Mold and impact cutting device using the mold

Abstract

We provide molds that enable highly efficient processing. [Solution] A mold 1 comprising at least a movable die 12, a punch 11 that transmits a force to drive the movable die 12 vertically downward, a return mechanism positioned vertically below the movable die 12 that returns the movable die 12 to a predetermined position, a fixed die 13, and a holding mechanism, wherein the movable die 12, the punch 11, the fixed die 13, the return mechanism, and the holding mechanism are unitized within the mold.

Description

Technical Field

[0001] The present invention relates to a mold and an impact cutting device using the mold.

Background Art

[0002] The sprags incorporated in a one-way clutch are processed by methods such as a grinding wheel cutting method or an impact cutting method.

[0003] Patent Document 1 discloses a tool device for high-speed machining composed of a striking unit, a tool housing portion, and a shock absorber. The shock absorber is provided with an adjustment mechanism for adjusting attenuation, and the attenuation of the shock absorber can be adjusted to a desired value so as to decelerate the striking motion of the movable cutting tool housed in the tool housing portion. Further, the axial position of the fixed cutting tool housed in the tool housing portion can be adjusted and changed by changing the position of the clamping screw.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the tool device disclosed in Patent Document 1, although the attenuation by the shock absorber can be adjusted, there is a limit to the return speed of the cutting tool and it cannot follow high-speed motion. Further, changing the position of the clamping screw to adjust and change the axial position of the cutting tool requires skilled technique.

[0006] An object of the present invention is to provide a mold capable of machining with high efficiency.

Means for Solving the Problems

[0007] To achieve the above objective, the mold of the present invention comprises at least a movable die, a pressing member that transmits a force to drive the movable die vertically downward, a return mechanism positioned vertically below the movable die that returns the movable die to a predetermined position, a fixed die, and a holding mechanism, wherein the movable die, the pressing member, the fixed die, the return mechanism, and the holding mechanism are unitized within the mold. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a mold that can be processed with high efficiency. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic perspective view of mold 1. [Figure 2] This is a schematic front view of mold 1. [Figure 3] This is a cross-sectional view of mold 1 along the cross-sectional line III-III in Figure 2. [Figure 4] This is a perspective view of the correction liner 21. [Figure 5] This is a cross-sectional view of the discharge guide 28. [Figure 6] (A) A schematic diagram of the impact cutting device 100 that drives the mold 1. (B) A diagram showing the crank motion with a crank angle α. [Figure 7] (A) This diagram shows the relationship between crank angle α and press slide displacement / downward speed. (B) This diagram shows the relationship between crank angle α and press slide displacement / mold press load. [Figure 8] This is a schematic diagram of the configuration of an impact cutting device 100 equipped with two grippers. [Modes for carrying out the invention]

[0010] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. In the drawings, identical parts are indicated by the same reference numerals. In this specification, "up and down" simply refers to the upward and downward directions in the direction of gravity, respectively.

[0011] Figure 1 is a schematic perspective view of the unitized mold 1 according to the present invention, and Figure 1 omits the description of the left and right side blocks 17L and 17R, discharge mechanism, liner, etc., which will be described later. Figure 2 is a schematic front view of the unitized mold 1, and Figure 2 omits the description of the discharge mechanism. Figure 3 is a cross-sectional view of the unitized mold 1 along the cross-sectional line III-III in Figure 2. The mold 1 of the present invention will be described in detail with reference to Figures 1 to 3.

[0012] The mold 1 of the present invention is used when processing a linear material M by high-speed pressing (high-speed impact cutting), and a sprag incorporated into a one-way clutch is processed from the material M. The impact cutting method is not limited to sprags but is a method that can be applied to cutting wire materials in general, and the resulting fracture surface can be formed with excellent perpendicularity and a smooth surface, making it possible to distinguish it from counterfeit products.

[0013] The mold 1 of the present invention comprises at least a movable die 12, which is a main component; a punch 11 (pressing member) that transmits a force to drive the movable die 12 vertically downward; a return mechanism located vertically below the movable die 12 that returns the movable die 12 to a predetermined position; a fixed die 13; and a holding mechanism. The punch 11 drives the movable die 12 vertically downward in Figure 1, applying an impact load to the movable die 12, thereby impact cutting a linear material M to produce a sprag. The impact load is applied by a press slide of a high-speed press device (not shown), etc.

