CN1364668A

CN1364668A - Method for producing ring gear

Info

Publication number: CN1364668A
Application number: CN 02100979
Authority: CN
Inventors: 飯塚博
Original assignee: ITSUKA MANUFACTURING Co Ltd
Current assignee: ITSUKA MANUFACTURING Co Ltd
Priority date: 2001-01-10
Filing date: 2002-01-10
Publication date: 2002-08-21
Anticipated expiration: 2022-01-10
Also published as: CN1166473C; TW544351B; HK1048783B; JP3418180B2; JP2002205137A; HK1048783A1

Abstract

This invention provides a manufacturing method of a ring gear which has short manufacturing time, is excellent in yield of the material, and is capable of reducing the manufacturing cost. A first intermediate product is obtained by forming a bottomed hole having internal teeth on the inner circumference by forging a material. Next, a second intermediate product is formed by punching a hole bottom of the bottomed hole having the internal teeth by a press to form a hole having the internal teeth. Then, a punch is used to perform punching operation on the second intermediate product. In the punching operation, the second intermediate product is fitted in a setting groove part of a fitting groove of a die, and the pressure is applied to an upper part of the second intermediate product by the punch to form recesses in an outer circumferential part of the second intermediate product by a blade part, and to form the ring gear with a part between the recesses forming an arm and having internal teeth.

Description

The manufacture method of ring gear

Technical field

The present invention relates to a kind of manufacture method that is used for the ring gear of car belt mechanism.

Background technology

As the ring gear that is used for car belt mechanism in the prior art, well-known, as shown in figure 11, on interior week, have in the hole of band internal tooth, handle is equipped with on its periphery.This ring gear 4 is to be used for safety belt is rolled driving under situations such as automobile crashes.That is, on the roller 31 by disc spring roll-up mechanism coiling safety belt pinion 32 is set, this pinion 32 is configured in the hole 2 of ring gear 4.Because ring gear 4 usefulness pins 33 are fixed on the base of the roller 31 that supporting can rotate freely, so the internal tooth 3 of ring gear 4 and the external tooth 35 of pinion do not mesh at ordinary times.Yet, when being subjected to impacting, being located at the gunpowder explosion of an end of guiding tube 34 owing to collision etc., the steel ball (not shown) is emitted from guiding tube 34.Handle 1 collision on steel ball and the periphery that is arranged on ring gear 4 highlightedly when cutting off the pin 33 of fixing ring gear 4, rotates ring gear 4.Whereby, the internal tooth 3 of

ring gear

4 and 35 engagements of the external tooth of pinion 32 are rolled driving to safety belt.

And when making above-mentioned this ring gear 4, utilize the technology shown in Figure 10 a～Figure 10 d to make in the prior art.That is, shown in Figure 10 a, after in the blank 30 insertion moulds 36, on blank 30, exert pressure, make blank 30 plastic deformations, be formed on first intermediate products 38 that periphery has protuberance 37 along the direction of arrow among Figure 10 a.At this moment form the rake of keeping out of the way usefulness 40 of blank 30 when being shaped on the blade 39 of mould 36, keep out of the way in order to ensure this, employed blank 30 must be thicker than the thickness of final products.

Then, the E that represents with cross hatch by machining Figure 10 b partly cuts first intermediate products 38, obtains second intermediate products.The above-mentioned part cutting of keeping out of the way that to guarantee first intermediate products 38 in this machining is removed.

Then, shown in Figure 10 c, cut second intermediate products, when forming hole 2, protuberance 37 is cut into the shape of regulation, obtain to have the 3rd intermediate products 41 of handle 1 in periphery.

Follow again, shown in Figure 10 d,, in the hole 2 of the 3rd intermediate products 41, form internal tooth 3 on week by broaching processing.At last, carry out pin-and-hole processing (not shown), obtain ring gear 4.

But, in the above in the example of described prior art, owing to be processed to form internal tooth through repeatedly machining and broaching, so exist the long problem of manufacturing time.In addition, because as blank 30, its thickness must be thicker, thereby also exist the problem that material use efficient is poor, manufacturing cost is high.

Summary of the invention

Therefore, the present invention in view of the above problems, its purpose is to provide a kind of can be had when interior week is provided with the hole of internal tooth with high yield rate manufacturing in short manufacturing time, has the method for the ring gear of outstanding shank at peripheral part.

