EP2452783A1 - Striking mechanism body, striking mechanism and hand-held machine tool with a striking mechanism - Google Patents

Abstract

The structure has percussion portions and striking mechanism portions that are provided with respect to contacting surface and side surface. Several pulses are transmitted to the side surface and stop surface. The percussion portions are made of higher resistant materials than the materials of the striking mechanism portions. Several steel structures are integrated at the surface of the main structure. The heat treatment process of the materials of percussion portions is different from the heat treatment process of materials of striking mechanism portions. An independent claim is included for percussion mechanism.

Description

Technical area

The invention relates to a percussion body, in particular a racket and / or striker (striker), an impact mechanism on a hand tool, with a side surface and a stop surface, by means of a pulse to a pulse-receiving part is transferable, wherein at least a first the stop surface and / or the percussion body part having the side surface is formed of a first material and an adjacent, preferably adjoining, second percussion body part is formed of a second material and wherein the first material is made more resistant than the second material in at least one material condition. The invention also relates to a striking mechanism with a drive which accelerates, directly or indirectly, acts on at least one movable percussion body with a side surface and a stop surface, wherein a pulse of the percussion body is transferable to a pulse-receiving part. The invention also relates to a hand tool.

A portable power tool such as a percussion drill, a chisel or a hammer drill has a percussion mechanism capable of imparting a pulse impulse to a tool in the portable power tool at a suitable repetition rate. For this purpose, the above-mentioned percussion on a drive which accelerates - directly or indirectly - acts on a movable percussion body such as a racket or firing pin. The drive of the percussion mechanism can be formed, for example, with an eccentric wheel mounted on a drive bearing, which causes a piston to move in a stroke, which then pneumatically, for example, pneumatically drives the striker to a reciprocating motion and in turn drives it stimulates the firing pin. A pulse pulse is thus transmitted from the directly driven racket of the percussion first to the firing pin and then from the firing pin to the tool shank of the tool.

The percussion body has a side surface and a stop surface. Regularly, the pulse impulse of the impactor body is transmitted to the abutment surface on a pulse-receiving part. The impulse receiving member may be a tool of the power tool, for example, a drill or a bit, which receives the impulse shock on a top surface of a tool. Impulse transmitting stop surfaces are mainly used for impulse transmission between percussion bodies within the percussion, so for example between a racket and a firing pin. Schlagwerk parts of the percussion have to withstand relatively high loads, in particular on a stop surface and / or side surface.

State of the art

Known is a percussion body of an insert or tempering steel, which is heat treated, for example, as a whole by case hardening, tempering or otherwise and as such in one piece over the entire percussion body reaching identical properties, in particular also on the abutment surface and side surface has identical properties. It has been found that a percussion body is exposed to different stresses in different areas, which make different demands on the material of the percussion body. The requirements are all the more serious with increasing energy density in a striking mechanism, ie with increasing ratio of energy input to component size of a percussion body. For example, in JP 101 69 358 A tries to increase the energy density in a striking mechanism by increasing the specific gravity of a percussion body. Even with the use of very high-quality materials and conventional heat treatment processes for a percussion body, it is ultimately impossible to avoid excessive stresses and premature material fatigue in a percussion body at the highest energy densities. The decisive factor is the momentum and moving mass that results from the transmission of a percussion body in relation to the resistance of the material of the percussion body, in particular to its abutment surface and / or side surface. In addition, larger impact masses of a percussion body always mean a larger one Installation space of the impact mechanism in terms of diameter and length, which leads to larger and possibly disproportionately heavy machines.

Thus, for example, from WO 99/67063 measures are known which seek to reduce the weight of a drive piston for an air spring percussion by a piston suspension consists of a plastic material. Also are out US 3,114,421 or JP 2006 123025 A Further measures known to set a percussion body mass by means of different material densities. However, these measures are inadequate, since on the one hand only an insufficient connection of different Schlagwerksteilmassen can be achieved. On the other hand, in any case, the most stressed areas of a percussion body, namely stop surfaces and side surfaces, prove to be insufficiently resistant. In the alternative, for example, are off JP 8197458 A or DE 103 044 07 A1 or DE 922 038 Schlagwerkskörper with cavities known that filled with plastic or Einzelteilchen, dampening effect on the movement of the percussion body.

