KR100642739B1 - A manufacturing method of machine parts for linear motion and parts manufactured by the above method - Google Patents

Abstract

The present invention is a ball plate or a bearing track mounted to a high load linear bushing in a linear motion system of infinite linear motion used in combination with a circular linear motion shaft for the axial motion of an automated machine or a general mechanical device It relates to a method for producing a plate using a metal injection molding method and a ball plate produced by the production method. More specifically, the present invention kneads the metal powder necessary for molding the ball plate together with the binder, forming a groove and a center portion of the upper surface through which the ball can be rolled and moved at a predetermined temperature and pressure through the injection molding machine. Since the ball plate is manufactured by injecting a ball plate having a somewhat convex structure, and degreasing and sintering, it is possible to form a ball track groove and a concave cone shape at both ends with a more precise and accurate structure. It is possible to precisely form the angle formed between the rocking point and the edge formed on the site, and it is possible to mass-produce, which greatly improves the productivity, and can easily apply the anti-corrosion material to improve the environmental adaptability. There are features that can be.

Ball plate, metal injection molding, swing point

Description

A manufacturing method of machine parts for linear motion and parts manufactured by the above method}

1 is a side view and a front view of a linear ball plate manufactured according to the present invention.

Figure 2: Side and front views of various types of linear ball plates made in accordance with the present invention

Figure 3: Cross section of the linear ball plate according to the present invention

1, 11; Ball plate 2; Edge with a slope of 0.5 °

3; Center part of the somewhat convex ball plate

4; Crowning at both ends of ball raceway

5; Marking part (characters, symbols, etc.)

12; Side view of various forms of ball plates

21; Cross section of ball plate with one track

22; Section of ball plate with two tracks

The present invention is a ball plate or a bearing track mounted on a high load linear bushing in a linear motion system having an infinite linear motion used in combination with a circular linear motion shaft for the axial motion of an automated machine or a general mechanical device Put the metal powder and the binder together in a kneader of pressure heating type kneader, knead for a certain time, grind the mixture into pellets, insert it into the molding machine hopper, and inject into the mold at a predetermined temperature and pressure. In addition, the present invention relates to a ball plate manufacturing method using a metal injection molding method which is subjected to a solvent degreasing step of degreasing and cooling an injection molded product and then finished in a sintering step, and a ball plate manufactured by the method.

In the conventional ball plate manufacturing method, the coil of a raw material is formed by rolling or drawing a ball groove of a ball plate, and then, using a forging press, it is generally used at both the swing point of the central part and the ends of the track groove. By forming a concave-conical structure, it is difficult to maintain the constant dimensional variation of the central thickness of the ball plate for each product at all times. The grinding process of the ball groove of the ball plate with grinding wheel not only reduces productivity, but also the environment due to the limitation of the material. There was a problem of poor adaptability (occurrence of rust).

In addition, the conventional equipment requires a separate equipment and process for forming orbiting the groove of the ball plate by rolling or drawing the coil, and a separate equipment and process for forming the rocking point of the central part is required to purchase equipment. There is a problem such as the economic burden, the installation space of the equipment is required, the loss of time due to the additional process and the loss of labor cost due to the process management, the productivity decreases and the production cost increases significantly. In addition, various types of alloys are required to develop anti-corrosion products, but due to their low usage, the economic burden of using expensive materials is high, and additional laser marking, press marking, and oxidizing agent are required to mark products when necessary. There is a problem that a process such as marking is required more.

The technical problem to be achieved by the present invention is to recognize the problems of the prior art as described above, a linear motion system for infinite linear motion used in combination with a circular shaft for the axial motion of an automated machine or a general mechanical device, etc. Design and manufacture molds of ball plates or bearing track plates with track grooves and swing points mounted on high load linear bushings, and make metal powders of the required type to a predetermined particle size and then use polyethylene, paraffin wax and stearic acid as binders. It is put together in a kneading machine, which is a pressurized heating type kneader, and kneaded for a predetermined time, the mixture is pulverized into pellets, charged into a molding machine hopper, injected into a mold at a predetermined temperature and pressure, and the injection molding is degreased. Solvent degreasing process and cooling for a certain time The purpose of this invention is to achieve a ball plate manufacturing method using a metal injection molding method for designing and manufacturing a ball plate through a sintering step of cooling and a ball plate manufactured by the present manufacturing method.

