Trimming device and trimming method

Abstract

A trimming apparatus and method are provided, capable of cutting off the useless portion of a molded article having a product portion and a useless portion in a single stamping stroke, and capable of correcting the strain of the product portion with high precision. The trimming apparatus includes: a lower die, having a mounting table for holding the product portion of the molded article, and a lower cutting edge movable in the vertical direction relative to the mounting table; an upper die, disposed on the upper part of the molded article, having an upper cutting edge corresponding to the lower cutting edge, and a pressing part extending downward; and a control unit for controlling the vertical movement of the upper die; after the useless portion is cut off by the upper and lower cutting edges, the control unit controls at least one of the upper die or the lower die to press the product portion downward by the pressing part.

Description

Technical Field

[0001] This invention relates to a trimming device and a trimming method. Background Technology

[0002] Previously, a strain correction device for a product has been proposed, which further includes a strain correction mechanism on a dressing die equipped with a dressing blade for cutting off useless parts of the casting (see Patent Document 1). The strain correction device of the product in Patent Document 1 can correct the strain of the part requiring surface accuracy of the casting in the first stage of stamping using the dressing die, and cut off the useless parts using the dressing blade in the second stage of stamping.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 8-164468 Summary of the Invention

[0006] [The problem the invention aims to solve]

[0007] However, after the strain correction device of the product in Patent Document 1 corrects the strain of the casting by means of the strain correction mechanism, it is necessary to use the trimming die set on the trimming stamping die to cut off the useless part around the flange. Therefore, it is difficult to correct the strain generated during the cutting and it is difficult to correct the strain of the product with high precision.

[0008] The present invention aims to provide a trimming device and trimming method that can cut off the useless part of a molded article having a product part and a useless part by a single stamping stroke, and can correct the strain of the product part with high precision.

[0009] [Technical means to solve the problem]

[0010] (1) A trimming device for cutting off the aforementioned useless portion of a molded article having a product portion and a useless portion, the trimming device comprising: a lower die having a mounting platform for holding the aforementioned product portion of the molded article and a lower cutting edge movable in a vertical direction relative to the aforementioned mounting platform; an upper die disposed on the upper part of the molded article having an upper cutting edge corresponding to the aforementioned lower cutting edge and a pressing portion extending downward; and a control unit for controlling the movement of the aforementioned upper die in a vertical direction; after the aforementioned useless portion of the molded article is cut off by the aforementioned upper cutting edge and the aforementioned lower cutting edge, the aforementioned control unit controls at least one of the aforementioned upper die or the aforementioned lower die to press the aforementioned product portion downward by the aforementioned pressing portion.

[0011] According to the trimming device in (1), since the upper die is equipped with an upper blade and a pressing part, after the useless part of the molded product is cut off by the upper and lower blades, the pressing part presses the product part downward, thereby correcting the strain of the product part. Therefore, by utilizing the single punching stroke of the upper die, it is possible to cut off the useless part of the molded product and correct the strain of the product part with high precision, thus enabling efficient construction.

[0012] (2) The trimming device according to (1) further includes a lower blade lifting mechanism, which follows the further downward movement of the upper mold after the aforementioned useless part is cut off, so that the aforementioned lower blade moves downward.

[0013] According to the dressing device in (2), since the lower cutting edge moves downward as the upper die moves further downward, the upper die can move downward smoothly without obstructing its downward movement. Therefore, by utilizing the single stamping stroke of the upper die, the cutting off of useless parts of the molded product and the correction of strain in the product section can be performed more reliably.

[0014] (3) According to the dressing device described in (1) or (2), the aforementioned lower cutting edge is supported by a plate, which is configured to be movable in the vertical direction by means of a cylinder.

[0015] According to the trimming device in (3), since the lower blade can move in the vertical direction by means of the plate and the cylinder, the cutting of the useless parts of the molded product and the correction of the strain of the product part can be performed more reliably by using the single stamping stroke of the upper die.

[0016] (4) According to the trimming device described in (3), the aforementioned upper mold also has a downwardly extending pressure pin, and the aforementioned plate is provided with a pressure pin receiving seat pressed by the aforementioned pressure pin.

[0017] According to the trimming device in (4), the vertical movement of the upper die and the lower cutting edge is controlled by the pressure pin and the pressure pin bearing seat, thereby stabilizing the vertical movement of the upper die and the lower cutting edge. Therefore, by utilizing a single stamping stroke, the single stamping stroke of the upper die can more stably cut off the useless parts of the molded product and correct the strain of the product part.

