Rolling tool and method for closing an opening of a cylindrical element using the same

Abstract

Roll-forging tool (10) used for upsetting an opening (50a, 112a) of a cylindrical element (50, 112) by a roll-forging process, wherein the roll-forging tool (10) comprises: a bearing shaft (11) connected to a drive body; a plurality of rotating shafts (12, 13) extending in directions orthogonal to the bearing shaft (11); and essentially disc-shaped upsetting sections (20), each of which is attached to each of the rotating shafts (12, 13), wherein each of the essentially disc-shaped upsetting sections (20) has a first surface (20a) which performs an upsetting action and a second surface (20b) on the side opposite in the thickness direction, wherein the first surface (20a) has an annular first upsetting section (21) having a minimum thickness and a maximum outer diameter, a third disc-shaped upsetting section (23) having a maximum thickness and a minimum outer diameter,and an annular second compression section (22) having a thickness between the minimum thickness and the maximum thickness and an outer diameter between the outer maximum diameter and the outer minimum diameter, a first annular inclined surface (24) provided at a boundary between the annular first compression section (21) and the annular second compression section (22), and a second annular inclined surface (25) being a curved surface provided at a boundary between the annular second compression section (22) and the third disc compression section (23), wherein the second annular inclined surface (25) is brought into contact with an outer circumferential edge of an annular surface (52a) located at a distal end of the opening (50a, 112a) of the cylindrical element (50, 112) when the opening (50a, 112a) is compressed by rolling.

Description

Field of invention

[0001] The present invention relates to a rolling swaging tool used for swaging an opening of a cylindrical element, and to a method for closing the opening of the cylindrical element with a closing element using the rolling swaging tool. Description of the related technique

[0002] A gas generator for an airbag device, in which an ignition device is attached to one end of a cylindrical housing and a diffuser section equipped with a gas discharge opening is attached to the other end section, is widely used. (a) in Fig. 10 of the present invention represents a Fig. 1 of JP-A No. 2011-157.025 represents the gas generator shown. As in (a) in Fig. Figure 10 shows a detonator 16, which serves as an ignition device, attached to one end 10a of a cylindrical housing 10. The detonator 16 is a known electric detonator, which is attached to a sleeve 17, and an ignition section 16a, which has an ignition element, projects from the sleeve 17. Overview of the invention

[0003] The present invention provides a roll-up tool or a roll-crimp tool used for upsetting or crimping an opening of a cylindrical element according to a roll-up process or a roll-crimp process, wherein the roll-up tool or the roll-crimp tool comprises: a bearing shaft connected to a drive body; a plurality of rotating shafts extending in directions orthogonal to the bearing shaft; and essentially disc-shaped compression sections, each attached to one of the rotating shafts, wherein each of the essentially disc-shaped upsetting sections has a first surface which performs an upsetting or crimping and a second surface on the side opposite in the thickness direction, where the first surface has a ring-shaped first compression section, which has a minimum thickness and a maximum outer diameter, a third disc compression section, which has a maximum thickness and a minimum outer diameter, and a ring-shaped second compression section having a thickness between the minimum thickness and the maximum thickness and an outer diameter between the outer maximum diameter and the outer minimum diameter, a first annular, inclined surface provided at a boundary between the annular first compression section and the annular second compression section, a second annular, inclined surface, which is a curved surface provided at a boundary between the annular second compression section and the third disc compression section, and wherein the second annular, inclined surface is brought into contact with an outer circumferential edge of an annular surface located at a distal end of the opening of the cylindrical element when the opening is upsetting or crimped by rolling.

[0004] Furthermore, the present invention provides a method for closing an opening of a cylindrical housing of a gas generator with a closing element in the form of a flat plate using the roll-up tool or the roll-crimp tool, wherein the cylindrical housing has a stepped surface formed radially on an inner side of a circumferential wall on the side of one of the openings, and a circumferential wall located at a distal end extending from the stepped surface to the opening, wherein the closing element in the form of a flat plate is a disc comprising a first surface, a second surface on the side opposite the first surface in the thickness direction and a circumferential surface between the first surface and the second surface, and having such a shape and size that it can be inserted from the opening of the cylindrical housing and brought into contact with the stepped surface, and wherein the method for closing the opening of the cylindrical housing with the closing element in the form of a flat plate includes: Inserting the locking element as a first step from the opening of the cylindrical housing to be closed, until the first surface rests against the stepped surface; and Upsetting or crimping as a second step using the roll upsetting tool or the roll crimping tool by rotating the bearing shaft, while the annular first upsetting section, the first annular inclined surface and the annular second upsetting section continuously in this sequence bear against an outer surface of the circumferential wall of the cylindrical housing located at the distal end and while the second annular inclined surface bears against an outer circumferential edge of an annular surface of the circumferential wall located at the distal end.