By such measures, it is not possible to combat negative effects such as the so-called lookup or the generation of high tensile stresses in a deployment tool. Only limited are negative effects such as a spark as in JP 10156757 A described in that parts of a beryllium-copper compound or reinforced plastic are glued or welded to colliding parts of a racket and a firing pin. Such a JP 10156757 A However, these parts regularly prove to be insufficiently resistant.

Presentation of the invention

It would be desirable to improve a percussion body in terms of the above-discussed resistance disadvantages.

At this point, the invention begins, whose object is to provide a percussion body, in which a resistance is given in an improved manner. In particular, the resistance of a percussion body to be improved in particularly stressed areas such as stop and / or side surfaces. In particular, a resistance to be improved without a percussion body is disadvantageously composed or adversely limited in its mass design and expansion. In particular, it is an object of the invention to provide a percussion body which comparatively in particularly stressed areas resistant, without substantial losses in terms of mass design and space requirements would have to be provided. In particular, this should be possible even with increasing impact energy. The object of the invention is also to provide a corresponding striking mechanism with at least one percussion body, in particular rackets and striker. The object of the invention is also to provide an improved hand tool.

The task with respect to the percussion body is achieved by a percussion body of the type mentioned, is provided in accordance with the invention that the percussion body is formed as a one-piece steel body.

It is provided in a first variant according to the invention that the first material and the second material are materially equal and the first material of the first percussion body part has a different heat treatment than the second material of the second percussion body part. In particular, this heat treatment can be carried out only on the first material of the first percussion body part. As a result, the first material can be given a higher resistance in at least one material composition than the second material.

In a second variant according to the invention it is provided that the first and the second material are materially different materials and the first and the second percussion body part, in particular cohesively, are joined together. The second variant also leads to a one-piece steel body of the percussion body. By means of a first material designed with higher resistance, the first striking mechanism body part can be given a higher resistance than the second striking mechanism body part.

In particular, optionally only in the second variant, only the first material may have a heat treatment or a different heat treatment than the second material. According to the second variant, the first and second different material may additionally be provided with different heat treatments in order to advantageously increase the effect of the second variant. It may be the first material of the first percussion body part have a different heat treatment than the second material of the second percussion body part and the first and the second different material are joined together materially.

The first striking mechanism body part according to the concept of the invention comprises the stop surface and / or the side surface of the hammer body. In particular, a stop surface and a side surface of a percussion body have proven to be particularly stressed areas of the percussion body.

The invention is based on the consideration that at the impulse-transmitting contact zones between percussion body and impulsaufnehmendem part - ie, for example, on a stop surface between the racket and firing pin or on a stop surface between the firing pin and tool - a particularly high impact load is present. The impact stress causes a shock wear and on the other hand carries the danger of surface fatigue, the so-called "pitting".

In addition, it can be assumed with regard to the side surfaces of a comparatively high high-frequency tension-pressure alternating load, which provides comparatively high demands on the permanent alternating strength of a side surface, especially by notch effects on waisted cross-sectional areas such as sealing grooves and diameter transitions.

Based on this consideration, the invention has recognized that the first percussion body part-in particular at least the abutment surface and / or the side surface-is formed as required with the first material resistant in at least one material condition. This measure is partially made only on the first percussion body part, while a second percussion body part is designed differently, in particular without the said measure. In simple terms, the concept of the invention furthermore makes it possible to impart to the first percussion body part a comparatively high resistance to the second percussion body part by integrally forming the percussion body as a steel body -as a urgeformte one-piece steel body or as cohesively composite steel body.

