JP2510902Y2 - Round material step groove forming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a round material step groove forming apparatus for forming a step groove on the outer peripheral surface of a round material made of a vip material.

(Prior Art) Generally, the upper end of the seat back of an automobile seat has a
As shown in FIG. 11, a headrest 60 including a cushion body 61 and a substantially U-shaped headrest pole 62 that supports the cushion body 61.
It has. The headrest 60 is attached to the seatback side by inserting the two leg portions 62a, 62a into the receiving holes formed on the seatback side so that the legrests 62a and 62a can be freely inserted and removed. ,
On one side of the outer peripheral surface of the 62a, there are four grooves 64 to 67 that are appropriately spaced in the axial direction in order to position and hold the headrest 60 in the vertical direction (the direction of inserting and removing the headrest pole 62). A stepped groove 63 is formed. Conventionally, the headrest pole 62 is composed of a solid round bar, and the stepped groove is formed by cutting the round bar.
It was customary to cut and form 63 into each groove 64 to 67.

(Problems to be solved by the invention) However, in the case where the stepped groove 63 is formed by cutting as in the conventional case, a large number of manufacturing steps are required, resulting in deterioration of workability and increase in cost. was there. Further, such a problem also applies when the headrest pole 62 is made of a pipe material.

Therefore, according to the present invention, a stepped groove is formed at one time on the surface of a round material made of a pipe material to improve workability and cost reduction in forming operation of the stepped groove and to obtain high forming accuracy. The present invention provides a round material stepped groove forming device as described above.

(Means for Solving the Problem) As a means for solving such a problem, the present invention provides a round material for forming a plurality of grooves at predetermined intervals in an axial direction on an outer peripheral surface of a round material made of a pipe material. The stepped groove forming device has a first round material receiving surface formed of a circumferential surface having a semicircular cross section that can be closely attached to the outer circumferential surface of the round material, and extends in the circumferential direction on the first round material receiving surface. A holder formed with a plurality of molding blade insertion holes that open and close at predetermined intervals in the axial direction,
The plurality of forming blades are arranged on the back side of the first round material receiving surface with respect to the holder and the plurality of forming blades can be projected to the first round material receiving surface side through the respective forming blade insertion holes of the holder. A groove tool provided at an interval corresponding to the forming interval of the molding blade insertion hole, and a tip end portion of the peripheral surface having a semicircular cross-section capable of being in close contact with the outer peripheral surface of the round material, and the first holder of the holder. It has a second round material receiving surface arranged opposite to the round material receiving surface and is configured so as to be able to be brought into contact with and separated from the holder, and at the time of an approaching operation to the holder, the first round material receiving surface and the second round material receiving surface. While holding the round material by closely contacting the round material receiving surface with the outer peripheral surface of the round material, respectively, while holding the round material, the holder and the groove die are relatively moved in the projecting direction of the plurality of forming blades. The molding blades are From Katachiha insertion hole is characterized in that a pressurizing means for loading the pressure in the groove-type member as to protrude on the first round material receiving surface.

(Operation) According to the present invention, by adopting such a configuration, when the pressing means moves closer to the holder side, the outer peripheral surface of the round material is the second round material receiving surface on the pressing means side and the first round material on the holder side. While being held in close contact with the receiving surface, respectively, a pressing force is applied to the groove tool in this round material holding state, whereby the holder and the groove tool have a plurality of molding blades provided on the groove tool. By relatively moving in the projecting direction, the respective molding blades project from the respective molding blade insertion holes of the holder onto the first round material receiving surface. By the projecting operation of each of the forming blades onto the first round material receiving surface, the portion of the outer peripheral surface of the round material that is held in close contact with the first round material receiving surface corresponds to each of the forming blades. Each of the molding blades is pressed and deformed into a groove shape, and a stepped groove composed of a plurality of grooves arranged in the axial direction at predetermined intervals is formed on the round material. That is, the stepped groove formed of a plurality of grooves arranged at a predetermined interval in the axial direction is formed on the outer peripheral surface of the round material by one processing operation.

