KR102412261B1 - Method and apparatus for manufacturing bevel-type snap ring - Google Patents

Abstract

A bevel-type snap ring manufacturing apparatus related to the present invention includes the steps of: rolling a wire formed by means of a hard steel wire material to have a different cross-section including a bevel surface; forming a ring on the rolled wire rod to have a predetermined diameter through wire forming; Forming the wire-formed ring to have a predetermined inner diameter shape and a notch and a hole through press working; and performing planarization and surface treatment of the press-formed object.

Description

Bevel type snap ring manufacturing method and manufacturing apparatus

The present invention relates to a method and an apparatus for manufacturing a bevel type snap ring.

A snap ring (sometimes called a 'stop ring') makes a groove in the wall of a shaft or hole and inserts it into the groove through a slight elastic deformation (snap) in the groove, so that the shaft or the part inserted into the hole moves in the axial direction. The ring that stops the Snap rings are widely used in various mechanical fields such as automobile parts, electrical/electronics, and heavy industry. can be

Snap rings are divided into various types depending on the purpose and area of use. The double bevel type snap ring is configured to form a bevel on the surface of a general plate type snap ring in order to remove the clearance between the holding part and the adjacent surface, so that the bevel acts as a wedge by the spring action of the snap ring. When such a bevel-type snap ring is used in the driving part, it is necessary to prevent separation of the counterpart, so wear resistance and restoring force are important. In many cases, the finished product is manufactured through a process. The existing manufacturing method of the bevel-type snap ring is a method of producing the raw material of the coil in the form of a plate by primary press processing, secondary CNC processing to realize the bevel shape, and post-processing.

In the case of this existing production method, the material in the form of a plate is used as a material, which generates a lot of scrap and takes a long time for CNC machining to form an outside bevel. .

* Prior art

Korean Patent Registration No. 10-1776615 (Registered on Sep. 04, 2017)

Korean Patent Registration No. 10-1610633 (Registered on April 04, 2016)

Korean Patent Publication No. 10-2009-0028956 (published on March 20, 2009)

The present invention uses a wire rod as a material instead of using a plate and introduces a process such as wire forming instead of cutting to minimize the generation of scrap and improve productivity and quality. There is a purpose.

A bevel-type snap ring manufacturing apparatus related to the present invention includes the steps of: rolling a wire formed by means of a hard steel wire material to have a different cross-section including a bevel surface; forming a ring on the rolled wire rod to have a predetermined diameter through wire forming; Forming the wire-formed ring to have a predetermined inner diameter shape and a notch and a hole through press working; and performing planarization and surface treatment of the press-formed object.

As an example related to the present invention, the hard steel wire material may include SWRH62B or SWRH72B series.

As an example related to the present invention, the step of rolling the wire rod formed by the hard steel wire material to have a different cross section including a bevel surface includes the steps of: primary rolling the wire rod to have a primary thickness; secondary rolling the primary rolled wire rod to have a secondary thickness and a primary width; and tertiarily rolling the secondary-rolled wire rod to have tertiary thickness, secondary width, and the bevel surface.

As an example related to the present invention, the step of forming a ring so that the rolled wire rod has a predetermined diameter through wire forming processing includes the rolled wire rod into a helical coil shape with the predetermined diameter by wire forming processing. continuous processing; and cutting the continuously processed wire rod into the ring shape with one side open.

As an example related to the present invention, the step of forming the wire-formed ring to have a predetermined inner diameter shape and a notch and a hole through press working is to have the wire-formed ring have the predetermined inner diameter shape and notch Primary press working; and secondary press-drilling of the holes at both ends of the first press-worked ring.

As an example related to the present invention, in the step of secondary press-drilling the holes at both ends of the ring subjected to the primary press working, the direction of the burr during the secondary press-working is the primary press working. The method may further include pre-aligning the ring to match the orientation of the burrs of the ring.

As an example related to the present invention, the step of flattening and surface-treating the press-worked object may include: jig tempering by fixing the object in a plurality of stacked and pressurized states and maintaining it at a predetermined temperature for a certain period of time ; performing barrel grinding on the object subjected to jig tempering; and forming a phosphate film layer on the object that has undergone barrel polishing.

