Corrugated pipe cutting clamp

Abstract

The invention discloses a corrugated pipe cutting clamp. The corrugated pipe cutting clamp comprises a mandrel and a jacking sleeve which are connected with a machine tool. The mandrel is of a stepped shaft structure, the shaft section, away from the machine tool, of the mandrel is slidably sleeved with a right conical supporting ring and a left conical supporting ring, the right conical supporting ring and the left conical supporting ring are oppositely arranged on the mandrel in the axial direction, the right conical supporting ring abuts against the abutting sleeve, and conical surfaces are arranged on the peripheries of the right conical supporting ring and the left conical supporting ring. The outer conical surfaces of the right side conical support ring and the left side conical support ring are jointly sleeved with an elastic chuck, opening grooves are formed in the left end and the right end of the elastic chuck, and when the elastic chuck is extruded, radial elastic expansion can be generated; the corrugated pipe cutting clamp is simple in structure and convenient to operate, reliable clamping can be achieved from the interior of a corrugated pipe, and the cutting precision and the machining efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of corrugated pipe processing equipment technology, and specifically to an internal support type cutting fixture for corrugated pipe cutting process. Background Technology

[0002] Currently, corrugated pipe cutting commonly employs external clamping methods for workpiece positioning and clamping, such as three-jaw chucks, externally expanding chucks, or simple external clamping fixtures. These external clamping structures have the following main problems: (1) Insufficient clamping stability: The outer surface of the corrugated pipe has a corrugated structure and is mostly thin-walled. Conventional external clamps can often only clamp at the local crest position, with a small force area, which makes it easy to slip or shift, resulting in unstable cutting position. (2) Uneven distribution of clamping force: In order to prevent slippage, it is necessary to increase the external clamping force, but excessive local radial pressure will damage the corrugated structure, causing corrugation deformation or even failure, affecting the sealing performance and pressure bearing performance of the corrugated pipe. (3) Prone to cutting deformation and cut defects: Due to the clamping method, the corrugated pipe is prone to elliptical deformation or axis deviation during the cutting process, making it difficult to guarantee the flatness and perpendicularity of the cut, which is not conducive to subsequent welding and assembly.

[0003] Therefore, there is an urgent need to provide a corrugated pipe cutting fixture that can reliably support the pipe from inside, balance clamping force and protect the corrugated structure, and is suitable for batch cutting. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of existing corrugated pipe external clamping and cutting methods, such as unstable clamping, easy damage to the corrugations, and poor cut quality. It provides a corrugated pipe cutting fixture with simple structure, convenient operation, and reliable clamping from the inside of the corrugated pipe, so as to improve cutting accuracy and processing efficiency.

[0005] To achieve the above objectives, the present invention employs the following technical solutions: A bellows cutting fixture includes a mandrel and a clamping sleeve respectively connected to a machine tool. The left end of the mandrel has a Morse taper structure for engaging with the Morse taper hole of the machine tool spindle. The right end of the clamping sleeve is provided with a center hole for engaging with the center of the machine tool, so that the center of the machine tool can press against the clamping sleeve. The mandrel is configured as a stepped shaft structure. The shaft section of the mandrel away from the machine tool is slidably fitted with a right conical support ring and a left conical support ring, which are arranged opposite each other on the mandrel along the axial direction. The right conical support ring abuts against the clamping sleeve. The outer periphery of the right and left conical support rings is set as a conical surface. The outer conical surfaces of the right and left conical support rings are fitted with an elastic chuck. Both ends of the elastic chuck have opening slots. The opening slots at both ends extend from different circumferential positions of the elastic chuck towards the center, which cooperate with the connecting section of the non-slotted area of ​​the elastic chuck to generate radial elastic expansion when compressed.

[0006] As a preferred embodiment, a rubber pad is fixed to the outer wall of the elastic clamp.

[0007] As a preferred embodiment, the elastic chuck is further provided with an annular tool-avoiding groove in the middle.

[0008] As a preferred embodiment, the mandrel is further provided with a shaft end retaining ring.

[0009] As a preferred embodiment, both the right conical support ring and the left conical support ring are provided with flat keys between themselves and the mandrel.

[0010] As a preferred embodiment, the return spring is sleeved on the mandrel.

[0011] Compared with the prior art, the present invention has the following beneficial effects: (1) Improve cutting accuracy: High-precision coaxial positioning is achieved by the conical surface of the mandrel and the Morse taper hole of the machine tool spindle; the elastic chuck is radially expanded by the double conical surface driving, so that the corrugated pipe is supported and positioned from the inside, ensuring the stability of the pipe axis during the cutting process, and significantly improving the perpendicularity and flatness of the cut.

