CN212217082U - Diamond bit production mould - Google Patents
Diamond bit production mould Download PDFInfo
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- CN212217082U CN212217082U CN202020345489.7U CN202020345489U CN212217082U CN 212217082 U CN212217082 U CN 212217082U CN 202020345489 U CN202020345489 U CN 202020345489U CN 212217082 U CN212217082 U CN 212217082U
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- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 70
- 239000010432 diamond Substances 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 144
- 239000010959 steel Substances 0.000 claims abstract description 144
- 238000005245 sintering Methods 0.000 claims abstract description 71
- 239000000843 powder Substances 0.000 claims abstract description 35
- 239000011159 matrix material Substances 0.000 claims abstract description 29
- 238000007731 hot pressing Methods 0.000 claims abstract description 27
- 239000000956 alloy Substances 0.000 claims abstract description 15
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 238000005520 cutting process Methods 0.000 claims abstract description 13
- 238000004321 preservation Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 8
- 229910002804 graphite Inorganic materials 0.000 description 10
- 239000010439 graphite Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005056 compaction Methods 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model belongs to the technical field of hot pressing diamond bit manufacture equipment technique and specifically relates to a diamond bit production mould and diamond bit are related to. The diamond bit production mold comprises a bottom mold, a core mold and a steel body; the bottom die is used for placing the diamond cutting body and the matrix alloy powder; the core mold comprises a cylindrical section and a circular table section, the cylindrical section is fixedly connected with the bottom mold, the circular table section is fixedly connected with the cylindrical section, and the lower bottom of the circular table section is superposed with the upper surface of the cylindrical section; the steel body can be sleeved on the circular platform section, and the steel bodyThe lower end of the circular truncated cone is arranged between the two ends of the circular truncated cone section in an initial state, and the lower end of the circular truncated cone section is arranged at the joint of the circular truncated cone section and the cylindrical section when the circular truncated cone section is cooled to normal temperature after being sintered; the taper of the circular table section is K, K is 2XConventional high temperature:HDescend. By designing the circular truncated cone section with proper taper, the actual size of the gap between the steel body and the core mold at the high-temperature stage can be reduced as much as possible, so that the leakage phenomenon of sintering pressure can be effectively relieved, and the loss of a large amount of bonding materials in the tire body is reduced.
Description
Technical Field
The utility model belongs to the technical field of hot pressing diamond bit manufacture equipment technique and specifically relates to a diamond bit production mould is related to.
Background
The hot-pressing diamond bit is the most widely applied tool in drilling at present, and the gauge protection capability is an important aspect of the performance of the diamond bit.
At present, in the production of a conventional hot-pressing diamond drill bit, graphite is made into a cylindrical core mold, No. 45 steel is made into a hollow cylindrical steel body, a diamond cutting body and matrix powder are filled between a bottom mold and the core mold, then the steel body is pressed in, at the moment, the steel body is completely sleeved on the core mold, an assembly gap is formed between the steel body and the core mold, and then hot-pressing sintering is carried out. The hot-pressing sintering process is to gradually increase the sintering pressure along with the temperature rise until finally the constant temperature and the constant pressure are maintained for sintering. Along with the temperature rise, the pressure also rises gradually, the sintered matrix powder shrinks gradually, the height is reduced, and the steel body descends along the pressure direction; the steel body gradually expands along with the rise of temperature, the inner diameter gradually increases, and because the thermal expansion coefficient of the No. 45 steel is far larger than that of graphite, the gap between the steel body and the core mold increases along with the rise of temperature, so that the serious leakage of sintering pressure and the loss of a large amount of bonding materials in the matrix are caused, the component change of the matrix is serious, the inner diameter strength and the wear resistance of a finished drill bit are finally reduced, and the bonding capability of diamond and superhard gauge protection materials is influenced.
