CN110023003A

CN110023003A - Metalwork, flat die thread rolling roller, externally threaded forming method

Info

Publication number: CN110023003A
Application number: CN201780072297.4A
Authority: CN
Inventors: 长谷川慎泰
Original assignee: NGK Spark Plug Co Ltd
Current assignee: Niterra Co Ltd
Priority date: 2016-11-25
Filing date: 2017-11-17
Publication date: 2019-07-16
Anticipated expiration: 2037-11-17
Also published as: WO2018097043A1; DE112017005987T5; CN110023003B; JP2018085265A; JP6345222B2

Abstract

It is properly formed external screw thread.It include that the first screw thread formation part and the second screw thread form part in the threaded portion that the metalwork of tubular is arranged.It is thick that second screw thread forms the thickness that the thickness at the slot bottom of part is formed than the first screw thread at the slot bottom of part.Also, it is small that the first screw thread forms the thread depth that the thread depth at part is formed than the second screw thread at part.Moreover, flat die thread rolling roller has the rolling portion comprising groove portion and tooth portion.The groove depth formed at externally threaded first thread rolling part to the first thin metalwork part of metalwork in rolling portion is smaller than the groove depth formed at externally threaded second thread rolling part to the second thick metalwork part of metalwork in rolling portion.By such flat die thread rolling roll-in in the state of metalwork, by make metalwork along rolling portion relative rotation and metalwork formed external screw thread.

Description

Metalwork, flat die thread rolling roller, externally threaded forming method

Technical field

This specification is related to forming externally threaded technology on metalwork.

Background technique

In the past, the various devices such as spark plug, glow plug, sensor (for example, oxygen concentration sensor) used tubular Metalwork.It is formed on metalwork for being screwed into the internal screw thread of mounting hole (for example, the mounting hole for being set to internal combustion engine) External screw thread.

Citation

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2015-141781 bulletin

Summary of the invention

Subject to be solved by the invention

The different multiple portions of wall thickness of the external screw thread sometimes in metalwork are formed.Forming such externally threaded situation Under, unfavorable condition is generated sometimes.For example, will form small bumps sometimes at the top of the thread of the relatively thin part of wall thickness. This is because the relatively thin part of wall thickness can significantly be deformed towards central axis, therefore it is unable to ensure needed for the formation of thread The amount of material and form unsuitable thread.

Subject description discloses one kind can be properly formed externally threaded technology.

Solution for solving the problem

This specification for example discloses Application Example below.

A kind of [Application Example 1] metalwork is the metalwork of the tubular extended along the direction of axis, wherein the metalwork With being formed in outer peripheral surface along the externally threaded part i.e. threaded portion of the direction of axis extension, the threaded portion includes: First screw thread forms part, is the part of a part of range in the gamut of the threaded portion；And second screw thread formed part, The position in the direction of the axis is different from first screw thread formation part, and the externally threaded slot bottom and the metal First screw thread described in thickness, that is, slot thickness rate with the direction of the axis vertical take-off between the inner peripheral surface of part forms the slot at part Thick, first screw thread forms height, that is, thread depth from the externally threaded slot bottom to crest at part than described the The thread depth that two screw threads are formed at part is small.

According to this structure, the form of thread that the first screw thread forms part can be reduced at the amount of required material, therefore energy It is enough properly formed the first thin screw thread and forms the external screw thread of part and the external screw thread of thick the second screw thread formation part.

[Application Example 2] in the metalwork that Application Example 1 is recorded, first screw thread forms the externally threaded tooth of part The radius of curvature on top is bigger than the radius of curvature for the externally threaded crest that second screw thread forms part.

According to this structure, the first thin screw thread can be properly formed and form the external screw thread of part and the second screw thread shape of thickness At the external screw thread of part.

A kind of [Application Example 3] flat die thread rolling roller, the first metal for the metalwork in the tubular extended along the direction of axis The position in the direction of the outer peripheral surface of part part and the axis it is different from first metalwork part and with the axis vertical take-off Direction thickness, that is, wall ratio described in wall thickness thickness at the first metalwork part the second metalwork part outer peripheral surface on lead to It crosses rolling and forms the external screw thread along the extension of the direction of the axis, wherein the flat die thread rolling roller has rolling portion, the rolling portion Comprising being used to form the groove portion of the externally threaded thread and being used to form the tooth portion of the externally threaded thread groove, the rolling Roll in portion to first metalwork part formed at the externally threaded first thread rolling part from the tooth portion Depth, that is, groove depth of top to the bottom of the groove portion is than forming institute to second metalwork part in the rolling portion The groove depth stated at externally threaded second thread rolling part is small.

According to this structure, the form of thread of the first metalwork part is at the amount of required material than the second metalwork part The form of thread is few at the amount of required material, therefore can be properly formed the external screw thread and thickness of the first thin metalwork part The external screw thread of second metalwork part.

[Application Example 4] in the flat die thread rolling roller that Application Example 3 is recorded, the bottom of the groove portion of first thread rolling part The radius of curvature in portion is bigger than the radius of curvature of the bottom of the groove portion of second thread rolling part.

According to this structure, the external screw thread of the first thin metalwork part and the second metalwork portion of thickness can be properly formed The external screw thread divided.

A kind of [Application Example 5] forming method forms edge in the outer peripheral surface of the metalwork of the tubular extended along the direction of axis The external screw thread that the direction of the axis extends, wherein the formation of the metalwork externally threaded part includes: the first metal Part part is the part of a part of range in the gamut for be formed the externally threaded part；And the second metalwork part, institute The position for stating the direction of axis is different from first metalwork part, and thickness, that is, wall with the direction of the axis vertical take-off Wall thickness at first metalwork part described in thickness rate is thick, and the forming method includes: by flat die thread rolling roller described in Application Example 3 or 4 First thread rolling part be pressed on first metalwork part of the metalwork, will be described in the flat die thread rolling roller Second thread rolling part is pressed on second metalwork part of the metalwork；And in first thread rolling part quilt First metalwork part and second thread rolling part is pressed on to be pressed in the state of second metalwork part, Make the metalwork along the rolling portion relative rotation of the flat die thread rolling roller, thus in first metalwork part and institute It states the second metalwork part and forms the external screw thread.

According to this structure, external screw thread can be properly formed to the first metalwork part and the second metalwork part.

It should be noted that the technology of this disclosure can be realized with various forms, for example, can with metalwork, Flat die thread rolling roller forms externally threaded method to metalwork using flat die thread rolling roller, the spark plug for having metalwork, has metalwork The forms such as glow plug, the sensor for having metalwork are realized.

Detailed description of the invention

Fig. 1 is the cross-sectional view for having the spark plug 100 as an embodiment of metalwork.

Fig. 2 is the flow chart for indicating to be formed an example of the method for the threaded portion of base metal part 50 57.

Fig. 3 is the skeleton diagram of the formation of threaded portion 57.

Fig. 4 is the skeleton diagram for indicating the case where forming threaded portion.

Fig. 5 is the skeleton diagram of flat die thread rolling roller with the reference example for the threaded portion for being formed in base metal part.

Fig. 6 is the skeleton diagram of flat die thread rolling roller with the embodiment for the threaded portion for being formed in base metal part.

Specific embodiment

A. embodiment:

A-1. the structure of spark plug 100:

Fig. 1 is the section view for having the spark plug 100 (also referred to as ignition spark plug 100) as an embodiment of metalwork Figure.The flat of the central axis CL (also referred to as " axis CL ") and the central axis CL comprising spark plug 100 of spark plug 100 is shown in figure Section.Hereinafter, by the direction parallel with central axis CL be also referred to as " direction of axis CL ", or referred to as " axis direction " or " front-rear direction ".The direction vertical with axis CL is also referred to as " radial direction ".By the circumference of the circle centered on axis CL to also referred to as For " circumferential direction ".Extreme direction Df or front direction Df before lower direction in Fig. 1 in the direction parallel with central axis CL is known as, will be upper The also referred to as rear extreme direction Dfr or rear direction Dfr in direction.Preceding extreme direction Df is aftermentioned from terminal metal piece 40 towards central electrode 20 direction.Moreover, the side preceding extreme direction Df in Fig. 1 to be known as to the front end side of spark plug 100, by the rear extreme direction Dfr in Fig. 1 Side is known as the rear end side of spark plug 100.

