A fused diamond engraving tool and a method of making the same

Abstract

The present application provides a kind of smelted diamond carving knife and its preparation method, the longitudinal and transverse interlaced groove is opened in the end surface of the knife bar of the smelted diamond carving knife, the spiral groove is opened in the side surface of the end surface of the knife bar, a layer of diamond is filled in groove and spiral groove first, then a layer of diamond is welded, the tip of the carving knife is made, a layer of diamond is welded in the middle part of the knife bar and has spiral chip removal groove, the body of the carving knife is made, the smelted diamond carving knife of the present application, by controlling the size of groove and spiral groove, filling a layer of diamond in groove and spiral groove first, then welding a layer of diamond, improve the utilization rate of diamond and the cutting efficiency of carving knife, and prolong the service life of carving knife;The preparation method of the smelted diamond carving knife, using self-made feeding tool combined with spraying feeding process, realize step-by-step layered distribution of diamond, the feeding thickness is uniform and fast, by two layers of diamond distribution at the tip, improve its wear resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diamond tool, in particular to a smelting diamond carving knife and a preparation method thereof. BACKGROUND

[0002] The diamond carving knife is mainly used for carving and modeling of green stone, marble, sandstone and foam ceramic, has the characteristics of high sharpness, non-deformation of the knife head and high carving precision, and is often preferred as a high-efficiency relief tool. With the pursuit of modern architecture and decorative aesthetics, the application of the diamond carving knife is also increasing.

[0003] Due to the special nature of the operation of the diamond carving knife, the cutting edge is operated for a long time and is subjected to a large impact force, resulting in early wear of the cutting edge and the integrity of the diamond of the blade body, and the two are not synchronized, so the tool has to be scrapped in advance. To enhance the wear resistance of the cutting edge of the carving knife, the commonly used methods include: first, improving the concentration and grade of the diamond of the cutting edge, such as the diamond segment and the preparation method thereof and the diamond carving knife disclosed in CN112247860A, the diamond abrasive mass concentration of the cutting edge (21) is 20-50%, and the diamond abrasive mass concentration of the side edge (22) is 2-15%; second, enhancing the holding force of the matrix on the diamond to prevent the diamond from falling off in advance due to impact, such as the single crystal diamond tool machining method and the single crystal diamond tool disclosed in CN105772763A.

[0004] Commonly marketed diamond carving knives use a double-layer diamond laying method, but due to the high concentration and difficulty in control, the carving speed is slow in the later period. The existing preparation method of the diamond carving knife generally uses an alternating method of spraying glue and scattering powder, which has an adverse effect on the holding force and service life of the diamond. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, and the present application provides a smelting diamond carving knife with long service life of the cutting edge, fast carving speed and easy preparation, and a preparation method of the smelting diamond carving knife.

[0006] One of the technical solutions adopted by the present application to solve the technical problem is:

[0007] A smelting diamond carving knife, comprising a knife rod, a longitudinal and transverse intersecting groove is formed on the end face of the knife rod, a spiral groove is formed on the side surface of the knife rod near the end face, a layer of diamond is filled in the groove and the spiral groove first, and then a layer of diamond is welded to form the cutting edge of the carving knife; a layer of diamond is spirally welded in the middle part of the knife rod and has a spiral chip removal groove to form the blade body of the carving knife.

[0008] The smelted diamond carving knife of the present application, by starting groove and spiral groove on the end face and bottom of the knife rod respectively, the groove structure of the end face of the knife rod and the spiral groove on the bottom thereof can not only improve the holding force of the diamond on the knife rod base body, but also help the tip part of the carving knife to smoothly discharge the debris in the cutting process.

[0009] Preferably, the diamond on the tip is made by filling two different sizes of diamonds into the groove and spiral groove at the same time, the two different sizes of diamonds refer to the composition of two kinds of diamonds with different particle sizes, preferably, the two different sizes of diamonds are any two combinations of 18 / 20 mesh, 25 / 30 mesh or 30 / 35 mesh, and the weight ratio of the composition is preferably 1:1. Filling two different sizes of diamonds in the groove and spiral groove can not only regulate the concentration of diamonds, but also solve the technical problem of the difficulty of the tip of the conventional carving knife in cutting, and the two different sizes of diamonds are staggered and arranged in space, which can also enhance the wear resistance of the tip of the carving knife (i.e. the part corresponding to the end face and the bottom of the knife rod), and prevent the tool from early wear failure due to excessive impact.

