JPS60218B2 - Secondary forming equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention prevents eccentricity of the stopper forming piece when expanding the diameter of the Sekiguchi side of a thermoplastic resin pipe and installing the stopper forming piece as a shield at the inner part of the expansion. The present invention relates to an improved device that enables proper secondary processing.

When the Sekiguchi end (B) of a long or short pipe formed by Kamide molding is used as a receiving part, a method is known in which a stopper forming piece is installed at the back of this receiving part. ing.

This stopper forming piece is extremely effective in preventing damage to the back of the receptacle due to the insertion force of the insertion tube inserted into the receptacle, and furthermore, in order to maintain an appropriate insertion allowance. This is extremely practical in that it can simplify and ensure connection work. The most common method for installing such a stopper-forming piece in the back of the socket is to fit the stopper-forming piece in an appropriate position on the outer periphery of the secondary molded core, and then insert the stopper-forming piece into the inner part of the socket. This is a method in which the diameter of the resin pipe is expanded by pushing it into the mouth of the heated and softened resin pipe, and a stopper forming piece is provided at the inner part of the diameter of the pot. For example, Figures 1 to 4 explain a known example in which a stopper forming ring is implanted at the same time as the diameter expanding process. It shows. In the illustrated example, the core 2 is provided with a bulge shaping part 2a, and a guide part 2b is provided at the tip thereof, and a stopper to be provided as a shield on the inner surface of the bulge of the resin pipe 1 is formed at the boundary part. Place ring 3. Then, when the core 2 is pushed in from the entrance after heating and softening the processed part la of the resin pipe 1, the processed part la slides on the guide part 2b, and the stopper forming ring 3
is guided in the direction of the enlarged diameter shaping portion 2a. In this way, the entrance end of the resin pipe 1 is shaped into a socket, and the stopper forming ring 3 is provided at the inner periphery of the end. As is clear from the example diagram above, the expansion adjustment section 2
It is best to provide a guide part 2b at the tip of a to facilitate the pushing operation of the core 2, and the guide part 2b has a guide part 2b that is connected to the axis of the processed part (expanded diameter part) la and the non-processed part. An alignment effect that prevents eccentricity with respect to the axis of portion lb is also expected. For this reason, the guide portion 2b is located inside the unprocessed portion lb of the resin tube 1 (
In other words, it is desirable to design it so that it is equal to the original inner diameter of the resin pipe 1 to be processed. However, the inner diameter of the resin tube 1 that is molded using an extrusion molding machine, etc. is allowed to have a certain degree of tolerance (usually about 0.5%) within the specifications, and the minimum and maximum inner diameter of the resin tube 1 that passes the standard is allowed. There is a considerable difference between (maximum 0.5% 0.5% = 1.0%
degree). For this reason, when designing the guiding part 2b of the core 2, we designed the guide part 2b so that even the resin tube with the smallest inner diameter within the standard can be smoothly guided.
It is normal to set the outer diameter to be equal to the smallest inner diameter. For this reason, when processing a resin tube 1 having the maximum inner diameter within the standard using the core 2 as described above, a gap is created between the guide portion 2b and the inner surface of the resin tube 1, making it impossible to obtain an alignment effect. That is, FIG. 2 shows a processing state in which the centering effect of the guide portion 2b cannot be obtained, and FIGS. 3 and 4 show the resin tube 1 obtained through such processing conditions, which is also clear from FIG. In this way, the guide portion 2b is not in close contact with the inner surface of the resin tube 1, and a gap is created in the upper part of the drawing. In the resin pipe 1 that has been shaped in this manner, the processed part (widening part) is formed as shown in FIGS. 3 and 4.
The axis P of la and the axis P2 of the non-processed portion lb do not match and are eccentric, resulting in distorted inner and outer diameters and furthermore, the shielding state of the stopper forming ring 3 becomes extremely unstable.