[0005] Furthermore, the present invention provides a method for closing an opening of a cylindrical housing of a gas generator with an igniter in the form of a flat plate using the roll forming tool or the roll crimping tool, wherein the cylindrical housing has a stepped surface formed radially on an inner side of a circumferential wall on the side of one of the openings, and a circumferential wall located at a distal end extending from the stepped surface to the opening, where the detonator has a detonator body comprising a firing section and an electrically conductive pin extending axially opposite the firing section, and a detonator collar surrounding part of the main body of the detonator, wherein the detonator collar has an annular plate section projecting radially outwards and having an outer maximum diameter, and a circumferential wall from which the annular plate section is excluded, wherein the annular plate section has such a shape and size that it can be inserted from the opening of the cylindrical housing and brought into contact with the stepped surface, The method for closing the opening of the cylindrical housing with the detonator includes: Inserting the detonator as a first step from the opening of the cylindrical housing to be sealed, until the annular plate section of the detonating collar rests against the stepped surface; and Upsetting or crimping as a second step using the roll upsetting tool or the roll crimping tool by rotating the bearing shaft, while the annular first upsetting section, the first annular inclined surface and the annular second upsetting section continuously in this sequence bear against an outer surface of the circumferential wall of the cylindrical housing located at the distal end and while the second annular inclined surface bears against an outer circumferential edge of an annular surface of the circumferential wall located at the distal end. List of characters

[0006] The present invention will be better understood from the detailed description below and the accompanying drawings, which serve only for illustration and therefore do not limit the present invention and in which the following applies: [ Fig. 1] Fig. Figure 1 shows a cross-sectional view of a roll forming tool of the present invention, in which a forming section is cut in a radial cross-section; [ Fig. 2] Fig. 2 shows an enlarged partial view of the Fig. 1 depicted roll forming tool; [ Fig. 3] Fig. 3 shows in (a) a top view of the in Fig. 1 shown as a roll-up tool and (b) a top view of a roll-up tool of a different embodiment than that shown in Fig. 1 is shown; [ Fig. 4] Fig. Figure 4 shows an illustrative view of a first step of a method for closing an opening of a cylindrical housing using a roll forming tool and a closing element in the form of a flat plate; [ Fig. 5] Fig. Figure 5 shows an explanatory view of a second step of a method for closing an opening of a cylindrical housing using the roll forming tool and the closing element in the form of a flat plate; [ Fig. 6] Fig. Figure 6 shows an explanatory view of a third step of a method for closing an opening of a cylindrical housing using the roll forming tool and the closing element in the form of a flat plate; [ Fig. 7] Fig. Figure 7 shows an explanatory view of a fourth step of a method for closing an opening of a cylindrical housing using the roll-up tool and the closing element in the form of a flat plate; [ Fig. 8] Fig. 8 shows in (a) a partially enlarged cross-sectional view of the in Fig. 7 the design shown and in (b) a partially enlarged cross-sectional view to explain a prior art in the fourth step, which is shown in Fig. 7 is shown; [ Fig. 9] Fig. Figure 9 shows an axial cross-sectional view when an opening of a cylindrical casing is closed using a roll-up tool and a detonator; and [ Fig. 10] Fig. Figure 10 (a) shows an axial cross-sectional view of a known gas generator and (b) shows a partial cross-sectional view to explain a manufacturing step shown in (a). Detailed description of the invention

[0007] In JP-A No. 2011-157.025, before the detonator 16 (the ignition sleeve) 17 ) at one end 10a of the cylindrical housing 10 is attached, leaving a gap between one end 10a and the ignition sleeve 17 , as in (b) in Fig. 10 shown. The detonator 16 It falls off if left unchanged, and therefore one end will be 10a of the cylindrical housing 10 reduced in diameter to accommodate the area shown in (a) in Fig. to achieve the state shown in 10.

[0008] JP-A No. 2011-157,025 does not disclose a specific machining process; however, it is known that a roll-up forming process is used in a manufacturing process for a gas generator (JP-A No. 2007-223,485, JP-A No. 2008-241,186), and the roll-up forming process can also be used as a method for reducing the diameter of one end 10a of the cylindrical housing 10 be used.