[0010] The width of the groove is 1-1.5 times the size of the diamond, and the depth is 0.5-0.7mm; the pitch of the spiral groove is 1.4-1.8mm. The width of the groove and the pitch of the spiral groove ensure that only a single diamond can be accommodated in the groove and the spiral groove, so that the diamonds are uniformly and orderly arranged at the end of the knife rod, the diamonds can be effectively utilized, the cutting effect can be played, and the cutting efficiency can be improved, and the service life of the carving knife can be prolonged.

[0011] The width of the groove is 0.6-0.8mm.

[0012] Another technical solution adopted by the present application to solve its technical problems is:

[0013] A preparation method of a smelted diamond carving knife, comprising the following steps:

[0014] 1) knife rod preparation: the knife rod is prepared by using alloy tool steel, the end face of the knife rod is processed with longitudinal and transverse intersecting grooves, the width of the groove is 1-1.5 times the size of the diamond, and the depth is 0.5-0.7mm; the spiral groove is provided on the side surface of the end face of the knife rod, the pitch of the spiral groove is 1.4-1.8mm, the groove and the spiral groove are treated by sandblasting with silicon carbide and cleaned with alcohol, and are ready for use;

[0015] 2) Powder preparation and slurry preparation: the powder includes copper-based / nickel-based brazing filler metal, high molecular binder and diluent, the copper-based brazing filler metal is copper-tin-titanium atomized alloy powder or silver-copper-titanium atomized alloy powder, copper-tin alloy powder and brazing aid, the nickel-based brazing filler metal includes nickel-based self-fluxing alloy powder, nickel-phosphorus alloy powder and brazing aid, the copper-based / nickel-based brazing filler metal powder is fully stirred with the high molecular binder to prepare a solder paste, then a proper amount of diluent is added to obtain a solder paste slurry with a viscosity of 15-25 seconds (3# Zhen cup viscosity calibration), and the solder paste slurry is sealed with a jar;

[0016] 3) Tool tip feeding: a thin layer of binder is sprayed or brushed on the tool bar groove and spiral groove, and then two kinds of diamond with different particle sizes are filled into the groove and spiral groove, the diamond particle size being any combination of 18 / 20 or 25 / 30 or 30 / 35;

[0017] 4) Re-feeding: a high molecular spiral belt is fastened to one end of the tool bar, and the spiral direction of the high molecular spiral belt is consistent with the rotation direction of the tool bar, which is beneficial to the removal of powder scraps, the other end of the tool bar is fixed on a bearing seat, and the tool bar rotates through belt transmission, and the solder paste slurry prepared in step 2) is sprayed on the tool tip and tool body in one step or multiple steps through a spray gun, so that the slurry does not flow and the thickness of the solder paste on the tool tip and tool body is 0.2-1 mm; when the solder paste slurry is laid on the tool bar, diamond or a mixture of diamond and powder spherical particles with similar particle size to diamond is scattered; after drying, a second round of spraying is performed to cover the surface of the diamond with a layer of solder paste slurry;

[0018] 5) Detection and re-feeding: the high molecular spiral belt on the tool bar after feeding and drying in step 4) is removed, and irregular residual powder and diamond are removed; whether the diamond around the tool body is uniform and whether the diamond falls off are detected, and re-feeding is performed for a larger area without diamond; finally, the tool bar is placed upside down on a graphite disc, which can effectively prevent the tool bar from falling over;

[0019] 6) Degreasing and sintering: the tool bar is placed in a pure hydrogen atmosphere or argon atmosphere furnace to remove the binder therein, the atmosphere dew point is lower than-40℃, the degreasing temperature is between 350-450℃, the degreasing time is 1-3 hours, the tool bar is handled with care after degreasing to prevent material falling off, and finally the tool bar is placed in a high vacuum furnace for sintering.

[0020] The preparation method of the smelted diamond carving knife can effectively control the diamond concentration of the carving knife by adopting filling and spraying feeding modes for the knife tip and the knife body respectively, and solves the technical problem that the traditional carving knife cannot be sharpened due to the high diamond concentration.

[0021] The preparation method of the mixture of the diamond and the powder spherical particles with similar granularity to the diamond is as follows: the powder prepared in step 2) is granulated by stirring to form powder spherical particles with similar granularity to the diamond, and then the powder spherical particles are mixed with the diamond with a weight required by the process according to the concentration requirement (the volume concentration of the diamond is generally controlled to be 50%-200%) to obtain the mixture. In view of the problem that the surface diamond concentration of the carving knife body is difficult to control, the diamond is mixed with the powder spherical particles according to the process requirement to effectively control the diamond spacing, improve the sharpness of the diamond carving knife, and effectively solve the problem that the existing carving knife has low cutting efficiency due to the high diamond concentration.