As a result, not only does the commercial value of the processed resin pipe 1 decrease, but the stopper forming ring 3 may fall off due to a slight external force, and the axes of each pipe may be aligned in a straight line when installing horizontal piping or slightly inclined piping. This causes various disadvantages, such as making it difficult to maintain a constant slope, decreasing the flow path coefficient, and increasing the accumulation of foreign substances. (Refer to No. 5) In addition, Fig. 1 shows the case of machining a pile resin pipe 1 with the minimum inner diameter within the standard, and the inner diameter of the resin pipe 1 and the outer diameter of the guide group 2b match to obtain a proper machining condition. However, in the actual work process, even if there are only a few cases where such a proper state is obtained, in most cases the eccentric machining state will be more or less as shown in FIG. 2. In addition, in the illustrated example, the process of installing a stopper forming ring at the same time as the sleeve expansion process was explained. Exactly the same problem is pointed out when the inner surface of the workpiece is defined by the core 2 and the outer shape is pressed from the outer periphery to shape the workpiece. The purpose was to widen the entrance part of the thermoplastic resin pipe to form a socket part, and also to shield or fix a stopper forming piece to the deep inner surface of the socket part. The purpose of this invention is to provide an apparatus that can properly perform secondary processing into a desired shape by preventing deviations in the center of the machining between the processed and non-processed parts. It is an object of the present invention to provide a secondary processing device that can accurately match the two center centers and stably install or fix the stopper forming piece even if there is an error. The secondary forming device of the present invention has a structure in which a new alignment device is provided at the tip of a core that is a forming member, and the alignment mechanism moves in the axial direction by fluid pressure and moves the front and rear surfaces of the core. A thrust taper ring biased by a return spring from at least one side, and a tapered surface disposed on the outer periphery of the thrust taper ring that is biased toward the center and slidably contacts a tapered surface provided on the outer periphery of the ring. It consists of several expanded vertical villages set up around the circumference,
The thrust taper ring is configured to be moved in the axial direction by compressed fluid to increase the diameter of the expanding/reducing member in the radial direction, and to slide back under the action of a return spring to increase the diameter of the expanding member in the center direction. However, the gist is that the diameter expanding/contracting member is configured to be able to concentrically hold the resin tube in contact with the inner surface of the non-softened portion of the resin tube to be processed when in the expansion state. The configuration and effects of the present invention will be explained below based on the drawings, which are examples. However, the following is only a representative example of the present invention, and various designs may be changed in order to achieve the above and later purposes. Any implementation is within the technical scope of the present invention. Figures 6 to 9 are explanatory diagrams illustrating the secondary forming apparatus according to the present invention, Figures 6 and 7 are front views with the upper half cut away, and Figures 8 and 9 are taken along the U-U line in Figures 6 and 7. and W-
It is a sectional view taken along the line W, showing the enlarged shaping portion 2a and the guide portion 2 of the core 2.
A step part is formed at the boundary with the guide part 2b, and the stopper forming ring 3 is attached to the step part, and an alignment device 5 is integrally provided at the tip of the guide part 2b. The alignment device 5 is mainly composed of a thrust taper ring 6 and an expansion/contraction member 7, and FIGS.