In this case, a plurality of molding blade insertion holes are formed in the first round material receiving surface of the holder that holds the outer peripheral surface of the round material in a close contact state, and the molding blades of the groove tool are passed through the respective molding blade insertion holes. Since the outer peripheral surface of the round material is pressed and deformed by projecting on the first round material receiving surface, (a) the portion of the outer peripheral surface of the round material other than the portion corresponding to the forming blade insertion hole is In the state of being constrained by the first round material receiving surface that is in close contact with the first round material receiving surface, and each of the molding blades exerts a pressing deformation action on a portion of the outer peripheral surface of the round material corresponding to the forming blade insertion hole, there is a margin for pressing deformation. Forming defects due to bulging or sagging of the meat in the vicinity of the forming part are reliably prevented, and a stepped groove with good shape accuracy corresponding to the shape of each forming blade is formed. To the corresponding forming blade insertion holes Therefore, since the movement of the forming blade in the direction orthogonal to the protruding direction is restricted, the arrangement interval of the forming blades, that is,
The gap between the plurality of grooves forming the stepped groove is always maintained properly, and a stepped groove with good dimensional accuracy can be obtained. (C) The outer peripheral surface of the round material is the first round material receiving surface on the holder side and the pressing means. When held in close contact with the second round material receiving surface on the side, since a plurality of molding blade insertion holes formed on the first round material receiving surface are opened on the outer peripheral surface of the round material,
Even when a force that relatively displaces the round material in the axial direction and the circumferential direction is applied to the holder and the pressing means at the time of machining the grooves by the forming blades, the outer peripheral surface of the round material has the forming blade insertion holes. This is surely prevented by being bitten into, and it becomes possible to form the stepped groove without causing a positional deviation with respect to a predetermined position on the outer peripheral surface of the round material, and the like.

(Effect of the Invention) Therefore, according to the round material stepped groove forming apparatus of the present invention, the following effects can be obtained.

Even though it is a round material made of a bipe material that is difficult to form a stepped groove by cutting, a stepped groove consisting of a plurality of grooves lined up at a predetermined interval in the axial direction is formed on the outer peripheral surface by press molding. Moreover, since it can be formed in a single processing step, workability in forming a stepped groove is improved compared to, for example, the case where a stepped groove is formed by cutting on the outer peripheral surface of a solid round bar as in the past. Further cost reduction can be achieved.

By providing a plurality of molding blade insertion holes on the first round member receiving surface of the holder, there is no molding defect, the shape accuracy is good, and the intervals of the grooves are always properly maintained. Since the groove can be accurately formed at a predetermined position on the outer peripheral surface of the round material, the reliability in work and accuracy in the step groove forming process is improved, and by extension, the product having the step groove is formed. It is expected that the product value of will be improved.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to FIGS.

1 and 2, the parallel groove 56 and the three inclined grooves 57 are formed on the outer peripheral surface of the leg portions 51 and 52 of the headrest pole 50 formed by bending the pipe material into a substantially U-shape. A round material step groove forming device Z for forming a step groove 55 consisting of 57 and 57 (see FIGS. 8 to 10) is shown.

The above-mentioned round material stepped groove forming apparatus Z is a later-described holder 1 and groove die 2 which are fitted to each other, and a pressurizing means 3 which is described later and applies a predetermined pressing force between the holder 1 and the groove die 2.
And have.

Holder 1 As shown in FIGS. 1 to 4, the holder 1 is integrally configured by a block body having a substantially rectangular outer shape. Further, on one end surface 1a side of the holder 1, a joint groove 11 having a substantially rectangular cross-sectional shape extending with the central portion of the end surface in the vertical direction is provided from the upper surface 1c to the lower surface of the holder 1.
It is formed over 1d. Further, in the center of the groove bottom surface 11b of the joint groove 11, a round material receiving surface 12 (corresponding to the "first round material receiving surface" in the scope of claim for utility model registration) is formed of a peripheral surface having a semicircular cross section. Is formed over the upper surface 1c and the lower surface 1d of the holder 1.

