CN102886406B - Soft mandrel for forming conduit - Google Patents

The invention relates to a soft mandrel for forming a conduit, which is characterized by comprising a sleeve, an expanded sleeve, a tapered screw rod, a screw shell, a screw and a gasket, wherein the sleeve is sheathed outside the expanded sleeve; the tapper screw rod is arranged in the expanded sleeve; the screw passes through the gasket and is arranged at one end of the tapered screw rod; the screw shell is arranged at one end of the tapered screw rod in a threaded connection manner; an outer cone structure with conical degree is arranged at the other end of the tapered screw rod; and the outer cone has an taper angle of 6-10 degrees. The soft mandrel has the advantages that the working procedure of filling rosin and sand are omitted in the conduit manufacturing technology, so that the problems that a rosin filling device is backward, sand filling completely depends on manpower and is influenced by individual differences, the degree of tightness of sand filling is not stable, and the like can be solved; and the production efficiency is greatly improved, the cost is reduced, and the production period is shortened.

The soft plug of a kind of duct forming

Technical field

The present invention relates to the inner wall supporting device field of tube bending forming, particularly a kind of duct forming soft plug.

Background technology

Tube bending processing is the basic working procedure that conduit manufactures.Aero-engine upper conduit quantity is a lot, different, most conduit is curvature of space, adopt in CNC tube bending machine BENDING PROCESS, as easy as rolling off a logly occur that outer wall is thinning and even break, the phenomenons such as the thickening even wrinkling and cross section of inwall is oval, for avoiding occurring the problems referred to above, before bend pipe, the normal filler that loads is to improve interior support.

Because the domestic tubing of aviation only ensures catheter outer diameter and thickness of pipe wall size, not tight to guide pipe inner hole dimensional requirement, numerical-control bending plug does not mate with domestic tubing, can only fill with the traditional handicraft such as rosin, back-up sand by inner chamber, to meet Large Diameter Pipeline stainless steel pipe normal temperature numerical-control bending batch production requirements, but filling rosin equipment falls behind, back-up sand relies on manually completely, affect by individual differences, the tightness adding sand is unstable, thus affects guiding-tube bend quality.

Summary of the invention

The object of the invention is to improve aeroengine pipeline bending quality and efficiency, change and fill with the conventional tube such as rosin, back-up sand forming technology, spy provides the soft plug of a kind of duct forming.

The invention provides the soft plug of a kind of duct forming, it is characterized in that: the soft plug of described duct forming, comprises sleeve 1, expansion set 2, conical screw 3, swivel nut 4, screw 5, packing ring 6;

Wherein: sleeve 1 is enclosed within the outside of expansion set 2, it is inner that conical screw 3 is arranged on expansion set 2, screw 5 is arranged on one end of conical screw 3 through packing ring 6, swivel nut 4 is threaded connection the one end being arranged on conical screw 3, the other end of conical screw 3 is the Outer Taper structure with tapering, and Outer Taper cone angle is 6 ~ 10 °.

Sleeve 1 and catheter diameter matched in clearance, during free state, sleeve 1 diameter is less than catheter diameter actual size 0.2 ~ 0.3 millimeter, during work, turn swivel nut 4, drive conical screw 3 to move to the left, the inner conical surface that the Outer Taper part swelling expansion set 2 of conical screw 3 coordinates with it.

The material of described sleeve 1 is engineering plastics, is specially polyetheretherketonematerials materials part.

Described conical screw 3 is 45# steel materials and parts.

Described expansion set 2 end is with inner cone structure, and the angle a of interior wimble structure is between 6 ~ 10 °.

Duct forming is the inner wall supporting device for tube bending forming with soft plug, in guiding-tube bend process, for the inwall of supporting tube bending radius, prevents tubular distortion and subsides.Bearing tolerances is comparatively large, and for eliminating gap, plug adopts cone centering expanding structure, by the outer field plastic sleeve of motion swelling plug of cone screw rod, thus swelling catheter diameter, eliminate the radial clearance between plug and ips.

The material of sleeve 1 is engineering plastics, in plug swelling process, avoids tube wall to scratch; Expansion set 2 adopts T8A material, stage-hardening, and L1 section hardness is high, and L2 section hardness is low, and its left end screw thread is connected with sleeve 1, right-hand member d1 section part and sleeve 1 matched in clearance, and diameter is that the part of d section is slidably matched with conical screw 3, and h is of a size of 1.5 ~ 3 millimeters.

Advantage of the present invention:

The soft plug of duct forming of the present invention, eliminate filling rosin, the sand filling process in conduit manufacturing process, solve filling rosin equipment to fall behind, back-up sand relies on manually completely, affect by individual differences, the tightness instability of back-up sand waits unsafe factor, substantially increases production efficiency, reduce cost, shorten the production cycle.

Accompanying drawing explanation

Below in conjunction with drawings and the embodiments, the present invention is further detailed explanation:

Fig. 1 is the soft mandrel structure schematic diagram of duct forming;

Fig. 2 is expansion set structural representation.

Detailed description of the invention

Embodiment 1

Present embodiments provide the soft plug of a kind of duct forming, it is characterized in that: the soft plug of described duct forming, comprises sleeve 1, expansion set 2, conical screw 3, swivel nut 4, screw 5, packing ring 6;

Wherein: sleeve 1 is enclosed within the outside of expansion set 2, it is inner that conical screw 3 is arranged on expansion set 2, screw 5 is arranged on one end of conical screw 3 through packing ring 6, swivel nut 4 is threaded connection the one end being arranged on conical screw 3, the other end of conical screw 3 is the Outer Taper structure with tapering, and Outer Taper cone angle is 6 °.