According to the first variant, this is done in that the first percussion body part has a different heat treatment than the second percussion body part. This also includes that only the first impactor body part has a heat treatment. This also includes that the first impactor body part has a higher-value heat treatment and the second impact body has a comparatively lower-grade heat treatment. Higher and lower values are to be understood with regard to at least one material quality which increases the resistance, such as hardness or toughness. It has also proven to be advantageous to design a second striking mechanism body part less resistant, for example, to design it comparatively elastically or for oscillating stresses.

Overall, the concept of the invention results in the percussion body made of different materials and / or identical materials with different heat treatments in one piece as a steel body available. Partially provided for particularly stressed areas of the percussion body a particularly resistant material available -sei it as a particularly resistant first material and / or as provided with a particularly advantageous heat treatment first material.

The concept of the invention also leads to a striking mechanism according to claim 14, in particular to a percussion mechanism, in which a racket and / or a firing pin is designed as a percussion body of the aforementioned type.

The concept of the invention also leads to a hand tool according to claim 15 with an aforementioned striking mechanism.

Advantageous developments of the invention can be found in the dependent claims and specify in particular advantageous ways to realize the above-described concept within the scope of the problem and with regard to further advantages.

The material composition is particularly preferably selected from the group consisting of: density, modulus of elasticity, toughness, wear resistance, strength. Regarding the stop surface, it has proved to be particularly advantageous to provide the first material, in particular wear-resistant, impact-resistant and with a comparatively low modulus of elasticity. In other words, it has proved to be particularly advantageous that the first material has a comparatively high wear resistance, a high toughness and / or a comparatively low modulus of elasticity. In particular, it has proved to be advantageous for the second material of the second impact-mechanism body part to have a comparatively high density and a comparatively high strength, in particular duration-alternating strength. A particularly preferred embodiment of this development is described in detail with reference to the drawing.

In particular, with regard to the first variant according to the invention, it has proved to be advantageous that the other heat treatment of the first percussion body part Tempering and / or carburizing is. Also possible is nitriding or nitrocarbonating. Also possible are other diffusion-based heat treatments in which C or Ni or other alloy constituents diffuse. Possible combinations are also possible. The type of heat treatment and the selection of the area of the first striking mechanism body part for a partial heat treatment and / or the second percussion body part can be made appropriately and as needed on the percussion body.

In a particularly preferred development of the one-piece steel body may have at least two different first percussion body parts, which have the other heat treatment. In particular, two different first percussion body parts may be provided which have different heat treatments. For example, it has proved to be advantageous for a first striking mechanism body part to comprise the front-side and another first striking mechanism body part the rear abutment surface of a percussion body and in each case be provided with a carburizing heat treatment. Yet another, for example, interposed first impactor body part is advantageously provided with a tempering heat treatment. This can be used to form a particularly permanent change-resistant side surface of the percussion body.

Thus, the first percussion body part can have a comparatively low modulus of elasticity with comparatively high impact resistance and wear resistance. In particular, the second striking mechanism body part can have a comparatively high density with a comparatively high permanent change strength. A particularly preferred treatment, which is described by way of example in the drawing, leads to a comparatively wear-resistant, impact-resistant and low-elastic stop surface and / or to a side face of the percussion body which is particularly resistant to permanent change.

Particularly advantageous is the steel of the steel body-preferably the first material of the first Schlagwerkskörperteils- a steel selected from the group case steel, tempering steel, tool steel.

A tempered steel is generally characterized by a comparatively high toughness at a given tensile strength. It has a high resistance to breakage, a high static and dynamic load capacity and good hardenability. Typical representatives are listed in DIN EN10083. Typical typical representatives are those with a higher content on alloying elements, in particular also a higher content of carbon C such as, for example, tempered steels 36 NiCrNo 16 or 51 CrV6.