[0009] If that's one end 10a of the cylindrical housing 10 , which in (b) in Fig. 10 is compressed under a specific compression condition by rolling, as in (a) in Fig. As shown in 10, part or all of the outer surface of one end can be 10a extend in the direction of the X axis, and a projection can be formed.

[0010] If such a protrusion is left unchanged, there is a possibility that the nozzle section of an airbag will be damaged by the protrusion, rendering the airbag unusable if the airbag separates the gas generator from the diffuser section. 12 covered and one end 10a This has been achieved. With conventional roll forming tools, it is difficult to completely rule out this possibility.

[0011] Although the problem can be solved by cutting off the protrusion, this adds a step to the removal process.

[0012] The present invention provides a roll-up tool or a roll-crimp tool for roll-up or roll-crimping an opening of a cylindrical element and a method for closing the opening of the cylindrical element using the roll-up tool or the roll-crimp tool.

[0013] When the opening of the cylindrical element is compressed by rolling with the roll forming tool of the present invention, the circumferential wall near the opening is gradually reduced in diameter (deforms so that the outer diameter decreases).

[0014] In this process, there is a case where part or all of the outer surface of the end section of the cylindrical element extends in the axial direction, thus forming a projection that extends from an outer circumferential edge in the direction of the X axis. However, if the outer circumferential edge of a distal end section of the opening is brought into contact with a second inclined surface of the roll-up tool, and roll-up is performed in this state, it is unlikely that the projection will form on the end section on the side of the outer surface of the cylindrical element, but it is likely that it will form on the end section on the side of the inner surface of the cylindrical element. This prevents the projection from forming on the end section on the side of the outer surface of the cylindrical element.

[0015] In the roll forming tool according to the present invention, the ratio (t / r) of a radius (r) of an incircle for the second annular, inclined surface, which is the curved surface, and a thickness (t) of the opening of the cylindrical element, which is a target of the roll forming, is 2 to 9.

[0016] The ratio t / r is preferably in this range, as this easily prevents a protrusion from forming on the end section on the side of the outer surface of the cylindrical element.

[0017] In the rolling upsetting tool according to the present invention, the number of rotating shafts is preferably 2 or 3 and the number of substantially disc-shaped upsetting sections is preferably 2 or 3.

[0018] Using such a rolling compression tool also increases the working speed and ensures uniform compression.

[0019] When the roll upsetting is carried out using the roll upsetting tool of the present invention, even if the opening of the cylindrical housing is closed with a closing element (a disc), a projection that extends outwards in the direction of axis X is not formed on an annular surface located at a distal end on the side of an outer circumferential wall surface (an outer circumferential edge) of a circumferential wall located at a distal end, but is formed on the annular surface located at the distal end only on the side of an inner circumferential wall surface of the circumferential wall located at the distal end.

[0020] This prevents the airbag from getting caught on the protrusion and being torn apart, even if the gas generator is covered by the airbag.

[0021] A method for closing the opening of the cylindrical housing with the closing element using the rolling compression tool of the present invention can be described as a method for closing an opening of a cylindrical housing, for example using the second closing element. 14 of the in Fig. 1 and Fig. 2 of the gas generator shown in JP-A No. 2011-225.069, of the first closing element 14 of the in Fig. 1 of JP-A No. 2011-218942 depicted gas generator and the second enclosure 16 of JP-A No. 2007-30,656 in Fig. 1 gas generator shown 10 , of the in Fig. 2 gas generators shown 10a and of the in Fig. 3 gas generators shown 10b be used.

[0022] In the case of a stepped surface of the cylindrical housing, it can be any of the following: an annular, stepped surface formed continuously in the circumferential direction on the inner circumferential surface of the cylindrical housing; an annular, convex section achieved by the inner circumferential surface of the cylindrical housing projecting continuously in the circumferential direction; and a discontinuous, convex section consisting of a plurality of projections arranged discontinuously in the circumferential direction.

[0023] When the roll forming is carried out using the roll forming tool of the present invention, even if the opening of the cylindrical housing is closed with a detonator, a projection projecting in the direction of axis X is not formed on the annular surface located at the distal end on the side of the outer circumferential wall surface (the outer circumferential edge) of the circumferential wall located at the distal end, but is formed on the annular surface located at the distal end only on the side of the inner circumferential wall surface of the circumferential wall located at the distal end.

[0024] This prevents the airbag from getting caught on the protrusion and being torn apart, even if the gas generator is covered by the airbag.