[0022] Preferably, the width of the groove is 0.6-0.8 mm.

[0023] In step 2), the copper-tin-titanium atomized alloy powder includes tin content of 8wt%-22wt%, titanium content of 5wt%-15wt%, and the rest is copper; the silver-copper-titanium atomized alloy powder includes copper content of 20wt%-30wt%, titanium content of 3.5wt%-6wt%, and the rest is silver;

[0024] The nickel-based self-fluxing alloy powder includes chromium content of 14wt%-17wt%, boron content of 2.5wt-4.5wt%, silicon content of 3wt%-3.5wt%, and the rest is nickel; the content of the high molecular binder accounts for 5%-20% of the total weight of the powder, and the diluent is one or two of n-heptane, carbon tetrachloride and petroleum ether to adjust the viscosity of the solder paste.

[0025] In step 2), the feeding tooling includes a high molecular spiral belt and a rotating mechanism for rotating the knife rod, the high molecular spiral belt is sleeved on the knife rod, the spiral direction of the high molecular spiral belt is consistent with the rotating direction of the knife rod, which facilitates the feeding of the surface diamond of the knife body, and preferably, the high molecular spiral belt, the rotating direction of the knife rod and the direction of the spiral grooves of the knife rod are consistent; the rotating mechanism includes a roller, a belt, a bearing seat and a frame body, a plurality of bearing seats for mounting the knife rod are arranged on the frame body, the other end of the bearing seat is connected with the roller, the belt is sleeved on the roller, the roller is electrically connected with a driving motor, and the bearing seat is rotated by the driving motor.

[0026] In step 5, the copper-based solder sintering temperature is 700-910 DEG C, the vacuum degree is less than 0.001 Pa, and the holding time is 5-15 minutes; the nickel-based solder sintering temperature is 1080-1200 DEG C, the vacuum degree is 0.1-0.5 Pa, and the holding time is 6-25 minutes.

[0027] A smelted diamond carving knife is prepared by the preparation method of the smelted diamond carving knife.

[0028] The smelted diamond carving knife has the following beneficial effects:

[0029] The smelted diamond carving knife has the following beneficial effects:

[0030] The smelted diamond carving knife has the following beneficial effects:

[0031] The smelted diamond carving knife has the following beneficial effects:

[0032] The smelted diamond carving knife has the following beneficial effects:

[0033] The smelted diamond carving knife has the following beneficial effects:

[0034] The smelted diamond carving knife has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0035] Fig. 1 FIG. 1 is a perspective view of a smelted diamond carving knife according to the present application;

[0036] Fig. 2 FIG. 2 is a longitudinal sectional view of a shank of the smelted diamond carving knife according to the present application;

[0037] Fig. 3—This is a schematic diagram of the end face structure of the shank of a smelting diamond engraving tool according to the present invention;

[0038] Fig. 4 —A schematic diagram of the feeding fixture used in the preparation method of a smelting diamond engraving tool in this invention;

[0039] Fig. 5 -for Fig. 4 A schematic diagram of the three-dimensional structure of a medium- to high-molecular-weight helical ribbon.

[0040] In the diagram: 1. Tool holder; 11. Groove; 12. Spiral groove; 2. Tool tip; 3. Tool body; 31. Chip removal groove; 4. Bearing housing; 5. Belt; 6. Roller; 7. Drive motor; 8. Polymer spiral belt. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0042] Example 1

[0043] Reference Figs. 1-3 A smelting diamond carving knife includes a shank, the end face of which is provided with crisscrossing grooves, and the side surface of the shank near the end face is provided with spiral grooves. The grooves and spiral grooves are first filled with a layer of diamond and then welded with another layer of diamond to form the tip of the carving knife. The middle part of the shank is spirally welded with a layer of diamond and has a spiral chip removal groove to form the blade of the carving knife.

[0044] The diamond at the tip of the blade is a 25 / 30 grain diamond.

[0045] The groove has a width of 0.6 mm, which is 1.0 times the size of the diamond grains it contains, and a depth of 0.5 mm. The pitch of the spiral groove is 1.4 mm. The width of the groove and the pitch of the spiral groove ensure that only a single diamond can be accommodated within the groove and spiral groove, thus allowing the diamonds to be evenly and orderly distributed at the end of the tool holder. This enables the diamonds to be effectively utilized for cutting and allows for sufficient chip removal, thereby improving cutting efficiency and extending the service life of the engraving tool.

