CN212713755U

CN212713755U - Cobalt removing device for diamond composite sheet

Info

Publication number: CN212713755U
Application number: CN201921694582.2U
Authority: CN
Inventors: 林宁
Original assignee: HENAN JINGRUI SUPERHARD MATERIAL CO Ltd
Current assignee: HENAN JINGRUI SUPERHARD MATERIAL CO Ltd
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2021-03-16
Anticipated expiration: 2029-10-10

Abstract

The application discloses cobalt device is taken off to diamond compact, including the solution tank, the medial surface in solution tank is provided with the fixture that spanes the solution tank, is fixed with the lower extreme open-ended and takes off the cobalt mould on the fixture, and the diamond compact that takes off the internal surface of cobalt mould and composite bed lie in the lower part forms interference fit, and fixture can make the composite bed of diamond compact alone dip in the cobalt liquid that takes off in the solution tank. Above-mentioned diamond compact cobalt removal device can get into the ring of the different design requirements of the high assurance of taking off cobalt liquid according to the cobalt removal time and composite bed and take off the effect, and can guarantee that the cobalt removal liquid no longer permeates the outside corruption of compound piece carbide that leads to in the clearance of taking off cobalt mould piece hole and compound piece excircle to the compound piece carbide that takes out untimely condition can not appear because compound piece carbide that the compound piece side cobalt removal degree leads to deeply corrodes the condition yet.

Description

Cobalt removing device for diamond composite sheet

Technical Field

The utility model relates to a diamond compact technical field, more specifically say, relate to a diamond compact takes off cobalt device.

Background

Polycrystalline Diamond Compact (PDC) is synthesized by diamond micropowder and a hard alloy matrix in a high-temperature high-pressure (HTHP) environment, is of a cylindrical structure in appearance, is generally cylindrical, has other shapes such as a conical shape, an arc shape and a ridge shape in a composite layer, has good wear resistance, impact toughness and thermal stability, and is widely applied to the fields of petroleum and geological drilling, machining cutters, correction tools and the like.

In the manufacturing process of the existing Polycrystalline Diamond Compact (PDC), in order to improve the synthesis efficiency of the compact, in the synthesis process, metals such as iron, cobalt, nickel and the like are required to exist in a composite layer of the diamond compact as a catalyst and a binder, but in the use process of the diamond compact, because the thermal expansion coefficient and the elastic modulus of the residual metals are greatly different from those of diamond, the phenomena such as cracking, layering and the like of the composite layer of the compact can be caused, so that the wear resistance and the thermal stability of the diamond compact are sharply reduced, the compact fails in the use process, the service life of the diamond compact is greatly shortened, so that the residual metals in the composite layer of a general diamond compact are removed before the diamond compact is used to form a cobalt removal layer with a certain height and a certain shape, the process is commonly called cobalt removal, and the cobalt removal shape which is better fed back in the current market is annular removal, it specifically is that the cobalt degree of depth is greater than the cobalt degree of depth that takes off of compound piece middle part for the side, because compound piece all begins to use from the border position in the use, the mode that this kind of ring takes off can provide the cobalt layer that takes off of bigger volume, promotes compound piece's result of use and thermal stability.

At present, the most common way of removing cobalt from a composite sheet is to make residual metal in a composite layer of the composite sheet chemically react with cobalt removing liquid, generally speaking, the cobalt removing liquid is mixed strong acid, specifically, the composite sheet is put into a cobalt removing mould block to be protected, only one surface of the composite layer is exposed outside, the side surfaces of the composite layer are wrapped up to make the side surfaces not exposed in the cobalt removing liquid, then the cobalt removing mould block with the composite sheet is wholly immersed in the cobalt removing liquid, the cobalt removing liquid gradually permeates into the composite layer along with the continuous contact and reaction of the residual metal on the surface layer of the composite layer and the cobalt removing liquid, after a certain time of cobalt removal, the composite layer can form a cobalt removing layer with a certain height and a certain shape, the residual metal in the cobalt removing layer is not present, and the using effect of the cobalt removing layer part is the best in the using process of the composite layer. In order to reduce the cobalt removing time, the cobalt removing liquid is generally heated to a certain temperature, and ultrasonic vibration is assisted to accelerate the reaction speed of metal and the cobalt removing liquid, so that the cobalt removing efficiency is improved, and the cobalt removing mode has the advantages of simple operation, low cost and higher cobalt removing efficiency, but still has some defects: the first is that in the cobalt removing process, the whole cobalt removing mould block is in the cobalt removing liquid, although the inner hole of the cobalt removing mould block and the excircle of the composite sheet are designed to be in interference fit, the inner hole of the cobalt removing mould block can gradually expand along with the temperature rise and vibration of the cobalt removing liquid, so that the gap between the inner hole of the cobalt removing mould block and the excircle of the composite sheet is enlarged, the cobalt removing liquid flows into the hard alloy part along the gap, and the hard alloy substrate of the composite sheet can be corroded; secondly, along with the continuous penetration of the cobalt removing liquid of the composite layer of the composite sheet, when the cobalt removing composite sheet is not taken out timely, the cobalt removing liquid can directly penetrate into the position of the hard alloy substrate, so that the hard alloy substrate is corroded, the bonding strength of the composite layer of the composite sheet and the hard alloy can be reduced due to corrosion of light points, the composite sheet is subjected to delamination in the using process, the composite sheet can be directly scrapped due to serious corrosion, and particularly under the ring-off mode, the probability of corrosion to the hard alloy substrate of the composite sheet is higher due to the fact that the cobalt removing depth of the side surface of the composite layer is deeper than that of the middle position of the composite layer.

