CN105408641A - Metal plate with tapped hole, frame, and method for manufacturing metal plate with tapped hole - Google Patents

Metal plate with tapped hole, frame, and method for manufacturing metal plate with tapped hole Download PDF

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Publication number
CN105408641A
CN105408641A CN201480019744.6A CN201480019744A CN105408641A CN 105408641 A CN105408641 A CN 105408641A CN 201480019744 A CN201480019744 A CN 201480019744A CN 105408641 A CN105408641 A CN 105408641A
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CN
China
Prior art keywords
sheet metal
wall part
wall portions
threaded hole
outside wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201480019744.6A
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Chinese (zh)
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CN105408641B (en
Inventor
濑户厚司
三日月丰
浜田幸一
樱田荣作
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Nippon Steel Corp
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Nippon Steel Corp
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Publication of CN105408641A publication Critical patent/CN105408641A/en
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Publication of CN105408641B publication Critical patent/CN105408641B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/24—Making other particular articles nuts or like thread-engaging members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B21D19/10—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws working inwardly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/02—Nuts or like thread-engaging members made of thin sheet material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
    • F16B37/122—Threaded inserts, e.g. "rampa bolts"

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Plates (AREA)
  • Punching Or Piercing (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Finishing Walls (AREA)
  • Domestic Plumbing Installations (AREA)
  • Door And Window Frames Mounted To Openings (AREA)
  • Forging (AREA)

Abstract

In the metal plate with a tapped hole, the tapped hole is provided with a cylindrical outer wall section that rises from one surface of the metal plate and a cylindrical inner wall section, which is folded back from the edge of the outer wall section on the inside of the outer wall section. A female screw is formed on the inner circumferential surface of the inner wall section.

Description

The manufacture method of sheet metal with threaded hole, housing and sheet metal with threaded hole
Technical field
The present invention relates to the manufacture method of sheet metal with threaded hole, housing and sheet metal with threaded hole.More specifically, even if relate to tapped hole also excellent with the fastening force of screw with external thread when having had at thin-walled property and also can prevent the sheet metal with threaded hole of this tapped hole breakage, possess the housing of this sheet metal with threaded hole and the manufacture method of above-mentioned sheet metal with threaded hole.
The application based on the Patent 2013-154105 CLAIM OF PRIORITY proposed in Japan on July 25th, 2013, by its content quotation so far.
Background technique
The outdoor unit of air-conditioning and the many employings of the housing of converting equipment are processed to the sheet metal of various shape by cut-out processing and/or bending.Widely use thread structure at this sheet metal and formation other sheet metals of housing and/or the mounting portion of appurtenances, therefore sometimes will manufacture tapped hole on a metal plate.
Figure 11 is the figure schematically showing the tapped hole that sheet metal in the past has, and is also longitudinal section when observing in the cross section of the central axis comprising tapped hole.The sheet metal 510 with tapped hole shown in this figure, in order to make this structure easy to understand, also showing screw with external thread (male ね じ) 550 with imaginary line and having the another sheet metal 551 of through hole 551a.Sheet metal 510 shown in this figure has the longitudinal wall part 511 (following, sometimes this longitudinal wall part 511 to be called tapped hole 511) of the cylindrical shape playing tapped hole effect.One end of longitudinal wall part 511 is continuous with main body 513 phase of sheet metal, is formed with internal thread 511b at the inner peripheral surface of this longitudinal wall part 511.By superimposed for the sheet metal 551 with through hole 551a be installed on this sheet metal 510 time, by screw with external thread 550 being inserted through hole 551a and being screwed in tapped hole 511 and making it combine.This tapped hole 511 can use flange (burring) to be processed to form in sheet metal, because this processing is the easiest, therefore mostly uses this processing.
Figure 12 A and Figure 12 B is the longitudinal section of an example of the manufacturing procedure of the tapped hole schematically shown on sheet metal in the past, and Figure 12 A represents punch out step, and Figure 12 B represents flange step in addition.When thread mill drilling 511, first on the sheet metal 520 of processing object, get bottom outlet.The punching of bottom outlet can be undertaken by shearing and/or cutting.When getting bottom outlet by shearing, such as, use the drift 531 of punching as illustrated in fig. 12 and the punch die 532 of punching.By making drift 531 relative with punch die 532 close, thus a part for sheet metal 520 is pressed in the through hole of punch die 532 together with drift 531.Its result, by utilizing the cutter being arranged at drift 531 and punch die 532 respectively a part for sheet metal 520 to be cut and to make it to be separated, thus gets bottom outlet.
Being equipped with the sheet metal 520 of bottom outlet, shaped the stretch flange formability becoming longitudinal wall part by flange.As shown in Figure 12 B, in flange processing, the drift 533 of flange, the punch die 534 of flange and holding pad (blankholder) 539 is used.In flange processing, under the state that hold sheet metal 520 by punch die 534 and holding pad 539, make drift 533 and punch die 534 and holding pad 539 to move relative to close mode, the peripheral part of the bottom outlet of sheet metal 520 is pressed in the recess of punch die 534 together with drift 533.Its result, the peripheral part of the bottom outlet of sheet metal 520 extends to the pressing direction of drift 533, and side by side also radially expand, its result, be shaped cylindric stretch flange formability and longitudinal wall part 511.
By using such as screw tap (not shown) being configured as the inner peripheral surface machining internal thread 511b of longitudinal wall part 511 of such cylindrical shape, tapped hole 511 can be produced on sheet metal 520 thus.
About the tapped hole of sheet metal, as shown in such as patent documentation 1, proposed various motion in the past.The housing that patent documentation 1 proposes, the 2nd sheet metal member in its component parts is formed with tapped hole.The tapped hole of the 2nd sheet metal member has the 1st plat part and the 2nd plat part, and the 1st plat part and the 2nd plat part are formed as relative configuration opposite to one another by the ora terminalis of sheet metal member by turning back.The tapped hole of the 2nd sheet metal member also has: the 1st cylindrical part, and it protrudes cylindrical shape from the 1st plat part and have screwing part at inner peripheral surface; With the 2nd cylindrical part, it protrudes cylindrical shape from the 2nd plat part and has screwing part at inner peripheral surface, with the 1st cylindrical part roughly serial arrangement.Can say, according to the 2nd sheet metal member, because internal thread to be formed at the inner peripheral surface of the 1st cylindrical part and the 2nd cylindrical part as screwing part, so the axial dimension that contacts with screw outside thread can be made elongated and guarantee fastening torque.
In addition, Patent Document 2 discloses following structure: by by be formed the 1st cylindrical portion the 1st thin plate and after being formed with that the 2nd thin plate of the 2nd cylindrical portion is superimposed and making to embed the 1st cylindrical portion coaxially in described 2nd cylindrical portion, make tapping screw be screwed together in the inner peripheral surface of the 1st cylindrical portion from the 2nd thin plate side, make the 2nd thin plate fastening relative to the 1st thin plate thus.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2011-214802 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2012-241839 publication
Summary of the invention
The problem that invention will solve
In the tapped hole of the such sheet metal 510 in the past shown in Figure 11, be formed with internal thread 511b at the inner peripheral surface of the longitudinal wall part shaped by flange (stretch flange formability) 511.As such by the tapped hole 511 of flange manufacturing, with the thin-walled property for the light-weighted sheet metal of pursuit of household appliances and/or automobile component etc., reduce with the fastening force of screw with external thread.In addition, the state that the worm tooth of the worm tooth and screw with external thread 550 that yet there is tapped hole 511 does not engage because of the distortion of tapped hole 511, the i.e. situation of tapped hole 511 breakage.
In addition, in above-mentioned patent documentation 1, propose following structure as tapped hole: there is the 1st plat part opposite each other and the 2nd plat part, the cylindrical part with screwing part is set respectively at the 1st plat part and the 2nd plat part.Can say, according to this structure, the axial dimension of the internal thread contacted with screw with external thread can be made elongated and guarantee fastening torque.Need when forming this tapped hole: carry out flange processing be equipped with bottom outlet on the 1st plat part after and cylindrical part is set, and after the 2nd plat part is equipped with bottom outlet, carries out flange processing cylindrical part is set, carrying out afterwards turns back makes the 1st plat part overlapping with the 2nd plat part, further machining internal thread.Like this, processing needs 6 steps, machining period significantly increases.In addition, carry out turning back make the 1st plat part overlapping with the 2nd plat part time, need to make the center of 2 cylindrical part consistent with each other, require high bending precision.Thus, then there is processing cost and significantly to rise this problem in the tapped hole that patent documentation 1 records if process on a metal plate.