It is still another object of the present invention to eliminate the need for a separate equipment and process for forming and cutting track grooves of a ball plate by rolling or drawing in the related art. There is no need for separate equipment and process, and because it can produce a large amount at the same time, it can greatly improve productivity, save labor cost and space and cost according to equipment installation, and materials used for mold (metal powder, SUS, etc.) ) Is selected to be capable of preventing oxidation to prevent corrosion to enhance environmental adaptability.

Still another object of the present invention is to design a ball plate by injection molding a concave cone-shaped structure of a raceway groove and a raceway end portion formed in a ball plate by using a mold so that the traveling direction of the ball is directed toward the inside of the raceway groove. Structure to improve the driving performance while minimizing the sliding of the ball, and the shape and angle of the rocking point of the center of the upper surface of the ball plate can be accurately and consistently formed at all times. Production cost and labor cost according to marking by performing this during molding without the need of additional laser marking, press marking or marking process by oxidizing agent for marking letters, logos or numbers on the product if necessary. And time, etc.

The present invention provides a metal injection molding of a ball plate or a bearing track plate mounted on a high load linear bushing in a linear motion system having infinite linear motion used in combination with a circular LM shaft for axial motion of an automated machine or a general mechanical device. It relates to a method of manufacturing using the method and a ball plate produced by the method. The conventional ball plate manufacturing method is to form the orbit groove of the ball plate by rolling or drawing the coil, which is a raw material, and then using the forging press, the swing point of the central portion and both ends of the orbit groove It is difficult to always maintain the constant dimensional deviation of the thickness of the ball plate by the concave-concave structure in the product, and the grinding process of the ball groove of the ball plate with grinding wheel not only reduces productivity but also due to the limitation of material There is a problem of poor environmental adaptability (rust generation), and also requires a separate equipment and process for forming the orbital groove of the ball plate by rolling or drawing the coil of the raw material, and to form a rocking point of the central portion It requires separate equipment and process to save economic burden Poor productivity and production cost is loss of labor occurred in time loss and process control according to the process has a problem in performing such an increase.

