CN104100689A

CN104100689A - Manufacturing method of ball screw

Info

Publication number: CN104100689A
Application number: CN201310115738.8A
Authority: CN
Inventors: 李进胜; 杨进财
Original assignee: TBI MOTION TECHNOLOGY Co Ltd
Current assignee: TBI MOTION TECHNOLOGY Co Ltd
Priority date: 2013-04-03
Filing date: 2013-04-03
Publication date: 2014-10-15
Anticipated expiration: 2033-04-03
Also published as: CN104100689B

Abstract

The invention relates to a manufacturing method of a ball screw. The manufacturing method comprises the following steps: forming at least one assembling opening in a screw cap body, wherein the assembling opening extends in the direction from one end face of the screw cap body to the other end face of the screw cap body and runs through the outer surface and the inner surface of the screw cap body; assembling a return channel to the assembling opening; enabling the screw cap body to sleeve a screw so as to form a ball passage among the screw cap body, the return channel and the screw; accommodating a plurality of balls in the ball passage. Through the manufacturing method disclosed by the invention, the manufacturing method has the advantages of reducing the processing difficulty of the ball screw, reducing the manufacturing cost and strengthening the precision that the return channel is positioned and assembled on the screw cap body.

Description

The manufacture method of ball screw

[technical field]

The present invention system is about a kind of manufacture method of ball screw.

[background technique]

Ball screw is a kind of device being widely used in many machinery, and the object of its setting is the transmission agency that provides accurate, by rotatablely moving and straight line motion in mechanically actuated, and then makes board or the object of carrying in rectilinear direction, carry out start.

The ball screw of being applied is at present mainly to comprise a screw rod, a nut, plural ball, screw surface cording has spiral groove, within nut, surface also has spiral internal channel, between energy and screw rod, form a ball channel, ball is placed in wherein, and form the relation of relative rolling with screw rod, nut, to reduce the frictional force relatively rotating between screw rod and nut.And wherein, ball moves to the other end by one end of ball channel, that is moved to after the other end by one end of nut, must see through a return channel, be back to the starting point of ball channel, could continue thus to roll in ball channel.

The form of return channel has a variety of, but on the whole it is to be all arranged on the outer surface of nut body, or is arranged at the end caps of nut body.No matter be so above-mentioned which kind of setting position, in known techniques, in order to form the groove of accommodating return channel, but nut body must be through the complicated procedure that has height-precision requirement.But in nut body course of working, for forming groove, often cause the thick degree of meat to reduce, therefore after heat treatment, often increase compared with thin its heat distortion amount that makes because meat is thick, and more have easily cracked problem.Even make the distortion of groove part structure generation, and then cause return channel assembling to be difficult for, the ball groove in return channel cannot positively be mated with ball channel, and have influence on further the smooth degree of the shuttling movement of ball.

In brief, the past is in order to maintain machining accuracy, but do not wish to occur above-mentioned problem, and its result promotes processing difficulties degree and cost exactly.In addition the unmanageable problem of return channel positioning precision that, still has processing rear groove to provide.

Therefore, how a kind of manufacture method of ball screw is provided, system can be under the basis of the procedure of simplification, reduce processing degree of difficulty and manufacture cost, and strengthen locating effect and the assembly precision of return channel on nut body, form the complete ball channel without section difference, single unit system can carry out stable start when guaranteeing to apply, has become one of important topic.

[summary of the invention]

Because above-mentioned problem, the present invention's object is for providing a kind of manufacture method of ball screw, system can be under the basis of the procedure of simplification, reduce processing degree of difficulty and manufacture cost, and strengthen locating effect and the assembly precision of return channel on nut body, form the complete ball channel without section difference, single unit system can carry out stable start when guaranteeing to apply.

For reaching above-mentioned purpose, according to the manufacture method of a kind of ball screw of the present invention, comprise the following steps: on a nut body, form at least one assembling opening, wherein assemble the extension of the direction to other end from one of nut body end face of opening system, and connect surface and internal surface outside nut body; Assemble a return channel to assembling opening; Sheathed nut body is in a screw rod, to form a ball channel between nut body, return channel and screw rod; And accommodating plural ball is in ball channel.