[0046] This embodiment describes a method for preparing a fused diamond engraving tool, comprising the following steps:

[0047] 1) Tool holder preparation: The tool holder is made of alloy tool steel. The end face of the tool holder is machined with crisscrossing grooves. The width of the grooves is 0.6 mm, which is 1.0 times the size of the diamond particles filled in, and the depth is 0.5 mm. The side surface of the tool holder near the end face is provided with spiral grooves with a pitch of 1.4 mm. The grooves and spiral grooves are treated with silicon carbide sandblasting and cleaned with alcohol for later use.

[0048] 2) Powder preparation and slurry preparation: the powder includes copper-based brazing filler metal, polymer binder and diluent, the copper-based brazing filler metal is copper-tin-titanium atomized alloy powder, copper-tin alloy powder and brazing aid, the copper-based brazing filler metal powder is fully stirred with the polymer binder to prepare the solder paste, then the appropriate amount of diluent is added to obtain the solder paste slurry with the viscosity of 15-25 seconds (3# Zhen cup viscosity calibration), and the solder paste slurry is sealed with a jar;

[0049] 3) Knife tip feeding: a thin layer of adhesive is sprayed or brushed on the groove and spiral groove of the knife rod, and then the diamond with a particle size of 25 / 30 is filled into the groove and spiral groove;

[0050] 4) Re-feeding: a polymer spiral belt is fastened to one end of the knife rod, and the spiral direction of the polymer spiral belt is consistent with the rotation direction of the knife rod, which is beneficial to the removal of powder scraps, the other end of the knife rod is fixed on a bearing seat, and the bearing seat rotates through a belt drive, and the solder paste slurry prepared in step 2) is sprayed on the knife tip and the knife body through a spray gun in one step or multiple steps, so that the solder paste slurry does not flow and the thickness of the solder paste on the knife tip and the knife body is 0.5 mm; when the solder paste slurry is laid on the knife rod, the diamond is scattered; after drying, the second round of spraying is performed to cover the surface of the diamond with a layer of solder paste slurry;

[0051] 5) Detection and re-feeding: the polymer spiral belt on the knife rod after the feeding and drying in step 4) is removed, and irregular residual powder and diamond are removed; whether the diamond around the knife body is uniform and whether the diamond falls off are detected, and re-feeding is performed for a larger area without diamond; finally, the knife rod is placed upside down on a graphite disc, which can effectively prevent the knife rod from falling over;

[0052] 6) Degreasing and sintering: the knife rod is placed in a pure hydrogen atmosphere or an argon atmosphere furnace to remove the binder therein, the atmosphere dew point is lower than-40℃, the degreasing temperature is between 350-450℃, the degreasing time is 1-3 hours, the knife rod is handled with care after degreasing to prevent the material from falling off, and finally the knife rod is sintered in a high vacuum furnace.

[0053] In step 2), the copper-tin-titanium atomized alloy powder includes tin with a content of 20wt%, titanium with a content of 15wt%, and the rest is copper (copper content is 65wt%); the content of the polymer binder accounts for 10% of the total weight of the powder, and the diluent is carbon tetrachloride to adjust the viscosity of the solder paste.

[0054] Referring to Fig. 4 and 5In step 2), the feeding tooling includes a high polymer spiral belt and a rotating mechanism for rotating the cutter bar, the high polymer spiral belt is sleeved on the cutter bar, the spiral direction of the high polymer spiral belt is consistent with the rotating direction of the cutter bar and the spiral direction of the spiral groove of the cutter bar, so as to facilitate feeding of the surface layer diamond of the cutter body; the rotating mechanism includes a roller, a belt, a bearing seat and a frame body, a plurality of bearing seats for mounting the cutter bar are arranged on the frame body, the other end of the bearing seat is connected with the roller, the belt is sleeved on the roller, the roller is electrically connected with a driving motor and rotates to drive the bearing seat to rotate through the driving motor.

[0055] In step 5), the sintering temperature of the copper-based solder is 700-910 DEG C, the vacuum degree is less than 0.001 Pa, and the holding time is 5-15 minutes.

[0056] The prepared smelted diamond carving knife has ordered arrangement of the diamonds at the tip of the knife and the diamonds are staggered in space and form levels, which is beneficial to chip removal and efficient cutting.