And, in above-mentioned patent documentation 2, as its 0014 section record " to expand to radial direction foreign side owing to making the 1st cylindrical portion and make it be crimped on the 2nd cylindrical portion; thus thin plate each other non-loosening and fixed by threaded part securely ", eliminate the play between the 1st cylindrical portion and the 2nd cylindrical portion, seek thus to prevent the relative position deviation between the 1st thin plate and the 2nd thin plate.
In this configuration, if the difference in size of the external diameter of the internal diameter of the 2nd cylindrical portion and the 1st cylindrical portion is larger, even if then likely such as make the 1st cylindrical portion expand to radial direction foreign side, the 1st cylindrical portion also cannot be made to be crimped on the 2nd cylindrical portion fully, and its result cannot obtain above-mentioned effect.Thus, in order to obtain sufficient fastening force, be desirably in and reduce above-mentioned difference in size (play size) in a way, be embedded in the embedding operation change difficulty of the 1st cylindrical portion like this to the 2nd cylindrical portion, although be not sometimes also likely correctly fitted together to but tapping screw be screwed into by mistake.Under these circumstances, cannot fix between the 1st thin plate and the 2nd thin plate effectively natch.And this tapped hole usually not only arranges a place but arranges many, so can't deny, the probability that such operation error occurs is not low.Therefore, from the viewpoint of obtaining effectively, sufficient fastening force is such, even the structure of patent documentation 2 also may not be abundant.
The present invention makes in view of the foregoing, its object is to provide sheet metal with threaded hole, possess the manufacture method of the housing of this sheet metal with threaded hole and sheet metal with threaded hole, though this sheet metal with threaded hole can reduce processing cost rising and at thin-walled property tapped hole and the fastening force of screw with external thread still excellent and tapped hole can be prevented damaged.
For the technological scheme of dealing with problems
The present inventors, in order to solve the problem, to reduce the fastening force of the screw thread caused due to sheet metal thin-walled property in the past illustrated in fig. 11 and disrepair phenomenon is analyzed, and obtain the reason of following (a) ~ (d).
A (), in flange processing, there is wall thickness and reduce in the foundation part of longitudinal wall part 511 with the shaping of cylindric longitudinal wall part 511.In addition, so-called " foundation part ", as shown in the part that double dot dash line in Figure 11 is irised out, that refer to longitudinal wall part 511 with the consecutive part 511a of main body 513 that is sheet metal.
B () reduces and thinning foundation part, so produce the very thin position of wall thickness owing to thread groove being worked into wall thickness because of the wall thickness of above-mentioned (a).
Resiliently deformable occurs at c position that () this wall thickness is very thin thus fastening force reduces.In addition, screw with external thread 550 be screwed into (tightening) operation time produce plastic deformation at the position that wall thickness is very thin, and even there is the situation of situation fracture of tapped hole 511 breakage.
(d) screw with external thread 550 be screwed into operation and operation of loosening etc. time cylindrical shape longitudinal wall part 511 to the plastic deformation of expanding direction, the area that the worm tooth of tapped hole 511 abuts with the worm tooth of screw with external thread 550 sometimes reduces.In this case, and even also there is the situation that fastening force reduces tapped hole 511 breakage.
The basis of these phenomenons is attentively studied, result, the present inventors contemplate: outside wall portions tapped hole being configured to the cylindrical shape erected from sheet metal and the dual-layer wall of the inner wall part of cylindrical shape of turning back to the inside from this outside wall portions, form internal thread at the inner peripheral surface of inner wall part further.Thus, even if when being thinned the thickness of slab of sheet metal, the fastening force of tapped hole and screw with external thread is also excellent and also can prevent the breakage of tapped hole.
In addition, the present inventors contemplate: as the another way of tapped hole, even if be configured to, by this dual-layer wall of outside wall portions of the inner wall part of the cylindrical shape erected from sheet metal and the cylindrical shape of turning back laterally from this inner wall part, the structure forming internal thread further at the inner peripheral surface of inner wall part, also can obtain substantially same effect.
The present invention is based on above-mentioned cognition and complete, its summary is below shown.
(1) an embodiment of the invention relate to a kind of sheet metal with threaded hole, it is the sheet metal with tapped hole, wherein, the outside wall portions that described tapped hole possesses the cylindrical shape erected from a face of described sheet metal and the inner wall part of cylindrical shape of turning back to the inner side of described outside wall portions from the ora terminalis of described outside wall portions, internal thread is formed at the inner peripheral surface of described inner wall part.
(2) also passable, in the sheet metal with threaded hole described in above-mentioned (1), the top of described inner wall part and another face of described sheet metal coplanar.
(3) also passable, following structure is adopted: under the state of described internal thread that screw with external thread is not screwed together in described tapped hole in the sheet metal with threaded hole described in above-mentioned (1), the outer circumferential face of described inner wall part is separated from the inner peripheral surface of described outside wall portions, under the state of described internal thread that described screw with external thread is screwed together in described tapped hole, abutting with the described inner peripheral surface of described outside wall portions at least partially of the described outer circumferential face of described inner wall part.
(4) also passable, when the sheet metal with threaded hole described in above-mentioned (3), the top of described inner wall part and another face of described sheet metal coplanar.
(5) another embodiment of the present invention relates to a kind of sheet metal with threaded hole, it is the sheet metal with tapped hole, wherein, the inner wall part that described tapped hole possesses the cylindrical shape erected from a face of described sheet metal and the outside wall portions of cylindrical shape of turning back to the outside of described inner wall part from the ora terminalis of described inner wall part, be formed with internal thread at the inner peripheral surface of described inner wall part.
(6) another embodiment of the invention relates to a kind of housing, possess the sheet metal with tapped hole, the parts with through hole and screw with external thread, this screw with external thread is screwed into described tapped hole with the state inserting described through hole and is combined with the described parts with through hole by described sheet metal, the feature of described housing is, described sheet metal is the sheet metal with threaded hole according to any one of above-mentioned (1) ~ (5).
(7) another embodiment of the invention relates to a kind of method, manufacture the sheet metal with threaded hole according to any one of above-mentioned (1) ~ (4), wherein, have: the described outside wall portions that is shaped on described sheet metal and the step with consecutive plectane portion, the inner side of described outside wall portions; The step of bottom outlet is got at the center in described plectane portion; The described plectane portion being equipped with described bottom outlet is formed the step of inner wall part described in shape to lateral buckling in described outside wall portions; And the step of described internal thread is processed at the described inner peripheral surface of described inner wall part formed thereby.
(8) also passable, in the manufacture method of the sheet metal with threaded hole described in above-mentioned (7), the described sheet metal of thickness size t (mm) is shaped in the step in described outside wall portions and described plectane portion, use has the drift of the shoulder size of the radius R (mm) meeting following mathematical expression (a)
0.5≤R/t≤1.0 mathematical expression (a).
(9) also passable, in the manufacture method of the sheet metal with threaded hole described in above-mentioned (7), the described sheet metal of thickness size t (mm) is got in the step of described bottom outlet, getting described bottom outlet makes the radius r of described bottom outlet (mm) meet following mathematical expression (b)
0.5≤r/t≤1.2 mathematical expression (b).
(10) also passable, in the manufacture method of the sheet metal with threaded hole described in above-mentioned (7), the described sheet metal of thickness size t (mm) is shaped in the step in described outside wall portions and described plectane portion, use has the drift of the shoulder size of the radius R (mm) meeting following mathematical expression (a), described sheet metal is got in the step of described bottom outlet, getting described bottom outlet makes the radius r of described bottom outlet (mm) meet following mathematical expression (b)
0.5≤R/t≤1.0 mathematical expression (a)
0.5≤r/t≤1.2 mathematical expression (b).
(11) another mode of the present invention relates to a kind of method, manufactures the sheet metal with threaded hole according to any one of above-mentioned (1) ~ (4), and wherein, described method has: the punch out step getting bottom outlet on described sheet metal; To be shaped with one heart described outside wall portions and the step with consecutive plectane portion, the inner side of described outside wall portions with described bottom outlet; Described plectane portion is formed the step of inner wall part described in shape to lateral buckling in described outside wall portions; And the step of described internal thread is processed at the described inner peripheral surface of described inner wall part.