In one embodiment, assembling opening system forms in the mode of turnning and milling or cutting process.

In one embodiment, on nut body, after formation assembling opening, more comprise the following steps: grind wall within assembling opening.

In one embodiment, before the step of assembling return channel, more comprise the following steps: combination two reflux assemblies form return channel, and two reflux assemblies have respectively a card access surface and with respect to one of card access surface installation surface, return channel system contacts with nut body with two installation surfaces.

In one embodiment, one of them has a trip in card access surface two reflux assemblies, and wherein another has an engagement portion in card access surface, and two reflux assemblies see through trip and engagement portion and mutually engage and form return channel.

In one embodiment, after forming return channel, combination two reflux assemblies more comprise the following steps: form a leak stoppage structure.Wherein two reflux assemblies one of them there is a protuberance in card access surface, wherein another has a slot part in card access surface, and protuberance and the slot part common leak stoppage structure that forms in the time that two reflux assemblies engage mutually.

In one embodiment, reflux assembly has respectively two protuberances in the dual side-edge of card access surface, and another reflux assembly has respectively two slot parts in the dual side-edge of card access surface.

In one embodiment, nut body has two groups and connects inclined-plane in two sides of assembling opening, and two groups of extensions that connect inclined-plane have an angle of cut, and return channel system connects inclined-plane with two installation surfaces and nut body two groups and contacts.

In one embodiment, the angle of angle of cut system is between 1～170 degree.

In one embodiment, two groups connect the direction of extension system axle among nut body on inclined-plane.

In one embodiment, two groups meet the extension system on inclined-plane away from the direction of axle among nut body.

In one embodiment, manufacture method more comprises the following steps: assembling one dust preventing component is to assembling opening.Dust preventing component has a positioning part, and positioning part system is fixed in assembling opening.

From the above, according to the manufacture method of the present invention's ball screw, be to see through on nut body, to form the assembling opening that connects surface and internal surface outside nut body, for return channel setting.Specifically, assembling opening not only connects this inside and outside of nut, and be that the direction to other end is extended from one of nut body end face, therefore assemble opening and present an open hatch frame with respect to nut body, be applicable to making by open processing method.And open processing method, such as turnning and millings etc., are relatively easy, and are easy to the manufacturing process of QC.

Compared to the known groove structure that only forms non-penetrating formula outside nut body on surface or end face, the present invention considers without extra whether the meat of nut body is thick enough, and nothing is because cause meat thickness through processing, after after heat treatment, easily produce the large and easy cracked problem of heat distortion amount.Moreover the present invention's processing method is also difficult for producing distortion at assembling opening, affects follow-up assembly precision.

Generally speaking, the present invention's manufacture method can see through easy procedure for processing and complete, and not only significantly reduces the difficulty of processing and expends time in, the accuracy of manufacturing that more can improve further and yield, the stability when promoting ball screw overall operation.

[brief description of the drawings]

Fig. 1 is the flow chart of steps according to the manufacture method of the ball screw of one embodiment of the invention.

Fig. 2 A is the schematic appearance that the step shown in Fig. 1 machines the ball screw of gained.

Fig. 2 B is the decomposing schematic representation of the ball screw shown in Fig. 2 A.

Fig. 2 C is the perspective view of the return channel of the ball screw shown in Fig. 2 A.

Fig. 2 D is the combination schematic diagram of the return channel of the ball screw shown in Fig. 2 C.

Fig. 2 E is that the ball screw shown in Fig. 2 A is in the generalized section at hatching A-A place.

Fig. 3 is the generalized section according to the ball screw shown in another embodiment of the present invention.

[mode of execution]

Hereinafter with reference to correlative type, the manufacture method according to a kind of ball screw of preferred embodiment of the present invention is described, wherein identical assembly will be illustrated with identical reference marks.