Therefore, how to form a better annular-off shape in the existing chemical cobalt-removing mode, and simultaneously effectively avoid the corrosion of the hard alloy matrix caused by the too deep cobalt-removing depth of the annular-off side surface due to the untimely taking-out of the composite sheet, and simultaneously avoid the alloy corrosion caused by the large influence of external conditions on the gap between the inner hole of the cobalt-removing die block and the outer circle of the composite sheet becomes a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem, the utility model provides a cobalt device is taken off to diamond compact piece can get into the better cobalt shape of taking off of highly guaranteeing of taking off cobalt liquid through adjusting the time of placing and the composite bed, and it no longer permeates the outside corruption that takes off cobalt mould piece hole and the clearance of compound piece excircle leads to compound piece carbide to take out the untimely circumstances of taking out the circumstances of also can not appearing because the compound bed side takes off the too dark carbide base member of the compound piece that leads to of cobalt degree corrodes simultaneously to take off cobalt compound piece.

The utility model provides a pair of cobalt device is taken off to diamond compact, including the solution tank, the medial surface of solution tank is provided with and spanes the fixture of solution tank, be fixed with lower extreme open-ended cobalt mould that takes off on the fixture, the diamond compact piece that takes off the internal surface of cobalt mould and composite bed position in the lower part forms interference fit, fixture can make alone diamond compact piece's composite bed is soaked in the cobalt liquid that takes off in the solution tank.

Preferably, in the cobalt removing device for the diamond compact, the height of the cobalt removing mold for placing the inner cavity of the diamond compact is greater than the height of the outer circle alloy part of the diamond compact.

Preferably, in the above cobalt removing device for a diamond compact, the solution tank has a scale line in the height direction for indicating the height of the fixture.

Preferably, in the above cobalt removing device for a diamond compact, the jig may move up and down along an inner side surface of the solution tank.

Preferably, in the above cobalt removing device for a diamond compact, the cobalt removing mold is a polymer plastic block mold.

Preferably, in the above cobalt removing device for a diamond compact, the shape of the jig is a long strip.

Preferably, in the cobalt removing device for the diamond compact, the fixture is connected with the cobalt removing mold in an interference fit manner.

Preferably, in the above apparatus for decobalting a diamond compact, the cross-sectional shape of the decobalting mold is circular or rectangular.

According to the technical scheme, the cobalt removing device for the diamond composite sheet provided by the utility model has the advantages that as the inner side surface of the solution tank is provided with the clamp spanning the solution tank, the cobalt removing mould with the lower end opening is fixed on the clamp, the inner surface of the cobalt removing mould and the diamond composite sheet with the composite layer positioned at the lower part form interference fit, the clamp can independently ensure that the composite layer of the diamond composite sheet is immersed into the cobalt removing liquid in the solution tank, when cobalt is removed, on one hand, because the cobalt removing grinding tool block is not immersed into the cobalt removing solution, the protection of the composite sheet is not influenced by the temperature and the vibration of the cobalt removing solution, the interference fit of the inner diameter of the cobalt removing mould block and the composite sheet is ensured, the cobalt removing liquid is not existed any longer, the cobalt removing liquid enters the gap between the inner diameter of the cobalt removing mould block and the composite sheet to corrode the hard alloy of the composite sheet, and on, the height of the composite layer does not change in the whole decobalting process, the periphery of the composite layer of the composite sheet is contacted with a decobalting solution, a shape with a uniform and annular decobalting layer is naturally formed under the permeation action of the decobalting solution, the decobalting depth of the side surface of the composite sheet is determined under the condition that the immersion height of the composite layer is fixed, and the decobalting depth of the middle part of the composite sheet is controlled by adjusting the decobalting time, so that the ring-off of the decobalting depth of the side surface and the middle part of the composite sheet with different design size requirements is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a front sectional view of a cobalt removing device for a diamond compact provided by the present application.

