EP2514569B1 - Machine-outil manuelle et procédé de fabrication - Google Patents

Machine-outil manuelle et procédé de fabrication Download PDF

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Publication number
EP2514569B1
EP2514569B1 EP12157423.0A EP12157423A EP2514569B1 EP 2514569 B1 EP2514569 B1 EP 2514569B1 EP 12157423 A EP12157423 A EP 12157423A EP 2514569 B1 EP2514569 B1 EP 2514569B1
Authority
EP
European Patent Office
Prior art keywords
tube
guide tube
metal strip
piston
openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12157423.0A
Other languages
German (de)
English (en)
Other versions
EP2514569A1 (fr
Inventor
Josef Fünfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP2514569A1 publication Critical patent/EP2514569A1/fr
Application granted granted Critical
Publication of EP2514569B1 publication Critical patent/EP2514569B1/fr
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0815—Making tubes with welded or soldered seams without continuous longitudinal movement of the sheet during the bending operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/156—Making tubes with wall irregularities
    • B21C37/157—Perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/30—Finishing tubes, e.g. sizing, burnishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—Guide-sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/065—Details regarding assembling of the tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • the present invention relates to a hand tool, in particular a hand tool with a motor-driven pneumatic percussion, as shown in DE 19713154 A1 known.
  • the invention further relates to a manufacturing method of the power tool.
  • the Schlagwerk has a pot-shaped pathogen, within which a racket is arranged and guided.
  • the racket closes with the pot-shaped pathogen from a pneumatic chamber which forms the air spring for coupling the movement of the pathogen to the racket
  • the pathogen is suspended in a tubular guide in which the exciter driven by the motor is pushed back and forth.
  • the guide can be a welded pipe.
  • percussion piston in a guide tube is periodically accelerated by an air spring and strikes a tool at a forward inflection point.
  • the principle of the air spring requires an airtight guidance of the percussion piston in the guide tube. Due to the high mechanical load caused by the setbacks or the thermomechanical loads, the hammer mechanism should not heat up to over 100 degrees Celsius. Furthermore, the percussion piston must move smoothly in the guide tube in order not to suppress the relatively weak coupling of the motor drive via the air spring.
  • the guide tube is therefore made by machining from a solid cylinder or a tube with a smaller inner diameter to ensure the mechanical and thermo-mechanical properties.
  • the pneumatic impact mechanism requires ventilation openings in the guide tube whose diameters are predetermined with small tolerances.
  • the openings are drilled in the guide tube.
  • the sharp edges created on the inside must be deburred and honed so as not to injure seals on the percussion piston. Due to the difficult access to the inside, the deburring and hoisting takes place mechanically and chemically with great effort.
  • the manufacturing method according to the invention according to claim 6 allows insertion of the openings in the guide tube, without nameable post-processing steps such as hoisting, deburring, etc.
  • the manufacturing method provides to introduce holes in a metal strip, cold forming the metal strip into a guide tube and longitudinal edges of the metal strip by a seam Materialschlüsslg to connect and / or by a To connect toothing form fit. Subsequently, a piston-shaped racket is inserted into the guide tube.
  • the inventive method represents a departure from the prejudice, the guide tube must be made from a solid body machined.
  • a punch can be placed on a first side of the sheet metal strip to punch the holes.
  • the first side is reshaped to an inside of the tube.
  • the punch on the first page granted in a simple way a rounded hole edge.
  • a recess can be formed around a hole, the so-called indentation, which is often undesirable and therefore suppressed by suitable measures. It has been recognized that the indentation can be advantageous for this application, because without further processing steps, a hole edge can be produced without sharp edges.
  • One embodiment provides that the tube closed with a seam is pulled over a calibration piston whose circumference is between 0.5% and 2% greater than a width of previously bent sheet-metal strip.