Preferably, a tool steel, for example, a martensite tool steel with a C content above 0.3%, 0.6%, 0.8% or 1% may be provided. These are, above all, steels which are suitable for working and processing materials, as described, for example, in DIN 17350; expanded to include steels for plastics processing and powder-metallurgically produced tool steels. Advantageously, a martensite with a comparatively high C content between 0.6% and 1.6% is related in a first modification - this has a particularly high hardness. Martensite has also proved to be advantageous with special carbides having a C content between 1% and 2% and with up to 12% Cr and alloying elements such as W, Mo, V. Particularly heat-resistant and temperature-resistant Martensite can also secondary carbide with having a C content between 0.3% to 0.4%, and up to 5% Cr and alloying elements Mo, V. A particularly hard martensite with good wear resistance has primary carbides and secondary carbide precipitates of 0.8% to 2% C content and up to 18% (W + 2xMo) alloying constituent and up to 4% V and up to 10% Co alloying constituent.

Case hardening steels as non-alloyed and low-alloyed steels with a maximum carbon content of 0.2% can also prove advantageous if required. In particular, low-carbon case-hardening steels can be set-hardened in a carbon-containing atmosphere and annealed, annealed or carburized to temperatures between 880 ° C and 1050 ° C. As a result, it is possible to achieve a carbon content in the surface layer up to about 0.8%, even with case-hardened steels, so that the hardening on the surface of the percussion body and / or percussion body part is more effective than in the interior. As a result, when using case hardening, annealing or carburizing, as a heat treatment, a first percussion body part having a high toughness and significantly higher hardness on the surface and thus high resistance to wear is provided.

Particularly advantageously, in particular for the first striking mechanism body part, a material in the form of high-carbon steel, in particular as manganese high-carbon steel, can be used. Particularly advantageous is, for example, a X120Mn12 manganese high-carbon steel with a manganese content of Mn 11% to 13%. In principle, however, manganese contents between 11% to 19% may be provided for manganese steel. These have an initial hardness of approximately 200 HB on. Depending on the alloy design of a manganese high-carbon steel, heat treatment and load 450 - 600 HB, optionally 650 HB can be reached during operation. Such a so-called austenitic austenitic manganese high-carbon steel with high ductility and very good work hardening ability obtains its good properties by combining the work hardening capacity with ductility. Hardening occurs whenever manganese high carbon steel is subjected to mechanical stress, eg, by impact or impact, which partially converts the austenite in the surface zone to martensite. In the present case, increases in hardness from 200 to more than 550 HB are possible. Thus, the hardness, in particular of the first percussion body part, increases in the course of use when this is claimed, for example, on the stop surface. Since the abutment surface is also subject to wear due to friction, a surface layer of the abutment surface is constantly removed, with austenite remaining on the surface. Such austenite is in turn converted by renewed mechanical stress. The alloy, which is below the surface zone, is very ductile, and manganese hard steels can therefore withstand high mechanical impact loads without the risk of breakage. This is true even for a comparatively small extent of the stop surface or the first percussion body part.

With reference to the second variant according to the invention, it has proved to be advantageous to design the joint connection as a steel-fitting joint connection, for example as a welded joint. As a welded joint, in particular, a friction welding connection such as a rotational friction welding, linear friction welding, single or multi-orbital friction welding is suitable. In particular, a Mulitorbital friction welding connection has proven to be advantageous for welding non-weldable steels such as in particular manganese high-carbon steel of a first Schlagwerkskörperteils with a steel of the second Schlagwerkskörperteils welding together.

In addition, a cohesive joining connection can also be formed as a solder connection or as an adhesive connection.

In particular, at least partial mechanical joining of the first and second percussion body parts, such as by narrowing, is not excluded. This is preferably suitable for further mounting a wear protection od. Like. Especially on impact areas.

The concept of the invention can be used in particular with its afore-mentioned further developments-it being a development of the first variant or a further development of the second variant optionally in combination with the first variant for a racket and / or a firing pin. A racket can, for example, as described with reference to the drawing, consist of two materials and / or have three separate areas of different heat treatment. A firing pin can for example consist of two materials and / or have five areas of different heat treatment.