In the prior art, the diameter of the core mold is dCore mould，
Wherein d is0To the inner diameter of the diamond bit to be produced, alphaTyre bodyIs the expansion coefficient of the matrix alloy, alphaGraphite (II)Is the coefficient of expansion of graphite, tCoagulationThe freezing point temperature t of the drill bit matrix alloy in the hot-pressing sintering cooling stageAt normal temperatureIs at a normal temperature;
at normal temperature, the inner diameter of the lower end of the steel body is dConventional steel body，dConventional steel body＝dCore mould+2XAssemblyWherein X isAssemblyIs an assembly gap between the inner wall of the steel body and the outer wall of the core mould before temperature rise sintering;
the diameter of the steel body after thermal expansion at the highest heat preservation stage of hot-pressing sintering is dHigh temperature of steel body，dHigh temperature of steel body＝dConventional steel body[1+αSteel body(tSintering-tAt normal temperature)]Wherein α isSteel bodyIs the coefficient of expansion of the steel body, tSinteringThe temperature of the highest heat preservation stage of the hot-pressing sintering is adopted; the diameter of the core mold after thermal expansion at the highest heat preservation stage of hot-pressing sintering is dCore mold high temperature，dCore mold high temperature＝dCore mould[1+αGraphite (II)(tSintering-tAt normal temperature)](ii) a At the highest heat-preservation stage of hot-pressing sintering, the clearance between the steel body and the core mold is XConventional high temperature，
2XConventional high temperature＝dHigh temperature of steel body-dCore mold high temperature
＝dCore mould(αSteel body-αGraphite (II))·(tSintering-tAt normal temperature)+2XAssembly·αSteel body·(tSintering-tAt normal temperature)
It can be seen that with tSinteringIncrease of (2), XConventional high temperatureIt will increase significantly.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a diamond bit production mould to alleviate the sintering in-process that exists among the prior art, the clearance between the steel body and the mandrel increases along with the temperature rise, leads to sintering pressure to seriously leak and matrix in the technical problem that bonding material runs off in a large number.
Based on the purpose, the utility model provides a diamond bit production mold, which comprises a bottom mold, a core mold and a steel body; the bottom die is used for placing the diamond cutting body and the matrix alloy powder; the core die comprises a cylindrical section and a circular table section, the cylindrical section is fixedly connected with the bottom die, the circular table section is fixedly connected with the cylindrical section, and the lower bottom of the circular table section is superposed with the upper surface of the cylindrical section; the steel body can be sleeved on the circular table section, the lower end of the steel body is arranged between two ends of the circular table section in an initial state, and the lower end of the steel body is arranged at the connecting position of the circular table section and the cylindrical section when the steel body is cooled to a normal temperature state after sintering;
the taper of the circular platform section is K, and K is 2XConventional high temperature:HDescendWherein X isConventional high temperatureA gap H between the steel body and the core mold at the highest heat preservation stage of hot-pressing sinteringDescendThe height of the steel body which descends after hot-pressing sintering, HDescend＝aHTyre body，HTyre bodyThe height of a working layer of the diamond drill bit to be processed is defined as a coefficient, and the range of a is 1.5-2.
Further, in some optional embodiments, the steel body comprises an equal-diameter section and an expanding section which are integrally formed, the equal-diameter section is located above the expanding section, the inner diameter of the equal-diameter section is equal to the minimum inner diameter of the expanding section, in the initial state, the maximum inner diameter of the expanding section is smaller than the maximum outer diameter of the circular platform section of the core mold, and an assembly gap is formed between the inner wall of the expanding section and the outer wall of the circular platform section.
Further, in certain alternative embodiments, in the hot press sintering highest heat preservation stage, a gap between an inner wall of the expanded diameter section of the steel body and an outer wall of the circular truncated cone section of the core mold is not greater than the fitting gap.
Further, in some optional embodiments, a gap is provided between the outer wall of the steel body and the inner wall of the bottom die.
Further, in certain optional embodiments, in the hot-pressing sintering highest heat preservation stage, a gap is formed between the inner wall of the diameter-expanded section of the steel body and the outer wall of the circular truncated cone section of the core mold.
Further, in some optional embodiments, the bottom die is a circular groove, and the cylindrical section is fixedly installed on the upper surface of the bottom of the circular groove;
the diamond cutting machine further comprises a bottom ring, wherein the bottom ring is fixedly installed on the upper surface of the bottom of the circular groove, and an annular groove for placing diamond cutting bodies and matrix powder is formed among the outer wall of the core mold, the upper surface of the bottom ring and the inner wall of the circular groove.
Further, in some alternative embodiments, the center line of the cylindrical section passes through the center of the bottom die.
Further, in some optional embodiments, the lower end surface of the steel body is serrated.
Further, in some optional embodiments, the upper end surface of the circular platform section is provided with a chamfer, and the lower end surface of the steel body is provided with a chamfer.