(12) also passable, in the manufacture method of the sheet metal with threaded hole described in above-mentioned (11), the described sheet metal of thickness size t (mm) is shaped in the step in described outside wall portions and described plectane portion, use has the drift of the shoulder size of the radius R (mm) meeting following mathematical expression (a)
0.5≤R/t≤1.0 mathematical expression (a).
(13) also passable, in the manufacture method of the sheet metal with threaded hole described in above-mentioned (11), the described sheet metal of thickness size t (mm) is got in the step of described bottom outlet, get described bottom outlet, the radius r (mm) forming the described bottom outlet after the step in described plectane portion is made to meet following mathematical expression (b)
0.5≤r/t≤1.2 mathematical expression (b).
(14) also passable, in the manufacture method of the sheet metal with threaded hole described in above-mentioned (11), the described sheet metal of thickness size t (mm) is shaped in the step in described outside wall portions and described plectane portion, use has the drift of the shoulder size of the radius R (mm) meeting following mathematical expression (a), described sheet metal is got in the step of described bottom outlet, getting described bottom outlet makes the radius r (mm) forming the described bottom outlet after the step in described plectane portion meet following mathematical expression (b)
0.5≤R/t≤1.0 mathematical expression (a)
0.5≤r/t≤1.2 mathematical expression (b).
The effect of invention
The sheet metal with threaded hole of an embodiment of the invention described in above-mentioned (1) ~ (4), possesses the double wall construction of the inner wall part having outside wall portions and turn back to the inside from this outside wall portions.According to this structure, when making screw with external thread be screwed together in the internal thread of inner wall part, inner wall part accepts the pressing force of screw with external thread and will expand to radial outside, but the outside wall portions be in around it supports, so the excessive deformation of inner wall part is restricted.Its result, can prevent the breakage of tapped hole and reduction that is excessively expanding due to inner wall part and the fastening force caused.
Further from the viewpoint of fastening force, the sprung back's effect produced during by having carried out formed machining being turned back to the inner side of outside wall portions by inner wall part, and be in constantly to inner wall part apply necking square to the state of elastic force.Its result, when screw with external thread being screwed into the internal thread of inner wall part, owing to being in the state that internal thread is constantly close to by pressing to screw with external thread, so can guarantee not produce loosening high fastening force.
Further from the viewpoint that breakage prevents, owing to not forming in the past existing internal thread in outside wall portions, so the situation of the foundation part of this outside wall portions thinning thus easily breakage further because internal thread is formed can be prevented.In addition, in the foundation part of inner wall part, although be formed with internal thread, be the double wall construction that covered by outside wall portions around it, thus not cracky.Like this, all high strength can be guaranteed, so breakage can be prevented at 2 place's bending parts of tapped hole.
As discussed above, sheet metal with threaded hole according to the present embodiment, even if its thickness of slab thinning, the fastening force of tapped hole and screw with external thread is also excellent and can prevent the breakage of tapped hole.
The sheet metal with threaded hole of the mode of execution according to above-mentioned (5), possesses the double wall construction of the outside wall portions having inner wall part and turn back laterally from this inner wall part.According to this structure, when making screw with external thread be screwed together in the internal thread of inner wall part, inner wall part accepts the pressing force of screw with external thread and will expand to radial outside, but the outside wall portions be in around it supports, so the excessive deformation of inner wall part is restricted.Its result, can prevent the breakage of tapped hole and reduction that is excessively expanding due to inner wall part and the fastening force caused.
The housing of the mode of execution described in above-mentioned (6), owing to possessing above-mentioned sheet metal with threaded hole, so the fastening force of tapped hole and screw with external thread is excellent and can prevent the breakage of tapped hole.Thus, can prevent be screwed into screw with external thread from loosening.
The manufacture method of the sheet metal with threaded hole of the mode of execution described in above-mentioned (7) ~ (14), as mentioned above, can process fastening force excellence on a metal plate and can prevent damaged tapped hole.And, the increase of machining period and processing cost can be reduced.
Accompanying drawing explanation
Fig. 1 is the figure of the tapped hole of the sheet metal with threaded hole schematically showing the 1st mode of execution of the present invention, is also longitudinal section when observing in the cross section of the central shaft comprising tapped hole.
Fig. 2 is the enlarged view in the A portion of Fig. 1, be also be screwed into tapping screw before figure.
Fig. 3 is the enlarged view in the A portion of Fig. 1, is also the figure after being screwed into tapping screw.
Fig. 4 is the exploded perspective view of the housing representing this mode of execution.
Fig. 5 A is the figure of the manufacture method of the sheet metal with threaded hole that this mode of execution is described, is also the sectional view of the outside wall portions forming step represented in work flow.
Fig. 5 B is the sectional view of the punch out step of the then outside wall portions forming step represented in this work flow.
Fig. 5 C is the sectional view of the inner wall part forming step of the then punch out step represented in this work flow.
Fig. 5 D is the sectional view of the internal thread forming step of the then inner wall part forming step represented in this work flow.
Fig. 6 A is the figure of the variation of the manufacture method of the sheet metal with threaded hole that this mode of execution is described, is also the sectional view of the punch out step represented in work flow.
Fig. 6 B is the sectional view of the outside wall portions forming step of the then punch out step represented in the work flow of this variation.
Fig. 6 C is the sectional view of the inner wall part forming step of the then outside wall portions forming step represented in the work flow of this variation.
Fig. 6 D is the sectional view of the internal thread forming step of the then inner wall part forming step represented in the work flow of this variation.
Fig. 7 is the figure of the tapped hole of the sheet metal with threaded hole schematically showing the 2nd mode of execution of the present invention, is also longitudinal section when observing in the cross section of the central axis comprising tapped hole.
Fig. 8 is the figure of the tapped hole of the sheet metal with threaded hole schematically showing the 3rd mode of execution of the present invention, is also longitudinal section when observing in the cross section of the central axis comprising tapped hole.
Fig. 9 is the figure of the tapped hole of the sheet metal with threaded hole schematically showing the 4th mode of execution of the present invention, is also longitudinal section when observing in the cross section of the central axis comprising tapped hole.
Figure 10 be represent in the test of the fastening force evaluating tapped hole, the figure of the relation of the externally threaded angle of rotation of screw and the relation of fastening torque and the change ratio of the externally threaded angle of rotation of screw and fastening torque.
Figure 11 is the sectional view of the tapped hole of the sheet metal with threaded hole schematically shown in the past.
Figure 12 A is the figure of an example of the work flow of the tapped hole of the sheet metal with threaded hole illustrated in the past, is also the sectional view of the punch out step represented in this work flow.
Figure 12 B is the sectional view of the flange step of the then punch out step represented in this work flow.
Embodiment
Below, with reference to accompanying drawing, sheet metal with threaded hole of the present invention, each mode of execution of possessing the housing of this sheet metal with threaded hole and the manufacture method of sheet metal with threaded hole are described.In addition, sheet metal with threaded hole of the present invention can be applied to without any one in the steel plate of coating and Coated Steel.
(the 1st mode of execution)
Fig. 1 is the figure of the tapped hole of the sheet metal 10 with threaded hole schematically showing present embodiment, is also longitudinal section when observing in the cross section of the central axis CL comprising tapped hole.In addition, in FIG, in order to make structure easy to understand, except sheet metal 10 with threaded hole, also showing screw with external thread 50 with imaginary line and there is the sheet metal 51 of through hole 51a.
As shown in Figure 1, the tapped hole 12 that the sheet metal 10 (below sometimes also referred to as sheet metal 10) with threaded hole of present embodiment has possesses outside wall portions 12a and inner wall part 12b.Outside wall portions 12a has the cylindrical shape generally perpendicularly erected from the main body 10a of sheet metal 10.If in other words, then cylindric outside wall portions 12a, its foundation part 12a1 as one end of axis and main body 10a are continuous, and its central axis CL is vertical with the surperficial 10x of main body 10a.The other end 12a2 in the direction along central axis CL of outside wall portions 12a and the foundation part 12c of inner wall part 12b is continuous.Inner wall part 12b has the cylindrical shape with outside wall portions 12a arranged coaxial, is formed as turning back to the inside from the upper end (described the other end 12a2) of outside wall portions 12a.Further, internal thread 12b1 is formed with at the inner peripheral surface of inner wall part 12b.