embodiments

Embodiments of the invention will now be described below with reference to the drawing. This is not necessarily to scale the embodiments, but the drawing, where appropriate for explanation, executed in a schematized and / or slightly distorted form. With regard to additions to the teachings directly recognizable from the drawing reference is made to the relevant prior art. It should be noted that various modifications and changes may be made in the form and detail of an embodiment without departing from the general idea of the invention. The disclosed in the description, in the drawing and in the claims features of the invention may be essential both individually and in any combination for the development of the invention. In addition, all combinations of at least two of the features disclosed in the description, the drawings and / or the claims fall within the scope of the invention. The general idea of the invention is not limited to the exact form or detail of the preferred embodiment shown and described below or limited to an article which would be limited in comparison to the subject matter claimed in the claims. For the given design ranges, values within the stated limits should also be disclosed as limit values and be arbitrarily usable and claimable. For simplicity, the same reference numerals are used below for identical or similar parts or parts with identical or similar function.

• Fig. 1 einen Schlagwerkskörper in Form eines Schlägers, der in einer ersten Ausführungsform gemäß der ersten Variante der Erfindung als einstückiger Stahlkörper mit identischem Stahlmaterial aber partiell unterschiedlichen Wärmebehandlungen gebildet ist;
• Fig. 2 einen Schlagwerkskörper in Form eines Schlagbolzens, der in einer ersten Ausführungsform gemäß der ersten Variante der Erfindung als einstückiger Stahlkörper mit identischem Stahlmaterial aber partiell unterschiedlichen Wärmebehandlungen gebildet ist;
• Fig. 3 einen Schlagwerkskörper in Form eines Schlägers, der in einer zweiten Ausführungsform gemäß der zweiten Variante der Erfindung als einstückiger Stahlkörper aus zwei unterschiedlichen Materialien stoffschlüssig zusammengefügt ist;
• Fig. 4 einen Schlagwerkskörper in Form eines Schlagbolzens, der in einer zweiten Ausführungsform gemäß der zweiten Variante der Erfindung als einstückiger Stahlkörper aus unterschiedlichen Materialien stoffschlüssig zusammengefügt ist;
• Fig.5 in schematischer Darstellung eine Handwerkzeugmaschine mit einem Schlagwerk und einem Werkzeug, wobei das Schlagwerk einen Schläger und einen Schlagbolzen gemäß einer der Fig. 1 bis Fig. 4 aufweist.

Further advantages, features and details of the invention will become apparent from the following description of the preferred embodiments and from the drawing; this shows in:

• Fig. 1 a percussion body in the form of a racket, which is formed in a first embodiment according to the first variant of the invention as a one-piece steel body with identical steel material but partially different heat treatments;
• Fig. 2 a percussion body in the form of a firing pin, which is formed in a first embodiment according to the first variant of the invention as a one-piece steel body with identical steel material but partially different heat treatments;
• Fig. 3 a percussion body in the form of a racket, which is joined together in a second embodiment according to the second variant of the invention as a one-piece steel body of two different materials cohesively;
• Fig. 4 a percussion body in the form of a firing pin, which is joined in a second embodiment according to the second variant of the invention as a one-piece steel body of different materials cohesively;
• Figure 5 a schematic representation of a hand tool with a striking mechanism and a tool, the percussion a club and a firing pin according to one of Fig. 1 to Fig. 4 having.

Referring first to Fig. 5 This shows schematically a hand tool 1000 with a percussion 100. The present pneumatically trained striking mechanism 100 has a drive A shown schematically. The drive A converts a rotary motion of an electric motor into a reciprocating motion of a piston 300 which acts pneumatically on the racket 10, 30 causing it to reciprocate. In a guide 50, the racket 10, 30 in turn via a in Fig. 5 unspecified stop surface his pulse to the firing pin 20, 40 of the impact mechanism 100 from. The firing pin 20, 40 is also referred to as an anvil, and gives its impulse to the shaft 200 of the tool W on, which is held in an unspecified tool holder of the tool 1000.

A first embodiment of racket 10 and striker 20 is shown in FIG Fig. 1 and Fig. 2 according to the first variant of the concept of the invention. A second embodiment of racket 30 and striker 40 is shown in FIG FIG. 3 and FIG. 4 according to a second variant of the concept of the invention.