Compared with the prior art, the beneficial effects of the utility model mainly lie in:
based on this structure, the utility model provides a diamond bit production mould, when using, places diamond cutting body and matrix powder in the die block, the compaction, then establish the steel body cover on the round platform section, under initial condition, also be exactly under not carrying out the high temperature sintering state, the lower extreme of the steel body is located between the both ends of round platform section, along with the temperature risees, pressure also is carried outGradually rising, gradually contracting the sintered matrix powder, reducing the height, and reducing the height of the sintered steel body to HDescendSimultaneously, along with the temperature rising, the steel body inflation, the internal diameter increase of the steel body for the steel body can move to the direction that is close to the cylinder section along the lateral wall of round platform section, that is to say, along with the internal diameter increase of steel body, the inner wall of steel body pastes the lateral wall of round platform section and moves to the direction that is close to the cylinder section, and under the room temperature state, the lower extreme of steel body was located the junction of round platform section and cylinder section until falling after the sintering. Estimating theoretical X according to production requirements, e.g. according to the inner diameter, matrix properties and raw material properties of the diamond bit to be producedConventional high temperatureAnd HDescendThen according to K ═ 2XConventional high temperature:HDescendAnd the tapering of calculating the round platform section is obtained, consequently, is adopting the utility model provides an in the high temperature sintering process of diamond bit production mould production diamond bit, have suitable tapering round platform section through the design, can reduce the actual size in clearance between the high temperature stage steel body and the mandrel as far as possible to can effectively alleviate sintering pressure's leakage phenomenon, reduce bonding material's a large amount of losses in the matrix.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram (initial state) of a diamond bit production mold according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram (high-temperature high-pressure sintering state) of a diamond bit production mold according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a diamond bit production mold according to an embodiment of the present invention (cooled to normal temperature after sintering);
fig. 4 is a schematic structural diagram of a steel body in a diamond bit production mold according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a diamond bit produced by using the diamond bit production mold according to the first embodiment of the present invention in an unprocessed state.
Icon: 100-bottom ring; 101-bottom die; 102-a mandrel; 103-a steel body; 104-a cylindrical section; 105-a frustum section; 106-constant diameter section; 107-expanding section; 108-saw teeth.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
Example one
Referring to fig. 1 to 5, the present embodiment provides a mold for producing a diamond drill bit, including a bottom mold 101, a core mold 102, and a steel body 103; the bottom die 101 is used for placing the diamond cutting body and the matrix alloy powder; the core mold 102 comprises a cylindrical section 104 and a circular truncated cone section 105, the cylindrical section 104 is fixedly connected with the bottom mold 101, the circular truncated cone section 105 is fixedly connected with the cylindrical section 104, and the lower bottom of the circular truncated cone section 105 is superposed with the upper surface of the cylindrical section 104; the steel body 103 can be sleeved on the circular platform section 105, the steel body 103 is configured in such a way that the lower end of the steel body is positioned between two ends of the circular platform section 105 in an initial state, and the lower end of the steel body is positioned at the joint of the circular platform section 105 and the cylindrical section 104 when the steel body is cooled to the normal temperature after sintering; the taper of the truncated cone section 105 is K, K being 2XConventional high temperature:HDescendWherein X isConventional high temperatureA gap H between the steel body 103 and the core mold 102 at the highest heat preservation stage of hot-pressing sinteringDescendThe height of the steel body 103 which is lowered after hot-pressing sintering, HDescend＝aHTyre body，HTyre bodyThe height of a working layer of the diamond drill bit to be processed is defined as a coefficient, and the range of a is 1.5-2.