[0025] A method for closing the opening of the cylindrical housing with the closing element using the rolling compression tool of the present invention can be used for: (I) a gas generator in which one end of a cylindrical housing is closed with a diffuser section and a breakable plate is attached to one end, the diffuser section being fitted with a gas discharge opening (which is closed with a sealing strip) and the other end section being closed with an igniter, as for example in Fig. 1 of JP-A No. 2015-89760, Fig. 1 of JP-A No. 2014-156.207 and Fig. 1 of JP-A No. 2006-306.218 shown; and (II) a gas generator in which one end is closed, the other end section is closed with an igniter and a gas discharge opening is provided in a circumferential wall of a housing, such as in Fig. 1 of JP-A No. 2015-9666, Fig. 1 of JP-A No. 2014-144736 and Fig. 1 of JP-A No. 2014-94614 is shown.

[0026] In the case of a stepped surface of the cylindrical housing, it can be any of the following: an annular, stepped surface formed continuously in the circumferential direction on the inner circumferential surface of the cylindrical housing; an annular, convex section achieved by the inner circumferential surface of the cylindrical housing projecting continuously in the circumferential direction; and a discontinuous, convex section consisting of a plurality of projections arranged discontinuously in the circumferential direction.

[0027] The roll forming tool of the present invention is suitable for closing an opening of a cylindrical element together with another element.

[0028] When an opening of a cylindrical housing used in a gas generator for an airbag device is closed with a flat, plate-shaped closing element or an igniter using the rolling compression tool of the present invention, the opening is closed with a high degree of sealing.

[0029] The roll forming tool of the present invention is used to close an opening of a cylindrical element together with another element.

[0030] The rolling-up tool of the present invention is suitably used for closing an opening of a cylindrical housing used in a gas generator for an airbag device with a flat, plate-shaped closing element or an igniter. Therefore, the rolling-up tool is also used for a method of assembling a gas generator. Embodiments of the invention <walzstauchwerkzeug>

[0031] A in Fig. 1 shown roll forming tool 10 is used to upset the opening of a cylindrical element using a roll forming process.

[0032] The rolling compression tool 10 includes a bearing shaft 11 , which is connected to a drive unit (a motor or the like) not shown in the drawing, two rotating shafts 12 , 13 , which extend in a direction orthogonal to the bearing shaft 11 extend, and have an essentially disc-shaped compression section 20 , which is attached to each of the rotating shafts 12 , 13 appropriate.

[0033] The bearing shaft 11 It has a function for transmitting a rotary motion from the drive body to the rotating shafts 12 , 13 For example, a combination of several gears of different types can be used as a rotary mechanism to rotate the shaft. 12 and the rotating shaft 13 They will be provided in different directions.

[0034] The two essentially disc-shaped compression sections 20 They have the same shape. The compression section 20 It can be designed to be detachable from the rotating shaft and replaced as needed.

[0035] The bearing shaft 11 , the rotating shafts 12 , 13 and the compression section 20 are preferably made of stainless steel, iron or similar materials.

[0036] The essentially disc-shaped compression section 20 a first area 20a , which performs a compression and a second surface 20b on, which is a flat surface on the first surface 20a on the side opposite the thickness direction.

[0037] The first area 20a has a ring-shaped first compression section 21 , which has a minimum thickness and a maximum outer diameter, a third disc compression section 23 , which has a maximum thickness and a minimum outer diameter, and an annular second compression section 22 on, which has a thickness between the minimum thickness and the maximum thickness and an outer diameter between the outer maximum diameter and the outer minimum diameter.

[0038] An outer diameter of each of the annular first compression section 21 , of the ring-shaped second compression section 22 and the third disc compression section 23 is adapted according to the length of the closed section of the cylindrical element to be closed.

[0039] A thickness of each of the ring-shaped first compression section 21 , of the ring-shaped second compression section 22 and the third disc compression section 23 is such that, if a thickness of the third disc compression section 23 from the second area 20b Assuming a thickness of 1, the annular second compression section 22 from the second area 20b approximately 2 / 3 and a thickness of the ring-shaped first compression section 21 from the second area 20b approximately 1 / 3.

[0040] Although the thickness of the ring-shaped first compression section 21 Not subject to any particular restriction, it can essentially correspond to the thickness of the cylindrical element to be sealed.

[0041] middle of the ring-shaped first compression section 21 , of the ring-shaped second compression section 22 and the third disc compression section 23 agree.