Referring now to Fig. 1 this shows a racket 10 with a one-piece steel body 11, which is formed here from a tempering steel, but in one here not shown embodiment may also be formed suitably from a case steel. In the present case, a bolt-side front first percussion body part 12 or a drive-side rear first percussion body part 13 is formed which comprises a front bolt-side abutment surface 12.1 and a rear drive-side abutment surface 13.1. The front and rear first percussion hammer body parts 12, 13 thus designated are carburized in the present case in the context of a partial heat treatment for the steel body 11. This results in a particularly effective hardening of the front or rear stop surface 12.1, 13.1. This is especially advantageous in the case of the front abutment surface 12.1, since it transmits the impulse of the striker 10 to the striker 20 in contact with an associated abutment surface of the striker 20. Both stop surfaces 12.1, 13.1 are thus particularly impact-resistant, wear-resistant and designed with a comparatively low modulus of elasticity.

In this regard, the first material of the so designated first percussion body parts 12, 13 formed more resistant than the remaining material of the steel body 11 in a part 12 adjacent or partially adjacent 13 second percussion body part 15. The latter second percussion body part 15 is not subjected to a separate heat treatment but from the not heat-treated steel-11 tempered steel formed. At the in Fig. 1 shown embodiment of the racket 10 is adjacent to the rear drive-side first striking mechanism body part 13 yet another first percussion body part 14 is formed, the tempering steel of the steel body 11 is partially heat-treated in the region of the other first percussion body part 14 by tempering. Here, too, there is a hardening by carbon diffusion, which is not so strong as in the previously described first front and rear percussion body parts 12, 13. Rather predominates in the other first percussion body part 14 for this portion with the side surface 14.1 of the racket 10 particularly advantageous Toughness.

Fig. 2 shows a likewise following the concept of the first variant of the invention embodiment of a striker (striker) 20, which is formed as a one-piece steel body 21 made of tempered steel and a front, tool-side, first percussion body part 22 and a rear, racket-side, first striking mechanism body part 23 and another first percussion body part 24 has. Similar to the racket 10, the first front and rear impactor body parts 22, 23 thus designated each include front and rear abutment surfaces 22.1 and 23.1 and are carburized as part of a partial heat treatment to impart a particular hardness to the front and rear abutment surfaces 22.1, 23.1. The first one Impact body part 24 is annealed in the context of a further partial heat treatment and gives this percussion body part 24 and the side surface 24.1 a comparatively high toughness. The remaining areas of the steel body 21 are not heat treated as the second percussion body parts 25.1 and 25.2 and have the usual high quality properties of a tempering steel. As a result, only the first percussion hammer body parts 12, 13, 22, 23 and 14, 24 are carburized or tempered for the racket 10 and the firing pin 20 in the context of a partial heat treatment, which actually must have a higher strength or toughness, namely due to the abutment surfaces 12.1, 13.1, 22.1 and 23.1 or side surfaces 14.1, 24.1. In contrast, the less stressed areas of a second percussion body part 15, 25.1. 25.2 manage without additional resistance-increasing heat treatment.

Specifically, the other first percussion body part 14 and 24 on the racket 10 and the firing pin 20 with a number of grooves 16, 26 is provided as needed for inserting a sealing ring or for guiding sound pressure amplitudes in a guide chamber 50 for the Racket 10, 30 and the firing pin 20, 40 serve. In particular, the side faces 14.1, 24.1, which are waisted in cross-section through grooves 16, 26, have diameter transitions and are thus subjected to increased demands on the permanent alternating strength. The present increased toughness of the other first Schlagwerkskörperteile 14, 24 avoids fatigue fractures due to the increased requirements. These are mainly due to notch effects on the mentioned diameter transitions of the grooves 16, 26. In particular, at least on the strongly tapered waisted portions of the grooves 16, 26, it has proven to be advantageous to counteract a notch effect in the context of a partial heat treatment by tempering.

In summary, in the present embodiment with tempering steel for the one-piece steel body 11, 21 of the racquet 10 and the firing pin 20, the first percussion body parts 12, 13, 22, 23 are carburized as part of a partial heat treatment and the other percussion body parts 14, 24 tempered.