The tapped hole 12 of the sheet metal 10 with threaded hole of present embodiment, even if when being thinned this thickness of slab t, the degree that the wall thickness that also can alleviate the foundation part 12c of inner wall part 12b reduces, can improve the fastening force of tapped hole 12 and can prevent the breakage of tapped hole 12.About the reason that the sheet metal 10 with threaded hole by present embodiment suppresses the wall thickness of the foundation part 12c of inner wall part 12b to reduce, after will carry out describe.At this, as shown in the part of being irised out by single dotted broken line in FIG, " the foundation part 12c of inner wall part 12b " refers to the consecutive part of above-mentioned the other end 12a2 with outside wall portions 12a.
The tapped hole 12 that the sheet metal 10 with threaded hole of present embodiment has is for possessing outside wall portions 12a and the double wall construction of inner wall part 12b by being turned back by this outside wall portions 12a.Thus, screw with external thread 50 be screwed into operation and loosen operation time, even if inner wall part 12b bears the power in expanding direction due to the pressing from screw with external thread 50, because being supported from surrounding by outside wall portions 12a, so inner wall part 12b also can be stoped exceedingly to expanding Direction distortion, the reduction of fastening force and the breakage of tapped hole 12 can be prevented.
The tapped hole 12 that the sheet metal 10 with threaded hole of present embodiment has, as in manufacture method described later by illustrating, the inner peripheral surface of the outer circumferential face and outside wall portions 12a that are configured as inner wall part 12b when bending process contacts, but due to the effect of sprung back, being shaped the inner wall part 12b can to necking square to being out of shape a little.Thus, become following structure: under the state that screw with external thread 50 does not screw togather with the internal thread 12b1 of tapped hole 12, the outer circumferential face of inner wall part 12b separates from the inner peripheral surface of outside wall portions 12a, under the state that screw with external thread 50 and the internal thread 12b1 of tapped hole 12 screw togather, abutting with the inner peripheral surface of outside wall portions 12a at least partially of the outer circumferential face of inner wall part 12b.About this structure, Fig. 2 and Fig. 3 is used to further describe.
First, as shown in Figure 2, under the state being screwed into before tapped hole 12 by screw with external thread 50, due to the sprung back occurred after forming tapped hole 12 by bending process, the top 12b3 of inner wall part 12b is separated a little from the foundation part 12a1 of outside wall portions 12a.Thus, between the outer circumferential face and the inner peripheral surface of outside wall portions 12a of inner wall part 12b, be formed with gap a little.
Then, as shown in Figure 3, under the state that screw with external thread 50 has been screwed into tapped hole 12, the inner wall part 12b bearing the pressing force of screw with external thread 50 corresponding to sprung back's amount to expanding direction resiliently deformable, its result, the outer circumferential face of inner wall part 12b abuts with the inner peripheral surface of outside wall portions 12a thus appeals gap and disappears.Therefore, as previously mentioned, blocked by outside wall portions 12a and limit the distortion of inner wall part 12b, in addition, also being played the recuperability that inner wall part 12b will return the state of Fig. 2 by sprung back.Under the effect of this recuperability, as shown in the arrow X of Fig. 3, inner wall part 12b is exerted a force, so continue to be close between internal thread 12b1 and screw with external thread 50 by threaded screw 50 toward the outside.Thus, the fastening force between tapped hole 12 and screw with external thread 50 can be improved further and prevent loosening of screw with external thread 50.
As mentioned above, the tapped hole 12 of the sheet metal 10 with threaded hole of present embodiment possesses: from the outside wall portions 12a of the cylindrical shape that a face 10x of sheet metal 10 vertically erects; Inner wall part 12b with the cylindrical shape of turning back to the inner side of outside wall portions 12a from the upper edge of outside wall portions 12a, is formed with internal thread 12b1 at the inner peripheral surface of inner wall part 12b.
According to this structure, even if the thickness of slab t of thinning sheet metal 10 with threaded hole, tapped hole 12 and the fastening force of screw with external thread 50 also can be made excellent and prevent the breakage of tapped hole 12.And tapped hole 12 is the integrated component formed by formed machining, so without the need to spending the time such as welding processing, processing cost also can not significantly increase.
In addition, in the sheet metal 10 with threaded hole of present embodiment, the top 12b3 of inner wall part 12b and another face 10y of sheet metal is coplanar.
According to this structure, such as, when to this sheet metal 10 with threaded hole become whole of above-mentioned another face 10y of attachment face require the flatness of no concave-convex, the concavo-convex degree that the formation due to tapped hole 12 can be caused prevents inferior limit, and can guarantee that the length dimension of internal thread 12b1 is maximum.Thus, can obtain having attractive in appearance and sheet metal 10 with threaded hole that is fastening force concurrently.
Then, the housing of Fig. 1 and Fig. 4 to present embodiment is below used to be described.
As shown in Figure 4, the housing 70 of present embodiment possesses: above-mentioned sheet metal 10 with threaded hole; There are the parts (sheet metal) 51 of through hole 51a; And the screw with external thread 50 being screwed into tapped hole 12 with the state being inserted into through hole 51a and will combining between sheet metal 10 with threaded hole and parts 51.In addition, Fig. 4 is exploded perspective view, and under state sheet metal 10 with threaded hole and parts 51 engaged by screw with external thread 50 being screwed into tapped hole 12, the major component sectional view of tapped hole 12, as shown in Figure 1.
Housing 70 according to the present embodiment, because sheet metal 10 with threaded hole possesses above-mentioned structure, so tapped hole 12 is excellent with the fastening force of screw with external thread 50, and also can prevent the breakage of tapped hole 12.In addition, the housing 70 that the screw with external thread 50 that also can prevent from being screwed into loosens is become.In addition, as housing 70, the housing etc. that the indoor set of air-conditioning and outdoor unit also have converting equipment etc. can be illustrated.
In addition, in FIG, there is the 12b3 side, top that the sheet metal of through hole 51a and parts 51 are installed on inner wall part 12b, but be not limited to this structure, also can adopt the structure of foundation part 12c side parts 51 being installed on inner wall part 12b.That is, in FIG, the configuration relation up and down of sheet metal 10 with threaded hole and parts 51 can also be made conversely.In addition, " the top 12b3 of inner wall part 12b " refers to and be positioned at the end with above-mentioned foundation part 12c opposite side on the direction along central axis CL.In addition, parts 51 are not limited to sheet metal, also comprise the appurtenances etc. with through hole.
Then, the manufacture method of the sheet metal 10 with threaded hole of present embodiment is described.In the present embodiment, after outside wall portions forming step, carry out punch out step, but also can adopt the variation (aftermentioned) of carrying out outside wall portions forming step after punch out step.
Fig. 5 A ~ 5D is the schematic diagram of the work flow of the manufacture method of the sheet metal representing present embodiment, and Fig. 5 A represents outside wall portions forming step, and Fig. 5 B represents punch out step, and Fig. 5 C represents inner wall part forming step, and Fig. 5 D represents internal thread forming step.
First, in outside wall portions forming step, at the plectane portion 20b that processing object and sheet metal 20 (blank) are gone up shaped exterior wall portion 20a and be connected with this outside wall portions 20a.One end on the central axis CL direction of cylindric outside wall portions 20a is continuous mutually with the main body of sheet metal 20, and cylindric outside wall portions 20a erects from sheet metal 20 and makes its central axis CL vertical with the surface of sheet metal 20.The inner side of the other end on the central axis CL direction of outside wall portions 20a is continuous with plectane portion 20b phase.
The outside wall portions 20a of such shape and plectane portion 20b, can be shaped by using the convex shaping of drum of drift and punch die or drawing processing.When the convex shaping of drum, as shown in Figure 5A, except bulging is with except drift 35 and bulging punch die 36, also use holding pad 36a.By holding pad 36a and punch die 36 from the state that surface and the back side of sheet metal 20 clamp this sheet metal 20, make drift 35 and punch die 36 and holding pad 36a relative movement, thus a part for sheet metal 20 be pressed in punch die 36 together with drift 35.Thus, sheet metal 20 has been shaped cylindric outside wall portions 20a and plectane portion 20b.
In punch out step then, get bottom outlet at the center of plectane portion 20b.That is, as shown in Figure 5 B, by using punching drift 31 and punching punch die 32 to carry out the punching completed based on shearing, bottom outlet 20b1 is got at plectane portion 20b thus.Punching also can by using the cutting of drill bit and/or using the perforation processing of laser cutter to carry out.
