KR20190079066A - Apparatus and method for machining a cylindrical motor case for an automobile fuel pump motor - Google Patents

Abstract

The present invention relates to an apparatus and a method for processing a cylindrical motor case for a vehicle fuel pump motor, capable of reducing production costs, which comprises: a case supply unit for supplying a workpiece for a motor case; a case processing unit for processing inner surfaces of both ends of the workpiece for the motor case; and a control unit for controlling to form a step by cutting a front inner surface of the workpiece for the motor case.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical motor case for an automobile fuel pump motor,

The present invention relates to an apparatus and a method for machining a cylindrical motor case for an automobile fuel pump motor. More specifically, the inner surface of the cylindrical motor case is machined by a single chucking operation without changing the position of the motor case work, The concentricity of the inner surface at both ends of the motor case is lowered to 0.05 or less and a separate cleaning step is not required and the production cost can be reduced. By forming the reinforcing layer and the impact absorbing layer on the inner surface of the cylindrical motor case, And more particularly, to a cylindrical motor case for an automotive fuel pump motor capable of improving the durability of an automotive fuel pump motor by protecting internal components of the cylindrical motor case from vibration and impact transmitted thereto.

Generally, a vehicle is provided with a fuel pump so as to be submerged in fuel contained in a fuel tank so that the fuel in the fuel tank can be fed to the engine side, and a fuel pump motor is coupled to drive the impeller provided in the fuel pump. .

As a technique related to such an automotive fuel pump motor, a technique of connecting one end of a shaft to one side of a stator to reduce the length of the shaft so that the supporting point of the shaft is close to the center of gravity of the rotor is disclosed in Korean Unexamined Patent Publication 10-2017-0083345 (published on Jul. 18, 2017), entitled " BLDC motor for fuel pump for vehicle ".

As shown in the above-mentioned Laid-open Patent Publication No. 10-2017-0083345, a motor-driven fuel pump motor is provided with a cylindrical motor case whose upper side and lower side are opened, and a stator and a rotor are installed therein . Both ends of the above-described motor case have a structure in which inner surfaces are cut to form a step.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a process of processing inner surfaces of both ends of a conventional cylindrical motor case for an automobile fuel pump motor. FIG.

As shown in FIG. 1, a conventional process for processing a cylindrical motor case for an automobile fuel pump motor is performed by fixing a workpiece 1 for a motor case to a chuck 2, (1) of the motor case (1) by changing the position of the motor case work (1) in the opposite direction, and cutting the inner surface of one side end of the work (1) And cutting the inner surface to form a step (12).

However, in the conventional method of machining a cylindrical motor case for an automobile fuel pump motor as described above, after the work for the motor case is chucked and the inner surface of one end is finished, the position of the motor case workpiece The center of the shaft is varied due to the two chucking operations, and the concentricity of the inner surface at both ends of the cylindrical motor case is increased to 0.07 ~ 0.13 level. The concentricity refers to the magnitude of the error between the axial center of the cylindrical portion and the reference axial center in the cylindrical portion having the axial center on the same straight line as the reference axial center.

Further, in the conventional method of machining a cylindrical motor case for an automobile fuel pump motor, after machining of a work for a motor case is finished, machining of the inner surface of one end is finished, and then the position of the work for a motor case There is a problem in that the production cost of the cylindrical motor case is increased due to the necessity of a separate washing process for removing the foreign substances in the chucking process.

Published Patent Publication No. 10-2017-0083345

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a motor- The concentricity of the surface is lowered to 0.05 or less, and a separate cleaning step is not required, so that the production cost can be reduced, and an apparatus and a method for processing a cylindrical motor case for an automotive fuel pump motor are provided.

It is another object of the present invention to provide a motor-driven electric motor which can improve the durability of an automotive fuel pump motor by protecting internal components of a cylindrical motor case from vibration and shock transmitted from a vehicle by forming a reinforcing layer and an impact absorbing layer on the inner surface of a cylindrical motor case And an apparatus and method for processing a cylindrical motor case for an automotive fuel pump motor.

