JPH038887B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pair of synthetic resin shaped frames used in construction such as window frames, fittings, picture frames, etc. The present invention relates to a method for removing weld tension caused by welding two cut ends together at right angles, particularly at an inside corner having a vertical portion and a horizontal portion.

[Conventional technology]

When manufacturing synthetic resin frames for window frames, fittings, picture frames, etc., the ends of synthetic resin shapes are welded at right angles as follows.

First, the ends of the synthetic resin shaped material are cut at 45 degrees, the cut surfaces are butted against each other, and they are melted and welded by heating means.

When welded in this way, welding tension is generated at the welded portion, so it is necessary to remove this welding tension.

Problems to be Solved by the Invention Weld tension occurs at the protruding corners, inner corners, and upper and lower parts of the welded part, and the weld tension at the protruding corners and upper and lower parts depends on the outer surface shape and upper and lower surface shape of the synthetic resin shaped material. Since it is simple and there is a wide space above and below the welded part, it can be automatically removed using a tensioning machine.

However, when welding the inside corners, the space inside the welded part is narrow, and the inner shape of the synthetic resin shape is difficult to fit into the glass fitting groove, the airtight material fitting groove, or the support protrusion for attaching other shapes. Because the steps and protrusions that make up the section are complex and have vertical and horizontal sections, it is difficult to remove them using a manual or electric tensioning machine. Since it is removed manually using a rotary blade or hand grinder, the work efficiency is reduced.

[Means and actions for solving problems]

A conical rotary blade with an apex angle of approximately 76 degrees is made so that the rotation center line passing through the apex coincides with the longitudinal direction of the welded part and is inclined approximately 38 degrees with respect to the horizontal part of the inside corner. With the blade in contact with the welded part, rotate the rotary blade and move it parallel to the longitudinal direction of the welded part. It can be removed by moving the rotating blade in parallel.

Example Fig. 9 is a front view of the synthetic resin frame A before assembly, and Fig. 10 is a front view of the assembled state. As shown in Fig. 11, it is a hollow long piece surrounded by an upper surface 2, a lower surface 3, an outer surface 4, and an inner surface 5. Its end 1' is cut at 45 degrees, and the cut surfaces are brought together and heated. By melting them, they are welded to each other at right angles, and welding tensions 6 are formed around the welded parts, that is, at the upper part, the inner corner, the lower part, and the outer corner of the section 1, as shown in FIG. Occurs on the outside and inside of thick parts.

In particular, the inner surface 5 of the shape 1 has a first vertical wall 7, a first
horizontal wall 8, second vertical wall 9, second horizontal wall 10, third
The vertical wall 11 forms a staircase shape, and the first vertical wall 7 is formed with a projecting piece 12, and the second horizontal wall 10 is formed with an airtight material fitting groove 13, resulting in a complicated shape. The corner has a complex shape with a vertical part and a horizontal part continuous with the vertical part, and has a welding tension of 6.
are the first vertical part 5 ₁ , the first horizontal part 5 ₂ , and the second vertical part 5
_3. A weld tension 6 ₆ is formed in the second horizontal portion 5 ₄ and the third horizontal portion 5 ₅ in a step-like manner and narrows the groove width at the welded portion of the airtight material fitting groove 13 . Makes mating difficult.

FIG. 1 is an explanatory diagram of a method for removing the welding tension 6 between the upper part, the inside corner, and the lower part. The rotation center line 20' passing through 20a coincides with the longitudinal direction of the welded part, and the rotary blade 2 is inclined at an angle of approximately 38 degrees with respect to the upper surface 2 of the section.
0 against the welded part of the upper surface 2,
In this state, the spindle 21 is rotated while maintaining the above-mentioned approximately 38-degree inclined state, that is, the section 1 is moved in parallel to the horizontal and vertical directions as shown in Fig. 1 A, B, C, and D. By moving linearly in the longitudinal direction of the welded part along the shape of the inner surface 5, the upper welding tension 6 and the first vertical part 5 ₁ and the first vertical part 5 1 at the inside corner are moved.
Welding tensions 6 ₁ , 6 ₂ , 6 ₃ , which occur in the horizontal portion 5 2 , _the second vertical portion 5 3 , the second horizontal portion 5 ₄ , and the _third horizontal portion 5 ₅ ,
6 ₄ and 6 ₅ can be removed.

