Anti-warping cutting tool for krah pipe inserting opening

Abstract

The utility model relates to the technical field of pipe processing, in particular to an anti-warping cutting tool for a Krah pipe socket, which comprises a tool handle and a tool body which are integrally formed, a through shaft is arranged in the middle of the tool body, a plurality of cutting edges arranged along the axial direction are rigidly fixed on the tool body, each cutting edge has two sections of different gradients, and the through shaft is arranged in the through shaft. The first cutting edge is used for normal cutting, the second cutting edge is used for preventing opening warping, and the inclination of the second cutting edge is larger than that of the first cutting edge. According to the cutting tool, two different gradients are arranged on the cutting edge of the tool body, and the gradient of the second cutting edge is slightly larger than that of the first cutting edge, so that the beneficial effects that the end part is directly cut at one time when a Krah pipe inserting opening is cut, and the subsequent warping opening does not need to be additionally processed, reworked and polished are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe processing, in particular to a cutting tool for preventing the socket of a corrugated pipe from warping. Background Technique

[0002] Traditional electrofusion-connected corrugated pipes are divided into sockets and spigots. When the pipes are connected to each other, they are connected by inserting the socket with a certain slope and copper wires into the spigot made by turning processing, and then electrified and melted together to form an electrofusion connection.

[0003] Due to the high precision of pipe socket and spigot insertion, strict requirements are imposed on the stability and dimensions of the socket and spigot. At present, however, the phenomenon of spigot warping occurs during the storage of pipes and during construction and installation, making it difficult or even impossible to install the pipes. The main reasons for this warping phenomenon are as follows:

[0004] ① Improper processing technology: When producing pipes, the socket and spigot of the corrugated pipe are surface-cooled and cut by atomized spraying. The cutting amount of the spigot is larger. If the pipe is not sufficiently cooled, it will not be able to be shaped immediately when cutting the spigot, thus affecting the dimensional stability of the spigot;

[0005] ② Specific characteristics of PE material: The non-uniformity during the extrusion molding of the PE material causes stress concentration at the port, resulting in warping;

[0006] ③ Spigot structure: The spigot has a certain slope but a non-uniform thickness structure, with insufficient strength and stability of the spigot;

[0007] ④ Temperature influence: Under the conditions of storage, transportation and the climate at the construction site, exposure to the sun, rain, too high or too low temperature will cause the plastic to expand and contract thermally, resulting in port deformation and warping.

[0008] Combined with the above situations, in the products of electrofusion connection of corrugated pipes, when the spigot warping occurs, only the socket and spigot of the pipe can be ground and reworked by personnel, wasting manpower and increasing construction costs. Content of the Utility Model

[0009] To solve the problems in the above background technique, the utility model provides a cutting tool for preventing the socket of a corrugated pipe from warping, which can directly solve the problem of pipe end warping by means of one-time cutting of the socket of the corrugated pipe, without the need for grinding and rework.

[0010] To achieve the above object, the technical solution provided by the utility model is as follows:

[0011] A cutting tool for preventing warping of the socket of a corrugated pipe, comprising a handle and a blade integrally formed. A through-axis is provided in the middle of the blade along the axial direction, and a plurality of cutting edges arranged axially are rigidly fixed on the blade. The cutting edge has a first cutting edge for normal cutting and a second cutting edge for preventing warping. The slope of the second cutting edge is greater than that of the first cutting edge.

[0012] In this article, the slope refers to the degree of inclination of the angle between the cutting edge and the virtual extension line of the rotation axis with the rotation axis of the blade as the horizontal baseline.

[0013] Compared with the prior art, the utility model sets two different slopes on the cutting edge of the blade, and makes the slope of the second cutting edge slightly greater than that of the first cutting edge, so as to achieve the technical effect that when cutting the socket of the corrugated pipe, the end can be directly cut at one time, and subsequent warping does not require additional processing and rework grinding.

[0014] Preferably, a chamfering part is provided between the second cutting edge and the handle. The chamfering part is integrally formed with the cutting edge, and the slope of the chamfering part is greater than that of the second cutting edge. During cutting, chamfering is required at the port to make the port more convenient for insertion. Setting the connection between the handle and the second cutting edge as a chamfering part with a larger slope can solve the chamfering problem during cutting.

[0015] Preferably, the length of the second cutting edge is less than half of the total length of the cutting edge. Based on the above scheme, the influence on the non-warping part of the socket can be reduced. Experiments have proved that the warping position is approximately in the second half of the port of the corrugated pipe.

[0016] Specifically, the length of the second cutting edge accounts for 2 / 5 - 1 / 2 of the total length of the cutting edge. Through multiple experiments, it has been proved that the total length of the socket welding contact section is 150 mm, and the warping deformation range from the end is between 70 - 74 mm.

