JP2018202457A - Pipe processing method and die member for pipe processing - Google Patents

Abstract

To provide a die processing method and a die member for pipe processing capable of mainly performing press processing having excellent accuracy by preventing a positional deviation in axial line directions of die and core upon press processing.SOLUTION: A pipe processing method for performing press processing onto an outer circumferential part of a part to which a die member 11 is inserted from the outer side of a pipe member 2 while inserting the die member 11 to an inner part of the pipe member 2 is provided. The die member 11 is halved into a die 22 of this side and a core 23 of the inner side along a press processing direction 21. Rugged parts 26, 27 alternately having mountain parts 26a, 27a and valley parts 26b, 27b which are engageable with each other along an axial line direction 24 of the pipe member 2 are respectively provided on a joint surface of the die 22 and the core 23. The press processing is performed in such a state that the mountain parts 26a, 27a of the rugged parts 26, 27 are abutted on each other. The drawing of the die member 11 from the pipe member 2 is performed in such a state that the mountain parts 26a, 27a and the valley parts 26b, 27b of the rugged parts 26, 27 are engaged with each other.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a pipe processing method and a pipe processing mold member.

  In vehicles such as automobiles, an instrument panel is installed in the front part of the passenger compartment. Inside the instrument panel, a metal body strength member is provided that extends in the vehicle width direction and connects the left and right body panels.

  A metal pipe member is used as the vehicle body strength member. This metal pipe member was processed by pressing the outer peripheral portion of the portion where the mold member was inserted from the outside of the pipe member while the mold member was inserted therein (for example, Patent Literature 1).

  However, in the case of a large pipe member such as a vehicle body strength member, the mold member becomes large and heavy, so that it becomes difficult to pull out the mold member from the pipe member after processing, and the mold member is pulled out from the pipe member. The equipment becomes large. Therefore, the mold member is divided into two parts, a die and a core metal, and an axis that acts on the inclined surface when the mold member is pulled out by making the mating surface of the die and the core metal an inclined surface (wedge surface). It has also been studied to make it easy to pull out the mold member by using the component force in the direction.

JP-A-4-327323

  However, when the mating surface of the die and the metal core is an inclined surface, the die and the metal core are easily displaced in the axial direction of the pipe member during pressing. As a result, high-precision processing cannot be performed.

  Therefore, the present invention mainly aims to solve the above-described problems.

In order to solve the above problems, the present invention provides:
In the pipe processing method of performing press processing on the outer peripheral portion of the portion where the mold member is inserted from the outside of the pipe member in a state where the mold member is inserted inside the pipe member,
Dividing the mold member into a front die and a back core along the pressing direction;
Provided on the mating surfaces of the die and the cored bar are concavo-convex portions alternately having crests and troughs that can mesh with each other along the axial direction of the pipe member,
While performing the press work in a state where the ridges of the uneven portion are in contact with each other,
The mold member is pulled out from the pipe member in a state where the crests and troughs of the uneven portion are engaged with each other.
Thereby, it becomes possible to prevent the positional deviation in the axial direction between the die and the cored bar at the time of press processing by bringing the crests a of the concavo-convex part into contact with each other.

  According to the present invention, with the above-described configuration, it is possible to prevent the positional deviation in the axial direction between the die and the core metal during the pressing process and perform a highly accurate pressing process.

It is a vehicle body strength member whole perspective view provided with the pipe member which applies the pipe processing method concerning this Embodiment. It is process drawing of a pipe processing method. It is process drawing of the pipe processing method following FIG. It is process drawing of the pipe processing method following FIG. It is process drawing of the pipe processing method following FIG. It is process drawing of the pipe processing method following FIG. It is process drawing of the pipe processing method following FIG. It is process drawing of the pipe processing method following FIG. It is process drawing of the pipe processing method following FIG. It is a side view at the time of the press of the metal mold | die member for pipe processing. FIG. 11 is an end view of FIG. 10. It is a side view at the time of extraction of the metallic mold member for pipe processing. FIG. 13 is an end view of FIG. 12. It is a partial expanded side view of the pressed pipe member.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 14 are for explaining this embodiment.