[0057] Embodiment 2

[0058] With reference to Figs. 1-3 A smelted diamond carving knife includes a cutter bar, a longitudinal and transverse staggered groove is arranged on the end face of the cutter bar, a spiral groove is arranged on the side surface of the cutter bar close to the end face, the groove and the spiral groove are filled with two kinds of diamonds with different particle sizes, and then a layer of diamonds is welded to form the tip of the carving knife; a layer of diamonds is spirally welded in the middle part of the cutter bar and has a spiral chip removal groove to form the cutter body of the carving knife.

[0059] The diamonds filled in the tip are made of a combination of 18 / 20 particle size and 25 / 30 particle size diamonds with a weight ratio of 1:1.

[0060] The width of the groove is 0.8 mm, which is 1.5 times the particle size of the filled diamonds, and the depth is 0.7 mm; the pitch of the spiral groove is 1.8 mm. The width of the groove and the pitch of the spiral groove ensure that only a single diamond can be accommodated in the groove and the spiral groove, so that the diamonds are uniformly and orderly arranged at the end of the cutter bar, the diamonds can be effectively utilized, the cutting effect is exerted, the chip removal is fully achieved, the cutting efficiency is improved, and the service life of the carving knife is prolonged.

[0061] The preparation method of the smelted diamond carving knife of the embodiment includes the following steps:

[0062] 1) Preparation of the tool bar: the tool bar is made of alloy tool steel, the end face of the tool bar is processed into longitudinal and transverse intersecting grooves, the width of the grooves is 1.5 times the size of the diamond particles, and the depth is 0.7 mm; the side surface of the end face of the tool bar is provided with spiral grooves, the pitch of the spiral grooves is 1.8 mm, the grooves and the spiral grooves are sandblasted with silicon carbide and cleaned with alcohol, and are ready for use;

[0063] 2) Powder preparation and slurry preparation: the powder includes nickel-based brazing material, polymer binder and diluent, the nickel-based brazing material includes nickel-based self-fluxing alloy powder, nickel-phosphorus alloy powder and brazing aid, the nickel-based brazing material powder is fully stirred with the polymer binder to prepare the solder paste, and then an appropriate amount of diluent is added to obtain the solder paste slurry with a viscosity of 15-25 seconds (3# Zhen cup viscosity calibration), and the solder paste slurry is sealed and stored in a jar;

[0064] 3) Tool tip feeding: a thin layer of binder is sprayed or brushed on the grooves and spiral grooves of the tool bar, and then two different sizes of diamonds are filled into the grooves and spiral grooves;

[0065] 4) Re-feeding: a polymer spiral belt is fastened to one end of the tool bar, and the spiral direction of the polymer spiral belt is consistent with the rotation direction of the tool bar, which is beneficial to the removal of powder scraps, the other end of the tool bar is fixed on a bearing seat, and rotates through belt transmission, and the solder paste slurry prepared in step 2) is sprayed on the tool tip and tool body in one step or multiple steps through a spray gun, so that the slurry does not flow and the thickness of the solder paste on the tool tip and tool body is 0.5 mm; when the solder paste slurry is laid on the tool bar, diamonds are scattered; after drying, a second round of spraying is performed to cover the surface of the diamonds with a layer of solder paste slurry;

[0066] 5) Detection and re-feeding: the polymer spiral belt on the tool bar after step 4) is removed, and irregular residual powder and diamonds are removed; whether the diamonds around the tool body are uniform and whether the diamonds fall off are detected, and re-feeding is performed for a larger area without diamonds; finally, the tool bar is placed upside down on a graphite disc, which can effectively prevent the tool bar from falling over;

[0067] 6) Degreasing and sintering: the tool bar is placed in a pure hydrogen atmosphere or argon atmosphere furnace to remove the binder therein, the atmosphere dew point is lower than -40℃, the degreasing temperature is between 350-450℃, the degreasing time is 1-3 hours, and the tool bar is handled with care after degreasing to prevent material from falling off; finally, the tool bar is sintered in a high vacuum furnace.

[0068] The preparation method of the smelted diamond carving knife adopts filling and spraying feeding two distribution modes for the knife tip and the knife body respectively, can effectively control the diamond concentration of the carving knife, solves the technical problem that the conventional carving knife cannot be sharpened due to the diamond concentration being too high, and realizes the feeding of the knife body by combining the spraying feeding with the feeding tool, so that the feeding thickness is uniform and the feeding speed is fast, the high polymer spiral belt in the feeding tool ensures that the knife body part has the same spacing between the chip removal grooves, and promotes the chip removal in the carving knife processing process.