Fig. 1 is the flow chart of steps according to the manufacture method of the ball screw of one embodiment of the invention, and Fig. 2 A is the schematic appearance that the step shown in Fig. 1 machines the ball screw of gained, and Fig. 2 B is the decomposing schematic representation of the ball screw shown in Fig. 2 A.Please also refer to shown in Fig. 1, Fig. 2 A and Fig. 2 B, ball screw S system is combined by multiple assemblies, and those assemblies mainly comprise a screw rod 1, a nut 2 and plural ball 3.Wherein, nut 2 is to be slidedly arranged on screw rod 1, and the common ball channel that forms between nut 2 and screw rod 1, and ball 3 is placed in ball channel.And the manufacture method of a kind of ball screw of the present embodiment, can comprise the following steps: on a nut body, form at least one assembling opening, wherein assemble the extension of the direction to other end from one of nut body end face of opening system, and connect surface and internal surface (S11) outside nut body; Assemble a return channel to assembling opening (S13); Sheathed nut body is in a screw rod, to form a ball channel (S15) between nut body, return channel and screw rod; Accommodating plural ball (S17) in ball channel.

In the time of each step explanation, referring to seeing and decomposing schematic representation outside the ball screw shown in Fig. 2 A and Fig. 2 B, in order to the technology contents of understanding the present invention.Before implementing the present invention's step S11, first process a nut body material (not shown) to form a nut body 21.Specifically, nut body material can be metal bulk or columnar material, then after abrasive machining, forms nut body 21 and thin portion structure thereof.Certainly, the processing molding method of nut body 21 is non-is restricted person, and in practical application, nut body 21 also can see through other and mode such as make as casting moulding, forging molding method, the turnning and milling method of forming and make.Nut body 21 can be a ring-type cylinder, and is formed with an interior ball grooves 211 in inner side.Certainly, in actual manufacture process, can on nut body material, be drilled with the positions, hole such as flange hole, oilhole, return port according to user demand, or even through carrying out the hardness of surface heat processing with stiffnut body in nut body material, the present invention does not also limit in this.

In the present embodiment, before step S11, nut body 21 that also can be corresponding above-mentioned, separately forms a screw rod 1, and screw rod 1 is a cylindric body of rod, and its outer surface has a corresponding interior ball grooves 211 and the helical track groove 11 along longitudinal axis continuous winding.Corresponding setting by rail slot 11 with interior ball grooves 211, in the time that nut body 21 and screw rod 1 assemble, the common formation of both meetings one ball channel.

In step S11, on nut body, form at least one assembling opening, must first illustrate especially, assembling opening system uses for a return channel setting, and its implementation detail will be described in back segment.Please refer to shown in Fig. 2 B, the present embodiment is that to form two assembling openings 212,213 be example, and two assembling openings 212,213 are the opposite side that is arranged at nut body 21.Specifically, the all extensions of the direction to other end from one of nut body 21 end face of two assembling openings 212,213, taking assembling opening 212 as example explanation, it is to extend to the direction of the second end face ES2 from the first end face ES1 of nut body 21, simultaneously, assembling opening 212 has also connected surperficial OS and internal surface IS outside nut body 21, and then presents the breach form of one " open " with respect to nut body 21.Therefore, on processing procedure, the present embodiment only must see through the mode, the particularly mode of CNC turnning and milling of lathe milling, can adopt the mode of open operation, on nut body 21, for example, from the first end face ES1 or from outer surface OS, the former is to the second end face ES2, and the latter is to internal surface IS, directly eliminate the block of preliminary dimension, and form assembling opening 212.In practical application, assembling opening also can be via turning or cutting process moulding.In addition, nut body 21 defines that the limit wall of assembling opening 212 is follow-up more can be seen through and grind and/or the mode processing such as polishing, and remaining burr after thick moulding are removed, and help reduction tolerance, and the present invention does not limit in this.Again, above-mentioned other undeclared operative section should be persond having ordinary knowledge in the technical field of the present invention can the person of understanding, repeats no more in this.

In addition, be worth special instruction, run through inside and outside opening because adopt open processing and formation, when historical facts or anecdotes is executed QC, have and detect easily, the advantage that measuring device is simplified.

Hold above-mentioned, compared to known techniques, with nut body 21 and the assembling opening 212,213 thereof of manufacture method formation of the present invention, can see through open processing mode and form, not only significantly reduce the difficulty of small structure processing and expend time in, being more conducive to improve the precision of assembling opening 212,213.