On the other end surface 1b side of the holder 1 (that is, on the back side of the round material receiving surface 12), the round material receiving surface 12 from the end surface 1b.
A mold insertion hole 13 having a rectangular cross section that is recessed toward the side is formed. As shown in FIG. 4, the position of the bottom surface 13a of the mold insertion hole 13 is set so as to overlap the top of the round material receiving surface 12 by a dimension S ₁ . The size S ₁ is slightly larger than the depth of the grooves 56, 57 to be formed.

Furthermore, at the position near the bottom surface 13a in the mold insertion hole 13,
Three intermediate walls 14 whose upper surface 14a is a flat surface and whose lower surface 14b is a substantially bent curved surface are provided in parallel in a direction orthogonal to the axial direction of the round material receiving surface 12. Then, of the three intermediate walls 14, 14, 14 arranged in the vertical direction, the upper surface 14a of the intermediate wall 14 located at the uppermost portion and the upper surface 13a of the mold insertion hole 13 are placed.
A first molding blade insertion hole 15 is formed between the first molding blade insertion hole 15 and the first molding blade insertion hole 15 with a relatively small vertical interval.
The central portion in the width direction at one end of the above is opened on the above-mentioned round material receiving surface 12. Further, between the respective intermediate walls 14, 14, 14 and between the lowermost intermediate wall 14 and the lower surface 13b of the mold insertion hole 13, the second to fourth moldings each having a relatively large vertical gap are formed. Blade insertion hole 16,1
7, 18 are formed, and the width direction central portions of the one ends of the respective molding blade insertion holes 16, 17, 18 are opened on the round material receiving surface 12.

Groove tool 2 The groove tool 2 has a cross-sectional shape that can be fitted into the mold fitting hole 13 of the holder 1 as shown in FIGS. 1, 2, 5 and 6. It is integrally formed of a block body including a blade portion 21 and a support portion 22 that is continuous with the rear end portion of the forming blade portion 21. The groove-shaped tool 2 is fixedly arranged on the base 14 by fixing the support portion 22 to the support base 23.

At the tip portion 21a of the molding blade portion 21, four molding blades that can be fitted into the molding blade insertion holes 15 to 18 of the holder 1, that is, a thin plate-shaped first molding blade 25, and the tip side Thick plate-shaped second to fourth shaping blades 26 to 28 each having an inclined surface are provided so as to project forward in the axial direction of the shaping blade portion 21.

6 to 8 in a state in which the forming blade portion 21 of the groove die 2 is fitted into the die fitting hole 13 of the holder 1.
As shown in the figure, the molding blades 25 to 28 of the molding blade portion 21 are fitted into the molding blade insertion holes 15 to 18 of the corresponding holder 1, respectively. Then, the holder 1 is pushed most into the forming blade portion 21 of the groove tool 2, that is, as shown in FIG. 8, the inclined surfaces of the forming blades 26, 27, 28 of the forming blade portion 21. In a state in which the inclined surfaces of the molding blade insertion holes 16, 17, 18 of the holder 1 are in contact with each other and further pushing is restricted, the tip surfaces 25a to 28a of the molding blades 25 to 28 correspond to each other. The molding blade insertion holes 15 to 18 are made to project from the opening ends 15a to 18a to the round material receiving surface 12 side by a dimension S ₂ . This dimension
S ₂ corresponds to the depth dimension of each groove 56, 57 of the stepped groove 55 to be formed, and has a smaller dimension than the above method S ₁ .

A cushion member 29 is attached between the holder 1 and the groove tool 2 as shown in FIGS. 1 and 2.

