DE102006015389A1 - Area-wise deburring and/or rounding of work pieces with a high pressure liquid jet having a dissolved abrasive additive - Google Patents

Abstract

In the area-wise deburring and/or rounding of work pieces, a jet liquid is deflected at a rotating impact body (31) processed towards the work piece region (29). The jet liquid is released with a high speed and high pressure (1500-4000 bar) from a jet device (21). Independent claims are included for: (1) a liquid jet; (2) an impact body; and (3) a high pressure-resistant component of a fuel injection system.

Description

From the DE 199 53 131 For example, a method and an apparatus for rounding the edges of a workpiece are known.

there becomes the edge to be rounded with the help of an erosive liquid rounded. To increase the effectiveness of rounding can be arranged in the region of the edge to be rounded a flow guide, the ensures that the flow velocity the erosive fluid increases in the area of the edge to be rounded and, as a result, the removal rate is increased.

In many mechanically, thermally or otherwise highly loaded Components are above all the edges, for example in the area of bore intersections, particularly heavily loaded. To the load capacity of these components too increase, it is known to round these edges.

Of the Invention is based on the object, an apparatus and a method provide, with the help of workpieces of different geometry even inaccessible Points can be rounded and / or deburred.

These The object is achieved by a method for deburring and / or rounding of workpieces, at the workpiece at least partially with a jet under high pressure a jet liquid is deburred and / or rounded, wherein in the jet liquid an abrasive additive is present in the jet fluid solvable is.

Advantages of invention

By the inventive method Is it possible, on the one hand to take advantage of an abrasive blasting liquid, without itself to incur disadvantages.

conventional beam liquids with abrasive additives, have the disadvantage that the workpieces after processing very carefully need to be cleaned to ensure that no abrasive additive remains in the workpiece. If unwanted manner in the workpiece some abrasive additive remains, leads this to premature wear or even a complete one Failure of the workpiece. The cleaning is especially for workpieces with complicated internal geometry, such as injectors of injection systems, common rails, etc., only with very high technical effort with 100% certainty to ensure.

Thereby, that in the inventive method a jet fluid with a removable abrasive additive is used is guaranteed that no abrasive additives in the workpiece remain, but by simply rinsing the workpiece the entire in and on the workpiece adhesive abrasive additive solved and rinsed out can be. This is the failure of the vermontierten component excluded due to Abrasivzusatzresten and it results significant economic benefits. In addition, the lifespan and the reliability the method according to the invention deburred and / or rounded components are increased.

The inventive method also works very inexpensive, because soluble Abrasivzusätze usually not more expensive than conventional abrasive additives, such as e.g. Carbide, garnet sand, glass beads or other conventional Abrasive.

Around the efficiency the method according to the invention to increase, can in a further advantageous embodiment of the method according to the invention the blasting liquid on a baffle in Direction of the machined portion of the workpiece deflected become. This makes it possible in many cases that the jet liquid at an optimum angle to the edge to be deburred or to be rounded portion of the workpiece, so that the Effect of blasting fluid is optimized.

It It goes without saying that the benefits of an impact body also then come to fruition when the blasting fluid is a conventional abrasive additive having.

It has proved to be advantageous when the jet liquid with a pressure of 1,500 bar to 4,000 bar from a blasting tool exit.

The Advantages of the invention are also realized by a blasting fluid with abrasive additive for machining workpieces, when the abrasive additive is soluble in the jet liquid. As a particularly advantageous it has been proven that the jet liquid is a liquid water-based and the abrasive additive is a water-soluble substance especially sodium tetraborate, sugar, potassium sulfate, sodium carbonate, Trisodium phosphate and / or magnesium phosphate.

Furthermore, it is also possible that the Abrasivzusatz consists at least partially of frozen water, carbon dioxide and / or nitrogen. Which of the aforementioned abrasive additives in a particular case preference is given depends on the existing blasting equipment and the requirements placed on the finished workpiece. Furthermore, the material of the workpiece to be machined also plays a role in the selection of the blasting fluid and the abrasive additive.

Of course it is the invention is not limited to the aforementioned Abrasivzusätze, but it can in principle all releasable Abrasivzusätze be used, with particular abrasive additives with high specific Weight be preferred.

The The problem underlying the invention is also solved by an impact body with a curved baffle, being the guide surface a first portion in which the guide surface substantially tangent to the incident jet liquid, and being the guide surface a second portion in which the guide surface substantially directed to a region of the workpiece to be machined.

alternative can the guide surface also have a convex or dome-shaped area the beam hits. Finally, it is also possible that baffle form in the form of a thread and the impact body during the Machining to rotate so that the deflected by the baffle jet liquid directed to different areas of the workpiece to be machined becomes.

Thereby Is it possible, even at hard to reach Placing the workpiece the blasting liquid optimally at an optimal angle to the area to be machined of the workpiece to judge, so that the effectiveness of the blasting process according to the invention elevated becomes.

