EP0049404A1 - Procédé et dispositif pour le traitement par jet abrasif de pièces - Google Patents

Procédé et dispositif pour le traitement par jet abrasif de pièces Download PDF

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Publication number
EP0049404A1
EP0049404A1 EP81107402A EP81107402A EP0049404A1 EP 0049404 A1 EP0049404 A1 EP 0049404A1 EP 81107402 A EP81107402 A EP 81107402A EP 81107402 A EP81107402 A EP 81107402A EP 0049404 A1 EP0049404 A1 EP 0049404A1
Authority
EP
European Patent Office
Prior art keywords
blasting
workpieces
bed
drum
chamber
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.)
Granted
Application number
EP81107402A
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German (de)
English (en)
Other versions
EP0049404B2 (fr
EP0049404B1 (fr
Inventor
Peter Brenner
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.)
Georg Fischer AG
Original Assignee
Georg Fischer 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4324502&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0049404(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Georg Fischer AG filed Critical Georg Fischer AG
Priority to AT81107402T priority Critical patent/ATE11241T1/de
Publication of EP0049404A1 publication Critical patent/EP0049404A1/fr
Application granted granted Critical
Publication of EP0049404B1 publication Critical patent/EP0049404B1/fr
Publication of EP0049404B2 publication Critical patent/EP0049404B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
    • B24C3/26—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor
    • B24C3/266—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor for continuously travelling workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
    • B24C3/26—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor

Definitions

  • the invention relates to a method for the blasting treatment of workpieces, in particular of easily damaged, brittle "tempered and gray cast iron parts or cast grapes during the circulation of a bed consisting of workpieces and auxiliary bodies, and a device required to carry out the method.
  • EP-A1-0002 856 has disclosed a method of the type mentioned at the outset, in which workpieces of the same type in each case, such as, for example, hot-pressed brass parts or die-cast aluminum parts, together with auxiliary bodies such as, for example, porcelain balls or ceramic-bonded pyramid-shaped grinding wheels during a vibrating circulating movement, preferably with a blasting agent Glass beads from jet nozzles are jet treated.
  • auxiliary bodies also have the task of producing a grinding effect on the workpieces and / or of avoiding the workpieces colliding against one another during machining.
  • the auxiliary bodies used in this process do not guarantee damage-free blasting treatment of the workpiece types mentioned at the outset, and because of their size the auxiliary bodies can also get stuck in the cavities of the workpieces. In addition, they are too snierliohe separation of the auxiliary body from the workpieces, the abrasive particles and emitted by the blasting treatment expensive equipment and an additional circuit for the H ilfs Economics required.
  • the batch or continuous blasting machines known for drum-capable workpieces with a drum as the blasting space for example US Pat. No. 2,449,745, DE-PS 109,648 or EP-Al 000 3225
  • a belt trough as the blasting space for example GB-PS 1 362 525) or DE-OS 20 16 429
  • the drop height when circulating the smaller workpieces results in a high rejection rate due to breakage.
  • coalesces of cast grapes are formed during the circulation by mutual interlocking, which are not leave the centrifugal jet machines with sufficient blast treatment or cause malfunctions in the centrifugal jet machines due to insufficient transport.
  • the object of the present invention is to provide a method of the type mentioned at the beginning, by means of which brittle and easily hooked workpieces and cast grapes of different sizes and shapes, e.g. from annealed malleable cast iron without damage and without manual loading and unloading, it can be perfectly blasted on all sides.
  • the facility required for this is to enable an automatic mode of operation in batch operation or in a continuous process without great structural expenditure.
  • the use of the blasting agent as an auxiliary body ensures a gentle circulation without hitting each other without additional process steps being necessary for the separation of the auxiliary bodies from the workpieces after the blasting treatment.
  • Already placing the workpieces in an abrasive bed ensures that they are treated gently, even if the cast grapes are not mutually entangled even when they are circulated.
  • the blasting effect on the workpieces lying in the blasting agent bed corresponds to the requirements, that is, it is no worse than without a blasting agent bed or with overhead rail shot blasting machines. This can be explained by the fact that the blasting agent bed is partially blown away in the area of the blast jets, so that part of the workpiece surface is always exposed for the direct impact of the blast jets. It was also found that no higher beam powers are required compared to the previous methods.
  • the lining of the blasting chamber is subject to much less wear, which means that wear-free linings can be dispensed with or their service life is significantly increased.
  • the noise level caused by the circulation of the workpieces in the blasting chamber is significantly reduced.
  • a large range of workpieces can be blasted in the centrifugal jet machine at the same time, since the small, sensitive workpieces are no longer damaged or destroyed by the larger and heavier workpieces.
  • the circulating device 2 has a circumferential plate belt 13, which forms a belt recess 3.
  • the band trough 3 is laterally delimited by a rotating side window 14.
  • a sliding door 15, which closes a loading or unloading opening, is arranged on the front of the blasting chamber 1.
  • a cover 17 is attached to the sliding door 15, one side of which is covered by e.g. a rubber plate 18 is elastic and rests sealingly on the plate belt 13.
  • the cover 17 is provided with an opening 19 which can be closed completely or partially with a sliding cover plate 20, so that an adjustable passage for blasting media and -blasted particles is created.
  • a further cover 21 closes the intermediate space between plate belt 13 and chamber ceiling 22, so that a closed blasting chamber 23 is created.
  • the side windows 14 are provided with holes 24 which are arranged in a ring.
  • the largest diameter of the circular ring has a distance 25 from the surface of the band trough 3, which corresponds to the fill height of the filled fill 7 consisting of workpieces 8 and blasting agent 9.
  • the blasting medium 9 additionally supplied by the centrifugal wheel can then be discharged through the holes 24 acting as blasting medium overflow.
  • the plate belt 13 is provided with carrier webs 26, so that a good circulation of the bed 7 is achieved.
  • the height of the carrier webs is preferably approximately one third of the height of the bed 7.
  • the plate belt 13 is preferably only permeable to the sand blasted from the workpieces, which sand reaches a trough 28 between the individual hinged plates 27. It is also possible to arrange additional holes in the plate belt 13, but the permeability for blasting media must not be greater than the amount of blasting media supplied by the centrifugal wheel 6.
  • a screw conveyor 29 arranged in the trough 28 transports the mixture of abrasive and blasted particles therein - such as e.g. Sand - to an outlet opening 30, through which it comes to a further screw conveyor 31 and by means of this to a bucket elevator 32 of the conveyor device 10.
  • the bucket conveyor 32 conveys the mixture into the cleaning device 11, which is shown in simplified form and which, in a known manner, mixes the mixture e.g. separates into the individual components using magnetic drums and air classifiers.
  • the cleaned blasting agent 9 then passes into the container 12, from where it is fed to the centrifugal wheel 6 via a feed pipe 33 with a shut-off valve 34.