When the spindle 21 passes through the third vertical part 11, the spindle 21 is turned downward so that the angle is approximately 38 degrees with respect to the lower surface 3 as shown in FIG. By moving along the shape of 3, the welding tension at the bottom can be removed. By the above operations, the outer portions of the welding tension 6 formed at the upper part, inside corner, and lower part can be removed as shown in FIG. 13.

The spindle 21 may be moved, for example, by numerical control to follow the shapes of the upper surface 2, inner surface 5, and lower surface 3 of the section 1, that is, the shapes of the upper, corner, and lower parts of the welded part. This makes it possible to automate the removal of the welding tension, and to remove the welding tension immediately in response to any cross-sectional shape.

As shown in FIGS. 3 to 8, the rotary blade 20 has a pair of triangular portions 23, 23 provided on the shaft portion 22 in a substantially conical shape with an apex angle of approximately 76 degrees. A blade portion 24 is formed at the tip of each of the blades 23, 23. The rotary blade 20 further has blade portions 24 formed on one side in the rotational direction of the triangular portion 23, at the upper end of the maximum diameter, and on the shaft portion 22, and these blade portions 24 are shown in FIG. As shown, it is used to remove the weld tension ₆₆ at the welded portion of the airtight material fitting groove 13. That is, while rotating and lowering the rotary blade 20 in a vertical position relative to the airtight material fitting groove 13, a part of the airtight material fitting groove 13 is notched as shown by H in FIG. 2, and then the airtight material is fitted. Insert it into the matching groove 13, and
By moving along the airtight material fitting groove 13 as _shown in FIG. become able to.
Incidentally, when the rotary blade 20 reaches the position shown in FIG. Note that the rotary blade 20 is not limited to the shape described above.

Next, the reason why the apex angle of the rotary blade 20 is approximately 76 degrees and the inclination angle of the spindle 21 is approximately 38 degrees will be described.

As shown in FIG. 14, the welding tension 6 1 and the first horizontal wall 8 are generated in the first vertical portion 5 ₁ at the inside corner where the first vertical walls ₇ of a pair of sections are welded facing each other at right angles. Corners that are at right angles to each other in the first vertical portion 5 ₁ welded to each other and the weld tension 6 ₂ generated in the continuous first horizontal portion 5 ₂ , that is, the first vertical portion 5 ₁ and the first horizontal portion 5 To remove the welding tension at the corners where ₂ are continuous and at 90 degrees to each other, use the rotary blade 2.
0 so that the top 20a reaches the corner of the welding tension. However, since the rotational center line 20' passing through the top 20a of the rotary blade 20 is inclined with respect to the horizontal part, the apparent apex angle of the rotary blade 20 when viewed from the plane of the section becomes larger than the actual apex angle. If the apex angle of the rotary blade 20 is 90 degrees or more, the above-mentioned apparent apex angle will be 90 degrees or more, so when the apex 20a of the rotary blade 20 is pressed against the welded corner, the rotary blades 20 will not touch each other. The apex angle of the rotary blade 20 needs to be 90 degrees or less because it will interfere with the first vertical walls 7, 7 facing each other at right angles.

Furthermore, as shown in FIG. 15, the weld tension 6 ₁ formed on the first vertical portion 5 ₁ spans the pair of first vertical walls 7, 7 that are perpendicular to each other, so the weld tension 6 ₁ is In order to remove the rotary blade 20, it is necessary to uniformly contact the pair of first vertical walls 7, 7 that are perpendicular to each other, so the apparent apex angle of the rotary blade 20 must be 90 degrees, and spindle 2
The inclination angle of 1 is set to 1/2 of the apex angle of the rotary blade 20, and if the rotary blade 20 is not brought into uniform contact with the first horizontal wall 8 and the upper surface 2, the weld tension ₆₂ and the upper part generated on the first horizontal part ₅₂ will be removed. Since the weld tension 6 cannot be removed,
For both reasons, the apex angle of the rotary blade 20 must be approximately 76 degrees, and the inclination angle of the spindle 21 must be approximately 38 degrees.

That is, as shown in Fig. 16 A and B, if the apex angle of the rotary blade 20 is 2θ, the height is a, the radius is b, and the apparent height is c, when viewed from a plane (first vertical When removing the weld tension 6 ₁ that has occurred on part 5 ₁ ), the apparent apex angle of 6 1 is 90 degrees, so b = a
From the relationship tanθ, c=a cos, tan45°=a tanθ/a cosθ (1).