It has proven to be advantageous when the transition between the first Section and the second section of the guide surface without abrupt changes of direction he follows. As a result, the energy losses during deflection of the jet liquid minimized and at the same time the wear on the guide surface of the impact body reduced.

Especially if the intersections of two holes are to be rounded, it is advantageous if the guide surface is rotationally symmetrical.

It has further been found to be advantageous, the guide surface of a impact body made of a very hard and / or wear-resistant material, in particular polycrystalline diamond or cemented carbide.

The The problem underlying the invention is at high pressure Components of a fuel injection system of an internal combustion engine with solved at least one Bohrungsschneschneidung that the bore intersection with one of the preceding methods Deburred and / or rounded.

Further Advantages and advantageous embodiments of the invention are the subsequent drawing, the description and the claims can be removed. All features disclosed in the drawings, the description and the claims can be essential to the invention both individually and in any combination.

drawings

It demonstrate

1 a flowchart of an embodiment of a method according to the invention;

2 a simplified sectional view of a mixing head;

3 a Bohrungsschnechnidung during processing according to the inventive method and

4 to 6 Embodiments of inventive impact body.

description the embodiments

In 1 a flow chart of an embodiment of a method according to the invention is shown. With the reference number 1 is the start of the procedure called.

In a first step 3 the jet liquid, preferably water, is brought to a high pressure, preferably in the range between 1,500 bar and 4,000 bar, with the aid of a high-pressure pump.

In a further step 5 the jet liquid is passed through a nozzle 14 greatly accelerated and occurs at very high speed as a jet 16 out.

In one step 6 is in a mixing chamber 15 a detachable abrasive additive 20 sucked in by the resulting negative pressure and by the jet liquid (jet 16 ) entrained and accelerated.

In a subsequent step 7 becomes the beam 16 the blasting fluid mixed with abrasive additive in a mixing tube 19 guided and exits at the end of the blasting tool.

In a next step 8th becomes the jet emerging from a jet tool 21 the mixed with abrasive additive blasting liquid on a baffle 31 deflected and then the jet liquid reaches the workpiece. The actual abrasive machining of the workpiece is denoted by the reference numeral 9 Mistake.

After processing, the solution of Abrasivzusatzes takes place in the jet liquid (reference numeral 11 ), so that no residues of Abrasivzusatzes remain in and on the workpiece.

If the geometry of the workpiece allows it, can also on the processing step 7 , namely, the deflection of the high-pressure jet of the jet liquid on a baffle body, be dispensed with.

In 2 is a mixing head 13 greatly simplified and shown partially cut. In the in 2 upper area becomes a mixing chamber 15 both blasting liquid, which has a high speed and is preferably water, as well as an abrasive additive 20 through a feeder 17 fed.

Over a cone-shaped section 18 the mixing chamber goes 15 in a mixing tube 19 above. In the mixing tube 19 has the with the abrasive additive 20 Staggered jet liquid a very high speed. As a result, is also the kinetic energy, respectively, the momentum of the mixing tube 19 emerging beam 21 very large. The beam 21 the blasting liquid carries out the actual processing of the workpiece (not shown).

In 3 is a bore intersection of a component 23 , shown in section during processing by the method according to the invention. The component to be machined 23 has an interior 25 into, into which a bore 27 empties. The bore intersection is in 3 with the reference number 29 Mistake. When introducing the hole 27 into the component 23 usually arises in the area of the bore intersection 29 a ridge (not shown). In any case, the bore intersection is 29 mechanically loaded as soon as the interior 25 of the component 23 is filled with a high pressure liquid medium. For this reason alone, it is necessary to drill intersection 29 to round. At the same time may need to at the Bohrungsverschneidung 29 existing burrs before commissioning of the component 23 be removed reliably, otherwise they could loosen during operation and get into the connected product functional areas. There, these metal chips would lead to malfunction or even total failure of the product.

According to the invention is now provided, with the aid of a mixing head 13 of which in 3 only the mixing tube 19 shown is the bore intersection 29 to deburr and / or round off. This is in the interior 25 of the component 23 an impact body 31 introduced. In the area of bore intersection 29 indicates the baffle 31 a guide surface 33 on. At the in 3 shown application example of the method according to the invention is the guide surface 33 designed rotationally symmetrical and serves to the beam 21 coming out of the mixing tube 19 so as to divert it to the bore intersection at an optimum angle, which may be, for example, about 45 ° 29 meets. The current strands of the through the guide surface 33 deflected beam 21 are in detail X the 3 with the reference number 35 characterized.

It goes without saying that the geometry and dimensions of the guide surface 33 must be adapted to the application individually. Because the hole 27 is naturally rotationally symmetric, is also the guide surface 33 at the in 3 illustrated embodiment rotationally symmetrical. The guide surface 33 is at its center as a top 37 formed so that the beam 21 almost tangential to the top 37 incident. At its outer edge 39 has the guide surface 33 an optimal angle, for example, 45 ° to the longitudinal axis of the bore 27 or the longitudinal axis of the interior 25 of the component 23 can amount. This ensures that the blasting fluid is at an optimal angle to the bore intersection 29 impinges, so that the deburring and rounding takes place as quickly as possible and with high removal rate.

