JP2005001603A - Collar/frame coupling body, and method for assembling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collar/frame coupling body which comprises a metal frame of a hollow closed-sectional structure having a pair of flat wall parts facing each other and a collar which is disposed at a position corresponding to a bolt hole formed in each of the flat wall parts across a frame hollow part, is tightened to a supporting member by bolts passing through the collar and the bolt holes, and capable of firmly and efficiently fixing the collar to the metal frame at low cost without using any welding means. <P>SOLUTION: A collar C is held between surfaces facing each other of a pair of flat wall parts Wu and Wd of a frame 1 at the fitting position Xc. The frame 1 is formed so as to advance the collar C to the fitting position Xc from an opening end O thereof. An engagement claw part 3 which is engaged with the opening edge of the collar C to fix the collar C to the frame 1 is integrated with the opening edge part of a bolt hole h of one flat wall part Wu by burring. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a hollow closed cross-section metal frame having a pair of opposed flat wall portions, and a hollow of the frame disposed at a predetermined mounting position corresponding to a bolt hole formed in each of the flat wall portions. A collar / frame assembly that can be fastened to a support member using at least a bolt that penetrates the collar and both bolt holes, and a nut that is screwed to the bolt. About.
[0002]
[Prior art]
A bolt fastening structure in which a sub-frame as a metal frame is fastened to a main frame of an automobile as a support member by using a bolt inserted through the collar and a nut screwed into the bolt is conventionally known. In such a structure, there is an advantage that the fastening axial force of the bolt can be sufficiently secured by the collar, the bolt coupling strength is increased, and it is effective in preventing the loosening thereof.
[0003]
[Problems to be solved by the invention]
However, in the conventional bolt fastening structure, as shown in FIG. 10, the collar C ′ having the outward flange portion f at the base end is connected to the bolt hole h of one flat wall portion Wd of the subframe (for example, the vertical frame 1). Further, it is inserted into the frame 1, the end of the collar C 'is butted against the inner surface of the other flat wall Wu, and the flange f is welded to the frame 1 (that is, the flat wall Wd). For this reason, the special construction of the flange portion f not only increases the weight and complexity of the collar itself, but also increases the weight of the welded portion of the subframe, which lowers the strength and tends to cause cracks. There is a problem that a characteristic effect formed with a tensile material cannot be expected. Further, since a welding process for the collar is essential, there is a problem that production efficiency is lowered and cost is increased.
[0004]
In addition, in order to avoid the problem of the strength reduction accompanying the said welding, when the board thickness of a sub-frame is made specially thick or a reinforcement material is provided specially, another problem that cost and weight increase will arise so much.
[0005]
The present invention has been made in view of such circumstances, and is capable of fixing a collar firmly and efficiently to a closed cross-section metal frame at low cost without using welding means. An object of the present invention is to provide a frame combination and an assembly method thereof.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention provides a metal frame having a hollow closed cross-sectional structure having a pair of opposed flat wall portions, and predetermined attachments corresponding to bolt holes respectively formed in the both flat wall portions. A collar that is disposed at a position and that crosses the hollow portion of the frame, and can be fastened to the support member using at least a bolt that penetrates the collar and both bolt holes and a nut that is screwed to the bolt. In the collar-frame combination, the collar is sandwiched between the opposing surfaces of the pair of flat wall portions at the mounting position, and the metal frame enters the collar from the opening end of the frame to the mounting position. The bolt hole opening edge portion of at least one flat wall portion is engaged with the opening edge of the collar at the mounting position to fix the collar to the metal frame. Claws, characterized in that it is integrally formed by burring to said at least one of the flat wall portion.
[0007]
According to the above feature of the first aspect, the collar is sandwiched between the opposing surfaces of the two flat wall portions at the mounting position (that is, both end surfaces in the axial direction of the collar are in close contact with the opposing inner surfaces of the two flat wall portions, respectively. The movement of the collar in the axial direction is restricted by its clamping action, and in addition, the engagement claw portion formed by burring is engaged with the opening edge of the collar, Since the lateral movement of the collar is regulated, the collar is reliably regulated in all directions at the mounting position. Therefore, the collar can be firmly and efficiently fixed at a low cost without using welding means, and there is no heat input by welding to the frame. Strength reduction due to annealing around the part) is avoided. In addition, since the collar itself can have a simple cylindrical shape without a flange, the weight of the collar can be reduced and the cost can be reduced.