[0017] Furthermore, the increase in the slope of the second cutting edge compared to the first cutting edge is proportional to the additional radius expansion caused by warping. Generally, warping will bring an additional 2 - 3 mm of diameter expansion to the port. According to calculations, the slope of the second cutting edge generally increases by 3.1° compared to the first cutting edge.

[0018] Furthermore, there are eight cutting edges evenly distributed on the blade, and the cutting directions are the same.

[0019] Furthermore, the end of the through-axis is gradually reduced in diameter to form a multi-stage counterbore, and a through groove is provided on the innermost through-axis. In order to further enhance the stability of the cutting tool after assembly, a multi-stage stepped counterbore is provided, and a through groove is provided to make the cutting tool inserted and fixed with the power shaft.

[0020] Furthermore, the cutting edge is fixedly connected to the blade by welding.

[0021] Further, the materials of the tool shank and the tool body are 45# steel, and the material of the cutting edge is alloy steel.

[0022] Further, the slope of the chamfering part is greater than twice the slope of the second cutting edge.

[0023] The beneficial effects of the present utility model are as follows:

[0024] 1. By providing a second cutting edge with a greater slope at a specific length of the tool body, the cutting of the port of the corrugated pipe can be completed at one time to solve the problem of warping, and subsequent rework and grinding are not required;

[0025] 2. Only by replacing the conventional socket cutting tool at the same position with an anti-end warping socket cutting tool, the installation is convenient and fast, and the original process method remains unchanged, with strong adaptability;

[0026] 3. Since only the second slope is set while the first slope remains unchanged, the installation dimensions of the original socket and spigot welding position are ensured, the welding effect is not affected, and the installation is more convenient;

[0027] 4. It avoids the cost of rework caused by the influence of material nature, processing technology, environmental temperature, etc. on the warping of the socket and dimensional changes, and avoids the construction cost caused by difficult installation or inability to install at the construction site. Description of the Drawings

[0028] Figure 1 is a schematic diagram of the overall structure of the corrugated pipe in the embodiment of the present utility model;

[0029] Figure 2 is the present utility model Figure 1 is a partial enlarged view of the port at A;

[0030] Figure 3 is a schematic diagram of the overall structure of the cutting tool in the embodiment of the present utility model;

[0031] Figure 4 is a side view of the cutting tool in the embodiment of the present utility model.

[0032] Wherein, the reference numerals in the figure are: 1 - tool shank, 2 - tool body, 3 - cutting edge, 301 - first cutting edge, 302 - second cutting edge, 4 - chamfering part, 5 - through shaft, 501 - through groove, 502 - counterbore, A - port. Detailed Embodiments

[0033] The technical solutions in the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the present utility model. The components of the present utility model usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0034] Embodiment

[0035] As Figure 1-2 shown, traditional electrofusion-connected corrugated pipes are provided with sockets and spigots. When the pipes are connected to each other, socket and spigot connection is achieved through a socket with a certain slope and copper wires and a spigot made by turning processing. Figure 2 In the port schematic diagram of [], it can be clearly seen that the end of the spigot will warp. Through data testing and collection of the warped spigots of corrugated pipes in stock, the total length of the welding contact section of the spigot is 150 mm, the warping deformation range from the end is between 70 - 74 mm, and the outer diameter dimension change range of the warped opening is from the original conventional dimension to an increase of 2 - 3 mm in the outer diameter after warping.

[0036] Please refer to Figure 3 the overall structure diagram of the cutting tool. To solve the warping of the corrugated pipe spigot, the present utility model proposes a corrugated pipe spigot anti-warping cutting tool, which includes a tool handle 1 and a tool body 2. The tool handle 1 and the tool body 2 are integrally formed, and the material is 45# steel. A through shaft 5 is provided in the middle of the tool body 2. The end of the through shaft 5 away from the installed power shaft is gradually reduced in diameter to form a multi-stage counterbore 502. A through groove 501 is provided on the innermost through shaft 5. This structure can make the cutting tool more stable when installed on the power shaft for cutting.

[0037] Furthermore, please combine with Figure 3-4 , cutting edges 3 are welded axially on the tool body 2. A total of 8 cutting edges 3 are evenly distributed on the tool body 2, and their cutting edges face the same direction. The cutting edges 3 are divided into two parts according to length, including a first cutting edge 301 for normal cutting and a second cutting edge 302 for anti-warping. The slope of the second cutting edge 302 is greater than that of the first cutting edge 301. The slope in this article refers to the degree of inclination of the included angle between the cutting edge 3 and the virtual extension line of the rotation axis with the rotation axis of the tool body 2 as the horizontal baseline.