[0018] (5) According to the trimming device described in (3), the upper mold in the upper mold is also provided with a pressing pin that extends downward corresponding to the lower blade, and the pressing pin is configured to press the lower blade via the product part.

[0019] According to the dressing device in (5), the vertical movement of the upper die and the lower die is controlled by the pressure pin and the lower cutting edge, thereby stabilizing the vertical movement of the upper die and the lower die. Therefore, by utilizing the single stamping stroke of the upper die, the cutting off of useless parts of the molded product and the correction of strain of the product part can be performed more reliably.

[0020] (6) In any one of (1) to (3) the trimming device, the lower end of the aforementioned upper blade is located at a position lower than the lower end of the aforementioned pressing part.

[0021] According to the trimming device in (6), after the upper blade cuts off the useless part of the molded article, the product part of the molded article comes into contact with the pressing part. Therefore, by utilizing the single stamping stroke of the upper die, the cutting off of the useless part of the molded article and the correction of the strain of the product part can be performed more reliably.

[0022] (7) According to any one of (1) to (6), the upper mold further comprises: an upper blade support portion that supports the upper blade and is movable in the vertical direction; and a clamping portion that is movable independently of the upper blade support portion and is movable in the vertical direction; after the product portion is fixed by the clamping portion, the aforementioned useless portion of the molded article is cut off by the upper blade and the lower blade.

[0023] According to the dressing device in (7), the upper blade support and the clamping part can be moved independently in the vertical direction. Thus, by using the single stamping stroke of the upper die, the product part can be reliably fixed by the clamping part first, and then the upper blade can be moved to cut off the useless part. Furthermore, the cutting off of the useless part of the casting and the correction of the strain of the product part can be performed with higher precision.

[0024] (8) According to any one of (1) to (7) the trimming device, the lower mold further has a positioning part, the positioning part is provided on the mounting surface of the aforementioned mounting platform and the aforementioned product part is fixed on the upper part, the positioning part has a conical surface, the upper part of the conical surface is tapered on the surface that abuts against the lower end of the aforementioned product part; the aforementioned product part is fixed in the state of abutting against the aforementioned conical surface, and a gap is formed between the back part of the aforementioned product part and the upper surface of the aforementioned positioning part.

[0025] According to the trimming device in (8), since the product part of the molded article is fixed in a state of abutting against the conical surface of the positioning part, the position of the molded article placed on the mounting table can be stabilized. Therefore, the useless part of the molded article can be stably cut off at a predetermined position, and the strain of the product part of the molded article can be stably corrected at a predetermined position. Thus, by utilizing the single stamping stroke of the upper die, the cutting off of the useless part of the casting and the correction of the strain of the product part can be performed more reliably.

[0026] (9) According to the trimming device described in (8), at least two of the aforementioned positioning portions are provided along the extension direction of the aforementioned lower cutting edge, and the aforementioned conical surface is formed with a conical portion in a direction orthogonal to the aforementioned extension direction.

[0027] According to the dressing device in (9), since at least two positioning parts are provided in the extension direction of the lower cutting edge, the position of the molded part placed on the mounting table can be more stable. Therefore, by means of a single stamping stroke of the upper die, the cutting off of useless parts of the casting and the correction of strain of the product part can be performed more reliably.

[0028] (10) A trimming method, using a trimming device having an upper mold and a lower mold, cutting off the aforementioned useless portion of a molded article having a product portion and a useless portion, wherein the lower mold has a mounting platform for placing the product portion of the molded article and a lower cutting edge movable in the vertical direction relative to the mounting platform, and the upper mold is configured to be movable in the vertical direction relative to the mounting platform, having an upper cutting edge and a pressing portion extending downward, the trimming method comprising the following steps: setting the trimming device; placing the aforementioned product portion of the molded article on the mounting platform; moving the aforementioned lower cutting edge upward and moving the aforementioned upper mold downward, cutting off the aforementioned useless portion of the molded article by means of the shearing force generated by the aforementioned upper cutting edge and the aforementioned lower cutting edge; and moving the aforementioned upper mold further downward, pressing the aforementioned product portion downward by means of the aforementioned pressing portion.

[0029] According to the trimming method of the present invention (10), the useless parts of the molded part are cut off by the upper and lower cutting edges, and the product part is pressed downward by the pressing part after the useless parts are cut off. Therefore, the strain of the product part generated during casting and trimming can be corrected. Thus, by using the single stamping stroke of the upper die, the cutting off of the useless parts of the casting and the correction of the strain of the product part can be performed more reliably.