[0014] The movable die 12 has a roughly rectangular shape, with a recess 12b, a through hole 12c, and a cutting edge (not shown) located roughly in the center. In the direction in which the material M flows, a fixed die 13 is positioned upstream of the movable die 12, and a discharge guide 28 (discharge mechanism) is positioned downstream of the movable die 12. Left and right side blocks 17L and 17R are positioned on the left and right sides of the movable die 12. A stopper 18 is positioned at the lower vertical part of the movable die 12 and is fixed to the base material 10.

[0015] (Regarding the return mechanism) The return mechanism for returning the movable die 12 to its predetermined position consists of left and right rocker arms 14L and 14R (arm members), left and right springs 15L and 15R, and left and right screw plugs 16L and 16R. As shown in Figure 2, the return mechanism has a symmetrical configuration along the cross-sectional line III-III, and the left and right configurations have the same function. Although the left and right configurations are shown in the drawing, the description below will focus on the left rocker arm 14L, etc., while omitting the description of the right rocker arm 14R, etc.

[0016] The left rocker arm 14L is positioned to the left of the movable die 12, and the contact point 14La on the upper surface of one end of the left rocker arm 14L abuts against the lower surface 12a of the movable die 12. The lower surface 14Lb opposite to the contact point 14La on the upper surface of the left rocker arm 14L is supported by the left spring 15L. The contact point 14Lc on the upper surface of the other end of the left rocker arm 14L abuts against the left screw plug 16L. The left screw plug 16L biases the contact point 14Lc downward. The same applies to the right rocker arm 14R.

[0017] The left rocker arm 14L has a fulcrum 14Ld at a position of a distance A from a contact point 14La (acting point) that abuts against the lower surface 12a of the movable die 12, and a contact point 14Lc (force point) at a position of a distance B from the fulcrum 14Ld. Above the fulcrum 14Ld, it contacts a contact point 17Ld of the left side surface block 17L, and below the fulcrum 14Ld, it contacts a holding portion 10Ld of the base substrate 10, and the left rocker arm 14L is held pivotably about the fulcrum 14Ld. The left rocker arm 14L is rotatable about this fulcrum 14Ld, and based on the lever principle, the left screw plug 16L can support the impact load of the movable die 12 with a small force. That is, the return mechanism is configured to drive the lower part of the movable die 12 in the vertically upward direction.

[0018] The distance A and the distance B are in a ratio of distance A:distance B = 1:2. That is, the left rocker arm 14L has a force multiplying function so that the pressing force of the left screw plug 16L is doubled. Since the right rocker arm 14R has the same configuration, the impact load of the movable die 12 is supported by the left and right rocker arms 14L, 14R.

[0019] As described above, the movable die 12 is supported movably in the vertical direction by being supported by the left and right rocker arms 14L, 14R and the left and right springs 15L, 15R. And the return mechanism including the left and right rocker arms 14L, 14R has a high return speed, a long life, is hardly affected by heat, and has stability with respect to the conventional urethane repulsion. Also, it can receive a high impact load even in a narrow space, and has an advantage that the setting can be easily changed by changing the left and right springs 15L, 15R. According to the present invention, by having a return mechanism with a high return speed, a mold that can be processed with high efficiency can be provided.

[0020] (Regarding the holding mechanism) Referring to FIG. 3, on the upstream side of the fixed die 13 in the direction in which the material M flows, a final material guide 19, a regrinding liner 20, and a correction liner 21 are arranged. These constitute the members described later. correction Members. correction Further upstream of the component, a central block 22, a central material guide 23, a central block 24, and a central entrance guide 25 are arranged, and a holding mechanism (stripper) for holding material M is located in the central block 24.

[0021] Vibrations associated with cutting affect the feed operation and / or the quality of the cut surface, and these vibrations tend to be amplified further when the cycle is increased. In conventional technology, a vibration suppression mechanism is required near the jig, but this was not included. On the other hand, the present invention is equipped with a spring-pressure type strip mechanism (holding mechanism) consisting of an entrance holding member 26 and a screw plug 27. With this holding mechanism, it is possible to fix the material M at the moment of processing when the cycle is increased, thereby preventing vibration of the material M and enabling high-precision processing. Furthermore, the holding pressure can be changed simply by replacing the spring. According to the present invention, since cycle increases are possible by having a holding mechanism, it is possible to provide a mold that can process with high efficiency.

[0022] (Regarding modularization) The main components, the movable die 12, the punch 11, the fixed die 13, the return mechanism, and the holding mechanism, are all unitized within the mold. By unitizing the main components in this way, each unit can be changed, reducing the time spent stopping the equipment for setup, or so-called internal setup time, and consequently improving the equipment's operational efficiency.

