CN217095668U

CN217095668U - Die for pressureless sintering diamond reamer of intermediate frequency furnace

Info

Publication number: CN217095668U
Application number: CN202220822801.6U
Authority: CN
Inventors: 李俊萍; 胡立
Original assignee: Institute of Exploration Technology Chinese Academy of Geological Sciences
Current assignee: Chengdu Huajian Geological Engineering Technology Co ltd
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-08-02
Anticipated expiration: 2032-04-11

Abstract

The utility model relates to a mould for intermediate frequency furnace non-pressure sintering diamond reamer, include: the outer mold is provided with an inner bushing, the inner wall of the inner bushing is connected with a water gap occupying strip, the inner side below the outer mold is connected with a steel body, the inner bushing is connected with a step on the outer side of the middle of the steel body, the side wall of the top end of the steel body is provided with a lifting groove, and the lifting groove is connected with an overlapping ring. Through the combination of the outer mold, the inner bushing and the nozzle occupying strip arranged in the device, the expansion stress can be transmitted to the inner bushing through the matrix powder in the sintering process, a proper amount of tolerance is arranged between the inner bushing and the outer mold to release the expansion stress, the difference of the expansion stress is greatly reduced, the expansion crack phenomenon of the reamer mold is eliminated, meanwhile, the nozzle occupying strip can be convenient to leave a prefabricated groove on the sintered matrix, and water flow is facilitated.

Description

Die for pressureless sintering diamond reamer of intermediate frequency furnace

Technical Field

The utility model belongs to the mould field of firing, concretely relates to intermediate frequency furnace non-pressure sintering mould for diamond reamer.

Background

The mould firing means that the material is made into a specific prefabricated pattern, the material is fired in the mould to form the shape of a mould prefabricated space, so that the most common manufacturing tool in the existing metal equipment component is made, and in the firing process of the existing mould for the diamond reamer, because the expansion coefficient difference among the steel body, the metal powder matrix and the mould is large and the limitation of the mould space is added, the mould is easy to damage due to deformation extrusion caused by expansion of the metal powder in the sintering process, and the quality of a sintered finished product is easy to reduce.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a mould for intermediate frequency furnace non-pressure sintering diamond reamer plans to solve current mould for diamond reamer because the coefficient of expansion difference between the steel body and metal powder matrix, the mould three is big, leads to firing easily because the inflation leads to the technical problem that its mould damaged.

In order to solve the technical problem, the utility model discloses a technical scheme as follows, a mould for intermediate frequency furnace non-pressure sintering diamond reamer, include: the outer mold is provided with an inner bushing, the inner wall of the inner bushing is connected with a water gap occupying strip, a steel body is connected below the outer mold, the side wall of the top end of the steel body is provided with a lifting groove, and an overlapping ring is connected in the lifting groove.

By adding the independent nesting of the inner bushing, the expansion stress is transmitted to the inner bushing through the tire body powder, and a proper tolerance is arranged between the inner bushing and the outer mold to release the expansion stress, so that the difference of the expansion stress is reduced, and the sintering rejection rate of the reamer is greatly reduced. Meanwhile, the reamer mold is positioned, the phenomenon that the low-melting-point powder material is lost in the sintering process is effectively prevented, demolding is facilitated, the mold structure is further simplified, and the production cost is reduced.

Furthermore, the inner lining is nested on the inner wall of the outer mold, and the water gap occupying strips are uniformly distributed on the inner wall of the inner lining.

Furthermore, the inner wall of the upper end of the outer die is open.

Furthermore, the outer mold, the inner bushing and the nozzle spacer are arranged in a matched manner.

Further, the inside bottom of lift inslot is provided with the dovetail groove, and the overlap ring overlaps for the several ring and cup joints the setting, and every high disparity of overlap ring, and overlap ring bottom and dovetail groove and cooperate.

Through the trapezoidal groove in the above-mentioned content can let the separation of the screw thread annular groove setting of overlapping ring bottom, can not carry out mutual influence.

Furthermore, a thread ring groove is formed in the inner wall of the overlapping ring close to the bottom end, a rotating thread is arranged at the bottom end of the outer wall of the overlapping ring, the thread ring groove is matched with the thread ring groove, and the top end of the overlapping ring is connected with an embedded ring.

Through the independent shrinkage of the overlapping ring in the above content, the space size between the steel body and the inner lining can be changed at will, so that the scale of the fired reamer can be changed more flexibly.