  • the circumference of the bent tube is preferably slightly less than the required diameter for the final guide tube.
  • the calibration piston leads to a radial expansion of the tube, which in addition to an adaptation to a circular shape and required diameter, causes a stiffening of the tube by the stretching of the material.
  • the hand tool according to the invention according to claim 1 has a pneumatic percussion.
  • the striking mechanism comprises a motor-driven exciter, a guide tube and a piston-shaped racket.
  • the piston-shaped racket is guided through an inner side of the guide tube and closes in the guide tube with the exciter from an air spring.
  • the exciter may also be piston-shaped and guided in the guide tube adjacent to the inside thereof.
  • Another embodiment provides a pot-shaped pathogen, i. the guide tube is rigidly connected to the exciter.
  • the racket moves in the tubular section of the exciter, which is formed by the guide tube.
  • the guide tube is formed from a sheet metal strip bent into a tube. Two opposite longitudinal edges of the metal strip are connected by a seam and a positive connection in the circumferential direction.
  • the seam can be helically wound around the working axis. It shows here an increased dimensional stability of the guide tube.
  • Fig. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool .
  • the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, for example one of the drill bit 4, can be used.
  • a primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7 .
  • a user can guide the hammer drill 1 by means of a handle 8 and take means of a system switch 9, the hammer drill 1 is in operation.
  • the hammer drill 1 rotates the drill bit 4 continuously about a working axis 10 and can beat the drill bit 4 in the direction of impact 11 along the working axis 10 in a substrate.
  • the percussion 6 is a pneumatic percussion 6.
  • An exciter 12 and a racket 13 are guided in the percussion 6 along the working axis 10 movable.
  • the exciter 12 is coupled via an eccentric 14 or a wobble finger to the motor 5 and to a periodic, linear motion forced.
  • An air spring formed by a pneumatic chamber 15 between exciter 12 and racket 13 couples a movement of the racket 13 to the movement of the exciter 12 at.
  • the racket 13 can strike directly on a rear end of the drill bit 4 or indirectly transfer part of its momentum to the drill bit 4 via a substantially resting intermediate racket 16 (striker).
  • the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 17 .
  • the exemplary exciter 12 is designed as a piston which is moved back and forth in the cylindrical guide tube 20 .
  • the racket 13 is also designed as a piston. Both the exciter 12 and the racket 13 close with their radial outer surfaces airtight with an inner surface 21 of the guide tube 20 from.
  • the guide tube 20 may extend to a bearing block 22 for the intermediate beater 16 .
  • the guide tube 20 has a plurality of radial to the working axis 10 openings. First of the openings 23 allow an adiabatic pressure equalization of the air spring in a warming device. Second of the openings 24 aerate the pneumatic chamber 15 and deactivate the air spring as soon as the impact mechanism 6 beats empty.
  • the guide tube 20 is made of a bent sheet metal strip 25 which is closed with a weld 26 along the working axis 10 ( Fig. 2 ).
  • the openings 23, 24 are punched, for example, in the metal strip 25 .
  • One of the inner side 21 of the guide tube 20 is preferably a stamping insert 27 (FIG. Figure 3 ).
  • the funnel-shaped widening of the opening 23, 24, which can occur during punching, leads to a gentle hole edge. Normally one tries to avoid punching during the punching, with this special application a badly cutting punching tool is to be preferred.
  • the punching tool is preferably applied to the side of the sheet metal strip 25 , which later becomes the inner side 21 of the guide tube 20 .
  • the openings can also be drilled, a countersink or a deburring blade can produce a funnel-shaped widening analogous to the stamping 27 .
  • a starting point for the production of a guide tube 20 may be a metallic endless belt 30 ( Fig. 4 ).
  • a width 31 of the endless belt 30 is about 0.5% to 2% smaller than a circumference of the guide tube 20 to be produced.
  • Preferred materials of the endless belt 30 are soft, low carbon steels such as spring steels, eg having a carbon content of less than 1 wt. -%.
  • the endless belt 30 is fed to a punch 40 , which punches holes 41 in the endless belt 30 .
  • the punch 40 pushes a punch 42 or a plurality of punches from the first side 43 of the endless belt 30 to an opposite second side 44 .