The present invention manufactures a ball plate by the manufacturing method by injection molding that can solve the above problems at the same time. After describing the schematic construction means of the ball plate by injection molding according to the present invention, since the processing temperature and time vary slightly depending on the material, specific construction means will be described based on the embodiments. Schematic manufacturing method of the ball plate according to the present invention is a) mounted on a high load linear bushing in a linear motion system for infinite linear motion used in combination with a circular shaft for the axial motion of automated machines or general machinery, etc. A process of making a mold in the form of a ball plate or a bearing track plate, b) a process of mixing a predetermined amount of metal powder to a certain particle size and uniformly mixing for a predetermined time in consideration of the durability of the ball plate, and c) Mixing the mixed metal powder with a binder, polyethylene, paraffin wax and stearic acid into a kneader, a kneading machine of a pressurized heating method, for kneading for a predetermined time; and d) pelleting the kneaded mixture by putting the metal powder and the binder into the kneader. Pulverizing to form into the injection molding machine hopper, and e) forming injection molding machine hopper A process of injecting the charged mixture into the mold of the ball plate at a predetermined temperature and pressure, f) a solvent degreasing process of degreasing and cooling the injection molded body after injection is completed, and g) a sintering process of sintering and quenching at a high temperature for a predetermined time. Is done. In the process a), the tracks and track grooves for guiding the movement of the ball and the structure inducing the two edges to be flowed up to an interval of 0.5 ° with respect to the center of the ball plate for the automatic axial self-alignment and smooth circulation of the ball in the process The mold (form) of the ball plate provided with the crowning structure of the end part is designed and manufactured. At this time, the mold is designed and manufactured to be 115 ~ 125% larger than the actual product considering the shrinkage rate in the degreasing process of removing the binder and the sintering process inducing the diffusion of metal molecules. The shrinkage rate can be stabilized to a certain value with the stabilization of the ball plate production process. The step b) corresponds to the case where a mixture of different metal powders is used, and in the case of a single type of metal powder, only the particle size of the metal powder needs to be kneaded with the binder. The composition of the metal powder injection molding binder used in the step c) maintains the shape of the ball plate and improves the flexibility of the secondary binder and the polymer which promotes lubrication of the mold and viscosity of the main binder and the mixture which are the main agents of the flow. It is composed of a surfactant for improving, etc. In the present invention, polyethylene, paraffin wax and stearic acid are mixed in a predetermined ratio (predetermined) to form a binder. The degreasing process of d) is a process of removing the binder from the injection molded body formed by the ball plate, which is an important process because the binder, which constitutes a substantial portion of the injection molded body, must be completely removed without generating a defect such as distortion or cracking. It takes time. The binder removal method includes a method of removing only heat using a circulating gas and a solvent extraction method of selectively extracting only a low melting point material from a binder using a solvent and removing the remaining main binder as heat. As the solvent used in the solvent extraction process, nucleic acid, heptane, acetone, benzene, decalin and alcohol are used. In the final sintering process, the sintering process is heated to 1200 ° C to 1400 ° C for a certain time in a vacuum atmosphere or a specific atmosphere to produce metal sintered body through diffusion of metal powder. With regard to the mold, the extrusion mold should be designed and manufactured to be 115 ~ 125% larger than the actual product in consideration of the shrinkage occurring during the degreasing and sintering process, and maintain a certain surface hardness (controlled to HRC61 to 63). In order to heat-treat the molded product after sintering of metal, the powder raw materials such as Fe-2% Ni and SCM415 are commonly used for carburizing, quenching, tempering, etc. The SUS440C must be subjected to a heat treatment process such as quenching and tempering.

The construction means according to the present invention will be described in detail based on the embodiments.

Example 1

Embodiment 1 according to the present invention is a) in the case of a ball plate or a bearing track plate form the edge of the plate is inclined about 0.5 ° than both ends, and for smooth circulation of the track groove and the ball to guide the ball movement Both ends are formed with a crowning structure, and the upper surface can be engraved with letters, logos or numbers that can display the product name, manufacturer and size, if necessary, and the size and shape of the extrusion mold In this case, the process of designing and manufacturing a mold larger than the actual product by 115-125% in consideration of the shrinkage rate during sintering, and b) forming the particle size of the metal powder of carbonyl iron in order to manufacture the plate by the designed mold. The particle size of nickel powder is about 5 to 10 μm, and the mixing ratio of carbonyl iron and nickel is 98: 2 in weight percent (wt%). C) mixing the powder evenly for about 2 hours, and c) mixing the mixed metal powder with a binder composed of the composition ratio as shown in Table 1 in the kneader of the pressure heating type kneader at 200 ° C. for about 2 hours. K) while rotating at a speed of 35 to 40 revolutions per minute, and d) pulverizing the mixture of the metal powder and the binder in a pellet form to charge into a molding machine hopper, and then the temperature of the mold is 40 And the nozzle temperature of the injection machine is set at 150 ° C. to inject into the mold of the plate at an appropriate pressure according to the molding condition of the product, and e) the injection molded body is mounted on a support to the nucleic acid solvent in the degreasing bath. After charging, the solvent temperature is raised to 40 ° C. and maintained for 8 hours, followed by cooling the solvent degreasing step, and f) the molded product obtained through the solvent degreasing step is 1230 ° C. to 1280. In the introduction of the argon gas while maintaining a high vacuum, after about 2 hours by maintaining the coarse step of sintering of a metal sintered body through the diffusion reaction between the metal by using a cooling fan through a cooling step of cooling it takes place the production of the plate.

Table 1. Composition and Composition Ratio of the Binder

Table 2 shows the characteristics of the Fe-2% Ni ball plate sintered body obtained after the sintering process was designed and manufactured based on Example 1 according to the present invention.

