EP0255876A2 - Dispositif d'insufflation pour une machine à tirer les noyaux - Google Patents

Dispositif d'insufflation pour une machine à tirer les noyaux Download PDF

Info

Publication number: EP0255876A2
Authority: EP; European Patent Office
Prior art keywords: shooting; shooting head; tube; guide insert; head
Prior art date: 1986-08-08
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

EP87109856A

Other languages

German (de)

English (en)

Other versions

EP0255876B1 (fr

EP0255876A3 (en

Inventor

Joachim Dipl.-Ing. Laempe

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.)

Individual

Original Assignee

Individual

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.)

1986-08-08

Filing date

1987-07-08

Publication date

1988-02-17

1987-07-08 Application filed by Individual filed Critical Individual

1987-07-08 Priority to AT87109856T priority Critical patent/ATE48959T1/de

1988-02-17 Publication of EP0255876A2 publication Critical patent/EP0255876A2/fr

1988-05-25 Publication of EP0255876A3 publication Critical patent/EP0255876A3/de

1989-12-27 Application granted granted Critical

1989-12-27 Publication of EP0255876B1 publication Critical patent/EP0255876B1/fr

Status Expired legal-status Critical Current

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Images

Classifications

- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
- B22C15/26—Compacting by gas pressure or vacuum involving propulsion devices in which the mould material is supplied in the shape of a compacted column or the like
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C13/00—Moulding machines for making moulds or cores of particular shapes
- B22C13/12—Moulding machines for making moulds or cores of particular shapes for cores