  • a punching 45 is on the first side 43.
  • the punching 45 is an approximately funnel-shaped depression in the material of the endless belt 30, which is formed when pushing the punch 42 .
  • a first series of first holes 41 having a first diameter and a second row of second holes 46 having a second diameter are punched alternately.
  • the holes 41, 46 of a row are arranged substantially on a line transverse to the longitudinal direction of the endless belt 30 .
  • the first diameter is greater than 3 mm, for example greater than 5 mm, and up to 15 mm in size, for example up to 10 mm in size. For example, between 4 and 10 holes may be arranged in the first row.
  • the second diameter is much smaller, eg less than 1 mm. Furthermore, preferably only one or two second holes 46 are provided in the second row.
  • a forming device 50 with a plurality of rollers 51 rolls the endless belt 30 in several stages to an endless tube 52.
  • the first page 43 with the punching 45 comes to lie on the inside of the tube 52 to lie.
  • the opposed to the forming edges 53 of the endless belt 30 are welded together.
  • the welding can be done for example by induction.
  • a corresponding welding probe 54 may be held in the area in which the two edges 53 begin to touch.
  • a seam 55 which connects the two edges 53 material fit and airtight forms.
  • the endless tube 52 is cut to individual guide tubes 20 by a cutter 60 .
  • the guide tube 20 is pushed one or more times over a calibration cylinder 70 or calibration cone and thereby widened to the desired extent.
  • the circumference of the calibration cylinder 70 is preferably perfectly circular and slightly larger than the inner circumference of the endless tube. Subsequently, the excitation piston 12 and the percussion piston 13 are inserted into the guide tube 20 .
  • Another production method begins with an endless belt 80, the width of which, for example, corresponds approximately to the length of the guide tube 20 ( Fig. 6 ).
  • Parallel to the edges 81 of the endless belt 80 two rows of holes 41, 46 are punched.
  • the properties of the first holes 41 and the second holes 46 are set equal to the previous manufacturing method.
  • the punching 45 is for all holes 41, 46 on a first side 82 of the endless belt 80th
  • a cutter 90 breaks the endless belt 80 into sheet metal strips 91.
  • the sheet metal strips 91 may be in the form of a non-rectangular parallelogram.
  • the longer edges 92 may be inclined to the shorter edges 94 at an angle 93 of less than 90 degrees, eg, between 45 degrees and 80 degrees.
  • the length 95 of the shorter edges 94 is less than the circumference of the guide tube 20 to be produced, preferably between 0.5% to 2%.
  • a roll bender 100 rolls the sheet metal strip 91 to a tube 101 (FIG. Fig. 7 ).
  • the roll bending device 100 has, for example, two parallel guide rollers 102, 103 on which the sheet metal strip 91 rests with the second side.
  • An upper roller 104 is disposed along a feed direction 105 between the guide rollers 102, 103 and presses the first side 106 of the sheet metal strip 91 toward the two guide rollers 102, 103.
  • the engagement of the upper roller 104 between the two guide rollers 102, 103 is the required radius of curvature or diameter of the guide tube 20 adjusted accordingly.
  • the sheet metal strip 91 is inserted with the shorter edges 94 parallel to the intake device 105 in the roll bending device 100 .
  • the preferably oblique, longer edges 92 touch after bending.
  • the longer edges 92 are connected by a seam 107 , for example, welded or glued ( Fig. 8 ).
  • the seam 107 may be spiral.
  • the circumference of the bent tube is trimmed by the calibration cylinder 70 (cf. Fig. 5 ).
  • the metal strips 91 can be provided with a first toothing 108 on one of the longer edges 94 and a second toothing 109 on the other of the longer edges 94 .
  • the gears 108, 109 may be punched in the sheet metal strips 91 , or may be generated by the cutting device 90 during separation.
  • the first toothing 108 is formed in a form-fitting manner to the second toothing 109 .
  • the teeth 110 widen toward the edge.
  • a gearing may be related to FIG. 4 be stamped or embossed in the edges 53 described method.
  • the ventilation holes can be drilled into the sheet by means of a drill before it is bent to the pipe.
  • the drill is attached to the side of the sheet, which is bent to the inside of the tube.
  • a deburring drill or countersink can round off the edge of the hole.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
  • Drilling And Boring (AREA)

