Though often underestimated, tube end preparation is one of the most critical processes in obtaining an optimum seal of any flanged, brazed, flared or preset tube end connection. When properly performed, the three steps, outlined below, of cutting, deburring, and cleaning will assure the integrity of your tube and prevent leakage in your tube fitting connections caused by improper tube end preparation. These guidelines are similar for all tube, r egardless of the tube material.

• Ms Flareless Fittings
• Parker Ferrule Presetting Tool

Flareless Presetting Tool. Ferrule presetting tool 1. Hand Presetting Tool for Flareless Tube Fittings. Presetting Tools; Featured Product. Hy-Lok offers instrument tube. SAE J514 Flareless Tube Fittings; DIN 2353; Weld Fittings.

Tube Cutting It is critical that the tube be cut squarely within ±1° in order to assure the proper connection. If it is not cut squarely, it will not rest properly in the braze sleeve (ORFS connection) or fitting body (flareless connection). Free rapidshare downloader.

A tube end that is not cut squarely may also result in a flange or flare that is not circular. Issues that can occur with tube ends that are not cut squarely When cutting tube in preparation for flanging, brazing, flaring or presetting, a saw with a toothed blade is recommended. This type of tool will assure that the tube end is cut clean, with minimal burrs or contamination, and is not exposed to excessive heat or working of material, typical of abrasive saws and tube cutters. For Harder metal such as steel and stainless steel tubes, we recommend the use of a. However, if you do not have access to one, you can use a hacksaw with a instead. Improper cut (left) and proper cut (right). The improper cut is showing what happens when a rotary cutter is used on harder materials, in this case steel.

Rotary tube cutters may be used with soft tube such as copper and aluminum. However, for steel and stainless tube rotary cutters will cold form the tube, hardening the material and creating excessive I.D. Collapse or burr. The hardened material causes problems during end forming.

All of this can compromise the tube sealing surface. When cutting your tube, make sure that the tube is securely in the vise, then slowly cut through the tube to minimize the burrs. Tube Deburring Deburring the inside and outside diameter of the tube end is necessary to assure the tube fits properly inside the braze/flange/flare sleeve or ferrule and fitting body. Proper deburring of the tube end is also necessary to form a tube flange or flare which is free of imperfections that may create a leak path between the tube and the fitting sealing surface. You should lightly deburr the I.D. Of the tube end to remove burrs and sharp edges.

You can use either a or a. It is important not to remove too much material when deburring tube ends as it can be detrimental. Just lightly breaking off the edge is sufficient. Tip: if using a hand deburring tool, point the tube end downward while deburring to keep chips from entering the tube. Tube Cleaning Debris may remain in the tube end from both the cutting and deburring processes. Debris present in the tube end can result in system contamination or can be lodged (or can embed itself) into the flange or flare, which may result in imperfections on the tube surface that can lead to potential leak paths.

It is recommended that the tube end be cleaned properly prior to any further processing such as flanging, flaring, brazing or presetting. To clean your tube after cutting and deburring, use a brush to remove chips from the inner diameter, then use a clean rag to wipe the inner and outer surfaces of the tube end. In conclusion, following these steps every time will assure the integrity of the tube and prevent possible leakage in your hydraulic tube fitting connections caused by incorrect tube end preparation issues.

Do you have any additional tips or stories from the field about tube end preparation? If so, please share by commenting using the link above. If you have any questions or comments, please post them and we will respond if warranted. To talk to our techConnect engineer team directly, they can be reached at, 614.279.7070. Did you find this post helpful? TFD techConnect is a technically-focused monthly blog written for engineers specifically around motion and control engineering challenges.

Do you want to receive new product announcements and technology updates from Parker Tube Fittings Division?. Contributed by Burleigh Bailey, senior project engineer, Parker Tube Fittings Division.

Use a deburring tool to remove burrs from the NOTE: A flareless-tube connector may be inside and outside of tube. Remove filings, chips, and used as a presetting tool in case of an grit from inside the tube. Clean the tube. Select the emergency. However, when connectors are proper size die blocks, and place one-half of the die used as presetting tools, aluminum connectors block into the flaring tool body with the countersunk should be used only once, and steel end towards the ram guide. Install the nut and sleeve, connectors should not be used more than five and lay the tube in the die block with 1/2 inch times. Protruding beyond countersunk end.

Place the other half of the die block into the tool body, close latch plate, and tighten the clamp nuts fingertight. Insert the upset flare punch in the tool body with the gauge end toward the die blocks. The upset flare punch has one end counterbored or to gauge the amount of tubing needed to form a double lap flare. Insert the ram and tap lightly with a hammer or mallet until the upset flare punch contacts the die blocks, and the die blocks are set against the stop plate on the bottom. Use a wrench to tighten the latch alternately, beginning with the closed side, to prevent distortion of the tool. Reverse the upset flare punch; insert the upset flare punch and ram into the tool body.

Tap lightly with a hammer or mallet until the upset flare punch contacts the die blocks. Remove the upset flare punch and ram. Insert the finishing flare punch and ram. Tap the ram lightly until a good seat is formed (fig. Check the seat at intervals during the finishing operation to avoid overseating. Special procedures are used in the presetting operation. Select the correct size presetting tool or a flareless fitting body.

Ms Flareless Fittings

Clamp the presetting tool or flareless fitting body in a vise. Slide a nut and then a sleeve onto the tube, and make sure the pilot and cutting edge of the sleeve points toward the end of tube. Select the lubricant from table 6-4, and lubricate fitting threads, tool seat, and shoulder sleeve.

Place the tube end firmly against the bottom of the presetting tool seat, while slowly screwing the nut onto the tool threads with a wrench until the tube Flareless Fitting Preparing tube ends for flareless fitting requires a presetting operation whereby the sleeve is set onto the tubing. Presetting is necessary to form the seal between the sleeve and the tube without damaging the connector. Presetting should always be accomplished with a presetting tool, such as the one shown in figure 6-15. These tools are machined from tool steel and hardened so that they may be used with a minimum of distortion and wear.

Parker Ferrule Presetting Tool

Figure 6-14.—Tube position and resulting flare. Figure 6-15.—Presetting flareless-tube assembly.