Definitions

the invention relates to a device for injecting core sand by means of compressed air in core boxes on a core shooting machine, with a shooting head, with a shooting plate releasably attachable between the shooting head and the core box on the shooting head and with a shooting tube leading to the shooting head within a casing tube, which has one end at its shooting head end arranged stop, which is supported against the shooting head on a contact surface against the direction of the shooting force, the shooting head being releasably attached to the tubular casing.
the contact surface for the support of the shooting tube is usually arranged in the one-piece shooting head.
the shooting tube is attached to the contact surface between the base of the casing tube and the contact surface of the shooting head.
This connection is usually a pressure screw connection.
the foot of the casing tube which is between itself and the shooting head contact surface fixed the pipe stop, overlapped by an annular flange of the shooting head that tapers conically in the opposite direction to the shooting direction, screw elements turned vertically to the conical plane through the flange act on the suitably shaped foot of the casing tube and thereby press in the direction of the contact surface of the shooting head or the pipe flange.
the daily cleaning of the shooting tube can only be carried out if the shooting head has been detached from the casing tube beforehand.
the disadvantage here is that the pressure screws are worn out by the frequency of the change. This also affects the centering of the casing tube due to the pressure screws, which also act in the coaxial direction. This effect is exacerbated by the wear of the centering ring located at the foot of the casing tube.
the axially acting contact surface for the shooting tube is formed exclusively by a sand guide insert held in the position of use on its side opposite the contact surface by the shooting plate after the loosening of the shooting plate in the shooting direction from a shooting head jacket of the shooting head.
the shooting plate is removed from the shooting head, the sand guiding insert and thus the part which determines the firing channel in the shooting head can be replaced practically at the same time without the shooting head having to be detached from the tubular jacket.
the shooting tube which is originally resting on the contact surface of the sand guiding insert, can now be pulled out of the jacket in the shooting direction.
the advantages in terms of simplicity and speed, both in adapting the firing channels to different firing plates and in cleaning the firing barrel are obvious. Since the connection between the actual shooting head and the casing tube no longer has to be released, there is no wear on the connecting elements between the shooting head and tube jacket by itself. The optimal centering of the tube jacket is thus maintained regardless of the type and number of changes in the firing channel or the cleaning of the firing tube.
the advantages achieved are achieved constructively by dividing the originally one-piece shooting head into two parts.
the shooting head now breaks down constructively into a shooting head jacket connected to the tubular jacket and the sand guide insert containing the firing channel.
the device according to the invention can be further simplified in that the shooting head has a recess which is open towards the shooting plate and into which the sand guide insert, in particular flush with the contact surfaces of the shooting head, fits on the shooting plate. Due to the flush fit of the contact surfaces and the surface of the sand guide insert facing the shooting head plate, the same shooting head plates can be used that already worked with the previous one-piece shooting head. Because in the operating state, with inserted sand guide insert, there is still a flat surface on the shooting head plate side, the only difference to the previous shooting head surface is that it is interrupted in a very small area in the transition from sand guide insert to the shooting head jacket. Sealing problems between the shooting head jacket or sand guide insert and the shooting plate do not occur even when using old shooting plates.
the preferably cylindrical recess of the shooting head expediently has a bottom on the side facing away from the shooting plate as an annular contact surface for the sand guiding insert, which is approximately the edge region of a sand guiding opening through the sand leadership insert and against which the axially supported on the sand guide insert vzw. designed as a mounting flange stop of the shooting tube can be pressed in the use position, so that the mounting flange is in the use position between the sand guide insert and the bottom of the shooting head recess.
the sand guide insert does not need independent fastening elements for its connection to the shooting head or the shooting head plate.
the shooting head plate when the shooting head plate is fastened, it acts on the fastening flange of the shooting tube and thus supports it axially against the annular contact surface.
the sand guide insert and the shooting tube can be pulled out in the sandblasting direction after dismantling the shooting head plate.
the ring-shaped contact surface, the outer surfaces of the shooting tube flange and the contact surface on the shooting head shell side of the sand guide insert are advantageously matched to one another, so that they pressurize the sand guide insert in the opposite direction to close the transition from the shooting tube to the firing channel of the sand guide insert by pressurizing the sand guide insert.
these casing pipes are conically widened on the outside at their shooting head-side foot in order to form contact surfaces for the above-mentioned pressure screw loading. It therefore proves to be advantageous the contact surface of the sand guiding insert in the shooting head of a vorzugswei se to define the shooting head outside conically widened edge of a casing tube of the core shooter.
the shooting head jacket surrounds the base of the shooting tube jacket and the axial circumferential surfaces of the sand guiding insert in a ring shape. It is thus attached to the tubular casing in the same way as the shooting heads of the traditional type.
the shooting tube is held here with its flange between the contact surface of the base of the tubular casing and the connection surface of the sand guiding insert.
the inner contact surface for the sand guide insert or for clamping the fastening flange of the shooting tube between the shooting head and the insert is itself formed by a bottom region of the shooting head facing away from the shooting plate, on the outside of which a casing tube of the core shooting machine can be placed and fastened , wherein this bottom or the like. of the shooting head has a passage opening for the shooting tube.
the shooting head is designed to be integrated, so that the tubular casing no longer has to be designed as a contact surface or abutment for the sand guiding insert or the shooting tube flange.
fastening elements preferably screws
the shooting head is now accessible in the axial direction from the opening on the sand exit - even without any perforation in the shooting channel walls - after removing the sand guide insert, the shooting head jacket and tubular jacket can be connected to each other by an axial connecting element from the shooting head-side contact surface.
the interchangeable sand guide insert is suitably made of plastic.
Plastic is particularly suitable here because it ensures an axial elasticity of the sand guiding insert in the sandblasting direction and therefore ensures a good seal of the contact surface in a further axial length tolerance range of the sand guiding insert even in the event of unevenness in the mating surfaces caused by production or operation.