[0069] In step 2), the nickel-based self-fluxing alloy powder includes chromium content of 16wt%, boron content of 4.0wt%, silicon content of 3.5wt%, and the rest is nickel (nickel content of 76.5wt%); the content of the high polymer binder accounts for 15% of the total weight of the powder, and the diluent is a mixture of n-heptane and petroleum ether in a volume ratio of 1:1 to adjust the viscosity of the solder paste.

[0070] With reference to Fig. 4 and 5 In step 2), the feeding tool includes a high polymer spiral belt and a rotating mechanism for rotating the knife rod, the high polymer spiral belt is sleeved on the knife rod, and the spiral direction of the high polymer spiral belt is consistent with the rotating direction of the knife rod, which facilitates the feeding of the diamond on the surface layer of the knife body, preferably, the high polymer spiral belt, the rotating direction of the knife rod, and the direction of the spiral grooves of the knife rod are consistent; the rotating mechanism includes a roller, a belt, a bearing seat, and a frame body, a plurality of bearing seats for mounting the knife rod are arranged on the frame body, the other end of the bearing seat is connected with the roller, the belt is sleeved on the roller, the roller is electrically connected with a driving motor, and the roller is rotated to drive the bearing seat to rotate through the driving motor.

[0071] In step 5), the sintering temperature of the nickel-based solder is 1080-1200℃, the vacuum degree is 0.1-0.5Pa, and the holding time is 6-25 minutes.

[0072] The smelted diamond carving knife prepared by the preparation method of the smelted diamond carving knife of the embodiment has ordered arrangement of the diamond on the knife tip, and the diamond is staggered and forms levels in space, which is beneficial to chip removal and efficiently plays the cutting role. According to actual use test, compared with conventional smelted diamond carving knives, the utilization rate of the diamond and the cutting efficiency of the carving knife are respectively increased by 34.2% and 35.4%, and the service life of the carving knife is prolonged by 1.2 years.

[0073] Embodiment 3

[0074] With reference to Figs. 1-3The smelted diamond carving knife of the embodiment comprises a knife rod, a longitudinal and transverse intersecting groove is formed on the end face of the knife rod, a spiral groove is formed on the side surface of the knife rod near the end face, the groove and the spiral groove are filled with two kinds of diamond with different particle sizes, and a layer of diamond is welded to form the knife tip of the carving knife; the diamond is spirally welded in the middle part of the knife rod to form the knife body of the carving knife.

[0075] The diamond filled at the knife tip is made of a composition of 25 / 30 particle size and 30 / 35 particle size diamond with a weight ratio of 1:1.

[0076] The width of the groove is 0.72 mm, which is 1.2 times the particle size of the filled diamond, and the depth is 0.6 mm; the pitch of the spiral groove is 1.6 mm. The width of the groove and the pitch of the spiral groove ensure that only a single diamond can be accommodated in the groove and the spiral groove, so that the diamond is uniformly and orderly arranged at the end of the knife rod, the diamond can be effectively utilized, the cutting effect can be played, and the cutting efficiency can be improved, and the service life of the carving knife can be prolonged.

[0077] Compared with the embodiment 2, the preparation method of the smelted diamond carving knife of the embodiment has the following differences:

[0078] The preparation method comprises the following steps:

[0079] 1) Preparation of the knife rod: the knife rod is prepared by using alloy tool steel, a longitudinal and transverse intersecting groove is formed on the end face of the knife rod, the width of the groove is 1.2 times the particle size of the diamond, and the depth is 0.72 mm; a spiral groove is formed on the side surface of the knife rod near the end face, the pitch of the spiral groove is 1.6 mm, the groove and the spiral groove are treated by sandblasting with silicon carbide and cleaned with alcohol, and are ready for use;

[0080] 2) Powder preparation and slurry preparation: the powder comprises copper-based / nickel-based brazing filler metal, high molecular binder and diluent, the copper-based / nickel-based brazing filler metal powder and the high molecular binder are fully stirred to prepare the solder paste, the appropriate amount of diluent is added to obtain the solder paste slurry with a viscosity of 15-25 seconds (3# Cain cup viscosity calibration), and the slurry is sealed and stored in a jar;

[0081] 3) Knife tip loading: a thin layer of binder is sprayed or brushed on the groove and the spiral groove of the knife rod, and two kinds of diamond with different particle sizes are filled in the groove and the spiral groove;