[0042] A first ring-shaped, inclined surface 24 is located at a boundary between the ring-shaped first compression section 21 and the ring-shaped second compression section 22 provided. At the first ring-shaped, inclined surface 24 It can be a flat surface or a slightly curved surface.

[0043] An angle (an acute angle segment) between the first annular, inclined surface 24 and the ring-shaped first compression section 21 The angle is less than 90 degrees and can be adjusted according to the degree of deformation of the circumferential wall of the cylindrical element to be closed.

[0044] A second ring-shaped, inclined surface 25 , which is a curved surface, is formed at a boundary between the ring-shaped second compression section 22 and the third disc compression section 23 provided.

[0045] As in Fig. 2 shown, lies at the curved surface of the second ring-shaped, inclined surface 25 a ratio (t / r) of a radius (r) of an incircle for the second annular, inclined surface 25 and a thickness (t) of the opening of the cylindrical element, which is a target of the roll upsetting ( Fig. 4), preferably in a range of 2 to 9 and more preferably in a range of 3 to 5.5.

[0046] At the in Fig. 1 shown rolling upsetting tool 10 is essentially a disc-shaped compression section 20 each on the rotating shaft 12 and the rotating shaft 13 attached, which are arranged on the same line as in (a) in Fig. 3 shown.

[0047] The two compression sections 20 can be in relation to the rotational waves 12 , 13 Turn clockwise or counterclockwise.

[0048] The compression section 20 agrees with the in Fig. 1 and Fig. 2 shown compression section 20 agree.

[0049] The in (b) in Fig. 3 shown rolling upsetting tools 10A a bearing shaft 11 , which is connected to a drive unit (a motor or the like) not shown in the drawing, three rotating shafts 12 , 13 , 14 , which extend in directions orthogonal to the bearing shaft 11 extend and are evenly spaced in the circumferential direction, and the essentially disc-shaped compression section 20 on, which is rotatably attached to each of the three rotating shafts.

[0050] The three essentially disc-shaped compression sections 20 exhibit the same form and agree with those that are in Fig. 1 and Fig. 2 are shown, agree.

[0051] The number of compression sections 20 In the rolling upsetting tool of the present invention, the size and shape of the cylindrical element to be upset are adapted; however, if the cross-sectional shape in the width direction of the cylindrical element is circular, two or three upsetting sections are preferred. <Verfahren zum Verschließen mithilfe des Walzstauchwerkzeugs -1>

[0052] A method for closing an opening of a cylindrical housing using the in Fig. 1 and (a) in Fig. 3 shown roll forming tool 10 and a locking element are referred to Fig. 4 to Fig. 8 described.

[0053] A cylindrical housing 50 It has a circular cross-section in the width direction and includes a ring-shaped, stepped surface. 53 , radially on an inner side of a circumferential wall 51 on the side of an opening 50a is formed, and has a circumferential wall located at a distal end. 52 from the ring-shaped, stepped surface 53 to the opening 50a .

[0054] The ring-shaped, stepped surface 53 is caused by a difference in thickness between the circumferential wall 51 and the circumferential wall located at the distal end 52 achieved, and a thickness of the circumferential wall located at the distal end 52 is less than the thickness of the perimeter wall 51 , where the circumferential wall located at the distal end 52 is not provided.

[0055] In the case of the ring-shaped, stepped surface 53 It could be a ring-shaped, convex section located on the inner surface of the circumferential wall. 51 on the side of the opening 50a of the cylindrical housing 50 instead of in Fig. The form shown in section 4 is formed. In this case, a section from the ring-shaped, convex section to the opening corresponds to this. 50a the circumferential wall located at the distal end 52 , and a thickness of the circumferential wall located at the distal end 52 corresponds to the thickness of the perimeter wall 51 agree where the circumferential wall located at the distal end 52 is not provided.

[0056] The ratio (t / r) between the thickness (the thickness of the circumferential wall located at the distal end) 52 ) (t) of the opening 50a of the cylindrical housing and the radius (r) of the incircle for the curved surface of the second annular, inclined surface 25 of the compression section 20 The ratio is 2 to 9.

[0057] The cylindrical housing 50 is used in a gas generator and can be used, for example, in the one in Fig. 1 and Fig. 2 of JP-A No. 2011-225.069 shown gas generator, which is in Fig. 1 of JP-A No. 2011-218942 shown and the gas generator shown in JP-A No. 2007-30656 in Fig. 1 gas generator shown 10 , which in Fig. 2 gas generator shown 10a and the in Fig. 3 gas generators shown 10b be used.