  <Configuration> The configuration of this embodiment will be described below.

  The directions in the figure are the vehicle longitudinal direction X, the vehicle width direction Y, and the vertical direction Z.

  In vehicles such as automobiles, an instrument panel is installed in the front part of the passenger compartment. As shown in FIG. 1, a metal vehicle body strength member 1 that extends in the vehicle width direction Y and connects the left and right vehicle body panels is provided inside the instrument panel. A metal pipe member 2 is used for the vehicle body strength member 1.

  Side brackets 3 for attachment to the side panels of the vehicle body are attached to the pipe member 2 at both ends. In addition, a stay 4 for supporting the vehicle body floor panel is attached to an intermediate portion of the pipe member 2. Further, a column bracket 5 for supporting the steering column is attached to a portion of the pipe member 2 on the driver seat side. A post bracket 6 for supporting the front wall of the passenger compartment is attached in the vicinity of the column bracket 5. Various other brackets are attached to the pipe member 2.

  Then, the pipe member 2 is also processed so that various parts can be directly attached to the pipe member 2 by omitting at least a part of these brackets.

  As shown in FIGS. 2 to 5, the metal pipe member 2 is processed by setting the pipe member 2 in a press device in a state where the mold member 11 is inserted into the pipe member 2. 2 is performed by pressing the outer peripheral portion of the portion into which the mold member 11 is inserted from the outside using the mold 12 of the press device. At this time, the mold member 11 basically has a shape substantially equal to the internal space of the pipe member 2 and also has a recess or the like corresponding to the shape to be processed. The outer peripheral part of the pipe member 2 can be an end part or a center part of the pipe member 2.

  In contrast to the basic configuration as described above, this embodiment has the following configuration.

(1) The pipe processing method will be described below.
The die member 11 is divided into two parts, a die 22 on the front side (upper side in the figure) and a core metal 23 on the back side (lower side in the figure) along the press working direction 21.
On the mating surface of the die 22 and the cored bar 23, there are provided uneven portions 26 and 27 having alternately peak portions 26a and 27a and valley portions 26b and 27b that can mesh with each other along the axial direction 24 of the pipe member 2. .
Then, as shown in FIGS. 2 to 5, press working is performed in a state where the crests 26 a and 27 a of the concave and convex portions 26 and 27 are in contact with each other (see FIGS. 10 and 11).
Further, as shown in FIGS. 6 to 9, the peak portions 26 a and 27 a and the valley portions 26 b and 27 b of the uneven portions 26 and 27 are engaged with each other (see FIGS. 12 and 13) from the pipe member 2. The mold member 11 is pulled out.

  Here, at the time of drawing, it is preferable to shift the positional relationship with the die 22 by pulling the cored bar 23.

  (2) As shown in FIG. 14, a burring hole 32 having a flange portion 31 extending inward of the pipe member 2 is formed in the pipe member 2 by pressing.

  Here, in the pressing process on the pipe member 2, the burring hole 32 is formed on the flat surface 33. It is preferable that the flat surface 33 and the burring hole 32 are simultaneously processed by a single press. Therefore, a concave portion for forming the flat surface 33 and the burring hole 32 is appropriately provided in the upper portion of the die 22 in the drawing.

  Thus, by providing the pipe member 2 with the flat surface 33 and providing the flat surface 33 with the burring hole 32, the flat surface 33 can be used as a seating surface and the components can be stably attached to the burring hole 32. . However, the flat surface 33 is not necessarily required. In the above description, the burring hole 32 has been described as an example. However, in the press working, a raw hole that does not have the flange portion 31 may be provided. Furthermore, both the burring hole 32 and the raw hole can be provided simultaneously.

  (3) The step amount 41 (FIGS. 10 and 12) between the crest portions 26a and 27a and the trough portions 26b and 27b of the concavo-convex portions 26 and 27 is greater than the protrusion amount 42 (FIG. 12) of the flange portion 31 of the burring hole 32. (Step difference amount 41> projection amount 42).