In 4 is another embodiment of an impact body according to the invention 31 shown in section. Also in this embodiment of an impact body 31 is the guide surface 33 rotationally symmetrical. The outer edge 39 the guide surface 33 is similar to the embodiment of an impact body 33 according to 3 educated. The essential difference from the embodiment according to 3 is that the guide surface 33 is formed convex in the middle, so that the liquid jet (not shown) perpendicular to the convex surface 41 incident. The convex surface 41 deflects the jet (not shown) radially outwards, so that the deflected jet liquid over the outer edge 39 the guide surface 33 is directed to the edge of the component to be rounded (not shown).

In the 5 and 6 are further embodiments of inventive impact body 31 shown. Unlike the previously described embodiments, the guide surface is 33 in the embodiments according to 5 and 6 not rotationally symmetrical, but formed in the form of a helix. The shape of the fins 33 at according to the embodiments 5 and 6 are similar to a screw thread. The essential difference between the embodiments according to 5 and 6 is that in the embodiment according to 5 the thread, which is the guide surface 33 is formed sharp-edged at the top of its thread flank, while the tip of the thread flank in the embodiment according to 6 is rounded and a radius 45 having.

If desired, the thread 43 of the impact body 31 be rotated during machining, so that the jet liquid is directed to different areas of the workpiece to be machined.

It goes without saying that the inventive method and the impact body according to the invention 31 can be used in a variety of constellations to deburr and / or round a variety of workpieces.

Claims (17)

Method for deburring and / or rounding workpieces ( 23 ) characterized by the following method steps: at least partial deburring and / or rounding of a workpiece ( 23 ) with a high pressure jet ( 21 ) of a blasting liquid, wherein an abrasive additive is present in the blasting liquid and wherein the abrasive additive is soluble in the blasting liquid. A method according to claim 1, characterized in that the jet liquid at an impact body ( 31 ) in the direction of the area to be processed ( 29 ) of the workpiece ( 23 ) is deflected. A method according to claim 1 or 2, characterized in that the blasting fluid at a high speed from a jet tool ( 13 ), and that the speed results from a pressure of 1500 bar to 4000 bar. Method according to one of the preceding claims "characterized in that the impact body ( 31 ) rotates during processing. Blasting fluid with abrasive additive for machining workpieces ( 23 ), characterized in that the Abrasivzusatz is soluble in the jet liquid. jet liquid according to claim 5, characterized in that the jet liquid a liquid is water-based. jet liquid according to claim 5 or 6, characterized in that the abrasive additive at least partly of sodium tetraborate, sugar, potassium sulphate, Sodium carbonate, trisodium phosphate and / or magnesium phosphate. jet liquid according to one of the claims 5 to 7, characterized in that the abrasive additive at least partly from water, carbon dioxide and / or nitrogen in frozen Condition exists. Impact body with a curved guide surface ( 33 ), wherein the guide surface ( 33 ) a first section ( 37 ) in which the guide surface ( 33 ) substantially tangential to the jet ( 21 ) of the jet liquid, and wherein the guide surface ( 33 ) a second section ( 39 ) in which the guide surface ( 33 ) substantially to a region to be processed ( 29 ) of the workpiece ( 23 ). Impact body with a curved guide surface ( 33 ), wherein the guide surface ( 33 ) a first section ( 37 ) in which the guide surface ( 33 ) convex ( 41 ) is formed, and wherein the guide surface ( 33 ) a second section ( 39 ) in which the guide surface ( 33 ) substantially to a region to be processed ( 29 ) of the workpiece ( 23 ). Impact body with a curved guide surface ( 33 ), wherein the guide surface ( 33 ) in the form of a thread ( 43 ) is trained. Impact body according to claim 11, characterized in that the thread ( 43 ) is designed as a pointed thread or round thread. Impact body according to one of claims 9 to 12, characterized in that the transition between the first section ( 37 ) and the second section ( 39 ) of the guide surface ( 33 ) without abrupt changes of direction. Impact body according to one of Claims 9, 10 and 13, characterized in that the guide surface ( 33 ) is rotationally symmetric. Impact body according to one of claims 9 to 14, characterized in that the impact body ( 31 ) in the area of the guide surface ( 33 ) consists of a very hard and / or wear-resistant material, in particular polycrystalline diamond or hard metal. High-pressure loaded component of a fuel injection system of an internal combustion engine, with a bore intersection ( 29 ), characterized in that the bore intersection ( 29 ) is deburred and / or rounded with one of the preceding methods. High pressure loaded component, thereby ge indicates that it is an injector, an injection nozzle, a common rail or a high-pressure fuel pump.