[0058] In a locking element 70 It is a disc that has a first surface 71 , a second area 72 on the first area 71 in the opposite direction of thickness and a circumferential surface 73 between the first area 71 and the second area 72 contains.

[0059] The locking element 70 It has a shape and size that allow the closing element to be separated from the opening. 50a of the cylindrical housing 50 from is used and on the ring-shaped, stepped surface 53 is brought into the facility.

[0060] A thickness (T) of the closing element 70 is preferably smaller than a length (L) of the circumferential wall located at the distal end, and T / L is preferably 0.4 to 0.6. (First step)

[0061] As in Fig. As shown in 4, the closing element 70 from the opening 50a of the cylindrical housing to be closed 50 deployed until the first area 71 on the ring-shaped, stepped surface 53 is pending.

[0062] At this point, the circumferential area 73 of the locking element 70 slightly on the circumferential wall located at the distal end 52 or it lies radially opposite with a small gap in between. (Second step)

[0063] As in Fig. 5 and Fig. As shown in section 6, the rolling and shrinking tool is used. 10 rolling by rotating the support shaft 11 carried out while the ring-shaped first compression section 21 , the first ring-shaped, inclined surface 24 and the ring-shaped second compression section 22 in this sequence continuously on an outer surface of the circumferential wall located at the distal end 52 of the cylindrical housing 50 to be brought into the plant (the compression section) 20 against the opening 50a is pressed).

[0064] This compression in the second step creates an outer shape of the circumferential wall located at the distal end. 52 processed into a shape that resembles the outer shape of the ring-shaped first compression section 21 , the first ring-shaped, inclined surface 24 and the ring-shaped second compression section 22 corresponds.

[0065] Furthermore, as in Fig. 6 and Fig. 7 shows that in the compression step of the second step the compression is carried out in a state in which the rotating second annular, inclined surface 25 on an outer circumferential edge of the ring-shaped surface located at the distal end 52a the circumferential wall located at the distal end 52 is brought into the facility.

[0066] As in (b) in Fig. Figure 8 shows the movement when roll upsetting is performed with a roll upsetting tool that does not have a second annular, inclined surface. 25 features a metal that forms the cylindrical housing 50 a protrusion forms (a metal in the outer circumferential edge section) by absorbing pressure generated by upsetting in the direction of the X-axis. As a result, a protrusion is likely to form. 60b on the ring-shaped surface located at the distal end 52a on the side of the outer surface of the circumferential wall located at the distal end 52 trained.

[0067] As in (a) in Fig. 8 is shown, however, when the upsetting is carried out while the second annular, inclined surface 25 on the ring-shaped surface located at the distal end 52a the ring-shaped surface located at the distal end 52a on the side of the outer circumferential wall of the circumferential wall 52 located at the distal end, prevented from extending axially, but the annular surface located at the distal end 52a on the side of the inner circumferential wall surface of the circumferential wall located at the distal end 52 extends in such a way that it has a lead 60a trains.

[0068] If the rolling crushing tool 10 the present invention (or the one in (b) in Fig. 3 shown rolling upsetting tools 10A ) is used, is due to the activity of the second ring-shaped, inclined surface 25 prevented the lead from increasing 60b on the ring-shaped surface located at the distal end 52a on the side of the outer circumferential wall surface (the outer circumferential edge) of the circumferential wall located at the distal end 52 is trained, and the advantage 60a is located on the ring-shaped surface at the distal end 52a on the side of the inner circumferential wall surface of the circumferential wall located at the distal end 52 trained.

[0069] At this point, the ratio (t / r) of the thickness (the thickness of the circumferential wall located at the distal end) is 52 ) (t) of the opening 50a of the cylindrical housing and the radius (r) of the incircle for the curved surface of the second annular, inclined surface 25 of the rolling and shrinking tool 20 in a range of 2 to 9, as it is unlikely that the lead will be 60b is trained, and the advantage 60a easily trained. <Verfahren zum Verschließen mithilfe des Walzstauchwerkzeugs - 2>

[0070] A method for closing an opening of a cylindrical housing using the in Fig. 1 and (a) in Fig. 3 shown roll forming tool 10 and a detonator are referred to Fig. 9 described.

[0071] A cylindrical housing 112 It has a circular cross-section in the width direction and includes a ring-shaped, stepped surface. 117 , radially on an inner side of a circumferential wall 113 on the side of an opening 112a is formed, and has a circumferential wall located at a distal end. 113a from the ring-shaped, stepped surface 117 to the opening 112a .