Another significant advantage of the plastic version is the weight saving, which makes changing the sand guide insert much easier with each change of the shooting head plate and thereby accelerating it.
the production of a plastic sand guide insert is simple and inexpensive.
the shoot-in device according to the invention can, in particular, be decisively improved and he be added that a releasable adhesive connection is provided for connecting the shooting head to the shooting plate and thus for fixing the sand guiding insert.
An adhesive connection has the advantage that it does not require any rigid connecting elements held with abutments and, depending on its design, can enable it to be released and connected more quickly.
Such a quick and uncomplicated type of releasable adhesive connection is achieved in that a vacuum clamping connection is provided between an outer fastening flange surrounding the recess for the sand guide insert and the corresponding contact area of the firing plate.
At least one preferably flat annular groove or similar recess can run around the fastening flange of the shooting head, the edges of which are surrounded by seals which project in particular from the surface of the fastening flange, and that the recess (s) located on the fastening flange has a connection to a vacuum shaft, in particular to a vacuum pump.
a ring-shaped enclosed air-thinned space between the shooting head plate and the shooting head jacket can be created during operation of the vacuum pump.
the ring surface enclosed in this way is more expedient How to design in size, that given the quality of the vacuum, a firm adhesion of the shooting head plate and a sufficient contact pressure of the shooting head plate on the sand guide insert are guaranteed.
a magnetic connection can also be provided between the shooting head and the shooting plate.
at least one electro-magnet is expediently let in on the fastening flange of the shooting head outside the recess for the sand guiding insert, the shooting plate being made of ferromagnetic material.
a shooting device of a core shooting machine consists of a shooting pipe 2 and a jacket pipe 3 surrounding it, which is surrounded in its foot region by a shooting head jacket 4, which surrounds the sand guiding insert 5 on its circumference.
the shooting device 1 is delimited at its sandblast outlet end by the shooting plate 6, which is attached to the shooting head jacket 4 of a shooting head 15.
the axial contact surface 7 of the sand guiding insert which acts axially against the sandblasting direction on the mounting flange 7 of the shooting tube 2, is designed as a circular, flat surface which lies closely against the counter surface 9 of the flange 7 and seals the transition 10 between the shooting tube 2 and the firing channel 11 in the sand guiding insert 5 .
each firing plate 6 has a specific, suitable firing channel, so that the replacement of the firing head plate also requires the replacement of the sand guiding insert 5.
the sand guide insert 5 can be removed from the shooting head jacket 4 after the shooting head plate 6 has been removed.
the shooting head jacket has an open to the shooting plate 6 recess into which the sand guide insert 5, in the embodiment bün dig, with the contact surfaces 12 of the shooting head shell 4 on the shooting head plate 6 fits. Due to the flush fit of the contact surfaces of the sand guide insert 5 and the shooting head shell 4 on the shooting head plate counter surface 13, after fastening the shooting head plate 6 to the shooting head jacket 4, a good sealing of the firing channel transition between sand guide insert 5 and shooting head plate 6 is obtained.
the recess in the shooting head jacket 4 and the matching sand guide insert 5 are cylindrical in the exemplary embodiment, the cylinder axis coinciding with the sandblasting axis running centrally in the injection tube.
the recess in the shooting head jacket 4 represents a continuous cylindrical bore, so that the sand guide insert 5 supports the pipe flange 7 with a contact surface 8 against a contact surface 3 a of the pipe jacket 3.
the flange 7 is therefore not supported in the shooting head 15 consisting of the shooting head jacket 4 and the sand guide insert 5, but, as is clearly visible in FIG. 1, directly on the tubular jacket 3.
the embodiment shown here allows the shooting device according to the invention to be attached to old-style pipe jackets. This is because the pressure screw fastening mechanism, in which pressure screws 17, which are directed toward an externally conically widened edge 16 of the base of the casing tube 3, connect the shooting head 15 to the casing tube 3, can be used here for fastening purposes.
the improvement of existing core insertion machines by the device according to the invention therefore does not have to be bought with a replacement of the entire core insertion machine. It is sufficient to mount a new shooting head 15 here.
the shooting head jacket 4 corresponds to an upside-down pot with cylindrical walls and a base 19 already mentioned, which has an opening 20 in the middle for the shooting tube, which engages under the base 19 in an annular manner with its flange 7.
the shooting tube 2 is supported within the shooting head 15 itself. The support is provided here by the flange 7 being acted upon by the sand guide insert 5 against the bottom 19 of the shooting head jacket 4.
the connection between the shooting head jacket 4 and the tubular jacket 3 can be inserted from the recess of the shooting head 15 for the sand guiding insert 5 by insertable, parallel to the axis of the shooting tube 2 extending, engaging in the casing tube 3 positively engaging fasteners 22, in the exemplary embodiment shown by screws.
This has the advantage that the screws or the like are protected against damage from outside by their inner position.
there is no need to adjust the casing tube 3 on the shooting head casing 4 because two axial fastening elements 22 already provide a clear position of the casing tube 3 on the Shooting head jacket 4 is defined.
the screw connection can be loosened if the shooting head plate 6 has been loosened from the shooting head jacket 4 and the sand guide insert 5 and the shooting tube 2 have been pulled out of the shooting head jacket 4 or the jacket tube.
the two illustrated exemplary embodiments agree that it is now sufficient to detach the shooting head plate 6 from the shooting head jacket 4 in order to loosen other connecting elements such as screws or the like without loosening.
adapt the sand guide insert 4 and thus the weft channel l to the changing shooting head plates 6 and to be able to remove the shooting tube 3 for daily cleaning.
ring-shaped seals 23 can be seen, which are embedded in the ring-shaped fastening flange 21 of the shooting head shell on its side 12 facing the shooting head plate 6. They delimit a flat annular groove 24, which has a connection 25 on the fastening flange 21 to a vacuum source, in particular to a vacuum pump.
the shooting head plate 6 If the shooting head plate 6 is now placed on the ring-shaped seals 23 and the vacuum pump is put into operation, negative pressure is formed in the space enclosed by the seals 23, which leads to the shooting head plate 6 being pressed against the shooting head jacket 4 or the sand guide insert 5.
the shooting head plate can be released again by switching off the vacuum pump and admitting air.
the vacuum area covered by the sealing elements 23 or the annular groove 24 is here based on the weight of the Shooting head plate 6 matched.
the recessed annular groove 24 and the seals 23 can be dispensed with.
the adhesive connection due to the magnetic principle has the advantage that it ensures a secure adhesive connection regardless of a seal, as is necessary in the vacuum system.
the mounting flange 7 of the shooting tube 2 can be omitted if the shooting tube 2 simply with the end face of its shooting head end in an annular groove 28 on the circumference of the sand guide opening of the sand guide insert 5 or on the insert itself touches down.