Table 2. Characteristics of Fe-2% Ni Sintered Body after Sintering Process

Example 2

Embodiment 2 according to the present invention is a) in the case of a ball plate or a plate of a bearing track plate, the middle point is convex 0.5 ° from both ends, and both ends for smooth circulation of the track groove and the ball to guide the ball movement The end is formed with a crowning structure, and the upper surface can be engraved with letters, logos or numbers that can display the product name, manufacturer and size, if necessary, in size and shape. Considering the shrinkage rate during sintering, the process of designing and manufacturing a mold larger than the actual product by 115 ~ 125%; and b) the particle size of the metal powder of SCM 415 manufactured by a waterless method for forming a plate with the designed and manufactured mold. In the kneading machine is a kneading machine of the pressurized heating method with a metal powder prepared in about 15㎛ with a binder consisting of the composition ratio as shown in Table 1 of Example 1 Kneading while rotating the blade speed of the kneader blade at 35 to 40 times per minute at 200 ° C., and c) mixing the metal powder and the binder evenly in a pellet form. Pulverization and charging into the injection molding machine hopper and the mold temperature is maintained at 40 ℃ and the nozzle temperature of the injection machine is set to 150 ℃ to inject into the mold of the plate at an appropriate pressure according to the molding condition of the product, d) injection The finished molded body was mounted on a support, charged in a nucleic acid solvent in a degreasing bath, and then heated to a solvent temperature of 40 ° C., maintained for about 8 hours, and cooled, and e) a mold released through the solvent degreasing step was 1230 ° C. After the argon gas is injected at a high vacuum of 1280 to 1280 ° C. for about 2 hours, the cooling fan is sintered to the sintered metal through a diffusion effect between the metals. The ball plate is manufactured through a cooling step of cooling by using. Table 3 shows the characteristics of the ball plate sintered body made of SCM415 obtained after the sintering process was designed and manufactured based on Example 2 according to the present invention.

Table 3. Characteristics of SCM415 Sintered Body after Sintering Process

Example 3

Example 3 according to the present invention is a) in the case of a ball plate or a bearing track plate type plate, the middle point is convex 0.5 ° from both ends, and both ends for smooth circulation of the track groove and the ball to guide the ball movement The end is formed with a crowning structure, and the upper surface can be engraved with letters, logos or numbers that can display the product name, manufacturer and size, if necessary, and the size and shape are extruded molds. In the process of sintering, considering the shrinkage rate of 115 ~ 125%, the process of designing and manufacturing a mold larger than the actual product; b) Particles of the metal powder of SUS 440C manufactured by a waterless method for forming a plate with the designed and manufactured mold Metal powder prepared with a size of about 15㎛ in the kneader of the kneading machine of the pressure heating method together with the binder composed of the composition ratio as shown in Table 1 of Example 1 Kneading while rotating the blade rotation speed of the kneader at 35 to 40 times per minute for about 2 hours at a temperature of 200 ° C., and c) pulverizing the mixed mixture of the metal powder and the binder in a pellet form to a molding machine hopper. After charging, the mold temperature is maintained at 40 ° C. and the nozzle temperature of the injection machine is set at 150 ° C. to inject the mold into the mold of the plate at an appropriate pressure according to the molding condition of the product. After the solvent is loaded into the nucleic acid solvent in the degreasing bath, the solvent temperature is raised to 40 ° C. and maintained for 8 hours, and then, the molded product obtained through the solvent degreasing step is 1230 ° C. to 1280 ° C. In order to prevent the chromium from volatilizing in high vacuum, it is maintained for about 2 hours while argon gas is injected into the metal sintered body through the diffusion effect between the metal molecules. After the sintering process, the ball plate is manufactured through a cooling step of quenching using a cooling fan. Table 4 shows the characteristics of the ball plate sintered body made of SUS440C obtained after the sintering process was designed and manufactured based on Example 3 according to the present invention.

Table 4. Characteristics of SUS440C Sintered Body after Sintering Process

The characteristics of the sintered body after the sintering process after extruding the ball plate through the same process as described above and not limited to the metal powder used in Examples 1 to 3 can exhibit the results as shown in Tables 2 to 4. Metal is enough.