Based on this structure, the embodiment of the utility model provides a diamond bit production mould, when using, place diamond cutting body and matrix powder in die block 101, the compaction, then establish steel body 103 cover on round platform section 105, under initial condition, also be exactly under not carrying out the high temperature sintering state, the lower extreme of steel body 103 is located between the both ends of round platform section 105, along with the temperature rise, pressure also progressively rises, by the gradual shrink of sintered matrix powder, height reduction, the height that descends after steel body 103 sintering is H for the height of steel body 103 sinteringDescendMeanwhile, as the temperature rises, the steel body 103 expands, and the inner diameter of the steel body 103 increases, so that the steel body 103 can move along the side wall of the truncated cone section 105 toward the direction close to the cylindrical section 104, that is, as the inner diameter of the steel body 103 increases, the inner wall of the steel body 103 moves along the direction close to the cylindrical section 104 against the side wall of the truncated cone section 105 until the lower end of the steel body 103 is located at the connection position of the truncated cone section 105 and the cylindrical section 104 when the temperature is reduced to the normal temperature state after sintering. Estimating theoretical X according to production requirements, e.g. according to the inner diameter, matrix properties and raw material properties of the diamond bit to be producedConventional high temperatureAnd HDescendThen according to K ═ 2XConventional high temperature:HDescendAnd calculate the tapering of deriving round platform section 105, consequently, adopt the utility model provides an in the high temperature sintering process of diamond bit production mould production diamond bit, have suitable tapering round platform section 105 through the design, can reduce the actual size in clearance between high temperature stage steel body 103 and the mandrel 102 as far as possible to can effectively alleviate sintering pressure's leakage phenomenon, reduce bonding material's a large amount of losses in the matrix.
It should be understood that the steel body 103 of this embodiment is not recycled, but that each time a diamond bit is produced, a steel body 103 is used, and after sintering, the steel body 103 is integrated with the matrix to constitute the diamond bit. The next time the diamond bit is to be produced, a new steel body 103 needs to be used.
In some alternative embodiments, the steel body 103 comprises an equal-diameter section 106 and an expanded-diameter section 107 which are integrally formed, the equal-diameter section 106 is positioned above the expanded-diameter section 107, the inner diameter of the equal-diameter section 106 is equal to the minimum inner diameter of the expanded-diameter section 107, the maximum inner diameter of the expanded-diameter section 107 is smaller than the maximum outer diameter of the circular truncated cone section 105 of the core mold 102 in an initial state, and an assembly gap is formed between the inner wall of the expanded-diameter section 107 and the outer wall of the circular truncated cone section 105.
In this embodiment, the expanding section 107 is a hollow circular truncated cone, and the taper of the hollow circular truncated cone is equal to the taper of the circular truncated cone section 105. In an initial state, the maximum inner diameter of the expanding section 107 is smaller than the maximum outer diameter of the truncated cone section 105 of the core mold 102, and an assembly gap is formed between the inner wall of the expanding section 107 and the outer wall of the truncated cone section 105, so that the lower end of the steel body 103 can be ensured to be positioned between the two ends of the truncated cone section 105 of the core mold 102.
In an initial state, the inner diameter of the lower end of the steel body is d'Steel body，d'Steel body＝dConventional steel body-2XConventional high temperature(ii) a Wherein,
wherein d is0To the inner diameter of the diamond bit to be produced, alphaTyre bodyIs the expansion coefficient of the matrix alloy, alphaGraphite (II)Is the coefficient of expansion of graphite, tCoagulationThe freezing point temperature t of the drill bit matrix alloy in the hot-pressing sintering cooling stageAt normal temperatureIs at a normal temperature; xConventional high temperatureThe gap between the steel body and the core mould is the gap between the steel body and the core mould at the highest heat preservation stage of hot-pressing sintering in the prior art; xAssemblyIs an assembly gap between the inner wall of the steel body and the outer wall of the core mould before temperature rise sintering; dConventional steel bodyThe inner diameter of the lower end of the steel body in the initial state in the prior art; in the initial state, the diameter of the cylindrical section of the core mold is dCylindrical section，dCylindrical section＝dCore mouldThe diameter of the core mold after thermal expansion at the highest heat preservation stage of hot-pressing sintering is d'Core mold high temperature，d'Core mold high temperature＝dCore mold high temperature＝dCore mould[1+αGraphite (II)(tSintering-tAt normal temperature)](ii) a The steel body has a diameter d 'after thermal expansion at the highest heat preservation stage of hot-pressing sintering'High temperature of steel body，d'High temperature of steel body＝[1+αSteel body(tSintering-tAt normal temperature)]×(dCore mould+2XAssembly-2XConventional high temperature) Wherein α isSteel bodyIs the coefficient of expansion of the steel body, tSinteringThe temperature of the highest heat preservation stage of the hot-pressing sintering is adopted; 2XHigh temperature of patent＝d'High temperature of steel body-d'Core mold high temperature。
αTyre body＝∑(αElement(s)X% by weight) calculated with alphaSteel bodyClose to, tCoagulationUsually 820 ℃ to 880 ℃ tAt normal temperatureCalculated at 20 ℃ of alphaGraphite (II)Is 2x 10-6/℃，αSteel bodyIs 15.5 multiplied by 10-6/℃，tSinteringUsually, the temperature is controlled to be 900-950 ℃, but because the temperature control often does not reach an ideal state, the instant temperature exceeds the heat preservation range by about 20 ℃ very generally, so that the t is calculated theoreticallySinteringCalculated at 960 ℃.
