CN113953361A

CN113953361A - Thermoforming machine of automobile stabilizer bar and manufacturing process of stabilizer bar

Info

Publication number: CN113953361A
Application number: CN202111242081.2A
Authority: CN
Inventors: 郭平勇; 金雷
Original assignee: Zhejiang Jinsheng Auto Parts Co ltd
Current assignee: Zhejiang Jinsheng Auto Parts Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-01-21
Anticipated expiration: 2041-10-25
Also published as: CN113953361B

Abstract

The utility model relates to a thermoforming machine of car stabilizer bar and manufacturing process of stabilizer bar relates to auto parts's technical field, which comprises a frame, the frame top is provided with the workstation, the workstation both ends are provided with the mould of two bending respectively, the mould of bending includes a plurality of adaptation sections, and is a plurality of the adaptation section interconnect in proper order, every the radius that the cross-section of adaptation section all is convex and the circular arc corresponds is all inequality, the workstation is provided with and is used for making the mould of bending stretches out/retracts the slide device of workstation. This application has the demand that the mould of bending just can adapt to the multiple radian of bending of tubular product for the higher effect of thermoforming machine's suitability.

Description

Thermoforming machine of automobile stabilizer bar and manufacturing process of stabilizer bar

Technical Field

The application relates to the technical field of automobile parts, in particular to a thermoforming machine of an automobile stabilizer bar and a manufacturing process of the stabilizer bar.

Background

In order to improve the ride comfort of the vehicle, the suspension stiffness is usually designed to be relatively low, but the ride stability of the vehicle is affected. Therefore, a stabilizer bar structure is required in the suspension system to improve the roll stiffness of the suspension and reduce the vehicle body roll angle.

The stabilizer bar is a torsion bar spring made of spring steel, is approximately U-shaped, and is usually formed by heating and bending a straight pipe.

If the Chinese patent with the publication number of CN213104197U and the application date of 2020, 7 and 31 discloses a stabilizer bar thermoforming machine, which comprises a workbench, wherein two bending dies which are symmetrically distributed at left and right are arranged on the workbench, a supporting block is arranged between the two bending dies, the front side surfaces of the two bending dies are flush with the front side surface of the supporting block to form a supporting surface, a pressing block which is in press fit with the front side of the supporting surface is arranged on the front side of the supporting surface, and the pressing block is driven by a first oil cylinder to move back and forth; the outer side surfaces of the two bending dies are arc-shaped bending surfaces, and the outer sides of the arc-shaped bending surfaces are provided with swing arms matched with bending; the rear of the outer side of the bending die is connected with a bending seat, a fixed block is arranged on the bending seat, a movable block matched with the bending is arranged on the outer side of the fixed block, the movable block is driven by a third oil cylinder to move obliquely, a fourth oil cylinder is arranged on the rear of the bending die, a positioning head is connected in a transmission mode with the fourth oil cylinder, and the positioning head is driven by the fourth oil cylinder to position the inner side of a stabilizer bar between the bending die and the bending seat.

With respect to the related art among the above, the inventors consider that the following drawbacks exist:

the degree of buckling and the arc angle of its department of buckling of stabilizer bar of different models all can be distinguished, and the mould of bending among the above-mentioned stabilizer bar thermoforming machine, its lateral surface sets up to the arc face of bending, and the arc is bent the central angle of face and the radius relatively fixed of circle for the arc shape of the fashioned stabilizer bar of bending is invariable relatively, if need bend out different circular arcs, the difficult adaptation of above-mentioned mould of bending, thermoforming machine's suitability is relatively poor.

Disclosure of Invention

In order to enable the thermoforming machine to bend more different arcs, the application provides a thermoforming machine of an automobile stabilizer bar and a manufacturing process of the stabilizer bar.

In a first aspect, the application provides a thermoforming machine for an automobile stabilizer bar, which adopts the following technical scheme:

the utility model provides a thermoforming machine of car stabilizer bar, includes the frame, be provided with the workstation in the frame, the workstation both ends are provided with two bending die respectively, the die of bending includes a plurality of adaptation sections, and is a plurality of the adaptation section interconnect in proper order, every the cross-section of adaptation section all is convex and the radius that the circular arc corresponds is all inequality, the workstation is provided with and is used for making the die of bending stretches out \ retraction the slide device of workstation.

