CN100595364C

CN100595364C - Method for making sliding part and said sliding part

Info

Publication number: CN100595364C
Application number: CN200410056706A
Authority: CN
Inventors: 北村哲弥; 青木彦治; 金田英树
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2003-08-07
Filing date: 2004-08-09
Publication date: 2010-03-24
Anticipated expiration: 2024-08-09
Also published as: CN1580347A; CN101798729A; JP2005052507A; CN101798729B; JP4745604B2

Abstract

The invention provides a method for manufacturing sliding parts which easily forms an oil sump for increasing a cycle for supplying a lubricant to make the seizing last longer and sliding parts with oil deposits. In the method for manufacturing a needle thread take-up shaft, a Cr coating film 29 and a DLC coating film 30 are continuously formed in positions corresponding to the sliding parts on the surface of a base material 27 by UBM sputtering in a metallic film forming process and a DLC film forming process. A masking member 34 with a plurality of circular holes 35 is fitted to make close contact with the surface of the DLC coating film 30 in a masking process. A recessed part 31 to be the oil sump 32 is formed by performing plasma etching on an area of the DLC film 30 exposed through the hole 35 of the masking member 34 in an etching process.

Description

The manufacture method of sliding part and sliding part

Technical field

The present invention relates to the manufacture method and the sliding part of sliding part, especially, relates to by forming manufacture method and the sliding part that the sliding part of non-agglutinating property improves in oil storage portion at sliding part.

Background technology

In the past, for example, in Sewing machines, a plurality of sliding parts are slided over each other to be assembled freely.In these sliding parts, general for the sintering that prevents its sliding part and reduce wearing and tearing, on sliding part supplying lubricating oil or surface, form the high tunicle of mar proof at sliding part.

For example, (, disclosed the Sewing machines that on the surface of the sliding part of the shank suitable, forms DLC tunicle (Diamond LikeCarbon tunicle) at Japanese Patent Application Publication 2003-111990 communique with sliding part with reference to Fig. 5～Fig. 8).The DLC tunicle, because coefficient of friction low (generally about 0.1 below) and be high rigidity, mar proof and sliding be excellence very, this is known.This DLC tunicle utilizes the chemical vapor deposition method of the physical vapor deposition of for example UBM sputter (Unbalanced Magnetron Sputtering) etc. and CVD (Chemical Vapor Deposition) etc. to be formed on the surface of sliding part.

Again, in this Sewing machines, in order further to improve the mar proof of the sliding part of described shank, for the sliding part of the shank supporting member that supports described shank slidably, the aluminum alloy materials that use is easy and described DLC tunicle slides sleekly etc.This aluminum alloy materials, the entangled bonded (Dangling Bond) by preventing the DLC tunicle and with the cut-out that combines of the hydrogen of its terminal, thus, can prevent the progress that the graphite (Graphite) of described DLC tunicle is changed, thereby can improve the mar proof of DLC tunicle.

, if consider,, yet need the sliding part supplying lubricating oil even for example made such structure from the aspect that prevents sintering.But, even the sliding part to shank and shank supporting member has been supplied with lubricating oil, because the surface of described sliding part slides over each other, described lubricating oil can not be remained on this sliding part for a long time, from short time of supplying lubricating oil (for example, less than 1000 hours) in, described sliding part will produce sintering.

In order to prevent the sintering of sliding part, as long as the operator continually to sliding part be lubricated oil supply just passable, but generally on Sewing machines sliding part a plurality of positions are arranged, and, the position of supplying lubricating oil simply in addition is so this operation needs very many labours.Therefore, consider to have and on the DLC tunicle, form the oil storage portion that constitutes by concavo-convex groove, the method that lubricating oil can not flowed out from sliding part in the short time, but it is general because this DLC tunicle is the thickness of number μ m degree, so will with the cutting etc. machining form described concavo-convex, on precision be very the difficulty.