  • the workpiece feed device 4 has a displaceable and tiltable container 40 which is filled with the workpieces 8, for example by means of a conveyor belt 41.
  • Means of a feed pipe 42 having a shut-off valve 43, blasting agent 9 can be fed to the container 40 before the workpieces 8 are filled in, so that the workpieces 8 are introduced into a first blasting agent bed 16a.
  • the workpiece removal device 5 has a vibration trough 50 arranged below the loading and unloading opening of the blasting chamber 1 and a conveyor belt 51.
  • the bottom 52 of the vibrating trough is permeable at the end part 53 facing the conveyor belt 51 through the arrangement of holes 54 for blasting agent and blasted particles, which is then fed to the screw conveyor 31 through a funnel 55 arranged below the bottom 52.
  • Another feed tube 57 which starts from the container 12 and has a shut-off valve 56, opens into the vibrating trough 50, so that a blasting agent bed 16c can be created therein before the workpieces are unloaded.
  • a feed pipe 35 with a shut-off valve 36 leads directly from the container 12 into the blasting chamber 1, so that an abrasive bed 16b can also be created in the belt trough 3 before the workpieces are introduced.
  • the blasting chamber 1 and the container 40 are fed through the feed pipes 35 and 42, blasting agent 9, so that in each case a blasting agent bed 16a, 16b is formed in the belt trough 3 and in the container 40.
  • the workpieces 8 arriving via the conveyor belt 41 are then introduced into the container 40, the workpieces falling gently on the blasting agent bed 16a by moving the container 40 and a uniform bed 7 is formed.
  • This bed 7 is poured onto the blasting agent bed 16b by tilting the container 40 into the open blasting chamber 1, the one in the belt recess 3 and the one flowing along Blasting media 9 prevents the workpieces from hitting hard.
  • the blasting treatment takes place during the circulation of the bed 7. Due to the circulation, other parts of the workpiece come to the surface of the bed, so that a uniform blasting treatment of the workpieces is achieved, with a part of the blasting agent which is currently in the Workpieces lying around the blasting area are blown away by the centrifugal jets, so that a good blast utilization takes place despite the blasting agent bed.
  • blasting agent is fed through the feed pipe 57 into the vibrating trough, whereby a blasting agent bed 16c is formed directly below the discharge opening of the blasting chamber 1.
  • the container 40 is loaded with blasting agent and workpieces.
  • the sliding door 15 is opened and the bed 7 is gently conveyed out of the blasting chamber 1 into the vibrating trough 50 by reversing the direction of rotation of the plate belt 13.
  • the blasting agent and the blasted particles fall through the holes 54 into the funnel 55 and reach the screw conveyor 31 from where they are fed to the cleaning device 11 together with the blasting agents and blasted particles already deposited in the blasting chamber 1 by means of the conveying device 10 will.
  • the blasted workpieces 8 are then e.g. transported away from the conveyor belt 51.
  • the method according to the invention can also be carried out with a circulating device designed as a drum.
  • a circulating device designed as a drum.
  • the abrasive overflow is formed by rows of holes arranged on the circumference of the drum above the fill level.
  • the workpiece feed and workpiece removal device are designed as described, the filling being carried out by the drum open at the top and emptying either by a flap arranged on the floor or by tilting the entire drum.
  • FIGS. 2 to 8 Continuous centrifugal blasting machines are shown in FIGS. 2 to 8, in their blasting chamber 101 also a bed 107 consisting of blasting medium 109 and workpieces 108 is circulated.
  • FIG. 2 shows a continuous centrifugal blasting machine whose blasting chamber 101 is designed as a rotating drum 160 and has a discharge drum 161. At least one centrifugal wheel 106 and a workpiece feed device 104 designed as a conveyor belt or vibrating conveyor for loading the drum 160 with the workpieces 108 to be blasted are arranged on the input side 163 of the drum 160 provided with an inlet opening 162.
  • the blasting chamber 101 has a jacket 164 which is impermeable to the blasting medium 109 and is delimited at the outlet end by an annular retaining wall 165, to which the discharge drum 161 is connected.
  • this On its circumference, this has openings 159 for the passage of the blasting agent 109, the sand, and the blasted particles and is provided on the inside with a screw conveyor 166 which extends to the center and at the same time creates a labyrinth-like seal of the blasting chamber 101.
  • a screw conveyor 166 which extends to the center and at the same time creates a labyrinth-like seal of the blasting chamber 101.
  • the screw conveyor it can also be used lengthways and circumferentially sector-shaped sheets offset to one another.
  • the inside of the discharge drum 161 is preferably lined with rubber or plastic in order to protect the workpieces.
  • a trough 128 is arranged below the discharge drum 161, from where the abrasive and the blasted particles are fed by means of a conveying device 110 to an abrasive preparation system (not shown).
  • a workpiece removal device 105 is arranged next to the discharge drum 161 for the removal of the jet-treated workpieces 108.
  • the drum 160 which is impermeable to the blasting agent 109, in conjunction with a baffle wall 165 enables the formation of a blasting agent bed 116 consisting of the blasting agent 109, which bed is already present in the blasting chamber 101 before the first workpieces are introduced.
  • the baffle wall 165 advantageously has openings or holes 124 along the outside diameter of the discharge drum 161 arranged thereon, through which openings at least part of the blasting medium 109 additionally supplied by the centrifugal wheels 106 flows directly into the trough 128. This reduces the load on the discharge drum 161 with blasting agent and thus also its wear.
  • the workpieces 108 are introduced directly into the blasting agent bed 116 by means of the workpiece feed device 104, the drop height being very low due to the blasting agent bed 116 reaching as close as possible to the lowermost edge 167 of the inlet opening 162.