[0030] (The effect of the invention)

[0031] According to the present invention, a trimming device and trimming method can be provided, which can cut off the useless part of a molded article having a product part and a useless part by utilizing a single stamping stroke of the upper die, and can correct the strain of the product part. Attached Figure Description

[0032] Figure 1 This is a perspective view showing the configuration of the trimming device according to the first embodiment.

[0033] Figure 2A This is a schematic diagram showing the state of the molded article placed on the platform in the trimming apparatus of the first embodiment.

[0034] Figure 2B This is a schematic diagram showing the state in which the upper mold moves downward in the trimming device of the first embodiment.

[0035] Figure 2C This is a schematic diagram showing the state after the useless part has been removed by the upper and lower cutting edges in the trimming device of the first embodiment.

[0036] Figure 2D This is a schematic diagram showing the state in which the product part is pressed by the pressing part in the trimming device of the first embodiment.

[0037] Figure 3 This is a conceptual diagram illustrating the change of load within the device over time caused by the dressing method using the dressing device of the first embodiment.

[0038] Figure 4A This is a schematic diagram showing the state of the molded article placed on the platform in the trimming apparatus of the second embodiment.

[0039] Figure 4B This is a schematic diagram showing the state in which the useless part is removed by using the upper and lower cutting edges in the trimming device of the second embodiment.

[0040] Figure 4C This is a schematic diagram showing the state in which the product part is pressed by the pressing part in the trimming device of the second embodiment.

[0041] Figure 5A This is a schematic diagram showing the state of the molded article placed on the platform in the trimming apparatus of the third embodiment.

[0042] Figure 5B This is a schematic diagram showing the state in which the product clamping part fixes the product in the trimming device of the third embodiment.

[0043] Figure 5C This is a schematic diagram showing the state in which the useless part is removed by using the upper and lower cutting edges in the trimming device of the third embodiment.

[0044] Figure 5D This is a schematic diagram showing the state in which the product part is pressed by the pressing part in the trimming device of the second embodiment. Detailed Implementation

[0045] [First Implementation Method]

[0046] The first embodiment of the present invention will now be described in detail with reference to the accompanying drawings. The drawings show a schematic configuration of the trimming device of the present invention and do not depict the detailed shape of an actual device. Furthermore, four predetermined mutually orthogonal directions are designated as "Fr direction," "Rr direction," "R direction," and "L direction." "Fr direction" represents the front direction when viewing the trimming device from the front; "Rr direction" represents the rear direction when viewing the trimming device from the front; "R direction" represents the right direction when viewing the trimming device from the front; and "L direction" represents the left direction when viewing the trimming device from the front.

[0047] Figure 1This is an exploded perspective view showing the configuration of the trimming device 1 in this embodiment. The molded article 6 is, for example, formed by casting and solidified into the cavity shape of a mold provided in the casting apparatus. Therefore, the molded article 6 has a product portion 61 as the manufacturing objective, and useless portions 62, 62 formed by a gating portion that serves as a flow path for the molten material. The useless portions 62, 62 are areas that need to be cut off by the trimming device 1 during the product manufacturing process. Furthermore, in Figure 1 The movable part of the upper mold 3 and the plate 51 of the lower blade lifting mechanism 5 are shown in the middle with double dashed lines.

[0048] Product section 61 includes: an upper surface 611; three surrounding sides 612, 612, 612; a side opening 613 opening in the L direction; and a plurality of ribs 614. The upper surface 611 has a surface portion 611a and a back portion 611b. The upper surface 611 is a region where strain caused by compressive stress during casting or residual stress caused by temperature fluctuations during the cooling process after casting is likely to remain.

[0049] Rib 614 protrudes downward from the back portion 611b and has a lower end 614a. The lower end 614a of rib 614 is located above the lower end of side portion 612. Unused portions 62, 62 protrude from both ends of product portion 61 in the L and R directions. Thus, unused portions 62, 62 are supported by side portions 612, 612, 612 and placed on trimming device 1, forming a space below rib 614 protruding from the back portion 611b of product portion 61. However, the shape of product portion 61 is not limited to this. Product portion 61 may, for example, not have rib 614.

[0050] like Figure 1 As shown, the trimming device 1 includes: a lower mold 2 for holding the molded article 6; an upper mold 3 disposed on the upper part of the molded article 6 held on the lower mold 2; a control unit 4 for controlling the vertical movement of the upper mold; and a lower blade lifting mechanism 5. The lower mold 2 has a mounting platform 21 and a lower blade 22. The mounting platform 21 is a platform for holding the product part 61 of the molded article 6, and has a mounting surface 211 and a pair of positioning parts 23, 23.