A bevel-type snap ring manufacturing apparatus related to the present invention includes: a rolling unit for forming a wire formed by using a hard steel wire material to have a different cross-section including a bevel surface; a wire forming unit for forming a ring on the rolled wire rod to have a predetermined diameter; a press working part formed to have a predetermined inner diameter shape and a notch and a hole with respect to the ring; and a post-processing unit for flattening and surface-treating the press-formed object.

As an example related to the present invention, the rolling unit may include: a first rolling unit for primary rolling the wire rod to have a primary thickness; a second rolling unit for secondary rolling the primary rolled wire rod to have a secondary thickness and a primary width; and a third rolling unit for tertiarily rolling the secondary-rolled wire rod to have a tertiary thickness, a secondary width, and the bevel surface.

As an example related to the present invention, the wire forming unit may be configured to continuously process the rolled wire rod into a helical coil shape with the predetermined diameter, and cut the continuously processed wire rod into the ring shape with one side open. can

As an example related to the present invention, the press working unit, a first press working unit for forming the wire-formed ring to have the predetermined inner diameter shape and notch; And it may include a secondary press working part for drilling the hole at both ends of the ring formed with the inner diameter shape and the notch.

As an example related to the present invention, the press working unit may include such that the direction of a burr during processing of the second press working unit coincides with the direction of the burr of the ring processed through the first press working unit. It may further include an alignment unit for pre-aligning the .

As an example related to the present invention, the post-processing unit may include: a jig tempering unit configured to fix the object in a plurality of stacked and pressurized states and maintain it at a predetermined temperature for a predetermined time; a barrel polishing unit configured to polish the surface of the object that has undergone jig tempering; and a surface treatment unit for forming a phosphate film layer on the object subjected to barrel polishing.

According to the method and apparatus for manufacturing a bevel type snap ring related to the present invention, a wire formed of a hard steel wire material is rolled to have a different cross section including a bevel surface, a ring is formed through wire forming processing, and then an inner diameter shape is performed by press working. And by including the step of forming a notch, separate cutting processing for forming the bevel surface is not accompanied, and since the ring shape is produced through wire forming processing, the generation of scrap is significantly reduced, raw material cost and logistics handling for the same The cost of processing can also be reduced, and as a result, there is an advantage in that the processing cost can be reduced. In addition, the shape precision of the bevel surface is improved, and the uniformity can be improved through wire forming.

1 is a perspective view showing an example of a bevel-type snap ring related to the present invention.
2 is a conceptual diagram illustrating a method for manufacturing a bevel type snap ring according to an example related to the present invention.
3 to 4 sequentially show the rolling processes of the wire rod for manufacturing the bevel-type snap ring related to the present invention,
3 is a first rolling step,
4 is a secondary rolling step,
5 is a third rolling step.
6 is a schematic front view of the wire forming unit 40 related to the present invention.
7 is a view conceptually illustrating manufacturing a ring from a wire that has undergone a rolling process using the wire forming unit 40 of FIG. 6 .
8 is a conceptual diagram showing a part to be cut or pierced through press working in relation to the present invention separated from other parts.
9 is a side view schematically showing a state (7) in which the bevel-type snap ring (6) is pressed and laminated to perform jig tempering in relation to the present invention.
10 is a photograph showing the inspection device 70 for inspecting the flatness of the bevel type snap ring 10 molded in relation to the present invention.
11 is a photograph showing an inspection device 80 for measuring the dimensions of the bevel type snap ring 10 molded in relation to the present invention.
12 is a chart showing a comparison of the scrap generation results of the bevel type snap ring according to the manufacturing method related to the present invention and the bevel type snap ring according to the existing manufacturing method.

Hereinafter, a bevel type snap ring manufacturing method and manufacturing apparatus related to the present invention will be described in detail with reference to the accompanying drawings.

In the present disclosure, in order to solve the problems that occur in the manufacturing process of the existing bevel-type snap ring, instead of the conventional method of making a bevel shape and ring by pressing or CNC processing a plate material as a raw material, the bevel surface is used as a raw material of the wire rod. It includes a method in which scrap is not fundamentally generated until notched processing by forming a ring in advance to have it and wire forming through wire forming. As a specific technique for this, a high-precision drawing or rolling process having a tapered shape, wire forming to ensure uniformity, a press process to prepare the inner diameter shape and notch of the snap ring, flattening and post-treatment of the surface Related processes and inspection processes to increase product reliability were suggested.