In order to achieve the above-mentioned object, the apparatus of the present invention comprises: a case supply part for supplying a work for a motor case; a case for performing a machining operation on both ends of the work for a motor case supplied from the case supply part by one- After the machining portion and the work for the motor case are fixed to the machining chuck of the case machining portion, the inner surface of the rear portion of the work for the motor case is cut using a bite to form a step, and then the position of the work for the motor case is not changed, And a control unit for controlling the front inner surface of the workpiece to be cut to form a step,

The case supply unit may include a lower slider installed on one side of the storage tank for primarily lifting a work for a motor case, a lower slider fixed to the outer surface of the lower slider, An upper slider installed on an outer surface of the intermediate support to receive a work for a motor case from the intermediate support to thereby lift the work for the motor case, And a sorting feeder for receiving a work for a motor case from the swash plate and aligning and supplying the work for a motor case in a line,

The case processing unit includes a transfer chuck for transferring a machined work for a motor case from a machining chuck and transferring a new work for a motor case to a machining chuck, a workpiece for a motor case that has been machined to a transfer chuck, A processing chuck for receiving and fixing the workpiece and rotating the workpiece, and a cutting tool for machining the inner and outer end surfaces of the work for the motor case, which is fixed to the workpiece chuck.

The upper slider, the intermediate slider, and the upper slider have a downward inclination toward the outer side, and a slip-resistant coating layer is formed on the lower slider, the intermediate pedestal, and the upper slider. .

The apparatus of the present invention is characterized in that the anti-slip coating layer comprises 50 ± 10% by weight of LLDPE, 30 ± 10% by weight of polypropylene (PP), 20 ± 10% by weight of HPPE (High Density Poly Ethylene) It is preferable that it has a non-slip function by coating a raw material compounded in a weight percentage by weight.

The apparatus of the present invention is characterized in that the above transferring chuck is provided with an arm provided between the processing chuck and the butt portion for reciprocating rotational movement, and an arm provided at an end of the arm for transferring a new work for a motor case to the processing chuck And a demounting tank provided at an end of the arm at an angle of 90 degrees with the mounting jig for receiving the machined workpiece for a motor case from the processing chuck. It is preferable that a buffer layer is formed on a portion in contact with the work for a motor case.

The composition of the apparatus of the present invention is such that the above buffer layer is composed of 70 to 80 wt% of paraffin oil, 14 to 20 wt% of styrene-ethylene-propylene tri-block copolymer resin as a thermoplastic resin and 5 to 10 wt% By weight to 1 to 2% by weight.

As a means for achieving the above object, the method of the present invention comprises the steps of fixing a work for a motor case to a work chuck and then cutting a rear inner surface of the work for a motor case using a second bite to form a step, And removing the front inner surface of the work for the motor case using the second bite without changing the position of the work for the case, thereby forming a step.

The method of the present invention comprises the steps of forming a molded body in contact with an intermediate inner surface of a work for a motor case and a reinforcing layer separated by a fibrous material formed on the molded body on the intermediate inner surface of the motor case workpiece, An impact absorbing layer prepared by adding 70 to 80% by weight of an oil, 14 to 20% by weight of a styrene-ethylene-propylene tri-block copolymer resin as a thermoplastic resin and 1 to 2% by weight of an antioxidant is formed on the reinforcing layer Step is further preferable.

The constitution of the method of the present invention is such that after the reinforcing layer and the impact absorbing layer are formed, the reinforcing layer and the impact absorbing layer are copolymerized by using a fluorine-containing diol for reinforcement of poor hydrolysis resistance and water resistance, It is preferable that the method further comprises the step of forming a coating layer.

The method of the present invention is characterized in that the above-mentioned fiber material is composed of carbon fibers forming one layer as a main material of the reinforcing layer and reinforcing fibers having a diameter of 15 to 30 denier, which is higher in point than the lattice thermoplastic synthetic fibers, 30 to 40 parts by weight of a plastic composite material in which a tensile fiber is used is mixed and processed, and then the processed sheet is punctured with needles. The connecting fibers formed of the thermosetting synthetic fibers are connected between the carbon fibers and the reinforcing fibers .

In the method of the present invention, after the aluminum material is dissolved in the impact absorbing layer to increase the strength in addition to the elastic restoring force, the dissolved aluminum is transferred to the agitation furnace for agitation with the impact absorbing layer composition, and TiH2 And the like.