[0051] The positioning part 23 protrudes from the mounting surface 211, and the product part 61 is mounted on its upper part. At least two positioning parts 23 are provided along the extending direction (Fr-Rr direction) of the lower cutting edge 22, and a tapered part 231 is formed in a direction orthogonal to the extending direction. The tapered part 231 has a pair of tapered surfaces 231a, 231a. The tapered surfaces 231a, 231a are formed with a tapered upper portion. Figure 2A As shown, the positioning part 23 is configured such that when the product part 61 is placed on the mounting surface 211, the lower ends 614a, 614a of a pair of ribs 614, 614 abut against the conical surfaces 231a, 231a.

[0052] The ribs 614, 614 of the product section 61 are fixed in a state of abutting against the conical surfaces 231a, 231a of the positioning section 23. When the product section 61 is placed on the mounting surface, by having the pair of ribs 614, 614 slidably abut against the conical surfaces 231a, 231a of the positioning section 23, the product section 61 can be positioned in the extending direction of the lower cutting edge 22.

[0053] In this embodiment, by providing two positioning portions 23 at intervals at the ends of the mounting surface 211 in the Fr and Rr directions, the product portion 61 can be positioned at two positions in the extending direction of the lower cutting edge 22. Therefore, the product portion 61 can be accurately positioned relative to the lower cutting edge 22, and the useless portion 62 can be cut off from the product portion 61 with high precision. At least two positioning portions 23 are sufficient, but multiple positioning portions 23 can also be provided on the mounting surface 211 depending on the shape of the molded product.

[0054] like Figure 1 As shown, the lower cutting edge 22 is configured to move vertically relative to the mounting platform 21 via the lower cutting edge lifting mechanism 5, which will be described later. The upper mold 3 has an upper cutting edge 31 corresponding to the lower cutting edge 22, a pressing part 32 extending downward, and a pressing pin 33 extending downward. The upper cutting edge 31 and the lower cutting edge 22 are a pair of corresponding block-shaped cutting edges, but the shape of the cutting edges, such as their thickness, can be set according to the shape of the molded product 6.

[0055] Using the shearing force generated by the downward movement of the upper blade 31 and the upward movement of the lower blade 22, the upper blade 31 and the lower blade 22 can cut off the useless part 62.

[0056] After the useless part 62 is cut off, as the upper mold 3 moves downward, the pressing part 32 moves downward, thereby pressing the front end of the pressing part 32 against the upper surface 611 of the product part 61 placed on the mounting platform 21. As described above, since a space is formed below the rib 614 provided in the product part 61, therefore, Figure 2D As shown, the central portion near the useless portion 62 on the upper surface 611 can be bent downwards by the pressing portion 32. By pressing with the pressing portion 32, the strain of the product portion 61 can be corrected. Therefore, even if the product portion 61 generates new strain when the useless portion 62 is cut off, the strain of the product portion 61 can be effectively corrected, so that the strain is less likely to remain in the product portion 61.

[0057] The pressing part 32 is composed of multiple pins. The diameter, number, spacing, and length of the pins extending downward from the upper mold of the pressing part 32 can be freely designed, for example, according to the shape of the product part 61 or the magnitude of the strain.

[0058] The pressure pin 33 is positioned opposite to the pressure pin bearing seat 53 of the lower blade lifting mechanism 5, which will be described later.

[0059] The lower blade lifting mechanism 5 includes a plate 51 and a cylinder 52. A pressure pin support 53 is provided on the upper surface of the plate 51. The lower blade 22 is supported by the plate 51. There are no particular limitations on the cylinder 52; for example, a gas spring, a hydraulic cylinder, or a pneumatic cylinder can be used. Multiple cylinders 52 can be provided.

[0060] As the pressure pin 33 moves downward following the upper die 3, the pressure pin support 53 is pressed down by the pressure pin 33. When the pressure pin support 53 is pressed down, the cylinder 52 is activated, thereby causing the plate 51 to descend. By causing the plate 51 to descend, the lower cutting edge 22 also descends.

[0061] In addition, Figure 1 In the middle, the pressing pin 33 and the pressing pin bearing seat 53 are set in cylindrical shape, and three of each are provided. However, there are no particular restrictions on the shape and number of the pressing pin 33 and the pressing pin bearing seat 53. For example, they can be set according to the shape of the product part 61 and other conditions.