Pressurizing Means 3 The pressing means 3 is, as shown in FIG. 1 and FIG.
It has a pressing member 32 which is attached to the base 31 so as to be movable in the vertical direction and is pressed downward, and a moving member 33 which is attached so as to be able to move forward and backward in the horizontal direction. The pressing member 32 and the moving member 33 are slidably brought into contact with each other via the inclined surfaces 32a and 33a, respectively.
The downward pressure applied to the 32 is converted and transmitted to the moving member 33 as a displacement force in the protruding direction. In addition, the tip end surface 36 of the moving member 33 is
A round material receiving surface 35 (corresponding to the “second round material receiving surface” in the scope of claims for utility model registration) having a central portion of a round material receiving surface 12 corresponding to the round material receiving surface 12 of the holder 1. 4) is integrally provided.

The protruding portion 34 is fitted in the joint groove 11 of the holder 1 and is guided in the advancing / retracting direction by both side surfaces 11b, 11b of the vertical groove 11. Further, when the projecting portion 34 advances and its tip surfaces 36 (end surface portions located on both sides of the round material receiving surface 35) abut the bottom surface 11a of the joint groove 11 of the holder 1, the round material of the holder 1 A cylindrical space is formed between the receiving surface 12 and the round material receiving surface 35 of the protrusion 34 so that the leg portion 51 or the leg portion 52 of the headrest pole 50 can be closely held.

Description of Operation Next, the operation of each part of the apparatus in the case of forming the stepped groove 55 on the outer peripheral surface of the leg portion 51 of the headrest pole 50 by using the round material stepped groove forming apparatus Z configured as described above Follow the procedure.

(A) Mounting of Holder Headrest Pole 50 on Device First, with the holder 1 assembled to the molding blade portion 21 of the groove tool 2, the pressing means 3 is operated to retract the protruding portion 34, A large leg insertion space 37 is formed between the round material receiving surface 35 of the portion 34 and the round material receiving surface 12 of the holder 1. The backward movement of the protruding portion 34 is performed by releasing a pressing force applied to the pressing member 32 so that a return mechanism (not shown) including a return spring provided between the base 31 and the moving member 33 is shown. ) Automatically.

Next, as shown in FIGS. 1 and 2, the headrest pole 50 has one leg portion 51 inserted through the leg insertion space 37, and the other leg portion 52 is provided on the base 24. Placed on the leg support base 41. Then, the one leg portion 51 is pulled toward the pressurizing means 3 side, and this is protruded portion.
The round member receiving surface 35 of 34 is brought into contact with the end portion of the leg portion 51.
The headrest pole 50 is accurately positioned at these three positions by contacting the end portion positioning stopper 42 with 51a and the connecting portion 53 with the connecting portion positioning stopper 43, respectively. This completes the installation of the headrest pole 50. The positional relationship among the headrest pole 50, the protrusion 34, the holder 1 and the groove tool 2 in this state is as shown in FIG. At this time, the holder 1 is projected forward of the groove tool 2 by the elastic force of the cushion material 29, and the molding blades 25 to 28 of the groove tool 2 are inserted into the molding blade insertion holes 15 of the holder 1. It is located on the rear side of the open ends 15a to 18a.

(B) Forming Work of Grooved Tool Stepped Groove 55 Next, the forming work of the stepped groove 55 will be described with reference to FIGS. 6 to 8.

First, from the initial position shown in FIG. 6, the pressurizing means 3 is actuated to move the projecting portion 34 forward, and as shown in FIG. 7, the tip end surface 36 thereof contacts the bottom surface 11a of the joint groove 11 of the holder 1. Contact. In this state, the outer peripheral surface of the leg portion 51 is brought into close contact with both the round material receiving surface 35 on the protruding portion 34 side and the round material receiving surface 12 on the holder 1 side, and is sandwiched and held by these.

From this state, if the protrusion 34 is pushed further forward,
As shown in FIG. 8, the holder 1 has the above cushion material 29.
Move forward while pressing and deforming each of the forming blade insertion holes 15 ~
18 front end face 25a~28a of each of the forming blades 25 to 28 of the channel member 2 from the open end 15a~18a only dimension S ₂ each round material receiving surface 12 protrudes on, the round material by respective molding blades 25 to 28 A concave deforming action is applied to the outer peripheral surface of the leg portion 51 that is in close contact with the receiving surface 12, and the parallel grooves 56 and the three inclined grooves 57, 57, 57 are formed on the outer peripheral surface by the respective molding blades 25 to 28. The stepped groove 55 is formed at the same time (see FIGS. 9 and 10). After the molding is completed, the protrusion 34 is retracted and the headrest pole 50 is removed from the device.
This completes the work of forming the stepped groove 55.