In the present invention, both ends of the cylindrical motor case are machined by one chucking without changing the position of the motor case workpiece, so that the concentricity of the inner surface at both ends of the cylindrical motor case is reduced to 0.05 or less, And the inner surface of the cylindrical motor case is protected by protecting the internal components of the cylindrical motor case from vibration and impact transmitted from the vehicle by forming a reinforcing layer and an impact absorbing layer on the inner surface of the cylindrical motor case, It is possible to improve the durability of the battery.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a process of processing inner surfaces of both ends of a conventional cylindrical motor case for an automobile fuel pump motor. FIG.
2 is a block diagram of a machining apparatus for a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention.
3 is a configuration diagram of a case supply portion of a machining apparatus for a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention.
4 is a configuration diagram of a case machining portion of a machining apparatus for a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention.
5 is a photograph showing a state of a case processing part of a processing device of a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention.
6 is a view showing a machining state of a case machining portion of a machining apparatus for a cylindrical motor case for an automobile fuel pump motor according to an embodiment of the present invention.
7 is a photograph showing a machining state of a case machining portion of a machining apparatus for a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention.
8 is a view showing a process of processing a cylindrical motor case for an automobile fuel pump motor by a working device of a cylindrical motor case for an automobile fuel pump motor according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention. Other objects, features, and operational advantages, including the purpose, operation, and effect of the present invention will become more apparent from the description of the preferred embodiments.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not to be construed as limiting the scope of the invention as disclosed in the accompanying claims. And various changes, additions and alterations are possible, including equivalents and substitutions, without departing from the spirit of the invention.

The terms and expressions used in the specification and claims of the present application are defined based on the principle that the inventor can properly define the concept of a term in order to explain its own invention in the best way , Should not be construed as limited to ordinary or dictionary meanings and should be construed in a meaning and a concept consistent with the technical idea of the present invention. By way of example, and not limitation, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise, Quot; includes not only a direct connection or connection but also a connection or connection mediated by other elements in between.

2 is a block diagram of a machining apparatus for a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention.

2, the configuration of a machining apparatus for a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention includes a case supply section 30 for supplying a work 10 for a motor case, A case machining portion 40 for machining the inner surface of the motor case workpiece 10 supplied from the case supply portion 30 by one chucking operation and a machining portion 40 for machining the motor case workpiece 10 to the machining portion 30 And the inner surface of the rear surface of the motor case 10 is cut by using the bite to form a step so that the inner surface of the front portion of the motor case workpiece 10 And a control unit (20) for controlling the formation of a step by scraping the surface.

3 is a configuration diagram of a case supply portion of a machining apparatus for a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention.

3, the structure of the case supply part 30 of the cylindrical motor case for an automobile fuel pump motor according to the embodiment of the present invention is provided on one side of the storage tank and includes a workpiece 10 for a motor case A lower slider 31 fixed to the outer surface of the lower slider 31 and having a height equal to the height of the lower slider 31, And an upper slider 32 installed on an outer surface of the intermediate support 32 for receiving the workpiece 10 for a motor case from the intermediate support 32 and lifting the upper slider The work 10 for a motor case is mounted on the outer surface of the upper slider 33 at a height equal to the height of the upper slider 33, Comprises a receiving wobble plate 34 and, arranged a feeder 35 that supplies arranged in series by receiving the transfer motor keyiseuyong workpiece 10 from the above-described wobble plate 34.

The lower slider 31, the intermediate pedestal 32 and the upper slider 33 have a downward inclination toward the outer side. The lower slider 31, the intermediate pedestal 32, and the upper slider 33 And a slip prevention coating layer is formed on the upper surface of the slip prevention layer. The anti-slip coating layer is composed of 50 ± 10% by weight of LLDPE, 30 ± 10% by weight of polypropylene (PP), and 20 ± 10% by weight of HPPE (High Density Poly Ethylene) And a structure having a non-slip function by coating the raw material. The above-mentioned LLDPE (Linear Low-Density Poly Ethylene) is a resin which is provided in the density range of 0.917 to 0.929 by LG Chemical in order to improve workability and adhesion. The HPPE (High Density Poly Ethylene) To increase it, Lotte Chemical uses a resin that provides a density in the range of 0.948 to 0.961.

4 is a configuration diagram of a case machining portion of a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention. FIG. 5 is a perspective view of a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention. 6 is a view showing a machining state of a case machining portion of a machining apparatus for a cylindrical motor case for an automobile fuel pump motor according to an embodiment of the present invention, and Fig. 7 is a view Fig. 7 is a photograph showing a machining state of a case-machined portion of a machining apparatus for a cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention.