Furthermore, a limiting groove is formed in the outer wall of the overlapping ring close to the top end, an embedding ring is movably connected to the inner wall of the overlapping ring close to the top end, the limiting groove is matched with the embedding ring, one end of the embedding ring protrudes into a groove formed in the overlapping ring and connected with the embedding ring, transmission tooth marks are arranged on two sides of the embedding ring, and the transmission tooth marks are meshed with the protruding portion of the embedding ring.

The beneficial effects of the utility model include:

1. through the external mold that sets up in the device, the combination of endotheca and mouth of a river occupy-place strip, can pass through the matrix powder at sintering in-process expansion stress and transmit the endotheca, set up proper amount tolerance between endotheca and the external mold and make expansion stress release, the difference of expansion stress has been reduced greatly, can carry out certain extrusion deformation to the mould on every side when the filler of endotheca and steel body takes place to expand in sintering shaping, carry out certain expansion stress release, when deformation certain degree and expansion stress are in release part, injectd the mould of having released partial expansion stress and injectd the offset in injecing through the restraint of endotheca and external mold, prevent that the mould from leading to the damage because of the continuous extrusion of expansion stress, the mouth of a river occupy-place strip can be convenient leaves prefabricated recess on the matrix of sintering simultaneously, be convenient for rivers to pass through.

2. The device still is provided with the overlapping ring, changes the clearance between its steel body and the interior bush through the independent shrink of overlapping ring for the matrix thickness that the sintering was out can change, thereby makes the scale that the matrix sintering was out can change, lets its more nimble in the sintering, and can not need the loaded down with trivial details step of changing different moulds when sintering the enlarger of different thickness scales.

To sum up, the utility model provides a sintering mold can solve because the coefficient of expansion difference between the steel body and metal powder matrix, the mould three is big, leads to leading to its easy emergence damage to the extrusion of mould when taking place the inflation, reduces the problem of firing the quality.

Drawings

Fig. 1 is a schematic side view of the cross-sectional structure of the present invention.

Fig. 2 is an enlarged schematic structural diagram of a point a in fig. 1 according to the present invention.

Fig. 3 is a schematic view of the local side view profile structure of the steel body of the present invention.

Fig. 4 is a schematic diagram of the separation structure of the overlapping ring of the present invention.

Fig. 5 is a schematic view of the connection structure of the overlapping ring and the embedded ring of the present invention.

Fig. 6 is a perspective view of the limiting groove and the limiting ring according to the present invention.

Description of reference numerals:

the outer die 1, the inner bushing 2, the nozzle occupying strip 3, the steel body 4, the lifting groove 401, the trapezoidal groove 4011, the overlapping ring 402, the thread ring groove 4021, the rotating thread 4022, the limiting groove 4023, the limiting ring 4024, the embedding ring 403 and the transmission tooth trace 4031.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of embodiments of the present application, generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

Referring to the attached drawings 1-6, the die for the pressureless sintering diamond reamer of the intermediate frequency furnace comprises: the outer mold 1 is provided with an inner bushing 2 in the outer mold 1, the inner wall of the inner bushing 2 is connected with a water gap occupying strip 3, a steel body 4 is arranged below the outer mold 1, the inner bushing 2 is connected with the outer side step of the middle of the steel body 4, a lifting groove 401 is formed in the side wall of the top end of the steel body 4, and an overlapping ring 402 is connected in the lifting groove 401. The inner diameter and the outer diameter of the steel body are phi 75mm and phi 110mm, and the height of the outer diameter part of the steel body is 80mm-90 mm.

The inner lining 2 is nested on the inner wall of the outer mould 1, and the water gap occupying strips 3 are uniformly distributed on the inner wall of the inner lining 2. The height of an effective matrix of the reamer is designed to be 30-45 mm, the height of the inner bushing and the nozzle spacer is 30-45 mm, the nesting height of the inner wall of the outer mold and the inner bushing is 30-45 mm, the total height of the outer mold is set to be 60-90 mm, and the upper end of the inner wall of the outer mold is open, so that powder can be conveniently filled. The outer diameter of the outer die is set to be 150mm-170mm, the wall thickness of the outer die is 20mm-35mm, and the outer diameter of the inner lining is tightly matched with the inner diameter of the outer die. The inner diameter of the inner bushing and the diameter of the water gap occupying strip are determined by the diameter of the reamer and the depth of the water gap, the outer diameter of the reamer is phi 96mm, the inner diameter of the inner bushing is phi 96.7 mm-phi 98mm by integrating the shrinkage after the die is sintered, and the outer diameter of the water gap occupying strip is adaptive to the inner diameter of the inner bushing and is in tight fit with the inner diameter of the inner bushing.

Wherein, the inner wall of the upper end of the outer die 1 is arranged in an opening way.

Wherein, the outer mold 1, the inner bushing 2 and the nozzle spacer 3 are arranged in a matching way. The maximum outer diameter of the steel body is set to be a slope-shaped section, and the slope-shaped section is matched with the outer die, so that the phenomenon that the low-melting-point powder material runs off in the sintering process can be effectively prevented while the centering effect of the steel body of the reamer is achieved, the demoulding is facilitated, the die structure is further simplified, and the production cost is reduced.

The inner bushing is nested in the inner cavity of the outer mold, water gap occupying strips are uniformly distributed on the inner wall of the inner bushing, and polycrystalline diamond or diamond particles are arranged in empty grooves among the water gap occupying strips. The inner bushing, the nozzle occupying strip and the outer mold are respectively and independently arranged, in the sintering process of the intermediate frequency furnace, the expansion coefficient difference of the reamer steel body, the matrix powder and the mold is large, the expansion stress is transmitted to the inner bushing through the matrix powder, and a proper amount of tolerance is arranged between the inner bushing and the outer mold to release the expansion stress, so that the difference of the expansion stress is greatly reduced, and the phenomenon of the expansion crack of the reamer mold is eliminated. And after the reamer is sintered and completely cooled, the shrinkage of the matrix of the reamer is greater than that of the mold, so that a certain amount of annular space exists between the matrix and the inner bushing, the inner bushing is not damaged when the reamer is demolded, the repeated utilization rate of the mold is improved, and the production cost is reduced.

Wherein, the inside bottom in lift groove 401 is provided with dovetail groove 4011, overlaps ring 402 and overlaps for several rings overlap and cup joint the setting, and every highly differs of overlapping ring 402, and overlaps ring 402 bottom and dovetail groove 4011 and cooperate.

The inner wall of the overlapping ring 402 is provided with a thread ring groove 4021 near the bottom end, the bottom end of the outer wall of the overlapping ring 402 is provided with a rotary thread 4022, the thread ring groove 4021 is matched with the thread ring groove 4021, and the top end of the overlapping ring 402 is connected with the embedded ring 403.

Wherein, the outer wall of the overlapping ring 402 is provided with a limiting groove 4023 near the top end, the inner wall of the overlapping ring 402 is movably connected with an embedding ring 403 near the top end, the limiting groove 4023 is matched with the embedding ring 403, one end part of the embedding ring 403 is protruded in a groove of the overlapping ring 402 connected with the embedding ring 403, two sides of the embedding ring 403 are provided with transmission tooth marks 4031, and the transmission tooth marks 4031 are meshed with the protruded part of the embedding ring 403.