As described above, according to the round material stepped groove forming device Z of this embodiment, a stepped groove formed of a plurality of grooves arranged on the outer peripheral surface of the round material formed of the pipe material at appropriate intervals in the axial direction thereof. Can be simultaneously molded in one molding step, and the workability of the molding operation is further improved as compared with the case where each groove is molded by cutting, for example.

Further, according to the round material stepped groove forming apparatus Z of this embodiment, in addition to the above-described basic operation and effect, a plurality of forming blade insertion holes 15 to 18 are formed on the round material receiving surface 12 of the holder 1. By doing so, the peculiar operational effects as described below are exhibited. That is, in the round material stepped groove forming device Z of this embodiment, the leg portion of the headrest pole 50 is
A plurality of forming blade insertion holes 15 to 18 are formed on the round material receiving surface 12 of the holder 1 for holding the outer peripheral surface of 51 in a close contact state, and each forming of the groove tool 2 is performed through the forming blade insertion holes 15 to 18. Blade 25 ~ 28
Are projected on the round material receiving surface 12 to press and deform the outer peripheral surface of the leg portion 51. Therefore, firstly, the molding blade insertion holes 15 to 15 on the outer peripheral surface of the leg portion 51 to
The parts other than the part corresponding to 18 are in a state of being restrained by the round material receiving surface 12 on the holder 1 side which is in close contact therewith. Therefore, when a pressing deformation action is exerted on the outer peripheral surface of the leg portion 51 corresponding to the forming blade insertion holes 15 to 18 by the forming blades 25 to 28, the vicinity of the forming portion of the excess thickness due to the pressing deformation. The occurrence of molding defects such as swelling and sagging can be reliably prevented. As a result, each forming blade
Grooves 56,57,57,5 with good shape accuracy corresponding to shapes 25 to 28
7, that is, the stepped groove 55 is formed.

Secondly, since the molding blades 25 to 28 are restricted from moving in the direction orthogonal to the projecting direction of the molding blades 25 to 28 by the corresponding molding blade insertion holes 15 to 18, respectively. The arrangement interval of the molding blades 25 to 28, that is, the interval between the plurality of grooves 56, 57, 57, 57 forming the stepped groove 55 is always properly maintained, and the stepped groove 55 with good dimensional accuracy is provided. Is what you get.

Thirdly, the outer peripheral surface of the leg portion 51 is fixed to the round member receiving surface 12 on the holder 1 side.
And the round material receiving surface 35 on the pressurizing means 3 side are held in close contact with each other. In this case, a plurality of molding blade insertion holes 15 to 18 are opened on the round material receiving surface 12 and these molding blade insertion holes are inserted. Hole 15
Since ~ 18 is in close contact with the outer peripheral surface of the leg portion 51, the leg portion 51 is axially and circumferentially attached to the holder 1 and the pressurizing means 3 when the grooves are formed by the forming blades 25 to 28. Even if a force that causes relative displacement in the direction is applied, the leg portion 51
The outer peripheral surface of each of the molding blade insertion holes 15 to 18 is surely prevented by biting the outer peripheral surface of each of the molding blade insertion holes 15 to 18, and the stepped groove 55 is formed without causing a positional deviation with respect to a predetermined position of the outer peripheral surface of the leg portion 51. Is possible.

Therefore, as a synergistic effect of these, by providing a plurality of molding blade insertion holes 15-18 on the round material receiving surface 12 of the holder 1,
There are no molding defects, good shape accuracy, and multiple grooves 56, 57,
The stepped groove 55 with good dimensional accuracy, in which the interval between 57 and 57 is always maintained properly, can be accurately formed at a predetermined position on the outer peripheral surface of the leg portion 51, which is an advantage in working in the stepped groove forming process. And accuracy reliability is improved, and by extension, the stepped groove 55
It can be expected that the product value of the headrest pole 50 as a product formed with is improved.