Spark plug 100 includes the insulator with the tubular along the axis CL through hole 12 (also referred to as axis hole 12) extended 10；In the central electrode 20 that the front end side of through hole 12 is kept；In the terminal metal piece 40 that the rear end side of through hole 12 is kept；? The resistor body 73 being configured in through hole 12 between central electrode 20 and terminal metal piece 40；With central electrode 20 and resistor body 73 Contact and by these components 20,73 electrical connection electric conductivity the first sealing 72；It is connect with resistor body 73 and terminal metal piece 40 Touching and by these components 73,40 electrical connection electric conductivity the second sealing 74；In the tubular that the peripheral side of insulator 10 is fixed Base metal part 50；And one end be engaged in base metal part 50 front end face 55 and the other end across interval g and with middle electrocardio The relatively configured grounding electrode 30 in pole 20.

The large-diameter portion 14 of largest outside diameter is formed in the substantial middle of the axis direction of insulator 10.It is leaned on than large-diameter portion 14 The position of rear end side is formed with rear end side main part 13.Compare rear end side being formed with outer diameter by the position of front end side than large-diameter portion 14 The small front end side main part 15 of main part 13.Front end side successively shape is positioned against be located further forward end side than front end side main part 15 At having contracting outer diameter part 16, leg 19.The outer diameter of contracting outer diameter part 16 is gradually reduced towards front direction Df.Near contracting outer diameter part 16 (being in the example in fig 1 front end side main part 15) is formed with the contracting inside diameter 11 that internal diameter is gradually reduced towards front direction Df.Absolutely Edge body 10 is preferred consider mechanical strength, calorific intensity, electric strength and formed, for example, being fired to aluminium oxide and formed (can also be with Using other insulating materials).

Central electrode 20 is metal component, is configured at the end of the side front direction Df in the through hole 12 of insulator 10 Portion.Central electrode 20 have generally cylindrical stick portion 28 and engaged with the front end in stick portion 28 (for example, laser welding) first End 29.The axle portion 27 that stick portion 28 has part, that is, head 24 of the side rear direction Dfr and connect with the side front direction Df on head 24. Axle portion 27 and axis CL extend towards front direction Df in parallel.The part of the side front direction Df in head 24, which is formed, to be had than axle portion The lip portions 23 of the big outer diameter of 27 outer diameter.The face of the side front direction Df of lip portions 23 is by contracting inside diameter 11 of insulator 10 Support.Axle portion 27 is connect with the side front direction Df of lip portions 23.First end 29 is engaged with the front end of axle portion 27.It needs to illustrate It is that the first end 29 can be omitted.

The core 22 that stick portion 28 has outer layer 21 and configures in the inner circumferential side of outer layer 21.Outer layer 21 compares core by oxidative resistance 22 excellent material (for example, alloy comprising nickel as principal component) formation.Here, principal component refers to containing ratio (weight percent Than (wt%)) highest ingredient.Core 22 is by the high material of thermal conductivity ratio outer layer 21 (for example, fine copper, comprising copper as principal component Alloy etc.) formed.First end 29 is using the material more excellent than axle portion 27 for the durability of electric discharge (for example, iridium (Ir), platinum (Pt) noble metals such as) it is formed.Axis of a part of the front end side comprising the first end 29 in central electrode 20 from insulator 10 Expose 12 side forward direction Df of hole.It should be noted that core 22 can be omitted.

Terminal metal piece 40 is the rodlike component extended parallel to axis CL.Terminal metal piece 40 uses electric conductivity material Material forms (for example, metal comprising iron as principal component).Terminal metal piece 40 has towards the tactic cap of front direction Df Department of assembly 49, lip portions 48, axle portion 41.Axis hole 12 from axle portion 41 to insulator 10 the side rear direction Dfr partial insertion.Cap dress It is exposed outside with portion 49 in the lateral axis hole 12 in the rear end of insulator 10.

In the axis hole 12 of insulator 10, configured with for inhibiting electrical between terminal metal piece 40 and central electrode 20 The resistor body 73 of the noise of property.Resistor body 73 uses conductive material (for example, mixture of glass, carbon particle, ceramic particle) It is formed.The first sealing 72 is configured between resistor body 73 and central electrode 20, resistor body 73 and terminal metal piece 40 it Between be configured with the second sealing 74.Above-mentioned sealing 72,74 is using conductive material (for example, metallic and and resistor body The mixture of the identical glass of the glass that 73 material includes) it is formed.Central electrode 20 passes through the first sealing 72, resistor body 73, the second sealing 74 and be electrically connected with terminal metal piece 40.

Base metal part 50 is the component with the tubular along the axis CL through hole 59 extended.In base metal part 50 Through hole 59 is inserted into insulator 10, and base metal part 50 is fixed on the periphery of insulator 10.Base metal part 50 uses conduction material Expect that (for example, the metals such as carbon steel comprising the iron as principal component) are formed.A part of the side front direction Df of insulator 10 is to passing through Through-hole 59 exposes outside.Moreover, a part of the side rear direction Dfr of insulator 10 is exposed outside to through hole 59.

Base metal part 50 has tool engagement portion 51, main part 52.Tool engagement portion 51 be the spanner of spark plug (not Diagram) chimeric part.Main part 52 is the part of the front end face 55 comprising base metal part 50.In the outer peripheral surface of main part 52 It is formed with the threaded portion 57 for screwing togather with the mounting hole of internal combustion engine (for example, petrol engine).Threaded portion 57 is along axis CL The formation that extends of direction have externally threaded part, there is spiral helicine thread and spiral helicine thread groove (diagram is omitted).

It is prominent that outer peripheral surface between the tool engagement portion 51 and main part 52 of base metal part 50 forms oriented radial outside Flange shape lip portions 54 out.Configured with cricoid liner 90 between the threaded portion of main part 52 57 and lip portions 54.Lining Pad 90 is formed and bending the tabular component of such as metal, is crushed and is deformed when spark plug 100 is installed to engine. It, will be between spark plug 100 (specifically, face of the side front direction Df of lip portions 54) and engine by the deformation of the liner 90 Gap sealing, inhibits the leakage of burning gases.It should be noted that liner 90 can be omitted.In this case, lip portions 54 can be with Directly contacted with the part (for example, engine cylinder cover) of the mounting hole of the formation spark plug 100 of engine.

The contracting inside diameter 56 that internal diameter is gradually reduced towards front end side is formed in the main part 52 of base metal part 50.In master Front end side gasket 8 is accompanied between the contracting inside diameter 56 of body metalwork 50 and the contracting outer diameter part 16 of insulator 10.In this embodiment party In formula, front end side gasket 8 is (can also be using other materials (for example, metal material copper such as plate ring made of iron Material)).

Portion 53 is riveted tightly by what the position of rear end side was formed with thin-walled in the ratio tool engagement portion 51 of base metal part 50.And And the portion 58 that buckles of thin-walled is formed between lip portions 54 and tool engagement portion 51.In the slave tool card of base metal part 50 Circular ring is inserted between the outer peripheral surface of the rear end side main part 13 of the inner peripheral surface and insulator 10 in conjunction portion 51 to the portion of riveting tightly 53 Component 61,62.Moreover, being filled with the powder of talcum 70 between above-mentioned ring element 61,62.In the manufacture work of spark plug 100 It in sequence, bends and rivets tightly inwardly if portion 53 will be riveted tightly, the portion 58 that buckles deforms (pressure along with the additional of compressing force outward It is bent), as a result, base metal part 50 and insulator 10 is fixed.Talcum 70 is compressed when this rivets tightly process, improves main body Air-tightness between metalwork 50 and insulator 10.Moreover, contracting outer diameter part 16 and base metal part of the gasket 8 in insulator 10 It is pressed, also, will be sealed between base metal part 50 and insulator 10 between 50 contracting inside diameter 56.