As a result of actual running of the 12 mm ball plate designed and manufactured according to the above Examples 1 to 3, a good driving result was surpassed about twice that of the conventional standard driving.

The present invention does not require a separate equipment and process for forming the ball groove by extrusion molding the ball plate by designing and manufacturing a ball plate, and does not require a separate equipment and process for forming the rocking point of the central portion In addition, since it can produce a large amount at a time, there is an effect that greatly improves the productivity and saves space and expenses due to labor costs and equipment installation.

Another effect of the present invention is to form a concave cone-shaped structure of the raceway groove and the end of the raceway groove formed in the ball plate by extrusion molding into a mold to form a ball plate by moving the direction of the ball into the raceway groove Structure to improve the driving performance while minimizing the sliding of the ball or the angle of rocking point at the center of the upper surface of the ball plate. To greatly improve.

In addition, the upper surface of the ball plate according to the present invention can be engraved with a letter, logo or number that can display the product name, manufacturer and size, etc., so the additional process for marking does not require production costs, labor costs And it can reduce the time and the like, by selecting and manufacturing the material (metal powder, SUS, etc.) used in the mold to be capable of preventing oxidation, there is an effect such as preventing corrosion to increase the environmental adaptability.

Claims (16)

In the manufacturing method using a metal injection molding method of a ball plate or a bearing track plate mounted on a linear bushing, a) The middle point of the upper surface of the ball plate or bearing track plate is formed more convexly than both ends, and the track groove and the track groove end portion guiding the movement of the ball are formed in a concave cone shape, taking into account the shrinkage rate generated in the manufacturing process. Designing and manufacturing a mold of a ball plate or a bearing track plate; b) The particle size of the carbonyl iron is set to 8㎛ to 10㎛, the particle size of the nickel powder is made 4㎛ to 6㎛, and carbonyl iron and nickel are mixed evenly with a mixer, and then the mixed metal powder The mixture of polyethylene, paraffin wax and stearic acid in a pressurized heating type kneader, pulverized and mixed into a molding machine hopper and pulverized the mixed mixture into a molding machine hopper and maintaining the temperature of the injection machine at 140 ℃ to 160 ℃ Injection process inside, c) a solvent degreasing step of mounting the molded article on which the injection has been completed to a support base, loading the molded article into a nucleic acid solvent, and then raising the solvent temperature to 40 ° C. and maintaining it for 7 to 9 hours for degreasing and cooling; d) The sintered compact after the solvent degreasing process is maintained at 1230 ° C. to 1280 ° C. in a high vacuum argon atmosphere for 1 hour 30 minutes to 2 hours 30 minutes, and then sintered into a metal sintered compact through diffusion between metal molecules and cooled. Cooling process, e) a method of manufacturing a ball plate or a bearing track plate, which is subjected to a heat treatment process of carburizing, quenching and tempering in order to increase the strength of the molded body after the sinter cooling process. The method according to claim 1, Ball plate having one or two rows of track grooves having a structure in which the intermediate point is convex than both ends so that the intermediate point of the ball plate or the bearing track plate is convex than both ends in step a). Or bearing track plate manufacturing method. delete The method according to claim 1 or 2, The step of kneading the metal powder and the binder of the b) is a step of evenly mixing the carbonyl iron for 2 hours in a V mixer at a composition ratio of 98% by weight (wt%) and nickel by 2% by weight (wt%), The mixing ratio of polyethylene, paraffin wax and stearic acid as a binder is mixed in weight percent of 60: 33: 7, and the blade of the kneader for 1 hour 30 minutes to 2 hours 30 minutes at a temperature of 200 ° C. in a kneader of a pressure heating type kneader. Ball plate or bearing track plate manufacturing method produced by kneading while rotating the rotation speed 35 to 40 times per minute. delete delete delete In the method for manufacturing a ball plate or a bearing track plate mounted on a linear bushing using a metal injection method, a) the intermediate point of the ball plate or bearing track plate is formed to be more convex than both