[0008]
According to a second aspect of the present invention, in addition to the feature of the first aspect of the invention, an annular step portion recessed from an end surface of the collar is formed at the opening edge of the collar, and the engagement step is formed in the annular step portion. It is characterized in that at least a part of the claw portion is accommodated.
[0009]
According to the above feature of the second aspect, since the engaging claw portion is prevented from projecting from the inner peripheral surface of the collar, the backlash between the collar and the bolt is made as small as possible even by the special provision of the engaging claw portion. it can.
[0010]
According to a third aspect of the invention, in addition to the features of the first or second aspect of the invention, the supporting member is a main frame of an automobile, and the metal frame is a longitudinal frame made of a high-strength steel plate of an automobile subframe. It is a frame.
[0011]
According to the above feature of claim 3, the vertical frame of the sub-frame is made of a high-strength steel plate, and as described above, the collar can be fixed to the vertical frame without welding, and the strength is reduced due to the heat input of welding. Combined with what can be avoided, the rigidity strength of the subframe and the strength of the connection of the subframe to the main frame are effectively increased.
[0012]
According to a fourth aspect of the present invention, in the method for assembling the color / frame combination according to any one of the first to third aspects, the color placement surface and a frame placement surface that is one step lower than the color placement surface. Using a work support base arranged side by side, the metal frame with the pair of flat wall portions arranged vertically on the frame mounting surface of the work support base, the frame opening end opens to the collar mounting surface side And the inner surface of the flat wall portion on the lower side of the frame is placed so as to be flush with the collar placing surface, and the collar is placed in an upright position on the collar placing surface. The collar push-in means provided on the support base is used to hold the outer periphery of the collar in an upright position, and the collar is pushed into the metal frame from its opening end while being slidably contacted on the collar mounting surface. Stop at the next position Then, the tapered positioning pin provided on the workpiece support base is inserted into the collar from below the frame mounting surface through the bolt hole of the lower flat wall portion so that the collar is correctly positioned at the mounting position. In the positioning state, the upper flat wall portion is subjected to burring processing from above the frame, and the engaging claw portion that engages with the collar opening edge is integrally formed at the bolt hole opening edge portion of the upper flat wall portion. It is characterized by doing.
[0013]
According to the above feature of the present invention, after the metal frame is placed on the frame placement surface of the work support base and the collar is placed on the collar placement surface in the standing posture, the standing posture is set by the color pushing means. Holding the outer periphery of the collar, sliding the collar on the collar mounting surface, pushing it into the metal frame from its opening end, stopping at the mounting position, and then tapering positioning pins on the work support base After the collar is correctly positioned at the mounting position, the burring process is performed on the upper flat wall portion from above the frame, and the bolt hole opening edge of the upper flat wall portion is engaged with the opening edge of the collar. It is possible to easily and quickly assemble and fix the collar to the metal frame simply by integrally forming the pawl portion.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.
[0015]
1 to 8 show a first embodiment of the present invention, in which FIG. 1 is a plan view showing a subframe of an automobile, and FIG. 2 is an enlarged view of line 2-2 in FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1 and a partially enlarged view thereof. FIG. 4 is an overall longitudinal sectional view showing an example of an assembling apparatus. FIG. 5 is a sectional view taken along line 5-5 in FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 4, FIG. 7 is a process explanatory view corresponding to FIG. 4 for explaining the first half of the color assembling process, and FIG. 8 is a color assembling process. FIG. 5 is a process explanatory diagram corresponding to FIG. 4 for explaining the latter half of the process. FIG. 9 is a sectional view corresponding to FIG. 2 showing a second embodiment.
[0016]
First, a first embodiment of the present invention will be described with reference to FIGS. The body frame of the automobile includes a main frame MF that constitutes a main skeleton portion thereof, and a sub frame SF that is used for mounting heavy components such as an engine (not shown) on the main frame MF.
[0017]
The sub-frame SF has a frame structure in which a pair of left and right vertical frames 1 made of a pair of left and right vertical frames 1 and a pair of front and rear high-strength steel plates 2 integrally joined to each other. A collar C used for bolting the vertical frame 1 to the main frame MF is integrally coupled to an intermediate portion of each vertical frame 1 near the front and rear ends. Thus, the main frame MF constitutes the support member of the present invention, the vertical frame 1 constitutes the metal frame of the present invention, and the combination J of the color C and the vertical frame 1 constitutes the color / frame combination of the present invention. To do.
[0018]
Next, the structure of the combined body J will be described.
[0019]
Each of the left and right vertical frames 1 is formed in a hollow closed cross-sectional structure (in the illustrated example, a pipe shape having a substantially rectangular cross section) and has front and rear ends opened, and at least a collar mounting position from the front and rear open ends O. A predetermined section (substantially all sections in the illustrated example) up to Xc has a pair of upper and lower flat wall portions Wu and Wd parallel to each other. The upper and lower flat wall portions Wu, Wd have a pair of upper and lower bolt holes h that are arranged on the same axis as the collar C at the mounting position Xc and crossing the hollow portion of the vertical frame 1 in the vertical direction. , H are formed respectively.
[0020]
Thus, when the sub-frame SF is coupled to the main frame MF, the bolt B is inserted into the bolt hole h and the collar C of the vertical frame 1 of the sub-frame SF, and the nut N is screwed into the bolt B. Tighten to. 2 and 3, w is a washer.
[0021]
Next, mainly referring to FIGS. 2 and 3, the structure for connecting the color C to the vertical frame 1 will be described in detail.
[0022]
The collar C is in an upright posture at the mounting position Xc, and the upper and lower end surfaces are in close contact with the opposing inner surfaces of the pair of upper and lower flat wall portions Wu, Wd of the vertical frame 1, and the flat wall portions Wu, Wd. Is sandwiched between the opposing surfaces.
[0023]
The vertical frame 1 keeps the collar C upright from the front and rear opening ends O (that is, with the upper and lower end surfaces of the collar C slidably contacting the opposing inner surfaces of the pair of upper and lower flat wall portions Wu, Wd). It forms in the form which can approach to the attachment position Xc. For example, in the illustrated example, the mounting position Xc of the collar C is set at a position where the vertical frame 1 is relatively close to the front and rear opening ends O, and the section between the opening end O and the mounting position Xc is substantially linear. Is formed.
[0024]
At least one of the upper and lower (upper in the illustrated example) flat wall portion Wu has a bolt hole h opening edge engaged with the upper opening edge of the collar C at the mounting position Xc to fix the collar C to the vertical frame 1. The engaging claw portion 3 is formed integrally. In the illustrated example, the engaging claw portion 3 is formed into an annular downward flange shape by burring processing on the peripheral portion of the bolt hole h of the flat wall portion Wu.
[0025]
At the upper opening edge of the collar C, an annular step portion Cs is formed which is recessed by one step from the upper end surface of the collar C, and at least a part of the engaging claw portion 3 (all in the illustrated example) is formed in the annular step portion Cs. Is stored. According to the special provision of the annular step portion Cs, the engagement claw portion 3 is prevented from projecting from the inner peripheral surface of the collar C, and the presence of the engagement claw portion 3 also prevents the collar C from being connected to the bolt B. There is an advantage that the fitting play can be made as small as possible.
[0026]
In addition, chamfering Cr is formed on the outer peripheral edges of the upper and lower ends of the collar C as illustrated in an enlarged manner in FIG. 3, and at least the upper and lower flat wall portions are also formed on the inner peripheral edges of the front and rear opening ends O of the vertical frame 1. A chamfer 1r is formed at the edge portions of Wu and Wd.
[0027]
Next, an example of an assembly apparatus for the color / frame combination J will be described with reference to FIGS.
[0028]
This apparatus has a work support base S installed on a fixed base (not shown). On the upper surface of the work support base S, there is a horizontal color placement surface Sc and one step from the color placement surface Sc. The lowered frame mounting surface Sf is juxtaposed, and the step St between the mounting surfaces Sc and Sf is set to be substantially the same as the plate thickness of the lower flat wall portion Wd of the vertical frame 1.
[0029]
The workpiece support S is provided with a pair of left and right support walls Ss that are erected on both the left and right sides of the frame placement surface Sf so as to fit the vertical frame 1 therebetween, and further protrude from the frame placement surface Sf. An upwardly tapered positioning pin Pd capable of moving up and down between the operating position and the standby position immersed from the same surface Sf, and its lifting drive means 4 are provided.