As shown in Figs. 4 to 7, the configuration of the case machining portion 40 of the machining apparatus for a cylindrical motor case for an automotive fuel pump motor according to the embodiment of the present invention is similar to that of the machined portion for a motor case 10, A transfer chuck 41 for transferring the machined workpiece 10 from the machining chuck 42 to the machining chuck 42 and transferring the machined workpiece 10 to the transfer chuck 41 A machining chuck 42 for transferring and fixing a new motor case workpiece 10 from the rear transfer chuck 41 and then rotating the machining chuck 42 and a motor case workpiece 10 fixed to the machining chuck 42 And a bite portion 43 for machining both end faces and outer end faces.

The transfer chuck 41 is provided with an arm 411 which is provided between the processing chuck 42 and the bite portion 43 and reciprocates in rotation and a transfer arm 411 provided at the end of the arm 411, A mounting tongue 412 for transmitting the case workpiece 10 to the machining chuck 42 and a mounting tongue 412 provided at an angle of 90 degrees with the mounting tongue 412 at the end of the arm 411, And a desorption tank 413 for receiving the finished motor case workpiece 10 from the processing chuck 42. [

A buffer layer is coated on a portion of the mounting jaw 412 of the transfer chuck 41 and the portion of the deinking tank 413 that contacts the work 10 for a motor case.

The above-mentioned buffer layer is prepared by adding 70 to 80% by weight of paraffin oil, 14 to 20% by weight of a styrene-ethylene-propylene tri-block copolymer resin as a thermoplastic resin, 5 to 10% by weight of a hydrogenated resin with 1 to 2% by weight of an antioxidant . The materials constituting the above-mentioned buffer layer composition were mixed in a kneading and stirring apparatus, the temperature of the kneading and stirring apparatus was gradually raised to 300 ° C., and the mixture was slowly stirred for 5 to 7 hours to thoroughly mix the entire composition in a stirrer. Of the viscoelastic resin.

The bite section 43 includes a first bite 431 for machining the outer end face of the rear side of the motor case workpiece 10 and a second bite 431 for machining the inner faces of both ends of the motor case workpiece 10, And a third bite 433 for machining the outer end face of the front side of the work case 10 for a motor case.

6 is a view showing a process of processing a cylindrical motor case for an automobile fuel pump motor by a working device of a cylindrical motor case for an automobile fuel pump motor according to an embodiment of the present invention.

As shown in FIG. 6, the process of machining a cylindrical motor case for an automotive fuel pump motor by a machining apparatus for a cylindrical motor case for an automobile fuel pump motor according to an embodiment of the present invention includes machining a workpiece for a motor case 10 A step of forming a step 13 by cutting the rear inner surface of the motor case workpiece 10 by using the second bite 432 after fixing the workpiece 10 for a motor case to the chuck 42, Forming a step 14 by cutting the inner surface of the front side of the work 10 for a motor case by using the second bite 432 and forming a stiffening layer 15 on the intermediate inner surface of the work 10 for a motor case And forming a shock absorbing layer (16) on the reinforcing layer (15).

The reinforcing layer 15 is divided into a molded body abutting the intermediate inner surface of the motor case workpiece 10 and a fibrous material formed on the molded body.

The formed body may be formed of a nonmetallic material such as a plastic material or aluminum or stainless steel material, and may be a mesh or a lattice.

The above-mentioned fibrous material is composed of carbon fibers forming one layer as the main material of the reinforcing layer 15, and long fibers having a thickness of 15 to 30 denier in which the reinforcing fibers melt vertically through the connecting fibers than the lattice thermoplastic synthetic fibers are used 30 to 40 parts by weight of the plastic composite material is mixed and processed, and the processed sheet is punctured with needles. Between the carbon fiber and the reinforcing fiber, a connecting fiber formed of a thermosetting synthetic fiber is connected and formed.

Each of the fibrous layers constituting the fibrous material is capable of producing a honeycomb lattice structure according to a mesh process by a needle split method and the upward direction of the needle split roller formed along the outer circumferential surface of the lattice- And by drag-type punching of a grid-like needle by rotation of a needle split roller in a state in which carbon fibers, connecting fibers, and reinforcing fibers constituting the ashes pass.