As shown in FIG. 1 , the bevel type snap ring 10 includes a notch-shaped portion 11 and a perforated hole 12 , but unlike a general snap ring, it includes a bevel surface 11 having a tapered shape along the edge of the body. The bevel-type snap ring 10 serves to connect the turbine-side housing and the compressor-side housing of the turbocharger engine for automobiles, and to reduce vibration and noise by the bevel surface 11 . This bevel-type snap ring 10 is configured to secure wear resistance and recovery from friction or impact with an adjacent or contact counterpart. In terms of shape, the manufactured bevel-type snap ring 10 is designed to have a height of 1.78±0.80 mm of the bevel surface 11 and an angle of 15±3° of the bevel surface 11 .

2 is a conceptual diagram illustrating a method for manufacturing a bevel type snap ring according to an example related to the present invention. The manufacturing process of the bevel type snap ring related to the present invention may include a rolling step (S10), a wire forming step (S20), a press working step (S30) and a post-processing step (S40). The state of the equipment or object for the implementation of each step will be described with reference to FIGS. 3 to 9 .

The rolling step (S10) is a process of rolling the wire formed of the hard steel wire material to have a different cross section including the bevel surface described above. The material of the bevel-type snap ring in the present invention may use a hard steel wire of SWRH62B or SWRH72B series, unlike using a plate material. In the case of the conventional method of using a plate material as a raw material, carbon steel (SK5M) is used, which is not suitable for rolling, whereas the SWRH62B or SWRH72B series hard steel wire has a similar amount of carbon but has an excellent advantage in elongation.

In the rolling step (S10), a hard steel wire having a normal cross-sectional shape is rolled to convert it into a material of a different cross-section having a bevel surface for manufacturing a snap ring. To this end, the rolling step ( S10 ) includes a step of forming a primary thickness of the wire rod 1 by using the first rolling part 31 (see FIG. 3 ), and a second step of the primary rolled wire rod 2 . A step of secondary rolling to have a secondary thickness and a primary width by using the rolling unit 32 (see FIG. 4 ), and a tertiary rolling of the secondary rolled wire 3 using a third rolling unit 33 . It may include a step of third rolling to have a thickness, a secondary width, and a bevel surface (3a) (see FIG. 5). The third rolled portion 33 has a bevel surface forming portion 33a for finally forming the bevel surface 3a. The first rolling unit 31 , the second rolling unit 32 , and the third rolling unit 33 may be disposed adjacent to each other to facilitate a continuous process. In the rolling step (S10), an appropriate tool may be applied in consideration of the change in the angle and cross-sectional shape of the bevel surface.

Through the rolling step (S10), the material becomes a wire of a different cross-section having a bevel surface. Next, in the wire forming step (S20), the wire rolled by the wire forming unit 40 (refer to FIG. 6) is manufactured in a ring shape to have a predetermined diameter. The wire forming step (S20) includes the steps of continuously processing the rolled wire rod into a helical coil shape with a predetermined diameter by wire forming processing (S21), and cutting the continuously processed wire rod into a ring shape with one side open (S22). ) may be included. The wire forming unit 40 may include an uncoiler and a feeder unit, a leveler, a servo motor, a pitch slide unit, a cutting unit, and the like (detailed reference numerals are omitted in FIG. 6 ). Accordingly, as shown in FIG. 7 , a continuous workpiece 4 of a helical shape can be formed by using a wire rod with a predetermined diameter, and the ring 5 with one side open is manufactured by cutting it to a predetermined length. Both the continuous workpiece 4 and the ring 5 are in a state having the bevel surfaces 4a and 5a formed during the previous rolling step S10.

In the wire forming step (S20), the inner side becomes thicker and the outer side becomes thinner depending on the inner compressive stress and outer tensile stress generated in the process of changing the linear material into a ring shape, so the rolling step (S10) The final thickness or width of the wire can be adjusted so that it can be processed to fit the final dimensions of the wire forming. That is, the final dimension of the wire rod in the rolling step (S10) may be changed or adjusted to match the final dimension when the wire forming step (S20) is passed.

The wire forming unit 40 for the wire forming step (S20) may function as a dedicated facility for making a ring material having a bevel surface. A ring with an optimal bevel surface is formed by setting the feed, pitch, position of each axis, and working conditions to manufacture a continuously machined helical-shaped ring.