  Here, when the flat surface 33 is provided simultaneously with the burring hole 32, the depth of the flat surface 33 is also included in the protruding amount 42 of the flange portion 31 of the burring hole 32.

  (4) As shown in FIG. 10, from the end of the pipe member 2 between the die 22 and the core metal 23 inserted into the pipe member 2 with the crests 26 a and 27 a of the concave and convex portions 26 and 27 in contact with each other. Press work is performed in a state where the positioning pins 54 are inserted into the positioning holes 52 and 53 that are provided between the projecting protruding parts 51 (see FIG. 3) and communicate with the press working direction 21.

  Here, in the protruding portion 51 of the metal core 23, another positioning hole into which the positioning pin 54 can be inserted when the crest portions 26a, 27a and the trough portions 26b, 27b of the uneven portions 26, 27 are engaged with each other. 55 (see FIG. 12) may be provided.

  (5) Hereinafter, the pipe processing mold member 11 (pipe processing mold member) will be described.

When the pipe member 2 is subjected to press working, a pipe working die member 11 to be inserted into the pipe member 2 is provided.
The die member 11 for pipe processing is constituted by a front die 22 and a back core 23 which are divided into two along the press working direction 21.
The die 22 and the core metal 23 are provided with concave and convex portions 26 and 27 having alternately crest portions 26a and 27a and trough portions 26b and 27b that can mesh with each other along the axial direction 24 of the pipe member 2 on the mating surface. Like that.

  Here, the uneven portion 26 of the die 22 and the uneven portion 27 of the core metal 23 are the same. And the crest 26a and the trough 26b of the uneven | corrugated | grooved part 26 of die | dye 22 and the crest 27a and the trough 27b of the uneven | corrugated | grooved part 27 of the metal core 23 are equidistant, respectively. As a result, the peak portions 26a and 27a can be made larger to withstand a larger press load. Further, when the die member 11 for pipe processing is pulled out from the pipe member 2, it is possible to easily transmit the pulling force between the die 22 and the cored bar 23 in which the concave and convex portions 26 and 27 are engaged with each other. it can. In addition, it becomes easy to insert the positioning pin 54 between the die 22 and the cored bar 23 in a state where the concave and convex portions 26 and 27 are engaged with each other.

  The mountain portions 26a and 27a have top surface portions 26c and 27c perpendicular to the pressing direction 21, respectively. Thereby, the press work without a position shift in the axial direction 24 can be performed.

  The step portions between the mountain portions 26a, 27a and the valley portions 26b, 27b are inclined surfaces 26d, 27d. As a result, when the die 22 and the core metal 23 are shifted 24 in the axial direction and the concave and convex portions 26 and 27 are engaged with each other, the height gradually changes along the inclined surfaces 26d and 27d (or does not drop at a stretch). Can be.

  As shown in FIGS. 11 and 13, the mating surface of the die 22 and the core metal 23 is shifted upward or downward with respect to the position having a diameter perpendicular to the pressing direction 21. In this case, the metal core 23 is made larger than the die 22 by shifting upward.

  <Effect> According to this embodiment, the following effects can be obtained.

  (Effect 1) At the time of a press work, it is made into the state which contact | abutted the peak parts 26a and 27a of the uneven | corrugated | grooved part 26 and 27 each provided in the mating surface of the die | dye 22 and the core metal 23 which comprise the metal mold | die member 11. Thus, the clearance between the pipe member 2 and the mold member 11 inserted into the pipe member 2 can be minimized. Moreover, it can endure a press load by making the peak parts 26a and 27a of the uneven | corrugated | grooved parts 26 and 27 contact | abut at the time of press work. At this time, by causing the crests 26a and 27a of the concave and convex portions 26 and 27 to be in contact with each other, it is possible to prevent the positional deviation in the axial direction 24 between the die 22 and the cored bar 23 during press working. By these, accurate press working can be performed.

  Further, when the die member 11 is pulled out from the pipe member 2, the positions of the die 22 and the core metal 23 are shifted in the axial direction 24 so that the crest portions 26 a and 27 a and the trough portions 26 b and 27 b of the concave and convex portions 26 and 27. Since the two are engaged with each other, the clearance between the pipe member 2 and the mold member 11 can be increased, and the mold member 11 can be easily pulled out from the pipe member 2.