That is, the manufacture method of ring gear of the present invention, wherein, it includes:

Blank is forged processing, is formed on interior have in the week hole of the band bottom of internal tooth, the operation of acquisition first intermediate products,

Utilize at the bottom of the hole in hole of band bottom of press punching press first intermediate products, have in week in being formed on internal tooth the hole, obtain the operation of second intermediate products,

With blanking apparatus second intermediate products are carried out the operation that stamping-out is processed,

Wherein, blanking apparatus has mould and blanking punch,

Described mould possesses embedding groove is arranged, and can freedom be loaded on the interior sleeve of embedding groove up or down, and be configured in the guide way in the embedding groove,

Described embedding groove includes the assembling slot part in having of the top interior all shape identical with the peripheral shape of second intermediate products, at the blade of bottom from the outstanding shaping slot part of inwall,

Described sleeve has and is shaped with the identical peripheral shape of interior all shapes of slot part and is located at socket teeth on interior week and the internal tooth of second intermediate products is of similar shape, described guide way has and the identical shaped cross section, hole that is provided with the internal tooth of second intermediate products, form the guiding tooth that can make internal tooth and socket teeth engagement at peripheral part

Blanking punch has and the identical peripheral shape of interior all shapes that is shaped with slot part, and on periphery, form and keep out of the way groove,

And stamping-out processing comprises:

Be engaged at the guiding tooth that makes guide way under the state on the socket teeth of sleeve, the mode of the top that makes the guide way outstanding so that internal tooth of second intermediate products and the engagement of guiding tooth from sleeve is embedded into the top of guide way the assembling that is configured to embedding groove in the hole of second intermediate products, with second intermediate products with the operation in the slot part

The blanking punch that mode that slot part cooperates with the blade that is shaped with slot part positions of keeping out of the way with blanking punch is moved, on second intermediate products, exert pressure, utilize blade on the periphery of second intermediate products, to form a plurality of recesses, acquisition makes the part between the recess constitute the operation of the ring gear of described shank

Make sleeve move the ejection ring gear takes out ring gear from mould operation.

According to said method, have hole that internal tooth is set in manufacturing, on periphery, form in the process of ring gear of shank, because except that the cutting process of finished machined, only need to forge, punching press, stamping-out just can, thereby need not the broaching processing of spended time in the prior art, just ring gear can be made at short notice, manufacturing cost can be reduced significantly whereby.

In addition, owing to the guiding tooth engagement of internal tooth in the hole that will be arranged at second intermediate products and guide way, be in to utilize blanking punch to exert pressure under the state of location to carry out stamping-out and process, so can on second intermediate products, form recess accurately.Promptly, stamping-out adds man-hour, inwall by embedding groove stops blank to be kept out of the way to the lateral direction of second intermediate products, simultaneously stop blank keeping out of the way to the interior side direction of second intermediate products by guide way, the stamping-out scrap only slot part of keeping out of the way on the periphery that is located at blanking punch is discharged, so can keep the high-precision stamping-out processing of carrying out simultaneously.

In addition, blade by making mould and the periphery of sleeve engagement location, make the socket teeth of sleeve and the guiding tooth engagement location of guide way, and then make the internal tooth engagement location of the guiding tooth of guide way and second intermediate products, can make internal tooth carry out correct stamping-out and process according to position (position the is mutually) relation of designing institute regulation with the shank of peripheral part as in the hole of the ring gear of final products.

Particularly, since also can utilize as stamping-out add stop man-hour blank keep out of the way usefulness member guide way and add the align member in man-hour as the product that will be obtained ejected, took out the member of usefulness from mould sleeve as stamping-out, so blanking apparatus can be made concise simple structure.

Like this, according to the present invention, although the fairly simple method of this blanking apparatus that to be a kind of employing have fairly simple structure, but still can be with the high ring gear of very high efficiency system manufacturing accuracy.

Further feature of the present invention and the effect of being brought thereof are by obtaining more clearly understanding to the description of implementing optimised form of the present invention with reference to the accompanying drawings.