[0062] The control unit 4 is configured to control the movement of the upper mold 3 in the vertical direction. By controlling the amount of movement of the upper mold 3 using the control unit 4, the pressure applied to the product part 61 by the pressing part 32 can be adjusted after the useless part 62 is cut off by the upper blade 31, and the strain of the product part 61 can be appropriately corrected.

[0063] Next, the finishing method of the molded article 6 using the finishing device 1 will be explained. Figure 2A This diagram shows the upper mold 3 beginning to descend. First, the product part 61 of the molded article 6 is placed on the positioning part 23 provided on the mounting surface 211 of the mounting table 21. At this time, by having the ribs 614, 614 of the product part 61 abut against the conical surfaces 231a, 231a of the positioning part 23, the product part 61 can be reliably positioned. The product part 61 is fixed on the mounting table 21 such that a gap C1 is formed between the back surface 611b of the product part 61 and the upper surface of the positioning part 23.

[0064] When the upper die 3 begins to descend, since the pressure pin 33 of the upper die 3 is physically separated from the pressure pin bearing seat 53 of the lower blade lifting mechanism 5, the load on the plate 51 is zero, and the telescopic part of the cylinder 52 maintains a height H1 (maximum value).

[0065] Figure 2B This diagram shows the initial trimming of the unused portion 62. When the upper mold 3 is moved downwards, the upper blade 31 abuts against the surface portion 611a of the product portion 61. At this time, since the pressure pin 33 has not yet abutted against the pressure pin support seat 53, the plate 51 is not under load, and the height of the telescopic portion of the cylinder 52 does not change. Furthermore, the pressing portion 32, like the pressure pin 33, does not abut against the surface portion 611a of the product portion 61, therefore, the product portion 61 is not under load.

[0066] Figure 2CThis diagram shows the state after the trimming of the useless part 62 is completed. The upper die 3 is moved further downwards, and the useless part 62 of the molded product 6 is cut off by the upper cutting edge 31 and lower cutting edge 22, which move downwards following the upper die 3. At this time, the upper die 3 bears the load used for the trimming process. Figure 2C As shown, by further lowering the upper mold 3, the telescopic portion of the cylinder 52 begins to shorten, and the pressing portion 32 can slightly abut against the surface portion 611a of the product portion 61.

[0067] Figure 2D This diagram illustrates the pressing part 32 pressing the product part 61. When the upper mold 3 is moved further downward, the pressing part 32 presses the surface part 611a of the product part 61 downward. At this time, the upper mold 3 bears the load for the pressing process. When the product part 61 is pressed downward, the upper surface 611 deforms, and the gap C1 between the back surface 611b of the upper surface 611 and the upper surface of the positioning part 23 narrows, changing to a gap C2. By pre-setting the gap C1 when placing the product part 61, the product part 61 can be deformed downward more easily.

[0068] By deforming the product section 61 downwards, the residual stress in the product section 61 can be released, thereby correcting the strain of the product section 61. Furthermore, since the residual stress in the useless section 62 is relatively large, the strain near the useless section 62 may also affect the strain of the product section 61. Therefore, it is desirable to correct the product section 61 after cutting off the useless section 62. The cylinder 52 is configured such that when the upper mold 3 moves downwards until the strain of the product section 61 is corrected, the extension portion of the cylinder 52 reaches its minimum value (H2).

[0069] Figure 3 This is a conceptual diagram illustrating the change in load within the device over time caused by the dressing method using the aforementioned dressing device 1. The cylinder load applied to cylinder 52 is set to a constant value and remains unchanged since the dressing device 1 is installed. At the start of upper die descent (2A), the upper die load applied to upper die 3 continuously increases, the upper cutting edge 31 comes into contact with the product section 61, and the transition occurs at the start of dressing (2B). Next, the useless section 62 is dressed using the upper cutting edge 31 and the lower cutting edge 22. The upper die load TL during the dressing of the useless section 62 is less than the cylinder load. Therefore, the cylinder 52 remains unchanged during dressing, and the position of the plate 51 that comes into contact with the cylinder 52 remains unchanged.

[0070] At the end of the finishing process (2C), by continuously lowering the upper mold 3, the load on the upper mold increases, and the pressing part 32 comes into contact with the surface part 611a of the product part 61. At this time, the upper mold load reaches the cylinder load, becoming the upper mold load SL, which is the same as the cylinder load. By further lowering the upper mold 3, the upper mold load increases, exceeding the upper mold load SL. As a result, the cylinder 52 begins to descend, and the pressing part 32 can begin to press the product part 61. During this pressing (2D), the upper mold load PL is greater than the upper mold load TL and the upper mold load SL.