Sleeve 1 and catheter diameter matched in clearance, during free state, sleeve 1 diameter is less than catheter diameter actual size 0.2 ~ 0.3 millimeter, during work, turn swivel nut 4, drive conical screw 3 to move to the left, the inner conical surface that the Outer Taper part swelling expansion set 2 of conical screw 3 coordinates with it.

The material of described sleeve 1 is engineering plastics, is specially polyetheretherketonematerials materials part.

Described conical screw 3 is 45# steel materials and parts.

Described expansion set 2 end is with inner cone structure, and the angle a of interior wimble structure is at 6 °.

Duct forming is the inner wall supporting device for tube bending forming with soft plug, in guiding-tube bend process, for the inwall of supporting tube bending radius, prevents tubular distortion and subsides.Bearing tolerances is comparatively large, and for eliminating gap, plug adopts cone centering expanding structure, by the outer field plastic sleeve of motion swelling plug of cone screw rod, thus swelling catheter diameter, eliminate the radial clearance between plug and ips.

The material of sleeve 1 is engineering plastics, in plug swelling process, avoids tube wall to scratch; Expansion set 2 adopts T8A material, stage-hardening, and L1 section hardness is high, and L2 section hardness is low, and its left end screw thread is connected with sleeve 1, right-hand member d1 section part and sleeve 1 matched in clearance, and diameter is that the part of d section is slidably matched with conical screw 3, and h is of a size of 1.5 millimeters.

Embodiment 2

Present embodiments provide the soft plug of a kind of duct forming, it is characterized in that: the soft plug of described duct forming, comprises sleeve 1, expansion set 2, conical screw 3, swivel nut 4, screw 5, packing ring 6;

Wherein: sleeve 1 is enclosed within the outside of expansion set 2, it is inner that conical screw 3 is arranged on expansion set 2, screw 5 is arranged on one end of conical screw 3 through packing ring 6, swivel nut 4 is threaded connection the one end being arranged on conical screw 3, the other end of conical screw 3 is the Outer Taper structure with tapering, and Outer Taper cone angle is 8 °.

Sleeve 1 and catheter diameter matched in clearance, during free state, sleeve 1 diameter is less than catheter diameter actual size 0.2 ~ 0.3 millimeter, during work, turn swivel nut 4, drive conical screw 3 to move to the left, the inner conical surface that the Outer Taper part swelling expansion set 2 of conical screw 3 coordinates with it.

The material of described sleeve 1 is engineering plastics, is specially polyetheretherketonematerials materials part.

Described conical screw 3 is 45# steel materials and parts.

Described expansion set 2 end is with inner cone structure, and the angle a of interior wimble structure is at 8 °.

Duct forming is the inner wall supporting device for tube bending forming with soft plug, in guiding-tube bend process, for the inwall of supporting tube bending radius, prevents tubular distortion and subsides.Bearing tolerances is comparatively large, and for eliminating gap, plug adopts cone centering expanding structure, by the outer field plastic sleeve of motion swelling plug of cone screw rod, thus swelling catheter diameter, eliminate the radial clearance between plug and ips.

The material of sleeve 1 is engineering plastics, in plug swelling process, avoids tube wall to scratch; Expansion set 2 adopts T8A material, stage-hardening, and L1 section hardness is high, and L2 section hardness is low, and its left end screw thread is connected with sleeve 1, right-hand member d1 section part and sleeve 1 matched in clearance, and diameter is that the part of d section is slidably matched with conical screw 3, and h is of a size of 2 millimeters.

Embodiment 3

Present embodiments provide the soft plug of a kind of duct forming, it is characterized in that: the soft plug of described duct forming, comprises sleeve 1, expansion set 2, conical screw 3, swivel nut 4, screw 5, packing ring 6;

Wherein: sleeve 1 is enclosed within the outside of expansion set 2, it is inner that conical screw 3 is arranged on expansion set 2, screw 5 is arranged on one end of conical screw 3 through packing ring 6, swivel nut 4 is threaded connection the one end being arranged on conical screw 3, the other end of conical screw 3 is the Outer Taper structure with tapering, and Outer Taper cone angle is 10 °.

Sleeve 1 and catheter diameter matched in clearance, during free state, sleeve 1 diameter is less than catheter diameter actual size 0.2 ~ 0.3 millimeter, during work, turn swivel nut 4, drive conical screw 3 to move to the left, the inner conical surface that the Outer Taper part swelling expansion set 2 of conical screw 3 coordinates with it.

The material of described sleeve 1 is engineering plastics, is specially polyetheretherketonematerials materials part.

Described conical screw 3 is 45# steel materials and parts.

Described expansion set 2 end is with inner cone structure, and the angle a of interior wimble structure is at 10 °.

Duct forming is the inner wall supporting device for tube bending forming with soft plug, in guiding-tube bend process, for the inwall of supporting tube bending radius, prevents tubular distortion and subsides.Bearing tolerances is comparatively large, and for eliminating gap, plug adopts cone centering expanding structure, by the outer field plastic sleeve of motion swelling plug of cone screw rod, thus swelling catheter diameter, eliminate the radial clearance between plug and ips.

The material of sleeve 1 is engineering plastics, in plug swelling process, avoids tube wall to scratch; Expansion set 2 adopts T8A material, stage-hardening, and L1 section hardness is high, and L2 section hardness is low, and its left end screw thread is connected with sleeve 1, right-hand member d1 section part and sleeve 1 matched in clearance, and diameter is that the part of d section is slidably matched with conical screw 3, and h is of a size of 3 millimeters.