In the prior art, as the inner diameter of the diamond bit increases, XConventional high temperatureThe increase is more. E.g. using existing moulds for producing d0Is a 80mm diamond drill bit, XAssemblySet to 0.1mm, the gap between the steel body 103 and the core mold 102 increases from 0.1mm to 0.618mm at the high sintering temperature stage, in which case a large sintering pressure powder leakage occurs.
In the embodiment, by designing the circular truncated cone section 105 with a proper taper and matching with the design at normal temperature, the inner diameter d ' of the lower end of the steel body 103 and the diameter d ' of the steel body 103 after thermal expansion in the highest heat preservation stage of hot-pressing sintering are designed 'High temperature of steel bodyThe actual size of the gap between the steel body 103 and the core mold 102 at the high temperature stage can be reduced as much as possible, so that the leakage phenomenon of the sintering pressure can be effectively relieved, and the loss of a large amount of bonding materials in the tire body can be reduced.
In this example, 2XHigh temperature of patent＝d'High temperature of steel body-d'Core mold high temperatureSubstituting the calculation to obtain:
2Xhigh temperature of patent＝2XAssembly·[1+αSteel body(tSintering-tAt normal temperature)]-2XConventional high temperature·αSteel body(tSintering-tAt normal temperature) In factDue to αSteel bodyIs 15.5 multiplied by 10-6/℃，αSteel body(tSintering-tAt normal temperature) Of the order of 103At present, the inner diameter of the hot-pressing diamond drill bit is generally within 300mm, so that X is ensuredConventional high temperatureLess than 4. Thus, 2X in the present embodimentHigh temperature of patentApproximately equal to 2.03XAssembly-3×10-2XConventional high temperatureI.e. XHigh temperature of patent＝1.015XAssembly-0.015XConventional high temperatureWherein X isAssembly>XHigh temperature of patent>0。
During pre-sintering assembly of the drill bit, a light hammer is typically applied to the powder particle population to achieve a maximum bulk density of the powder, referred to as the powder compaction density, designated as ρPowder of(ii) a The density of the alloy forming the matrix after sintering is increased and is recorded as rhoTyre body. The powder compaction density depends on the density of the raw material, and largely depends on the shape of the powder particles, the particle size and the particle size distribution, the degree of dryness (water content), the surface state of the powder particles, and the like. The bulk density of the irregularly shaped powder is lower than that of the regularly shaped powder; the more irregular the shape of the powder, the lower the apparent density, one of the reasons for this is that the more irregular the powder, the larger its specific surface area, the greater the friction between the particles, and therefore the lower the apparent density; also, the smaller the powder particles, the larger the specific surface area thereof, and therefore the finer the powder has a lower apparent density. Thus ρPowder ofAnd rhoTyre bodyThe relationship between them is different. RhoPowder ofAnd rhoTyre bodyThe variation therebetween is represented by a variation in the height of the sintered body of the carcass powder, called the height shrinkage ratio, which is the height of the sintered body of the carcass powder after assembly: height of the sintered carcass.
According to the manufacturing experience of the drill bit for many years, the high shrinkage ratio is 2.5-3, and after specific parameters are substituted, K is (0.013 d)Core mould+2.03XAssembly):HDescend。
It should be understood that in actual production, due to different stratum and drilling requirements of bit matrix performance, bit matrix formulations are many, component composition changes are many, and powder characteristics change due to changes of purchasing channelsTransformation, HDescendThe density relationship and H before and after the actual alloy sinteringTyre bodyAdjustment, XAssemblyThe mandrel 102 needs to be specifically designed to accommodate the actual machining accuracy, i.e., to produce each particular drill bit.
In some alternative embodiments, the inner wall of the expanded diameter section 107 of the steel body 103 and the outer wall of the frustum section 105 of the mandrel 102 are spaced apart during the hot press sintering highest temperature holding stage.