Grounding electrode 30 is metal component, is installed with rodlike main part 37 and in the front end of main part 37 34 The second end 39.The end 33 (also referred to as base end part 33) of another party of main part 37 and the front end face 55 of base metal part 50 It engages (for example, resistance welding).Main part 37 extends from the base end part 33 engaged with base metal part 50 towards preceding extreme direction Df, It is bent towards central axis CL, reaches front end 34.Part (the example of the side rear direction Dfr of front end 34 is fixed in second end 39 Such as, laser welding).Second end 39 of grounding electrode 30 and the first end 29 of electrode 20 form interval g.That is, grounding electrode 30 the second end 39 configuration in the side front direction Df of the first end 29 of central electrode 20, across interval g and with the first end 29 is opposite.Second end 39 is using the material more excellent than main part 37 for the durability of electric discharge (for example, iridium (Ir), platinum (Pt) Equal noble metals) it is formed.It should be noted that the second end 39 can be omitted.

Main part 37 has outer layer 31 and configuration in the internal layer 32 of the inner circumferential side of outer layer 31.Outer layer 31 passes through oxidative resistance ratio The excellent material of internal layer 32 (for example, alloy comprising nickel as principal component) formation.Internal layer 32 is high by thermal conductivity ratio outer layer 31 Material (for example, fine copper, the alloy for comprising copper as principal component etc.) formation.It should be noted that internal layer 32 can be omitted.

A-2. the formation of threaded portion 57:

Fig. 2 is the flow chart for indicating to be formed an example of the method for the threaded portion 57 of base metal part 50 (Fig. 1).Fig. 3 (A), Fig. 3 (B) is the explanatory diagram of the S100 of Fig. 2.In the present embodiment, spiral shell is formed by using a pair of of flat die thread rolling roller 210,220 Line portion 57.Fig. 3 (A) is directed towards the base metal part 50x and flat die thread rolling roller of front direction Df observation formed before threaded portion 57 210,220 skeleton diagram.Fig. 3 (B) is directed towards and the central axis of base metal part 50x (here, the axis CL with Fig. 1 is identical) hangs down The base metal part 50x of straight direction observation and the skeleton diagram of flat die thread rolling roller 210,220.

Flat die thread rolling roller 210,220 is the columned tool extended along respective central axis 210c, 220c.Flat die thread rolling roller 210, it 220 is arranged with central axis 210c, 220c as parallel mode.Flat die thread rolling roller 210,220 is able to center It is rotated centered on axis 210c, 220c.Being connected separately in flat die thread rolling roller 210,220 makes known in the rotation of flat die thread rolling roller 210,220 Driving portion (for example, electric motor) (diagram omit).It is respectively equipped in outer peripheral surface 210s, 220s of flat die thread rolling roller 210,220 It is used to form rolling portion 300a, 300b of threaded portion 57.Rolling portion 300a, 300b have the helical form for being used to form threaded portion 57 Thread spiral helicine groove portion and be used to form threaded portion 57 spiral helicine thread groove spiral helicine tooth portion.It needs Bright, in the present embodiment, the position of the first flat die thread rolling roller 210 is fixed.Second flat die thread rolling roller 220 rubs spiral shell with the hands relative to first Line roller 210 can be moved along the direction vertical with central axis 220c.Being connected in the second flat die thread rolling roller 220 makes the second flat die thread rolling (diagram saves the well known mobile device (for example, linear slide mechanism) that roller 220 is moved along the direction vertical with central axis 220c Slightly).

In S100 (Fig. 2), flat die thread rolling roller 210,220 is rotated to the same direction in the state of being sufficiently separated.Also, Disposal subject metalwork 50x between flat die thread rolling roller 210,220.The central axis CL and flat die thread rolling roller 210,220 of base metal part 50x Central axis 210c, 220c it is parallel.The not shown supports support of base metal part 50x is can be centered on central axis CL Rotation.Also, with the outer peripheral surface of the main part 52x of base metal part 50x (formed threaded portion 57 before main part 52x) and the The mode of outer peripheral surface 210s (that is, the rolling portion 300a) contact of one flat die thread rolling roller 210, base metal part 50x are vertical with axis CL Ground is mobile towards the first flat die thread rolling roller 210.Also, the second flat die thread rolling roller 220 is mobile towards base metal part 50x, and second rubs spiral shell with the hands The outer peripheral surface 220s (that is, rolling portion 300b) of line roller 220 is pressed on the main part 52x of base metal part 50x.Main body gold as a result, Belong to part 50x to be sandwiched between flat die thread rolling roller 210,220, also, rolling portion 300a, 300b of flat die thread rolling roller 210,220 are compacted In the main part 52x of base metal part 50x.

In the state that such rolling portion 300a, 300b are pressed on the main part 52x of base metal part 50x, flat die thread rolling roller 210,220 rotation (S110 (Fig. 2)).Fig. 3 (C), Fig. 3 (D) are the explanatory diagrams of the S110 of Fig. 2.Fig. 3 (C) is same as Fig. 3 (A) Skeleton diagram of the ground towards the front direction Df base metal part 50x observed and flat die thread rolling roller 210,220.Fig. 3 (D) is same with Fig. 3 (B) The base metal part 50x and flat die thread rolling roller 210 that observe towards the direction vertical with the central axis CL of base metal part 50x to sample, 220 skeleton diagram.As shown, base metal part 50x in the state of being sandwiched between flat die thread rolling roller 210,220, corresponds to and rubs with the hands The rotation of thread roller 210,220 and rotate the (direction of rotation of the direction of rotation of base metal part 50x and flat die thread rolling roller 210,220 On the contrary).Threaded portion 57 is formed in the main part 52x of base metal part 50x as a result,.Then, processing terminate by Fig. 2.

It should be noted that base metal part 50x seems to rotate along rolling portion 300a when from rolling portion 300a. When equally, from rolling portion 300b, base metal part 50x seems to rotate along rolling portion 300b.In this way, base metal part 50x is along rolling portion 300a, 300b relative rotation.

Fig. 4 is the skeleton diagram indicated by rolling portion 300x the case where workpiece 400 forms threaded portion.It shows in the figure The section of rolling portion 300x and workpiece 400.Rolling portion 300x and workpiece 400 are by the rolling portion of the flat die thread rolling roller 210 of Fig. 3 (D) The structure that the main part 52x of 300a and base metal part 50x are modeled.Section shown in Fig. 4 is corresponding to Fig. 3 (D) The section of the central axis CL of central axis 210c comprising flat die thread rolling roller 210 and base metal part 50x.The shape of workpiece 400 according to The variation of Fig. 4 (A)~Fig. 4 (F) sequence.

As shown in Fig. 4 (A), rolling portion 300x has the tooth portion 310 for being used to form externally threaded thread groove and is used to form The groove portion 320 of externally threaded thread.In cross section, tooth portion 310 is alternately arranged with groove portion 320.

As shown in Fig. 4 (B), rolling portion 300x is compacted towards workpiece 400.On section, the respective top in multiple tooth portions 310 Portion 311 is contacted with the surface 490 of workpiece 400.Since the state, rolling portion 300x is by further towards the pressing (figure of workpiece 400 4(C)).Multiple tooth portions 310, the engaging-in surface 490 to workpiece 400, respective top 311 as a result,.Two sides (figure at top 311 In top 311 left and right side), a part of workpiece 400 by the tooth portion 310 of rolling portion 300x (specifically, pushed open Part) it is swelled towards rolling portion 300x, form protrusion 430.On section, 1 groove portion 320 of rolling portion 300x is by adjacent 2 A tooth portion 310 clamps.Therefore, in 1 groove portion 320,2 protrusions 430 of workpiece 400 are grand towards the bottom of groove portion 320 321 It rises.Recess portion 440 is formed between this 2 protrusions 430.

Rolling portion 300x is further pressed (Fig. 4 (D)) towards workpiece 400.The tooth portion 310 of rolling portion 300x is further nibbled Enter to workpiece 400.It is further swelled towards the bottom of groove portion 320 321 protrusion 430 of workpiece 400.As a result, in rolling portion 300x 1 groove portion 320 in form 1 tooth portion 410z with recess portion 440 between 2 protrusions 430 and above-mentioned protrusion 430.Rolling When the portion 300x of rolling further is pressed towards workpiece 400 (Fig. 4 (E)), bottom 321 of the protrusion 430 further to groove portion 320. The space of groove portion 320 is then smaller closer to bottom 321, thus with protrusion 430 close to bottom 321 and recess portion 440 reduces.

When rolling portion 300x is further pressed towards workpiece 400 (Fig. 4 (F)), protrusion 430 reaches the bottom of groove portion 320 321.Recess portion 440 is embedded in 2 protrusions 430.The groove portion 320 of rolling portion 300x forms shape identical with groove portion 320 as a result, Tooth portion 410.Moreover, the tooth portion 310 of rolling portion 300x forms the groove portion 420 of shape identical with tooth portion 310.As previously discussed, The tooth portion 310 of rolling portion 300x and groove portion 320 are pressed in workpiece 400, and thus workpiece 400 is plastically deformed, in workpiece 400 Form a groove 420 and tooth portion 410, that is, threaded portion.

A-3. the threaded portion of reference example:

Fig. 5 is the skeleton diagram of flat die thread rolling roller with the reference example for the threaded portion for being formed in base metal part.Fig. 5 (A) shows shape At the section of the flat die thread rolling roller 210z of the main part 52x and reference example of the base metal part 50x before threaded portion.The section is packet The section of the central axis (not shown) of the central axis CL and flat die thread rolling roller 210z of the 50x of part containing base metal.Master is only shown in the figure Being leaned on than central axis CL in the part and flat die thread rolling roller 210z of the side flat die thread rolling roller 210z in the main part 52x of body metalwork 50x A part of the side base metal part 50x.

Also explanation like that, is formed with contracting inside diameter 56 in the through hole 59 of base metal part 50x as shown in figure 1.Also, it is contracting The side front direction Df of inside diameter 56 is formed with the protrusion 59b of internal diameter constant, in the side front direction Df of protrusion 59b is formed with The diameter front hole portion 59c more slightly larger than protrusion 59b.The mesoporous of internal diameter constant is formed in the side rear direction Dfr of contracting inside diameter 56 Portion 59a.The internal diameter of middle hole portion 59a internal diameter more respective than front hole portion 59c, protrusion 59b is big.

Object part 57x in figure is the part that should form threaded portion in main part 52x.Object part 57x is therefrom The midway of hole portion 59a extends to the midway of front hole portion 59c.The outer diameter of object part 57x throughout object part 57x entirety and Constant.The wall thickness Tc of the wall thickness Ta wall thickness Tb than protrusion 59b and front hole portion 59c of the base metal part 50x of middle hole portion 59a It is all thin.In this way, object part 57x includes the first metalwork part 57xa that wall thickness is wall thickness Ta and the first wall thickness of wall ratio Ta thick Wall thickness Tb, Tc the second metalwork part 57xb.It should be noted that the second metalwork part 57xb is parallel with axis CL Direction the position part different with the first metalwork part 57xa.Moreover, wall thickness be the direction orthogonal with axis CL (that is, The linearly extended direction orthogonal with axis CL.Herein be radial) thickness.

Rolling portion 300z is equipped in the outer peripheral surface of the flat die thread rolling roller 210z of reference example.Rolling portion 300z have along with axis The spiral helicine tooth portion 310 and spiral helicine groove portion 320 that CL parallel direction extends.In the cross-sectional view of Fig. 5 (A), multiple teeth Portion 310 is with multiple groove portions 320 along the direction alternate repetition parallel with axis CL.In reference example, throughout rolling portion 300z's It is integrally arranged identical tooth portion 310 and identical groove portion 320.Here, rolling portion 300z is pressed on pair of base metal part 50x As part 57x, thus tooth portion 310 and groove portion 320 are in the object part 57x formation threaded portion of base metal part 50x.

Fig. 5 (B) shows section (the cutting comprising axis CL for being formed with the main part 52z of base metal part 50z of threaded portion Face).As shown, the outer peripheral surface in main part 52z is formed with threaded portion 57z.In the reference example of Fig. 5 (B), threaded portion is spread (Fig. 4 (F) of groove portion 420 for being integrally formed shape corresponding with the shape in tooth portion 310 of rolling portion 300z (Fig. 5 (A)) of 57z Deng).

Thickness T1, T2, T3 in figure are between the bottom 421 of groove portion 420 and the inner peripheral surface 59s of base metal part 50z Radial direction (that is, direction orthogonal with axis CL) thickness (also referred to as slot thickness T1, T2, T3).Here, the bottom 421 of groove portion 420 It is the part nearest with axis CL in the outer surface of groove portion 420.The slot thickness T1 of middle hole portion 59a it is T2 thicker than the slot of protrusion 59b and The slot thickness T3 of front hole portion 59c is thin.Threaded portion 57z includes that the first screw thread that slot thickness is slot thickness T1 forms part 57za and slot thickness rate Second screw thread of slot thickness T2, T3 of slot thickness T1 thickness forms part 57zb.It is parallel with axis CL that second screw thread, which forms part 57zb, Position and first screw thread in direction form the different part part 57za.In the reference example of Fig. 5 (B), the first screw thread is formed Part 57za corresponds to the first metalwork part 57xa of Fig. 5 (A), and the second screw thread forms the of part 57zb corresponding to Fig. 5 (A) Two metalwork part 57xb.

As shown, forming the groove portion 320 of part 57zb formation and rolling portion 300z (Fig. 5 (A)) in the second thick screw thread The corresponding shape of shape tooth portion 410 (Fig. 4 (F)).However, forming part 57za in the first thin screw thread is formed through figure The explanations such as 4 (E) have the tooth portion 410z of protrusion 430 and recess portion 440 at top.Its reason is as described below.

As shown in Fig. 5 (A), the object part of base metal part 50x is pressed in the rolling portion 300z of flat die thread rolling roller 210z In the case where 57x, the object part 57x of tubular is deformed due to the power from flat die thread rolling roller 210z.For example, object part 57x It is bent towards central axis CL.Object part 57x is towards central axis CL, that is, to the feelings of the Direction distortion separated with rolling portion 300z Under condition, the tooth portion 310 of rolling portion 300z is unable to fully engaging-in to object part 57x.As a result, can be formed shown in Fig. 4 (E) Such tooth portion 410z at top with protrusion 430 and recess portion 440.Small protrusion 430 due to other components (for example, Other metalworks) it contacts and is easily deformed.When protrusion 430 deforms, can generate the threaded portion 57z of base metal part 50z with A problem that increased friction between the internal screw thread of mounting hole etc..

Thin part of the deformation of object part 57x in object part 57x increases.For example, in the reference example of Fig. 5 (A) In, the first metalwork part 57xa is significantly deformed than the second metalwork part 57xb towards central axis CL.As a result, In the case that two metalwork part 57xb form tooth portion 410 appropriate, unsuitable tooth is formed in the first metalwork part 57xa Portion 410z.