The drawing is carried out after needle penetration to the carbon fiber, the connecting fiber and the reinforcing fiber constituting the fiber material, and the drawing is carried out by a mesh process by a needle split method, It is preferable to perform stabilization by heating performed by setting it to 2.4 times. The area ratio of the carbon fiber, the connecting fiber, and the reinforcing fiber sheet subjected to the heating method stretching before and after stretching is increased by 3 to 4.2 times, and the shrinkage ratio due to heat denaturation is reduced to 1% or less .

The above-mentioned carbon fiber is required to be provided with high strength and high degree of sintering by firing acrylic nitrile-based synthetic fiber, and it can be said that the fiber is made only of carbon. This can be obtained from acrylic resin, Pitch and other fibrous carbon materials having a fine graphite crystal structure that are produced through a special heat treatment process.

That is, the acrylic-based nitrile-based synthetic fibers are subjected to a multi-step stretching treatment in an oxidizing gas atmosphere at 300 to 350 占 폚 in a range of 100 to 150% so as to obtain a fiber density of 1.56 to 1.65 g / cm3.

Thereafter, carbon fibers having a strength of 350 kg / mm 2 or more, a modulus of elasticity of 25 to 27 ton / mm 2 and an elongation of 1.57% or more can be stably supplied at a high efficiency and at a high efficiency by treating the chlorinated yarn at a temperature of 300 to 1,000 ° C. in an inert gas atmosphere at a temperature of 100 to 120% shall.

Specifically, the reinforcing fiber is prepared by placing 60 to 70 parts by weight of a thermoplastic synthetic fiber having a thickness of 35 to 56 denier and a reinforcing fiber in a state of a sheet in the form of a sheet and placing the thermoplastic synthetic fiber constituting the reinforced fiber in the form of a connecting fiber The carbon fiber, the connecting fiber, and the reinforcing fiber are integrally melted by partial melting.

The above-mentioned thermoplastic synthetic fibers are used in the form of nonwoven fabric having excellent properties such as stability and thermal stability. To this end, 5 to 10 parts by weight of a thermoplastic multifilament corresponding to one of polypropylene, polyester and polyamide, 70 to 75 parts by weight of polyethylene terephthalate (PET) and 20 to 25 parts by weight of polyethylene naphthalate (PEN) A thermoplastic synthetic fiber nonwoven fabric having excellent weather resistance is used by using multifilaments produced by melt spinning a copolymer.

The fibers constituting the nonwoven fabric are multifilaments or staple fibers made of a copolymer or blend of polyethylene terephthalate and polyethylene naphthalate and the weather resistance (tensile strength retention) is 80% Or more.

The impact absorbing layer 16 should act so as to absorb an external impact due to a reaction with an increase in the tensile strength retention ratio by the reinforcing layer 15.

The above-mentioned impact absorbing layer composition is prepared by adding an antioxidant in an amount of 70 to 80% by weight of paraffin oil, 14 to 20% by weight of a styrene-ethylene-propylene tri-block copolymer resin as a thermoplastic resin and 5 to 10% 1 to 2% of the weight of the composition).

The materials constituting the above-described impact absorbing layer composition were mixed in a kneading and stirring apparatus, the temperature of the kneading and stirring apparatus was gradually raised to 300 DEG C, and the mixture was slowly stirred for 5 to 7 hours to thoroughly mix the entire composition in a stirrer. Of the viscoelastic resin.

The impact absorbing layer composition thus produced has high elongation and strength, and is soft, flexible, and has elastic restoring force against externally applied force.

On the other hand, in order to increase the strength in addition to the elastic restoring force, an aluminum material may be dissolved in the impact absorbing layer 16, and then the molten aluminum may be transferred to the shock absorbing layer composition for stirring with stirring to add TiH2 as a foaming agent have.

Here, the aluminum foamed by the foaming agent adheres to the reinforcing fibers of the reinforcing layer 15, so that it acts to reinforce the tensile strength.

A post-coating layer on which the reinforcing layer 15 and the impact absorbing layer 16 are formed can be formed.

The coating layer can be improved in physical properties such as water repellency by copolymerizing the reinforcing layer 15 and the impact absorbing layer 16 with a polyurethane coating resin composition using a fluorine-containing diol for reinforcement of poor hydrolysis resistance and poor water resistance have.

