JPH0229433B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a door sash for a vehicle that has a substantially U-shaped side surface.

Conventionally, this type of door sash has been manufactured by forming a sash material into an outer part 1, an inner part 2, a glass receiving groove part 3, and a weather strip holding part 4 in advance as shown in FIG. After cutting out each side b separately, bending the side part so that it has a frontal shape as shown in Fig. 1b, and bending the upper part into a side arch shape as shown in Fig. 1c, It is manufactured by cutting the joint ends diagonally at an angle of 1/2Θ of the predetermined bending angle Θ, butting them together, and fixing them by welding using a welding method such as flash-bond, TEG, MIG, or arc welding.

However, when this manufacturing process is used, both the upper part a and the side part b are bent into the final shape and then welded, so each cross-sectional shape is deformed as it is bent in the axial direction. It is difficult to align the butt edges cut diagonally, and moreover, it is not possible to match them accurately, resulting in poor welding.Furthermore, the local heat generated by welding causes the bending shape in the axial direction to deteriorate, especially on the upper side. When discrepancies occur, we are forced to correct them after the fact.

In particular, automobile door sashes have glass receiving grooves as mentioned above, and in order for the window glass to slide smoothly into the grooves, the door sashes must be accurately maintained in the predetermined dimensions and shape. If the welding does not occur properly and the welding remains unruly, the sliding resistance of the window glass will become extremely large due to twisting or the like, or the window glass will no longer function properly. Furthermore, if a bending process is applied to force this, excessive and undesirable local stress or strain will be generated in the welded part, which may cause cracks or lack of strength in the welded part.

The present invention provides a method for manufacturing a door sash for a vehicle that is creatively devised to eliminate such drawbacks.
With the goal.

That is, in the method for manufacturing a door sash according to the present invention, a V-shaped notch is formed with a part of the edge left at the boundary without cutting the sash material, which has been bent into a predetermined cross-sectional shape, into the upper part and the side part. After holding at least the upper part side in a straight line as the sash material and welding, the upper part is bent into a predetermined bending shape along the axial direction. has been done.

This will be explained below based on the second to fourth illustrated embodiments.

In the illustrated embodiment, an upper portion a and a side portion b form a door sash for a vehicle that has a substantially curved side profile.

The sash material used is a long, straight metal material of a certain length that has been bent into a predetermined cross-sectional shape and has a continuous glass receiving groove that guides the periphery of the window glass. There is. The sash material is bent by forming a V-shaped notch c at the boundary between the upper part a and the side part b using a press or rotating source, and butting the notch edges C ₁ and C ₂ without separating them into the upper part a and the side part b. Bend it so that it has a corner d that is approximately the same as the angle Θ. Prior to bending, the sash material can be curved into a frontal arc shape as shown in Figure 1 b on the side side b, but at least the top side a must be left straight as the sash material. . In this state, when bending the sash material from the edge e that remains at the location where the notch C is provided, a slightly thick bulge on the edge e that is partially left between the abutted notch edges C ₁ and C ₂ will be removed. However, there is no gap at all, and the corner d can be bent to almost coincide with the desired bending angle Θ.

After this bending, the sash material is held on the cradle of the welding machine with a chuck, and the bending angle Θ
is set to At this time, there is almost no gap between the abutted notch edges C ₁ and C ₂ of the corner d,
They can be held in abutment with the V-shaped notch. For the corner d, a teg that can send out a needle line at a constant speed and smooth it at a constant speed,
Welding is performed using a welding method such as MIG or arc so that the abutted notch edges C ₁ and C ₂ of the notch c are welded and fixed. During welding, since the upper side a is held straight, the notch edges C ₁ and C ₂ can be accurately butted and welded, and after this welding, the upper side a is held straight as shown in the third figure. remains at least straight, with the sides taking on the shape of a metal scale.

Upper side a remains straight after welding
In this case, the side surface is bent and formed into an appropriate shape such as a substantially arcuate shape. The bending is supported from the inside by a receiving mold (not shown) having a curved surface according to the desired bending shape on the inside of the upper side and the side side as shown in the fourth figure, and the pressing mold W This can be done by applying pressing force in _{step 1} . The pressing mold W ₁ applies a pressing force while sliding along the axis from the outside of the center of the bending radius of the receiving mold to the upper side. For side b, press die W ₁
All you have to do is hold it with the push mold W ₂ that is in sync with the
Further, the side b can also be bent using the pressing die W ₂ so that the side b has a circular arc shape.

In this way, the corner d has a V-shaped notch c that allows the notch edges C ₁ and C ₂ to butt against each other without separating the sash material, making positioning easy. The notch edge C ₁ that was left and butted together,
Since the cross-sectional shape of the upper side a is not deformed by joining _C2 , each joining edge with the side b can be accurately butted. In addition, after joining the ends of the upper side a and side b, the upper side a
Since the side that needs to be formed into a side surface shape such as an arcuate shape is bent, the side to be processed can be processed into the desired bent shape.

Although the above-mentioned embodiment has been explained based on the front side door sash having a substantially U-shape, it can also be applied to a back side door sash having a substantially U-shape. Furthermore, by polishing the welded surface with a grinder or the like, the surface can be finished into a beautiful smooth surface.

As described above, according to the method for manufacturing a door sash according to the present invention, welding defects such as dropout of the weld do not occur when joining the upper part and the side part, and there is no variation in the bending shape of each frame part. This allows accurate joining and shape retention.

[Brief explanation of drawings]

FIGS. 1A, 1B, and 1C are explanatory diagrams showing the conventional door sash manufacturing process, and FIGS. 2A, 2B, and 3 and 4 are explanatory diagrams showing the door sash manufacturing process according to the present invention. a: top part, b: side part, c: notch, C ₁ , C ₂ : notch edge, d: corner, e: partially remaining edge.

Claims (1)

[Claims] 1 Using a long straight sash material of a certain length, which has a continuous glass receiving groove that guides the periphery of the window glass and is pre-formed into a predetermined cross-sectional shape, it is inserted from the top part and the side part to the side part. ,
In order to form a vehicle door sash with a predetermined shape such as a U-shape, V-shaped notches are cut at the bending positions of the top and side parts while holding the sash material in a straight line. The upper part and the side part are bent into a side shape with a predetermined bending angle by bending the remaining edges and butting the cut edges, and then bending the upper part and the side part into a side shape with a predetermined bending angle, and then bending the upper part and the side part into a side shape with a predetermined bending angle, and then bending the upper part and the side part into an appropriate shape such as a side bow shape at least along the axial direction. While holding the upper part side that needs to be bent and formed into a straight line as the sash material, weld and join the butted notch edges first, and then curve and form the straight upper part into the desired shape. A method for manufacturing a door sash for a vehicle, characterized in that: