DE3514485A1 - Method and apparatus for the production of slot-bridge filter tubes - Google Patents

Abstract

A description is given of a method and an apparatus for the production of slot-bridge filter tubes. The method is distinguished by the fact that the slot bridges are pressed into the finished tube, thereby eliminating the risk of deformation of the slot bridges during further operations in the production of the tube. The apparatus for carrying out this method has a supporting body which is provided with a multiplicity of radially movable cutting tools and is arranged inside the tube. The cutting tools are moved radially outwards and, in the process, shear off corresponding portions of the tube wall to form the slot bridges. As reaction elements use is made of dies which are moved against the surface of the tube from outside.

Description

Method and device for

Positioning of Schlitzbrückon Filter Tubes The present invention relates to a method for the production of Schlitzbicken filter tubes according to the Preamble of claim 1.

Slot bridge filter tubes are tubes that are used for filters or filters. Drainage purposes can be used. They usually consist of stretchable metals and wise in their walls have openings through which, for example, the one surrounding the pipes The soil is drained. To penetrate the soil surrounding the pipes to prevent the openings, these are designed so that parts of the pipe wall are arranged offset radially outwardly with respect to the rest of the pipe wall, wherein these parts are connected like a bridge to the rest of the pipe wall. the Openings are laterally between the bridge-like parts and the rest Tube wall formed.

In a frequently used embodiment, a Slotted bridge through several, for example three, radially outer pipe wall sections formed, which with each other and with the rest of the pipe wall by inclined web sections are connected. At this Embodiment are thus per slot bridge three radially protruding and axially aligned sections are provided, two lateral openings are assigned to each protruding section. at Another embodiment is a slot bridge through six of such formed radially protruding portions, each in pairs in the circumferential direction are arranged next to each other #. Further embodiments are naturally also possible.

The invention relates to the production of such slot bridge filter tubes, and there are no restrictions on the shape of the slot bridges or tubes subject.

It is known to manufacture such slot bridge filter tubes so that the slot bridges are pressed into sheet metal, for example by means of Eccentric presses can be done. The panels are then rolled into tubes, which be welded. This known manufacturing method has the disadvantage that When the pipes are rolled, deformations of the slotted bridges that have already been pressed are possible are, which may even lead to a closure of the pipe openings produced can.

The invention is based on the object of a method of the specified Kind to make available that in a simple and economical way the production made possible by particularly precisely shaped slot bridge filter tubes.

According to the invention, this object is achieved by a method having the characterizing features Features of claim 1 solved.

The method according to the invention is thus based on the known teaching deviated from the embossing of the slotted bridges in sheet metal, and the slotted bridges become embossed in the tube itself. This is achieved via cutting tools that are used by the Inside the pipe are pressed radially outward against the pipe wall and thereby corresponding Shear off areas of the pipe wall and offset radially outwards. These areas are moved into corresponding cavities by matrices, which are opposed from the outside the pipe wall can be moved. By arranging and fixing one to the inside of the pipe adapted support body inside the pipe and the arrangement and fixation of the matrices on the outside of the pipe it is ensured that the rest of the pipe wall during manufacture the slot bridges experience no deformation. The support body and the practice The matrices do not exert any pressure on the pipe wall, but may be in contact with play the pipe wall. The matrices cover such a stretch of the pipe circumference, that the slot bridges can be removed without deformation by a perfect shearing process the adjacent pipe wall areas shear off these and radially outwards move into the die cavities.

After shearing off the corresponding pipe wall areas and manufacturing of the desired slot bridges, the dies and the cutting tools become radial moved back. The tube can now be moved axially forward, after which another Set of slotted bridges can be made.

The process can thus be carried out continuously over almost any Perform pipe lengths.

Depending on the number of slot bridges desired over the pipe circumference can with one or more dies and with one or more cutting tools to be worked. In the case of normal pipe diameters, these are seen in the circumferential direction made about six slotted bridges with six dies and six cutting tools. It should be understood that the invention is not limited to this number.

The shape of the slot bridges plays a role in the implementation of the invention Procedure does not matter. All that is required for this is the dies and cutting tools train in a corresponding manner. For example, the matrices can also be provided with several cavities arranged next to one another in the circumferential direction, are introduced into the corresponding tool parts. This allows several, slotted bridges arranged adjacent in the circumferential direction with a single die and a single tool.

The fact that in the method according to the invention the slot bridges are first impressed in the pipe, there is no further work process on the with the slotted bridge provided pipe instead, so that there is no risk of subsequent Deformation of the slot bridges is given. The process can be done in simpler and realize it economically. Any number of Slot bridges in Imprint tubes, taking advantage of continuous Working method are achievable. Depending on the arrangement and design of the cutting tools Slotted bridges offset in the axial direction can also be used in one embossing process produce.

The invention also relates to a device for performing the procedure described above.

According to the invention, this device is characterized by the features of the patent claim 6 marked.

In the device according to the invention, this is done with the slotted bridges to be provided tube pushed over the hollow cylindrical support body, so that the Inner surface of the pipe rests against the outer surface of the support body or at a small distance is arranged to this. The support body also serves as a cutting tool guide body and has at least one radial slot in which the holder of a cutting tool or in the case of a one-piece design, the cutting tool itself can be moved back and forth radially is stored. To move the tool holders radially outwards and inwards or to enable tools, these are on their inner surface in the axial direction formed inclined and stand with the outer surface of one in the cavity of the support body axially displaceably arranged cone in engagement, with an axial movement of the cone the axially front and rear ends are thus guided in the forward direction Tools or tool holder moved radially outward, with the tools the respective Press the slot bridges out of the pipe wall. The cone preferably has a inclined at a ratio of 1:10 Outer surface, so that at a Feeding the cone by 10 mm results in a slot depth of 1 mm. this is a very precise control with regard to the formation of the slot bridges possible.

The device designed according to the invention further comprises at least a radially movable die, the inner surface of which is fitted to the outer surface of the pipe and has a cavity suitable for receiving the slot bridge. These Die is driven against the outer surface of the pipe on the support body, so that it rests against the outer surface of the pipe, but does not exert any pressure on it. The die is arranged so that it is opposite the cutting tool. When the cutting tool is extended, it forms the corresponding abutment for the pipe wall, so that corresponding pipe wall areas sheared off and into the The cavity of the die can be moved into it. The die is in the circumferential direction and designed to be larger in the axial direction than the associated cutting tool, so that the pipe wall can be supported in one another.

The cone is preferably made with the help of an adjusting cylinder, which is hydraulic or can be operated pneumatically, axially moved back and forth. To at the Backward movement of the cone means a radial inward movement of the tools or tool holders to achieve, these stand over in a special embodiment of the invention a forced guidance in Cleite intervention with the outer surface of the cone. For this purpose, the cone expediently has a dovetail shape on its outer surface Grooves into which the dovetail-shaped end of each tool holder is inserted slidingly. If now the cone by actuating the actuating cylinder is retracted axially, it slides relative to the tools fixed in the axial direction, whereby the tools are radial due to the dovetailed positive guidance be moved inward. The cone is moved back until the tools are again completely taken up by the support body.

The invention is illustrated below using an exemplary embodiment in Connection with the drawing explained in detail. They show: FIG. 1 a cross section by a device designed according to the invention along the line I-I in FIG 2; and FIG. 2 shows a longitudinal section through the device shown in FIG.

The device 1 shown in cross section in FIG upper half of the figure shown in a state in which the cutting tools are in the retracted state while they are in the lower half of the figure is shown in a state in which the cutting tools cut the respective pipe wall regions for the formation of slot have sheared off bridges.

FIG. 2 shows the device in the two in a corresponding manner Operating positions shown in Figure 1.

As can be seen from Figures 1 and 2, the device comprises 1 a support body 3, over which the pipes 2 to be provided with slotted bridges can be pushed are or which can be pushed into such tubes. The support body 3 is hollow cylindrical formed and has an enlarged region 15, the outer diameter of which is slightly smaller than the inner diameter of the with the Schlitzbrjjcken Pipe to be provided. However, the support body is so designed that it can be seen from the inside does not exert any pressure on the Kohrwandung.

A push rod 14 is located in the interior of the support body 3 the front end of which a cone 5 is formed, while the rear end of the Schubstangc 14 is in communication with a suitable actuating cylinder (not shown), by means of which the push rod can be moved back and forth in the axial direction. With one movement the push rod 14 becomes the cone 5 in the radially widened area 15 of the support body 3 axially reciprocated. Figure 2 shows the cone in its respective axial End positions, the axially front end position in the upper half and the axially rear end position are shown in the lower half of the figure.

As can be seen from Figure 1, the support body 3 in the radially expanded area 15 six radial slots 16 over the circumference of the support body are arranged distributed at regular intervals.

Cutting tools 4 are radially movable in these radial slots 16 stored. These cutting units # euge 4 are used to produce the slotted bridges Expressing and shearing off the respective pipe wall areas.

The cutting tools formed in one piece in the present case 4 are dovetail-shaped at their end facing the support body at 6, this end in a corresponding dovetail-shaped longitudinal groove 7 of the Support body is mounted. Support body and tool can thus in the axial direction slide relative to each other; with an axial forward movement of the support body however, the tools become radially outward and with an axial backward movement it is reinforced radially by only one.

The device 1 also has six evenly around the circumference of the support body distributed matrices 10, which can be moved in the radial direction are arranged. These matrices have a surface adapted to the pipe surface 11 on. If there is a pipe to be provided with slotted bridges over the support body 3 is located, the dies 10 are moved from the outside of the pipe until their Surface 11 comes into contact with the pipe surface or with little play in relation to it is arranged. In this position, the die supports the pipe wall when through the cutting tool moving radially outwards onto this from the inside a pressure is exerted so that a corresponding shearing process can take place. To accommodate the sheared-off pipe wall areas, the die is provided with the appropriate Ijohlanken 12 provided, which are adapted to the protruding tool areas S. In the embodiment described here, with a single tool 4 two slot bridges lying next to one another in the circumferential direction. For this is the tool with two protruding sections 8 and one recessed Section'9 provided, while the associated die has two longitudinal grooves 12 and one has protruding section 13. In the lower part of Figure 1 are the tools in the extended position, in which it shears off the corresponding pipe wall areas i have figured.

As can be seen from FIG. 2, each tool has 2 x 3 tools in a row arranged protruding portions 8. The protruding portions 8 of the two tubes can either be axially aligned with one another and axially offset from one another be, with the latter embodiment tubes with staggered slit bridges can be produced.

The device described above functions in the following Way: A pipe to be provided with slotted bridges is the result 2 pushed onto the support body 3. The cone 5 is here in its position shown in the lower part of Figure 2, in which the work testifies its radial take the innermost position. This position corresponds to the upper part of FIG. 1.

Next, the dies 10 are moved from the outside to the pipe wall, until they reach their respective end positions. You will be in these positions fixed so that they can act as reaction elements. By applying the Adjusting cylinder, the push rod 14 is now moved axially in the forward direction, whereby the tools over the cone 5 radially outwards against the Rohrwandtlng are pressed and, at a corresponding pressure, corresponding pipe wall areas shear off and press outwards into the corresponding cavities in the dies. These Pipe wall areas have been sheared off laterally, but are sloping over End webs still connected to the pipe.

In the embodiment described in full, the cone 5 is seated and the inner surfaces of the cutting tools have a slope of 1:10 so that at one Axial movement of the cone by 10 mm reaches a depth of the slot bridges of 1 mm will. This allows the depth of the slot bridges to be precisely controlled.

After completion of the pressing process, the cone 5 is axially into the in the lower half of Figure 2 shown position moved back axially, with as a result the Restraint guides the cutting tools are moved radially inward. The matrices are deducted from the outer surface of the pipe. It is thus a matter of the scope of the pipe extending around a series of slot bridges.

To produce the next row of slotted bridges, the pipe becomes a corresponding distance moved forward, after which the same processes as just carried out will.

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Claims (12)

Claims: 1. Process for the production of slot bridge filter tubes, in which the slotted bridges are pressed in using tools, g e k e n n -z e i h n e t d u r c h the following steps: a) Arranging and fixing at least one adapted to the outside of the pipe and one to accommodate the slot bridge specific cavity-provided die on the outside of a tube; b) Arrange and fixing a support body adapted to the inside of the pipe inside the pipe; c) Radial pressing of at least one cutting tool arranged inside the pipe out against the tube wall and into the die cavity; and d) move back of the cutting tool and the die in their starting positions. 2. The method according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that with a multitude of arranged around the pipe circumference Matrices is being worked on. 3. The method according to claim 2, d a d u r c h g e -k e n n z e i c h n e t that a plurality of cutting tools are pressed radially outward, wherein a cutting tool is assigned to each die. 4. The method of claim 3, d a d u r c h g e -k e n n z e i c h n e t that axially offset slot bridges are produced with adjacent cutting tools will. 5. The method according to any one of the preceding claims, d a d u r c h it is not noted that after moving back the cutting tools and Die is moved axially forward to create the next row of slotted bridges will. 6. Device for performing the method according to one of the preceding Claims that they have a hollow cylindrical Has support body (3), the outer diameter of which is slightly smaller than the inner diameter of the pipe (2) that the support body (3) has at least one radial slot (16) in which the holder of a cutting tool (4) is radially reciprocable that in the cavity an axially reciprocating cone (5) is arranged on the support body (3), its outer surface in sliding contact with the corresponding inclined formed inner surface of the tool holder is, and that they have at least one having radially displaceable die (10), the inner surface of which adjoins the outer surface of the pipe is adapted and a cavity (12) suitable for receiving the slot bridge having. 7. Apparatus according to claim 6, d a d u r c h g e -k e n n z e i c h n e t that the cone (5) has a positive guide with the inner surface of the tool holder is in Cleitkontakt, such that with a backward axial movement of the cone (5) the tool holder is moved radially inwards. 8. The device according to claim 7, d a d u r c h g e -k e n n z e i c h n e t that the cone (5) is dovetail-shaped on its outer surface i # t (7) into which the dovetail-shaped end (6) of the tool holder is inserted slidingly. 9. Device according to one of claims 7 or 8, d a d u r c h S It is not noted that the tool holder and tool (4) are integrally formed are. 10. Device according to one of claims 6 to 9, d a d u r c h g I do not know that they have an adjusting cylinder for the feed and return pull of the cone (5) arranged in the support body (3). 11. Device according to one of claims 6 to 10, d a d u r c h g e k e n n n z e i c h n c t that they have a multitude of around the circumference of the support body (3) spreading dies (10) and cutting tools (4). 12. The apparatus of claim 11, d a d u r c g e k e n n z e i c h n e t that adjacent cutting tools are offset from one another in the axial direction are arranged.