Summary of the invention

The objective of the invention is to, provide by the recess that on the DLC of sliding part tunicle, is provided as oil storage portion improve lubricating oil confining force, give the manufacture method and the sliding part of the sliding part of high non-agglutinating property.

The manufacture method of sliding part of the present invention, this sliding part has the sliding part that forms the DLC tunicle at least a portion on the surface of base material, it is characterized in that, this manufacture method has: for the part on the surface of the DLC tunicle of described sliding part is covered, thereby and will have can with the internal diameter of the outer embedding of the sliding part that is formed with the DLC tunicle of sliding part and periphery have a plurality of holes, be embedded in the operation of covering that becomes the state that connects airtight with the DLC tunicle on the sliding part outside in the mode that can take off by aluminium or pottery or the preformed tubular shading member of stainless steel; The DLC tunicle of the part in the hole by will being positioned at described shading member carries out etching and form the etching work procedure of recess, the operation of taking off shading member after etching work procedure from sliding part on described DLC tunicle.

This occasion, preferably, described recess forms as oil storage portion, and, make the described relatively sliding part of described recess total surface area and in about 14%～17% scope shape.

Adopt such structure, at first, utilize plasma etching (Plasma Etching) will be not the DLC tunicle that covers of crested member remove, owing to formed recess as oil storage portion function, so compare with the mechanical work of precision prescribed, can form oil storage portion simply, and can prevent from base material etc. is caused damage.Again, owing to only the shape of shading member is changed, so the shape of described recess is freely changed.

As mentioned above,,, can prevent the outflow of the lubricating oil on the described sliding part for prolonged period of time, so can improve the non-agglutinating property (the sintering life-span is prolonged) of sliding part because this recess can keep lubricating oil by sliding part being formed recess as oil storage portion function.Again, if form described recess in about 14%～17% scope of the total surface area of described relatively sliding part, the supply of the lubricating oil by once just can prolong the sintering life-span of sliding part significantly.

Again, in the occasion of said structure, preferably, before the operation that forms described DLC tunicle, the metal that can implement to form the metal tunicle on the surface of described base material is by membrane process, and when forming described recess, till expose on the surface that described DLC tunicle is etched to described metal tunicle.Thus, even the DLC tunicle is removed,,, can prevent the deterioration that causes by getting rusty of base material etc. so base material can not expose also owing to do not remove the metal tunicle by etching.

Again, in described DLC tunicle, the part of being covered by described shading member has not made mutual sky and has opened the structure that predetermined distance ground is present in a plurality of positions, again, can all constitute identical shape yet, for example is circular structure.Thus, at first, form, stored equably in the whole zone of described sliding part to the lubricating oil that sliding part provided, so can prevent the sintering of the locality of sliding part because the recess sky is opened predetermined distance ground.Again, if with recess all make identical shaped, for example do circularly, the formation operation of described shading member is oversimplified.

Again, in above-mentioned occasion, the etching in the etching work procedure is plasma etching or laser-induced thermal etching preferably, and in the occasion of described plasma etching, described base material adopts the steel material, and its temperature can be carried out in the state below 150 ℃.Thus, in the occasion of plasma etching, owing to only DLC tunicle and oxygen plasma etc. are reacted,, can correctly only remove described DLC tunicle so can not damage between base material and base material and the DLC tunicle formed metal tunicle etc.At this moment, owing to will keep below 150 ℃, so can prevent the distortion of the base material that causes because of described plasma etching at the base material that quenches about 250 ℃.Again, even also can obtain roughly same effect in the occasion of laser-induced thermal etching.

Again, sliding part of the present invention is characterized in that, has: the base material that has sliding part at least on a part; Formed metal tunicle on the surface of the sliding part of base material; Formed DLC tunicle on the surface of described metal tunicle; By utilize etching with the part of described DLC tunicle remove formed as oil storage portion function recess or expose by the surface that utilizes etching that the part of described DLC tunicle is removed to described metal tunicle till formed recess as oil storage portion function.At this moment, preferably, described recess be configured to compulsory figure a plurality of identical shaped, for example be circular, again, described recess forms in about 14%～70% scope with the total surface area of described relatively sliding part.

