KR102251900B1 - Core for spring forming machine - Google Patents

Abstract

The present invention provides a core metal with precision and excellent surface roughness and abrasion resistance so that it is possible to elaborately mold an extrusion spring, and it is possible to continuously produce excellent and uniform quality, and to maximize production efficiency by increasing the durability of the core metal while maintaining maintenance. As a way to significantly reduce the cost and time required for;
A core metal body having a length relatively long compared to the width and height by wire-cutting a plate-like member of a carbide material having a thickness equal to the length of the core metal to have a desired shape to form a core metal body mounted on the spring forming machine;
The core body includes a vertical surface formed in a direction perpendicular to the longitudinal axis center; A horizontal plane formed above the vertical plane; An inclined surface formed to be inclined downward to one side below the vertical surface; It is characterized in that a forming surface formed in an arc shape is formed integrally between the left end of the horizontal surface and the left end of the inclined surface so as to form the compression spring with the same outer diameter as the inner diameter surface of the compression spring to be formed. do.

Description

Core for spring forming machine {CORE FOR SPRING FORMING MACHINE}

The present invention relates to a core metal for a spring molding machine, and more particularly, a core metal that enables the shape of a spring to be formed when forming a compression spring can be obtained simply and precisely, thereby enabling rapid setting of the spring molding machine while forming It relates to the provision of a core that allows the quality of the spring to be maintained evenly and excellently.

In general, compression springs are formed by supplying a wire rod, winding the wire through the cooperation of the core metal (mold) and the coiling tool, cutting it with a cutter, and discharging it.The pitch interval of the spring is adjusted according to the winding speed and It is well known that the diameter of the spring is determined according to the outer diameter.

The prior art of the spring molding machine as described above will be described in the patent literature as follows.

Patent document 1 is a wire rod supply mechanism for supplying a steel wire rod with a plurality of pairs of feed rollers, a heating mechanism for heating the steel wire rod, a coiling mechanism for shaping the heated steel wire rod into a coil shape, and a predetermined number of turns. A cutting mechanism for jointing the coiled steel wire rod with the steel wire rod at the rear is provided, and the coiling mechanism is for guiding the steel wire rod supplied by the feed roller to an appropriate position of the processing unit. A wire guide, a coiling tool for processing the steel wire material supplied via the wire guide into a coil shape, and a pitch tool for imparting a pitch of the coil shape, and the cutting mechanism includes a predetermined number of turns coiling A cutting blade for joining the coil to the rear of the steel wire rod, and a support blade disposed opposite to the cutting blade to support the steel wire rod, and a region for heating the steel wire rod by the heating mechanism includes the feed roller and It is installed in the middle of the wire guide, the cutting blade, when cutting the steel wire, the speed toward the direction of the support blade (Va) and the speed toward the axial direction of the coiled steel wire (Vc) It is characterized in that it forms a trajectory provided with.

Patent Document 2 is a spring forming apparatus in which a plurality of guide rollers are attached to each of the entrance, middle, and exit portions for forming a trapezoidal coil spring,

The guide hole coupled to the upper side of the support is fastened by a plurality of bolts, and the angle of the wire rod is adjusted by adjusting the front and rear directions of the bolt, and the wire rod is inserted into the groove formed in the guide hole and is formed into a polygonal wire rod. Together, it is characterized in that the coiling point applies pressure to the surface of the wire rod so that the wire rod can be wound around the center rod.

Patent application No. 10-2016-7012009 Patent No. 10-0368070-0000

None.

In the spring forming machine as described above, the core metal that cooperates with the coiling tool to spirally wind the wire rod supplied with the core parts plays an important role.In this case, the cross section is not circular but in an eccentric state. It is structured close to a semicircular shape.

For this reason, a lot of difficulties are encountered in the process of making such a core, as well as a lot of inconvenience in maintenance in the process of using the spring molding machine, and a look at these specific details is as follows.