From equation (1), 1=tanθ/cosθ...(2), and by substituting the relationship tanθ=sinθ/cosθ into equation (2), we get 1=sinθ/cosθ/cosθ=sinθ/cos ² θ, and sinθ= cos ² θ …(3), and by substituting the relationship cos ² =1−sin ² θ into equation (3), we get sinθ=1−sin ² θ, ∴sin ² θ+sinθ−1=0 …(4) Become.

Here, if sin θ = X, equation ( 4 ) becomes X + Set to 0.618.

As a result, since sinθ≒0.618, θ≒
It becomes 38.17°.

Therefore, the apex angle of the rotary blade 20 may be 76 degrees or a slightly smaller or slightly larger angle, that is, approximately 76 degrees, and the inclination angle may be 1/2 of the apex angle, that is, approximately 38 degrees. .

Effects of the invention The ends of the pair of synthetic resin shaped members 1, 1 cut at 45 degrees are welded with their inner surfaces 5, 5 facing each other at right angles, and the vertical part of the welded part and the vertical part are continuous. This is a method for removing welding tension that occurs at an inside corner that has a horizontal part, and uses a rotary blade 20 that has an apex angle of about 76 degrees so that the center line of rotation passing through the top 20a of the rotary blade 20 is at the horizontal part of the inside corner. Approximately 38 against
With the apex 20a in contact with the welded part at an angle of inclination, while rotating the rotary blade, the vertical part of the inside corner,
Since the blades are moved in parallel along the horizontal part, when moving in the vertical part, the apparent apex angle when viewed from the plane of the rotary blade 20 is approximately 90 degrees, and the rotary blades are attached to the inner surfaces 5, 5 facing each other. 20 are in even contact with each other, the welding tension on the vertical part can be neatly scraped off.
Moreover, since the apex angle of the rotary blade 20 is approximately 76 degrees, it is possible not only to cleanly scrape away the weld tension in the continuous vertical and horizontal parts, but also to ensure that the rotation center line passing through the apex 20a of the rotary blade 20 is in the horizontal part. omitted for
Since it is slanted at 38 degrees, it is possible to cleanly scrape away the welding tension on the horizontal part.

Therefore, by simply moving the rotary blade 20 in parallel along the welded part, the welding tension in the vertical and horizontal parts of the inside corner can be removed cleanly and easily.
It is also easy to automate the tensioning work.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view taken along the line -- in FIG. 2, FIG. 2 is a plan view, and FIGS. 3, 4, and 5 are front and side views of the rotary blade. , bottom view, Figures 6, 7, and 8 are - of Figure 3.
9 is a front view of the frame before assembly, 10 is a front view of the assembled state, 11 is a perspective view of the welded part, and 12 is an explanation of the welding tension. Figure 13 is an explanatory diagram of the removed state,
FIGS. 14 and 15 are explanatory diagrams of the welding tension removing operation, and FIGS. 16A and 16B are schematic diagrams for explaining the apex angle of the rotary blade. 1 is a synthetic resin shaped material, 2 is a top surface, 3 is a bottom surface, 4
5 is the outer surface, 5 is the inner surface, 6 is the welding tension, 20 is the rotary blade, and 20a is the top.

Claims (1)

[Claims] 1 The ends of a pair of synthetic resin shaped members 1 surrounded by an upper surface 2, a lower surface 3, an outer surface 4, and an inner surface 5 were cut at 45 degrees and welded together with the inner surfaces 5 and 5 facing each other at right angles. Weld tension that occurs at the vertical part of the welded part and at the corner part that has a horizontal part continuous with the vertical part 6
In this method, a conical rotary blade 20 having an apex angle of approximately 76 degrees is removed from the top 2 of the rotary blade 20.
While rotating the rotary blade 20 with the rotation center line passing through 0a coinciding with the longitudinal direction of the welded part and with the top part 20a in contact with the welded part with the apex 20a inclined at approximately 38 degrees with respect to the horizontal part, A method for removing welded tension from a synthetic resin shaped material, characterized in that the vertical and horizontal parts of the corner are moved in parallel along the longitudinal direction of the welded parts.