By adjusting the condition of rolling, tooth portion 410 appropriate can be formed in the first metalwork part 57xa.For example, can To enhance the power that flat die thread rolling roller 210z is pressed on to base metal part 50x.Furthermore, it is possible to flat die thread rolling roller 210z is pressed on main body gold Extend the time for rotating flat die thread rolling roller 210z in the state of category part 50x.However, in the above cases, rolling portion 300z quilt It is pressed on the second metalwork part 57xb or rolling portion 300z too strongly and is pressed on the second metalwork part 57xb too longly.Its As a result, can generate a problem that the surface for the threaded portion that the second metalwork part 57xb is formed is cut.

In this way, can be generated not in the case where the object part 57x comprising the different multiple portions of wall thickness forms threaded portion Good situation.Therefore, in the present embodiment, to form low screw thread compared with the thicker part of wall thickness in the relatively thin part of wall thickness The mode of tooth constitutes flat die thread rolling roller 210,220 (Fig. 3).

A-4. the threaded portion of embodiment:

Fig. 6 is the skeleton diagram of flat die thread rolling roller with the embodiment for the threaded portion for being formed in base metal part.Fig. 6 (A) is shown Form the section of the main part 52x of the base metal part 50x before threaded portion and the flat die thread rolling roller 210 of embodiment.Diagram Section is the section comprising the central axis CL of base metal part 50x and the central axis (not shown) of flat die thread rolling roller 210.Base metal The structure of part 50x is identical as the structure of base metal part 50x of Fig. 5 (A).Interior direction Di in figure, which is directed towards with axis CL, is The direction of the radial inner circumferential side of the heart.Outside direction Do in figure is directed towards the direction of radial peripheral side.

It is different from the reference example of Fig. 5, in the rolling portion 300a of flat die thread rolling roller 210 to the first metalwork part 57xa shape Externally threaded second thread rolling portion is formed at externally threaded first thread rolling part 3aa and to the second metalwork part 57xb Divide between 3ab, the structure of groove portion is different.It is same as the reference example of Fig. 5 (A) in the second thread rolling part 3ab, it is equipped with tooth portion 310 and groove portion 320.On the other hand, in the first thread rolling part 3aa, replace groove portion 320 and be equipped with the slot more shallow than groove portion 320 Groove portion 350 (hereinafter, groove portion 320 is also referred to as deep trouth portion 320, is also referred to as shallow slot portion 350) by portion 350.First thread rolling portion Divide the tooth portion 310 of 3aa identical as the tooth portion 310 of the second thread rolling part 3ab.

Fig. 6 (B) shows section (the cutting comprising axis CL for being formed with the main part 52 of base metal part 50 of threaded portion 57 Face).In the present embodiment, corresponding with the shape in tooth portion 310 of rolling portion 300a throughout being integrally formed for threaded portion 57 The groove portion 420 (Fig. 4 (F) etc.) of shape.Slot thickness T1, T2, T3 in figure respectively with slot thickness T1, T2, T3 phase for illustrating in Fig. 5 (B) Together.Threaded portion 57 includes that the first screw thread that slot thickness is slot thickness T1 forms slot thickness T2, T3 of part 57a and slot thickness rate slot thickness T1 thickness Second screw thread forms part 57b.Second screw thread forms position and the first screw thread shape that part 57b is the direction parallel with axis CL At the different part part 57a.In the embodiment of Fig. 6 (B), the first screw thread forms the of part 57a corresponding to Fig. 6 (A) One metalwork part 57xa, the second screw thread form the second metalwork part 57xb that part 57b corresponds to Fig. 6 (A).

As shown, being formed in the second screw thread formation part 57b corresponding with the shape in deep trouth portion 320 of rolling portion 300a Shape tooth portion 410 (Fig. 4 (F)).Part 57a is formed in the first screw thread to be formed with and the shallow slot portion 350 of rolling portion 300a The tooth portion 450 of the corresponding shape of shape.As described later, tooth portion 450 is lower than tooth portion 410 (hereinafter, tooth portion 410 is also referred to as high tooth Tooth portion 450 is also referred to as low tooth portion 450 by portion 410).

Fig. 6 (C) is the cross-sectional view in the deep trouth portion 320 of the rolling portion 300a of flat die thread rolling roller 210, shallow slot portion 350, tooth portion 310. The part comprising deep trouth portion 320 in the section of rolling portion 300a shown in Fig. 6 (A) is shown in the figure and comprising shallow slot portion 350 The respective enlarged drawing in part.The structure in tooth portion 310 and deep trouth portion 320 respectively with tooth portion 310 shown in Fig. 4 (A) and groove portion 320 Structure it is identical.On the other hand, the bottom 351 in shallow slot portion 350 is located at the top that tooth portion 310 is leaned on than the bottom 321 in deep trouth portion 320 The position of 311 sides.

At squeezing thread portion, as Fig. 3 (B), rolling portion 300a is contacted with object part 57x.In this state, tooth The top 311 in portion 310 connects with the object part 57x of base metal part 50x.The straight line 57L of Fig. 6 (C) is by section The straight line at multiple tops 311 indicates the outer peripheral surface of the object part 57x to connect with multiple tops 311.The section of Fig. 6 (C) indicates In the state that for the rolling of threaded portion, the top 311 in tooth portion 310 connects with the object part 57x of base metal part 50x The section of axis CL (diagram is omitted) and the top 311 to connect with object part 57x of base metal part 50x.Direction in figure The side of the inner circumferential side of the direction radial direction centered on the central axis CL of base metal part 50x in the state of Di, Do expression in this way To with the direction towards peripheral side.The bottom 321 of groove portion 320 is the portion near the side outside direction Do in the outer surface of groove portion 320 Point.Equally, the bottom 351 of groove portion 350 is the part near the side outside direction Do in the outer surface of groove portion 350.Moreover, tooth portion 310 top 311 is the part of the side innermost direction Di in the outer surface in tooth portion 310.

The first depth D1 in figure is the depth of the bottom 351 from the top 311 in tooth portion 310 to shallow slot portion 350.Second is deep Degree D2 is the depth of the bottom 321 from the top 311 in tooth portion 310 to deep trouth portion 320.In the present embodiment, the first depth D1 It is smaller than the second depth D2.Above-mentioned depth D1, D2 be from the straight line 57L by multiple tops 311 on section to bottom 351, The distance of 321 outside direction Do.That is, depth D1, D2 is the base metal to connect with multiple tops 311 in the section of Fig. 6 (C) The depth in the direction orthogonal with axis CL (diagram is omitted) of part 50x.It should be noted that the flat die thread rolling roller 210 of Fig. 6 (A) Section also shows that section identical with the section of Fig. 6 (C).

Fig. 6 (D) be the tooth portion 410 formed by the groove portion 320,350 of flat die thread rolling roller 210 (Fig. 6 (C)) and tooth portion 310, 450 and groove portion 420 cross-sectional view.Being shown in the section of threaded portion 57 shown in Fig. 6 (B) in the figure includes high tooth portion 410 Part and the respective enlarged drawing in part comprising low tooth portion 450.The structure of high tooth portion 410 and groove portion 420 respectively with Fig. 4 (F) institute The tooth portion 410 shown is identical with the structure of groove portion 420.On the other hand, the top 451 in low tooth portion 450 is located at the top than high tooth portion 410 Position of the portion 411 by 421 side of bottom of groove portion 420.

It should be noted that the bottom 421 of groove portion 420 is the portion of the side innermost direction Di in the outer surface of groove portion 420 Point.Bottom 421 is formed by the top 311 in the tooth portion 310 of flat die thread rolling roller 210 (Fig. 6 (C)).Moreover, the top 411 in high tooth portion 410 It is the part near the side outside direction Do in the outer surface in high tooth portion 410.The top 411 in high tooth portion 410 is by flat die thread rolling roller 210 The bottom 321 in deep trouth portion 320 is formed.Equally, the top 451 in low tooth portion 450 is in the outer surface in low tooth portion 450 near foreign side To the part of the side Do.The top 451 in low tooth portion 450 is formed by the bottom 351 in the shallow slot portion 350 of flat die thread rolling roller 210.

The first height Ha in figure is the height from the bottom of groove portion 420 421 to the top 451 in low tooth portion 450.Second is high Degree Hb is the height from the bottom of groove portion 420 421 to the top 411 in high tooth portion 410.In the present embodiment, the first height Ha It is smaller than the second height Hb.Above-mentioned height Ha, Hb is the height in the direction orthogonal with the axis CL of base metal part 50.Moreover, First height Ha is roughly the same with the first depth D1 (Fig. 6 (C)), and the second height Hb is roughly the same with the second depth D2.In this way, figure Depth D1, D2 of 6 (C) is equivalent to height Ha, Hb of the thread of threaded portion.

In the present embodiment, also same as the reference example of Fig. 5 (A), by the rolling portion of flat die thread rolling roller 210 (Fig. 6 (A)) In the case that 300a is pressed on the object part 57x of base metal part 50x, (the first especially thin metalwork portion object part 57x Divide 57xa) it is bent towards central axis CL.Therefore, the tooth portion 310 of flat die thread rolling roller 210 to the engaging-in of the first metalwork part 57xa Measure the engaging-in amount to the second metalwork part 57xb sometimes less than tooth portion 310.Here, as illustrated that in Fig. 6 (A), Fig. 6 (C) Sample, the of the deep trouth portion 320 of the depth D1 than the second thread rolling part 3ab in the shallow slot portion 350 of the first thread rolling part 3aa Two depth D2 are small.Therefore, the part (part for being equivalent to the protrusion 430 of Fig. 4 (E) etc.) of the protuberance of the first metalwork part 57xa It can be accessible to the bottom 351 of shallow slot portion 350 (Fig. 6 (C)).As a result, the first metalwork part 57xa it is easy to form with it is shallow The low tooth portion 450 of the corresponding shape of the shape of groove portion 350.Moreover, the second thick metalwork part 57xb and the first thin metal Part part 57xa is compared and is difficult to bend.Therefore, easy to form corresponding with the shape in deep trouth portion 320 in the second metalwork part 57xb Shape high tooth portion 410.In this way, in the present embodiment, the tooth portion 450 and the of part 57a is formed in the first screw thread respectively Two screw threads are formed in the tooth portion 410 of part 57b, and the formation of recess portion small as the recess portion 440 of Fig. 4 (E) can be inhibited.

It should be noted that in the present embodiment, first screw thread of threaded portion 57 (Fig. 6 (B)) formed part 57a with Second screw thread is formed between the 57b of part, and the height of thread is different.But the first screw thread forms part 57a and the second screw thread shape Mutually different a part of 1 continuous threaded portion 57 (that is, 1 continuous external screw thread) is respectively formed at part 57b.Cause This forms part 57a in the first screw thread and the second screw thread is formed between the 57b of part, and the spacing of screw thread is identical, moreover, thread Angle it is also identical.

It should be noted that Fig. 6 (A), the deep trouth portion 320 of Fig. 6 (C) and shallow slot portion 350 pass through in 210 (Fig. 3 of flat die thread rolling roller (A), Fig. 3 (B)) outer peripheral surface 210s formed spiral helicine 1 slot around central axis 210c formed.The depth of the slot is first It is different between thread rolling part 3aa and the second thread rolling part 3ab.The depth of slot is preferably in the first thread rolling part The junction section (for example, part corresponding with contracting inside diameter 56) of 3aa and the second thread rolling part 3ab is smoothly varying.? In this case, the thread depth of the thread of the threaded portion 57 of base metal part 50 forms part 57a and second in the first screw thread Screw thread forms smoothly varying between the 57b of part.But the depth of the slot of flat die thread rolling roller 210 can also change steppedly. In this case, the thread depth of the thread of the threaded portion 57 of base metal part 50 forms part 57a and the in the first screw thread Two screw threads form between the 57b of part and change steppedly.Moreover, in the present embodiment, in the formation of threaded portion, main body Metalwork 50x is rotated 1 week with the state that contacts with the rolling portion 300a of flat die thread rolling roller 210 around rolling portion 300a or more.That is, rubbing spiral shell with the hands The outer peripheral surface 210s (that is, rolling portion 300a) of line roller 210 throughout complete cycle forms threaded portion in base metal part 50x.But The only a part that can be in the complete cycle of the rolling portion 300a of flat die thread rolling roller 210 forms threaded portion in base metal part 50x.At this In the case of, rolling portion 300a can only be formed in a part in the complete cycle of the outer peripheral surface 210s of flat die thread rolling roller 210.

It this concludes the description of the structure of flat die thread rolling roller 210.The structure of second flat die thread rolling roller 220 also with the first flat die thread rolling roller 210 Structure it is identical.

As previously discussed, in the present embodiment, as shown in Fig. 6 (A), the base metal part 50x before threaded portion is formed Formation threaded portion object part 57x include the first metalwork part 57xa and the second metalwork part 57xb.First metal The range of the position in the direction parallel with axis CL of part part 57xa is a part of range in the gamut of object part 57x Part.In first metalwork part 57xa, the wall thickness in the direction orthogonal with axis CL is the first wall thickness Ta.Second metal Part part 57xb is the position and the different part the first metalwork part 57xa in the direction parallel from axis CL.Second metalwork Wall thickness Tb, Tc of part 57xb is thicker than the wall thickness Ta of the first metalwork part 57xa.

Also, the rolling portion 300a of flat die thread rolling roller 210 includes externally threaded for being formed to the first metalwork part 57xa First thread rolling part 3aa and for forming externally threaded second thread rolling part 3ab to the second metalwork part 57xb. In the first thread rolling part 3aa, as explanation in Fig. 6 (C), from the top 311 in tooth portion 310 to the bottom of groove portion 350 351 depth is the first depth D1.In the second thread rolling part 3ab, from the top 311 in tooth portion 310 to the bottom of groove portion 320 The depth in portion 321 is the second depth D2.Also, the first depth D1 of the first thread rolling part 3aa is than the second thread rolling portion Divide the second depth D2 of 3ab small.Therefore, thread (the tooth portion that should be formed by the groove portion 350 of the first thread rolling part 3aa The amount of material needed for the formation of 450 (Fig. 6 (D)) is than the screw thread that the groove portion 320 by the second thread rolling part 3ab should be formed (amount of material needed for the formation of tooth portion 410 (Fig. 6 (D)) is few for tooth.That is, thread (the tooth portion of the first metalwork part 57xa Thread of the amount of material needed for the formation of 450 (Fig. 6 (D)) than the second metalwork part 57xb be (tooth portion 410 (Fig. 6 (D's)) The amount of material needed for being formed is few.Therefore, in the formation of threaded portion 57, even if the first metalwork portion in object part 57x 57xa is divided to bend than the second metalwork part 57xb, the first thread rolling part 3aa also can be in the first metalwork part 57xa It is properly formed external screw thread, also, the second thread rolling part 3ab can be also properly formed in the second metalwork part 57xb External screw thread.

In addition, in the present embodiment, in the first thread rolling part 3aa of flat die thread rolling roller 210 and the second thread rolling Between the 3ab of part, the structure of groove portion 350,320 is different.Therefore, the first metalwork part 57xa of base metal part 50x with The condition of rolling can not be changed between second metalwork part 57xb (for example, by the intensity of the tight power of flat die thread rolling roll-in, will rub with the hands The length etc. for the time that thread roller compresses).Furthermore, it is possible to not have to the formation of the threaded portion of the first metalwork part 57xa and the The formation of the threaded portion of two metalwork part 57xb is divided into different processes.That is, using flat die thread rolling roller 210, it can be to the first gold medal Belong to part part 57xa and the second metalwork part 57xb and is formed simultaneously threaded portion.