Fig. 2 C is the perspective view of the return channel of the ball screw shown in Fig. 2 A, please also refer to Fig. 1 to Fig. 2 C, before description of step S13, first for return channel explanation.Can be single structure according to the present invention's return channel, can also be shown in Fig. 2 C more than the composite structure of assembly.In the time that return channel is single structure, processing procedure is comparatively simple, and so the composite structure of multicompartment has more and can improve precision, reduces the problem of inner processing ball channel difficulty.

In the present embodiment, system forms return channel 22 as example to combine two reflux assemblies, and for clearly demonstrating thin portion structure and the compound mode of two reflux assemblies, be referred to as with one first reflux assembly 221 and one second reflux assembly 222 respectively, so and unrestricted both must be identical or different.

The first reflux assembly 221 has one first card access surface 221a and with respect to one of first card access surface 221a the first installation surface 221b, relatively, the second reflux assembly 222 has one second card access surface 222a and with respect to one of second card access surface 222a the second installation surface 222b.The card access surface person that is referred to as, while being reflux assembly combination, the face of butt mutually; The installation surface person that is referred to as, while being the assembling of reflux assembly and nut body, the face connecting with nut body.

For strengthening clamping stability, in the present embodiment, the first card access surface 221a has two engagement portion 221c, the second card access surface 222a corresponding two engagement portion 221c has two trip 222c, and two reflux assemblies see through above-mentioned trip 222c and engagement portion 221c and mutually engage and form aforementioned return channel 22.On the other hand, the combination definable that sees through the first reflux assembly 221 and the second reflux assembly 222 goes out a backflow hole 223, the return flow line 214 on backflow hole 223, nut body 21 and the aforementioned mutual close communication of ball channel and form a ball-recirculation approach.

Certainly, in other embodiments, can also be by the location swap of trip and engagement portion, or other engaging or fixed structure are additionally set on two reflux assemblies, about all non-institute of the present invention of shape, setting position and the quantity limitr of trip and engagement portion.

Fig. 2 D is the combination schematic diagram of the return channel of the ball screw shown in Fig. 2 C, please refer to shown in Fig. 2 C and Fig. 2 D, is combined to form after return channel 22 in the first reflux assembly 221 and the second reflux assembly 222, and two reflux assemblies can form a leak stoppage structure L jointly simultaneously.Specifically, the first reflux assembly 221 has a slot part 221d in the first card access surface 221a, and the second reflux assembly 222 has a protuberance 222d in the second card access surface 222a, and the shape of protuberance 222d and setting position produce the effect of similar eaves.Protuberance 222d and slot part 221d be the common leak stoppage structure L that forms in the time that first, second reflux assembly 221,222 engages mutually.The protuberance 222d of the present embodiment indication and slot part 221d system refer in particular to " stopping oily protuberance " and " only oil groove portion ", specifically, because the setting party of protuberance 222d and slot part 221d is to being the part ball-recirculation approach CP being surrounded in return channel 22, therefore when lubricant oil is in the time that this part ball-recirculation approach CP oozes out, because what will be formed through protuberance 222d and slot part 221d has a leak stoppage structure L that at least secondary bends, also be difficult for oozing out again return channel 22 surfaces, in other words, by (as shown in Figure 2 D) of seeing sight outside return channel 22, the gap 224 that the first card access surface 221a and the second card access surface 222a are formed is not the shape of straight line, and be the configuration (thering is secondary bending) that presents a labyrinth-like.Be with, see through the design of leak stoppage structure L, return channel 22 can prevent that the lubricant oil that is added into backflow hole 223, return flow line 214 and ball channel from being oozed out by the gap 224 between first, second reflux assembly 221,222, better, can prevent that knockdown return channel 22 is when the oil seepage problem that is subject to external force or produces during because of the problem on deformation of heat treatment generation.

Should be noted that especially, the dual side-edge that first reflux assembly 221 of the present embodiment lies in the first card access surface 221a is provided with two slot part 221d, and be provided with two protuberance 222d in the corresponding two slot part 221d of the second reflux assembly 222, can provide leak-stopping to two of easy seepage on return channel 22 further by this, prevent the effect of oozing out, only in practical application, can also be by the location swap of slot part 221d and protuberance 222d, or in first, the second reflux assembly 221, other leak stoppage structure L is additionally set on 222, in addition, about the shape of slot part 221d and protuberance 222d, the all non-institute of the present invention of setting position and quantity limitr.