[0082] 4) Re-loading: Prepare the loading tool, fasten the polymer spiral belt on one end of the blade, and make the spiral direction of the polymer spiral belt consistent with the rotation direction of the blade, which is beneficial to the discharge of powder scraps. Fix the other end of the blade on the bearing seat, and make it rotate through belt transmission. At the same time, spray the solder paste slurry prepared in step 2) on the blade tip and blade body in one step or multiple steps through the spray gun, so that the slurry does not flow and the thickness of the solder paste on the blade tip and blade body is 0.2-1 mm. When the solder paste slurry is spread on the blade, sprinkle the mixture of diamond and powder spherical particles with a particle size similar to that of diamond; after drying, perform a second round of spraying to make the surface of the mixture of diamond and powder spherical particles with a particle size similar to that of diamond covered with a layer of solder paste slurry;

[0083] 5) Detection and replenishment: Remove the polymer spiral belt on the blade after loading and drying in step 4), and remove irregular residual powder and diamond; detect and replenish for larger areas without diamond; finally, place the blade upside down on a graphite disc;

[0084] 6) Degreasing and sintering: Place the blade in a pure hydrogen or argon atmosphere furnace to remove the binder, with an atmosphere dew point below -40℃, a degreasing temperature of 350-450℃, and a degreasing time of 1-3 hours. After degreasing, sinter in a high vacuum furnace.

[0085] The preparation method of the mixture of diamond and powder spherical particles with a particle size similar to that of diamond is as follows: the powder prepared in step 2) is granulated by stirring to form powder spherical particles with a particle size similar to that of diamond. Then, according to the concentration requirement (the volume concentration of diamond is 50%~200%, and in this embodiment, the volume concentration of diamond is 150%), the powder spherical particles are mixed with diamond of the required weight to obtain the mixture. In view of the problem of difficult control of the surface diamond concentration of the engraving tool, according to the process requirements, the diamond and powder spherical particles are mixed and laid together, which effectively controls the diamond spacing, improves the sharpness of the diamond engraving tool, and effectively solves the problem of low cutting efficiency caused by excessive diamond concentration of the existing engraving tool.

[0086] The preparation method of the sintered diamond engraving tool of this embodiment is equivalent to the sintered diamond engraving tool prepared by the preparation method of embodiment 2, and the sharpness of the engraving tool is improved by 9.2% compared with the sintered diamond engraving tool of the embodiment.

[0087] The end groove and spiral groove of the tool shank of the smelted diamond carving knife can also be filled with 18 / 20 grit, or 25 / 30 grit, or a combination of 18 / 20 grit and 30 / 35 grit diamond with a weight ratio of 1:2, or a combination of 25 / 30 grit and 30 / 35 grit diamond with a weight ratio of 1:1. The changes of the above technical features can be understood and implemented by the person skilled in the art through the description, and therefore will not be described in the drawings.

[0088] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A method of making a sintered diamond carving tool, characterized in that, The preparation method of the smelted diamond carving knife comprises the following steps: 1) knife rod preparation: the knife rod is prepared by using alloy tool steel, the groove and spiral groove are sandblasted by silicon carbide, and then cleaned by alcohol, and standby; 2) powder preparation and slurry preparation: the powder comprises copper-based / nickel-based brazing filler metal, polymer binder and diluent, the copper-based / nickel-based brazing filler metal powder is fully stirred with the polymer binder to prepare the solder paste, and then a proper amount of diluent is added to obtain the solder paste slurry with a viscosity of 15-25 seconds, the viscosity is calibrated by a 3# Zahn cup viscosity standard, and then the solder paste slurry is sealed and stored in a jar; 3) knife tip feeding: a thin layer of binder is sprayed or brushed on the groove and spiral groove of the knife rod, and then two kinds of diamond with different particle sizes are filled into the groove and spiral groove; 4) re-feeding: a polymer spiral belt is fastened to one end of the knife rod, and the spiral direction of the polymer spiral belt is consistent with the rotating direction of the knife rod, which is beneficial to the removal of powder scraps, the other end of the knife rod is fixed on the bearing seat of the feeding tool, the knife rod is rotated by the belt drive of the feeding tool, and the solder paste slurry prepared in step 2) is sprayed on the knife tip and the knife body in one step or multiple steps by a spray gun, so that the slurry does not flow and the thickness of the solder paste on the knife tip and the knife body is 0.2-1 mm; when the solder paste slurry is laid on the knife rod, diamond or a mixture of diamond and powder spherical particles with a particle size similar to that of the diamond is scattered; after drying, the second round of spraying is carried out to cover the surface of the diamond with a layer of solder paste slurry; 5) detection and re-feeding: the polymer spiral belt on the knife rod after the feeding and drying in step 4) is removed, and the irregular residual powder and diamond are removed; detection is carried out, and re-feeding is carried out for the larger area without diamond; 6) degreasing and sintering: the knife rod is placed in a pure hydrogen atmosphere or argon atmosphere furnace to remove the binder therein, the atmosphere dew point is lower than-40℃, the degreasing temperature is between 350-450℃, the degreasing time is 1-3 hours, and after degreasing, the knife rod is placed in a high vacuum furnace for sintering.