The rings 4 and 5 on which the wire forming is completed are then subjected to a press working step (S30). In the press working step (S30), a predetermined inner diameter shape, a notch and a hole are formed with respect to the wire-formed ring. Specifically, the press working step (S30) is a step (S31) of performing a primary press to have a predetermined inner diameter shape and a notch on the cut ring 5, and drilling holes at both ends of the primary press working ring It may include a secondary press step (S33). At this time, as shown in FIG. 8 , there is almost no part to be cut on the outer periphery of the ring 5 on which the bevel surface 5a is already formed, and the cutout portion 5b and the chamfered portion 5c for forming a notch on the inner periphery are scrap is created with After the step of performing the first press (S31), burrs generated in the cut-out portion 5b and the chamfered portion 5c occur when the hole 5d is drilled in the second pressing step (S33) A step (S32) of pre-aligning the ring (5) may be included between the first pressing step (S31) and the second pressing step (S33) so that the direction is not crossed with the burr. To this end, the pre-alignment unit may be provided with a means to guide the ring to be taken out in a certain direction in the primary press so that the directions are not staggered.

In the post-processing step (S40), the press-worked object is planarized and surface-treated. Specifically, in the post-processing step (S40), as shown in FIG. 9 , a plurality of objects 6 processed in the form of a bevel-type snap ring are stacked and pressed in a state (7), and a predetermined temperature using a tempering furnace A step of performing jig tempering by maintaining the furnace for a certain period of time (S41), performing barrel polishing on the object subjected to jig tempering (S42), and forming a phosphate film layer on the object subjected to polishing (S43) may be included.

Through the jig tempering step (S41), it is possible to secure a flatness of a certain standard (eg, 0.2 mm) and increase the toughness of the product.

[Example 1]

Jig tempering temperature (℃) : 300 ~ 350, holding time (hr) : 1 ~ 5

In the barrel polishing step (S42), foreign substances generated during surface oxidation or product process are removed, and a constant roughness quality is secured before surface treatment. The film layer forming step (S43) is configured to obtain a final product having the appearance of the product and the thickness of the coating film while having corrosion resistance.

As the material is changed from conventional carbon steel to SWRH62B or SWRH72B series, heat treatment conditions can be appropriately changed (see Table 1 below).

Austenitizing
Temperature(℃) Austenitizing
Time(min) Austempering
Temperature(℃) Austempering
Time(min) 830 to 880 10 300 to 350 10 to 100

10 is a photograph showing the inspection device 70 for inspecting the flatness of the bevel type snap ring 10 molded in relation to the present invention.

For the inspection of the flatness, the inspection device 70 may be configured to measure the flatness by sensing a table on which an optical sensor is mounted on a slot in the process of the manufactured snap ring 10 sliding along the table. .

11 is a photograph showing an inspection device 80 for measuring the dimensions of the bevel type snap ring 10 molded in relation to the present invention.

For the inspection of dimensions, the inspection device 80 may be configured to measure the jig 10 having a magnetism by means of an optical sensor for easy handling.

In addition to the inspection equipment 70 and 80, various devices and technologies for evaluating the characteristics of a product may be applied.

12 is a chart showing a comparison of the scrap generation results of the bevel type snap ring according to the manufacturing method related to the present invention and the bevel type snap ring according to the existing manufacturing method.

In order to produce products having the same dimensions, the input material is 0.18 kg according to the existing method using press working and CNC machining, whereas according to the manufacturing method related to the present invention, it is 0.06 kg, which is 1/3 of the scrap. The incidence is less than 1/5 from 0.146 kg to 0.026 kg. Therefore, it can be seen that the utilization rate of the material is also significantly improved to 18.9% according to the existing method, but 56.7% according to the method related to the present invention.

The bevel type snap ring manufacturing apparatus and manufacturing method described above are not limited to the configuration and method of the described embodiments. The above embodiments may be configured by selectively combining all or part of each of the embodiments so that various modifications can be made.