[0023] In conventional technology, since the mold is not unitized, it is necessary to replace each individual component, requiring the machine to be stopped each time. On the other hand, according to the present invention, since the main components are unitized, it is possible to reduce the internal setup time and provide a mold that can be processed with high efficiency.

[0024] (How to adjust clearance) Next, a method for adjusting the clearance between the movable die 12 and the fixed die 13 in the direction of material M flow will be described. Figure 4 is a perspective view of the correction liner 21 (a spacer plate with high thickness accuracy). Note that the repolishing liner 20 has the same shape as the correction liner 21, so the drawing of the repolishing liner 20 is omitted. As described above, the final material guide 19, the repolishing liner 20, and the correction liner 21 (correction member) are arranged upstream of the fixed die 13. By replacing at least one of the liner members among the repolishing liner 20 and the correction liner 21, the clearance between the movable die 12 and the fixed die 13 in the flow direction, i.e., the axial direction, can be adjusted.

[0025] The common method for adjusting clearance involves pushing a screw in along the direction of material flow (M), pressing the back of the die to adjust the clearance between the dies. In conventional technology, clearance adjustment was performed by periodically grinding the dies. However, since grinding the dies changes their thickness, determining the amount of screw to push in (the correct amount) requires skill (by feel), and because the dies are an integrated part of the equipment, the adjustment work cannot be set up separately, resulting in a decrease in equipment utilization.

[0026] On the other hand, the correction liner 21 of the present invention has a hole 21a in the center, and its inner diameter is φ10 mm. The repolishing liner 20 is similar. The thickness t of the repolishing liner 20 is, for example, in increments of +1.20 mm from a standard thickness of 4.00 mm. The thickness t of the correction liner 21 is, for example, 3.98 to 4.05 mm, in increments of 5 μm. Since the repolishing of a total of four surfaces on the movable die 12 and the fixed die 13 is performed at a rate of 0.3 mm, the repolishing liner 20 is available in a lineup of 0.3 mm × 4 surfaces = 1.2 mm increments. The correction liner 21 is available in a lineup of 5 μm increments as a correction for the repolishing liner 20, and adjustments are made in 5 μm increments. By using these multiple liner members, precise clearance adjustment can be achieved.

[0027] According to the present invention, clearance adjustment can be performed simply by replacing designated liner members (regrinding liner 20, correction liner 21), and even inexperienced personnel can adjust the clearance once the dimensions are determined. Furthermore, since clearance adjustment can be performed during the external setup of the mold 1, equipment downtime is reduced. According to the present invention, since die clearance adjustment can be performed by replacing correction members, a mold that enables highly efficient processing can be provided.

[0028] (Regarding the discharge mechanism) Next, the discharge mechanism for the processed sprags will be described. Figure 5 is a cross-sectional view of the discharge guide 28 that constitutes the discharge mechanism. As described above, the discharge guide 28 is located downstream of the movable die 12. The discharge guide 28 is equipped with multiple air-blowing holes 28a, and in this embodiment, there are two of them. The sprags processed by the movable die 12 are efficiently discharged by compressed air injected from the multiple holes 28a. Furthermore, in order to discharge the sprags even more efficiently, the compressed air is injected at an angle to the direction in which the processed material M is discharged, and the injection direction from the multiple holes 28a converges to a single point. The compressed air injected in this way creates a negative pressure in region A, making it easier to discharge the sprags.

[0029] Because the processed sprags move laterally, in conventional technology they could accumulate and jam in the recess 12b of the movable die 12. In particular, sprag jamming was more likely to occur during high-speed cutting, which resulted in the need for sprag removal work and reduced the operating rate of the equipment.

[0030] On the other hand, according to the present invention, since the sprag processed by the movable die 12 is efficiently discharged, the equipment can be operated with high efficiency. According to the present invention, since the processed sprag is efficiently discharged, a mold that can process with high efficiency can be provided.

[0031] (Regarding the impact cut device) Conventional technology employed an impact mechanism with a sealed spring. After millions of drives (impacts), the spring would weaken or the washer would wear down and break, changing the spring constant. This necessitated periodic spring replacement. Furthermore, changing the impact load required changing the spring. Traditionally, replacing the spring was difficult because it was integrated into the equipment. Therefore, variations in equipment with different load capacities were offered.