Optionally, in this embodiment, in the highest heat preservation stage of the hot-pressing sintering, a gap between an inner wall of the expanded diameter section 107 of the steel body 103 and an outer wall of the circular truncated cone section 105 of the core mold 102 is not greater than XAssembly。
When the diamond drill bit production mold provided by the embodiment is adopted for production, in the highest heat preservation stage of hot-pressing sintering, the gap between the inner wall of the expanding section 107 of the steel body 103 and the outer wall of the circular truncated cone section 105 of the core mold 102 and the gap XAssemblyApproximately equal, that is, in the high-temperature sintering process for producing the diamond bit by using the diamond bit production mold provided in the present embodiment, the actual size and X of the gap between the steel body 103 and the core mold 102 at the high-temperature stage can be ensuredAssemblyThe sizes of the two parts are approximately equal, so that the leakage phenomenon of sintering pressure can be effectively relieved, and the loss of a large amount of bonding materials in the tire body is reduced.
Optionally, when the diamond drill bit is produced by using the diamond drill bit production mold provided in this embodiment, in the highest heat preservation stage of the hot press sintering, the gap between the inner wall of the expanding section 107 of the steel body 103 and the outer wall of the round platform section 105 of the core mold 102 can be controlled within 0.1mm, and compared with the prior art, the gap is significantly reduced.
In some optional embodiments, a gap is provided between the outer wall of the steel body 103 and the inner wall of the bottom mold 101, optionally a gap X between the outer wall of the steel body 103 and the inner wall of the bottom mold 101Outer ringIs 0.1 mm-0.2 mm.
Because the steel body 103 is thermally expanded after sintering, in order to ensure that the steel body 103 can smoothly enter the annular groove between the bottom die 101 and the core die 102, and the outer diameter of the steel body 103 does not press the inner wall of the bottom die 101 after sintering expansion, the gap between the outer wall of the steel body 103 and the inner wall of the bottom die 101 is set after calculation according to the two different expansion coefficients, and is generally ensured to be 0.1 mm-0.2 mm in the high-temperature sintering stage. The gap at the low temperature stage is estimated from the high temperature gap.
In addition, X isOuter ringThe size of (2) is not limited to the above range of values, and other values can be freely selected according to actual production needs.
In some alternative embodiments, the bottom mold 101 is a circular groove, the cylindrical section 104 is fixedly installed on the upper surface of the bottom of the circular groove, the diamond drill bit production mold provided in this embodiment further includes a bottom ring 100, the bottom ring 100 is fixedly installed on the upper surface of the bottom of the circular groove, and annular grooves for placing the diamond cutting bodies and the matrix powder are formed between the outer wall of the core mold 102, the upper surface of the bottom ring 100 and the inner wall of the circular groove.
In some alternative embodiments, the centerline of the cylindrical section 104 passes through the center of the bottom die 101. In this way, the cross section of the produced diamond drill bit is ensured to be circular.
In certain alternative embodiments, the lower end face of the steel body 103 is serrated. The basic shape of the sawtooth is matched with the shape of the bottom ring 100 to ensure that the sintering heights of all parts of the powder alloy sintered body are basically the same, so that the formed tire body alloy can reach the ideal degree of compactness, and the tire body performance is ensured to meet the design requirement. Meanwhile, small sawteeth are designed on the lower end face of the steel body 103 to increase the contact area between the lower end face of the steel body 103 and the diamond cutting body and the tire body alloy powder, so that the steel body 103 and the tire body alloy can be bonded more tightly after sintering, and in the cooling process after sintering, the sawteeth 108 generate enough structural resistance to resist local stress generated by the tire body and the steel body 103 due to different expansion coefficients, and delamination and cracks are prevented from being generated on the bonding surface of the steel body 103 and the tire body.
In certain alternative embodiments, the upper end surface of the mandrel circular land section 105 is provided with a chamfer and the lower end surface of the steel body 103 is provided with a chamfer.
In this embodiment, a chamfer is provided between the lower end surface of the steel body 103 and the inner wall, and a chamfer is also provided between the lower end surface of the steel body 103 and the outer wall.
By arranging the chamfer, the steel body 103 is conveniently assembled and sleeved on the circular truncated cone section 105 of the core mould 102, and the phenomenon that graphite powder scraped off when the steel body scrapes the core mould falls into an alloy powder sintered body to form impurities and the quality and the performance of a matrix are influenced is prevented.