  On the other hand, for example, without providing the uneven portions 26 and 27 on the mating surface of the die 22 and the core metal 23, the mating surface is a flat surface along the axial direction 24 of the pipe member 2, and the flat surface is the entire surface. In the case of contact, it becomes difficult to pull out the mold member 11 from the pipe member 2.

  (Operation effect 2) The burring hole 32 was formed by press working. Thereby, the burring hole 32 with high accuracy can be made by using the die 22 and the cored bar 23 each having the uneven portions 26 and 27 on the mating surfaces. Since the burring hole 32 has the flange portion 31 and can secure a wide fastening surface with respect to the axial direction of the fastener, it is advantageous in mounting components.

  (Effect 3) The step amount 41 between the crests 26a, 27a and the trough portions 26b, 27b of the uneven portions 26, 27 is made larger than the protrusion amount 42 of the flange portion 31 of the burring hole 32. Accordingly, the positions of the die 22 and the cored bar 23 are shifted in the axial direction 24 so that the crests 26a, 27a and the troughs 26b, 27b of the concavo-convex parts 26, 27 are engaged with each other. Since the height of the press working direction 21 between the core 22 and the metal core 23 is smaller than the protrusion 42 of the flange 31, the mold member 11 can be moved without causing interference with the flange 31 of the burring hole 32. The pipe member 2 can be pulled out.

  (Effect 4) The protruding portion 51 from the end of the pipe member 2 in the die 22 and the core metal 23 inserted into the pipe member 2 is inserted into the positioning holes 52 and 53 in the axial direction 24 by inserting the positioning pins 54 into the positioning holes 52 and 53. Fixed. Thereby, the position shift of the axial direction 24 of the die | dye 22 and the metal core 23 can be prevented reliably at the time of press work. Therefore, it is possible to perform press processing with higher accuracy.

  (Effect 5) According to the die member 11 for pipe processing, the same operation effect as the above-described pipe processing method can be obtained.

2 Pipe member 11 Mold member 21 Press working direction 22 Die 23 Core 24 Axial direction 26 Concave portion 26a Mountain portion 26b Valley portion 27 Concavity portion 27a Mountain portion 27b Valley portion 31 Flange portion 32 Burring hole 41 Step amount 42 Projection amount 51 Protruding portion 52 Positioning hole 53 Positioning hole 54 Positioning pin

Claims (5)

In the pipe processing method of performing press processing on the outer peripheral portion of the portion where the mold member is inserted from the outside of the pipe member in a state where the mold member is inserted inside the pipe member,
Dividing the mold member into a front die and a back core along the pressing direction;
Provided on the mating surfaces of the die and the cored bar are concavo-convex portions alternately having crests and troughs that can mesh with each other along the axial direction of the pipe member,
While performing the press work in a state where the ridges of the uneven portion are in contact with each other,
A pipe processing method, wherein the mold member is pulled out from the pipe member in a state where the crests and troughs of the concavo-convex part are engaged with each other. The pipe processing method according to claim 1,
A burring hole having a flange portion extending inward of the pipe member is formed in the pipe member by the press working. The pipe processing method according to claim 2,
The pipe machining method according to claim 1, wherein a level difference between the peak portion and the valley portion of the uneven portion is larger than a protruding amount of the flange portion of the burring hole. A pipe processing method according to any one of claims 1 to 3,
In the press working direction, provided between the protruding portion protruding from the end portion of the pipe member, the die inserted into the pipe member in a state where the crests of the uneven portion are in contact with each other. A pipe processing method, wherein pressing is performed with a positioning pin inserted into a communicating positioning hole. When performing the press processing on the pipe member, in the mold member for pipe processing to be inserted into the pipe member,
While having a front die and a back core divided into two along the pressing direction,
The die for processing a pipe is characterized in that the die and the metal core are provided with concave and convex portions alternately having crests and troughs that can mesh with each other along the axial direction of the pipe member on the mating surface. Mold member.