Through adopting above-mentioned technical scheme, because the mould of bending includes a plurality of adaptation sections, and the cross-section of every adaptation section all is convex and the radius that the circular arc corresponds is all inequality, like this, only need operate the displacement device, changes the position of the mould of bending, makes corresponding adaptation section and tubular product contact, just can satisfy the different demands of tubular product to the circular arc, need not the fifty percent discount and bends the mould and change for thermoforming machine's suitability improves.

Optionally, the sliding device comprises a driving mechanism and a locking mechanism, the driving mechanism is installed on the workbench, the locking mechanism is connected to the driving mechanism, the locking mechanism is arranged at both ends of the workbench, and the locking mechanism is connected with the bending die and clamps the bending die.

Through adopting above-mentioned technical scheme, actuating mechanism drive locking mechanism work, the mould of bending that will lock originally loosens, then the mould of bending that slides manually, and the position of corresponding adaptation section has been adjusted, and operating actuating mechanism again makes locking mechanism will bend the mould and press from both sides tightly again.

Optionally, the inside cavity of workstation sets up, actuating mechanism includes drive wheel and handle, the drive wheel rotate install in the workstation inner wall, handle fixed connection in the drive wheel, the handle is located the workstation is outside, actuating mechanism drives two respectively locking mechanism presss from both sides tightly bend the mould or loosen bend the mould.

By adopting the technical scheme, the handle is rotated, the handle drives the driving wheel to rotate, and the driving wheel rotates in the same direction and simultaneously drives the two locking mechanisms to perform clamping/loosening synchronous actions.

Optionally, the driving mechanism further includes a first rack and a second rack, the first rack and the second rack are horizontally slidably mounted on the inner wall of the workbench, the first rack and the second rack are respectively meshed with the upper end and the lower end of the driving wheel, and the first rack and the second rack are respectively connected with the two locking mechanisms.

By adopting the technical scheme, when the driving wheel rotates, the first rack and the second rack are respectively meshed with the upper end and the lower end of the driving wheel, and the instantaneous speed directions of the upper end and the lower end of the driving wheel are opposite, so that the first rack and the second rack slide in opposite directions, and the two locking mechanisms can perform synchronous clamping/loosening actions.

Optionally, a mounting opening is formed in a side wall of the workbench, the bending die is arranged in the mounting opening in a penetrating mode, the locking mechanism comprises a first assembly and a second assembly, the first assembly and the second assembly are respectively arranged on two opposite side walls of the mounting opening in an opposite direction, and the first assembly and the second assembly are perpendicular to the direction of the length of the bending die and clamp the bending die tightly.

Through adopting above-mentioned technical scheme, first subassembly and second subassembly subtend set up, will bend the mould and press from both sides tightly in the centre, if need will bend the mould and loosen, as long as make at least one in first subassembly and the second subassembly slide along the direction of keeping away from the mould of bending, just can cancel the fastening of bending the mould.

Optionally, the first assembly includes a first guide rod, a first spring and a first clamping block, the first guide rod is slidably mounted on the side wall of the workbench along the axial direction, the first spring is sleeved on the first guide rod, and the first clamping block is fixedly connected to the first guide rod; the second assembly comprises a second guide rod, a second spring and a second clamping block, the second guide rod is arranged on the side wall of the workbench in a sliding mode along the axial direction, the second spring is sleeved on the second guide rod, the second clamping block is fixedly connected to the second guide rod, and the bending die is clamped between the first clamping block and the second clamping block.

By adopting the technical scheme, the first guide rod and the second guide rod can slide along the axial direction, so that the first clamping block and the second clamping block can move away from/close to the bending die, and the clamping and loosening of the bending die are realized.

Optionally, the adaptation section includes a circular arc section and a straight line section, an end of the straight line section is connected with an end of the circular arc section, and the straight line section is tangent to the circular arc section.

Through adopting above-mentioned technical scheme, the straightway is used for being connected with locking mechanism, and circular arc section and straightway are tangent, and the mild transition makes the radian of bending of tubular product mild, improves the quality of bend.

Optionally, one surface of the first clamping block, which is close to the bending die, is provided with clamping block sawteeth, the lateral surface of the straight line section of the bending die is provided with die sawteeth, and the clamping block sawteeth are meshed with the die sawteeth.