[0071] If we represent the relationship between the maximum values ​​of each load, then the configuration is as follows: the upper die load TL during adjustment < the upper die load SL equal to the cylinder load < the upper die load PL during pressing. By making this configuration condition true, the adjustment method using the adjustment device 1 can simultaneously perform the adjustment of the useless part 62 and the strain correction of the product part 61 during a single stroke in which the upper die 3 moves downward.

[0072] According to the trimming device 1 of this embodiment, an upper cutting edge 31 and a pressing part 32 are arranged on the upper die 3. After the useless part 62 of the molded article 6 is cut off by the upper cutting edge 31 and the lower cutting edge 22, the pressing part 32 presses the product part 61 of the molded article 6 downward to correct the strain of the product part 61. Therefore, by utilizing a single stamping stroke of the upper die 3, the cutting off of the useless part 62 of the molded article 6 and the correction of the strain of the product part 61 can be performed efficiently.

[0073] The molded product 6 consists of a product section 61 and a useless section 62. However, the useless section 62 is prone to temperature fluctuations during the cooling process after casting, and residual stress is easily retained. Therefore, the greatest strain is easily generated in the useless section 62 and around the product section 61 adjacent to the useless section 62. According to the trimming device 1 of this embodiment, by first cutting off the useless section 62 where residual stress is easily retained, some of the residual stress remaining in the product section 61 is released, thereby reducing the strain of the product section 61. In addition, by moving the upper mold 3 downward, the lower cutting edge 22 is retracted from below the product section 61, thereby ensuring space to press the product section 61 and realizing strain correction of the product section 61.

[0074] [Second Implementation]

[0075] Next, refer to Figures 4A to 4C The second embodiment of the present invention will be described in detail below. For example... Figure 4A As shown, the dressing device 1B of the second embodiment differs from the dressing device 1 of the first embodiment in that a pressure pin 33B is arranged opposite the lower cutting edge 22 of the upper die 3B, and it does not have a pressure pin 33 and a pressure pin support seat 53. Other structures are the same as in the first embodiment, therefore the same symbols are used, and detailed descriptions are omitted.

[0076] The pressing pin 33B is disposed between the upper blade 31 and the pressing part 32, and the lower end of the pressing pin 33B is configured to be located higher than the lower end of the upper blade 31.

[0077] The following describes the dressing method using dressing device 1B. When the upper die 3B is moved downwards, the pressure pin 33B and the pressing part 32 move downwards together with the upper cutting edge 31. Then, as... Figure 4B As shown, the upper blade 31 and the lower blade 22 are used to cut off the useless part 62.

[0078] like Figure 4C As shown, if the upper mold 3B is moved further downward, when the pressing part 32 presses the product part 61, the pressing pin 33B presses the lower blade 22 via the product part 61. By pressing the lower blade 22, a cylinder load is applied to the cylinder 52 via the lower blade 22 and the plate 51. The cylinder load begins to increase when the pressing pin 33 and the pressing pin support 53 come into contact (2C). The cylinder load rises to the load (B) when the extension and retraction parts of the adjusting device 1 and the cylinder 52 in the first embodiment become the minimum value (H2) and the strain of the product part 61 is corrected (2D).

[0079] The trimming device 1B according to this embodiment is similar to the trimming device 1 of the first embodiment. An upper cutting edge 31 and a pressing part 32 are arranged on the upper die 3. After the useless portion 62 of the molded article 6 is cut off by the upper cutting edge 31 and the lower cutting edge 22, the pressing part 32 presses downward on the product portion 61 of the molded article 6 to correct the strain of the product portion 61. Therefore, by utilizing a single stamping stroke of the upper die 3, the cutting off of the useless portion 62 of the molded article 6 and the correction of the strain of the product portion 61 can be performed efficiently.

[0080] According to the dressing device 1B of this embodiment, since the lower cutting edge lifting mechanism 5 that moves the lower cutting edge 22 downward can be constructed in a simpler manner, the manufacturing of the dressing device 1B can be simplified. Furthermore, by eliminating the pressure pin receiving portion, a dressing device that can also be installed in a narrower position can be provided.

[0081] Furthermore, although the pressing pin 33B in this embodiment is positioned opposite to the lower cutting edge 22, the pressing pin of the present invention is not limited to this. As long as the pressing pin can press down the lower cutting edge 22 by means of the product part 61, the pressing pin can also be positioned at any position of the upper die 3B.