ends, and both ends are formed in a crowning form for ball circulation, provided with orbit grooves for guiding the movement of the ball, and generated in the manufacturing process Designing and manufacturing the ball plate or bearing track plate molds in consideration of the shrinkage rate to b) The metal powder is composed of SCM415 or SUS440C, the particle size of the metal powder is formed 12㎛ to 16㎛, kneading the kneading material composed of the metal powder and polyethylene, paraffin wax and stearic acid in a kneader of a pressure heating method kneading Pulverizing the evenly mixed mixture into a fillet form and charging it into a molding machine hopper and maintaining the temperature of the injection machine at 140 ° C. to 160 ° C. and injecting the mixture into the mold; c) a solvent degreasing step in which the injection molded product is mounted on a support, and the mold is charged in a nucleic acid solvent, and then the solvent temperature is raised to 40 ° C. and maintained for 7 to 9 hours for degreasing and cooling. d) In the case of SCM415 or SUS440C of the molded body subjected to the solvent degreasing process while injecting argon gas in a high vacuum state at 1230 ℃ to 1280 ℃ to maintain for 1 hour 30 minutes to 2 hours 30 minutes metal sintered body through the diffusion action between the metal molecules Sintering and cooling process, e) a method of manufacturing a ball plate or a bearing track plate, which is subjected to a heat treatment process of carburizing, quenching and tempering in order to increase the strength of the molded body after the sinter cooling process. The method according to claim 8, Method for manufacturing a ball plate or a bearing track plate in the a) is formed by forming the intermediate point is convex than both ends 0.5 ° in order to make the middle point of the ball plate or bearing track plate more convex than both ends. delete delete The method according to claim 8 or 9, In the b) process, the mixing ratio of polyethylene, paraffin wax and stearic acid as a binder is mixed in weight percent of 60: 33: 7, for 1 hour 30 minutes to 2 hours 30 minutes at a temperature of 200 ° C. in a kneader of a pressurized heating type kneader. A ball plate or bearing track plate manufacturing method made by kneading while rotating the kneader blade rotation speed 35 to 40 times per minute. delete The method according to claim 1 or 8, A method of manufacturing a ball plate or a bearing track plate manufactured by using a mold in which a letter, a logo, or a number is displayed by engraving the product on the upper surface or the side of the product at the time of manufacturing the mold. In the method for manufacturing a ball plate or a bearing track plate mounted on a linear bushing using a metal injection method, a) the intermediate point of the ball plate or bearing track plate is formed to be more convex than both ends, and both ends are formed in a crowning form for ball circulation, provided with orbit grooves for guiding the movement of the ball, and generated in the manufacturing process Designing and manufacturing the ball plate or bearing track plate molds in consideration of the shrinkage rate to b) The metal powder is formed by mixing at least two or more of the metal powder of iron-based, molybdenum-based, chromium-based, tungsten-based and titanium-based, wherein the particle size of the metal powder is formed to 12㎛ 16㎛, the mixing The metal powder and the binder composed of polyethylene, paraffin wax, and stearic acid were kneaded in a pressurized heating type kneader, pulverized the mixed mixture evenly into a fillet shape, charged into a molding machine hopper, and then the temperature of the injection machine was raised to 140 ° C. to 160 ° C. Holding and injecting into the mold; c) a solvent degreasing step of mounting the molded article on which the injection has been completed to a support base, loading the molded article into a nucleic acid solvent, and then raising the solvent temperature to 40 ° C. and maintaining it for 7 to 9 hours for degreasing and cooling; d) a step of sintering and cooling the molded body subjected to the solvent degreasing at 1230 ° C. to 1280 ° C. while injecting argon gas at a high vacuum state for 1 hour 30 minutes to 2 hours 30 minutes to sinter and cool the metal sintered body through the diffusion effect between the metal molecules. and, e) a method of manufacturing a ball plate or a bearing track plate, which is subjected to a heat treatment process of carburizing, quenching and tempering in order to increase the strength of the molded body after the sinter cooling process. Ball plate or bearing track plate produced by the method for producing a ball plate or a bearing track plate of any one of claims 1, 2, 8, 9 and 15.

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