Tool for corrugating metal pipe

Abstract

The present application relates to a kind of metal pipe fittings corrugation tooling, including female die, mandrel;Female die is fixed on the clamp block of equipment, and the movable block of equipment is provided with an installation hole for installing mandrel, and the half of the center horizontal plane of neck portion of mandrel spinning is provided with reinforcing rib with length c.The present application effectively prevents the bending and fracture of mandrel when corrugating metal pipe with smaller inner diameter, prolongs the service life and increases the use frequency;When the inner diameter of pipe is close to the critical fracture size of original mandrel, the corrugation requirements are realized, the current welding ring welding process is replaced by corrugation process, and the manufacturing cost is reduced;The corrugation of pipe by spinning forming method has stable product quality, unchanged pipe length after corrugation, short clamping length, and can basically meet the corrugation requirements of complex-shaped pipe after bending forming, so it is widely used.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically relating to a tooling for corrugating metal pipe fittings. Background Technology

[0002] Spin forming is a common method for producing corrugated metal pipes. The tooling used includes a female mold and a mandrel. The appropriate female mold and mandrel are selected based on the outer diameter and wall thickness of the pipe. The mandrel is mounted on the movable block of the equipment. By manually adjusting the position of the movable block, contact and pressure are applied to the inner wall of the pipe. When the power is turned on, the female mold 1 automatically clamps the pipe, and the mandrel 2 shapes the pipe by rotating and applying pressure.

[0003] Both ΦA and ΦB of the mandrel are related to the inner diameter of the pipe fitting. When corrugating pipes with smaller inner diameters, the small size of the mandrel ΦA results in poor rigidity and low strength. Under the reaction force of the pipe fitting, the mandrel may bend, break, or have a short service life. This is especially true when the inner diameter of the pipe fitting is close to the critical fracture size of the mandrel; in such cases, this technology cannot be used to corrugate the pipe fitting. For a long time, the usual methods have been to change the mandrel material or perform heat treatment, but neither has been successful. Summary of the Invention

[0004] This invention provides a tooling for corrugating metal pipe fittings. The technical problem to be solved is: to improve its strength so that when corrugating metal pipes with smaller inner diameters, it can effectively prevent the mandrel from bending and breaking, thus extending the service life and increasing the frequency of use; when the inner diameter of the pipe fitting is small enough to approach the critical fracture size of the original mandrel, the corrugating requirements can be met and the frequency of use can meet the user's requirements.

[0005] To solve the above technical problems, the present invention provides a tooling for corrugating metal pipe fittings, including a female mold 1 and a mandrel 2; characterized in that: the female mold 1 is fixed on the clamping block of the equipment, the movable block of the equipment is provided with a mounting hole for mounting the mandrel, and the middle half of the horizontal surface of the neck of the mandrel is provided with a reinforcing rib of length c.

[0006] The reinforcing rib with length c refers to the length from the rear end of the spun rib to the step surface of the mandrel.

[0007] Beneficial effects: This invention effectively prevents the mandrel from bending and breaking when corrugating metal pipes with small inner diameters, extending service life and increasing usage frequency; when the inner diameter of the pipe is close to the critical fracture size of the original mandrel, the corrugating requirements are met, replacing the current process of using welded rings to make corrugations, thus reducing manufacturing costs; the method of making corrugated pipes by spinning has stable product quality, unchanged pipe length after corrugation, and short clamping length, which can basically meet the corrugating requirements of pipes with complex shapes after bending and forming, and therefore has been widely used. Attached Figure Description

[0008] Figure 1 Existing mandrel structure diagram

[0009] Figure 2 Schematic diagram of the structure of this invention;

[0010] Figure 3 Schematic diagram of the female mold structure;

[0011] Figure 4 Mandrel structure diagram

[0012] Figure 5 Schematic diagram of reinforcing ribs. Detailed Implementation

[0013] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below.

[0014] This invention proposes a tooling for corrugating metal pipe fittings, comprising a female mold 1 and a mandrel 2; as shown in the figure. Figure 2 As shown: The female mold 1 is fixed to the clamping block of the equipment. An additional mounting hole is added to the movable block of the equipment. A fastening plane is added to the mounting part of the mandrel 2. The mandrel 2 is fastened to the movable block by bolts 3. A reinforcing rib with a length of c and a shaded section is added to the neck of the mandrel spinning process, giving the mandrel spinning part a directionality. During the mandrel's pressure forming of the pipe fitting, the reaction force generated by the pipe on the mandrel is greatly enhanced by the added reinforcing rib, which significantly strengthens the mandrel neck. This effectively prevents the mandrel from bending and breaking when corrugating pipes with smaller inner diameters, extending its service life and increasing its usage frequency. When the inner diameter of the pipe fitting is small enough to approach the original mandrel's critical fracture size, the corrugation requirement is met.

[0015] This invention adds a fastening plane to the mandrel mounting area. Reinforcing ribs are added to the neck of the mandrel during spinning, effectively preventing bending and breakage of the mandrel when corrugating smaller inner diameter tubes, extending its service life and increasing its frequency of use. When the inner diameter of the tube is close to the original mandrel's critical fracture size, corrugation requirements are met. This effectively prevents bending and breakage of the mandrel when corrugating smaller inner diameter metal tubes, extending its service life and increasing its frequency of use. When the inner diameter of the tube is close to the original mandrel's critical fracture size, corrugation requirements are met, replacing the current process of using welded rings for corrugation, thus reducing manufacturing costs. Using spinning to corrugate tubes offers stable product quality, maintains the same tube length after corrugation, and has a short clamping length, basically meeting the corrugation requirements for tubes with complex shapes after bending, and therefore has been widely used.

[0016] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A tooling for corrugating metal pipe fittings, comprising a female mold and a mandrel; characterized in that: The female mold is fixed on the clamping block of the equipment. The movable block of the equipment has a mounting hole for mounting the mandrel. The middle half of the horizontal surface of the neck of the mandrel is provided with a reinforcing rib of length c. The mandrel is fastened to the movable block by bolts. The mounting part of the mandrel and the movable block is provided with a fastening plane for cooperating with the bolts. The reinforcing rib of length c refers to the length from the rear end of the spun rib to the step surface of the mandrel.

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