Description of drawings

Fig. 1 a～Fig. 1 e is a key diagram of representing the manufacture method of ring gear according to a preferred embodiment of the invention;

Fig. 2 a and Fig. 2 b are respectively plane and the cutaway views that utilizes the ring gear of method manufacturing shown in Figure 1;

Fig. 3 is the cutaway view that the forging processing unit (plant) of method shown in Figure 1 is used in expression;

Fig. 4 is the key diagram that the stamping-out processing unit (plant) of method shown in Figure 1 is used in expression;

Fig. 5 is the A-A cutaway view of Fig. 4;

Fig. 6 is the B-B cutaway view of Fig. 4;

Fig. 7 is the C-C cutaway view of Fig. 4;

Fig. 8 is the D-D cutaway view of Fig. 4;

Fig. 9 a is the cutaway view of blade; Fig. 9 b is the cutaway view of sleeve; Fig. 9 c is the cutaway view of guide way; Fig. 9 d is the cutaway view of drift; Fig. 9 e is the cutaway view of stamping-out scrap;

Figure 10 a～Figure 10 d is the key diagram of expression ring gear manufacture method of the prior art;

Figure 11 is the key diagram of the user mode of expression ring gear of the prior art.

The specific embodiment

Describe the manufacture method of ring gear according to a preferred embodiment of the invention with reference to the accompanying drawings in detail.

The ring gear 4 of present embodiment has internal tooth 3 on interior week, have a plurality of shanks (projection) 1 at peripheral part, is used for car belt mechanism, according to for example order manufacturing shown in Fig. 1 a～Fig. 1 e.

At first, forge the blank (machined object) 30 shown in the manuscript 1a, make first intermediate products 5 shown in Fig. 1 b, that have the hole 2a of the band bottom that on interior week, forms internal tooth 3.In order to obtain this first intermediate products 5, for example, as shown in Figure 3, discoid blank 30 is assembled to forging with in the mould 20.Then, utilize 22 pairs of machined objects of drift of the protuberance 21 that on periphery, is provided with tooth shaping usefulness to forge processing, can obtain first intermediate products 5 shown in Fig. 1 b.The operation of this acquisition first intermediate products 5 is forging process.In addition, in Fig. 3, numbering 23 is liners that the demoulding is used, and after 5 processing of first intermediate products, demoulding bolt 24 is risen, and utilizes release liner 23 that first intermediate products 5 are taken out from forging to use the mould 20.

Secondly, utilize the bottom 19 in hole of the hole 2a that has the bottom of press punching press first intermediate products 5, have the through hole 2 of internal tooth 3 in being formed on week.Whereby, obtain second intermediate products 6 shown in Fig. 1 c.The operation of this acquisition second intermediate products 6 is stamping procedures.

Then, second intermediate products 6 are carried out blank operations, make shown in Fig. 1 d, Fig. 2 a and Fig. 2 b on interior week, have an internal tooth 3 in, at the ring gear 4 of the outstanding a plurality of shanks 1 of peripheral part.This blank operation for example can utilize blanking apparatus shown in Figure 4 to carry out.

This blanking apparatus mainly constitutes the embedding groove 11 of opening above being formed on the mould 7 by mould (die) 7 and blanking punch 12.This embedding groove 11, its top formation assembling constitutes and assembles the shaping groove 10 that is communicated with groove 8 with slot part 8, its underpart.

Assembling has the interior all shape identical with the peripheral shape of second intermediate products 6 with groove 8.Assembling must be bigger than the length of (highly) direction about second intermediate products 6 with the length setting of groove 8 above-below directions.On the other hand, be shaped with on the slot part 10, from the outstanding a plurality of blades 9 of its inwall.Fig. 9 a represents the cutaway view of blade 9.

In Fig. 4, but numbering 13 move for easy on and off in be loaded on and inlay with the interior sleeve of slot part 11.This sleeve 13 as shown in Figure 5, have be shaped with the identical peripheral shape of interior all shapes of groove 10 in, Zhou Weiyu is located at the identical shape of internal tooth 3 in the hole of second intermediate products 6 in it.That is, on the periphery of sleeve 13, form the mating groove 26 that cooperates with blade 9, on the interior week of sleeve 13, form socket teeth 15.Sleeve 13 can move up and down in inlaying with slot part 11 by driving demoulding bolt 25.Fig. 9 b represents the cutaway view of sleeve 13.

In Fig. 4, numbering 16 is the guide waies of central portion that are configured in the embedding groove 11 of mould 7.Guide way 16 has the cross section identical shaped with the hole 2 of the tooth portion 3 that is provided with second intermediate products 6 as shown in Figure 6, on peripheral part, form can with the guiding tooth 14 of socket teeth 15 engagements of the tooth portion 3 of second intermediate products 6 and sleeve 13.The bottom of guide way 16 is kept by the trench bottom of embedding groove 11.Fig. 9 c represents the cutaway view of guide way 16.