[0072] The ring-shaped, stepped surface 117 is caused by a difference in thickness between the circumferential wall 113 and the circumferential wall located at the distal end 113a achieved, and a thickness of the circumferential wall located at the distal end 113a is less than the thickness of the perimeter wall 113 , where the circumferential wall located at the distal end 113a is not provided.

[0073] In the case of the ring-shaped, stepped surface 117 It could be a ring-shaped, convex section located on the inner surface of the circumferential wall. 113 on the side of the opening 112a of the cylindrical housing 112 is formed. In this case, a section from the ring-shaped, convex section to the opening corresponds to this. 112a the circumferential wall located at the distal end 113a , and a thickness of the circumferential wall located at the distal end 113a corresponds to the thickness of the perimeter wall 113 agree where the circumferential wall located at the distal end 113a is not provided.

[0074] The ratio (t / r) between the thickness (the thickness of the circumferential wall located at the distal end) 113a ) (t) of the opening 112b of the cylindrical housing and the radius (r) of the incircle for the curved surface of the second annular, inclined surface 25 of the compression section 20 The ratio is 2 to 9.

[0075] The cylindrical housing 112 is used in a gas generator, and the same housing can be used as in the known gas generators of (I) and (II) herein above.

[0076] As in Fig. The number 9 shown includes a detonator. 100 a detonator main body which contains a firing section 111 and an electrically conductive pen 118 has which is axially opposite the ignition section 111 extends, and a firing collar that surrounds part of the main detonator body. The axis of the detonator 100 and the axis of the cylindrical housing 112 agree.

[0077] The detonator collar has a ring-shaped plate section. 114 , which projects radially outwards and has a maximum outer diameter, and circumferential walls 115a until 115c on, which the ring-shaped plate section 114 not included.

[0078] The perimeter walls consist of the ring-shaped plate section. 114 in between around a first perimeter wall 115a on the side of the electrically conductive pin 118 and to construct a second perimeter wall 115b and a third perimeter wall 115c on the side of the ignition section 111 The first perimeter wall 115a , the second perimeter wall 115b and the third perimeter wall 115c They have different outer diameters, but they can also have the same outer diameter.

[0079] A space (a connector insertion space) for enclosing the electrically conductive pin. 118 is inside the first perimeter wall 115a formed, and a concave section adapted to fit a hook section of the connector is formed on the inner wall surface, forming the connector insertion space.

[0080] The ring-shaped plate section 114 is preferably made of a metal (such as iron or stainless steel), and the perimeter walls 115a until 115c are preferably made from a synthetic resin.

[0081] The ring-shaped plate section 114 has a first ring-shaped surface 114a , which belong to the ignition section 111 facing, a second ring-shaped surface 114b , which are electrically conductive 118 is facing, and has a ring-shaped circumferential surface 114c between the first ring-shaped surface 114a and the second ring-shaped area 114b on.

[0082] Furthermore, the ring-shaped plate section 114 a corner section, which is a first ring-shaped circumferential edge 116a at a boundary between the first ring-shaped surface 114a and the ring-shaped circumferential surface 114c it is, and a corner section, which is a second ring-shaped circumferential edge 116b at a boundary between the second ring-shaped area 114b and the ring-shaped circumferential surface 114c it.

[0083] When closing the opening 112a of the cylindrical housing 112 with the detonator 100 Is it possible to perform the first and second steps in the same way as if the closing element 70 is used.

[0084] First, in the same way as in Fig. 4 (the first step) shown, the detonator 100 from the opening 112a of the cylindrical housing to be closed 112 inserted until the first ring-shaped surface 114a of the ring-shaped plate section 114 on the ring-shaped, stepped surface 117 is pending.

[0085] At this point, the ring-shaped circumferential surface 114c of the ring-shaped plate section 114 slightly on the circumferential wall located at the distal end 113a or it lies radially opposite with a small gap in between.

[0086] After that, the opening will 112b of the cylindrical housing 112 with the detonator 100 sealed, as in Fig. 9 shown by the in Fig. 5 to (a) in Fig. The second step shown in section 8 is carried out.