Fig. 2 E is that the ball screw shown in Fig. 2 A is in the generalized section at hatching A-A place.Please refer to shown in Fig. 2 B and Fig. 2 E, in the present embodiment, nut body 21 has two groups in two sides of assembling opening 212,213 and connects inclined-plane 215,216, and return channel 22 is to connect inclined-plane 215,216 with two groups of nut body 21 respectively with first, second installation surface 221b, the 222b of its two reflux assembly to contact, certainly, first, second installation surface 221b, 222b have with these two groups and connect the corresponding gradient in inclined-plane 215,216.

Hold above-mentionedly, shown in Fig. 2 E, two groups of extensions that connect inclined-plane 215,216 have an angle of cut θ, and certainly, indication it " extension " is virtual extension herein.Wherein, the angle of angle of cut θ system can be between 1～170 degree.See through the design of gradient, can effectively prevent the direction displacement of return channel 22 toward screw rod 1, produce spacing effect.In the present embodiment, the extension that the group that is referred to as connects inclined-plane 215,216 means that the direction of axle among nut body 21 extends, and should be noted that especially, and the nut body 21 it " direction of axis " of indication means the direction parallel with the major axis of screw rod 1 herein.Particularly, it is to present a shape extending out with respect to screw rod 1 that two groups of the present embodiment connect inclined-plane 215,216, in the time of combination return channel 22, has the advantage of the assembling of promoting and location easness.

In addition, in the present embodiment, return channel 22 be with screw 23 respectively by each reflux assembly screw lock in nut body 21, non-limiting person for this reason, in practical application, return channel 22 also can see through engaging, bonding, mode sealed, chimeric or its combination and be fixed on nut body 21, or even at return channel 22 contact position with nut body 21, add viscose to bind by the first end face ES1 or the second end face ES2 outside, do not limit in this.

In addition, in the present embodiment, ball screw has two dust preventing component 24.Dust preventing component 24 has more a positioning part 241, and in the time that dust preventing component 24 and nut body 21 are assembled, two positioning parts 241 are to be individually fixed in assembling opening 212,213.Compared to the combination of known dust preventing component, the present invention sees through group and connects the coordinating of positioning part 241 of inclined-plane 215,216 and dust preventing component 24, has exempted the additional step of screw locking, has simplified the combination of dust preventing component 24 and nut body 21; More preferably, because positioning part 241 is fixed in assembling opening 212,213 and cannot be rotated, the effect that provides restriction dust preventing component 24 to rotate, and then dust preventing component 24 is provided give the better dust-proof effect of nut body 21.

In addition, dust preventing component 24 has more a tongue 242, and tongue 242 is arranged in the some of edge 243 within dust preventing component 24.Specifically, tongue 242 is by continuing to extend to the heart among dust preventing component 24 part that defined out on inner edge 243, and the shape extending out is ligulate or semilune, therefore can be referred to as by tongue 242.Then in fact the present invention is not limited with above-mentioned shape, in practical application, even if shape is not exclusively similar to ligulate or semilune, the scope also being contained by the present invention.

The assembling that sees through step S13 forms nut 2 structures, gets final product sheathed nut body 21 in screw rod 1 in step S15 and step S17, to form ball channel between nut body 21, return channel 22 and screw rod 1, and plural ball 3 is placed in this ball channel.Only the actual start of ball screw S and application mode can the persons of understanding for person with usual knowledge in their respective areas of the present invention, repeat no more in this.

Fig. 3 is the generalized section according to the ball screw shown in another embodiment of the present invention, please refer to shown in Fig. 3, in the present embodiment, number feature more than the nut body 21 ' of ball screw is identical with having of previous embodiment with return channel 22 ', only two groups connect inclined-plane 215 ', 216 ' the extension system direction away from axle among nut body 21 ', particularly, it is to present the shape of an indent with respect to screw rod 1 ' that two groups of the present embodiment connect inclined-plane 215 ', 216 ', and better dust-proof effect is provided in addition.