, 9 shows a state in which the expanding vertical flea member 7 is expanding and holding the resin tube 1 shown by the imaginary line. As is clear from the diagram, the thrust taper ring 6 is slidably supported by a steel member on the tip of the core 2, that is, on the sliding ring 4 provided on the guide portion 2b, and a step recess is formed on the inner periphery of the tip. An airtight chamber 8 is formed between the sliding shaft 4 and the boss portion 4a at the tip of the sliding shaft 4, and a compressed fluid such as compressed air can be introduced into the airtight chamber 8. A push spring 9 is disposed at the rear end of the yielding ring 6 to bias the ring 6 toward the tip, and an appropriate tapered surface 6a is formed on the outer periphery of the lj ring 6. The diameter expanding/reducing member 7 arranged on the outer periphery of the thrust taper ring 6 has a structure divided into a plurality of parts, and the inner periphery of each diameter expanding/reducing member 7 corresponds to the tapered surface 6a provided on the outer periphery of the thrust booper ring 6. An angular tapered surface is provided, and the entire expanded striped folding member 7 is biased toward convergence by the coil spring 10. Projections 6a' and grooves 7a' are formed as necessary on the tapered surfaces 6a and 7a of the thrust taper ring 6 and the expansion/retraction member 7, so that the expanding bran diameter member 7 is radially aligned with equal gaps. It is configured so that it can be expanded and contracted. In the figure, leakage of compressed fluid from the airtight chamber 8 is prevented by a seal f8 with elastic packing. In the alignment device as shown in the figure, when compressed fluid is not being fed into the airtight chamber 8, the thrust taper ring 6 is pushed forward (to the right in the drawing) by the push spring 9, and the flange member 7
is convergently biased by the coil spring 10 and is compressed as shown in FIGS. 6 and 8. On the other hand, when compressed fluid such as compressed air is injected into the airtight chamber 8, the thrust taper ring 6 moves to the left in the drawing against the push spring 9, as shown in FIG. She is expanded against the 10 convergence forces (Figures 7 and 9). Therefore, when heating and softening the closed end side of the thermoplastic resin pipe 1 to expand it and attaching the stopper forming ring 3 to the inner part of the expansion sparrow, the diameter expanding/reducing member 7 of the concentric device 5 is expanded. If this is applied to the inner periphery of the unsoftened part of the resin pipe 1, the resin pipe 1 will be reliably maintained aligned by the alignment member 5, and the center of the processed part and the mari center of the non-processed part will be aligned. can be matched accurately. In this way, it is possible to completely prevent distortions caused by eccentricity of the processed portion and defects in the installation of the stopper forming ring 3, and a processed resin pipe with high commercial value can be obtained. In particular, the alignment device attached to the processing apparatus of the present invention moves the thrust taper ring 6 only by compressed fluid and a return spring (push spring 9), and aligns the circle formed by the outer peripheral surface of the expansion/contraction member 7. Since the diameter can be freely adjusted, even if there is a tolerance in the inner diameter of the resin tube 1, it will surely come into close contact with the inner circumferential surface of the resin tube 1 and exhibit an alignment effect. For this reason, there is no uneven gap between the resin tube 1 and the guide part 2b as shown in FIG. Such phenomena can be reliably prevented. In the illustrated example, the enlarged diameter member 7 is shown divided into 8 parts, but the enlarged diameter member 7 is adjusted by grinding the broadside in the same 0-circular shape and applying it to at least three locations on the inner circumferential surface of the resin pipe 1. The divisor is not particularly limited as long as the divisor is 30% or more, as long as it is configured so as to maintain the center of gravity. In addition, the armpit diameter reducing member 7 not only has a structure that uniformly contracts the armpit over the entire circumference, but also
It is also possible to adopt a configuration in which at least three locations are locally expanded and contracted to maintain alignment, and the shape, structure, etc. of the expansion and contraction member 7 can be freely selected and determined by the person implementing the present invention. It is something. In addition, in the examples shown in FIGS. 6 and 7, a mechanism is adopted in which an airtight chamber 8 is formed on the inner circumferential surface side of the tip of the thrust taper ring 6, and a push spring 9 is arranged at the other end to bias it in the return direction.
It is also possible to arrange a tension spring in the airtight chamber 8 to bias the thrust taper ring 6 in the return direction.In short, when the compressed fluid is removed from the airtight chamber 8, the thrust taper ring 6 is activated. As long as the return spring can be returned by force, there are no limitations on the arrangement position, material, etc. of the return spring. In the present invention, compressed air is most commonly used as the compressed fluid that acts as a source for controlling the longitudinal diameter, but it is also possible to use a liquid such as pond water. In particular, as is clear from the above explanation, it is necessary that the resin part held by the adjusting device 5 be in a non-softened state, but if cold water is used as the compressed fluid, its cooling effect will cause the resin pipe to soften. 1
This is beneficial because it also has the function of cooling and hardening the supporting portion of the holder. Further, in the illustrated example, the expandable/retractable light member 7 is constructed so that the entire body is converged and biased by the ring spring 101, but the convergence biasing means is not limited to the ring spring 0', and various other biasing mechanisms may be employed. For example, FIG. 10 is a longitudinal cross-sectional view illustrating a secondary processing device equipped with another alignment device 5, and shows a state in which the expandable and retractable member 7 has expanded in diameter. In the alignment device 5 of this example, the enlarged diameter member 7 is supported in the center direction by correspondingly provided sliding pins 12, and each sliding pin 12 is biased in the center direction by a spring 13. .