[0082] [Third Implementation Method]

[0083] Reference Figures 5A to 5D The third embodiment of the present invention will be described in detail below. For example... Figure 5AAs shown, the dressing device 1C of the third embodiment differs from the dressing device 1 of the first embodiment in that the upper die 3C has an upper blade support portion 311 and a clamping portion 7, and does not have a pressure pin 33 for pressing down the lower blade 22C. Other structures are the same as in the first embodiment, therefore the same symbols are used, and detailed descriptions are omitted.

[0084] like Figure 5A As shown, the upper mold 3C of the trimming device 1C has: an upper blade support 311 that supports the upper blade 31C and the pressing part 32C in a vertically movable manner; and a clamping part 7 that reliably fixes the product part 61 of the molded article 6. The upper blade support 311 and the clamping part 7 are configured to move in the vertical direction simultaneously with the upper mold 3C, following the movement of the upper mold 3B, and the upper blade support 311 and the clamping part 7 can be moved in the vertical direction separately.

[0085] The upper cutting edge 31C and the lower cutting edge 22C are arranged facing each other in an abutting manner. The length of the pressing part 32C is constant, and the lower end of the upper cutting edge 31C is located at a position lower than the lower end of the pressing part 32C. The clamping part 7 has a clamping plate 71 that abuts against and is fixed to the product part 61. In addition, in Figures 5A to 5D In the middle, the upper blade support part 311 is represented by dotted cross-sectional lines.

[0086] The lower blade lifting mechanism 5C includes a cylinder 52C and a support block 54. The lower blade 22C is supported on the support block 54 and is configured to move vertically, and is located in the lower part of the unused portion 62. The cylinder 52C is embedded in the mounting platform 21C. Since the structure of the cylinder 52C is the same as that of the cylinder 52 in the first embodiment, its description is omitted. The telescopic portion of the cylinder 52C maintains a height H3 when not under load.

[0087] The dressing method using dressing device 1C is explained. For example... Figure 5B As shown, the upper die 3B moves downwards, and the upper blade support 311 and the clamping part 7 also move downwards simultaneously. Since the lower end of the clamping plate 71 is located lower than the lower ends of the upper blade 31C and the pressing part 32C, the clamping part 7 can reliably fix the product part 61 of the molded article 6 first. As a result, the product part 61 is clamped by the lower blade 22C and the clamping plate 71 and cannot move.

[0088] Next, as Figure 5C As shown, with the product part 61 fixed in place by the clamping part 7, the upper blade support part 311 descends further independently, and the useless part 62 of the molded product 6 can be cut off by the shearing force generated by the upper blade 31C and the lower blade 22C.

[0089] Next, as Figure 5DAs shown, after cutting off the useless part 62, by further lowering the upper mold 3B, the support block 54 supporting the lower blade 22C also moves downward, and the cylinder 52C shortens to its maximum extent, keeping the extension part of the cylinder 52C at a height H4 below the height H3. At this time, by pressing the product part 61 with the pressing part 32C following the movement of the upper blade support part 311, strain correction can be performed.

[0090] According to the trimming device 1C of this embodiment, by further including the clamping part 7 in the trimming device 1 of the first embodiment, the useless part 62 can be cut off and strain corrected while the product part 61 is reliably fixed. As a result, the useless part 62 of the molded article 6 and the strain correction of the product part 61 can be performed with higher precision by means of a single stamping stroke of the upper die 3C.

[0091] While the preferred embodiments of the present invention have been described above, the present invention is not limited thereto. The present invention is not limited to the above embodiments, and appropriate modifications can be made within the scope of the present invention. For example, although the upper molds 3 and 3C are moved downwards in this embodiment, the upper molds 3 and 3C can also be moved downwards relative to the lower molds 2 and 2C by moving the lower molds 2 and 2C upwards relative to the upper molds 3 and 3C. Furthermore, the upper mold may also be equipped with a pressure pin.

