Press equipment

Abstract

To provide a press equipment in which wear of a movable-side die set and wear of a movable die caused by the contact of them can be prevented.SOLUTION: A workpiece W undergoes press-working by press equipment which comprises: a fixed base 10; a movable base 11 provided to be movable back and forth with respect to the fixed base 10; and metallic mold structure 12 provided between the fixed base 10 and the movable base 11. The metallic mold structure 12 comprises a fixed-side die set 21 fixed to the fixed base 10, and a movable-side die set 22 which is fixed to the movable base 11 and constitutes a die set 20 together with the fixed-side die set 21. Further, the metallic mold structure 12 comprises a fixed mold 30 fixed to the fixed-side die set 21, a movable mold 40 provided between the fixed mold 30 and the movable-side die set 22, and a first energizing member 50 provided between the movable mold 40 and the fixed mold 30. The movable mold 40 is provided to be accessible to and separable from the movable-side die set 22. The first energizing member 50 energizes the movable mold 40 toward the movable-side die set 22.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a press apparatus. [Background technology]

[0002] Patent Document 1 describes a press working device that presses a workpiece. The press processing device described in Patent Document 1 includes a fixed base, a movable base that is movable in the vertical direction above the fixed base, and a die structure disposed between the fixed base and the movable base. The die structure includes a lower die fixed to the upper surface of the fixed base, an upper die located above the lower die, a first elastic body provided between the lower die and the upper die, and a pressure adjusting device connected to the upper surface of the upper die.

[0003] The first elastic body is provided between the lower die and the upper die, and biases the upper die toward the movable table. The pressure adjustment device has a pressure plate facing the movable table. The movable table is configured to separate from the pressure plate at the top dead center of the movable table, and to be able to come into contact with the pressure plate by moving downward from the top dead center. When the upper die is pressed downward by the movable table via the pressure plate, the first elastic body itself contracts, causing the upper die and the lower die to approach each other. When the upper die and the lower die approach each other further, the upper die and the lower die work together to press the workpiece.

[0004] In the press processing device described in Patent Document 1, the movable table and the pressure adjustment device are provided so as to be movable toward and away from each other. Therefore, the only component that is reciprocated by the drive device is the movable table. This reduces the mass of the component that is reciprocated by the drive device, so that the movable table can be reciprocated at high speed.

[0005] In general, members constituting the mold structure, such as the lower mold and the upper mold, are made of a material harder than the movable base and the fixed base. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2022 / 030571 Summary of the Invention [Problem to be solved by the invention]

[0007] In the press processing device of Patent Document 1, the pressure plate constitutes the die structure. Therefore, it can be said that the pressure plate is formed of a material harder than the movable table, which does not constitute the die structure. Also, in the press processing device of Patent Document 1, as described above, the pressure plate and the movable table are configured to be movable toward and away from each other. Therefore, when the movable table moves downward, it comes into contact with the pressure plate, which is harder than the movable table, and this causes a problem that the movable table becomes easily worn. [Means for solving the problem]

[0008] The press apparatus for solving the above problem is a press apparatus for press processing a workpiece, and includes a fixed table, a movable table that is movable toward and away from the fixed table, and a mold structure that is provided between the fixed table and the movable table, and the mold structure includes a fixed side die set fixed to the fixed table, a movable side die set that is fixed to the movable table and forms a die set together with the fixed side die set, a fixed mold fixed to the fixed side die set, a movable mold that is provided between the fixed mold and the movable side die set and is capable of moving toward and away from the movable side die set, and a biasing member that is provided between the movable mold and the fixed mold or the fixed side die set and biases the movable mold toward the movable side die set.

[0009] According to this configuration, the movable die set is fixed to the movable table, and the movable mold is provided so as to be movable toward and away from the movable die set, so that when the movable table moves toward the fixed mold, the movable mold is pressed by the movable die set and moves toward the fixed mold, and the workpiece is pressed by the fixed mold.

