CN1022582C - Method and apparatus for machining sieve plate - Google Patents

Abstract

The present invention relates to a device for machining screen plates and holes for screening pulp, which is composed of a machine body, an operating platform, a planer frame, a cutter frame, a cutter holder, a cutter head, an oil pool and a power supply, wherein a workpiece is fixed to the operating platform, and the oil pool is welded around the operating platform; during machining, the oil pool is full of kerosene which is circulated; the left and right movement of the cutter holder, the upward and downward movement of electrodes and the frontward and backward movement of the operating platform are used for implementing cutter setting and machining screen holes. The device for machining screen plates and holes for screening pulp is especially applicable for machining screen plates with thousands of holes per square meter, the machining efficiency is high, and the inverted conical holes are favorable for conducting pulp.

Description

Method and apparatus for machining sieve plate

The present invention relates to a kind of method and apparatus of apparatus for machining sieve plate sieve aperture, belong to the spark machined class.

The machine that is used to screen paper pulp in the paper industry is called pulp screen, sieve plate is housed on the pulp screen, on corrosion resistant metal plate (as corrosion resistant plate), process long narrow many sieve apertures, claim this dull and stereotyped, then sieve plate is curved garden tubular or other shape, perhaps for sieve plate, earlier flat board is curved garden tubular or other shape, reprocess out long narrow sieve aperture, sieve plate is loaded on the pulp screen, so that paper pulp is screened.

Processing long narrow cylindrical void group on the flat board or on the plate of moulding, be a very hard to tackle operation.Generally be to adopt mechanical stamping (to thin plate) and mechanical Milling Process (to slab), carry out Milling Process for the sieve aperture of stainless steel thick plate, efficient is low, the expense costliness, and hole shape is the straight-arm hole.In american documentation literature, a kind of electric discharge machining apparatus of processing micro-hole on workpiece is disclosed, the patent No. is 4771157, authorizing day is on September 13rd, 1988.Referring to Fig. 7, this device by the mobile device 11,2,14 of the positioner of the processing unit (plant) that has electrode 4, electrode mobile device 10, band microscope 12, workpiece 1 and 17 and brake apparatus form, be used for processing single hole, miniature garden, and process a round (Fig. 8,9,10 and 11) that drains into several rows.Its weak point is: can not be used for processing the sieve plate of every square metre of hole count up to thousands of.

The method and the device that the objective of the invention is to overcome above-mentioned weak point of the prior art and a kind of apparatus for machining sieve plate sieve aperture is provided.

Purpose of the present invention can realize by following technical solution: processing unit (plant) is made up of lathe bed, workbench, portal frame, knife rest, knife bar, the cutter head that the multi-disc electrode is housed, oil sump and power supply.Workpiece to be processed (being generally rectangular corrosion resistant plate) is fixed on the workbench, go out oil sump with the steel plate weld all around above around the workbench, add and be full of kerosene in the oil sump in man-hour and circulate, by move left and right, moving up and down of multi-electrode cutter head and the moving forward and backward of workbench of knife bar, to carry out tool setting and to process sieve aperture.The hole shape that processes is stepped back taper, and its processing method is: with thicker electrode, process the inverted cone shape blind hole earlier, with thin electrode, the centre in position, former inverted cone shape hole down processes shallow long narrow cylindrical void then.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the front view of processing unit (plant) of the present invention.

Fig. 2 is the side view of Fig. 1.

Fig. 3 is the enlarged drawing of the inverted cone shape blind hole section that processes earlier.

Fig. 4 is the enlarged drawing of the stepped reverse taper hole section of sieve plate.

Fig. 5 is sieve plate hole group's a schematic diagram.

Fig. 6 is for curving Fig. 5 sieve plate in the screen drum figure of garden tubular.

Fig. 7 is the stereogram of the device of prior art processing micropore.

Fig. 8 processes the schematic diagram of a round for prior art.

Caused angular error (θ angle) when Fig. 9 processes a round (hole, a plurality of garden) for prior art.

Figure 10,11 processes the positioning process diagram in a round (hole, a plurality of garden) for prior art.