[0087] Having described the invention in this way, it is evident that it can be varied in many different ways. Such variations are not to be considered as deviations from the essential content and scope of the invention, and all such modifications, as would be obvious to a person skilled in the art, are to be included within the scope of the following claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2011157025 [0002, 0007, 0008] JP 2007223485

[0008] JP 2008241186

[0008] JP 2011225069 [0021, 0057] JP 2011218942 [0021, 0057] JP 200730656 [0021, 0057] JP 201589760

[0025] JP 2014156207

[0025] JP 2006306218

[0025] JP 20159666

[0025] JP 2014144736

[0025] JP 201494614

[0025] < / walzstauchwerkzeug>

Claims

[1] Roll-forcing tool used to upset an opening of a cylindrical element by a roll-forcing process, the rolling upsetting tool has: a bearing shaft connected to a drive body; a plurality of rotating shafts extending in directions orthogonal to the bearing shaft; and essentially disc-shaped compression sections, each attached to one of the rotating shafts, wherein each of the essentially disc-shaped compression sections has a first surface which performs a compression and a second surface on the side opposite in the thickness direction, where the first surface has a ring-shaped first compression section, which has a minimum thickness and a maximum outer diameter, a third disc compression section, which has a maximum thickness and a minimum outer diameter, and a ring-shaped second compression section having a thickness between the minimum thickness and the maximum thickness and an outer diameter between the outer maximum diameter and the outer minimum diameter, a first annular, inclined surface provided at a boundary between the annular first compression section and the annular second compression section, a second annular, inclined surface, which is a curved surface provided at a boundary between the annular second compression section and the third disc compression section, and wherein the second annular, inclined surface is brought into contact with an outer circumferential edge of an annular surface located at a distal end of the opening of the cylindrical element when the opening is compressed by rolling. [2] Roll upsetting tool according to claim 1, wherein the ratio (t / r) of a radius (r) of an incircle for the second annular inclined surface, which is the curved surface, and a thickness (t) of the opening of the cylindrical element, which is a target of the roll upsetting, is 2 to 9. [3] Rolling upsetting tool according to claim 1 or 2, wherein the number of rotating shafts is 2 or 3 and the number of substantially disc-shaped upsetting sections is 2 or 3. [4] Method for closing an opening of a cylindrical housing of a gas generator with a closing element in the form of a flat plate using the roll forming tool according to claim 1, wherein the cylindrical housing has a stepped surface formed radially on an inner side of a circumferential wall on the side of one of the openings, and a circumferential wall located at a distal end extending from the stepped surface to the opening, wherein the closing element in the form of a flat plate is a disc comprising a first surface, a second surface on the side opposite the first surface in the thickness direction and a circumferential surface between the first surface and the second surface, and having such a shape and size that it can be inserted from the opening of the cylindrical housing and brought into contact with the stepped surface, and wherein the method for closing the opening of the cylindrical housing with the closing element in the form of a flat plate comprises: Inserting the locking element as a first step from the opening of the cylindrical housing to be closed, until the first surface rests against the stepped surface; and Upsetting as a second step using the roll-upsetting tool by rotating the bearing shaft, while the annular first upsetting section, the first annular inclined surface and the annular second upsetting section continuously in this sequence bear against an outer surface of the circumferential wall of the cylindrical housing located at the distal end and while the second annular inclined surface bears against an outer circumferential edge of an annular surface of the circumferential wall located at the distal end. [5] Method for closing an opening of a cylindrical housing of a gas generator with an igniter in the form of a flat plate using the rolling upsetting tool according to claim 1, wherein the cylindrical housing has a stepped surface formed radially on an inner side of a circumferential wall on the side of one of the openings, and a circumferential wall located at a distal end extending from the stepped surface to the opening, where the detonator has a detonator body comprising a firing section and an electrically conductive pin extending axially opposite the firing section, and a detonator collar surrounding part of the main body of the detonator, wherein the detonator collar has an annular plate section projecting radially outwards and having an outer maximum diameter, and a circumferential wall from which the annular plate section is excluded, wherein the annular plate section has such a shape and size that it can be inserted from the opening of the cylindrical housing and brought into contact with the stepped surface, and the method for closing the opening of the cylindrical housing with the detonator includes: Inserting the detonator as a first step from the opening of the cylindrical housing to be sealed, until the annular plate section of the detonator collar rests against the stepped surface; and Upsetting as a second step using the roll-upsetting tool by rotating the bearing shaft, while the annular first upsetting section, the first annular inclined surface and the annular second upsetting section continuously in this sequence bear against an outer surface of the circumferential wall of the cylindrical housing located at the distal end and while the second annular inclined surface bears against an outer circumferential edge of an annular surface of the circumferential wall located at the distal end.