[0030]
The vertical frame 1 on the frame placement surface Sf is held on one side of the work support base S on the color placement surface Sc side by holding the collar C placed in a standing posture on the color placement surface Sc. A collar pushing means D for pushing in from the opening end O is provided inside. The push-in means D is a holding member 5 having a semicircular arc-shaped engaging recess 5a that can hold the outer peripheral surface of the collar C, and is driven forward and backward with respect to the vertical frame 1 on the frame mounting surface Sf. The forward / backward drive means 6 can be configured.
[0031]
Further, above the workpiece support S, a movable die A for burring processing is disposed corresponding to the positioning pin Pd. The movable mold A is formed of a lifting support 7 that is supported by a fixed base (not shown) and can be driven up and down, and a downward stepped pin-shaped molding that is fixed to the lifting support 7 and can enter the collar C. A punch 8 and a ring-shaped holder 10 that is supported by the elevating support 7 via a cylindrical elastic body 9 and slidably surrounds the molding punch 8 are provided. The vertical frame 1 (upper flat wall portion Wu) on the surface Sf can be in contact with or separated from the upper surface.
[0032]
Next, a procedure for assembling the color C to the vertical frame 1 using the assembly apparatus will be described with reference to FIGS.
[0033]
First, as shown in FIG. 7A, the lower flat wall portion Wd of the vertical frame 1 is placed on the frame placement surface Sf of the work support base S, while the collar in a standing posture on the collar placement surface Sc. C is placed manually or automatically by a setting device (not shown) and is held by the holding member 5 of the color push-in means D. In this case, the vertical frame 1 after setting has the lower end edge of the opening end O abutted on the step St between the collar mounting surface Sc and the frame mounting surface Sf, and the inner surface of the lower flat wall portion Wd is It is continuous with the color mounting surface Sc.
[0034]
The upper and lower flat wall portions Wu, Wd of the collar C set as described above are previously drilled with bolt holes h, h at positions corresponding to the mounting position Xc. The bolt hole h of the flat wall portion Wu is smaller than the normal inner diameter of the bolt hole h (that is, the inner diameter of the bolt hole h of the lower flat wall portion Wd) in anticipation of the burring formation of the engaging claw portion 3 described later. It is formed. An annular step Cs that is recessed by one step from the upper end surface of the collar C is formed in advance on the upper opening edge of the collar C by machining or the like.
[0035]
Next, as shown in FIG. 7B, the holding frame 5 of the collar push-in means D is advanced, and the vertical frame C is slidably contacted on the collar placement surface Sc with the collar C held up by the holding member 5. 1 is pushed in from the opening end O, and the pushing operation is stopped as the collar C reaches the mounting position Xc. At the time of this pushing, the upper and lower flat wall portions Wu of the collar C are formed by the chamfering Cr formed at the outer peripheral edges of the upper and lower ends of the collar C and the chamfering 1r formed at the opening edge of the opening end O of the vertical frame 1. , The entry between Wd is reasonably and smoothly made, and after the entry, the collar C maintains its standing posture and its upper and lower ends are slidably contacted with the inner surfaces of the upper and lower flat wall portions Wu and Wd, Move to the mounting position Xc.
[0036]
Next, as shown in FIG. 7C, the positioning pin Pd provided on the work support S is inserted into the collar C from below the frame mounting surface Sf through the bolt hole h of the flat wall portion Wd on the lower side. The collar C is correctly positioned at the mounting position Xc.
[0037]
Thereafter, as shown in FIG. 8D, the movable mold A is lowered in the positioning state of the collar C, and the elastic body 9 of the movable mold A is compressed and deformed. The upper flat wall portion Wu of the frame 1 is crimped and clamped, and the peripheral portion of the bolt hole h of the flat wall portion Wu is moved by the stepped molding punch 7 of the movable mold A that enters the collar C in this clamped state. It is bent and deformed over the entire circumference so as to be pushed into the collar C immediately below. According to such burring molding (caulking) on the peripheral edge of the bolt hole h of the flat wall portion Wu, the bolt hole h opening edge of the flat wall portion Wu has an annular shape that engages with the opening edge of the collar C. The downward flange-like engagement claw portion 3 is integrally formed, and the connecting operation of the collar C to the vertical frame 1 is completed.