The specific working principle is as follows: firstly, powder to be sintered is filled into a gap between the inner lining 2 and the steel body 4 from an opening of the outer die 1, then the powder is sintered at high temperature, and meanwhile, when the powder is poured into the gap between the inner lining 2 and the steel body 4, the inner wall of the inner lining 2 is connected with the water gap occupying strip 3 on the surface of the inner wall in advance, so that a lug with any shape is formed on the inner wall of the inner lining 2, a groove is formed when the powder is filled between the inner lining 2 and the steel body 4 and sintered and molded, and water flow is facilitated. Meanwhile, in the sintering process of the intermediate frequency furnace, the expansion coefficient difference of the steel body, the matrix powder and the mould of the reamer is large, the expansion stress is transmitted to the inner bushing 2 through the matrix powder, a proper amount of tolerance is arranged between the inner bushing 2 and the outer mould 1 to release the expansion stress, the difference of the expansion stress is greatly reduced, the expansion crack phenomenon of the mould of the reamer is eliminated, when the fillers of the inner bushing 2 and the steel body 4 expand during sintering molding, certain extrusion deformation is carried out on the surrounding mould to release certain expansion stress, when the deformation is certain and the expansion stress is at a release part, the mould releasing part of the expansion stress is limited and offset through the constraint limitation of the inner bushing 2 and the outer mould 1, the mould is prevented from being damaged due to the continuous extrusion of the expansion stress, the shrinkage of the matrix of the reamer is larger than the shrinkage of the mould after the sintering is finished, a certain amount of annular space is reserved between the tire body and the inner bushing 2, the inner bushing is not damaged when the reamer is demoulded, the repeated utilization rate of the mold is improved, and the production cost is reduced. Meanwhile, when powder is filled between the inner bushing 2 and the steel body 4 and sintered, the embedded rings 403 on the overlapped rings 402 in the steel body 4 can be manually pressed by applying force, so that one of the overlapped rings 402 can be contracted into the lifting groove 401, the overlapped rings 402 can rotate when being pressed downwards due to the matching of the rotating threads 4022 at the bottom end of the overlapped ring 402 and the thread ring grooves 4021, meanwhile, the embedded rings 403 at the top end of the embedded rings are limited by the friction of the manual pressing, so that the embedded rings 403 can not be driven to rotate, the overlapped rings 402 which are overlapped and sleeved together can be sequentially and freely contracted downwards on one side to enlarge the gap between the inner bushing 2 and the steel body 4, so as to control the thickness of the reamer during sintering to carry out certain control, so as to facilitate the sintering of reamers with different carcass thicknesses, and finally, when the overlapped rings 402 rotate downwards, when the inner wall limiting ring 4024 protrudes to one side of the groove of the connecting snap ring 403, the inner wall limiting ring 4024 is engaged with the surface of the driving tooth mark 4031 on the snap ring 403, so that the snap ring 403 is driven to rotate and contract into the inner portion of the overlap ring 402 when the overlap ring 402 rotates and moves downwards, and the portion engaged in the limiting groove 4023 is also moved out along the annular inclined surface of the limiting groove 4023, so that the overlap ring 402 can be separated from the other overlap ring 402, and because the annular inclined surface of the limiting groove 4023 is limited by the connection with the snap ring 403, when one of the overlap rings 402 rotates and moves downwards, the other overlap ring 402 cannot be easily driven to move downwards due to friction, so that the overlapped overlap rings 402 can also form independent downward movement when being engaged with each other.

The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.

Claims

1. The utility model provides a mould for intermediate frequency furnace pressureless sintering diamond reamer which characterized in that includes: external mold (1), be provided with interior bush (2) in external mold (1), interior bush (2) wall connection has mouth of a river occupy-place strip (3), the below of external mold (1) is provided with steel body (4), interior bush (2) nestification is on the inner wall of external mold (1), mouth of a river occupy-place strip (3) equipartition is on the inner wall of internal bush (2), external mold (1) upper end inner wall is uncovered setting, can dismantle the connection between external mold (1), interior bush (2) and mouth of a river occupy-place strip (3).

2. The die for the intermediate frequency furnace pressureless sintering diamond reamer as claimed in claim 1, wherein the side wall of the top end of the steel body (4) is provided with a lifting groove (401), an overlapping ring (402) is connected in the lifting groove (401), the bottom end inside the lifting groove (401) is provided with a trapezoidal groove (4011), the overlapping ring (402) is arranged in a manner that a plurality of circular rings are overlapped and sleeved, the height of each overlapping ring (402) is different, and the bottom end of the overlapping ring (402) is matched with the trapezoidal groove (4011).

3. The die for the pressureless sintered diamond reamer of the intermediate frequency furnace is characterized in that a threaded ring groove (4021) is formed in the inner wall of the overlapping ring (402) close to the bottom end, a rotating thread (4022) is formed in the bottom end of the outer wall of the overlapping ring (402), the threaded ring groove (4021) is matched with the threaded ring groove (4021), and a snap ring (403) is connected to the top end of the overlapping ring (402).

4. The die for the pressureless sintered diamond reamer of the intermediate frequency furnace is characterized in that a limiting groove (4023) is formed in the outer wall of the overlapping ring (402) close to the top end, a snap ring (403) is movably connected to the inner wall of the overlapping ring (402) close to the top end, the limiting groove (4023) is matched with the snap ring (403), one end of the snap ring (403) protrudes partially into a groove formed in the overlapping ring (402) and connected with the snap ring (403), transmission tooth marks (4031) are formed in two sides of the snap ring (403), and the transmission tooth marks (4031) are meshed with the protruding portion of the snap ring (403).