Looking at the core 1 to which the prior art is applied through FIG. 7, a vertical surface 3 cut vertically from the center of the axis on both sides of the cylindrical core 2 and a horizontal surface formed on the upper side of the vertical surface 3 (4) And to form an inclined surface 5 obliquely from the lower side of the vertical surface (3).

The vertical surface 3 and the arc-shaped forming surface 6 are formed to be biased to the counteracting teeth, and the entering wire is guided to form the inner diameter surface of the compression spring, and the forming surface is formed so that it can be coiled and formed, and the forming surface ( In the opposite position of 6), a cutting space 7 is formed through which the cutter can enter so that the molded spring can be cut.

Since the cross-sectional shape of the core is not in a round shape, it is practically difficult to process it accurately and quickly using a professional processing machine, so when the overall shape is initially completed, the operator directly creates a shape designed (purpose) by hand. Since it is processed, it takes a lot of time to process, and it is difficult to maintain precision and it is difficult to maintain a uniform surface roughness.

As such precise processing becomes difficult, in the process of actually making a compression spring, when the surfaces of the wire rod and the core metal cause friction, it causes damage to the inner diameter of the spring, and the diameter of the spring becomes uneven or the pitch becomes uneven. It causes problems.

As the diameter of the wire rod used to make the spring is very small and the size of the spring is small, this problem is encountered. In the end, productivity is lowered, as well as the exchange cycle becomes faster due to the wear of the core metal, and the process of replacing the core metal. In addition, since it takes a considerable amount of time to remove, install, and set for accurate matching, the idle time of the molding machine is prolonged, which is the cause of lowering the overall productivity.

In particular, if the size of the spring is small, although it must be made precisely, the core metal is processed and heat treated using a carbide tip with a general metal material. However, the shape of the spring is not precise and the surface roughness is not uniform and is rough. It is a situation that is not free from various problems such as a disruption in production.

Accordingly, in the present invention, as invented to solve the above problems, the core metal 110 mounted on the spring molding machine 100 is formed into a plate-shaped member made of carbide having a thickness equal to the length of the core metal 110. By cutting the wire so as to have a length (L) compared to the width (B) and height (H) to configure the core body 115 having a relatively long bar shape;

The core body 115 includes a vertical surface 116 formed in a direction perpendicular to the longitudinal axis center P; A horizontal surface 117 formed above the vertical surface 116; An inclined surface 118 formed to be inclined downward to one side below the vertical surface 116; Between the left end (HLE) of the horizontal surface 117 and the left end (SLE) of the inclined surface 118, the compression spring has the same outer diameter (OD) as the inner diameter surface of the compression spring to be formed in an arc shape to form a compression spring. Characterized in that it comprises a forming surface 119 to form;

It is possible to precisely mold the extruded scroll by providing the core metal with high precision and excellent surface roughness and abrasion resistance, and it is possible to continuously produce excellent and uniform quality, and to maximize the production efficiency by increasing the durability of the core metal, which is necessary for maintenance. It is possible to achieve the goal of drastically reducing cost and time.

The present invention makes the shape of a core metal by wire cutting a carbide material, and maintains the same degree as the surface to be subjected to surface roughness through a lapping process on the surface thereof, thereby increasing the precision while maintaining durability. It has the effect of enabling molding.

The present invention enables the core metal to be processed with precision and durability, thereby significantly reducing wear in the spring forming process and prolonging the lifespan, thereby reducing the time and cost required for maintenance and setting of the core. Has an effect.

The present invention is an invention having various effects, such as being able to produce small and precise compression springs to maintain uniform quality due to the precision and durability of the core, and to maximize production efficiency, thereby enhancing external competitiveness.

