JPH0675686B2 - Method of manufacturing impactor for impact type crusher - Google Patents

Description

Description: [Industrial application] The present invention relates to a striker for an impact type crusher that impact crushes rocks, ores, etc., and in particular, a chip of a cemented carbide material provided in the impact part is chipped. The present invention relates to a method for manufacturing a striker for an impact type crusher capable of reducing cracks.

[Prior art]

The conventional impact type crusher is configured as shown in the schematic sectional view of FIG.

For example, the rough stone put into the crushing chamber 3 through the raw material supply port 2 installed above the side of the impact crusher 1 is a striker fixed to the outer periphery of the rotary rotor 5 rotating around the main shaft 4. Impact crushed by 6.

The rough stone hit by the rotating rotor 5 is crushed by colliding with the liner 7a attached to the first repulsion plate 7 provided at the upper portion of the crushing chamber 3, and the rough stone returning is further rotated. It is then hit and crushed by the next hitting element 6. Then, the bounced rough stones are further finely crushed by the liner 8a attached to the second repulsion plate 8 provided in the upper portion of the crushing chamber 3.

In the case of the conventional impact type crusher 1 as described above, the striker 6 formed as an integral body is generally made of high chromium cast iron or a hard metal material such as high manganese cast steel or chrome molybdenum cast steel. There is.

However, in such a hitting element 6, when the impact is repeated with the hard raw ore because the hard mineral is also included on the side of the raw ore to be crushed, it is shown in FIG. It will be worn out in sequence.

That is, as shown in FIG. 3 (a), the tip portion 6a of the striker 6 whose initial shape is shown by a solid line is gradually changed as shown by a plurality of broken lines in FIG. 3 (b). It wears out and transforms into a rounded shape.

In the conventional impact type crusher 1, it is uneconomical to discard the hitting element 6 in this state, so that the hitting element 6 is turned upside down as shown in FIG. Continue to use until wear progresses as shown by the broken line in FIG.

Thus, in the conventional impact type crusher 1, the impact element 6 is
Since the wear resistance of No. 1 was not sufficient, if the impactor 6 wears and the tip 6a becomes rounded, it becomes difficult for the crushed object to collide head-on, and the crushing ability deteriorates. There was a drawback that the cost increase would be large.

In addition, the replacement frequency including the above-mentioned reversal of the hitting element 6 is extremely frequent, for example, once every 1.5 to 3 months in the crushing of rocks for aggregates, and there is a problem that the operation efficiency is hindered. It was

Therefore, in recent years, in order to reduce such wear of the striker, a piece of cemented carbide material is attached to each joining base detachably attached to the tip of the striker and divided into a plurality of parts in the direction of the main shaft of the rotating rotor. Those joined by melting have been developed.

Joining the cemented carbide pieces to each joining table is, for example, 0.3 to 1.0.
The temperature (800 to 900
It is done by heating to ℃), brazing, and then cooling.

[Problems to be Solved by the Invention]

However, in the striking element to which the cemented carbide material piece is brazed as described above, thermal stress remains in the vicinity of the joint due to the difference in the coefficient of thermal expansion between the cemented carbide material piece and the joint table due to thermal history. Especially when residual thermal stress acting on the tensile side occurs,
During the actual crushing work, the tensile force due to the collision of the raw materials is added to this thermal stress, and the probability of breakage of the cemented carbide material piece increases.

Therefore, the purpose of the present invention is to reduce the thermal stress generated in the vicinity of the joint part with respect to the joining base of the cemented carbide material piece when brazing the cemented carbide material piece to the joining base,
It is an object of the present invention to provide a method for manufacturing a hitting element which has high impact resistance and can form a hitting element for an impact type crusher that can be used for a long time.

[Means for Solving the Problems]

In order to achieve the above object, the main means adopted by the present invention is, as its gist, a rotating rotor that rotates around a main shaft provided inside a casing, and is fixed to an outer peripheral portion of the rotating rotor. A plurality of impactors and a repulsion plate provided around the rotary rotor at an appropriate distance, and the raw material spattered at the tip of the rotating impactor collides with the tip of the impactor and the repulsion plate. In a method of manufacturing a hitting element for an impact type crusher that is crushed by crushing, a metal joining base detachably attached to the tip of the hitting element has a flat rectangular shape with one side of 10 mm or more and a thickness of 8 mm or more. after brazed by silver braze the superhard material pieces were sandwiched C _u, impact crusher for blow according to the point obtained by annealing the aforementioned joining base with superhard material piece in an atmosphere of 400 to 600 ° C. It is a method of manufacturing a child.

[Action]

By brazing the cemented carbide material piece to the joining table and annealing it in an atmosphere of 400 to 600 ° C., the thermal strain in the vicinity of the joined portion of the cemented carbide material piece is removed, and the generation of thermal stress is suppressed.

In the case of a cemented carbide material piece with a side of less than 10 mm and a rectangular shape of less than 8 mm, the effect of removing thermal strain was found even after annealing in an atmosphere of 400 to 600 ° C after silver brazing. I can't.

〔Example〕

Embodiments embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. The following examples are examples of embodying the present invention and are not of the nature to limit the technical scope of the present invention.

