RU1808464C - Method for partial removal of polymer from flexible hollow article - Google Patents

Abstract

Usage: the field of engineering, processing of non-rigid hollow products with a polymer coating. SUMMARY OF THE INVENTION; A rod that is able to rotate together with the product is introduced into the cavity of the product, and the relative feed motion is perpendicular to the axis of rotation of the product, with the cutting edge of the tool parallel to the axis of rotation. 1 s.p. f-ly, 2 ill.

Description

The invention relates to mechanical engineering and, in particular, to machining on metal-cutting equipment.

Known processing methods on metal-cutting equipment, which are characterized in that the relative rotational movement of the cutting and feed are communicated to the product and tool.

However, these methods do not allow partial removal of the polymer from the non-rigid hollow product due to the fact that the contact of the cutting edge of the cutter with the product is accompanied by the appearance of a radial component of the cutting force. This force significantly deforms the non-rigid product. When the longitudinal feed is turned on, such deformation leads to the appearance of a wave on the surface of the product, to distortion of the shape and, as a result, to a violation of the integrity of the frame by the cutter and to a loss of stiffness.

The method is illustrated in FIG. 1 and 2.

There is a method for partially removing polymer from a non-rigid hollow article, adopted as a prototype. The known method is used to partially remove a rubber polymer from a multilayer metal hose reinforced with a steel wire frame. Such hoses are used in the hydraulic systems of various machines, and their ends are protected from the upper layer of the rubber polymer for fastening the connecting elements (fittings) to the frame.

In order to remove the rubber polymer of the upper layer, the product is placed in a clamp, it is surrounded by special knives around the circumference (Fig. 16), the knives are moved perpendicular to the axis of the article to a depth equal to the thickness of the rubber polymer layer on the frame, and cut through it. Then include a longitudinal feed of the knife, which pulls the layer of rubber from the frame.

However, this well-known method used at the machine-tool plant

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The main disadvantage is the limited scope. It is impossible to cut through a polymer coating with special knives, which has higher strength and hardness. Than a rubber polymer, on the entire bast of the polymer layer on the frame, especially if this depth is significant. But even if this operation succeeds, the ring knife 1, moving along the product during longitudinal feeding, always violates the integrity of the frame and partially disables it. To restore the integrity of the frame of the product, a plant using the known method wraps the frame at the end with aluminum tape 2, a thickness of (1.0 1.2) mm and compresses it in a special tool in the direction indicated by arrows G (Fig. 1e).

The aim of the invention is to improve product quality and increase productivity.

The goal is achieved by the fact that the product and the tool are informed about the relative rotational movement of the cutting and the feed, and a rod that is able to rotate together with the product is introduced into the cavity of the product, and the relative feed motion is perpendicular to the axis of rotation of the product, while having the cutting edge tool parallel to the axis of rotation of the product.

The essence of the method is illustrated in FIG. 2.

An article 1 is shown, the basis of which is a steel metal frame mounted between the rubber polymer 3 and 4. At one end, the article 1 is mounted in the machine holder 5. From the opposite side, a rod b is inserted into the cavity of the article, which is rotatably with the article, placed in bearings 7 of the center 8 mounted in the tailstock quill. Cutter 9 has a wide cutting

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an edge 10 parallel to the axis of rotation of the article.

Partial removal of the polymer is as follows. The article 1 is clamped in the chuck 5 and rotated. Moving the tailstock with the rod 6, a rod is inserted but the internal cavity of the article. Then the cutter 9 is moved perpendicular to the axis of rotation of the product by an amount equal to the thickness of layer 4. Due to the location of the cutting edge of the cutter parallel to the axis of rotation of the product and the absence of longitudinal feed, the transverse deformation of the rubber polymer is insignificant, since the radial force affects the product along sufficiently developed contact surface. The steel rod inserted into the cavity of the product also helps to reduce deformation. If the rod 6 does not rotate together with the product 1, the friction of the rod against the polymer leads to heating and even to reflow, scoring, i.e. to loss of geometry, which is unacceptable.

In addition, due to the lack of longitudinal movement of the tool relative to the product, a wave of the outer layer of the rubber polymer cannot occur. The latter circumstance makes it possible to completely exclude damage to the metal frame by the cutter or its expansion.

Claims (1)

SUMMARY OF THE INVENTION A method for partially removing polymer from a non-rigid hollow article with a skeleton, according to which the relative rotational movement of the cutting and the feed is conveyed to the product and tool, characterized in that a rod having the ability to rotate together with the product is introduced into the cavity and the relative feed motion is perpendicular to the axis of rotation of the article, while positioning the cutting edge of the tool parallel to the axis of rotation of the article.