In inner wall part forming step then, be equipped with the plectane portion 20b of bottom outlet 20b1 by bending, the inner wall part 12b turned back in the inner side be shaped thus to outside wall portions 20a (12a).The bending of this plectane portion 20b can be undertaken by so-called reaming processing.
That is, in reaming processing, reaming drift 37 as shown in Figure 5 C, reaming punch die 38 and holding pad 39 can be used to carry out.That is, by punch die 38 and holding pad 39 from the state that surface and the back side of sheet metal 20 clamp this sheet metal 20, make drift 37 and punch die 38 and holding pad 39 relative movement.Now, drift 37 is made to be pressed in bottom outlet 20b1.So, if the plectane portion 20b of sheet metal 20 to be pressed into together with drift 37 inner side of outside wall portions 20a, then plectane portion 20b is while also expanded to radial direction on one side by the pressing direction stretching to drift 37, its result, forms the inner wall part 12b (20b) cylindrically and from outside wall portions 12a (20a) turned back to the inside.Now, although the inner peripheral surface of the outer circumferential face and outside wall portions 12a that are formed as inner wall part 12b contacts, inner wall part 12b because of sprung back to necking square to being out of shape a little, so gap as shown in Figure 2 can be produced.
In thread cutting step then, process internal thread 12b1 at the inner peripheral surface of formed inner wall part 12b.The processing method of internal threads 12b1 is not particularly limited, such as, can carry out machining internal thread 12b1 by screw tap 40 as shown in Figure 5 D.As mentioned above, manufacture method according to the present embodiment, can obtain sheet metal 10 with threaded hole, on sheet metal 20, namely process the tapped hole 12 of the inner wall part 12b possessing outside wall portions 12a and a part of this outside wall portions 12a turned back.
Manufacture method according to the present embodiment, processes with the such use flange used illustrated by Figure 11 and is formed compared with the method in the past of tapped hole, can alleviate the degree reduced at the foundation part wall thickness of tapped hole.Namely, in manufacture method in the past, as shown in Figure 12 B, man-hour is added under the state clamping sheet metal 520 by punch die 534 and holding pad 539 at flange, by making this bottom outlet peripheral part be out of shape in the recess that the bottom outlet peripheral part of sheet metal 520 is pressed into together with drift 533 punch die 534, be shaped longitudinal wall part 511 thus.Now, because in sheet metal 520, the foundation part 511a of the bottom outlet periphery of distortion is contiguous with the part clamped by punch die 534 and holding pad 539, so produce very large tensile stress in the foundation of longitudinal wall part 511, its result, facilitates wall thickness and reduces.
On the other hand, in the present embodiment, as shown in Figure 5 C in inner wall part forming step under the state clamping sheet metal 20 by punch die 38 and holding pad 39, plectane portion 20b is pressed into together with drift 37 inner side of outside wall portions 20a (12a) and this plectane portion 20b is out of shape, be shaped inner wall part 12b thus.Now, in sheet metal 20, outside wall portions 12a is between the plectane portion 20b and the part being held between punch die 38 and holding pad 39 of distortion.Thus, the tensile stress produced is relaxed, its result at the foundation part 12c of inner wall part 12b, compared with above-mentioned foundation part 511a (with reference to Figure 11) in the past, the wall thickness reduction of foundation part 12c can be reduced.
Therefore, manufacture method according to the present embodiment, can improve the fastening force of formed tapped hole 12 and screw with external thread 50 and also prevent the breakage of tapped hole 12.In addition, because tapped hole 12 is the double wall construction of outside wall portions 12a and inner wall part 12b, so inner wall part 12b can be stoped to expanding Direction distortion, can prevent by being out of shape the reduction of fastening force and the breakage of tapped hole 12 that cause.And form inner wall part 12b due to bending plectane portion 20b, if so screw with external thread 50 to be screwed into tapped hole 12, then can produce recuperability due to the sprung back of inner wall part 12b, inner wall part 12b is close to screw with external thread 50.Thus, the fastening force of tapped hole 12 improves further, and can prevent be screwed into screw with external thread 50 from loosening more effectively.
Present embodiment can be shaped by outside wall portions, punch, inner wall part is shaped and internal thread forms this 4 steps and forms tapped holes 12, so compared with the tapped hole in the past proposed with above-mentioned patent documentation 1, can reduce the increase of machining period.In addition, in above-mentioned 4 steps, high machining accuracy is not required.Therefore, manufacture method according to the present embodiment, compared with the tapped hole proposed, can reduce the rising of processing cost with above-mentioned patent documentation 1.
The manufacture method of sheet metal with threaded hole of the present invention, as the mode beyond above-mentioned explanation, also can adopt the such as variation shown in Fig. 6 A ~ 6D.
Fig. 6 A represents punch out step, and Fig. 6 B represents outside wall portions forming step, and Fig. 6 C represents inner wall part forming step, and Fig. 6 D represents internal thread forming step.In this variation, when forming tapped hole 12, first in punch out step, get bottom outlet.That is, as shown in Figure 6A, use punching drift 31 and punching punch die 32 to be punched by shearing, the sheet metal 20 of processing object gets bottom outlet 20b1.Punching also can by using the cutting of drill bit and/or using the perforation processing of laser cutter to carry out.
In outside wall portions forming step then, as shown in Figure 6B, sheet metal 20 is shaped cylindric outside wall portions 20a and with this outside wall portions 20a consecutive plectane portion 20b.One end axially of cylindric outside wall portions 20a and foundation part continuous with sheet metal 20 phase, the outside wall portions 20a of cylindrical shape erects from sheet metal 20 and makes its central axis CL vertical with the surface of sheet metal 20.In addition, the inner side along the other end on the direction of central axis CL of outside wall portions 20a is continuous with plectane portion 20b phase.In this variation, such outside wall portions 20a and plectane portion 20b is configured as bottom outlet 20b1 concentric with cylindric outside wall portions 20a.
The shaping of outside wall portions 20a and plectane portion 20b, can be undertaken by using the convex shaping of drum of drift and punch die or drawing processing.When the convex shaping of drum, except using bulging drift 35 and the bulging punch die 36 shown in Fig. 6 B, also use holding pad 36a.Center sheet metal 20 being configured to its bottom outlet 20b1 is consistent with the center of the recess of punch die 36, clamps sheet metal 20 by punch die 36 and holding pad 36a.In this condition, make drift 35 and punch die 36 and holding pad 36a relative movement, a part for sheet metal 20 is pressed in punch die 36 together with drift 35.Thus, sheet metal 20 is shaped plectane portion 20b and cylindric outside wall portions 20a.Now, bottom outlet 20b1 be out of shape and expanding.
In inner wall part forming step then, as shown in Figure 6 C, by bending plectane portion 20b formed thereby, be shaped inner wall part 12b thus that turn back to the inside from outside wall portions 12a.
In internal thread forming step then, as shown in Figure 6 D, internal thread 12b1 is processed at the inner peripheral surface of inner wall part 12b.The bending of plectane portion 20b can be processed by reaming and be carried out in the same manner as above-mentioned mode of execution.In addition, same with above-mentioned mode of execution, the processing of internal threads 12b1 is not particularly limited, such as, can be processed by screw tap 40.
By the manufacture method of above-mentioned variation, also the tapped hole 12 possessing outside wall portions 12a and inner wall part 12b can be formed on sheet metal 20.In addition, in this variation, when bending plectane portion 20b in inner wall part forming step, in sheet metal 20, outside wall portions 12a is between the plectane portion 20b and the part clamped by punch die 38 and holding pad 39 of distortion.Therefore, it is possible to the degree that the wall thickness alleviating the foundation part 12c of inner wall part 12b reduces, its result, can improve the fastening force of tapped hole 12 and can prevent the breakage of tapped hole 12.
In addition, in this variation, also same with above-mentioned mode of execution, the tapped hole 12 obtained is for having the double wall construction of outside wall portions 12a and inner wall part 12b, so inner wall part 12b can be stoped to expanding direction excessive deformation, the reduction of the fastening force caused thus and the breakage of tapped hole 12 can be prevented.And if screw with external thread 50 is screwed into tapped hole 12, then inner wall part 12b is close to screw with external thread 50 because of sprung back.Thus, the fastening force of tapped hole 12 improves further, and can prevent be screwed into screw with external thread 50 from loosening.