Here, FIG. 1 shows a main part of a striker manufactured by a manufacturing method according to an embodiment of the present invention, in which FIG. 1 (a) is a front view and FIG. 1 (b) is a side view. Is.

In the method for manufacturing a striker according to this embodiment, first, a steel base 9 (see FIGS. 1 (a) and 1 (b)) detachably attached to the tip of the striker has a flat surface with a side of 10 mm or more. Carbide tip 10 (carbide piece) with a rectangular shape and a thickness of 8 mm or more
There are brazed by silver solder structure was sandwiched _{C u (A g -C u)} . By brazing the cemented carbide tip 10 to the joining base 9 using the above-described sandwich braze, the cemented carbide tip 10 can be firmly joined to the joining base 9.

After that, the joining table 9 and the cemented carbide chip 10 are heated in a furnace at 400 to 600 ° C. for 1 hour or more, and then cooled in the oven (50 ° C./h or less), so that the cemented carbide chip 10 together with the joining table 9 Is annealed.

The cemented carbide tip 10 and the joining base 9 which have been annealed as described above are fixed to the tip of the striker with screws, for example.

In the striker manufactured by the above-mentioned procedure, the cemented carbide tip 10 is brazed to the joining base 9 and the temperature is 400 to 600 ° C.
By performing the annealing treatment in the atmosphere, the thermal strain in the vicinity of the bonded portion of the cemented carbide chip 10 is removed, and the generation of thermal stress is suppressed. As a result, the impact resistance with respect to the rough stone put into the crushing chamber of the impact crusher is improved, and it is possible to withstand long-term use.

Table 1 below shows the results of investigation of the state of chipping of the cemented carbide tip 10 when the impact crushing test was continuously conducted for 5 months using the hitting element manufactured by the above procedure.

In this test, the peripheral speed of the striker attached to the rotary rotor was 30 m / s, and the rough stone put into the crushing chamber of the impact crusher was gravel, and the maximum grain size was 60 mm.

The thickness of the sandwich brazing material used for brazing the cemented carbide tip 10 to the joining base 9 is 0.6 mm, and the annealing time is about 1 hour. The furnace was cooled after annealing, and the cooling rate from the annealing temperature to 50 ° C was about 25 ° C / h.

As is clear from Table 1 above, the cemented carbide tip 10 is attached to the joining base 9.
Was brazed and annealed in an atmosphere of 400 to 600 ° C., so that the cemented carbide chip 10 could be used for a long period of time without causing cracks or chips.

At the same time, when the temperature in the annealing treatment is 400 ° C or less, the effect of reducing the thermal strain is hardly seen, and the temperature of the annealing treatment is
It was also found that when the temperature was 600 ° C or higher, the joint strength was lowered.

Although not shown in Table 1 above, the above cemented carbide tip
As 10, a flat rectangular shape with a side of less than 10 mm and a thickness of 8 mm
If less than 400-600 after silver brazing
The effect of removing the thermal strain could not be obtained even if the annealing treatment was carried out in the atmosphere of ° C.

〔The invention's effect〕

As described above, the present invention is suitable for a rotary rotor that rotates around a main shaft provided inside a casing, a plurality of hitting elements that are fixedly provided on an outer peripheral portion of the rotary rotor, and a periphery of the rotary rotor. Manufacture of a striker for a shock-type crusher, which comprises a repulsion plate provided at a distance, and crushes the raw material splashed to the tip of a rotating impactor by colliding the material with the impactor tip and the repulsion plate. In the method, a metal joining table that is detachably attached to the tip of the hitting element has a side of 10
in mm or more planes substantially quadrangular shape, after the thickness has been brazed by silver solder or more superhard material pieces 8mm was sandwiched C _u, the joining base and a superhard material piece in an atmosphere of 400 to 600 ° C. Since it is a method for manufacturing a hitting element for an impact type crusher characterized by being subjected to an annealing treatment, it is possible to reduce the thermal stress generated in the vicinity of the joining portion of the cemented carbide material piece to the joining table. As a result, the impact striker has improved impact resistance and can be used for a long time.

[Brief description of drawings]

FIG. 1 shows a main part of a striker manufactured by a manufacturing method according to an embodiment of the present invention. FIG. 1 (a) is a front view, FIG. 1 (b) is a side view, and FIG. FIG. 3 is a side sectional view of a conventional impact type crusher, and FIG. 3 is an explanatory view showing a state of progress of wear of a conventional impactor. [Explanation of symbols] 9 ... Joining base 10 ... Carbide chip (piece of superhard material).

Claims (1)

[Claims] 1. A rotary rotor rotating around a main shaft provided inside a casing, a plurality of hitting elements fixedly mounted on an outer peripheral portion of the rotary rotor, and provided around the rotary rotor at an appropriate distance. In the method of manufacturing a striker for an impact-type crusher, which comprises a repulsion plate and is crushed by colliding the raw material bounced off at a rotating impactor tip with the impactor tip and the repulsion plate, A metal joining base that is detachably attached to the tip of the striker, has a flat rectangular shape with a side of 10 mm or more and a thickness of 10 mm or more.
After the above superhard material piece 8mm brazed by silver solder which is sandwiched a C _u, the joining base and a superhard material piece 400
A method for manufacturing a striker for an impact type crusher, which is characterized by being annealed in an atmosphere of up to 600 ° C.