[0038]
Thus, the collar C that has been joined to the vertical frame 1 is sandwiched between the opposing surfaces of the upper and lower flat wall portions Wu and Wd at the mounting position Xc (that is, both end surfaces in the axial direction of the collar C are both The flat wall portions Wu and Wd are in close contact with the inner surfaces facing each other), and the axial movement of the collar C is restricted by the clamping action, and in addition, the burring-shaped engagement described above Since the claw portion 3 engages with the opening edge of the collar C, the movement of the collar C in the lateral direction is restricted. Therefore, the movement of the collar C in the mounting position Xc is reliably restricted in the vertical direction. It is firmly fixed to the frame 1.
[0039]
Therefore, the collar C can be firmly and efficiently fixed to the vertical frame 1 at low cost without using welding means as in the prior art, and the frame 1 has no heat input due to welding. Problems (reduced strength due to annealing around the weld) are avoided. Further, since the collar C itself can have a simple cylindrical shape without a flange portion, it is advantageous in reducing the weight of the collar C and cost reduction.
[0040]
FIG. 9 shows a second embodiment of the present invention. In this embodiment, the annular step Cs for accommodating the engaging claw as in the previous embodiment is not formed on the upper opening edge of the collar C, and the collar C has the same inner diameter over the entire length. . Therefore, in this embodiment, the structure of the collar C is further simplified and the cost is reduced.
[0041]
As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention. For example, in the embodiment, the main frame MF of the automobile is shown as the support member, and the vertical frame 1 of the subframe SF is shown as the metal frame of the hollow closed cross-section structure. However, the present invention is not limited to the various embodiments. The present invention is applicable to a connecting structure between a metal pipe frame with a collar and a support member to which the metal pipe frame is bolted.
[0042]
Moreover, in the said Example, although the engaging claw part 3 for fixing the collar C was burring-molded in the annular downward flange shape in the bolt hole h peripheral part of the upper flat wall part Wu, in this invention, it showed. In addition to or instead of this engaging claw portion 3, an annular upward flange-like engaging claw portion may be burring-molded at the periphery of the bolt hole h of the lower flat wall portion Wd. Further, the engaging claw portions may not be annular, but may be constituted by a plurality of engaging claw pieces arranged at intervals in the circumferential direction of the bolt hole.
[0043]
【The invention's effect】
As described above, according to the present invention, the collar is sandwiched in the axial direction between the opposed surfaces of the pair of flat wall portions of the metal frame having a hollow closed cross-sectional structure, and at least one flat wall portion is burring processed. The engaging claw part formed in this way is engaged with the collar opening edge, so that the collar can be reliably controlled in the omnidirectional movement at its mounting position, and therefore the collar can be attached to the metal frame without using welding means. In addition, the frame can be firmly and efficiently fixed at low cost, and since there is no heat input by welding to the frame, problems due to heat input (a decrease in strength due to annealing around the welded portion) can be avoided. In addition, since the collar itself can be a simple cylindrical shape, it can contribute to the weight reduction and cost saving of the collar.
[0044]
According to a second aspect of the present invention, an annular step portion recessed from an end surface of the collar is formed at the opening edge of the collar, and at least a part of the engaging claw portion is accommodated in the annular step portion. Therefore, the engagement claw portion is prevented from projecting from the inner peripheral surface of the collar, and the backlash between the collar and the bolt can be minimized as much as possible by the special provision of the engagement claw portion.
[0045]
In particular, according to the invention of claim 3, the vertical frame of the sub-frame as the metal frame is made of a high-strength steel plate, and the collar can be fixed to the vertical frame without welding, and the strength due to the heat input of welding. Combined with being able to avoid the decrease, it is possible to effectively increase the rigidity strength of the subframe and the coupling strength of the subframe to the main frame.
[0046]
In particular, according to the invention of claim 4, after the metal frame is placed on the frame placement surface of the work support base and the collar is placed in the standing posture on the collar placement surface, the collar is pushed up by the color pushing means. Hold the outer periphery of the collar of the posture, press the collar into the metal frame from its opening end while sliding on the collar mounting surface, stop at the mounting position, then taper positioning of the work support base After the collar is correctly positioned at the mounting position by the pin, the upper flat wall portion is subjected to burring from above the frame, and the bolt hole opening edge of the upper flat wall portion is engaged with the opening edge of the collar. The collar can be easily and quickly assembled and fixed to the metal frame simply by integrally forming the engaging claw.