Therefore, each ore diameter reducing member 7 connected and fixed to the tip of each sliding pin 12 is urged toward the center. In this example as well, the diameter of the expansion/contraction section 7 is reduced by the movement of the thrust taper ring 6 by the compressed fluid introduced into the airtight chamber 8. Therefore, the thrust taper ring 6 is moved by the sliding pin 12. A number of notches 14 corresponding to the number of sliding pins 12 are provided in the thrust taper ring 6 in the ratchet direction so that the thrust taper ring 6 is not obstructed. The other configurations can be understood in the same manner as the example shown in FIGS. The striped diameter is formed by the restoring force of the spring 13. As mentioned above, since the outer diameter of the alignment device 5 used in the present invention can be freely changed according to the inner diameter of the resin tube 1 that is to hold the sea bream core, it is always accurate even if the inner diameter of the resin tube 1 is slightly different. In addition to this, since fluid pressure is used as the operating source for expanding the fringed diameter, a buffering effect is exerted when the sea bream is centered, and there is no risk of damage to the inner circumferential surface of the resin tube 1.

It is also possible to cover the outer periphery of the expansion/contraction flea member 7 with a cushioning material such as rubber to more completely prevent damage to the inner periphery of the resin tube 1, and such design changes are of course within the technical scope of the present invention. Included in the range. The procedure for processing the thermoplastic resin pipe 1 using the apparatus of the present invention as described above is: (1) Pushing the core into the resin pipe 1, and expanding the diameter after the alignment member 5 reaches the unsoftened part. The most common method is to align the member 7 by widening it. Rear resin pipe 1
It is also possible to adopt a method of aligning by pushing the core into the core, or other methods, and these work procedures should be appropriately selected depending on the situation at the work site, and are particularly within the technical scope of the present invention. It is not intended to restrict.

In addition, the shape and structure of the core 2 (particularly the shaping part 2a), which is the main body of the secondary processing apparatus in the present invention, should be appropriately set according to the desired end shape and structure of the resin pipe 1. In addition to the simple structure shown in the above figure, it can of course be applied to the case of obtaining a complex and high-performance receiving part as shown in FIGS. 11 and I2. That is, FIG. This is a case in which the stopper forming ring 3 is shielded at the deep inner surface of the inner surface of the core 2, and a packing engagement groove lc is formed on the inner circumferential surface of the expanded groove 2a of the core 2. The resin tube 1 is also configured to be expandable and contractible, and is tightened from the outer periphery by an outer mold 15. In FIG. At the same time, this is a case where a buckling retaining ring 16 is installed at a proper position on the inner periphery of the wing part, and the expanding shaping section of the core 2 is configured to be capable of expanding stripes, and the buckling retaining ring 16 is installed at the appropriate position. The buckle retaining ring 16 is installed as a shield along with the rounding and stopper forming ring 3. In this way, concave portions and convex portions are further formed on the inner surface of the gunwale processing portion, and the ring is shielded. When installing, a predetermined part of the girth shaping part 2a is configured to be expandable and vertical so that the core 2 can be easily extracted from the resin tube 1 after molding, but these expansion and contraction mechanisms are generally Various known mechanisms can be employed.According to the present invention, even when performing complicated secondary processing as shown in Figs. Similarly, it is possible to reliably align the machining center of the processed part with the axis of the non-processed part.The present invention is constructed as described above, and there is some tolerance in the inner diameter of the resin pipe whose end is to be processed. Even so,
The plastic tube is supported by an alignment device to maintain the correct center of gravity of the vehicle.