Again, described sliding part also can be with its sliding part as the portion of reciprocatingly sliding, for example as the thread take-up tension lever axle of the thread take-up tension lever of the constitutional detail that is equivalent to Sewing machines.In the occasion of above-mentioned such structure, even the thread take-up tension lever axle of the Sewing machines of high-speed slide owing to utilize described recess lubricating oil often can be remained on this sliding part, can prevent to produce at sliding part the situation of sintering.

Description of drawings

Fig. 1 is the perspective interior view of two-needle sewing machine.

Fig. 2 is the inside left view that explanation thread take-up tension lever mechanism uses.

Fig. 3 is the part stereogram of sliding part.

Fig. 4 is the part sectional elevation of the summary of sliding part.

Fig. 5 A is the process chart of the manufacture method of explanation sliding part.

Fig. 5 B is the process chart of the manufacture method of explanation sliding part.

Fig. 5 C is the process chart of the manufacture method of explanation sliding part.

Fig. 6 is the key diagram that covers operation.

Fig. 7 is the key diagram of DLC revolution mark (area of DLC tunicle) and sintering life relation.

The specific embodiment

[embodiment]

Below, with reference to accompanying drawing the embodiment that the present invention is applied to the thread take-up tension lever axle of the thread take-up tension lever in the two-needle sewing machine is described.Again, in the following description, as shown in Figure 1, with the direction of operator present position as the place ahead, will from the operator see about as about.

At first, as shown in Figure 1, two-needle sewing machine M has: the long base plate 1 of left and right directions, the socle portion 2 of extending upward from the right part of this base plate 1, the arm 3 that relatively extends to left from this socle portion 2 and base plate 1.

In the inside of arm 3, be equipped with the main shaft 10 of direction extension to the left and right, and below this main shaft 10, be equipped with the shank swinging axle 11 of direction extension to the left and right.Stretch out to the outside from arm 3 right part of main shaft 10, and belt pulley 12 is installed on its front end.Main shaft 10 by the manual operation formula belt pulley 12 or utilize sewing electric motor (not shown) to be rotated driving.

Crank 13 is installed in the left part of main shaft 10, can rotate with this main shaft 10.On this crank 13, be provided with connecting axle 13a integratedly, on this connecting axle 13a, connecting the head 14a of the upper end of toggle-action lever 14 rotationally.Again, the bottom of toggle-action lever 14 is connected with shank link 15 rotationally, and this shank link 15 is fixed on the central portion of columned shank 16.This shank 16, it is supported in up and down on the shank supporting member 17, and stretch out downwards from described arm 3 its bottom, and 2 pins 21 are installed on its front end.

Thread take-up tension lever mechanism 19 as shown in Figure 2, has: thread take-up tension lever 18, connecting elements 22, thread take-up tension lever 18 is bearing in turning cylinder 23 on the two-needle sewing machine M rotationally.Again, thread take-up tension lever 18 has the columned thread take-up tension lever axle 25 of bottom and hangs with the thread take-up tension lever portion 26 that reaches the standard grade.Columned connecting elements 22 is being connected with the rearward end of the head 14a of toggle-action lever 14 rotationally.And, on this connecting elements 22, insert the thread take-up tension lever axle 25 that is connected with thread take-up tension lever 18.Thus, thread take-up tension lever axle 25 forms slidably state of described relatively connecting elements 22.

Here, in the two-needle sewing machine of this spline structure, pass through main shaft 10 when crank 13 transmits when the rotation of sewing electric motor, its revolving force transmits to shank link 15 by toggle-action lever 14.So this shank link 15 moves back and forth shank 16 up and down, thus, 2 pins 21 move back and forth up and down.Again, shank 16, though omit detailed explanation, the rotation by described shank swinging axle 11 drives, with shank supporting member 17 forwards, backwards horizontal direction carry out wobble drive.