This variation can be shaped by punching, outside wall portions, inner wall part is shaped and internal thread form these 4 steps and manufactures tapped hole 12, so compared with the tapped hole in the past proposed with above-mentioned patent documentation 1, can suppress the increase of machining period.In addition, above-mentioned 4 steps do not require high machining accuracy.Therefore, compared with the tapped hole that this variation and above-mentioned patent documentation 1 propose, the rising of processing cost can be reduced.
This variation also can utilize identical device to carry out the step that outside wall portions is shaped and inner wall part is shaped, and further can suppress the increase of machining period in this case.Specifically, in fig. 6b, with the reaming drift 37 (illustrating slightly) shown in the mode allocation plan 6C relative with bulging drift 35.Thereby, it is possible to after the outside wall portions 20a (12a) and plectane portion 20b that has been shaped by bulging drift 35 and bulging punch die 36, at once carry out shaping inner wall portion 12b by reaming drift 37.
The 1st mode of execution and variation thereof for the above-described, in outside wall portions forming step (with reference to Fig. 5 A, Fig. 6 B) when shaped exterior wall portion 20a (12a) and plectane portion 20b, the radius R (mm) of punch die 36 and shoulder is all preferably used to meet the drift 35 of following mathematical expression (1).In addition, in punch out step (with reference to Fig. 5 B, Fig. 6 A), preferably, the radius r (mm) of the bottom outlet before the inner wall part got in the inner wall part forming step after bottom outlet makes is shaped meets following mathematical expression (2).In addition, t represents the thickness of slab (mm) of sheet metal 20.
0.5≤R/t≤1.0 mathematical expression (1)
0.5≤r/t≤1.2 mathematical expression (2)
At this, " radius of shoulder " of so-called drift 35 refers to the radius in R portion, and the outer circumferential face of the drift 35 abutted with the outside wall portions 20a (12a) forming in sheet metal 20 and the top end of drift 35 that abuts with plectane portion 20b formed thereby are connected (reference Fig. 5 A and Fig. 6 B) by this R portion.In addition, " inner wall part in inner wall part forming step be shaped before the radius of bottom outlet " specifically: the radius referring to the bottom outlet 20b1 got by the punch out step shown in Fig. 5 B in the above-described embodiment, at the radius of above-mentioned variation middle finger by the bottom outlet 20b1 under the state of the outside wall portions forming step shown in Fig. 6 B after punch out step to expanding Direction distortion.
If the radius R (mm) of the shoulder of drift 35 is less than 0.5 × t (mm) in outside wall portions forming step, then drift 35 enters (Shi い Write body) R portion (curved section) that outside wall portions 20a (12a) is connected with plectane portion 20b, and even it is bad sometimes to produce product because of the phenomenon of the wall thickness minimizing fracture of this part, manufactures up-to-standard rate and reduces.On the other hand, if the radius R of the shoulder of drift 35 (mm) is larger than 1.0 × t (mm), then in inner wall part forming step, the R portion (curved section) that outside wall portions 20a (12a) is connected with plectane portion 20b can not fully be bent, outside wall portions 20a (12a) swings to inner wall part 12b side, and it is bad that its result still likely produces product.
In addition, if the radius r of bottom outlet 20b1 (mm) is less than 0.5 × t (mm), then when bending plectane portion 20b in inner wall part forming step, make the power needed for the distortion of the peripheral part of bottom outlet 20b1 excessive.Thus, the R portion (curved section) be connected with the main body of sheet metal 20 by outside wall portions 20a (12a) can be out of shape, its result, cannot be shaped inner wall part 12b and outside wall portions 20a (12a) and to produce product bad sometimes, manufactures up-to-standard rate and reduce.On the other hand, if the radius r of bottom outlet (mm) is larger than 1.2 × t (mm), then the height of the inner wall part 12b be shaped by inner wall part forming step is diminished, and the quantity of worm tooth tails off.Therefore, the sufficient fastening force with screw with external thread 50 cannot likely be obtained.
At sheet metal with threaded hole of the present invention, possess in the housing of this sheet metal and the manufacture method of sheet metal with threaded hole, the material of sheet metal itself is not particularly limited.
The manufacture method of sheet metal with threaded hole of the present invention, preferably, uses the drift 37 being provided with tapering on top shown in Fig. 5 C and Fig. 6 C in inner wall part forming step.Its reason is, external diameter is provided with compared with the flange drift 533 of straight tube shape as shown in Figure 12 B in the explanation of conventional art with the drift 37 in the tapering diminished close to top if use, then the easy R portion (curved part) being connected with plectane portion 20b by outside wall portions 20a (12a) promotes bending deflection, can suppress falling down of outside wall portions 20a (12a).
(the 2nd mode of execution)
Below, Fig. 7 is used to be described the 2nd mode of execution of the present invention.Illustrate time, by with the difference of above-mentioned 1st mode of execution centered by be described, other guide is set to identical with above-mentioned 1st mode of execution and omits the description.
Fig. 7 is the figure of the tapped hole 12 of the sheet metal 100 with threaded hole schematically showing present embodiment, is also the longitudinal section suitable with Fig. 3 when observing in the cross section of the central axis CL comprising tapped hole 12.
The sheet metal 100 with threaded hole of present embodiment, the length dimension L1 of its inner wall part 12b is than the length ruler modest ability of the inner wall part 12b of above-mentioned 1st mode of execution.Its result, the top 12b3 of inner wall part 12b gives prominence to than above-mentioned another face 10y of sheet metal.
According to this structure, such as, sheet metal 100 with threaded hole is overlapping with other sheet metals 51 and when carrying out contraposition, as shown in Figure 7, by embedding in the through hole 51a of other sheet metals 51 by the projection of inner wall part 12b, and easily can carry out contraposition.
In addition, the length dimension of internal thread 12b1 also can be set to the length ruler modest ability of the internal thread 12b1 than above-mentioned 1st mode of execution, so also can lengthen the length of the part screwed togather with screw with external thread 50 and carry out fastening more effectively.
(the 3rd mode of execution)
Below, Fig. 8 is used to be described the 3rd mode of execution of the present invention.Illustrate time, by with the difference of above-mentioned 1st mode of execution centered by be described, other guide is set to identical with above-mentioned 1st mode of execution and omits the description.
Fig. 8 is the figure of the tapped hole 12 of the sheet metal 110 with threaded hole schematically showing present embodiment, is also the longitudinal section suitable with Fig. 3 when observing in the cross section of the central axis CL comprising tapped hole 12.
The sheet metal 10 with threaded hole of present embodiment, the length dimension L2 of its inner wall part 12b is shorter than the length dimension of the inner wall part 12b of above-mentioned 1st mode of execution.Its result, the top 12b3 of inner wall part 12b is in and leans on inner position than above-mentioned another face 10y of sheet metal.Therefore, when being screwed to the end, gap a little can be produced between the surface of other sheet metals 51.
According to this structure, such as when by when screw with external thread 50 being screwed to the end after superimposed to sheet metal with threaded hole 10 and other sheet metals 51, inner wall part 12b is shorter than inner wall part 12b when above-mentioned 1st mode of execution, so the length of the part screwed togather with screw with external thread 50 shortens.But, owing to having described gap, so when having tightened screw with external thread 50, allow the screw head of top 12b3 closer to screw with external thread 50 of inner wall part 12b.Further, while screw with external thread 50 is tightened, screw with external thread 50 will by inner wall part 12b towards self tractive, its result, and cylindric inner wall part 12b wants undergauge.Thus, inner wall part 12b is close to screw with external thread 50 more closely, can guarantee high fastening force.
(the 4th mode of execution)
Below, Fig. 9 is used to be described the 4th mode of execution of the present invention.Illustrate time, by with the difference of above-mentioned 1st mode of execution centered by be described, other guide is set to identical with above-mentioned 1st mode of execution and omits the description.
Fig. 9 is the figure of the tapped hole 212 of the sheet metal 200 with threaded hole schematically showing present embodiment, is also the longitudinal section suitable with Fig. 3 when observing in the cross section of the central axis CL comprising tapped hole 212.
The sheet metal 200 with threaded hole of present embodiment is the sheet metal with tapped hole 212, the inner wall part 212b that tapped hole 212 possesses the cylindrical shape erected from a face of the sheet metal 220 and outside wall portions 212a of cylindrical shape turned back to the outside of inner wall part 212b from the ora terminalis of inner wall part 212b, is formed with internal thread 212b1 at the inner peripheral surface of inner wall part 212b.