[Brief description of the drawings]
FIG. 1 is a plan view showing a subframe of an automobile according to a first embodiment of the present invention. FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. FIG. 4 is a partially enlarged view of the assembly apparatus. FIG. 5 is a sectional view taken along line 5-5 in FIG. 4. FIG. 6 is a sectional view taken along line 6-6 in FIG. FIG. 8 is a process explanatory diagram corresponding to FIG. 4 for explaining the first half of the assembly process. FIG. 8 is a process explanatory diagram corresponding to FIG. 4 for explaining the second half of the color assembly process. FIG. 10 is a sectional view corresponding to FIG. 2 showing an example. FIG. 10 is a sectional view corresponding to FIG.
B ... bolt C ... collar Cs ... annular step D ... collar push-in means h ... bolt hole J ... collar / frame combination MF ... mainframe (Support member)
N ··· Nut O ··· Opening end Pd ··· Positioning pin SF ··· Sub-frame S ··· Work support base Sc · Color placement surface Sf · Frame placement surface Wd ... Flat wall part Wu ... Flat wall part Xc ... Mounting position 1 ... Vertical frame (metal frame) of the subframe
3 .... engagement claw

Claims (4)

Corresponding to a metal frame (1) having a hollow closed cross-sectional structure having a pair of opposing flat wall portions (Wu, Wd) and bolt holes (h, h) formed in both flat wall portions (Wu, Wd). A collar (C) disposed at a predetermined mounting position (Xc) and crossing the hollow portion of the frame (1),
It can be fastened to the support member (MF) using at least the bolt (B) passing through the collar (C) and both bolt holes (h, h) and the nut (N) screwed into the bolt (B). In a color frame combination that is
The collar (C) is sandwiched between opposing surfaces of the pair of flat wall portions (Wu, Wd) at the attachment position (Xc),
The metal frame (1) is formed in a form capable of entering the collar (C) from the opening end (O) of the frame (1) to the mounting position (Xc),
The bolt hole (h) opening edge of at least one flat wall (Wu) is engaged with the opening edge of the collar (C) at the mounting position (Xc) and the collar (C) is attached to the metal frame. An engagement claw portion (3) fixed to (1) is integrally formed by burring with respect to the at least one flat wall portion (Wu). An annular step (Cs) that is recessed from the end face of the collar (C) is formed at the opening edge of the collar (C), and the engagement claw (3) of the engagement claw (3) is formed in the annular step (Cs). 2. The color frame combination according to claim 1, wherein at least a part thereof is accommodated. The support member (MF) is a main frame of an automobile, and the metal frame (1) is a vertical frame made of a high-strength steel plate of an automobile sub-frame (SF). Or the color frame combination as described in 2. In the assembly method of the color frame combination in any one of Claims 1-3,
Using a work support (S) in which a color placement surface (Sc) and a frame placement surface (Sf) that is one step lower than the color placement surface (Sc) are provided,
The metal frame (1) in which the pair of flat wall portions (Wu, Wd) are arranged vertically on the frame mounting surface (Sf) of the work support (S) has a frame opening end (O). The inner surface of the flat wall portion (Wd) on the lower side of the frame (1) that is open on the color mounting surface (Sc) side and the inner surface of the color mounting surface (Sc) is flush with the color mounting surface (Sc); Placing the collar (C) in an upright position on the collar placing surface (Sc);
A collar push-in means (D) provided on the work support (S) holds the outer periphery of the collar (C) in a standing posture, and the collar (C) is slid on the color placement surface (Sc). While pressing, from the opening end (O) into the metal frame (1) while contacting, stop at the mounting position (Xc),
Next, a taper-shaped positioning pin (Pd) provided on the work support (S) is inserted into the collar (C) from below the frame mounting surface (Sf) in the bolt hole of the lower flat wall (Wd). (H) rush through to position the collar (C) at the mounting position (Xc) correctly;
In the positioning state, burring is performed on the upper flat wall (Wu) from above the frame (1), and the bolt (h) opening edge of the upper flat wall (Wu) A method for assembling a collar-frame combination, wherein the engaging claw (3) that engages with the opening edge is integrally formed.

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