As shown in Figure 5, guiding tooth 14 meshes with the socket teeth 15 of sleeve 13, and simultaneously, the mating groove 26 of sleeve 13 cooperates with blade 9, whereby blade 9, sleeve 13 and guide way 16 difference relative positionings.In addition, sleeve 13 can slide in the positioning states of maintenance and blade 9 and guide way 16 along the vertical direction.

Blanking punch 12 has and the identical peripheral shape of interior all shapes that is shaped with groove 10.That is, as shown in Figure 8, on the outer peripheral face of blanking punch 12, what be provided with the peripheral shape identical with the blade given prominence to the inwall of slot part 10 from being shaped 9 keeps out of the way slot part 17.Thereby, when keeping out of the way slot part 17 and cooperating with blade 9, blade 9 and keep out of the way slot part 17 relative positionings respectively.Fig. 9 d expresses the profile of blanking punch 12.

Adopt above-mentioned blanking apparatus, carry out stamping-out processing of the present invention as follows.In addition, in Fig. 5～Fig. 8, express cutaway view among Fig. 4 respectively along A-A line, B-B line, C-C line and D-D line.

At first, the assembling that second intermediate products 6 is configured in the embedding groove 11 of mould 7 is used in the groove 8.Promptly, be engaged at the guiding tooth 14 that makes guide way 16 under the state on the socket teeth 15 of sleeve 13, the top that makes guide way is outstanding from sleeve, and the mode that meshes with the internal tooth 3 of the guiding tooth 14 of guide way 16 and second intermediate products 6 is embedded into the top of guide way 16 in the hole 2 of second intermediate products 6.

Then, in keeping out of the way after mode that groove 17 cooperates with blade 9 positions blanking punch with blanking punch 12, in the above described manner under the state with the location, assigned position place of second intermediate products 6 in mould 7, exert pressure to the top of second intermediate products 6 by blanking punch 12, by making second intermediate products 6 carry out plastic deformation, at the peripheral part formation recess 18 of second intermediate products 6 along blade 9.At this moment, owing to be under the positioning states that the internal tooth 3 of second intermediate products 6 is directed to along the guiding tooth 14 of guide way 16 second intermediate products 6 to be moved downwards, so can utilize blade 9 to form recess 18 with high accuracy at the peripheral part of second intermediate products 6.

Whereby, can be formed on the periphery of second intermediate products 6 with along the ring gear 4 of the boundary part between the recess 18 that circumferentially adjoins each other as shank 1.By such making ring gear 4, the internal tooth 3 in can correctly being formed on and being formed at according to position (position phase) relation of when design defined on week concerns with (section) position (position mutually) of overlooking of handle 1 on being formed at periphery.In addition, in the processing of above-mentioned stamping-out, stamping-out scrap 27 is discharged upward from the groove 17 of keeping out of the way of the peripheral part of being located at blanking punch 12.Stamping-out scrap 27 for example, is the shape shown in Fig. 9 e.

After the stamping-out processing, blanking punch 12 is moved to the top, drive demoulding bolt 25 then sleeve 13 is moved to the top,, just can from mould 7, take out at an easy rate if utilize sleeve 13 that ring gear 4 is pressed to the top.On the ring gear 4 that utilizes said method to make, shown in Fig. 1 e, carry out the finishing machining, thereby the same with the prior art then processing (not shown) that carries out pin-and-hole becomes finished product.

According to ring gear manufacture method of the present invention, except that the finishing cutting process, as long as it is just passable to carry out a series of forging, extruding and stamping-out processing, thereby, do not need as prior art, to carry out the broaching processing of spended time, can shorten manufacturing time significantly, make ring gear with higher efficient.In addition, compare with almost all relying on the method for the prior art of machining, the utilization rate height of blank is so can reduce cost significantly.

Claims

1, a kind of have in the hole that internal tooth was set on interior week, has the manufacture method of the ring gear of outstanding shank at peripheral part, it is characterized in that, comprises following operation:

Wherein, blanking apparatus has mould and blanking punch,

Described sleeve has and is shaped with the identical peripheral shape of interior all shapes of slot part and is located at socket teeth on interior week and the internal tooth of second intermediate products is of similar shape,

Described guide way has and the identical shaped cross section, hole that is provided with the internal tooth of second intermediate products, forms the guiding tooth that can make internal tooth and socket teeth engagement at peripheral part,

And stamping-out processing comprises: