JP2022110606A - Mold load distribution measuring device - Google Patents

Abstract

A mold load distribution measuring device is provided that does not require complicated adjustment of setting conditions for each processing machine even if it is attached to different processing machines.
A mold load distribution measuring device 10 has a load cell 20 having a detector 23 for detecting expansion and contraction of a strain-generating body in a steady state in which a load from a mold 50 attached to one side is not applied. A first plate 100 which receives the load from the mold 50 and which is provided in the load cell attachment portion in a state where the detection portion 23 detects the extension or compression and the first plate 100 is extended or compressed, and the first plate 100 and a second plate 200 provided on the other side, connected to the first plate 100, and attached to the mounting surface of the mold 50 of the press machine 1, which is a processing machine.
[Selection diagram] Fig. 1

Description

The present invention relates to an apparatus for measuring distribution of load applied to a mold.

Conventionally, there has been proposed an apparatus for measuring the load distribution of a mold by arranging a plurality of load cells. For example, in Patent Document 1, a plurality of load cells equipped with a detection unit that detects the expansion and contraction of a strain-generating body are expanded or compressed in a steady state in which no load is applied from a mold, and this expansion or compression is detected. Disclosed is a load distribution measuring device for a mold mounted on a plate in a state. The plate of this mold load distribution measuring device is directly attached to the mold mounting surface of the processing machine (for example, the lower surface of the slide in the press machine), or the plate is used as the die set plate or backing plate of the mold. can also

Japanese Patent No. 6370005

Here, the mounting surface of the mold in the processing machine, such as the lower surface of the slide of the press machine, is processed with T-grooves, bolt holes, etc. for mounting the mold. In addition, the mounting surface of the mold may be subjected to a large load due to the use of a processing machine, or scraps may be accidentally caught between the mounting surface of the mold and the upper die set plate, etc., resulting in unevenness. may be formed. When a plate provided with a load cell of a load distribution measuring device for a mold is attached to the mounting surface of such a mold, a space is formed between the plate and the mounting surface of the mold above the load cell. There is As a result, the plate of the load cell having the space above it deforms greatly, so that it may not be possible to measure a proper load. It is possible to adjust the settings of the load cell so that proper load measurement can be performed, but if the load distribution measuring device for molds is attached to another processing machine, it is necessary to adjust the settings again, which is complicated. .

On the other hand, when the load cell is provided on the backing plate of the mold or the like and the load cell is incorporated in the mold, the plate on which the load cell is provided is not directly attached to the mold mounting surface of the processing machine. Therefore, although no space is formed above the load cell, it is necessary to provide a mold load distribution measuring device for each of a large number of molds. Then, the mold load distribution measuring device remains attached to the mold even after measurement is no longer necessary, which is wasteful.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold load distribution measuring device that does not require complicated adjustment of setting conditions for each processing machine even if it is attached to different processing machines.

In the mold load distribution measuring device according to the present invention, a load cell having a detector for detecting expansion and contraction of a strain-generating body is expanded or compressed in a steady state in which no load is applied from a mold attached to one side of the load cell. and a first plate that receives the load from the mold and that is provided on the other side of the first plate, which is provided on the load cell mounting portion in a state in which the extension or compression is detected by the detection portion, and and a second plate connected to the first plate by a second plate attached to the mounting surface of the processing machine.

According to the present invention, it is possible to provide a mold load distribution measuring device that does not require complicated adjustment of setting conditions for each processing machine even if it is attached to different processing machines.

1 is a schematic front view of a principal part of a press machine to which a mold load distribution measuring device according to an embodiment of the present invention is attached; FIG. 1 is a schematic plan view of a mold load distribution measuring device according to an embodiment of the present invention, viewed from below; FIG. 3 is an enlarged schematic plan view of the Q2 portion of FIG. 2 in the mold load distribution measuring device according to the embodiment of the present invention. FIG. FIG. 4 is a schematic cross-sectional view taken along line IV-IV of FIG. 3 in the mold load distribution measuring device according to the embodiment of the present invention;

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic front view showing a state in which a die load distribution measuring device 10 is attached to a press machine 1 which is a working machine. The press machine 1 is a transfer press, and performs press working in a number of steps by sequentially conveying a blank material to a first process P1, a second process P2, . . . can be done. The mold load distribution measuring device 10 can be provided for each process (that is, for each mold 50).

The mold 50 has an upper mold 51 and a lower mold 52 . The upper die 51 has an upper die body 51a including a punch, a backing plate, a stripper plate and the like (not shown), and an upper die set plate 51b to which the upper die body 51a is attached. The upper die 51 (upper die set plate 51b) is attached to the slide 2 of the press machine 1 via the die load distribution measuring device 10 . On the other hand, the lower die 52 has a lower die main body 52a including a die and a die set plate (not shown) and a lower die set plate 52b to which the lower die main body 52a is attached. The lower die 52 (lower die set plate 52 b ) is attached to the bolster 4 fixed on the bed 3 of the press machine 1 .

FIG. 2 is a schematic plan view of the mold load distribution measuring device 10 as seen from below in FIG. The mold load distribution measuring device 10 has a first plate 100 and a second plate 200 . 2, the upper side in FIG. 2 is the front side of the press machine in FIG. The mold load distribution measuring device 10 is formed in a substantially long rectangular shape with the longitudinal direction of the press machine 1 aligned with the mold 50 . The mold load distribution measuring device 10 has three relay connectors 150 on the front side surface of the first plate 100 . The relay connector 150 is connected to a power supply wiring, a signal line, and the like to the detection unit 23 of the load cell 20, which will be described later. The first plate 100 is provided with grooves 151 of a predetermined length from the front, rear, left, and right side surfaces, which are used for positioning with the mold 50 . Suspension hooks 250 are fixed to the front side and the rear side of the second plate 200 . U-shaped slide mounting grooves 251 are formed in the second plate 200 between the hanging hooks 250 on the front side and the rear side. The second plate 200 (mold load distribution measuring device 10) is connected to the slide 2 of the press machine 1 by way of the slide mounting groove 251. not shown).

The first plate 100 is made of aluminum material. A lower surface 101, which is one surface of the first plate 100, is flat and contacts the upper surface of the upper die set plate 51b of the mold 50 (upper mold 51). On the upper surface 102 side, which is the other surface side of the first plate 100, a large number of concave portions 110 that are rectangular (regular rectangles or long rectangles) in plan view are formed (see also FIG. 4). The concave portions 110 are arranged in 12 rows and 8 columns. The upper surface 102 of the first plate 100 contacts the lower surface 201 of the second plate 200 which is formed in a flat surface.

A rib 113 is provided between adjacent concave portions 110 in the horizontal direction and the vertical direction. In other words, the space between the recesses 110 is formed like a rib. The upper surface of this rib 113 forms part of the upper surface 102 of the first plate 100 . A notch recess 114 is formed on the upper surface of the rib 113 so as to connect the adjacent recesses 110 . In other words, in the plan view of FIG. 2, the cutout recess 114 is formed so as to connect the sides of the rectangular recess 110 . The depth of the notch recess 114 may be such that the head of the load cell 20, which will be described later, does not protrude, and is formed shallower than the recess 110 (see FIG. 4).

A predetermined number of notch recesses 114 out of the plurality of notch recesses 114 are provided with female threaded portions 120 a and load cell attachment portions 120 to which load cells 20 described later can be attached. Here, the long hole 104 formed in the first plate 100 and the notch recess 114 in the recess 110 aligned vertically in FIG. Similarly, notch recess 114 near groove 151 is also formed at a position offset from the center of recess 110 .

Among the plurality of recesses 110, the recesses 110 that are adjacent to each other in the diagonal direction are notched recesses 115 that are recessed from the upper surface 102 so as to connect the rectangular tops of the recesses 110 in a plan view. is formed. The cutout recess 115 is also provided with a load cell mounting portion 120 formed with a female screw portion 120a to which the load cell 20 can be mounted.

In addition, from the tops of the recesses 110 at a plurality of locations, the rectangular tops of the recesses 110 in plan view are obliquely extended. A groove 116 is formed in the groove 102 . The concave groove 116 is also provided with a load cell mounting portion 120 formed with a female screw portion 120a to which the load cell 20 can be mounted.

Further, grooves 117 are formed to connect each relay connector 150 and the recess 110 near each relay connector 150 in the vertical direction in FIG. The recessed groove 117 is also formed with a female threaded portion 120 a near the recessed portion 110 to provide a load cell mounting portion 120 .

The top surface height h120 (see FIG. 4) of the load cell mounting portion 120 is set to be the same height for both the recesses 114 and 115 and the grooves 116 and 117. As shown in FIG.

Here, as shown in FIG. 4, the load cell 20 is provided with a detecting portion 23 (strain gauge in this embodiment) on the shaft portion 22 of the bolt 21 in this embodiment. Therefore, in the load cell 20, the shaft-shaped shaft portion 22 is the strain generating body. The load cell 20 is screwed into a female screw portion 120a formed in the load cell mounting portion 120 and set. In this manner, the load cell 20 extends the shaft portion in a steady state of no load (that is, a state in which the load distribution measuring device 10 for a mold does not receive a load from the mold 50), and this extension is detected by the detector 23, the load cell mounting portion 120 is provided.

Wiring for power supply and wiring for signals pass through the notch recesses 114 and 115 and the grooves 116 and 117 as appropriate.

Moreover, the load cell 20 can be of various forms, for example, it can be a load cell having a nut compressed by a bolt as a strain-generating body, and the detection unit 23 is not only a strain gauge but also a piezo element or the like. can be a detection unit using various sensor elements. According to the load cell 20 attached in this manner, not only the portion where the first plate 100 receives a compressive load but also, for example, the vicinity of the edge of the die 50 (upper die set plate 51b) receives a tensile load. In some cases, the compressive load and tensile load generated in the mold 50 can be detected with high accuracy.

On the other hand, the second plate 200 made of steel has a flat bottom surface 201 and a top surface 202 . The bottom surface 201 of the second plate 200 abuts the top surface 102 of the first plate 100 . The upper surface 202 of the second plate 200 abuts the lower surface 2b (mold mounting surface) of the slide 2. As shown in FIG. The connection between the first plate 100 and the second plate 200 is achieved by four fastening portions 18a provided on each side in the longitudinal direction and two fastening portions 18b arranged in the center. The fastening portions 18a and 18b are formed in the first plate 100 with holes having countersunk portions through which fastening bolts (not shown) are inserted. A fastening bolt inserted through the hole is screwed into a female threaded portion 205 formed in the second plate 200 corresponding to the hole.

On the other hand, as shown in FIG. 4, the mold 50 and the mold load distribution measuring device 10 are fixed to the four long holes 104 (see also FIG. 2) formed in the first plate 100. A bolt 55 for fastening is inserted from the lower surface side of the upper die set plate 51b of the die 50. As shown in FIG. The bolt 55 is screwed into six female threaded portions 210 formed in the second plate 200 corresponding to the long holes 104 . Thus, the mold 50 (upper mold 51) is fastened to the second plate 200 with the first plate 100 interposed therebetween.

Here, the first plate 100 is formed thicker than the second plate 200 . Further, as shown in the enlarged view of part Q1 in FIG. 1, the plate thickness T200 of the second plate 200 is thicker than the nominal dimension A of the T groove 2a of the slide 2 of the press machine 1 to which the second plate 200 is attached. formed (T200>A).

According to the mold load distribution measuring device 10 formed in this way, the upper surface 102 of the first plate 100 and the lower surface 201 of the second plate 200 are in contact with each other, so that the mounting state of the load cell 20 (upper space) ) does not change. Therefore, even if the mold load distribution measuring device 10 is attached to a different press machine, the state of the lower surface 2b of the slide 2 (that is, the state in which unevenness is formed or the arrangement of the T-groove is different for each press machine) ), the load distribution can be measured without adjusting the load cell 20 of the mold load distribution measuring apparatus 10 for each press machine.

One or more plates may be provided between the first plate 100 and the second plate 200 . That is, the mold load distribution measuring device 10 includes a first plate 100 having a mold 50 attached to one surface (lower surface 101) and a load cell 20 attached thereto, and the other surface (upper surface 101) of the first plate 100. 102) side and attached to the mounting surface of the press machine 1 (the lower surface 2b of the slide 2). In other words, the second plate 200 may be in direct contact with the upper surface 102 of the first plate 100 as in this embodiment, or may be connected to the first plate 100 via a member such as another plate. You may have

Further, in the first plate 100, ribs 113 are formed between the concave portions 110 adjacent to each other in the horizontal or vertical direction. A load cell mounting portion 120 is provided on the rib 113 . The upper surface of the rib 113 is used as the upper surface 102 of the first plate 100 and is in contact with the lower surface 201 of the second plate 200 . As a result, even if the load cell 20 is positioned outside the load transmission range from the load point of the mold 50 , the load is transmitted from the load point of the mold 50 to the ribs 113 . Therefore, even if the load cell 20 is located outside the load transmission range, the load can be detected, and the load distribution can be measured with higher accuracy.

Also, if the thickness of the second plate 200 is thin, the second plate 200 may be deformed particularly at the T-groove 2a of the slide 2 . Therefore, the plate thickness of the second plate 200 is formed thicker than the nominal dimension A of the T-groove 2a in this embodiment.

Also, the first plate 100 and the second plate 200 are fixed to each other by screw fastening at the fastening portions 18a and 18b. The fastening portion 18 a is provided on the edge side of the first plate 100 and the second plate 200 . The fastening portion 18 b is provided between the load cells 20 . For example, focusing on the fastening portion 18b on the upper side of FIG. , between the load cell 20-4 and the load cell 20-5 in the horizontal direction. In other words, one or more screws of the fastening portion 18b are provided within the area of the die 50 (within the range of the two-dot chain line indicating the upper die set plate 51b in FIG. 2). As a result, the upper surface 102 of the first plate 100 and the lower surface 101 of the second plate 200 can always be kept in contact with each other.

Also, the first plate 100 is made of aluminum, and the second plate 200 is made of steel. As a result, the weight of the mold load distribution measuring device 10 can be reduced, and the influence on the upper mold suspension capability of the slide 2 of the press machine 1 can be reduced. The second plate 200 having high hardness and the mold 50 can be fastened with the bolts 55 so as to be sandwiched between the die set plate 51b and the second plate 200 .

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments and can be implemented with various modifications. For example, the mold load distribution measuring device 10 attaches the first plate 100 to the lower die set plate 52 b of the lower die 52 , attaches the second plate 200 to the bolster 4 , and applies the load from the lower die 52 . may be measured. Further, although the processing machine is the press machine 1 in the present embodiment, it is not limited to this, and for example, the mold load distribution measuring device 10 may be attached to an injection molding machine.

REFERENCE SIGNS LIST 1 press machine 2 slide 2a T groove 2b lower surface 3 bed 4 bolster 10 mold load distribution measuring device 18a fastening portion 18b fastening portion 20 load cell 21 bolt 22 shaft portion 23 detection portion 50 mold 51 upper mold 51a upper mold main body 51b top Mold die set plate 52 Lower mold 52a Lower mold main body 52b Lower mold die set plate 55 Bolt 100 First plate 101 Lower surface 102 Upper surface 104 Long hole 110 Recess 113 Rib 114 Cut recess 115 Cut recess 116 Groove 117 Groove 120 Load cell mounting portion 120a Female screw portion 150 Relay connector 151 Groove 200 Second plate 201 Lower surface 202 Upper surface 205 Female screw portion 210 Female screw portion 250 Hanging hook 251 Slide mounting groove

Claims (5)

A load cell equipped with a detector for detecting expansion and contraction of a strain-generating body expands or compresses in a steady state in which no load is applied from a mold attached to one side, and this expansion or compression is detected by the detector. a first plate that receives the load from the mold and is provided at the load cell mounting portion in a state where the load cell is mounted;
a second plate provided on the other side of the first plate, connected to the first plate, and attached to a mounting surface of a processing machine;
A load distribution measuring device for a mold, characterized by comprising: 2. A mold load distribution measuring device according to claim 1, wherein the plate thickness of said second plate is thicker than the nominal dimension of the T-groove of said processing machine to which said second plate is attached. the first plate and the second plate are fixed to each other by screws;
3. The mold load distribution measuring device according to claim 1, wherein one or more screws are provided between a plurality of the load cells. the first plate and the second plate are fixed to each other by screws;
4. The mold load distribution measuring device according to claim 1, wherein one or more screws are provided in a mold area of the mold. The first plate is made of an aluminum material,
5. A mold load distribution measuring device according to claim 1, wherein said second plate is made of steel.

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