In sum, according to the manufacture method of the present invention's ball screw, be to see through on nut body, to form the assembling opening that connects surface and internal surface outside nut body, for return channel setting.Specifically, assembling opening not only connects this inside and outside of nut, and be that the direction to other end is extended from one of nut body end face, therefore assemble opening and present an open hatch frame with respect to nut body, be applicable to making by open processing method.And open processing method, such as turnning and millings etc., are relatively easy, and are easy to the manufacturing process of QC.

The foregoing is only illustrative, but not be restricted person.Any spirit and category that does not depart from the present invention, and equivalent modifications or change that it is carried out all should be contained in rear attached claim.

[symbol description]

1,1 ': screw rod

11: rail slot

2: nut

21,21 ': nut body

211: interior ball grooves

212,213: assembling opening

214: return flow line

215,215 ', 216,216 ': group connects inclined-plane

22,22 ': return channel

221: the first reflux assemblies

221a: the first card access surface

221b: the first installation surface

221c: engagement portion

221d: slot part

222: the second reflux assemblies

222a: the second card access surface

222b: the second installation surface

222c: trip

222d: protuberance

223: backflow hole

224: gap

23: screw

24: dust preventing component

241: positioning part

242: tongue

243: inner edge

3,3 ': ball

A: hatching

CP: circulation approach

ES1: the first end face

ES2: the second end face

IS: internal surface

L: leak stoppage structure

OS: outer surface

S: ball screw

θ: the angle of cut

S11～S17: step

Claims

1. a manufacture method for ball screw, comprises the following steps:

On a nut body, form at least one assembling opening, wherein this assembling opening system extension of the direction to other end from one of this nut body end face, and connect surface and internal surface outside this nut body;

Assemble a return channel to this assembling opening;

Sheathed this nut body is in a screw rod, to form a ball channel between this nut body, this return channel and this screw rod; And

Accommodating plural ball is in this ball channel.

2. the manufacture method as described in the 1st of claim, wherein this assembling opening

System is with turnning and milling or cut

The mode of cutting processing forms.

3. the manufacture method as described in the 1st of claim wherein forms after this assembling opening on this nut body, more comprises the following steps:

Grind wall within this assembling opening.

4. the manufacture method as described in the 1st of claim wherein more comprises the following steps before the step of this return channel of assembling:

Combine two reflux assemblies and form this return channel, and this two reflux assembly has respectively a card access surface and with respect to one of this card access surface installation surface, this return channel system contacts with this nut body with this two installation surface.

5. the manufacture method as described in the 4th of claim, wherein this two reflux assembly one of them there is a trip in this card access surface, wherein another has an engagement portion in this card access surface, and this two reflux assembly sees through this trip and this engagement portion and mutually engages and form this return channel.

6. the manufacture method as described in the 4th of claim, wherein forms after this return channel in this two reflux assembly of combination, more comprises the following steps:

Form a leak stoppage structure, wherein this two reflux assembly one of them there is a protuberance in this card access surface, wherein another has a slot part in this card access surface, and this protuberance and this slot part common this leak stoppage structure that forms in the time that this two reflux assembly engages mutually.

7. the manufacture method as described in the 6th of claim, wherein this reflux assembly has respectively two these protuberances in the dual side-edge of this card access surface, and another this reflux assembly has respectively two these slot parts in the dual side-edge of this card access surface.

8. the manufacture method as described in the 4th of claim, wherein this nut body has two groups in two sides of this assembling opening and connects inclined-plane, these the two groups extensions that connect inclined-plane have an angle of cut, and this return channel system connects inclined-plane with this two installation surface and this nut body these two groups and contacts.

9. the manufacture method as described in the 6th of claim, wherein the angle of this angle of cut system is between 1～170 degree.

10. the manufacture method as described in the 6th of claim, wherein these two groups connect the direction of extensions system axle among this nut body on inclined-plane.

11. manufacture methodes as described in the 6th of claim, wherein these two groups meet the extensions system on inclined-plane away from the direction of axle among this nut body.

12. manufacture methodes as described in the 1st of claim, more comprise the following steps:

Assemble a dust preventing component to this assembling opening, this dust preventing component has a positioning part, and this positioning part system is fixed in this assembling opening.