CN203484523U - Pre-deformation die structure of pipe bending die - Google Patents

Abstract

The utility model provides a pre-deformation die structure of a pipe bending die and accordingly the technical problem that a pipe especially the bent position of a small radius of thin-walled part is unstable in deformation is solved. The pre-deformation process is added to the machining process through the change of a die cavity circular arc of a moving die and accordingly the pre-deformation of the pipe is produced to offset the bending deformation and accordingly the forming stability of the product can be ensured. According to the technical analysis and the fact, the change is effective, the production efficiency and the quality of the product are improved, and meanwhile the production cost of the product is reduced.

Description

A kind of predeformation mode structure of tube bending mould

Technical field

The utility model relates to the cold conditions bending machining of pipe, particularly relates to the predeformation bending and molding processing of minor radius thin-wall part.

Background technology

Every profession and trade need to be carried out the various shapes of cold conditions brake forming to pipe at present, to interconnect assembling between pipe and other equipment appurtenances.

There is many defects in existing design of bending die.Existing bending die is comprised of fixed die 1, movable mold 2 and guide plate 3, wherein the die cavity of the die cavity of fixed die 1 and movable mold 2 is two semicircles that curvature is identical, at tube bending, add man-hour, after causing Pipe forming, knee deflection is unstable, and bending part has obvious clamping seal, plug wearing and tearing comparatively fast.Product needed inside need to be used plug to fix laggard line bend, and the later stage need to guarantee the qualified of product size by check, and product quality and production cost are wayward.

Summary of the invention

The unsettled technical problem of bending part deflection when solving pipe cold conditions bending machining, this novel practical provides a kind of predeformation mode structure of tube bending mould, mould can apply certain pressure to pipe before crooked, make pipe carry out predeformation, above-mentioned metaboly be can not there is during bending again, quality and stability that product adds man-hour improved.

Described utility model predeformation mode structure, the die cavity circular arc of fixed die 1 is the semicircle that radius is identical with pipe to be processed, the change radius arc that the die cavity circular arc of movable mold 2 is comprised of two kinds of different circular arcs of curvature.

Effect of the present utility model is by new construction of the present utility model, to make to have added in processing process the process of predeformation, thereby first being produced, pipe when a predeformation amount has been offset bending, produces deflection, the unsettled technical problem of bending part deflection while making pipe cold conditions bending machining is resolved, and improved quality and stability that product adds man-hour.

Accompanying drawing explanation

Fig. 1: former tube bending mode structure schematic diagram.

Fig. 2: the predeformation mode structure schematic diagram of tube bending mould of the present utility model.

Fig. 3: the predeformation mode structure machining sketch chart of tube bending mould of the present utility model.

The specific embodiment

As shown in Figure 1, the die cavity circular arc curvature of the fixed die 1 of former tube bending mould and movable mold 2 is the same, and original structure is only by the circular location of die cavity, and during bending, pipe is stressed, and upper and lower metaboly can occur, and has affected the deflection of pipe bending part, unstable product quality.

As shown in Figure 2, R1 is the radius corresponding to die cavity circular arc of fixed die 1, R2 and R3 are that the die cavity of movable mold 2 becomes two radiuses corresponding to radius arc, H is the degree of depth (size is variable) of movable mold 2 die cavity circular arcs, l is the matched moulds distance (size is fixed as 0.5mm) of fixed die 1 and movable mold 2, R is the elbow radius of pipe to be processed, the diameter that d is pipe to be processed.Above parameter has following relation: when 1<R/d≤1.5, and R1=0.5d, R2=1d, R3=0.4d, H=0.6d; When 1.5<R/d<3.5, R1=0.5d, R2=0.98d, R3=0.35d, H=0.55d; When R/d >=3.5, R1=0.5d, R3=0.5d, H=0.5d.

As shown in Figure 3, during pipe processing, the die cavity of first pipe to be processed being put into fixed die 1 is rear fixing, then start process equipment, promoting movable mold 2 makes it and fixed die 1 laminating, make tube grip and predeformation, last under the boosting of guide plate 3, make fixed die 1 axial-rotation make pipe bending and molding.

The utility model predeformation mode structure is manufactured after acceptance(check), is fixed on special-purpose bending forming machine, after debugging and detecting, just can carry out the bending and molding processing work of pipe.

As shown in Figure 3, during pipe processing, the die cavity of first pipe to be processed being put into fixed die 1 is rear fixing, then start process equipment, promoting movable mold 2 makes it and fixed die 1 laminating, make tube grip and predeformation, last under the boosting of guide plate 3, make fixed die 1 axial-rotation make pipe bending and molding.

Claims (2)

1. the predeformation mode structure of a tube bending mould, comprise fixed die (1), movable mold (2) and guide plate (3), it is characterized in that: the die cavity circular arc of fixed die (1) is the semicircle that radius is identical with pipe to be processed, the change radius arc that the die cavity circular arc of movable mold (2) is comprised of two kinds of different circular arcs of curvature.

2. the predeformation mode structure of a kind of tube bending mould according to claim 1, is characterized in that: when 1<R/d≤1.5, and R1=0.5d, R2=1d, R3=0.4d, H=0.6d; When 1.5<R/d<3.5, R1=0.5d, R2=0.98d, R3=0.35d, H=0.55d; When R/d >=3.5, R1=0.5d, R3=0.5d, H=0.5d.

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