The present invention is described in further detail below in conjunction with embodiment and accompanying drawing: referring to Fig. 1 and Fig. 2, the device of apparatus for machining sieve plate adopts lathe bed 51, workbench 52, portal frame 56 and the knife rest 57 of waste and old metal-planing machine, knife bar 58 and cutter head 59 are housed on knife rest, can parallel installation process the elongate thin plate electrode 60 of usefulness on the cutter head, number of electrodes is 5～100, with 30～50 is preferable, external power source adopts JF-210Q or JF-420Q(combined type transistor pulse generator) 63, by current supply line 61 and 62, be connected to respectively on electrode 60 and the workpiece (being the rectangle corrosion resistant plate) 54.The electrode of processing usefulness adopts high-quality red copper pool, forms through Overheating Treatment destressing and pressure straightening.

Workpiece to be processed 54 is fixed on the workbench 52, top around the workbench becomes oil sump 53 with the steel plate weld all around, add and charge into kerosene 55 in the oil sump in man-hour, be communicated with oil sump at enough big fuel tank (not shown) of underground placement, make the kerosene in the oil sump obtain circulation cooling and sedimentation and filtration by oil pump, the effect of kerosene is insulation, cooling and gets rid of the steel cuttings that spark machined goes out.

By the move left and right of knife bar 58 on knife rest 57, cutter head 59 move forward and backward (all these is motor-driven), with the tool setting before processing with process whole sieve apertures together with the workbench that moves up and down and be equipped with workpiece 54 52 of electrode 60.Tool setting step: electrode is adjusted to workpiece is to be processed to be gone out directly over the sieve aperture, start feed (electrode) motor, driving knife bar 58 descends, make the distance of electrode and workpiece just in time satisfy the required discharge requirement of processing, then, connect power supply, make it produce electric spark, so that workpiece is carried out spark machined.Preferably 30～50 of the electrode slice numbers of processing usefulness to be processedly go out 30～50 sieve apertures, promote knife bar and cutter head.By the motor-driven of knife bar, cutter head and workbench moved, successively the whole sieve apertures on the workpiece are machined.

The procedure of processing of stepped reverse taper hole is as follows: with thicker electrode, thickness of electrode is littler 0.02 millimeter than the every limit of the width in long narrow hole earlier, and this 0.02 millimeter is discharging gap.Continuous decline along with electrode, because constantly being depleted of electrode, the cross section of sieve aperture is back taper blind hole 64, see Fig. 3, after treating all to process the back taper blind hole on the whole work-piece, change thinner electrode into, centre in former back taper blind hole, down process shallow long narrow hole 65, the width in this hole is generally 0.25～0.9 millimeter, sees Fig. 4.

The present invention contrasts prior art and has following advantage: prior art (seeing that the above-mentioned patent No. is 4771157 United States Patent (USP)) can only process single hole or round, the present invention can process the group hole of long narrow shape, is specially adapted to process the pulp screen sieve plate of every square metre of dull and stereotyped hole count up to thousands of; Aperture type of sieve plate is back taper, is conducive to lead slurry; The working (machining) efficiency height.

Claims (4)

1, a kind of processing method of screening paper pulp with the sieve plate sieve aperture, it is characterized in that, workpiece to be processed is fixed on the workbench, weld all around goes out oil sump above around the workbench, add and be full of kerosene in the oil sump in man-hour and circulate, move left and right, moving up and down of multi-electrode cutter head and moving forward and backward of workbench by knife bar, to carry out tool setting and to process sieve aperture, sieve aperture be shaped as stepped back taper, with thicker electrode, process the inverted cone shape blind hole earlier, then with thin electrode, in the centre of former inverted cone shape blind hole, down process long narrow cylindrical void.

2, a kind of processing unit (plant) that screens paper pulp with the sieve plate sieve aperture, it is characterized in that, by lathe bed, workbench, portal frame, knife rest, knife bar, multielectrode cutter head, oil sump and power supply be housed form, dress knife bar and cutter head on the knife rest, the long thin plate electrode of parallel installation on the cutter head.

3, device according to claim 2 is characterized in that, the number of electrodes on the cutter head is 5～100.

4, device according to claim 3 is characterized in that, the number of electrodes preferred values on the cutter head is 30～50.

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