Overall, a significant improvement in the service life is to be expected by a targeted adjustment of the material properties depending on the position and in terms of the stress of the percussion parts for racket 10 and firing pin 20. Designed with a racket 10 and a firing pin 20 percussion 100 can realize higher energy densities than previously known percussion.

In another embodiment, not shown here, the steel body 11, 21 of the racket 10 and the firing pin 20 may consist of a case-hardening steel. In this case, it has proven to be advantageous to carburize the first percussion body parts 12, 13 or 22, 23. The other first percussion body parts 14, 24 -at least, however, the grooves 16, 26- which are exposed to an increased notch effect, are to a lesser extent carburized, but at least partially strengthened.

Alternatively, other heat treatment processes associated with diffusion processes, such as diffusion, may be used. Nitriding or nitrocarbonating be used for at least the first striking body parts 12, 13, 22, 23 or to a lesser extent for the other first percussion body parts 14, 24. This can be achieved for the former, above all, an increased hardness and for the latter especially an increased toughness. Also, other surface finishing methods such as shot peening, plating, deep rolling or the like for further partial influencing, in particular the aforementioned first percussion body parts 12, 13, 22, 24 possible.

FIG. 3 and FIG. 4 show second embodiments of a racket 30 and a firing pin 40. The racket 30, the percussion body parts 32, 35 are made of different materials. When firing pin 40 Schlagwerkskörperteile 42, 43 on the one hand and 44 on the other hand made of different materials. To form a one-piece steel body 31 of the racket 30, a first striking mechanism body part 32 and a second striking mechanism body part 35 are joined to one another at a steel-fitting joint 37. When striker 40 is formed to form a one-piece steel body 41 each have a steel keyed joint 47 between a first Schlagwerkskörperteil 42 and a second Schlagwerkskörperteil 44 and a first Schlagwerkskörperteil 43 and the second Schlagwerkskörperteil 44. The steel-locking joint connection 37, 47 is presently formed by a multi-orbital friction-welded connection. As a result, the adjacent Schlagwerkskörperteile -32, 31, 35 in the racket 30 and 42, 44 and. 43, 44 in the firing pin 40- connected to each other in such a way that on the one hand independently of the joint cross section, a full-surface homogeneous composite arises and on the other hand, even difficult to weld materials can be interconnected. In the present case, the multi-orbital friction welding at the joining connections 37, 47 also permits the steel-locking joining of a manganese high-carbon steel as the first material of the first percussion body part 32 or 42, 43 and a case-hardening steel as second material of the second percussion body part 35, 44.

Even larger components can be connected by means of multi-orbital friction welding almost independently of a joining zone geometry in the region of the joint 37, 47 with comparatively low heat input. This leads to an additional favorable influence of the structural properties by plastic deformation during friction welding. In the present case, a first impactor body part 32, 42, 43 is made with a first material in the form of manganese-hard steel and thus has a particularly preferred combination of work hardening capacity and ductility. This results in the first Schlagwerkskörperteile 32, 42, 43 of the racket 30 and the firing pin 40, a superior strength and wear resistance coupled with a high degree of ductility, which is particularly useful for training particularly wear-resistant and impact resistant stop surfaces 32.1, 42.1 and 43.1 ,

A second striking mechanism body part 35, 44 in the racket 30 or firing pin 40 is in the present case formed from a case-hardening steel. In a modification not shown here - similar to Fig. 1 and Fig. 2 explains a second Schlagwerkskörperteil 35, 44 made of case-hardened steel to increase the toughness on the side surfaces 34.1, 44.1-especially in the area of notched by particular stress grooves 36, 46- annealed in a partial heat treatment or carburized to a small extent to the toughness in the mentioned areas.