To this end, the coating layer comprises a mixture of a low molecular weight diamine compound or a diol compound comprising from 15 to 20% by weight of a diol compound, from 15 to 20% by weight of a fluororesin-containing diol and from 60 to 70% by weight of polytetramethylene glycol (PTMG) (Dibutyltin dilaurate, DBTDL) added in an amount of 1 to 3 parts by weight per 100 parts by weight of the mixture of the diisocyanate and the diisocyanate, and the NCO / OH ratio of the diisocyanate is 1 to 3 And a water-repellent coating resin composition containing a diisocyanate as much as possible.

The operation of the cylindrical motor case for an automotive fuel pump motor according to an embodiment of the present invention will now be described.

The lower slider 31 is lifted to raise a part of the workpiece 10 for a motor case on the bottom surface of the storage tank up to the height of the intermediate pedestal 32, (32) and then descends.

The work 10 for the motor case transferred to the intermediate pedestal 32 is raised to the height of the swash plate 34 while the upper slider 33 rises and is transmitted to the swash plate 34 and then descends.

The motor case workpiece 10 transferred to the swash plate 34 is aligned in line through the alignment feeder 35 and is supplied while being moved forward by vibration.

When the case processing section 40 is operated by the control section 20, the transfer chuck 41 picks up a new work case for a motor case 10 from the case supply section 30 using the mounting tank 412, (42).

Subsequently, the transfer chuck 41 receives the machined workpiece 10 from the machining chuck 42 using the desorption tank 413 under the control of the control unit 20, ) Is rotated by 90 degrees and transferred to the processing chuck 42. The machining chuck 42 is rotated by 90 degrees. The fixing chuck 42 receives the workpiece 10 for a new motor case from the transfer chuck 41 and fixes it.

Next, the transfer chuck 41 rotates and discharges the work 10 for the motor case which has been machined to the desorption tank 413,

When the transfer chuck 41 rotates in order to discharge the motor case workpiece 10 as described above, the fixing chuck 42 starts to rotate the workpiece for the motor case 10 under the control of the controller 20, The bite portion 43 is moved toward the fixed chuck 42 and then the above-mentioned motor case workpiece 10 is processed.

The case processing section 40 is configured to fix the motor case workpiece 10 to the machining chuck 42 and control the inner side of the rear side of the motor case workpiece 10 by using the second bite 432 under the control of the control section 20. [ The step 13 is formed by cutting the face so that the step 14 is formed by cutting the inner surface of the front side of the motor case workpiece 10 by using the second bite 432 without changing the position of the motor case workpiece 10 .

On the other hand, a reinforcing layer 15, which is divided into a molded body and a fibrous material, is formed on the intermediate inner surface of the motor case workpiece 10 that has been processed and discharged.

The above fiber material is made of carbon fibers, connecting fibers, and reinforcing fibers. The carbon fibers, the connecting fibers, and the reinforcing fiber sheets are cut into a cylindrical shape and sequentially attached to the intermediate inner surface of the work case for a motor case.

Then, the impact absorbing layer 16 is formed on the reinforcing layer 15 described above.

The monolithic polymer composition is molded into a certain mold at a high temperature of 210 to 300 DEG C by casting mold or injecting mold with the composition of the above impact absorbing layer 16, As shown in Fig.

As described above, according to the embodiment of the present invention, both ends of the inner surface of the cylindrical motor case can be machined by one chucking without changing the position of the workpiece 10 for the motor case, 0.05 or less, and at the same time, it is not necessary to perform a separate washing step, thereby reducing the production cost. Further, by forming the reinforcing layer 15 and the impact absorbing layer 16 on the inner surface of the cylindrical motor case, the durability of the automotive fuel pump motor can be improved by protecting internal components of the cylindrical motor case from vibration and impact transmitted from the vehicle .