1 is an external perspective view of a spring forming machine shown to explain the technology of the present invention.
Figure 2 is a broken perspective view of the spring forming machine shown to explain the technology of the present invention.
3 is a perspective view showing the appearance of the core of the spring forming machine to which the technology of the present invention is applied.
Figure 4 is a cross-sectional view of the A-A line showing the core of the spring forming machine to which the technology of the present invention is applied.
Figure 5 is a cross-sectional view of the B-B line showing the core of the spring forming machine to which the technology of the present invention is applied.
6 is a cross-sectional view of an enlarged and excerpted core surface of a spring forming machine to which the technology of the present invention is applied.
7 is a configuration diagram showing a core for a spring forming machine to which the prior art is applied.

Hereinafter, a preferred configuration and operation of the present invention for achieving the above object will be described with reference to the accompanying drawings.

1 is an exterior perspective view of a spring molding machine shown to explain the technology of the present invention, FIG. 2 is a broken perspective view of the spring molding machine shown to explain the technology of the present invention, and FIG. 3 is a spring molding machine to which the technology of the present invention is applied. A perspective view showing the appearance of the core, FIG. 4 is a cross-sectional view showing the core of a spring molding machine to which the technology of the present invention is applied, and FIG. 5 is a cross-sectional view showing the core of a spring molding machine to which the technology of the present invention is applied A cross-sectional view taken along line B, FIG. 6 is an enlarged cross-sectional view of the core metal surface of a spring molding machine to which the technology of the present invention is applied.

A typical spring forming machine 100 receives the power of a driving motor 102 installed at one rear side of a forming machine body 101 provided in a schematic box type, and takes a wire rod from a winding roll winding a wire rod for making a compression spring. It is provided with a feeding portion 105 having a pair of feeding rollers (103, 104) to supply.

At the opposite position of the feeding part 105, a wire rod supplied while moving forward and backward by an operating means 106 such as a cylinder or a motor is coiled together with the core 110 to form a compression spring. A molding tool 108 with 107 is installed.

A cutter 109 for cutting the molded compression spring to a desired length is installed at a position below the molding machine body 101 between the feeding part 105 and the molding tool 108, and the feeding part 105 and the molding tool Between (108), the core metal 110 for coiling the wire rod together with the forming tool 108 is held in the core gold block 111, and the ejector pin 112 is protruded toward the front of the core 110 to be completed. It is configured to discharge the compressed spring.

In the present invention, a plate-like member made of a carbide material having a thickness equal to the length of the core 110 is subjected to wire cutting to have a desired shape to obtain a dimension processing.

The core 110 obtains a core body 115 having a relatively long bar shape with a length (L) compared to the width (B) and the height (H). The simple dimensions are about 20 mm in length and approximately in height. It has a very fine size of 2.5mm and a width of about 1.5mm.

At this time, the overall shape of the core body 115 forms a vertical surface 116 in a direction perpendicular to the longitudinal axis center P, and a horizontal surface 117 is formed on the upper side of the vertical surface 116, and the vertical surface ( 116) is formed with an inclined surface 118 inclined downward to one side (to the left as viewed in Fig. 3), and between the left end (HLE) of the horizontal surface 117 and the left end (SLE) of the inclined surface 118 The arc-shaped molding surface 119 is formed so that the compression spring can be formed with the same outer diameter (OD) as the inner diameter surface of the compression spring to be molded.

In the longitudinal axis center P of the core body 115, an ejector pin hole 120 for fixing the ejector pin 112 for taking out the completed compression spring is formed to penetrate, which is separate from wire cutting. It should be formed through processing of.

On the outer surface of the core body 115, in particular, lapping is performed to improve durability (abrasion resistance) while maintaining the roughness of the molded surface 119 precisely with the desired dimension.

The lapping may be performed over the entire core body 115 or may be performed by focusing on the molding surface 119 in particular.

The lapping is performed by lubricating a fine powder type of silicon carbide, alumina oxide, iron oxide, chromium oxide, fluorocarbon, and diamond powder on the surface of the core body 115 to scratch or damage the surface of the core body 115. It is possible to maintain the roughness of about 1/10,000mm by grinding with a dedicated ramping machine or device using wrapping oil to prevent this, so that it is possible to have precision and high hardness in the same state as the mirror surface.