Through adopting above-mentioned technical scheme, if only rely on the frictional force locking mould of bending of first clamp splice and second clamp splice, can make the mould of bending produce the skew when compressed more easily, consequently set up corresponding sawtooth at first clamp splice and straightway, more firm when making the mould of bending by the centre gripping.

Optionally, inclined planes are arranged at the ends, far away from the driving wheel, of the first rack and the second rack, an inclined plane is also arranged at the end, close to the driving mechanism, of the first clamping block, when the first rack and the second rack slide towards the first clamping block, the two inclined planes are in contact, and the first guide rod slides towards the direction far away from the bending die.

By adopting the technical scheme, when the first rack or the second rack slides to the first clamping block, the two inclined surfaces are in mutual contact, then along with the continuation of sliding, the inclined surface of the rack pushes the inclined surface of the clamping block, so that the first clamping block slides towards the direction away from the bending die, and the fastening to the bending die is cancelled.

In a second aspect, the present application provides a manufacturing process of a stabilizer bar, which adopts the following technical scheme:

a manufacturing process of a stabilizer bar is based on the thermoforming machine of the automobile stabilizer bar; the method comprises the following steps:

s1: blanking, namely separating tubular raw materials from a metal base material to obtain pipes, so that the length of each section of pipe meets the length requirement of the stabilizing rod;

s2: end part processing, namely punching and slicing the end part of the pipe to facilitate subsequent positioning and processing of the end part of the pipe;

s3: thermoforming, namely heating the pipe by a thermoforming machine, heating the pipe to a certain degree, changing the hardness and the extensibility of the pipe, and bending the pipe into a required angle and radian at a corresponding place;

s4: heat treatment, after the pipe bending is finished, the structure and the performance of the metal pipe are improved through heating, heat preservation and cooling so as to achieve the expected effect;

s5: checking, namely checking the processing quality of the pipe after the heat treatment of the pipe is finished, and screening defective and unqualified pipes;

s6: performing shot blasting, namely performing shot blasting and polishing treatment on the surface of the pipe by using a shot blasting machine, removing oxide impurities on the surface of the pipe, improving the appearance quality, modifying the microstructure of the pipe, changing the roughness of the outer surface of the pipe, improving the fatigue fracture resistance of the pipe and prolonging the fatigue life;

s7: surface treatment, namely degreasing, washing and vitrification treatment are carried out on the surface of the pipe;

s8: drying, namely heating and blowing the pipe to dry the pipe;

s9: spraying powder, and finally uniformly spraying epoxy resin on the surface of the pipe.

In summary, the present application includes at least one of the following beneficial technical effects:

1. one bending die can meet the requirements of various bending radians of the pipe, so that the applicability of the thermoforming machine is higher;

2. the mould of bending carries out centre gripping and locking through locking mechanism, and when needs change the processing radian, operation actuating mechanism, then manual will bend the mould and adjust corresponding circular arc section, locks once more, and the adjustment process is simple swift.

Drawings

Fig. 1 is a schematic view of the overall structure of the present application.

Fig. 2 is a schematic structural view of the bending die of the present application.

Fig. 3 is a schematic sectional structure of the work table of the present application.

Fig. 4 is a side view of the table of the present application.

Fig. 5 is a schematic view of the drive wheel and rack configuration of the present application.

Fig. 6 is a schematic structural view of a first assembly and a second assembly of the present application.

Reference numerals: 100. a frame; 110. a work table; 111. an installation port; 200. bending the die; 210. a circular arc section; 220. a straight line segment; 221. saw teeth of the die; 300. a drive mechanism; 310. a drive wheel; 320. a handle; 330. a first rack; 340. a second rack; 400. a locking mechanism; 410. a first component; 411. a first guide bar; 412. a first spring; 413. a first clamping block; 4131. a clamping block sawtooth; 420. a second component; 421. a second guide bar; 422. a second spring; 423. a second clamp block; 500. a support block; 600. and (6) a bevel block.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses thermoforming machine of car stabilizer bar, refer to fig. 1, including frame 100, be provided with workstation 110 on the frame 100, workstation 110 subtend both ends are provided with two bending die 200 respectively, bending die 200 includes a plurality of adaptation sections, in this embodiment, a mould includes three adaptation section, the cross-section of every adaptation section all is arc and the radius that the circular arc corresponds is all inequality, workstation 110 is provided with the slide device that is used for making bending die 200 stretch out \ the retraction workstation 110. Operating the sliding device, adjusting the position of the adaptive section of the bending die 200 to enable the corresponding adaptive section to be in contact with the pipe, meeting different requirements of the pipe on the circular arc,

referring to fig. 2, the adaptation section includes a circular arc section 210 and a straight line section 220, an end of the straight line section 220 is connected with an end of the circular arc section 210, the straight line section 220 connected with each other is tangent to the circular arc section 210, and adjacent adaptation sections are connected with each other in sequence.

Referring to fig. 3, the sliding device includes a driving mechanism 300 and a locking mechanism 400, the driving mechanism 300 and the locking mechanism 400 are both mounted on the workbench 110, the locking mechanism 400 is connected to the driving mechanism 300, the locking mechanisms 400 are disposed at both ends of the workbench 110, both the locking mechanisms 400 are driven by the same driving mechanism 300, and the bending die 200 is clamped or loosened.

Referring to fig. 3 and 4, the inside of the working platform 110 is hollow, the driving mechanism 300 includes a driving wheel 310, a handle 320, a first rack 330 and a second rack 340, the driving wheel 310 is rotatably mounted on the inner wall of the working platform 110, the rotation axis is horizontally arranged, the handle 320 is coaxially and fixedly connected to the driving wheel 310, and the handle 320 extends out of the working platform 110. The first rack 330 is slidably mounted on the inner wall of the working platform 110 in the horizontal direction, the teeth face downward, the first rack 330 is meshed with the upper end of the driving wheel 310, the second rack 340 is slidably mounted on the inner wall of the working platform 110 in the horizontal direction, the teeth face upward, and the second rack 340 is meshed with the lower end of the driving wheel 310.

When the handle 320 is rotated, the handle 320 drives the driving wheel 310 to rotate, and the driving wheel 310 rotates in the same direction and simultaneously drives the first rack 330 and the second rack 340 to synchronously slide in opposite directions.

Installing port 111 has all been seted up to the both ends lateral wall of workstation 110, and the equal fixedly connected with supporting shoe 500 of inner wall of installing port 111, mould 200 of bending wear to locate in installing port 111, and mould 200 of bending's upper end is erect on supporting shoe 500, and mould 200 of bending's lower extreme stretches into in installing port 111. Both ends that the top surface of workstation 110 is close to both sides installing port 111 all are the inclined plane setting for the top surface of workstation 110 can the gentle transition to the top surface of mould 200 of bending.

Referring to fig. 5 (the working table 110 and the bending die 200 are not shown), the locking mechanism 400 includes a first component 410 and a second component 420, and the locking mechanisms 400 are mounted on the inner walls of the two mounting openings 111 and are symmetrically arranged. The first module 410 and the second module 420 are respectively mounted on two opposite side walls of the same mounting opening 111.

The first assembly 410 and the second assembly 420 clamp the bending mold 200 along a direction perpendicular to the length of the bending mold 200, and if the bending mold 200 needs to be loosened, the fastening to the bending mold 200 can be cancelled as long as at least one of the first assembly 410 and the second assembly 420 slides along a direction far away from the bending mold 200.

Referring to fig. 6, the first assembly 410 includes a first guide rod 411, a first spring 412 and a first clamping block 413, the first guide rod 411 is slidably disposed in the sidewall of the workbench 110 along the axial direction, the first spring 412 is sleeved on the first guide rod 411, the first clamping block 413 is fixedly connected to one end of the first guide rod 411 extending out of the sidewall of the workbench 110, and two ends of the first spring 412 are respectively abutted against the sidewall of the workbench 110 and the first clamping block 413.

The second assembly 420 includes a second guide rod 421, a second spring 422 and a second clamping block 423, the second guide rod 421 slides axially to penetrate through the sidewall of the workbench 110, the second guide rod 421 is sleeved with the second spring 422, the second clamping block 423 is fixedly connected to one end of the second guide rod 421 extending out of the sidewall of the workbench 110, two ends of the first spring 412 are respectively abutted against the sidewall of the workbench 110 and the first clamping block 413, and the bending mold 200 is clamped between the first clamping block 413 and the second clamping block 423.