[0032] On the other hand, the present invention allows the use of slides from a general-purpose high-speed press. Furthermore, no springs are used in the vertical mechanism, and maintenance is limited to that of the press machine. In addition, the springs incorporated into the die unit can be adjusted with any spring, and the stroke amount of the movable die 12 can be adjusted (by adjusting the punch tip length and die height). As a result, the stroke amount can be increased or the descent speed can be increased. According to the present invention, maintenance is easy and sprags can be processed efficiently, thus providing an impact cutting device that can process with high efficiency.

[0033] The impact cutting device 100 according to the present invention will now be described. Figure 6(A) is a schematic diagram of the impact cutting device 100 that drives the unitized mold 1. Figure 6(B) is a diagram showing the crank motion in terms of the crank angle α. Figure 7(A) is a diagram showing the relationship between the crank angle α and the press slide displacement / downward speed. Figure 7(B) is a diagram showing the relationship between the crank angle α and the press slide displacement / mold pressing load.

[0034] The impact cutting device 100 includes a motor-driven crankshaft 100b, a connecting rod 100c connected to the crankshaft 100b, a press slide 100a connected to the connecting rod 100c, and a base 100d. The connecting rod 100c converts the rotational motion of the motor into vertical motion through the eccentric motion of the crankshaft 100b, causing the press slide 100a connected to the connecting rod 100c to move up and down. A die 1 is placed on the base 100d, and the die 1 is positioned between the press slide 100a and the base 100d, and the sprag is processed by the vertical motion of the press slide 100a.

[0035] According to the crank motion shown in Figure 6(B), the maximum displacement of the press slide 100a is 25 mm. The top dead center in the figure is defined as crank angle α = 0°, and the bottom dead center is crank angle α = 180°. At a certain point, the rotational speed V of the crankshaft 100b can be decomposed into a vertical speed V1 and a horizontal speed V2.

[0036] Figure 7(A) is a diagram where the horizontal axis is the crank angle α°, and the vertical axis is the press slide displacement mm and the press slide descent speed m / sec. The press slide 100a has a maximum displacement of 25 mm, but actual sprag cutting is performed in the range of crank angle α from just before the press slide 100a reaches the bottom dead center to past the bottom dead center. During this cutting, the displacement of the press slide 100a is approximately 1 mm. In other words, the press slide 100a cuts the sprag without punching through the entire length of the material M being cut. By using a stroke with a small displacement, the feed time for the material M can be increased. In the diagram, the top dead center is at crank angles α = 0°, 360°, and 720°, and the bottom dead center is at crank angles α = 180° and 540°. The press slide 100a moves fastest when the crank angle α = 90°, 270°, 450°, etc.

[0037] Figure 7(B) is a diagram with the horizontal axis representing the crank angle α°, the vertical axis representing the press slide displacement mm, and the mold press load kgf. During sprag machining, the arm load on the arm member and the entrance retaining load on the entrance retaining member 26 are maximized. In other words, during sprag machining, loads are applied to the left and right rocker arms 14L and 14R that constitute the return mechanism, and to the entrance retaining member 26 and screw plug 27 that constitute the holding mechanism, indicating that each mechanism is operating.

[0038] Figure 8 is a schematic diagram of the configuration of an impact cutting device 100 equipped with two grippers. A timing belt 100e is connected to the crankshaft 100b, and the first and second grippers C1 and C2 are driven by this timing belt 100e. Normally, there is one first gripper C1 (feed gripper) and one fixed gripper (not shown), but by using two feed grippers, the first and second grippers C1 and C2, it is possible to increase the feed speed of the material M.

[0039] Conventional technology presents a challenge in increasing the feed rate of material M. The specifications of the material M feed device are determined by the mass of material M (plate thickness × plate width), the feed length, and the cycle time (cycles per minute). As the mass of material M increases, or as the feed length per unit time increases, the load on the feed device increases, requiring a stronger grip pressure from the feed gripper. On the other hand, increasing the grip pressure requires increasing the rigidity, which increases the mass of the moving body including the feed gripper (the grip and its surroundings). However, this increase in mass of the moving body including the feed gripper increases its inertial force, making it difficult to increase the moving speed.