In addition, in the present embodiment, as shown in Fig. 6 (C), the bottom 351 in shallow slot portion 350 and the bottom in deep trouth portion 320 321 are rounded off respectively.Fig. 6 (C) shows the first curvature radius R1 and depth of the bottom 351 in the shallow slot portion 350 in the section of Fig. 6 (C) The second curvature radius R2 of the bottom 321 of groove portion 320.As shown, first curvature radius R1 is bigger than second curvature radius R2.Cause This can be properly formed external screw thread and the second metalwork part of the first metalwork part 57xa using flat die thread rolling roller 210 The external screw thread of 57xb.Moreover, can easily prepare the flat die thread rolling roller 210 with shallow slot portion 350 and deep trouth portion 320.

It should be noted that the structure of the second flat die thread rolling roller 220 is also identical as the structure of the first flat die thread rolling roller 210.Therefore, It, can be to the first metalwork part 57xa and the second metalwork by using the first flat die thread rolling roller 210 and the second flat die thread rolling roller 220 Part 57xb is properly formed external screw thread.

In addition, as described in explanation in Fig. 2, Fig. 3, Fig. 6, it is first in the case where base metal part 50x forms threaded portion 57 First, the first thread rolling part 3aa of the rolling portion 300a of flat die thread rolling roller 210 is pressed on to the first metal of base metal part 50x Second thread rolling part 3ab is pressed on second metalwork part 57xb (Fig. 2: S100, Fig. 3 (A), Fig. 3 by part part 57xa (B)).Rolling portion 300b about the second flat die thread rolling roller 220 is also the same.Also, by the rolling portion of flat die thread rolling roller 210,220 The corresponding part of 300a, 300b are pressed in the state of metalwork part 57xa, 57xb, and base metal part 50x is along flat die thread rolling Rolling portion 300a, 300b relative rotation (Fig. 2: S110, Fig. 3 (C), Fig. 3 (D)) of roller 210,220.As a result, in each metalwork portion 57xa, 57xb is divided to be properly formed external screw thread.

In addition, the threaded portion 57 of base metal part 50 includes that the first screw thread forms part 57a and second as shown in Fig. 6 (B) Screw thread forms part 57b.The range that first screw thread forms the position in the direction parallel with axis CL of part 57a is threaded portion 57 Gamut in a part of range part.It is formed in the 57a of part in first screw thread, the bottom of externally threaded groove portion 420 The thickness in the direction vertical with axis CL between 421 and the inner peripheral surface 59s of base metal part 50, that is, slot thickness is the first slot thickness T1. Second screw thread forms the position that part 57b is the direction parallel from axis CL and the first screw thread forms the different part part 57a. Slot thickness T2, T3 that second screw thread forms part 57b is T1 thick thicker than the slot that the first screw thread forms part 57a.

Also, as shown in Fig. 6 (D), formed in the 57a of part in the first screw thread, from the bottom of groove portion 420 421 to tooth portion 450 Top 451 height, that is, thread depth be the first height Ha.Moreover, being formed in the 57b of part in the second screw thread, from groove portion 420 Bottom 421 to tooth portion 410 top 411 thread depth be the second height Hb.Also, the first screw thread forms part 57a's First height Ha is smaller than the second height Hb that the second screw thread forms part 57b.

According to this structure, the first screw thread forms the thread of part 57a (needed for the formation of low tooth portion 450 (Fig. 6 (D)) The amount of material forms the thread (amount of material needed for the formation of high tooth portion 410 (Fig. 6 (D)) of part 57b than the second screw thread It is few.Therefore, in the formation of threaded portion 57, even if the first metalwork part 57xa (Fig. 6 (A)) second metalwork part 57xb of ratio In the case where flexure, by using the flat die thread rolling roller with the different groove portion of depth (for example, Fig. 6's (A) has shallow slot portion 350 With the flat die thread rolling roller 210 in deep trouth portion 320), it can also be properly formed external screw thread and thickness that the first thin screw thread forms part 57a The second screw thread formed part 57b external screw thread.

In addition, in the present embodiment, as shown in Fig. 6 (D), the top 451 in low tooth portion 450 and the top in the portion Gao Ya 410 411 are rounded off respectively.Fig. 6 (D) show the top 451 in the low tooth portion 450 in the section of Fig. 6 (D) first curvature radius Ra and The second curvature radius Rb at the top 411 in high tooth portion 410.As shown, first curvature radius Ra is bigger than second curvature radius Rb. Therefore, by adjusting the bottom of the groove portion for the flat die thread rolling roller for being used to form low tooth portion 450 radius of curvature (for example, Fig. 6 (C) The first curvature radius R1 of the bottom 351 in shallow slot portion 350) and be used to form high tooth portion 410 flat die thread rolling roller groove portion bottom Radius of curvature (for example, second curvature radius R2 of the bottom 321 in the deep trouth portion 320 of Fig. 6 (C)), can be properly formed thin The first screw thread form the external screw thread of part 57a and the second thick screw thread forms the external screw thread of part 57b.

It should be noted that the shallow slot of the first curvature radius Ra at the top 451 in low tooth portion 450 and the low tooth portion 450 of formation The first curvature radius R1 of the bottom 351 in portion 350 (Fig. 6 (C)) is roughly the same.Moreover, the second of the top 411 in high tooth portion 410 The second curvature radius R2 substantially phase of radius of curvature R b and the bottom 321 in the deep trouth portion 320 (Fig. 6 (C)) for forming high tooth portion 410 Together.

B. variation:

(1) structure as flat die thread rolling roller can replace the structure of the flat die thread rolling roller illustrated in Fig. 6 etc. 210,220 and adopt With other various structures.For example, in the section of Fig. 6 (C), the bottom 321,351 of groove portion 320,350 can not be rounded off and For V shape.Moreover, bottom 321,351 may include flat part (for example, flat die thread rolling roller contacted with base metal part 50x and Form the part parallel with axis CL of the base metal part 50x of the state of threaded portion).

In addition, in the section of Fig. 6 (C), the top 311 in tooth portion 310 is rounded off in the embodiment of Fig. 6 (C).? It can be replaced in this, the angle of V shape is formed on top 311.Moreover, top 311 may include flat part (for example, flat die thread rolling Roller contacts and is formed the part parallel with axis CL of the base metal part 50x of the state of threaded portion with base metal part 50x).

In addition, flat die thread rolling roller can be the mold of tubular as the flat die thread rolling roller 210,220 for replacing Fig. 3 and be flat die thread rolling The various flat die thread rolling rollers such as plate, planet mold.Moreover, using the mold of tubular, it can be by by 3 molds or 5 A mold (usually 2 or more molds) compresses to base metal part 50x and forms threaded portion.

In general, flat die thread rolling roller has rolling portion, which includes the groove portion and use for being used to form externally threaded thread In the tooth portion for forming externally threaded thread groove.Also, it, can be using the thin part shape to metalwork as the structure in rolling portion It is less than at the depth of the groove portion of externally threaded first thread rolling part and externally threaded second is formed to the thick part of metalwork Various structures as the depth of the groove portion of thread rolling part.No matter what kind of situation it is, flat die thread rolling roller by cutting, grinding, The various methods such as forging can manufacture.

(2) structure as the threaded portion of metalwork can replace the structure of the threaded portion illustrated in Fig. 6 etc. 57 and use Other various structures.For example, the top 411,451 in tooth portion 410,450 can be rounded off and shape in the section of Fig. 6 (D) At the angle of V shape.Moreover, top 411,451 may include flat part (for example, part parallel with axis CL).

In addition, in the section of Fig. 6 (D), the bottom 421 of groove portion 420 is rounded off in the embodiment of Fig. 6 (D).It takes In generation, bottom 421 can be V shape in this.Moreover, bottom 421 may include flat part (for example, parallel with axis CL Part).