Claims (9)

  1. Machine-outil manuelle ayant un mécanisme de percussion pneumatique (6) qui comporte un excitateur entraîné par moteur (12), un tube de guidage (20) et un percuteur en forme de piston (13), dans laquelle le percuteur en forme de piston (13) est guidé à travers un côté intérieur (21) du tube de guidage (20) et enferme, avec l'excitateur (12), un ressort pneumatique (15) dans le tube de guidage (20), caractérisée en ce que le tube de guidage (20) est formé à partir d'une bande de tôle (30, 91) pliée pour former un tube, dont deux bords longitudinaux opposés (53, 92) sont assemblés par un cordon (55, 107) et/ou par fixation par complémentarité de formes dentées (108, 109).
  2. Machine-outil manuelle selon la revendication 1, caractérisée en ce que le cordon est enroulé autour de l'axe de travail de manière hélicoïdale.
  3. Machine-outil manuelle selon la revendication 1 ou 2, caractérisée en ce que des ouvertures de ventilation (23, 24) du tube de guidage (20) sont poinçonnées.
  4. Machine-outil manuelle selon la revendication 3, caractérisée en ce qu'il y a un évasement (27) des ouvertures de ventilation poinçonnées (23, 24) au niveau du côté intérieur (21) du tube de guidage (20).
  5. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que des premières ouvertures (24) ont un premier diamètre et des secondes ouvertures (23) ont un second diamètre plus grand que le premier diamètre, dans laquelle les secondes ouvertures (23) sont agencées de manière décalée par rapport aux premières ouvertures (24) dans une direction de percussion (11) du mécanisme de percussion pneumatique (6).
  6. Procédé de fabrication d'une machine-outil manuelle comportant les étapes consistant à :
    créer des trous (41, 46) dans une bande de tôle (30, 91),
    mettre les bandes de tôles (30, 91) en forme de tube,
    assembler des bords longitudinaux (53, 92) de la bande de tôle mise en forme (30, 91) par un cordon (55, 107) et/ou fixation par complémentarité de formes dentées (108, 109) et
    introduire un percuteur en forme de piston (13) dans le tube (20) fermé de manière circonférentielle par le cordon (55, 107) et/ou fixation par complémentarité de formes dentées (108, 109),
    dans lequel le percuteur en forme de piston (13) est en contact sur le côté intérieur (21) du tube (20).
  7. Procédé de fabrication selon la revendication 6, caractérisé en ce qu'un poinçon d'estampage est appliqué sur un premier côté (43, 82) de la bande de tôle (30, 91) afin de poinçonner les trous (41, 46) dans les bandes de tôles (30, 91), et le premier côté (43, 82) est façonné pour former un côté intérieur (21) du tube (20).
  8. Procédé de fabrication selon la revendication 6 ou 7, caractérisé en ce que les bords longitudinaux (53, 92) sont soudés l'un à l'autre.
  9. Procédé de fabrication selon l'une des revendications 6 à 8, caractérisé en ce que le tube (20) fermé avec le cordon (55, 107) est tiré au-dessus d'un piston de calibrage (70) dont la circonférence est entre 0,5 % et 2 % plus grande qu'une largeur (31, 95) de la bande de tôle (30, 91).
EP12157423.0A 2011-04-19 2012-02-29 Machine-outil manuelle et procédé de fabrication Active EP2514569B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011007660A DE102011007660A1 (de) 2011-04-19 2011-04-19 Handwerkzeugmaschine und Herstellungsverfahren

Publications (2)

Publication Number Publication Date
EP2514569A1 EP2514569A1 (fr) 2012-10-24
EP2514569B1 true EP2514569B1 (fr) 2015-06-17

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ID=45833145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12157423.0A Active EP2514569B1 (fr) 2011-04-19 2012-02-29 Machine-outil manuelle et procédé de fabrication

Country Status (5)

Country Link
US (1) US9969072B2 (fr)
EP (1) EP2514569B1 (fr)
CN (1) CN102744713B (fr)
DE (1) DE102011007660A1 (fr)
ES (1) ES2546070T3 (fr)

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US10081081B2 (en) 2015-06-16 2018-09-25 Flex-N-Gate Advanced Product Development Llc Method of manufacturing a welded tubular section using in-line notching and trimming initiated after roll-forming and welding
DE102016204498A1 (de) * 2016-03-18 2017-09-21 Robert Bosch Gmbh Lagervorrichtung
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US20120267138A1 (en) 2012-10-25
EP2514569A1 (fr) 2012-10-24
CN102744713A (zh) 2012-10-24
US9969072B2 (en) 2018-05-15
ES2546070T3 (es) 2015-09-18
CN102744713B (zh) 2016-09-28
DE102011007660A1 (de) 2012-10-25

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