  • the drum 160 is driven continuously by known means, as a result of which the workpieces 108 and the abrasive bed 116 are circulated.
  • the height of the carrier webs 126 is preferably one third of the height of the blasting agent bed 116, with in most cases six carrier webs 126 evenly distributed on the inner circumference being sufficient.
  • the workpieces 108 are conveyed further in the direction of flow during the circulating movement in the abrasive medium bed 116 and are simultaneously blasted.
  • the lowermost edge 169 of the outlet opening 168 of the storage wall 165 should be lower than the lowermost edge 167 of the inlet opening 162.
  • the workpieces 108 are separated from the abrasive, sand and blasted particles and are forcibly conveyed to the workpiece removal device 105, by means of which they are fed for further treatment.
  • FIG. 3 and 4 show a drum 160 which has an annular channel 170 on the input side 163 on the circumference of the casing. Web plates 171 are arranged in the annular channel 170 and are provided with holes 172. When the drum is rotated, the abrasive 109 located in the annular channel 170 travels through the holes 172, so that in the lowest region of the annular channel 170 there is always a sufficiently high abrasive bed 116 for inserting the workpieces 108. (See Fig. 3)
  • the web plates 171 are either arranged parallel to the drum axis as shown in FIG. 3 or to achieve an additional conveying effect for the workpieces at an angle to the drum axis.
  • This arrangement of an annular channel 170 achieves particularly gentle input to the workpieces.
  • the discharge drum 161 is designed in this embodiment as a lattice drum with a jacket made of wire mesh.
  • Arranged in the blasting chamber 101 is an additional annular baffle wall 165a which, in cross section, instructs a U-shaped profile which is open to the outside and consists of two side walls 173 and an inner peripheral wall 174.
  • By making holes 175 on the front side wall and / or on the peripheral wall 174 part of the blasting medium 109 supplied and the blasted particles can be discharged outwards into the trough 128 here.
  • baffle walls designed in this way can also be arranged one behind the other. This ensures that the abrasive bed 116 is as uniformly high as possible in the longitudinal direction of the drum 160.
  • the blasting chamber 101 is thereby divided into a plurality of chambers, the sand already blasted in the front chamber or chambers being discharged through the U-shaped baffle walls 165a at the end of the respective chamber.
  • the actual blasting is then carried out in the subsequent chamber or chambers in a blasting agent bed which is essentially free of sand or blasted particles.
  • drums 160 of polygonal cross-section the preferably six circumferential sides 180 being bent symmetrically inwards toward the center of the drum.
  • Driving webs 126 which need only have a small height, are arranged on a kink edge 181 of each circumferential side 180.
  • This drum design ensures good circulation of the workpieces 108 in the abrasive bed 116, and despite the one-sided entrainment of the abrasive bed, there is always a sufficiently high abrasive bed 116 in the respective lower drum area for the gentle circulation and introduction of the workpieces.
  • the abrasive can be because of low carrier webs 126 flow well downwards, but the workpieces 108 are nevertheless held so long that the abrasive and the sand can flow out of the cavities of the workpieces.
  • FIG. 7 and 8 show a continuous centrifugal blasting machine whose blasting chamber 101 is designed as a belt trough 103.
  • This embodiment offers the advantage of arranging a plurality of centrifugal wheels 106 radiating in different directions.
  • a feed drum 190 is arranged in front of the belt trough 103 and a discharge drum 191 with the discharge drum 161 is arranged behind the belt trough.
  • the discharge drum 161 can be designed differently as described for the embodiment variants of FIGS. 2 and 3.
  • baffle walls 165a On both sides of the belt trough 103 there are baffle walls 165a, which are preferably U-shaped as described in relation to FIG. 3.
  • a storage wall 165 is also arranged between the discharge drum 191 and the discharge drum 161, as a result of which the abrasive bed 116 extends from the inlet opening 162 to the beginning of the discharge drum 161.
  • the belt trough 103 consists of individual plates 127, the space between the individual plates 127 being so small that the amount of blasting agent flowing out there is smaller than the amount of blasting agent supplied by the centrifugal wheels 106.
  • the two drums 190, 191 are also impermeable to the blasting medium.
  • centrifugal jets extend into the feed drum 190 and the discharge drum 191, they form chambers of the blasting chamber 101 with a continuous blasting agent bed 116 which are separated by the baffle walls 165a.
  • This embodiment thus also has the advantages described for FIG. 2.
  • the input of the workpieces 108, their removal and the removal of the blasting agent with the blasted particles correspond to the design variants described above.
  • the plates 127 of the belt trough 103 and the two drums 190 and 191 are preferably provided with driving webs 126 for circulating the blasting agent bed 116 and the workpieces 108.
  • the axial passage of the workpieces 108 through this centrifugal jet machine is determined by their inclined arrangement and / or by arrangement of conveying means such as e.g. Snail threads reached.
  • the process for blasting brittle or easily damaged workpieces in an abrasive bed can also be carried out in other suitable continuous centrifugal blasting machines such as, for example, continuous swiveling drum machines.
  • blasting chambers arranged one behind the other, designed as drums or belt troughs, a blasting agent bed being kept constant in each blasting chamber and in the feed and discharge drums arranged therebetween.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP81107402A 1980-10-03 1981-09-18 Procédé et dispositif pour le traitement par jet abrasif de pièces Expired - Lifetime EP0049404B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81107402T ATE11241T1 (de) 1980-10-03 1981-09-18 Verfahren und einrichtung zum strahlbehandeln von werkstuecken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7397/80A CH648504A5 (de) 1980-10-03 1980-10-03 Verfahren und einrichtung zum strahlbehandeln von werkstuecken.
CH7397/80 1980-10-03