[0040] Regarding the above problem, by providing two moving (feed) grippers (first and second grippers C1 and C2), the number of feeds per gripper is halved. This makes it possible to increase the moving speed while reducing the mass of the moving body including the grippers. According to the present invention, sprags can be processed efficiently by increasing the feed speed, so it is possible to provide an impact cutting device that can process with high efficiency. [Explanation of symbols]

[0041] 1. Mold 11 Punch (pressing member) 12 movable dice 13 Fixed Dice 20 Regrinding Liner (Correction Member, Liner Member) 21 Correction Liner (Correction Member, Liner Member) 100 Impact Cutting Device M Material

Claims

1. Movable dice and, A pressing member that transmits a force to drive the movable die vertically downward, A return mechanism having an arm member positioned vertically below the movable die for returning the movable die to a predetermined position, Fixed dice and, A mold comprising at least a holding mechanism for holding the material, which is positioned upstream of the fixed die in the direction in which the material to be processed flows, and which consists of a pressing member for holding the material and a spring for pressurizing the pressing member, The arm member is held so as to be pivotable, with one end of the arm member in contact with the lower surface of the movable die and the other end of the arm member in contact with the pressurizing member, thereby supporting the movable die. A mold characterized in that the movable die, the pressing member, the fixed die, the return mechanism, and the holding mechanism are unitized within the mold.

2. Movable dice and, A pressing member that transmits a force to drive the movable die vertically downward, A return mechanism having an arm member positioned vertically below the movable die for returning the movable die to a predetermined position, Fixed dice and, A mold comprising at least a holding mechanism for holding the material, which is positioned upstream of the fixed die in the direction in which the material to be processed flows, and which consists of a pressing member for holding the material and a spring for pressurizing the pressing member, The arm member is held so as to be pivotable, with one end of the arm member in contact with the lower surface of the movable die and the other end of the arm member in contact with the pressurizing member, thereby supporting the movable die. A mold characterized in that the pressing member drives the movable die vertically downward, and the arm member drives the lower part of the movable die vertically upward.

3. Movable dice and, A pressing member that transmits a force to drive the movable die vertically downward, A return mechanism having an arm member positioned vertically below the movable die for returning the movable die to a predetermined position, Fixed dice and, A mold comprising at least a holding mechanism for holding the material, which is positioned upstream of the fixed die in the direction in which the material to be processed flows, and which consists of a pressing member for holding the material and a spring for pressurizing the pressing member, The arm member is held so as to be pivotable, with one end of the arm member in contact with the lower surface of the movable die and the other end of the arm member in contact with the pressurizing member, thereby supporting the movable die. A mold characterized in that the clearance between the movable die and the fixed die can be adjusted by replacing at least one member that corrects the clearance.

4. Movable dice and, A pressing member that transmits a force to drive the movable die vertically downward, A return mechanism having an arm member positioned vertically below the movable die for returning the movable die to a predetermined position, Fixed dice and, A mold comprising at least a holding mechanism for holding the material, which is positioned upstream of the fixed die in the direction in which the material to be processed flows, and which consists of a pressing member for holding the material and a spring for pressurizing the pressing member, The arm member is held so as to be pivotable, with one end of the arm member in contact with the lower surface of the movable die and the other end of the arm member in contact with the pressurizing member, thereby supporting the movable die. A discharge mechanism for discharging the material processed by the movable die is further included downstream of the movable die, A mold characterized in that the discharge mechanism is configured to discharge the processed material by injecting compressed air.

5. The mold according to any one of claims 1, 2, or 4, characterized in that the clearance between the movable die and the fixed die can be adjusted by replacing at least one liner member located upstream of the fixed die.

6. The mold according to any one of claims 1 to 4, characterized in that the holding mechanism can change the pressure for holding the material to be processed by replacing the spring.

7. A discharge mechanism for discharging the material processed by the movable die is further included downstream of the movable die, The mold according to any one of claims 1 to 3, wherein the discharge mechanism discharges the processed material by injecting compressed air.

8. The mold according to claim 4, characterized in that the compressed air is injected obliquely with respect to the direction in which the processed material is discharged.

9. The mold according to any one of claims 1 to 4, characterized in that the arm members are arranged in pairs at the vertical lower part of the movable die.

10. Between one arm member and the other arm member, the arm member is held at the pivot point, The mold according to any one of claims 1 to 4, characterized in that the ratio of the distance from the contact point of the arm member that abuts the lower surface of the movable die to the pivot point and the distance from the contact point of the arm member that abuts the pressurizing member to the pivot point is 1:

2.

11. The mold according to any one of claims 1 to 4, characterized in that the pressing member applies an impact load to the movable die in the vertically downward direction.

12. A mold according to any one of claims 1 to 4, An impact cutting device characterized by having a press slide that applies an impact load to the pressing member.

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