[0010] Here, the mass of the structure reciprocated by the drive unit is smaller than that of a structure in which the movable die is fixed to the movable die set, i.e., a structure in which the movable table, the movable die set, and the movable die move together as a unit, allowing the movable table and the movable die set to reciprocate at high speed.

[0011] The movable die is arranged to be movable toward and away from the movable die set, and is biased toward the movable die set by a biasing member. Therefore, when the movable platform and the movable die set retreat from the fixed die and move away from the movable die, the biasing force of the biasing member causes the movable die to move away from the fixed die. This makes it possible to remove a workpiece from between the fixed die and the movable die, or to transport a workpiece between the fixed die and the movable die.

[0012] The movable die set and the movable mold are made of a material having a higher hardness than the movable base, which does not constitute the mold structure. Furthermore, the difference in hardness between the materials constituting the movable die set and the movable mold is negligibly small compared to the difference in hardness between the materials constituting the movable die set and the movable base. Therefore, wear due to contact between the movable die set and the movable mold is unlikely to occur. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view of a pressing device according to one embodiment. [Diagram 2] FIG. 2 is an enlarged cross-sectional view showing the die structure of FIG. [Diagram 3] FIG. 3 is a cross-sectional view showing a state in which the movable die set is in contact with the movable mold. [Figure 4] FIG. 4 is a cross-sectional view showing a state in which the movable mold is closer to the fixed mold than in the state shown in FIG. [Diagram 5] FIG. 5 is a cross-sectional view showing a state in which the workpiece is clamped between the stripper plate and the fixed die. [Figure 6]FIG. 6 is a cross-sectional view showing a state in which the workpiece is being pressed by the punch. [Figure 7] FIG. 7 is a cross-sectional view showing a first modified example of the pressing device. [Figure 8] FIG. 8 is a cross-sectional view showing a second modified example of the pressing device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, one embodiment of a press device will be described with reference to FIGS. The press machine of this embodiment is a press machine for punching out iron core pieces of a motor core, for example.

[0015] As shown in FIG. 1, the press apparatus is an apparatus for pressing a workpiece W, and includes a fixed table 10, a movable table 11 that is movable toward and away from the fixed table 10, and a die structure 12 that is provided between the fixed table 10 and the movable table 11.

[0016] <Fixed stand 10, movable stand 11> The fixed base 10 is fixed onto a fixed surface (not shown). The movable base 11 is disposed above the fixed base 10 and is configured to be movable up and down by a driving force applied from a driving device (not shown).

[0017] The fixed base 10 and the movable base 11 are made of, for example, cast iron. <Mold structure 12> Next, the mold structure 12 will be described in detail.

[0018] As shown in FIGS. 1 and 2, the mold structure 12 includes a die set 20, a fixed mold 30, a movable mold 40, a first biasing member 50, a second biasing member 44, and a guide mechanism 60. (Die Set 20) As shown in FIG. 1, the die set 20 includes a fixed die set 21 and a movable die set 22.

[0019] The fixed-side die set 21 has a generally rectangular plate shape, and is fixed to the upper surface of the fixed base 10 via clamps 13. First holes 21a are formed in the upper surface of each of the four corners of the fixed-side die set 21. Note that two of the four first holes 21a are shown in FIG.

[0020] A guide bush 25 is press-fitted into the first hole 21a. A biasing member 29 is disposed inside the guide bush 25. The biasing member 29 is, for example, a coil spring. A ball retainer 26 is accommodated inside the guide bush 25. The ball retainer 26 includes a cylindrical holder 26a and a number of balls 26b that are supported so as to be able to roll in a number of holes formed in the peripheral wall of the holder 26a. The lower end of the holder 26a is supported by the biasing member 29. The ball retainer 26 is configured to be able to move up and down relative to the guide bush 25 as the balls 26b roll on the inner peripheral surface of the guide bush 25.