2. The method of claim 1, wherein the sintered diamond engraving tool is prepared by the steps of: In step 2), the copper-based brazing filler metal is copper-tin-titanium atomized alloy powder, copper-tin alloy powder and brazing aid, or the copper-based brazing filler metal is silver-copper-titanium atomized alloy powder, copper-tin alloy powder and brazing aid; the copper-tin-titanium atomized alloy powder comprises 8wt%-22wt% of tin, 5wt%-15wt% of titanium, and the rest is copper; the silver-copper-titanium atomized alloy powder comprises 20wt%-30wt% of copper and 3.5wt%-6wt% of titanium, and the rest is silver; the nickel-based brazing filler metal comprises nickel-based self-fluxing alloy powder, nickel-phosphorus alloy powder and brazing aid, the nickel-based self-fluxing alloy powder comprises 14wt%-17wt% of chromium, 2.5wt-4.5wt% of boron, 3wt%-3.5wt% of silicon, and the rest is nickel, the content of the polymer binder accounts for 5%-20% of the total weight of the powder, and the diluent is one or two of n-heptane, carbon tetrachloride and petroleum ether. ​ 3. The method of claim 1, wherein the diamond-tipped engraving tool is prepared by the steps of: In step 4), the feeding tool comprises a polymer spiral belt and a rotating mechanism for rotating the cutter bar, the polymer spiral belt is sleeved on the cutter bar and has a spiral direction consistent with the rotating direction of the cutter bar, so as to facilitate feeding of the surface layer diamond of the cutter body, the rotating mechanism comprises rollers, a belt, bearing seats and a frame body, the frame body is provided with a plurality of bearing seats for mounting the cutter bar, the other end of the bearing seat is connected with a roller, the roller is sleeved with a belt, and the roller is connected with a driving motor and rotates to drive the bearing seat to rotate through the driving motor. ​ 4. The method of claim 3, wherein the diamond-tipped engraving tool is formed by the steps of: The spiral direction of the polymer spiral belt, the rotating direction of the cutter bar and the spiral direction of the spiral groove of the cutter bar are consistent. ​ 5. The method of claim 1, wherein the sintered diamond engraving tool is prepared by the steps of: In step 5), the sintering temperature of the copper-based solder is 700-910 DEG C, the vacuum degree is less than 0.001 Pa, and the holding time is 5-15 minutes; the sintering temperature of the nickel-based solder is 1080-1200 DEG C, the vacuum degree is 0.1-0.5 Pa, and the holding time is 6-25 minutes. ​ 6. A fused diamond carving tool, characterised in that, The smelted diamond carving cutter is prepared by the preparation method of the smelted diamond carving cutter according to claims 1-5, the smelted diamond carving cutter comprises a cutter bar, the end surface of the cutter bar is provided with longitudinal and transverse intersecting grooves, the side surface of the cutter bar near the end surface is provided with spiral grooves, the grooves and the spiral grooves are filled with a layer of diamond and then welded with another layer of diamond to form a cutter tip, and a layer of diamond is spirally welded on the middle part of the cutter bar and provided with a spiral chip removal groove to form a cutter body.

7. The fused diamond engraving tool of claim 6 wherein the diamond is a single crystal diamond. 5 The width of the groove is 1-1.5 times of the particle size of the diamond, and the depth is 0.5-0.7 mm; the pitch of the spiral groove is 1.4-1.8 mm.

8. The fused diamond engraving tool of claim 7 wherein, The width of the groove is 0.6-0.8 mm.

9. A fused diamond engraving tool as claimed in claim 6 or 7 wherein, The diamond on the cutter tip is made by simultaneously filling the grooves and the spiral grooves with a combination of any two of 18 / 20 particle size, 25 / 30 particle size or 30 / 35 particle size diamond.

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