Again, when the rotation that utilizes sewing electric motor made crank 13 rotations, the connecting axle 13a of crank 13 made head 14a and connecting elements 22 side by side be rotated driving with circular orbit A shown in Figure 2.Thus, described thread take-up tension lever 25 by 22 guiding of described connecting elements and roughly above-below direction ground reciprocatingly slides, by this reciprocatingly slide, thread take-up tension lever 18 carries out wobble drive on every side described turning cylinder 23, with this, reach the standard grade (not shown) is tightened up.

At this, as shown in Figure 3 and Figure 4, described thread take-up tension lever axle 25 has: the columned base material 27 that is made of the steel material; Formed Cr tunicle 29 on the surface at the position corresponding with the sliding part 28 of this base material 27; Formed DLC tunicle 30 on the surface of this Cr tunicle 29.Again, as shown in Figure 4, on DLC tunicle 30, be formed with a plurality of recesses 31 as oil storage portion 32 functions (following also have the situation that only is called oil storage portion 32), this oil storage portion 32 constitutes by described DLC tunicle 30 is carried out etching, makes described Cr tunicle 29 be the state that exposes.Again, as shown in Figure 3, this recess 31 forms with 90 ° of intervals (predetermined distance) at many places of circumferencial direction and at the stagger compulsory figure of certain altitude of above-below direction, its shape is circular.

Here, with reference to Fig. 5 A～Fig. 5 C and Fig. 6, the Cr tunicle 29 that carries out and DLC tunicle 30 made detailed description by membrane process, the flow process of covering operation and etching work procedure etc., manufacture method on the position corresponding with the sliding part 28 of described thread take-up tension lever axle 25 (base material 27).

At first, for (in other words, the thread take-up tension lever axle 25 of thread take-up tension lever 18 surface at the position of) sliding part 28 correspondences is carried out sputter with Cr as target, forms the thickness of regulation, the Cr tunicle 29 of thick about 0.5 μ m for example with the base material 27 that is made of columned steel material.Then, carry out the sputter of above-mentioned Cr, and carry out simultaneously, the state that the sputtering raste that the sputtering raste of this Cr and graphite is little by little travelled to make graphite increases the sputter of graphite as target.Thus, make DLC tunicle 30 on the surface of Cr tunicle 29, be formed up to the thickness of for example about 1.5 μ m.This occasion, these Cr tunicles 29 and DLC tunicle 30 are exactly the film that utilizes the UBM sputter to form continuously in a vacuum.Here, the hardness of DLC tunicle 30 can be waited by the hydrogen amount and regulate, thus, just can become HV (Vickers Hardness) from hundreds of to about 8000 the high rigidity tunicle that approaches adamantine HV.

Then,, in covering operation,, connect airtight roughly that shape is extraterrestrial to be embedded with shading member 34 cylindraceous for the surface of aforementioned such DLC tunicle 30 that forms as Fig. 5 B and shown in Figure 6, thus, with the surface shaded of described DLC tunicle 30.This shading member 34 for example constitutes with A1, its internal diameter forms and the roughly the same diameter of the profile of DLC tunicle 30, and, the hole 35 (through hole) of a plurality of circles is at the above-below direction sky shape that is arranged in a straight line with opening predetermined distance, and they constitute with 90 ° of intervals and the above-below direction certain intervals ground that staggers in a circumferential direction.Therefore, when being embedded on the DLC tunicle 30 outside with described shading member 34, a part of crested on the surface of DLC tunicle 30, the position corresponding with the hole 35 of described shading member 34 still keeps the state that exposes.