Although the headrest pole 50 is made of a pipe material having a circular cross section in this embodiment, it may be made of a pipe material having an elliptical cross section in other embodiments. Further, in this embodiment, the case where the stepped groove 55 is formed in the headrest pole is shown, but the present invention is not limited to this, and any round material constituted by a pipe material may be used regardless of its application. Of course, it can be applied without any.

Further, according to the round material stepped groove forming apparatus Z of this embodiment, the number and shape of the forming blade insertion holes of the holder 1 and the forming blades of the groove die 2 or the intervals between the forming blades are changed. By preparing a plurality of types and selectively using them, stepped grooves having different numbers of steps or groove shapes can be formed by the same apparatus.

Further, even with respect to the leg portion 51 or 52 of the headrest pole 50 bent in a substantially U-shape as in this embodiment, the leg portion 51 held on the holder 1 side is rotated by an appropriate angle. By making it possible to hold the stepped groove, the stepped groove can be formed at any position in the circumferential direction of the outer peripheral surface of the stepped groove.

[Brief description of drawings]

FIG. 1 is a plan view of a round material stepped groove forming device according to an embodiment of the present invention, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. 3 is an enlarged sectional view of the holder shown in FIG. FIG. 4 is a perspective view of FIG.
IV-IV vertical sectional view, FIG. 5 is an enlarged sectional perspective view of the groove type tool shown in FIG. 1, FIG. 6 is an enlarged vertical sectional view of a VI portion of FIG. 1, and FIGS. FIG. 6 is a state change diagram of FIG. 6, FIG. 9 is a front view showing a molded state of the stepped groove, FIG. 10 is a vertical sectional view taken along the line XX of FIG. 9, and FIG. 11 is a headrest pole having the stepped groove formed. It is a perspective view of the headrest provided with. 1 is a holder, 2 is a groove tool, 3 is a pressing means, 11 is a vertical groove,
12 is a round material receiving surface (first round material receiving surface), 15 to 18 are forming blade insertion holes, 21 is a forming blade portion, 25 to 28 are forming blades, 32 is a pressing member, 33
Is a moving member, 34 is a protruding portion, 35 is a round material receiving surface (second round material receiving surface), 50 is a headrest pole, 51 and 52 are legs, 53 is a connecting portion, 55 is a stepped groove, and 56 is a parallel groove. , 57 are inclined grooves.

Claims (1)

(57) [Scope of utility model registration request] 1. A round material stepped groove forming apparatus for forming a plurality of grooves on an outer peripheral surface of a round material made of a pipe material at predetermined intervals in an axial direction thereof, the cross sectional half being capable of closely contacting with the outer peripheral surface of the round material. A first round material receiving surface having a circular peripheral surface is formed, and a plurality of forming blade insertion holes extending in the circumferential direction are formed on the first round material receiving surface at predetermined intervals in the axial direction. A holder and a rear side of the first round material receiving surface with respect to the holder, and a plurality of molding blades can be projected to the first round material receiving surface side through the respective molding blade insertion holes of the holder. As described above, the groove tool is provided at an interval corresponding to the forming interval of each of the forming blade insertion holes, and the tip end portion of the groove member has a semicircular peripheral surface that can be in close contact with the outer peripheral surface of the round material, and Having a second round material receiving surface that is arranged to face the first round material receiving surface Is configured so as to be able to be brought into contact with and separated from the holder, and at the time of an approaching operation to the holder, the first round material receiving surface and the second round material receiving surface are in close contact with the outer peripheral surface of the round material. To hold the round material and to relatively move the holder and the groove tool in the projecting direction of the plurality of molding blades to move the molding blades from the molding blade insertion holes to the first round material receiving surface. A round material stepped groove forming device, comprising: a pressurizing means for applying a pressure to the groove tool so as to project upward.