Detailed Description

The core of the utility model is to provide a cobalt device is taken off to diamond compact piece, can get into the effect that the ring of highly guaranteeing different designing requirements of taking off cobalt liquid according to the cobalt time of taking off with the composite bed takes off, can guarantee moreover that cobalt liquid no longer permeates the outside corruption of compound piece carbide that leads to in the clearance of taking off cobalt mould piece hole and compound piece excircle to the condition that the carbide base member that cobalt liquid permeates to compound piece can not appear yet leading to compound piece carbide to corrode under the untimely condition of taking out of the compound piece of taking off cobalt.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

An embodiment of a cobalt removing device for a diamond compact provided by the present application is shown in fig. 1, fig. 1 is a front view cross-sectional view of the cobalt removing device for a diamond compact provided by the present application, the device includes a solution tank 4, the solution tank 4 is covered with an acid-resistant polymer material inside and outside to ensure that the solution tank 4 is not corroded, a cobalt removing liquid 5 is filled in the solution tank 4, the depth of the cobalt removing liquid 5 can be adjusted according to the height of the cobalt removing, a fixture 3 crossing the solution tank 4 is arranged on the inner side surface of the solution tank 4, the specific shape of the fixture 3 is not limited, and the connection mode between the fixture 3 and the solution tank 4 is not limited as long as the composite compact can be fixed, a cobalt removing mold 1 with an opening at the lower end is fixed on the fixture 3, the cobalt removing mold 1 is similar to a reversed cup for accommodating a diamond compact 2, and the inner surface of the cobalt removing mold 1 and the diamond compact 2 located at the lower part of the, the two parts can be relatively static, the diamond composite sheet 2 can not slide down to the cobalt removing liquid 5 under the action of gravity, after cobalt removing is finished, the diamond composite sheet 2 can be taken out in a mode of damaging the cobalt removing mould 1, the cobalt removing liquid 5 can be a mixture of various inorganic acids, generally nitric acid, hydrochloric acid, hydrofluoric acid and the like, the proportion of various specific solutions is not limited, the fixture 3 can independently enable the composite layer of the diamond composite sheet 2 to be immersed into the cobalt removing liquid 5 in the solution tank 4, namely, in the whole cobalt removing process, the cobalt removing liquid can not completely contact with the hard alloy part of the diamond composite sheet, so that corrosion to the hard alloy can not be caused, and the flexibility of cobalt removing is increased by using the device.

In the actual operation, a certain volume of cobalt removing liquid 5 is poured into a solution tank 4, a fixture 3 is adopted to fix a cobalt removing mould 1 to a certain height, so that a composite layer of a diamond composite sheet 2 is independently contacted with the cobalt removing liquid 5, the side surface of the composite layer needs to be removed with much depth, the composite layer with the corresponding height is placed into the cobalt removing liquid 5, the final cobalt removing depth is the height of the composite layer entering the cobalt removing liquid, attention needs to be paid, the upper surface of the cobalt removing liquid 5 cannot be higher than the lower part of the cobalt removing mould 1, in the whole cobalt removing process, as the cobalt removing mould 1 is not in the cobalt removing liquid 5 with a certain temperature, the interference fit between the cobalt removing mould 1 and the excircle of the composite sheet is very stable and safe, the cobalt removing liquid 5 cannot be contacted with the hard alloy part of the composite sheet, in addition, in the process of upside down placement, the cobalt removing liquid 5 is in the composite layer and the excircle part of the reciprocating sheet, the maximum penetration height of the cobalt removing liquid cannot exceed the, the maximum value of the decobalting depth is fixed no matter how long the decobalting time is.

According to the technical scheme, in the embodiment of the cobalt removing device for the diamond composite sheet, the inner side surface of the solution tank is provided with the fixture which stretches across the solution tank, the fixture is fixed with the cobalt removing mold with the lower end being opened, the inner surface of the cobalt removing mold and the diamond composite sheet of the composite layer at the lower part form interference fit, the fixture can independently immerse the composite layer of the diamond composite sheet into the cobalt removing liquid in the solution tank, so that the cobalt removing height can be adjusted to be corresponding according to actual needs, the annular cobalt removing effect is realized, a good cobalt removing shape can be ensured by adjusting the placing time and the height of the composite layer entering the cobalt removing liquid, the height can not be changed in the whole cobalt removing process, the hard alloy can not be corroded even if the diamond composite sheet is not taken out in time, and the cobalt removing liquid can not infiltrate into the gap between the inner hole of the cobalt removing mold block and the excircle of the composite sheet to cause the corrosion of the, and the situation that the cobalt removing solution permeates into the hard alloy matrix of the composite sheet to cause the corrosion of the hard alloy of the composite sheet can not occur under the condition that the cobalt removing composite sheet is not taken out in time.