In addition, threaded portion can replace a screw thread and be two screw threads.One screw thread is by spiral helicine 1 thread The screw thread constituted with spiral helicine 1 thread groove, two screw threads are by spiral helicine 2 threads and spiral helicine 2 screw threads The screw thread that slot is constituted.In general, threaded portion can be by spiral helicine N item (integer that N is 1 or more) thread and spiral helicine N The N screw thread that thread groove is constituted.The rolling portion of flat die thread rolling roller is to form spiral helicine N thread and spiral helicine N spiral shell The mode of groove is constituted.

Part and thick the second screw thread formation part are formed (for example, Fig. 6 (B) institute usually as comprising the first thin screw thread Thick the first small screw thread of the slot that shows forms part 57a and thick the second big screw thread of slot forms part 57b) threaded portion structure, The thread depth at the top in bottom to the tooth portion of the slave groove portion of part can be formed using the first screw thread than the second screw thread forming portion The small such various structures of the thread depth divided.If the structure using such structure as 1 continuous threaded portion, leads to The external screw thread and thick second that the first thin screw thread forms part can be properly formed using above-mentioned various flat die thread rolling rollers by crossing The external screw thread of screw thread formation part.

It should be noted that the second thick screw thread, which forms part, can be the portion being partially separated with the first thin screw thread formation Point, this can also be replaced in but form the part that part is connect with the first thin screw thread.In either case, for general The threaded portion of metalwork is appropriately mounted at the internal screw thread of mounting hole, forms part and the second thick screw thread in the first thin screw thread Between forming portion point, the paddy diameter of screw thread is all preferably roughly the same.Also, part is formed as the first thin screw thread, can be used The internal diameter part bigger than thick the second screw thread formation part.

(3) as to metalwork formed threaded portion method, can replace Fig. 2, method illustrated in fig. 3 and use it is various Method.For example, the beginning of the rotation of flat die thread rolling roller 210,220 is (that is, base metal part 50x is relative to flat die thread rolling roller 210,220 The beginning of relative rotation) can be by flat die thread rolling roller 210,220 to base metal part 50x compress before, be also possible to that spiral shell will be rubbed with the hands After line roller 210,220 is compressed to base metal part 50x.

(4) metalwork with threaded portion can replace spark plug 100 base metal part 50 but other various dresses The metalwork for the tubular set.For example, in the dynamical system with internal combustion engine (for example, including internal combustion engine, air inlet pipe, exhaust pipe System) installation the tubular of devices such as spark plug, glow plug, gas sensor (for example, oxygen concentration sensor) metal Above-mentioned threaded portion can be applicable in part.

More than, based on embodiment, variation and illustrate the present invention, but the embodiment of above-mentioned invention is to be used for Make the easy embodiment of understanding of the invention, is not to limit the present invention.The present invention is not departing from its purport and claim The range of book can be carried out change, improvement, and include its equivalent program in the present invention.

Description of symbols

8... after front end side gasket, 10... insulator, 11... contracting inside diameter, 12... through hole (axis hole), 13... End side main part, 14... large-diameter portion, the front end side 15... main part, 16... contracting outer diameter part, the leg 19..., electrocardio in 20... Pole, 21... outer layer, 22... core, 23... lip portions, the head 24..., 27... axle portion, 28... stick portion, 29... first end Head, 30... grounding electrode, 31... outer layer, 32... internal layer, 33... base end part, the front end 34..., 37... main part, 39... the second end, 40... terminal metal piece, 41... axle portion, 48... lip portions, 49... cap department of assembly, 50,50x, 50z... base metal part, 51... tool engagement portion, 52,52x, 52z... main part, 53... rivet tightly portion, 54... lip portions, 55... front end face, 56... contracting inside diameter, 57, the threaded portion 57z..., the first screw thread of 57a... form part, the second spiral shell of 57b... Line forms part, 57x... object part, the first metalwork of 57xa... part, the second metalwork of 57xb... part, 57za... First screw thread forms part, the second screw thread of 57zb... forms part, 58... buckles portion, 59... through hole, 59a... mesoporous Portion, 59b... protrusion, 59c... front hole portion, 59s... inner peripheral surface, 61... ring element, 70... talcum, 72... first are sealed Portion, 73... resistor body, the second sealing of 74..., 90... liner, 100... spark plug, the first flat die thread rolling of 210... roller, 210c... central axis, 210s... outer peripheral surface, the second flat die thread rolling of 220... roller, 220c... central axis, 220s... outer peripheral surface, 210z... flat die thread rolling roller, 300a, 300b, 300x, 300z... rolling portion, the first thread rolling of 3aa... part, 3ab... Two thread rolling parts, 310... tooth portion, the top 311..., 320... deep trouth portion, the bottom 321..., 350... shallow slot portion, 351... bottom, 400... workpiece, 410... high tooth portion, the top 411..., 410z... tooth portion, 420... groove portion, the bottom 421... Portion, the protrusion 430..., 440... recess portion, the low tooth portion 450..., the top 451..., the surface 490..., the interval g..., in CL... Extreme direction (rear direction) after extreme direction (front direction), Dfr... before mandrel (axis), Df....

Claims

1. a kind of metalwork is the metalwork of the tubular extended along the direction of axis, wherein

The metalwork, which has, to be formed in outer peripheral surface along the externally threaded part i.e. threaded portion of the direction of axis extension,

The threaded portion includes:

First screw thread forms part, is the part of a part of range in the gamut of the threaded portion；And

Second screw thread forms part, and the position in the direction of the axis forms partially different and described from first screw thread Described in thickness, that is, slot thickness rate with the direction of the axis vertical take-off between externally threaded slot bottom and the inner peripheral surface of the metalwork The slot that first screw thread is formed at part is thick,

First screw thread forms height, that is, thread depth from the externally threaded slot bottom to crest at part than described the The thread depth that two screw threads are formed at part is small.

2. metalwork according to claim 1, wherein

The radius of curvature that first screw thread forms the externally threaded crest of part forms part than second screw thread The radius of curvature of the externally threaded crest is big.

3. a kind of flat die thread rolling roller, the periphery of the first metalwork part for the metalwork in the tubular extended along the direction of axis The position in face and the direction of axis thickness different and with the direction of the axis vertical take-off from the first metalwork part It is formed on the outer peripheral surface of second metalwork part of the wall thickness thickness i.e. at the first metalwork part described in wall ratio by rolling The external screw thread extended along the direction of the axis, wherein

The flat die thread rolling roller has rolling portion, and the rolling portion includes the groove portion and use for being used to form the externally threaded thread In the tooth portion for forming the externally threaded thread groove,

In the rolling portion to first metalwork part formed at the externally threaded first thread rolling part from Depth, that is, groove depth of the top in the tooth portion to the bottom of the groove portion than in the rolling portion to second metalwork The groove depth that part is formed at the externally threaded second thread rolling part is small.

4. flat die thread rolling roller according to claim 3, wherein

Institute of the radius of curvature of the bottom of the groove portion of first thread rolling part than second thread rolling part The radius of curvature for stating the bottom of groove portion is big.

5. a kind of forming method is formed in the outer peripheral surface of the metalwork of the tubular extended along the direction of axis along the side of the axis To the external screw thread of extension, wherein

The formation of the metalwork externally threaded part includes:

First metalwork part is the part of a part of range in the gamut for be formed the externally threaded part；And

Second metalwork part, the position in the direction of the axis is different from first metalwork part, and with the axis Wall thickness at first metalwork part described in the thickness, that is, wall ratio in the orthogonal direction of line is thick,

The forming method includes:

First thread rolling part of flat die thread rolling roller described in claim 3 or 4 is pressed on described the of the metalwork Second thread rolling part of the flat die thread rolling roller is pressed on second metal of the metalwork by one metalwork part Part part；And

First metalwork part and second thread rolling part is pressed in first thread rolling part to be pressed In the state of second metalwork part, make the metalwork along the opposite rotation in the rolling portion of the flat die thread rolling roller Turn, thus forms the external screw thread in first metalwork part and second metalwork part.