Landscapes

Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Casting Devices For Molds (AREA)
Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Chutes (AREA)
Disintegrating Or Milling (AREA)
Jet Pumps And Other Pumps (AREA)

EP87109856A 1986-08-08 1987-07-08 Dispositif d'insufflation pour une machine à tirer les noyaux Expired EP0255876B1 (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT87109856T ATE48959T1 (de)	1986-08-08	1987-07-08	Einschiessvorrichtung an einer kernschiessmaschine.

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE3626995		1986-08-08
DE3626995		1986-08-08

Publications (3)

Publication Number	Publication Date
EP0255876A2 true EP0255876A2 (fr)	1988-02-17
EP0255876A3 EP0255876A3 (en)	1988-05-25
EP0255876B1 EP0255876B1 (fr)	1989-12-27

Family

ID=6307015

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP87109856A Expired EP0255876B1 (fr)	1986-08-08	1987-07-08	Dispositif d'insufflation pour une machine à tirer les noyaux

Country Status (4)

Country	Link
EP (1)	EP0255876B1 (fr)
AT (1)	ATE48959T1 (fr)
DE (1)	DE3761243D1 (fr)
ES (1)	ES2012075B3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CZ306766B6 (cs) *	2016-06-03	2017-06-21	Slévárna HEUNISCH Brno s.r.o.	Modifikovaná vstřelovací trubice pro jádrařské vstřelovací stroje
CN107377894A (zh) *	2017-09-08	2017-11-24	禹州市昆仑模具有限公司	一种性能优化射芯机
US11192173B2 (en)	2017-10-17	2021-12-07	Magma Giessereitechnologie Gmbh	Core shooting apparatus and method for controlling core shooting apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CZ29849U1 (cs)	2016-06-03	2016-10-04	Slévárna HEUNISCH Brno s. r. o.	Modifikovaná vstřelovací trubice pro jádrařské vstřelovací stroje

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE930104C (de) *	1954-02-16	1955-07-11	Fritz Hansberg	Maschine zur Herstellung von Giessereikernen und zum Einfuellen von Formsand in Formkaesten mittels Druckluft
US4378835A (en) *	1980-07-28	1983-04-05	The Osborn Manufacturing Corporation	Foundry core or mold making machine
US4570694A (en) *	1982-01-25	1986-02-18	Lund Robert S	Mold-blowing apparatus

1987
- 1987-07-08 AT AT87109856T patent/ATE48959T1/de not_active IP Right Cessation
- 1987-07-08 DE DE8787109856T patent/DE3761243D1/de not_active Expired - Lifetime
- 1987-07-08 ES ES87109856T patent/ES2012075B3/es not_active Expired - Lifetime
- 1987-07-08 EP EP87109856A patent/EP0255876B1/fr not_active Expired

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CZ306766B6 (cs) *	2016-06-03	2017-06-21	Slévárna HEUNISCH Brno s.r.o.	Modifikovaná vstřelovací trubice pro jádrařské vstřelovací stroje
CN107377894A (zh) *	2017-09-08	2017-11-24	禹州市昆仑模具有限公司	一种性能优化射芯机
CN107377894B (zh) *	2017-09-08	2023-12-01	青阳县木镇镇企业集体资产经营公司	一种性能优化射芯机
US11192173B2 (en)	2017-10-17	2021-12-07	Magma Giessereitechnologie Gmbh	Core shooting apparatus and method for controlling core shooting apparatus

Also Published As

Publication number	Publication date
EP0255876B1 (fr)	1989-12-27
EP0255876A3 (en)	1988-05-25
DE3761243D1 (de)	1990-02-01
ES2012075B3 (es)	1990-03-01
ATE48959T1 (de)	1990-01-15

Legal Events

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1987-12-31	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
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1990-04-06	ET	Fr: translation filed
1990-05-16	NLV1	Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
1990-07-04	GBV	Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]
1990-07-08	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: AT Effective date: 19900708
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1990-12-12	26N	No opposition filed
1991-07-31	ITTA	It: last paid annual fee
2000-06-26	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: ES Payment date: 20000626 Year of fee payment: 14
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