In the structure shown here, different from above-mentioned 1st mode of execution, although the effect of the sprung back of inner wall part 212b cannot be obtained, the distortion in the expanding direction of inner wall part 212b when tightening screw with external thread (not shown) can be blocked by outside wall portions 212a.Thus, due to the excessive distortion of inner wall part 212b can be limited, even if so the thickness of slab of thinning sheet metal 220, the breakage of tapped hole 212 and the reduction of fastening force also can be prevented.
In addition, the sheet metal 200 with threaded hole of present embodiment also can be used as the constituting component of housing.Namely, in the housing possessing sheet metal, parts and screw with external thread, as described sheet metal, above-mentioned sheet metal 200 with threaded hole can be used, this sheet metal has tapped hole, these parts have through hole, and this screw with external thread is screwed into above-mentioned tapped hole with the state inserting above-mentioned through hole and is combined with above-mentioned parts by above-mentioned sheet metal.
Embodiment
In order to confirm effect of the present invention, form tapped hole on a metal plate by the manufacture method of sheet metal with threaded hole of the present invention, and carry out the test evaluating the fastening force of this tapped hole.
As sample, thickness of slab is used to be 0.4 ~ 0.6mm and the tensile strength steel plate that is 270MPa grade.On this steel plate, having processed nominal diameter in JISB0205 (2001) by the manufacture method of the sheet metal with threaded hole using the 1st mode of execution illustrated by Fig. 5 A ~ 5D is the tapped hole of M3.
Outside wall portions forming step, by drum convex shaping and carrying out, uses bulging drift 35 that external diameter is 3.2mm, has punch die 36 and holding pad 36a that internal diameter is the recess of 4.6mm, and being shaped is highly the outside wall portions 20a of 1.4mm.Now, the shoulder radius R of bulging drift 35 is made to change.In addition, punch out step uses punching drift 31 and punching punch die 32 to be undertaken by shearing, now makes the radius r of bottom outlet 20b1 change.Inner wall part forming step uses reaming drift 37, reaming punch die 38 and the holding pad 39 that top is cone-shaped to carry out.Reaming drift 37 uses following drift: the radius of vertical tube part is 1.2mm, and the bottom corner in tapering has the chamfering of 60 ° relative to central axis CL, and the radius on the top in tapering is 1.4mm.
In order to compare, by using the work flow illustrated by Figure 12 A and Figure 12 B, also make the sheet metal 10 (test No.1-1A, 2-1A, 3-1A) with threaded hole being formed with the tapped hole that flange machining in the past obtains on a metal plate.
In addition, in order to compare, also make the sheet metal (not shown) (test No.1-1B, 2-1B, 3-1B) with threaded hole of the structure of Fig. 1 record possessing the patent documentation 2 quoted in the introduction.If use the Fig. 1 shown in above-mentioned mode of execution 1 to be described, this comparative example is following structure: even if under the state being screwed into screw with external thread 50, the inner peripheral surface of outside wall portions 12a and the outer circumferential face of inner wall part 12b are also separated and produce large gap, and the surrounding of inner wall part 12b is not supported by outside wall portions 12a.
In each test, prepare 20 sheet metals respectively and processed tapped hole.Now, the generation number of packages that investigation processing is bad, calculates manufacture up-to-standard rate.
In addition, for the tapped hole of each sheet metal with threaded hole, carry out the test for evaluating fastening force.In the test of fastening force evaluating tapped hole, use the threaded fastening device that can measure fastening torque, and screw with external thread is screwed into the tapped hole of sheet metal.Now, the relation of the externally threaded angle of rotation of screw and fastening torque is measured.By carrying out differential according to angle of rotation to the externally threaded angle of rotation (°) of obtained screw and the relation of fastening torque (Nm), obtain the relation of the change ratio (Nm/ °) of the externally threaded angle of rotation (°) of screw and fastening torque thus.
Figure 10 be represent in the test of the fastening force evaluating tapped hole, the schematic diagram of the relation of the externally threaded angle of rotation of screw and the relation of fastening torque and the change ratio of the externally threaded angle of rotation of screw and fastening torque.As shown in the drawing, if angle of rotation increases with being screwed into of screw with external thread, then fastening torque from the starting stage be roughly 0 (zero) and certain state-transition for after increasing, again become roughly certain, reduce afterwards.According to the relation of such angle of rotation and fastening torque, obtain fastening torque from for 0 and certain state-transition is the some O increased.
On the other hand, if angle of rotation increases with being screwed into of screw with external thread, then the change ratio of fastening torque is after above-mentioned some O starts increase, becomes roughly certain, reduces afterwards.According to the relation of the change ratio of the externally threaded angle of rotation of such screw and fastening torque, the change ratio obtaining fastening torque is the angle of rotation reduced from certain state-transition.By represent this angle of rotation time angle of rotation and fastening torque relation curve on point be set to an A.This A represents that internal thread (tapped hole) starts the point of plastic deformation.
Draw the straight line L linked by the some O obtained like this and some A.In addition, draw straight line L is moved in parallel 10 ° and the straight line L ' obtained to the direction that angle of rotation increases.By this straight line L ' with represent that the intersection point of curve of relation of angle of rotation and fastening torque is set to a B.As the index of the fastening force of evaluation tapped hole, calculate the fastening torque (Nm) of a B and the ratio (TB/TA, zero dimension) of the fastening torque TA (Nm) of some A.Such TB/TA represents the ratio maintaining fastening torque after internal thread starts plastic deformation, in other words represents the ratio of the fastening force maintaining tapped hole and screw with external thread after internal thread starts plastic deformation.Therefore, TB/TA is larger, then the fastening force of tapped hole and screw with external thread is more excellent.
The implication of the mark on " evaluation of the fastening force " hurdle in table 1 ~ 3 is as follows.
VG (VeryGood: very good): represent and meet TB/TA >=1.2.
GD (Good: good): represent and meet 1.2>TB/TA >=1.0.
FA (Fair: general): represent and meet 1.0>TB/TA >=0.8.
BD (Bad: bad): represent and meet TB/TA < 0.8.
Table 1 ~ 3 respectively illustrate the test No. of each test, the thickness of slab t of sheet metal, the processing method of tapped hole, the shoulder radius R of bulging drift, R/t value, whether meet above-mentioned mathematical expression (1), inner wall part be shaped before the radius r of bottom outlet, r/t value, whether meet above-mentioned mathematical expression (2), manufacture up-to-standard rate, the value of the index TB/TA of fastening force and evaluation thereof, also have test classification.At this, about meeting situation to above-mentioned mathematical expression (1), represent that when " Y " value of R/t meets above-mentioned mathematical expression (1), the above-mentioned mathematical expression of the value foot with thumb down (1) of R/t when " N ".In addition, about meeting situation to above-mentioned mathematical expression (2), representing that when " Y " value of r/t meets above-mentioned mathematical expression (2), representing that when " N " value of r/t does not meet above-mentioned mathematical expression (2).
(table 1)
(table 2)
(table 3)
According to table 1 ~ 3, with regard to the evaluation of fastening force, be BD in a comparative example, be VG, GD or FA relative to this in example of the present invention.Therefore, it is possible to confirm: sheet metal with threaded hole of the present invention, possess in the housing of this sheet metal and the manufacture method of sheet metal, the fastening force of tapped hole and screw with external thread is excellent.
In addition, in comparative example (test No.1-1A, 2-1A, 3-1A), in flange processing, the kan gene wall thickness of longitudinal wall part reduces and breaks and/or fully cannot form the worm tooth of tapped hole in thread cutting, cause product bad, the bad generation quantity of product is thinning and increase with the thickness of slab of sample.Its result, in a comparative example, manufactures up-to-standard rate and is less than 70%.On the other hand, in example of the present invention, be more than 90%, manufacture up-to-standard rate can be improved.
In addition, in comparative example (test No.1-1B, 2-1B, 3-1B), the internal thread machining part suitable with inner wall part be not owing to being supported by peripheral part suitable with outside wall portions, so rigidity is low, therefore there will be and be difficult to carry out tapping accurately and machining accuracy this problem uneven in the circumferential that machining accuracy, internal thread cannot be guaranteed.If the rigidity of internal thread machining part suitable with inner wall part like this machining accuracy that is weak and internal thread is low, then the mated condition (conjunction of Department り tool) between internal thread and outside thread easily becomes uneven in the circumference of internal thread.