Then, in etching work procedure, at first, with the base material 27 of aforesaid crested, be that thread take-up tension lever 18 is housed in (not shown) in the vacuum tank.And, in described vacuum tank, supply with oxygen, when applying high-frequency (for example 13.8MHz) high voltage, make oxygen ionization and form isoionic atmosphere.So, make DLC tunicle 30 become carbon dioxide or carbon monoxide with the oxygen plasma gas reaction, as shown in Figure 5, the DLC tunicle 30 of crested member 34 part of being covered (part of exposing from shading member 34) not, remove till Cr tunicle 29 exposes with etching, thus, go up a plurality of recesses 31 of formation at sliding part 28 (with reference to Fig. 4) as oil storage portion 32 functions.

Again, in described etching work procedure, will with 250 ℃ of degree quench and tempering after thread take-up tension lever 18, remain on and carry out etching in the state below 150 ℃.Then, thread take-up tension lever 18 is taken out from vacuum tank, as shown in Figures 3 and 4, shading member 34 is taken off from thread take-up tension lever axle 25, thus, just can obtain to have the thread take-up tension lever axle 25 of the sliding part 28 of a plurality of recesses 31 as oil storage portion 32 functions of formation.

Adopt above-mentioned structure, at first, on sliding part 28, formed recess 31 as oil storage portion 32 functions.Therefore, can on this described recess 31, store up and stay lubricating oil, the confining force of the lubricating oil of described sliding part 28 is improved, the non-agglutinating property of thread take-up tension lever axle 25 is improved.Especially, if the total surface area of recess 31 relative sliding surfaces 28 is controlled at about 14%～70% scope, in other words, the total surface area (area of DLC tunicle) of residual DLC tunicle 30 if will not utilize plasma etching to remove, be controlled at about 30%～86% scope as shown in Figure 7, the time (sintering life-span) that then arrives sintering became more than 3000 hours, owing to can give high non-agglutinating property to thread take-up tension lever 18, pretending the dealer does not need sliding part is lubricated oily supply continually, the supply cycle of lubricating oil becomes very long, can reduce the supply operation of operator's lubricating oil significantly.

Again, on the thread take-up tension lever axle 25 of thread take-up tension lever 18, owing to utilize plasma etching to form recess 31 as oil storage portion 32 functions, so compare with machining etc., it is easy that its operation can become.Again, by using plasma etching,, prevent exposing of base material 27, so can protect in order to avoid the deterioration of getting rusty etc. and to cause because of this base material 27 owing to do not remove not with the Cr tunicle 29 of oxygen reaction but only remove DLC tunicle 30 by etching.

Energy again,, the shape in the hole 35 (through hole) of this shading member 34 changed, so will make required shape as the shape of the recess 31 of oil storage portion 32 functions owing to use shading member 34.

Again, recess 31 is circular, and figure according to the rules is being arranged, so can prevent the situation that the lubricating oil locality is offset on sliding part 28, thus, can prevent the sintering of locality.

Again, in the above-described embodiments, utilize the UBM sputter to form DLC tunicle 30, but be not limited thereto, for example, also can utilize the evaporation coating method of the chemistry of the evaporation coating method of the physics beyond the UBM sputter or CVD method etc. to form.

Again, the removal of DLC tunicle etching mode is not limited to plasma etching, also can use following means: for example, and 10 ^-15(Wavelength of Laser is that 870nm, impulse amplitude are 10 for second laser ^-15Second); (Wavelength of Laser is the ultraviolet range to ultraviolet laser, for example, impulse amplitude is that 20～100nm, wavelength are the THG-YAG laser of 353nm: Third Harmonic Generator YAG Laser, or wavelength is the FHG-YAG laser of 265nm: the Solid State Laser of Fourth Harmonic Generator YAG Laser etc.); (wavelength is that 308nm or 248nm, impulse amplitude are 20～30nm) to excimer laser, by etching the DLC tunicle is removed.Especially, from a plurality of directions DLC tunicle irradiating laser is formed oil storage portion, the time of etching work procedure is shortened significantly by utilizing a plurality of laser.Perhaps, by being provided with 1 laser and making laser and the relative position of sliding part moves and forms oil storage portion, just can reduce equipment investment.