Referring to fig. 2 and 6, one surface of the first clamping block 413 close to the bending mold 200 is provided with clamping block saw teeth 4131, the clamping block saw teeth 4131 are arranged in a vertical direction, the side surface of the straight section 220 of the bending mold 200 is provided with mold saw teeth 221 corresponding to the clamping block saw teeth 4131, and the clamping block saw teeth 4131 are engaged with the mold saw teeth 221.

Referring to fig. 5 and 6, both ends of the first rack 330 and the second rack 340 far away from the driving wheel 310 are fixedly connected with a slope block 600, one end of the slope block 600 near the first clamping block 413 is provided with a slope, one end of the first clamping block 413 near the driving mechanism 300 is also provided with a slope, when the first rack 330 and the second rack 340 slide towards the first clamping block 413, the two slopes are in contact, and the first guide rod 411 slides towards the direction far away from the bending die 200.

When the first rack 330 or the second rack 340 slides towards the first clamping block 413, the first rack 330 or the second rack 340 contacts with the inclined surface of the first clamping block 413, and then along with the continuation of the sliding, the inclined surface of the first rack 330 or the second rack 340 pushes the inclined surface of the clamping block, so that the first clamping block 413 slides towards the direction away from the bending die 200, and the clamping block saw teeth 4131 are disengaged from the die saw teeth 221, thereby canceling the fastening of the bending die 200.

The implementation principle of the thermoforming machine of the automobile stabilizer bar is as follows:

because the mould 200 of bending includes a plurality of adaptation sections, and the cross-section of every adaptation section all is convex and the radius that the circular arc corresponds is all inequality, like this, only need operate the displacement device, changes the position of mould 200 of bending, makes corresponding adaptation section and tubular product contact, just can satisfy the different demands of tubular product to the circular arc, need not to change curved mould 200 of fifty percent discount for thermoforming machine's suitability improves.

Aiming at different bending requirements of different pipes, a bending die 200 originally installed on a thermoforming machine needs to be adjusted first, a driving mechanism 300 is operated, a handle 320 is rotated, the handle 320 drives a driving wheel 310 to rotate, the driving wheel 310 rotates in the same direction and simultaneously drives a first rack 330 and a second rack 340 to slide towards the direction close to two installation openings 111 respectively, the handle 320 is continuously rotated until inclined planes on the first rack 330 and the second rack 340 are contacted with inclined planes on two first clamping blocks 413 respectively, the first rack 330 and the second rack 340 push the two first clamping blocks 413 through the inclined planes, the two first clamping blocks 413 are enabled to slide towards the direction far away from the bending die 200, after the inclined planes are slid to a certain degree, clamping block sawteeth 4131 are disengaged from die sawteeth 221, and the first clamping blocks 413 are not fastened to the bending die 200 any more.

Then, the first clamping blocks 413 are kept in a loosened state, the bending die 200 is manually slid, the position of the bending die 200 is changed, and the corresponding adaptive sections on the bending die 200 are located at the mounting openings 111, so that the corresponding adaptive sections can be in contact with the pipe.

After the position of the bending die 200 is adjusted, the handle 320 is rotated reversely, the driving wheel 310 drives the first rack 330 and the second rack 340 to slide close to the driving wheel 310, the inclined planes on the first rack 330 and the second rack 340 are not contacted with the inclined plane on the first clamping block 413 any more, the first clamping block 413 is not limited any more, the first clamping block 413 slides towards the bending die 200 under the action force of the first spring 412 until the clamping block sawteeth 4131 are meshed with the corresponding die sawteeth 221 again, and the bending die 200 is fastened and locked again.

Based on the thermoforming machine of above-mentioned car stabilizer bar, this application embodiment still discloses a manufacturing process of stabilizer bar, includes following step:

s8: drying, namely heating and blowing the pipe to dry the pipe;

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a thermoforming machine of car stabilizer bar, includes frame (100), be provided with workstation (110) on frame (100), its characterized in that: workstation (110) both ends are provided with two bending die (200) respectively, bending die (200) include a plurality of adaptation sections, and are a plurality of adaptation section interconnect in proper order, every the cross-section of adaptation section all is convex and the radius that the circular arc corresponds is all inequality, workstation (110) are provided with and are used for making bending die (200) stretch out \ retract workstation (110)'s the displacement device.