10: workpiece for motor case 20:
30: Case supply part 40: Case processing part

Claims (10)

A case machining portion for machining both ends of the work for a motor case supplied from the case supply portion by chucking one at a time, and a motor case workpiece fixed to the machining chuck of the case machining portion And a control unit for cutting the rear inner surface of the work for the motor case to form a step so as to cut the front inner surface of the work for the motor case using the bite without changing the position of the work for the motor case to form a step ,
The case supply unit may include a lower slider installed on one side of the storage tank for primarily lifting a work for a motor case, a lower slider fixed to the outer surface of the lower slider, An upper slider installed on an outer surface of the intermediate support to receive a work for a motor case from the intermediate support to thereby lift the work for the motor case, And a sorting feeder for receiving a work for a motor case from the swash plate and aligning and supplying the work for a motor case in a line,
The case processing unit includes a transfer chuck for transferring a machined work for a motor case from a machining chuck and transferring a new work for a motor case to a machining chuck, a workpiece for a motor case that has been machined to a transfer chuck, And a bite for machining an inner end surface and an outer end surface of a work for a motor case which is fixed and rotated to the above-mentioned workpiece chuck. Processing device for cylindrical motor case.
The method according to claim 1,
The upper surface of the lower slider, the intermediate pedestal, and the upper slider are inclined downward toward the outer surface,
Wherein an anti-slip coating layer is formed on the upper surface of the lower slider, the intermediate pedestal, and the upper slider.
3. The method of claim 2,
The anti-slip coating layer is composed of 50 ± 10% by weight of LLDPE, 30 ± 10% by weight of polypropylene (PP), and 20 ± 10% by weight of HPPE (High Density Poly Ethylene) And a non-slip function by coating the raw material. The method according to claim 1,
The transfer chuck is provided with an arm provided between the processing chuck and the butt portion for reciprocating rotation, a mounting trough provided at an end of the arm for transferring a new work for a motor case to the processing chuck, And a de-coating tank installed at an end of the mounting trough at an angle of 90 degrees with respect to the processing tank for receiving the machined workpiece for a motor case from the processing chuck,
Wherein a cushioning layer is coated on a portion of the mounting bar and the de-fitting tank that is in contact with the work for a motor case.
5. The method of claim 4,
The above-mentioned buffer layer is prepared by adding 70 to 80% by weight of paraffin oil, 14 to 20% by weight of a styrene-ethylene-propylene tri-block copolymer resin as a thermoplastic resin, 5 to 10% by weight of a hydrogenated resin with 1 to 2% by weight of an antioxidant Wherein the cylindrical motor case is formed by machining a cylindrical motor case for an automotive fuel pump motor.
Fixing the work for the motor case to the work chuck and then cutting the rear inner surface of the work for the motor case using the second bite to form a step,
And forming a step by cutting a front inner surface of the work for a motor case by using a second bite without changing the position of the work for a motor case, thereby forming a step.
The method according to claim 6,
Forming a molded body in contact with an intermediate inner surface of a work for a motor case and a reinforcing layer separated by a fiber material formed on the molded body on the intermediate inner surface of the work for a motor case,
An impact absorbing layer prepared by adding 70 to 80% by weight of paraffin oil, 14 to 20% by weight of a styrene-ethylene-propylene tri-block copolymer resin as a thermoplastic resin and 1 to 2% by weight of an antioxidant is formed on the reinforcing layer The method comprising the steps of: (a) forming a cylindrical motor case having a cylindrical shape;
8. The method of claim 7,
The method further comprises a step of forming a coating layer with a polyurethane coating resin composition by copolymerizing the reinforcing layer and the impact absorbing layer after the formation of the reinforcing layer and the impact absorbing layer by using a fluorine-containing diol for reinforcement of physical properties with poor hydrolysis resistance and water resistance Wherein the cylindrical motor case is made of a synthetic resin.
9. The method according to any one of claims 6 to 8,
The above-mentioned fibrous material is a main component of the reinforcing layer, and the carbon fiber and the reinforcing fiber, which form one layer respectively, penetrate through the connecting fibers vertically and have a higher melting point than the lattice thermoplastic synthetic fiber, and have a thickness of 15 to 30 denier. And 30 to 40 parts by weight of a material are mixed and processed, and then the processed sheet is punctured with needles, and the connecting fibers formed of the thermosetting synthetic fibers are connected between the carbon fibers and the reinforcing fibers. Method of machining cylindrical motor case for motor.
9. The method according to any one of claims 6 to 8,
The impact absorbing layer is prepared by dissolving an aluminum material in order to increase the strength in addition to the elastic restoring force and then transferring the dissolved aluminum to the agitation furnace for stirring with the impact absorbing layer composition and adding TiH2 as a foaming agent Method of machining cylindrical motor case for automotive fuel pump motor

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