Overall, a racket 30 according to the second embodiment of the Fig. 3 a still comparatively permanent change second impactor body part 35 with high density. Likewise, a racket 30 has a first striking mechanism body part 32 which is impact-resistant and wear-resistant with a comparatively low modulus of elasticity. This is analogous for the first Schlagwerkskörperteile 42, 43 and for the second Schlagwerkskörperteil 44 of the firing pin 40 of Fig. 4 to.

Claims (15)

Percussion body of an impact mechanism (100) of a hand tool (1000) having a side surface (14.1, 24.1, 34.1, 44.1) and an abutment surface (12.1, 13.1, 22.1, 23.1, 32.1, 42.1, 43.1), by means of which an impulse to a pulse-receiving part is transferable, where at least one first percussion body part (12, 13, 14, 22, 23, 24, 32, 42, 43) having the abutment surface and / or the side surface is formed from a first material and a second percussion body part (15, 25.1, 25.2, 35, 44) is formed of a second material, and wherein the first material is made more resistant in at least one material condition than the second material, characterized in that
the percussion body is formed as a one-piece steel body (11, 21, 31, 41), wherein (A) the first material and the second material is materially equal and the first material of the first percussion body part (12, 13, 14, 22, 23, 24) has a different heat treatment than the second material of the second percussion body part (15, 25.1, 25.2 )
or (B) the first and the second material are materially different and the first and the second impactor body part, in particular materially joined, and optionally wherein the first material of the first percussion body part (32, 42, 43) has a different heat treatment than the second material the second percussion body part (35, 44). Apparatus according to claim 1, characterized in that the at least one material composition is selected from the group consisting of: density, modulus of elasticity, toughness, wear resistance, strength. Device according to claim 1 or 2, characterized in that the other heat treatment of the first percussion body part (12, 13, 14, 22, 23, 24, 32, 42, 43) a heat treatment selected from the group consisting of tempering, carburizing, nitriding, nitrocarbonating or the like. diffusion-based heat treatments; or combinations thereof. Device according to one of claims 1 to 3, characterized in that the one-piece steel body (11, 21, 31, 41) at least two different first percussion body parts (12, 13, 14, 22, 23, 24, 32, 42, 43, 44) which have the other heat treatment, in particular each have a different heat treatment. Device according to one of claims 1 to 4, characterized in that the at least one first striking mechanism body part is processed by means of a method which is selected from the group consisting of: shot peening, plating, deep rolling or the like surface hardening process; or combinations thereof; Device according to one of claims 1 to 5, characterized in that the first material and / or the second material is a steel which is selected from the group consisting of: case hardened steel, tempered steel, tool steel, high carbon steel, in particular manganese high carbon steel. Device according to one of claims 1 to 6, characterized in that the cohesive joint connection is a steel-key joint connection (37, 47). Device according to one of claims 1 to 7, characterized in that the cohesive joint connection is a welded connection. Device according to one of claims 1 to 8, characterized in that a weld joint as a Reibschweiss-, in particular Rotationsreibschweiss-, Linearreibschweiss-, single or Mulitorbitalreibschweiss connection is formed. Device according to one of claims 1 to 6, characterized in that the cohesive joint connection is a solder joint. Device according to one of claims 1 to 6, characterized in that the cohesive joint connection is an adhesive connection. Striker body according to one of claims 1 to 11, characterized in that the abutment surface (12.1, 13.1, 22.1, 23.1, 32.1, 42.1, 43.1) has a planar head surface and / or the side surface (14.1, 24.1, 34.1, 44.1) comprises a waisted cross-sectional area. Impactor according to one of claims 1 to 12 in the form of a racket (10, 30) or a firing pin (20, 40). Striking mechanism (100) having a drive (A) which has an accelerating effect on at least one movable percussion body with a side face (14.1, 24.1, 34.1, 44.1) and a stop face (12.1, 13.1, 22.1, 23.1, 32.1, 42.1, 43.1), which is formed according to one of the preceding claims, wherein
a pulse of the percussion body is transferable to a pulse-receiving part, and wherein a first percussion body as a racket (10, 30) and / or a second percussion body as a firing pin (20, 40) is formed. Hand tool with a striking mechanism (100) according to claim 14.

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