When the lapping is performed in this way, the processing surface is smooth like a mirror surface because the wrapping material 130 is filled and flattened in the fine voids or irregularities 125 generated on the surface of the core body 115 formed by wire cutting. , The machined surface is hard and can be mass-produced, the lubricity, durability and precision of the machined surface are high, and it has the advantage of being able to process regardless of shape and shape.

The use of the core 100 for a spring forming machine to which the technology of the present invention is applied as described above is used by being mounted on the core block 111 constituting the spring forming machine 100 as in the prior art.

When the wire rod is supplied through the feeding part 105 provided on one side of the core 110,. Since the forming tool 108 at the opposite position of the feeding part 105 is in a controlled state at a position adjacent to the core 110, the wire rod is moved along the forming surface 119 of the core 110 and then the forming tool 108 ) Is guided and coiled by the set pitch, and molded with compression springs.

When the compression spring of the desired size is formed, the coiling operation is stopped, the cutter 109 is operated to cut the compression spring, and the discharged operation through the ejector pin 112 coupled to the front of the core 110 is repeated. Compression springs are made continuously.

In the process of forming a compression spring as described above, in the case of the present invention, in the case of the present invention, the core metal 110 is formed into a shape by wire-cutting a plate-like member of a carbide material, and the surface thereof is wrapped to precisely maintain the roughness while maintaining durability and wear resistance Because it is configured, precise molding is possible.

This maintains a precise processing state even when obtaining the core metal 110 by wire-cutting a plate-like member of a carbide material, but the surface is filled by penetrating fine voids or grooves that may occur on the surface through ramping. Since it maintains the same state as the mirror surface, in the end, when forming the compression spring by coiling, it is possible to form the compression spring in the same state as the dimension while being precise.

In addition, since the surface roughness is good by lapping, it is excellent in lubricity and abrasion resistance, which makes it advantageous not only to coil the wire, but also to keep the roundness and peaky spacing of compression springs that require small and precise things consistently. It is possible to minimize the damage to the outer surface of the compression spring, and to maximize the productivity by minimizing the revolution rate of the spring forming machine by lengthening the exchange period of the core 110.

The present invention as described above provides a core metal with precision and excellent surface roughness and abrasion resistance, so that it is possible to elaborately mold the extrusion spring, and it is possible to continuously produce excellent and uniform quality, and to maximize the production efficiency by increasing the durability of the core metal. It has the advantage of being able to drastically reduce the cost and time required for maintenance and repair.

100; Spring molding machine
101; Molding machine body
105; Feeding part
108; Molding tool
109; cutter
110; heartstrings
111; Heart Gold Block
115; Heart Gold Body
116; Vertical plane
117; water level
118; incline
119; Forming side
120; Ejector pinhole

Claims (3)

Compared to the width (B) and the height (H) by wire cutting to form a plate-shaped member of cemented carbide having a thickness equal to the length of the core metal (110), which is mounted on the spring molding machine (100). The length (L) constitutes a core body 115 having a relatively long bar shape;
The core body 115 includes a vertical surface 116 formed in a direction perpendicular to the longitudinal axis center P; A horizontal surface 117 formed above the vertical surface 116; An inclined surface 118 formed to be inclined downward to one side below the vertical surface 116; Between the left end (HLE) of the horizontal surface 117 and the left end (SLE) of the inclined surface 118, the compression spring has the same outer diameter (OD) as the inner diameter surface of the compression spring to be formed in an arc shape to form a compression spring. Core metal for a spring molding machine, characterized in that the forming surface 119 to be formed is integrally formed at a time. The method of claim 1;
The core metal for a spring molding machine, characterized in that an ejector pin hole 120 for fixing the ejector pin 112 for taking out the finished compression spring is formed to pass through the longitudinal axis center P of the core body 115 . The method of claim 1;
A core metal for a spring molding machine, characterized in that lapping for flattening is performed by filling the wrapping material 130 in the fine voids or irregularities 125 generated on the surface of the core body 115.

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