Again, shading member 34 is not limited to A1, for example, if the material that pottery (Ceramics) and stainless steel (Stainless) etc. are difficult to get rusty then can suitably change.

Between base material 27 and DLC tunicle 30, form Cr tunicle 29, but also can make the structure that is not provided with this Cr tunicle 29 again.In this occasion, preferably, in etching work procedure, the degree ground that does not expose base material carries out etching and forms recess the DLC tunicle, can utilize the DLC tunicle that base material is protected, and gets rusty preventing.

Again, DLC tunicle 30 is carried out plasma etching till Cr tunicle 29 exposes, the Cr tunicle is exposed.

Again, be not limited to Cr tunicle 29, also can use W tunicle, Ti tunicle, Si tunicle, Ni tunicle etc.

Again, recess 31 forms circle, but is not limited thereto, and also can form rectangle, wire, triangle etc., or be respectively different shapes.Again, mutual interval also can suitably be changed as required.

Again, being not limited to thread take-up tension lever 18 as sliding part, also can be for example shank 16, shank supporting member 17, connecting elements 22 etc., even the sliding part beyond the Sewing machines also can be used the present invention.

Again, carried out continuously by membrane process to etching work procedure from metal, but be not limited thereto, also can carry out respectively according to the situation in time or area.

Claims

1, a kind of manufacture method of sliding part, this sliding part have the sliding part that forms the DLC tunicle at least a portion on the surface of base material, it is characterized in that,

This manufacture method has:

For the part to the surface of the DLC tunicle of described sliding part is covered, thereby and will have can with the internal diameter of the outer embedding of the sliding part that is formed with the DLC tunicle of described sliding part and periphery have a plurality of holes, be embedded in the operation of covering that becomes the state that connects airtight with its DLC tunicle on the described sliding part outside in the mode that can take off by aluminium or pottery or the preformed tubular shading member of stainless steel;

The DLC tunicle of the part in the hole by will being positioned at described shading member carries out etching and form the etching work procedure of recess on described DLC tunicle;

After this etching work procedure, take off the operation of described shading member from described sliding part.

2, the manufacture method of sliding part as claimed in claim 1 is characterized in that, described recess forms oil storage portion.

3, the manufacture method of sliding part as claimed in claim 1 or 2 is characterized in that, described recess is with respect to the total surface area of described sliding part and form in 14%～17% scope.

4, the manufacture method of sliding part as claimed in claim 1 or 2 is characterized in that, before the operation that forms described DLC tunicle, has the metal tunicle that forms the metal tunicle on the surface of described base material and forms operation.

5, the manufacture method of sliding part as claimed in claim 4 is characterized in that, till exposing by the surface that described DLC tunicle is etched to described metal tunicle, forms described recess.

6, the manufacture method of sliding part as claimed in claim 1 is characterized in that, in described DLC tunicle, the part of being covered by described shading member all is not identical shape.

7, the manufacture method of sliding part as claimed in claim 6 is characterized in that, in described DLC tunicle, the part of being covered by described shading member all is not circular.

8, the manufacture method of sliding part as claimed in claim 7 is characterized in that, the etching in the described etching work procedure is a plasma etching.

9, the manufacture method of sliding part as claimed in claim 8 is characterized in that, described base material is the steel material, carries out described plasma etching under described base material is state below 150 ℃.

10, the manufacture method of sliding part as claimed in claim 1 or 2 is characterized in that, the etching in the described etching work procedure is laser-induced thermal etching.

11, a kind of sliding part is characterized in that, is the sliding part made from each described method in the claim 1～10.

12, sliding part as claimed in claim 11 is characterized in that, the sliding part of described base material is the portion of reciprocatingly sliding.

13, sliding part as claimed in claim 12 is characterized in that, is used as the constitutional detail of Sewing machines.

14, sliding part as claimed in claim 13 is characterized in that, described constitutional detail is the thread take-up tension lever axle of thread take-up tension lever.