In a specific embodiment of the cobalt removing device for the diamond composite sheet, the height of an inner cavity of the cobalt removing die 1 for placing the diamond composite sheet 2 is larger than that of an excircle alloy part of the diamond composite sheet 2, so that the excircle alloy part of the diamond composite sheet 2 can be ensured to completely enter the cobalt removing die 1, the excircle alloy part is protected, and the cobalt removing die is ensured not to be corroded by a cobalt removing solution.

In another embodiment of the cobalt removing device for the diamond compact, the solution tank 4 has a scale mark for indicating the height of the fixture 3 in the height direction, so that the operation of containing the cobalt removing solution is more convenient, and the height of the added cobalt removing solution can be determined according to the required cobalt removing depth, which is a preferred scheme, but the scale mark may not be provided in other cases.

In another specific embodiment of the cobalt removing device for the diamond composite sheets, the fixture 3 can move up and down along the inner side surface of the solution tank 4, in this case, when different diamond composite sheets are replaced for cobalt removing, the cobalt removing liquid can be kept unchanged, the diamond composite sheets with different lengths can be placed at different heights to determine the proper cobalt removing positions, the specific arrangement mode is not limited, and the cobalt removing device can be similar to the combination of a grate of a steamed bread and a steamer, and a plurality of convex-to-inner annular ridges or concave-to-outer annular pits at different heights are arranged on the inner side surface of the solution tank 4, so that the fixture 3 can be fixed at positions at multiple heights.

One preferred scheme is that the cobalt removing mold 1 is a high-molecular plastic block mold, which belongs to various mixed materials of polytetrafluoroethylene and polyethylene, and the acid resistance effect of the materials is better, so that the materials are guaranteed not to be corroded.

Optionally, the shape of the fixture 3 is a long strip, and a plurality of cobalt removing molds may be arranged in parallel on each fixture 3, which may be selected according to actual needs, of course, the long strip is only a preferred scheme, and a square or other shape may also be selected according to actual needs, and is not limited herein.

In another preferred embodiment, the fixture 3 is connected with the cobalt removing die 1 in an interference fit manner, so that the fixture and the cobalt removing die can be stably connected, and can be taken out conveniently, and efficient operation is facilitated.

It will be appreciated by those skilled in the art that the cross-sectional shape of the decobalting die 1 may be circular or rectangular, depending on the shape of the diamond compact on which the decobalting is to be performed.

In conclusion, the cobalt removing device with the diamond compact can ensure that the alloy part is not corroded in the cobalt removing process, better cobalt removal effect can be achieved by the inverted placement of the composite sheet and the height of the composite layer of the composite sheet immersed in the cobalt removal liquid, the purpose of annular removal is realized, the requirements of the market on different cobalt removal depths can be met, the cobalt removal effect is stable, moreover, the current market needs a composite sheet with the lateral cobalt removal depth of the composite layer as deep as possible, the scheme can not only realize the requirement that the lateral cobalt removal depth of the composite layer is consistent with the middle cobalt removal depth, but also can adjust the cobalt removal time to realize the requirement that the lateral cobalt removal depth of the composite layer is greater than the middle cobalt removal depth, in addition, the device is simple to operate, and the security is good, and the cobalt removal is efficient, and the cobalt removal layer form is good, and the diamond compact's that the cobalt removal came out wearability and thermal stability are better.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The cobalt removing device for the diamond composite sheets is characterized by comprising a solution tank, wherein a clamp spanning the solution tank is arranged on the inner side surface of the solution tank, a cobalt removing mold with an opening at the lower end is fixed on the clamp, the inner surface of the cobalt removing mold and the diamond composite sheets positioned at the lower part of the composite layers form interference fit, and the clamp can independently immerse the composite layers of the diamond composite sheets into cobalt removing liquid in the solution tank;

the height direction of the solution tank is provided with a scale mark for indicating the placing height of the fixture;

the fixture can move up and down along the inner side surface of the solution tank.

2. The cobalt removing device for the diamond compact as claimed in claim 1, wherein the cobalt removing mold is used for placing the inner cavity of the diamond compact with a height greater than that of the outer circle alloy part of the diamond compact.

3. The apparatus of any one of claims 1-2, wherein the decobalting mold is a polymer plastic block mold.

4. The apparatus of any one of claims 1-2, wherein the clip is in the shape of an elongated strip.

5. The apparatus of any one of claims 1-2, wherein the fixture is in interference fit with the decobalting mold.

6. The apparatus of any one of claims 1-2, wherein the cross-sectional shape of the decobalting die is circular or rectangular.