2. A thermo-forming machine of an automobile stabilizer bar according to claim 1, characterized in that: the sliding device comprises a driving mechanism (300) and a locking mechanism (400), the driving mechanism (300) is installed on the workbench (110), the locking mechanism (400) is connected to the driving mechanism (300), the two ends of the workbench (110) are provided with the locking mechanism (400), and the locking mechanism (400) is connected with the bending die (200) and clamps the bending die (200).

3. A thermo-forming machine of an automobile stabilizer bar according to claim 2, characterized in that: the inside cavity of workstation (110) sets up, actuating mechanism (300) include drive wheel (310) and handle (320), drive wheel (310) rotate install in workstation (110) inner wall, handle (320) fixed connection in drive wheel (310), handle (320) are located workstation (110) are outside, actuating mechanism (300) drive two respectively locking mechanism (400) press from both sides tightly bend mould (200) or loosen bend mould (200).

4. A thermo-forming machine of an automobile stabilizer bar according to claim 3, characterized in that: the driving mechanism (300) further comprises a first rack (330) and a second rack (340), the first rack (330) and the second rack (340) are horizontally slidably mounted on the inner wall of the workbench (110), the first rack (330) and the second rack (340) are respectively meshed with the upper end and the lower end of the driving wheel (310), and the first rack (330) and the second rack (340) are respectively connected with the two locking mechanisms (400).

5. A thermo-forming machine of an automobile stabilizer bar according to claim 4, characterized in that: installing port (111) have been seted up to the lateral wall of workstation (110), mould (200) of bending wears to locate in installing port (111), locking mechanism (400) include first subassembly (410) and second subassembly (420), first subassembly (410) with second subassembly (420) install respectively in the both sides wall of installing port (111) subtend, first subassembly (410) with second subassembly (420) are along the perpendicular to mould (200) length of bending's direction will mould (200) of bending presss from both sides tightly.

6. A thermo-forming machine of a stabilizer bar for an automobile according to claim 5, characterized in that: the first assembly (410) comprises a first guide rod (411), a first spring (412) and a first clamping block (413), the first guide rod (411) is installed on the side wall of the workbench (110) in a sliding mode along the axial direction, the first spring (412) is sleeved on the first guide rod (411), and the first clamping block (413) is fixedly connected to the first guide rod (411); the second assembly (420) comprises a second guide rod (421), a second spring (422) and a second clamping block (423), the second guide rod (421) is installed on the side wall of the workbench (110) in a sliding mode along the axial direction, the second spring (422) is sleeved on the second guide rod (421), the second clamping block (423) is fixedly connected to the second guide rod (421), and the bending die (200) is clamped between the first clamping block (413) and the second clamping block (423).

7. A thermo-forming machine of an automobile stabilizer bar according to claim 6, characterized in that: the adaptation section comprises an arc section (210) and a straight line section (220), the end of the straight line section (220) is connected with the end of the arc section (210), and the straight line section (220) is tangent to the arc section (210).

8. A thermo-forming machine of a stabilizer bar for an automobile according to claim 7, characterized in that: one surface, close to the bending die (200), of the first clamping block (413) is provided with clamping block sawteeth (4131), die sawteeth (221) are arranged on the side face of the straight line section (220) of the bending die (200), and the clamping block sawteeth (4131) are meshed with the die sawteeth (221).

9. A thermo-forming machine of an automobile stabilizer bar according to claim 6, characterized in that: the first rack (330) and the second rack (340) are far away from one end of the driving wheel (310) are provided with inclined planes, one end of the first clamping block (413) close to the driving mechanism (300) is also provided with an inclined plane, when the first rack (330) and the second rack (340) slide towards the first clamping block (413), the two inclined planes are in contact, and the first guide rod (411) slides towards the direction far away from the bending die (200).

10. A manufacturing process of a stabilizer bar is characterized in that: a thermo-forming machine of a stabilizer bar for an automobile according to any one of claims 1 to 9, comprising the steps of:

s8: drying, namely heating and blowing the pipe to dry the pipe;