[0038] Specifically, data testing and collection are carried out on the socket of the general warped socket of the corrugated pipe. The total length of the welding contact section of the socket is 150 mm. The warping deformation range from the end A is between 70 - 74 mm, and the outer diameter dimension change range of the warped socket is from the original conventional size to an increase of 2 - 3 mm in the outer diameter after warping. Thus, the length of the second cutting edge 302 accounts for 2 / 5 - 1 / 2 of the total length of the cutting edge 3; the increase in the slope of the second cutting edge 302 compared to the first cutting edge 301 is determined by calculating the additional radius expansion amount brought by the warped socket, and the two data show a proportional relationship. Generally, the warped socket will bring an additional 2 - 3 mm of diameter expansion to the port. According to the calculation, the slope of the second cutting edge 302 is generally increased by 3.1° compared to the first cutting edge 301. Specifically, in this embodiment, the slope α of the first cutting edge 301 is 2.36°, and the slope β of the second cutting edge 302 is 5.46°, and the material of the cutting edge 3 is alloy steel.

[0039] On the other hand, at the connection between the tool handle 1 and the cutting edge 3 of the cutting tool of the present invention is a chamfering portion 4. The chamfering portion 4 and the cutting edge 3 are integrally formed and welded and fixed on the tool body 2. Its slope is greater than twice the slope of the second cutting edge 302, and it can complete the chamfering cutting when directly cutting and removing the warped socket of the socket, further saving the cutting steps and costs and improving the cutting efficiency.

[0040] By setting two cutting edges with different slopes on the cutting edge 3 of the tool body of the present invention, and making the slope of the second cutting edge 302 slightly greater than that of the first cutting edge 301, the technical effect that the end can be directly cut in one go during the cutting of the socket of the corrugated pipe, and no additional processing and re - grinding of the subsequent warped socket is required is achieved. Just replace the conventional socket cutting tool at the same position with the anti - end - warping socket cutting tool, which is convenient and fast to install, and ensures that the original process method remains unchanged, with strong adaptability;

[0041] Since only the second slope is set and the first slope remains unchanged, the installation dimensions of the original socket - spigot fusion position are ensured, the fusion effect is not affected, and the installation is more convenient;

[0042] It avoids the cost of rework for personnel due to the warping of the socket, size changes caused by the nature of the material, processing technology, environmental temperature, etc., and avoids the construction cost caused by difficult installation or inability to install at the construction site.

[0043] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved. In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A carat tube socket anti-warping cutting tool, comprising an integrally formed handle (1) and a blade (2), characterized in that: The blade body (2) is provided with a through shaft (5) in the middle along the axial direction, and at least one cutting edge (3) arranged along the axial direction is rigidly fixed on the blade body (2), wherein the cutting edge (3) comprises a first cutting edge (301) for normal cutting and a second cutting edge (302) for preventing warping, wherein the slope of the second cutting edge (302) is greater than that of the first cutting edge (301).

2. The anti-warping cutting tool for carat tube socket according to claim 1, characterized in that: A chamfered portion (4) is provided between the second blade (302) and the blade handle (1); the chamfered portion (4) is integrally formed with the cutting edge (3), and its slope is greater than that of the second blade (302).

3. The anti-warping cutting tool for carat tube socket according to claim 1, characterized in that: The length of the second cutting edge (302) is less than half of the total length of the cutting edge (3).

4. The anti-warping cutting tool for carat tube socket according to claim 1, characterized in that: The length of the second blade (302) accounts for 2 / 5 to 1 / 2 of the total length of the cutting blade (3).

5. The anti-warping cutting tool for carat tube socket according to claim 1, characterized in that: The increase in the slope of the second blade (302) compared to the first blade (301) is proportional to the additional radius expansion caused by the warping.

6. The anti-warping cutting tool for carat tube socket according to claim 1, characterized in that: The cutting edges (3) are evenly distributed in eight strips on the blade body (2), and the cutting edges have the same direction.

7. The anti-warping cutting tool for carat tube socket according to claim 1, characterized in that: The end of the through shaft (5) is gradually reduced in diameter to form a multi-stage countersunk hole (502), wherein a through groove (501) is provided on the innermost through shaft (5).

8. The anti-warping cutting tool for carat tube socket according to claim 1, characterized in that: The cutting edge (3) is fixedly connected to the blade body (2) by welding.

9. The anti-warping cutting tool for carat tube socket according to claim 1, characterized in that: The material of the knife handle (1) and the knife body (2) is 45# steel, and the material of the cutting edge (3) is alloy steel.

10. The anti-warping cutting tool for the carat tube socket according to claim 2, characterized in that: The slope of the chamfered portion (4) is greater than twice the slope of the second blade (302).

Images