[0021] The movable die set 22 is fixed to the lower surface of the movable table 11 via a clamp 14. The movable die set 22 has four through holes 27 that penetrate the movable die set 22 in the up-down direction at positions corresponding to the four first holes 21a, respectively.

[0022] The through hole 27 has a reduced diameter portion 27a that opens to the lower surface of the movable die set 22, and an increased diameter portion 27b that opens to the upper surface of the movable die set 22 and has a larger diameter than the reduced diameter portion 27a.

[0023] The guide post 24 is inserted into the through hole 27 from above. The guide post 24 has a post body 24a that is inserted into the reduced diameter portion 27a, and an enlarged diameter portion 24b that is larger in diameter than the post body 24a and is inserted into the enlarged diameter portion 27b.

[0024] The expanded diameter portion 24 b is located at the upper end of the guide post 24 and is in contact with the lower surface of the movable table 11 . The lower end of the post body 24a is inserted into the ball retainer 26 and is biased upward by a biasing member 29.

[0025] The guide bush 25 and the ball retainer 26 guide the reciprocating movement of the guide post 24 in the up and down direction, that is, the vertical movement of the movable die set 22 relative to the fixed die set 21 .

[0026] (Fixed type 30) As shown in FIG. 2, the fixed mold 30 includes a die plate 31 and a die 32 . The die plate 31 has a substantially rectangular plate shape, and is fixed to the upper surface of the fixed die set 21 .

[0027] A first through hole 31a that passes through the die plate 31 in the vertical direction is provided in the center of the die plate 31. A die 32 having a die hole 33 is press-fitted into the first through hole 31a.

[0028] Second through holes 31b that penetrate the die plate 31 in the up-down direction are provided at the four corners of the die plate 31. Note that, in Fig. 2, two of the four second through holes 31b are shown.

[0029] A second hole 21b is provided at a position corresponding to the second through hole 31b in the upper surface of the fixed die set 21. The second hole 21b is provided on the same axis as the second through hole 31b.

[0030] A fixed guide bush 65 is press-fitted into the second hole 21b and the second through hole 31b. A biasing member 69 is disposed inside the fixed-side guide bush 65. The biasing member 69 is, for example, a coil spring. A fixed-side ball retainer 66 is accommodated inside the fixed-side guide bush 65. The fixed-side ball retainer 66 has a cylindrical holder 66a and a number of balls 66b that are supported so as to be able to roll by a number of holes formed in the peripheral wall of the holder 66a. The lower end of the holder 66a is supported by the biasing member 69. The fixed-side ball retainer 66 is configured to be able to move up and down relative to the fixed-side guide bush 65 by the balls 66b rolling on the inner peripheral surface of the fixed-side guide bush 65.

[0031] The lower ends of a plurality of (e.g., four) first biasing members 50 are fixed to the periphery of the die 32 on the upper surface of the fixed mold 30. The first biasing members 50 are, for example, coil springs. The plurality of first biasing members 50 are disposed at equal intervals in the circumferential direction about a virtual axis (not shown) that passes through the center of the die 32 and extends in the vertical direction.

[0032] (Movable type 40) As shown in FIG. 2, the movable die 40 includes a stripper plate 43, a punch plate 41, and a punch .

[0033] The stripper plate 43 is in the shape of a substantially rectangular plate. The lower surface of the stripper plate 43 is supported by the upper ends of a plurality of first biasing members 50. That is, the first biasing members 50 are provided between the stripper plate 43 and the fixed die 30, and bias the stripper plate 43, i.e., the movable die 40, toward the movable-side die set 22.

[0034] A first through hole 43a that passes through the stripper plate 43 in the vertical direction is provided in the center of the stripper plate 43. The first through hole 43a is provided at a position corresponding to the die hole 33.

[0035] Four second through holes 43b are provided at the four corners of the stripper plate 43, penetrating the stripper plate 43 in the up-down direction. In FIG. 2, two of the four second through holes 43b are shown. The four second through holes 43b are provided at positions corresponding to the four second through holes 31b of the die plate 31. A middle portion of a cylindrical guide post 64 extending in the up-down direction is press-fitted into the second through hole 43b. The guide post 64 protrudes upward from the upper surface of the stripper plate 43 and protrudes downward from the lower surface of the stripper plate 43. The lower end of the guide post 64 is inserted into the fixed ball retainer 66. The lower end of the guide post 64 and the fixed ball retainer 66 are biased upward by a biasing member 69.

[0036] The lower ends of a plurality of second biasing members 44 are fixed to the periphery of the first through-hole 43a on the upper surface of the stripper plate 43. The second biasing members 44 are, for example, coil springs. The second biasing members 44 are disposed at equal intervals in the circumferential direction centered on a virtual axis (not shown) that passes through the center of the first through-hole 43a and extends in the up-down direction.

[0037] The spring constant of the second biasing member 44 is set to be greater than the spring constant of the first biasing member 50 . The punch plate 41 is in the shape of a substantially rectangular plate. The entire upper surface of the punch plate 41 is flat and perpendicular to the vertical direction, and is configured to be movable toward and away from the movable die set 22. That is, the movable die 40 is provided between the fixed die 30 and the movable die set 22, and is provided to be movable toward and away from the movable die set 22. The lower surface of the punch plate 41 is supported by the upper ends of a plurality of second biasing members 44. That is, the second biasing members 44 are provided between the punch plate 41 and the stripper plate 43, and bias the punch plate 41 and the stripper plate 43 so as to move them away from each other in the vertical direction.

[0038] An attachment hole 41a is provided in the center of the lower surface of the punch plate 41. A base end of a punch 42 extending in the vertical direction is fitted and attached in the attachment hole 41a. The tip end of the punch 42 is inserted into the first through hole 43a and configured to be able to penetrate the stripper plate 43. The tip end of the punch 42 is located inside the first through hole 43a when the movable die set 22 and the punch plate 41 are not in contact with each other.

[0039] At the four corners of the punch plate 41, through holes 41b are provided which penetrate the punch plate 41 in the up-down direction. Note that two of the four through holes 41b are shown in Fig. 2. The four through holes 41b are provided on the same axis as the four second through holes 31b of the die plate 31, respectively.

[0040] A movable guide bush 61 is press-fitted into the through hole 41b. A movable ball retainer 62 is housed inside the movable guide bush 61. The movable ball retainer 62 has a cylindrical holder 62a and a number of balls 62b that are rollably supported by a number of holes formed in the peripheral wall of the holder 62a.

[0041] The upper end of the guide post 64 is inserted into the interior of the movable ball retainer 62 . The guide mechanism 60 is configured by the above-mentioned fixed side guide bush 65, fixed side ball retainer 66, movable side guide bush 61, movable side ball retainer 62, guide post 64, and biasing member 69. The guide mechanism 60 guides the movement of the movable die 40 in the forward and backward directions relative to the fixed side die set 21, i.e., along the vertical direction.

[0042] The die plate 31, the die 32, the stripper plate 43, the punch plate 41, and the punch 42 constituting the die structure 12 are, for example, made of rolled steel. The hardness of the material constituting the die structure 12 is higher than the hardness of the material constituting the fixed base 10 and the movable base 11.

[0043] As indicated by the two-dot chain lines in FIGS. 1 and 2, the press device is configured so that the workpiece W is transported onto the die 32 through spaces between the first biasing members 50. Next, the operation of the press device will be described with reference to FIGS.

[0044] 1 and 2, when the movable table 11 is at the top dead center, the movable die set 22 is separated from the punch plate 41. In this state, the movable die 40 is urged by the first urging member 50, causing the movable die 40 to retreat from the fixed die 30. Therefore, as shown by the two-dot chain line in FIGS. 1 and 2, the workpiece W is removed from between the fixed die 30 and the stripper plate 43, and the workpiece W is transported between the fixed die 30 and the stripper plate 43.

[0045] 3, when the movable table 11 and the movable die set 22 descend, first, the lower surface of the movable die set 22 comes into contact with the upper surface of the punch plate 41. At this time, the urging member 29 is pressed downward by the guide post 24, and the urging member 29 is compressed. This allows the movable table 11 and the movable die set 22 to approach the fixed die 30.

[0046] Next, as shown in Fig. 4 and Fig. 5 in order, when the movable table 11 and the movable die set 22 further descend, the first urging member 50 is pressed downward via the movable die set 22, the punch plate 41, the second urging member 44, and the stripper plate 43. The spring constant of the first urging member 50 is smaller than the spring constant of the second urging member 44. Therefore, the first urging member 50 is compressed in preference to the second urging member 44. At this time, the urging member 69 is pressed downward by the movable die set 22 via the guide post 64, so that the urging member 69 is compressed. As a result, the stripper plate 43 descends, and the workpiece W is sandwiched between the stripper plate 43 and the die plate 31.

[0047] At this time, the punch plate 41 and the stripper plate 43 are biased by the second biasing member 44 so as to move away from each other, so that the tip of the punch 42 is positioned inside the first through-hole 43a.

[0048] 6, when the movable table 11 and the movable die set 22 are further lowered, the second biasing member 44 is compressed. As a result, the stripper plate 43 and the punch plate 41 approach each other, causing the tip of the punch 42 to protrude from the stripper plate 43. As a result, the workpiece W is pressed by the punch 42 and the die 32.

[0049] Next, the operation of this embodiment will be described. In the press machine of this embodiment, the movable die set 22 is fixed to the movable table 11, while the movable mold 40 is provided so as to be movable toward and away from the movable die set 22. Therefore, the mass of the structure reciprocated by the drive device is smaller than that of a structure in which the movable mold is fixed to the movable die set, i.e., a structure in which the movable table, the movable die set, and the movable mold move integrally. This allows the movable table 11 and the movable die set 22 to reciprocate at high speed.

[0050] The movable die set 22 and the movable mold 40 constitute the mold structure 12 and are therefore made of a material having a higher hardness than the movable base 11, which does not constitute the mold structure 12. Moreover, the difference in hardness between the materials constituting the movable die set 22 and the movable mold 40 is negligibly small compared to the difference in hardness between the materials constituting the movable die set 22 and the movable base 11.

[0051] Next, the effects of this embodiment will be described. (1) The movable die 40 is provided between the fixed die 30 and the movable die set 22 and is capable of moving toward and away from the movable die set 22. The first biasing member 50 is provided between the movable die 40 and the fixed die 30 and biases the movable die 40 toward the movable die set 22.

[0052] With this configuration, the above-mentioned effects are achieved, so that wear caused by contact between the movable die set 22 and the movable die 40 is unlikely to occur. (2) The guide mechanism 60 is provided between the movable die 40 and the fixed die set 21 and guides the displacement of the movable die 40 in the up-down direction relative to the fixed die set 21 .

[0053] If the movable die 40 is provided so as to be movable toward and away from the movable die set 22, there is a risk that the position of the movable die 40 may shift relative to the movable die set 22 in the orthogonal direction that is perpendicular to the up-down direction.

[0054] In this regard, according to the above-mentioned configuration, the relative displacement of the movable die 40 in the up-down direction with respect to the fixed die set 21 is guided by the guide mechanism 60. As a result, while the movable die 40 is provided so as to be able to approach and separate from the movable die set 22, it is possible to suppress the positional deviation of the movable die 40 with respect to the movable die set 22 in the orthogonal direction.