Publications (3)

Publication Number Publication Date
EP0049404A1 true EP0049404A1 (fr) 1982-04-14
EP0049404B1 EP0049404B1 (fr) 1985-01-16
EP0049404B2 EP0049404B2 (fr) 1990-02-21

Family

ID=4324502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107402A Expired - Lifetime EP0049404B2 (fr) 1980-10-03 1981-09-18 Procédé et dispositif pour le traitement par jet abrasif de pièces

Country Status (4)

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EP (1) EP0049404B2 (fr)
AT (1) ATE11241T1 (fr)
CH (1) CH648504A5 (fr)
DE (1) DE3168331D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5531263A (en) * 1993-10-08 1996-07-02 Sintokogio, Ltd. Oscillating trough for shot blast
EP1172177A1 (fr) * 2000-07-13 2002-01-16 Sumitomo Special Metals Co., Ltd. Appareil pour le traitement de surface par voie sèche et procédé de traitement de surface par voie sèche à l'aide d'un tel appareil
CN107772658A (zh) * 2017-12-06 2018-03-09 东莞市详松自动化科技有限公司 一种鞋底自动打粗机及打粗工艺
EP3718692A1 (fr) * 2019-04-03 2020-10-07 Rösler Holding GmbH & Co. KG Dispositif et procédé de finition de composants
SE2150418A1 (en) * 2021-04-01 2022-10-02 Am Efficiency Nordic Ab Blast cabinet

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111113279A (zh) * 2019-12-20 2020-05-08 唐山宏通玛钢有限公司 一种玛钢管件抛丸机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2357599A (en) * 1942-10-31 1944-09-05 Joseph M Schatz Sandblasting device
GB1254442A (en) * 1968-06-12 1971-11-24 Internat Technical Services Lt Method of, and apparatus for, treating workpieces
EP0038455A1 (fr) * 1980-04-18 1981-10-28 SCHLICK-Roto-Jet Maschinenbau GmbH Procédé et dispositif pour traiter les surfaces de pièces d'usinage par des particules abrasives

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2357599A (en) * 1942-10-31 1944-09-05 Joseph M Schatz Sandblasting device
GB1254442A (en) * 1968-06-12 1971-11-24 Internat Technical Services Lt Method of, and apparatus for, treating workpieces
EP0038455A1 (fr) * 1980-04-18 1981-10-28 SCHLICK-Roto-Jet Maschinenbau GmbH Procédé et dispositif pour traiter les surfaces de pièces d'usinage par des particules abrasives

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5531263A (en) * 1993-10-08 1996-07-02 Sintokogio, Ltd. Oscillating trough for shot blast
CN1068272C (zh) * 1993-10-08 2001-07-11 新东工业株式会社 喷丸用的摆动槽
EP1172177A1 (fr) * 2000-07-13 2002-01-16 Sumitomo Special Metals Co., Ltd. Appareil pour le traitement de surface par voie sèche et procédé de traitement de surface par voie sèche à l'aide d'un tel appareil
US7056197B2 (en) 2000-07-13 2006-06-06 Neomax Co. Ltd. Dry surface treating apparatus and dry surface treating method using the same apparatus
CN107772658A (zh) * 2017-12-06 2018-03-09 东莞市详松自动化科技有限公司 一种鞋底自动打粗机及打粗工艺
EP3718692A1 (fr) * 2019-04-03 2020-10-07 Rösler Holding GmbH & Co. KG Dispositif et procédé de finition de composants
SE2150418A1 (en) * 2021-04-01 2022-10-02 Am Efficiency Nordic Ab Blast cabinet
SE545087C2 (en) * 2021-04-01 2023-03-28 Am Efficiency Nordic Ab Blast cabinet

Also Published As

Publication number Publication date
EP0049404B2 (fr) 1990-02-21
CH648504A5 (de) 1985-03-29
DE3168331D1 (en) 1985-02-28
ATE11241T1 (de) 1985-02-15
EP0049404B1 (fr) 1985-01-16

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