Referring to fig. 3, when the temperature is reduced to the normal temperature after sintering, the steel body 103 contracts to tighten the core mold 102, and the tire body is squeezed, so that the tire body exceeds the width W of the step part of the inner wall of the steel body 103StepFurther reduced, i.e. WStep<XHigh temperature of patentTherefore, the produced diamond drill bit has stronger internal diameter strength and wear resistance.
It should be noted that, in actual production, after the temperature is reduced and the mold is removed after sintering, the steel body 103 needs to be further processed according to the standard of the diamond drill produced, including local increase of the inner diameter and decrease of the outer diameter, forming a smooth tapered surface in which the target inner diameter is transited to the inner diameter of the drill, and a smooth tapered surface in which the target outer diameter is transited to the outer diameter of the drill, and further including processing a connecting thread.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. A diamond bit production mold is characterized by comprising a bottom mold, a core mold and a steel body; the bottom die is used for placing the diamond cutting body and the matrix alloy powder; the core die comprises a cylindrical section and a circular table section, the cylindrical section is fixedly connected with the bottom die, the circular table section is fixedly connected with the cylindrical section, and the lower bottom of the circular table section is superposed with the upper surface of the cylindrical section; the steel body can be sleeved on the circular table section, the lower end of the steel body is arranged between two ends of the circular table section in an initial state, and the lower end of the steel body is arranged at the connecting position of the circular table section and the cylindrical section when the steel body is cooled to a normal temperature state after sintering;
the taper of the circular platform section is K, and K is 2XConventional high temperature:HDescendWherein X isConventional high temperatureThe gap H between the steel body and the core mold at the highest heat preservation stage of hot-pressing sintering in the prior artDescendThe height of the steel body which descends after hot-pressing sintering, HDescend＝aHTyre body，HTyre bodyThe height of a working layer of the diamond drill bit to be processed is defined as a coefficient, and the range of a is 1.5-2.
2. The mold for producing a diamond drill bit according to claim 1, wherein the steel body comprises an equal diameter section and an expanded diameter section which are integrally formed, the equal diameter section is located above the expanded diameter section, the inner diameter of the equal diameter section is equal to the minimum inner diameter of the expanded diameter section, the maximum inner diameter of the expanded diameter section is smaller than the maximum outer diameter of the circular platform section of the core mold in the initial state, and an assembly gap is formed between the inner wall of the expanded diameter section and the outer wall of the circular platform section.
3. The mold for producing a diamond drill bit according to claim 2, wherein a clearance between an inner wall of the expanded diameter section of the steel body and an outer wall of the round table section of the core mold is not greater than the fitting clearance at the stage of the highest heat preservation of the hot press sintering.
4. The mold for producing a diamond bit according to claim 1, wherein a gap is provided between an outer wall of the steel body and an inner wall of the bottom mold.
5. The diamond bit production mold according to any one of claims 1 to 4, wherein the bottom mold is a circular groove, and the cylindrical section is fixedly installed on an upper surface of a bottom of the circular groove;
the diamond cutting machine further comprises a bottom ring, wherein the bottom ring is fixedly installed on the upper surface of the bottom of the circular groove, and an annular groove for placing diamond cutting bodies and matrix powder is formed among the outer wall of the core mold, the upper surface of the bottom ring and the inner wall of the circular groove.
6. The mold for producing a diamond bit according to claim 5, wherein the center line of the cylindrical section passes through the center of the bottom mold.
7. The diamond bit production mold according to any one of claims 1 to 4, wherein the lower end surface of the steel body is serrated.
8. The diamond bit production mold according to any one of claims 1 to 4, wherein an upper end surface of the circular truncated cone section is provided with a chamfer, and a lower end surface of the steel body is provided with a chamfer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020345489.7U CN212217082U (en) | 2020-03-18 | 2020-03-18 | Diamond bit production mould |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020345489.7U CN212217082U (en) | 2020-03-18 | 2020-03-18 | Diamond bit production mould |
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| CN212217082U true CN212217082U (en) | 2020-12-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111203534A (en) * | 2020-03-18 | 2020-05-29 | 河北省地矿局第七地质大队 | Diamond bit production mould and diamond bit |
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2020
- 2020-03-18 CN CN202020345489.7U patent/CN212217082U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111203534A (en) * | 2020-03-18 | 2020-05-29 | 河北省地矿局第七地质大队 | Diamond bit production mould and diamond bit |
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Granted publication date: 20201225 |