In addition, in example of the present invention, be less than the test of 0.5 and the value of R/t has exceeded in the test of 1.0 in the value of R/t, all confirmed and manufactured up-to-standard rate and there is some reductions.On the other hand, be less than in the test of 0.5 in the value of r/t, confirmed manufacture up-to-standard rate and there is some reductions.In addition, the value of r/t be in the test of less than 1.2 fastening force be evaluated as VG or GD, on the other hand, exceeded in the test of 1.2 in the value of r/t, the evaluation of fastening force becomes FA.It can thus be appreciated that, by in outside wall portions forming step, use the drift that meets above-mentioned mathematical expression (1) and get bottom outlet inner wall part is shaped before the radius r of bottom outlet meet above-mentioned mathematical expression (2), thereby, it is possible to improve the fastening force manufacturing up-to-standard rate and tapped hole further.
Utilizability in industry
According to sheet metal with threaded hole of the present invention, possess the housing of sheet metal with threaded hole and the manufacture method of sheet metal with threaded hole, even if at thin-walled property, the fastening force of tapped hole and screw with external thread is also excellent and also can to prevent the breakage of tapped hole.Therefore, if sheet metal with threaded hole of the present invention, the manufacture method of housing and sheet metal with threaded hole that possesses sheet metal with threaded hole are applied to the outdoor unit of air-conditioning and the housing of converting equipment, then can contribute to very much the thin-walled property of sheet metal.
Description of reference numerals
10,100,110,200: sheet metal with threaded hole; 10x a: face of sheet metal; 10y: another face of sheet metal; 12: tapped hole; 12a, 212a: outside wall portions; 12b, 212b: inner wall part; 12b1,212b1: internal thread; 12b3: the top of inner wall part; 20b: plectane portion; 37: drift; 50: screw with external thread; 51: parts; 51a: through hole; 70: housing.

Claims (14)

1. a sheet metal with threaded hole, is characterized in that,
The outside wall portions that described tapped hole possesses the cylindrical shape erected from a face of described sheet metal and the inner wall part of cylindrical shape of turning back to the inner side of described outside wall portions from the ora terminalis of described outside wall portions,
Internal thread is formed at the inner peripheral surface of described inner wall part.
2. sheet metal with threaded hole according to claim 1, is characterized in that,
The top of described inner wall part and another face of described sheet metal coplanar.
3. sheet metal with threaded hole according to claim 1, is characterized in that,
Under the state of described internal thread that screw with external thread is not screwed together in described tapped hole, the outer circumferential face of described inner wall part is separated from the inner peripheral surface of described outside wall portions,
Under the state of described internal thread that described screw with external thread is screwed together in described tapped hole, the described inner peripheral surface being connected to described outside wall portions at least partially of the described outer circumferential face of described inner wall part.
4. sheet metal with threaded hole according to claim 3, is characterized in that,
The top of described inner wall part and another face of described sheet metal coplanar.
5. a sheet metal with threaded hole, is characterized in that,
The inner wall part that described tapped hole possesses the cylindrical shape erected from a face of described sheet metal and the outside wall portions of cylindrical shape of turning back to the outside of described inner wall part from the ora terminalis of described inner wall part,
Internal thread is formed at the inner peripheral surface of described inner wall part.
6. a housing, possess the sheet metal with tapped hole, the parts with through hole and screw with external thread, this screw with external thread is screwed into described tapped hole with the state inserting described through hole and is combined with the described parts with through hole by described sheet metal, and the feature of described housing is
Described sheet metal is the sheet metal with threaded hole according to any one of Claims 1 to 5.
7. a manufacture method for sheet metal with threaded hole, is the method for the sheet metal with threaded hole according to any one of manufacturing claims 1 ~ 4, it is characterized in that having:
Described outside wall portions that described sheet metal is shaped and the step with consecutive plectane portion, the inner side of described outside wall portions;
The step of bottom outlet is got at the center in described plectane portion;
The described plectane portion being equipped with described bottom outlet is formed the step of inner wall part described in shape to lateral buckling in described outside wall portions; And
The step of described internal thread is processed at the described inner peripheral surface of described inner wall part formed thereby.
8. the manufacture method of sheet metal with threaded hole according to claim 7, is characterized in that,
In the step in described outside wall portions that the described sheet metal of thickness size t is shaped and described plectane portion, use the drift with the shoulder size of the radius R meeting following mathematical expression 1, wherein, the unit of t and R is millimeter,
0.5≤R/t≤1.0 mathematical expression 1.
9. the manufacture method of sheet metal with threaded hole according to claim 7, is characterized in that,
The described sheet metal of thickness size t is got in the step of described bottom outlet, and get described bottom outlet and make the radius r of described bottom outlet meet following mathematical expression 2, wherein, the unit of t and r is millimeter,
0.5≤r/t≤1.2 mathematical expression 2.
10. the manufacture method of sheet metal with threaded hole according to claim 7, is characterized in that,
The described sheet metal of thickness size t in the step in the described outside wall portions that is shaped and described plectane portion, use the drift with the shoulder size of the radius R meeting following mathematical expression 1,
Described sheet metal is got in the step of described bottom outlet, and get described bottom outlet and make the radius r of described bottom outlet meet following mathematical expression 2, wherein, the unit of t, R and r is millimeter,
0.5≤R/t≤1.0 mathematical expression 1
0.5≤r/t≤1.2 mathematical expression 2.
The manufacture method of 11. 1 kinds of sheet metals with threaded hole, is the method for the sheet metal with threaded hole according to any one of manufacturing claims 1 ~ 4, it is characterized in that having:
Described sheet metal is got the punch out step of bottom outlet;
To be shaped with one heart described outside wall portions and the step with consecutive plectane portion, the inner side of described outside wall portions with described bottom outlet;
Described plectane portion is formed the step of inner wall part described in shape to lateral buckling in described outside wall portions; And
The step of described internal thread is processed at the described inner peripheral surface of described inner wall part.
The manufacture method of 12. sheet metals with threaded hole according to claim 11, is characterized in that,
In the step in described outside wall portions that the described sheet metal of thickness size t is shaped and described plectane portion, use the drift with the shoulder size of the radius R meeting following mathematical expression 1, the unit of t and R is millimeter,
0.5≤R/t≤1.0 mathematical expression 1.
The manufacture method of 13. sheet metals with threaded hole according to claim 11, is characterized in that,
The described sheet metal of thickness size t is got in the step of described bottom outlet, and get described bottom outlet and make the radius r forming the described bottom outlet after the step in described plectane portion meet following mathematical expression 2, wherein, the unit of t and r is millimeter,
0.5≤r/t≤1.2 mathematical expression 2.
The manufacture method of 14. sheet metals with threaded hole according to claim 11, is characterized in that,
The described sheet metal of thickness size t in the step in the described outside wall portions that is shaped and described plectane portion, use the drift with the shoulder size of the radius R meeting following mathematical expression 1,
Described sheet metal is got in the step of described bottom outlet, and get described bottom outlet and make the radius r forming the described bottom outlet after the step in described plectane portion meet following mathematical expression 2, wherein, the unit of t, R and r is millimeter,
0.5≤R/t≤1.0 mathematical expression 1
0.5≤r/t≤1.2 mathematical expression 2.
CN201480019744.6A 2013-07-25 2014-07-18 The manufacture method of metallic plate with threaded hole, housing and metallic plate with threaded hole Active CN105408641B (en)

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JP2019517923A (en) * 2016-05-25 2019-06-27 シェフラー テクノロジーズ アー・ゲー ウント コー． カー・ゲーＳｃｈａｅｆｆｌｅｒ Ｔｅｃｈｎｏｌｏｇｉｅｓ ＡＧ ＆ Ｃｏ． ＫＧ Spindle nut, screw drive and method of manufacturing a spindle nut

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JP6370759B2 (en) * 2015-10-14 2018-08-08 株式会社栗山百造 Manufacturing method of nut with washer
KR20220088467A (en) * 2020-10-30 2022-06-27 도시바 미쓰비시덴키 산교시스템 가부시키가이샤 Thread hole machining method
KR20240082008A (en) * 2022-12-01 2024-06-10 삼성전자주식회사 Refrigerator

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JPWO2015012236A1 (en) 2017-03-02
KR20150123921A (en) 2015-11-04
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WO2015012236A1 (en) 2015-01-29
CN105408641B (en) 2018-02-02

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