Therefore, the opening □ of the resin pipe is widened and a stopper forming ring is installed deep inside the pipe, or a packing engagement groove is formed in the widened section, or a packing stopper piece or the like is installed as a shield. In some cases, the center of the processed part and the center of the unprocessed part may be misaligned, resulting in a distorted processed resin tube, or the shield for the stopper forming ring may become unstable and fall off during connection work. You can solve all problems. Furthermore, since the alignment device provided in the present invention also has the function of guiding the insertion of the resin tube at the tip of the molding device, that is, the core, the insertion work becomes even smoother. Furthermore, since the alignment device employs a mechanism that operates the expansion and contraction member using fluid pressure, there is no risk of excessive load being applied to the alignment support part of the resin pipe, and this adjustment is preferable from a safety perspective. Expected to have a positive effect on the mind. This type of secondary processing of resin pipes can thus be carried out with great precision,
This ensures the shielding of the stopper forming piece and completely prevents eccentric distortion of the socket, increasing the commercial value of secondary processed products and solving problems that occur during the pipe failure process. The significance of the present invention, which has solved all the problems associated with gradient piping, is extremely significant.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and Figures 1 to 4 are for explaining a known example in which a stopper-forming ring is installed as a shield at the inner depth of a resin pipe by expanding the opening side of the pipe. 1st, 2nd
The figure is a cross-sectional side view of the main part, Figure 3 is a partial longitudinal cross-sectional view of the obtained processed resin pipe, Figure 4 is a view taken along the Y-Y line in Figure 3, and Figure 5 is a view of such a pipe. It is an explanatory view when piping construction is carried out using. 6 to 9 are explanatory diagrams of the operating mechanism illustrating the secondary forming apparatus according to the present invention, and FIGS. 6 and 7 are side views of the upper half, and FIGS.
FIG. 9 is a sectional view taken along line U-U and line W-W in FIGS. 6 and 7. FIG. 10 is a longitudinal cross-sectional view of a main part illustrating another secondary forming apparatus according to the present invention, and FIGS. 11 and 12 are cross-sectional views of main parts showing an example of expanding processing by still another secondary forming apparatus according to the present invention. FIG. 1... Resin pipe, 2... Core, la... Processing section (
Expanded part), lb...Unprocessed part, 2a...
・Kohyo Shaping Department, 2b...0 Guide Department, 3...
・Stopper forming ring, P.・・・・ Machining part axis LP
2... Axis center of non-machined part, 5... Aligning device, 6
...Thrust taper ring, 7...Glass member, 6a, 7a...7 upper surface, 8...Airtight chamber, 9...Press Spring, 10...Ring spring, 11...Seal packing, 12...
...Sliding pin, 13... Spring, 14...
・Depth of cut, 15... Outer mold, 16... Batskin retaining ring. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] 1 A secondary forming device used when enlarging the diameter of the opening side of a thermoplastic resin pipe and implanting or fixing a stopper forming piece deep inside the tube, the device has an adjustable core tip. A centering device is provided, and the centering device includes a thrust taper ring that moves in the axial direction by fluid pressure and is biased by a return spring from at least one of its front and rear surfaces, and a thrust taper ring that is oriented toward the center on the outer periphery of the thrust taper ring. The thrust taper ring is composed of a plurality of diameter expanding and contracting members whose inner periphery is provided with a tapered surface that is placed under pressure and is slidably in contact with a tapered surface provided on the outer periphery of the ring, and the thrust taper ring is moved in the axial direction by compressed fluid. The diameter of the expanding/contracting member is expanded in the radial direction, and the diameter of the expanding/contracting member is reduced in the center direction by sliding return due to the action of a return spring. A secondary forming apparatus characterized in that it is configured to concentrically hold a resin tube in contact with the inner circumferential surface of a non-softened portion of the resin tube.