1: Wire rod 2: Primary rolled wire rod
3: secondary rolled wire rod 3a: bevel surface
4: Helical ring 5: Cut ring
7: Jig Tempering Laminate
10: Bevel type snap ring 11: Notch
12: perforated hole 13: bevel surface
31: first rolling unit 32: second rolling unit
33: third rolling unit 40: wire forming unit
70: flatness inspection unit 80: dimension inspection unit

Claims (14)

rolling a wire rod formed of a hard steel wire material to have a different cross section including a bevel surface;
forming a ring on the rolled wire rod to have a predetermined diameter through wire forming;
Forming the wire-formed ring to have a predetermined inner diameter shape and a notch and a hole through press working;
A step of flattening and surface-treating the press-worked object, including,
The step of flattening and surface-treating the press-worked object,
jig tempering by fixing the object in a plurality of stacked and pressurized states and maintaining it at a predetermined temperature for a certain period of time;
performing barrel grinding on the object subjected to jig tempering; and
Forming a phosphate film layer on the object that has undergone barrel polishing, including,
The step of rolling the wire rod formed in the hard steel wire material to have a different cross section including a bevel surface,
first rolling the wire rod to have a primary thickness;
secondary rolling the primary rolled wire rod to have secondary thickness and primary width; and
A step of tertiarily rolling the secondary-rolled wire rod to have tertiary thickness, secondary width, and the bevel surface,
The step of forming a ring to have a predetermined diameter by wire forming the rolled wire rod,
continuously processing the rolled wire rod in the form of a helical coil to the predetermined diameter by wire forming; and
Cutting the continuously processed wire rod into the ring shape with one side open,
Forming the wire-formed ring to have a predetermined inner diameter shape and a notch and a hole through press working,
Primary press working to have the predetermined inner diameter shape and notch in the wire-formed ring; and
Comprising the step of secondary press-drilling the holes at both ends of the primary press-worked ring,
The step of secondary press-drilling the holes at both ends of the primary press-worked ring,
Pre-aligning the ring so that the direction of the burr during the secondary press drilling coincides with the direction of the burr of the ring subjected to the primary press work;
After the step of forming a phosphate film layer on the object that has undergone the barrel polishing,
A step of measuring the flatness by sensing a table on which an optical sensor is mounted on a slot while the object moves along the table; and
Attaching the object to a jig having a magnetic jig further comprising the step of measuring the size by an optical sensor, a bevel-type snap ring manufacturing method.
According to claim 1,
The hard steel wire material includes a SWRH62B or SWRH72B series, a bevel type snap ring manufacturing method.
delete delete delete delete delete a rolling unit for forming a wire formed of a hard steel wire material to have a different cross section including a bevel surface;
a wire forming unit for forming a ring on the rolled wire rod to have a predetermined diameter;
a press working part formed to have a predetermined inner diameter shape and a notch and a hole with respect to the ring; and
A post-processing unit for flattening and surface-treating the press-worked object, wherein the post-processing unit comprises:
a jig tempering unit configured to fix the object in a plurality of stacked and pressurized states and maintain it at a predetermined temperature for a certain period of time;
a barrel polishing unit configured to polish the surface of the object that has undergone jig tempering; and
A surface treatment unit for forming a phosphate film layer on the object subjected to barrel polishing,
The rolling part,
a first rolling unit for primary rolling the wire rod to have a primary thickness;
a second rolling unit for secondary rolling the primary rolled wire rod to have a secondary thickness and a primary width; and
A third rolling part for tertiarily rolling the secondary-rolled wire rod to have tertiary thickness, secondary width, and the bevel surface,
The wire forming unit is configured to continuously process the rolled wire rod into a helical coil shape with the predetermined diameter, and cut the continuously processed wire rod into the ring shape with one side open,
The press working part,
a first press working part for forming the wire-formed ring to have a predetermined inner diameter shape and a notch; and
A secondary press working part for drilling the hole at both ends of the ring in which the inner diameter shape and the notch are formed,
The press working part,
Including an alignment part for pre-aligning the ring so that the direction of the burr during processing of the second press working part coincides with the direction of the burr of the ring machined through the first press working part,
a first inspection unit for measuring flatness by detecting a table on which an optical sensor is mounted on a slot while the object moves along the table; and
Further comprising a second inspection unit configured to attach the object to a magnetic jig to measure a dimension by an optical sensor, bevel-type snap ring manufacturing apparatus.
9. The method of claim 8,
The hard steel wire material includes a SWRH62B or SWRH72B series, a bevel type snap ring manufacturing apparatus.
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