[0012] (2) Effective protection of the corrugated pipe structure: The clamping force is transmitted to the inner wall of the corrugated pipe by the elastic clamp and the outer rubber pad. The clamping pressure distribution is more uniform, avoiding the damage such as flattening and tearing caused to the outer surface of the corrugated pipe by the traditional external clamping method. It is especially suitable for cutting thin-walled corrugated pipes and corrugated pipes of special materials.

[0013] (3) Strong adaptability and versatility: The elastic chuck can expand radially within a certain range under the action of axial driving force, and can be compatible with various specifications of bellows within a certain outer diameter tolerance range. There is no need to frequently replace the main body of the clamp. Different pipe diameters can be adapted simply by replacing or adjusting the elastic chuck and rubber pad, which reduces the cost of changing the type.

[0014] (4) Simple operation and high safety: The entire clamping and loosening process can be completed by the clamping and loosening action of the machine tool tip. No additional manual adjustment mechanism is required. Operators can complete the bellows clamping by following the conventional tailstock clamping steps. The clamping is reliable and prevents the workpiece from flying out or loosening during the cutting process.

[0015] (5) Facilitates batch processing and automated application: The fixture structure of this invention is compact, the clamping and resetting process is fast, and the repeatability is good. It is suitable for use with CNC lathes or automated production lines to meet the batch cutting process requirements of corrugated pipes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a corrugated pipe cutting fixture.

[0017] Figure 2 This is a partial cross-sectional view of a bellows cutting fixture.

[0018] Figure 3 This is an overall cross-sectional view of a bellows cutting fixture.

[0019] In the diagram: 1-Mandrel; 2-Tightening sleeve; 3-Right conical support ring; 4-Left conical support ring; 5-Elastic chuck; 51-Opening groove; 52-Annular tool avoidance groove; 6-Rubber pad; 7-Reset spring; 8-Flat key; 9-Shaft end retaining ring. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] Example 1: like Figure 1 and Figure 3 As shown, a bellows cutting fixture includes a mandrel 1 and a clamping sleeve 2, which are respectively connected to a machine tool. The left end of the mandrel 1 has a Morse taper structure for engaging with the Morse taper hole of the machine tool spindle. The right end of the clamping sleeve 2 is provided with a center hole for engaging with the center of the machine tool, so that the center of the machine tool can press against the clamping sleeve 2. The mandrel 1 is configured as a stepped shaft structure. The shaft section of the mandrel 1 away from the machine tool is slidably fitted with a right conical support ring 3 and a left conical support ring 4, which are arranged opposite each other on the mandrel 1 along the axial direction. The right conical support ring 3 abuts against the top sleeve 2. The outer periphery of the right conical support ring 3 and the left conical support ring 4 is set as a conical surface. The outer conical surfaces of the right conical support ring 3 and the left conical support ring 4 are fitted together with an elastic chuck 5. Both ends of the elastic chuck 5 are provided with opening slots 51. The opening slots 51 at both ends extend from different circumferential positions of the elastic chuck towards the center, which cooperate with the connecting section of the non-grooved area of ​​the circumferential region of the elastic chuck 5 to generate radial elastic expansion when the elastic chuck 5 is squeezed.

[0023] The clamping sleeve 2 is fitted onto the right end of the spindle 1, and its left end abuts against the right conical support ring 3. Its right end is provided with a center hole that mates with the machine tool center. When the machine tool center presses against the clamping sleeve 2, the clamping sleeve 2 drives the right conical support ring 3 to move to the left against the elastic force of the return spring 7. This causes the elastic chuck 5 to expand radially under the pressure of the outer conical surfaces of the right conical support ring 3 and the left conical support ring 4, and to tighten the inner circle of the bellows through the rubber pad 6. When the machine tool center is released, the right conical support ring 3 and the clamping sleeve 2 move in opposite directions under the action of the return spring 7, and the elastic chuck 5 retracts radially.

[0024] A rubber pad 6 is fixed to the outer wall of the elastic clamp 5, and the outer circle of the rubber pad 6 is used to fit against the inner circle of the bellows.

[0025] The elastic collet 5 also has an annular anti-cutting groove 52 in the middle to prevent the tool from accidentally cutting the elastic collet 5 and improve its service life.

[0026] The mandrel 1 is also provided with a shaft end retaining ring 9, which is installed at the end of the small diameter section of the stepped shaft and together with the stepped shoulder of the mandrel 1 is used to limit the axial movement of the right tapered support ring 3 and the clamping sleeve 2 in the reset direction.

[0027] Both the right conical support ring 3 and the left conical support ring 4 are provided with flat keys 8 between themselves and the spindle 1 to restrict the circumferential rotation of the two support rings.

