DE3637367A1 - Device for removing the core sand from castings - Google Patents

Abstract

For the removal of core sand from castings, a percussion-piston system (5) is fixedly arranged and the free end of its percussion piston (4) is firmly connected to a clamp-on plate (6) supported in vibratory fashion on a fixed frame (2) and intended for clamping on the castings (1). It is thus possible to transmit the high-power vibrations of the percussion-piston system without dissipation to the clamp-on plate, forming a vibrating unit with the percussion piston, and hence also directly and without dissipation to the castings clamped on the plate. As a result, the core sand is now vibrated out in seconds, even from the smallest and most tortuous channels and the like.

Description

The present invention relates to a device for Removing the core sand from cast pieces, which cast Pieces for this the stroke frequency of a hydraulic or pneumatic percussion piston system.

With the increase in the complexity of castings, such as engine blocks, cylinder heads u. The like also increases the problem from and from these castings after the casting has been completed to remove hard-burned core sand, what with the known Facilities for this no longer achieved satisfactorily can be.

A device of this type leaves the same applicant already a significant improvement in that as Vibrator a pneumatic hammer or the like is used, which itself on a frame via a shock and vibration damping de liner supports stationary, the hammer tip of the  Pneumatic hammer with one, butting the frame over another and vibration damping liner supported anvil form a clamping unit for the cast piece; but also here the core sand is not always reached, also from undercuts and the smallest holes on the cast Remove pieces, which requires expensive rework.

Another major disadvantage is that even the smallest cast Parts have to be treated bit by bit.

The object of the present invention is therefore Creation of a facility for core sand removal, which the processing of individual large cast pieces as well the processing of many small cast pieces at the same time leaves and which is able to remove any core sand and of any cast piece completely and quickly to remove.

According to the invention, this is first achieved by that the percussion piston system is stationary and that free end of his percussion piston firmly swinging with one capable of being supported on a fixed frame Plate for clamping the cast pieces is connected.

This makes it possible to control the high-performance vibrations of the  Percussion piston system lossless on that, with the percussion piston a mounting plate forming a vibration unit and thus also directly and without loss on the on the plate stretched cast pieces. This is the core sand now also in seconds from the smallest and ver winding channels u. vibrated out like.

It is there for optimal support of the clamping plate with advantage if the swingable support of the span plate on the frame above, in both swing directions damping effective compression springs.

For quick attachment of any cast piece on the Clamping plate it is further advantageous if the on clamping plate is a grooved plate.

It can also be beneficial for a rational hand be when the stationary frame as a carousel is formed.

On the one hand, to remove the core sand even more effectively can, on the other hand, the stricter conditions to the Taking air pollution into account, it is an advantage if a suction system with at least one, on the cast piece in question emptying suction pipe to Ab  suck the core sand is arranged.

It is also environmentally friendly if there is everything around it sound-absorbing housing is provided.

An example embodiment of the subject of the invention The following is based on the drawing, which is in part wise graphical representation of the facility to the core Sand removal shows, explained in more detail.

The stationary device shown for removing the core sand from here a cast piece 1 comprises a fixed frame 2 , on which a, here rectangular-shaped platen 6 for clamping the cast piece 1 is supported in an oscillatory manner.

The free end of a percussion piston 4 of a percussion piston system 5 is preferably connected centrally and from below to the clamping plate 6 . The percussion piston system is firmly supported on the frame 2 and preferably projects vertically upwards with its percussion piston 4 .

Of course, an arrangement of the percussion piston system above the clamping plate 6 is also conceivable, as is an inclined position of the percussion piston to the plane of the plate is possible.

The percussion piston system 5 can be a conventional hydraulic hammer or a pneumatically operated arrangement.

The oscillatory support of the clamping plate 6 on Ge stell 2 takes place via compression springs 15 and 16 which act in both oscillating directions, of which a plurality are distributed around the circumference of the plate 6 and are guided by corresponding bolts 13 . Each bolt 13 penetrates the upper bearing frame of the frame 2 and carries on its underside a flange 14 which supports the lower spring 16 . This results in a relatively simple but effective support of the clamping plate 6 on the frame 2 .

The clamping plate 6 is preferably a so-called groove plate with a plurality of guide grooves 30 for receiving screw bolts for arbitrarily clamping one or more cast pieces.

The entire device is preferably surrounded by a walk-in housing chamber 23 .

A suction system 20 with at least one suction pipe 21 opening out at the relevant casting 1 is arranged preferably within the housing chamber 23 and above the clamping plate 6 for suctioning off the core sand.

High is particularly suitable for vacuuming the core sand pressure suction systems for point extraction, with which the core sand near the core sand source with relatively high current speed can be recorded and extracted. Such Suction devices work with high negative pressure and low air quantities and thus enable the use of small pipe crosses cuts and light, highly flexible suction hoses. This ge equips to provide many suction hoses on the suction system, around these at the extreme openings of the cast Pieces.

Thus, from the above, a facility for Core sand removal, which despite a relatively simple concept tion can meet all requirements.

Of course, there are a number of modifications possible without leaving the inventive concept. In particular in particular, the whole can be designed as a carousel to facilitate loading and unloading of the device. The platen can be round or polygonal Form and / or exchangeable. Furthermore, other fishing,  Suction and channel means conceivable for core sand removal.

Claims (6)

1. Device for removing the core sand from castings, which castings are exposed to the impact frequency of a hydraulic or pneumatic percussion piston system, characterized in that the percussion piston system ( 5 ) is arranged in a fixed position and the free end of its percussion piston ( 4 ) is fixed with it a swingable on a stationary frame ( 2 ) supported th clamping plate ( 6 ) for clamping the cast pieces ( 1 ) is connected. 2. Device for core sand removal according to claim 1, characterized in that the oscillatory support of the clamping plate ( 6 ) on the frame ( 2 ) via compression springs ( 15 ; 16 ) acting in both oscillation directions. 3. Device for core sand removal according to claim 1, characterized in that the clamping plate ( 6 ) is a grooved plate. 4. A device for core sand removal according to claim 1, characterized in that above the clamping plate ( 6 ) has a suction system ( 20 ) with at least one, on the cast piece ( 1 ) opening out suction pipe ( 21 ) for sucking off the core sand is arranged. 5. Device for core sand removal according to claim 1, characterized in that the fixed frame ( 2 ) is designed as a carousel. 6. A device for core sand removal according to claim 1, characterized by an all-surrounding sound-absorbing housing ( 23 ).