[0092] Figure Labels

[0093] C1 gap

[0094] 1, 1B, 1C Dressing devices

[0095] 2 Lower mold

[0096] 3. 3C upper mold

[0097] 4. Control Department

[0098] 5.5C Lower blade lifting mechanism

[0099] 6 Molded products

[0100] 7. Clamping part

[0101] 21, 21C mounting stage

[0102] 22, 22C Lower cutting edge

[0103] 23 Positioning Department

[0104] 31, 31C Upper blade

[0105] 32, 32C Pressing Part

[0106] 33, 33B pressure pin

[0107] 51 boards

[0108] 52, 52C cylinders

[0109] 53 Pressure pin bearing seat

[0110] Product Department 61

[0111] 62 Useless Department

[0112] 211 Placement Surface

[0113] 231 Conical part

[0114] 231a, 231a conical surface

[0115] 311 Upper cutting edge support

[0116] 611b Back side

[0117] 614a lower end (lower end of product department)

Claims

1. A trimming device for cutting off the aforementioned useless portion of a molded article having a product portion and a useless portion, said trimming device comprising: The lower mold has a platform for placing the aforementioned product section of the molded article, and a lower cutting edge that can move in the vertical direction relative to the aforementioned platform. An upper mold, disposed on the upper part of the aforementioned molded article, has an upper cutting edge corresponding to the aforementioned lower cutting edge, and a pressing portion extending downward; and, The control unit controls the movement of at least one of the aforementioned upper mold or lower mold in the vertical direction; After the aforementioned useless part of the molded article is cut off by the aforementioned upper and lower cutting edges, the aforementioned control unit controls at least one of the aforementioned upper mold or the aforementioned lower mold to press the aforementioned product part downward by the aforementioned pressing unit.

2. The trimming device according to claim 1, wherein, It also has a lower blade lifting mechanism, which follows the downward movement of the upper mold after the aforementioned useless part is cut off, causing the aforementioned lower blade to move downward.

3. The trimming device according to claim 1 or 2, wherein, The aforementioned lower cutting edge is supported by a plate, which is configured to move vertically via a cylinder.

4. The trimming device according to claim 3, wherein, The aforementioned upper mold also has a downwardly extending pressure pin, and the aforementioned plate is provided with a pressure pin receiving seat that is pressed by the aforementioned pressure pin.

5. The trimming device according to claim 3, wherein, The aforementioned upper mold also has a pressing pin at the position above the aforementioned product part, corresponding to the aforementioned lower cutting edge extending downwards, and the aforementioned pressing pin is configured to press the aforementioned lower cutting edge via the aforementioned product part.

6. The trimming device according to claim 1 or 2, wherein, The lower end of the aforementioned upper blade is located further down than the lower end of the aforementioned pressing part.

7. The trimming device according to claim 1 or 2, wherein, The aforementioned upper die also includes: an upper cutting edge support portion that supports the aforementioned upper cutting edge and is movable in the vertical direction; and, The clamping part is configured to move independently of the aforementioned upper blade support part and can move in the vertical direction; After the aforementioned product part is fixed by the aforementioned clamping part, the aforementioned useless part of the aforementioned molded article is cut off by the aforementioned upper blade and the aforementioned lower blade.

8. The trimming device according to claim 1 or 2, wherein, The aforementioned lower mold also has a positioning part, which protrudes from the mounting surface of the aforementioned mounting platform, and the aforementioned product part is fixed on its upper part. The aforementioned positioning part has a conical surface, and the upper part of the conical surface is tapered on the surface that abuts against the lower end of the aforementioned product part; The aforementioned product part is fixed in the state of abutting against the aforementioned conical surface, and a gap is formed between the back part of the aforementioned product part and the upper surface of the aforementioned positioning part.

9. The trimming device according to claim 8, wherein, At least two of the aforementioned positioning parts are provided along the extension direction of the aforementioned lower cutting edge. The aforementioned conical surface has a conical portion formed in a direction orthogonal to the aforementioned extension direction.

10. A trimming method, using a trimming device having an upper mold and a lower mold, for cutting off the aforementioned useless portion of a molded article having a product portion and a useless portion. The aforementioned lower mold has a mounting platform for placing the product section of the aforementioned molded article, and a lower cutting edge that can move vertically relative to the aforementioned mounting platform. The aforementioned upper mold is configured to move vertically relative to the aforementioned mounting platform, and has an upper cutting edge and a downwardly extending pressing portion. The trimming method includes the following steps: The aforementioned trimming device is installed; The aforementioned product part of the aforementioned molded article is placed on the aforementioned mounting platform; The aforementioned lower cutting edge is moved upward, and the aforementioned upper mold is moved downward, using the shearing force generated by the aforementioned upper and lower cutting edges to cut off the aforementioned useless portion of the aforementioned molded article; and, The aforementioned upper mold is moved further downward, and the aforementioned pressing part is used to press the aforementioned product part downward.

Images