[0028] The return spring 7 is sleeved on the spindle 1 and arranged between the right conical support ring 3 and the left conical support ring 4, and is used to apply a spring force to the right conical support ring 3 and the left conical support ring 4 to make them move away from each other.

[0029] The specific steps for using the corrugated pipe cutting fixture of this invention are as follows: (1) Install the fixture: Insert the Morse taper end of the mandrel 1 into the Morse taper hole of the machine tool spindle and press it tightly to realize the positioning connection between the fixture of the present invention and the machine tool spindle.

[0030] (2) Fitting the corrugated pipe: Fit the corrugated pipe to be cut onto the outer circle of the elastic chuck 5 and the rubber pad 6 from the right side, adjust the axial position of the corrugated pipe so that the part to be cut is located in the annular cutter groove 52, and determine the cutting length according to the processing requirements.

[0031] (3) Tightening and clamping: Insert the tailstock center of the machine tool into the center hole of the tightening sleeve 2 and apply an axial tightening force to the left. The axial force is transmitted to the right conical support ring 3 through the tightening sleeve 2, causing the right conical support ring 3 to move to the left along the spindle 1 and compress the return spring 7. During this process, the outer conical surface of the right conical support ring 3 presses against the inner hole of the right end of the elastic chuck 5, causing the right end of the elastic chuck 5 to expand radially (the existence of the opening groove 51 allows for radial elastic expansion when compressed), thereby causing the rubber pad 6 to partially fit against the inner circle of the bellows; as the center continues to tighten, the elastic chuck 5 gradually moves to the left as a whole, and its left end inner hole contacts and is compressed against the outer conical surface of the left conical support ring 4. The left end of the elastic chuck 5 expands radially at the same time until the rubber pad 6 on the outer circle of the elastic chuck 5 is fully fitted against the inner circle of the bellows within the axial range, realizing the internal support and stable clamping of the bellows.

[0032] (4) Cutting process: After the bellows is reliably clamped, start the machine tool to drive the machine tool spindle to rotate, and the bellows rotates synchronously with the mandrel 1. The operator adjusts the cutting tool feed according to the process requirements to cut the bellows to obtain the required length and cut quality.

[0033] (5) Unclamping and resetting: After cutting, loosen the tailstock center of the machine tool. Under the elastic force of the reset spring 7, the clamping sleeve 2 moves to the right together with the right conical support ring 3 until the right conical support ring 3 is limited by the shaft end retaining ring. As the conical surface compression is released, the elastic chuck 5 returns from the radial expansion state to the original state under its own elastic action. The rubber pad 6 disengages from the inner circle of the bellows. At this time, the processed bellows can be removed from the fixture, and the fixture as a whole returns to the initial state, ready for clamping and cutting the next bellows.

[0034] As can be seen from the above embodiments, the bellows cutting fixture of the present invention can effectively protect the bellows structure while ensuring clamping reliability, and significantly improve the processing quality and production efficiency of the bellows cutting process. The double conical surface converts axial force into synchronous radial expansion at both ends, and the internal support clamping achieves large-area contact; the rubber pad disperses contact pressure to avoid damage to the thin-walled corrugations; the tool avoidance groove ensures the safety margin of the tool and improves the straightness and perpendicularity of the cut.

[0035] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A corrugated pipe cutting fixture, characterized in that: Includes a mandrel and a clamping sleeve, which are respectively connected to the machine tool; The mandrel is configured as a stepped shaft structure. The shaft section of the mandrel away from the machine tool is slidably fitted with a right conical support ring and a left conical support ring, which are arranged opposite each other on the mandrel along the axial direction. The right conical support ring abuts against the clamping sleeve. The outer periphery of the right and left conical support rings is set as a conical surface. The outer conical surfaces of the right and left conical support rings are fitted with an elastic chuck. Both ends of the elastic chuck have opening slots. The opening slots at both ends extend from different circumferential positions of the elastic chuck towards the center, which cooperate with the connecting section of the non-slotted area of ​​the elastic chuck to generate radial elastic expansion when compressed.

2. The corrugated pipe cutting fixture according to claim 1, characterized in that: A rubber pad is fixed to the outer wall of the elastic clamp.

3. The corrugated pipe cutting fixture according to claim 1, characterized in that: The elastic chuck also has an annular tool-avoiding groove in the middle.

4. The corrugated pipe cutting fixture according to claim 1, characterized in that: The mandrel is also provided with a shaft end retaining ring.

5. A corrugated pipe cutting fixture according to claim 1, characterized in that: Both the right-side tapered support ring and the left-side tapered support ring are provided with flat keys between themselves and the mandrel.

6. A corrugated pipe cutting fixture according to claim 1, characterized in that: The reset spring is sleeved on the mandrel and arranged between the right conical support and the left conical support.

Images