole into the tail cone sleeve. The outer diameter of the tail cone sleeve is machined into a Morse taper of No. 5, which matches the taper of the inner hole of the tailstock and is assembled to withstand the radial force when the milling cutter bar rotates;

[0054] (5) The milling cutter disc is mounted on the milling cutter rod by a flat key. An adjustment spacer is installed between the two milling cutter discs. The appropriate width of the adjustment spacer is selected according to the required opening size L of the workpiece to be processed. The milling cutter disc is positioned by the step of the milling cutter rod. The milling cutter disc is locked on the milling cutter rod by the clamping shim and the locking nut.

[0055] (6) After the tail cone sleeve is inserted into the tailstock cone hole, it is tightened by the tensioning washer, spring washer and tensioning bolt installed on the outside of the tailstock to prevent the tail cone sleeve from loosening;

[0056] (7) When milling the workpiece opening size L, the lathe spindle drives the milling cutter head to rotate, and the moving pallet drives the fixture and workpiece mounted on it to move at an appropriate speed, so as to realize the machining of the workpiece opening size L.

[0057] In the description of this specification, references to terms such as "an embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. Illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions based on this utility model using techniques known in the art all fall within the protection scope of this utility model and should be defined by the claims.

Claims

1. A milling cutter shank connection structure, comprising a milling cutter shank (2), characterized in that: It also includes a tail cuff (1), the proximal end of which is provided with an opening (11) for inserting a milling cutter rod (2), and the distal end of the opening (11) is provided with a limiting groove (12), the limiting groove (12) is provided with a first bearing (16), and the opening (11) is provided with a second bearing (17); the distal end of the milling cutter rod (2) extends into the opening (11) and is connected to the first bearing (16) and the second bearing (17) respectively.

2. The milling cutter shank connection structure according to claim 1, characterized in that: The first bearing (16) is a planar thrust bearing, and the second bearing (17) is a single-row radial ball bearing.

3. The milling cutter shank connection structure according to claim 1, characterized in that: There are two first bearings (16), and a bearing spacer (18) is provided between the two first bearings (16); the first bearing (16) located at the far end abuts against the second bearing (17), and an oil seal (19) is provided on the outside of the first bearing (16) located at the near end.

4. The milling cutter shank connection structure according to claim 1, characterized in that: It also includes a tailstock (3), and the distal end of the tailstock sleeve (1) is provided with a conical part (13), which is inserted into the proximal side of the tailstock (3), and the conical part (13) is provided with a through channel (14), the proximal end of the channel (14) is connected to the opening (11), and the distal end of the channel (14) is provided with a positioning hole (15); the distal side of the tailstock (3) is provided with a tensioning bolt (31), the screw of the tensioning bolt (31) is inserted into the tailstock (3) and connected to the positioning hole (15), and a tensioning washer (32) and a spring washer (33) are provided between the nut of the tensioning bolt (31) and the tailstock (3).

5. The milling cutter shank connection structure according to claim 1, characterized in that: It also includes a milling cutter disc (4), which is mounted on the milling cutter bar (2) by a flat key (21).

6. The milling cutter shank connection structure according to claim 5, characterized in that: There are two milling cutter discs (4), and an adjustment spacer (41) is provided between the two milling cutter discs (4).

7. The milling cutter shank connection structure according to claim 5, characterized in that: The milling cutter bar (2) has an expansion portion (22) at its proximal end, which abuts against the adjacent milling cutter disc (4), and the proximal end of the expansion portion (22) has a connecting portion (23) for connecting to the lathe (5).

8. The milling cutter shank connection structure according to claim 5, characterized in that: The distal end of the milling cutter bar (2) is provided with a first reduced diameter section (24) and a second reduced diameter section (25) in sequence; the first reduced diameter section (24) is provided with a locking nut (43), which is held against the adjacent milling cutter disc (4) by a pressure washer (42); the second reduced diameter section (25) is connected to the first bearing (16) and the second bearing (17) respectively.

9. A lathe, characterized in that: The lathe (5) is provided with a milling cutter bar connection structure as described in any one of claims 1 to 8.

10. The lathe according to claim 9, characterized in that: The lathe (5) is provided with a chuck (51) and a movable tray (52); the chuck (51) is used to connect the near end of the milling cutter bar (2), and the movable tray (52) is provided with a fixture (53) for positioning the workpiece.

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