[0055] (3) The first biasing member 50 is provided between the stripper plate 43 and the fixed die 30. The second biasing member 44 is disposed between the punch plate 41 and the stripper plate 43 and biases the punch plate 41 and the stripper plate 43 so as to separate them from each other in the up-down direction.

[0056] According to this configuration, when the movable table 11 and the movable die set 22 are retracted from the fixed die 30, the stripper plate 43 is lifted by the first biasing member 50. In addition, after the workpiece W is clamped between the stripper plate 43 and the fixed die 30, the tip of the punch 42 can be protruded from the lower surface of the stripper plate 43. This makes it possible to improve the accuracy of the press working.

[0057] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

[0058] The number of the first holes 21a of the fixed die set 21 is not limited to four, and may be five or more. The number of through holes 41b of the punch plate 41 is not limited to four and may be five or more. In this case, it is sufficient that the die plate 31 has second through holes 31b at positions corresponding to the through holes 41b.

[0059] The stripper plate 43 may be omitted. In this case, the second biasing member 44 may be omitted, and the first biasing member 50 may be provided between the fixed die 30 and the punch plate 41.

[0060] The guide mechanism 60 may be omitted. In this embodiment, the first biasing member 50 is provided between the fixed die 30 and the stripper plate 43, but the present invention is not limited to this.

[0061] For example, as shown in FIG. 7, a first biasing member 150 may be provided between the fixed die set 121 and the stripper plate 143. Furthermore, as shown in FIG. 8, a first biasing member 250 may be provided between the fixed die set 221 and the punch plate 241. [Explanation of symbols]

[0062] 10…Fixed stand 11…Movable base 12…Mold structure 13,14…Clamp 20…Die set 21, 121, 221...Fixed side die set 21a…1st hole 21b…Second hole 22… Movable die set 24…Guidepost 24a…Post body 24b…Enlarged diameter part 25...Guide bush 26...Ball cage 26a...Holding body 26b…Ball 27...Through hole 27a...Reduced diameter part 27b…Enlarged diameter part 29... Urging member 30…Fixed type 31…Die plate 31a...1st through hole 31b...Second through hole 32…Die 33…Die hole 40…Movable type 41,241…Punch plate 41a…Mounting hole 41b...Through hole 42...Punch 43,143…Stripper plate 43a...1st through hole 43b…Second through hole 44...Second biasing member 50, 150, 250...First biasing member 60...Guide mechanism 61... Movable guide bush 62...Movable ball retainer 62a...Holding body 62b...Ball 64…Guidepost 65...Fixed side guide bush 66...Fixed ball retainer 66a...Holding body 66b…Ball 69... Urging member W…Work

Claims

1. A press device for press processing a workpiece, A fixed stand and A movable base that is movable toward and away from the fixed base; A mold structure is provided between the fixed table and the movable table, The mold structure includes: A fixed die set fixed to the fixed base; a movable die set fixed to the movable table and constituting a die set together with the fixed die set; A fixed die fixed to the fixed die set; a movable die provided between the fixed die and the movable die set and movable relative to the movable die set; and a biasing member provided between the movable die and the fixed die or the fixed die set, for biasing the movable die toward the movable die set. Press equipment.

2. When the direction of movement of the movable table relative to the fixed table is defined as the moving direction, a guide mechanism provided between the movable die and the fixed die set for guiding displacement of the movable die in the advancing / retreating direction relative to the fixed die set; The press device according to claim 1 .

3. When the direction of movement of the movable table relative to the fixed table is defined as the moving direction, The movable mold is a punch plate; and a stripper plate provided between the punch plate and the fixed die and configured to clamp the workpiece with the fixed die, a punch configured to be capable of penetrating the stripper plate is fixed to the punch plate, When the biasing member is a first biasing member, the first biasing member is provided between the stripper plate and the fixed die or the fixed side die set, a second biasing member is provided between the punch plate and the stripper plate to bias the punch plate and the stripper plate so as to move them away from each other in the advance / retract direction; The press device according to claim 1 or 2.

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