Bending machine for processing TO-3PH plastic package lead frame

Abstract

The utility model discloses a bending machine for processing a TO-3PH plastic package lead frame, which comprises a workbench, the top of the left side of the workbench is provided with a sliding chute, sliding blocks are symmetrically connected in the sliding chute in a sliding manner, and the top of each sliding block is integrally provided with a horizontal fixing plate; a telescopic rod is installed on the inner side of the top of the right side of the workbench, a bending plate is hinged to the top of the telescopic rod, and the bending plate is hinged to the right side of the top of the workbench; the horizontal fixing plate abuts against the side face of the lead frame through horizontal sliding. The side surface of the horizontal fixing plate is slidably connected with a vertical fixing plate, and the vertical fixing plate compresses the lead frame through vertical sliding. When the bending machine for processing the TO-3PH plastic package lead frame is used, the lead frame can be subjected to dual positioning and fixing in the horizontal direction and the vertical direction, so that the lead frame is prevented from deviating in appearance to influence the processing quality during bending, the problems that the back surface of a product is not fully filled and a fusion mark exists can be effectively avoided, and the product yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of TO-3PH plastic package lead frame processing, in particular to a bending machine for processing a TO-3PH plastic package lead frame. Background Art

[0002] The TO-3PH series of semiconductor back-end packaging often has the phenomenon of incomplete plastic resin filling and melt accumulation marks on the back due to the influence of plastic mold flow. Now, without any modification of the plastic mold, the mold flow trajectory is changed by bending the lead frame. The lead frame is bent before the back-end processing to achieve the requirement that the pin part on the lead frame and the heat sink part are bent into a certain angle. Most of the angles of manual bending will have errors, so it is necessary to use a corresponding bending machine for processing;

[0003] In a bending mechanism for a lead frame disclosed in publication number CN210614733U, a raw material lead frame is manually placed horizontally on the first clamping grooves of the left and right lower molds, and then the second driving cylinder drives the bending block to rise to the same horizontal plane of the lower mold, the clamping assembly is provided with two groups and symmetrically arranged, including an upper mold, a lower mold and a first driving cylinder, the upper mold is fixed on the frame, the lower mold is correspondingly arranged below the upper mold, and the lower mold is provided with a first clamping groove for placing the lead frame, that is, the first driving cylinder is connected to the lower mold and can drive the lower mold to approach the upper mold and clamp the lead frame, in order to facilitate the cooperation between the upper mold and the lower mold, the rotating motor drives the connecting rod to rotate upward and drives the mounting plate to flip upward around the connecting rod, and the mounting plate drives the bending block to rotate upward, thereby bending the raw material lead frame, at this time, the bending block is perpendicular to the lower mold, and the left and right bending blocks fold the lead frame into a "concave" shape, and the second driving cylinder drives the bending block to retreat to release the lead frame, and the finished product is taken out manually;

[0004] However, the above scheme still has the following problems during use: when performing the bending process, the lead frame is clamped by the upper and lower fixed mold bases, and then the lead frame is bent by rotating the mounting plate. The single clamping fixing method has weak stability, and the lead frame will be offset when it is bent, thereby affecting the bending effect. Therefore, the lead frame needs to be fully positioned and fixed, so as to effectively avoid the problems of incomplete filling and melt marks on the back of the product and improve product quality.

[0005] Therefore, we proposed a bending machine for TO-3PH plastic lead frame processing in order to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a bending machine for processing a TO-3PH plastic package lead frame, so as to solve the problem that the existing bending machines for processing a TO-3PH plastic package lead frame on the market, when performing a bending process, clamp the lead frame by upper and lower fixed mold bases, and then bend the lead frame by rotating a mounting plate, and the single clamping fixing method has weak stability, and the lead frame will deviate when it is bent, thereby affecting the effect of the bending process, and thus the lead frame needs to be fully positioned and fixed.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: A bending machine for processing a TO-3PH plastic lead frame, comprising a workbench, a slide groove is provided on the top of the left side of the workbench, a slide block is symmetrically slidably connected in the slide groove, and a horizontal fixing plate is integrally installed on the top of the slide block;

[0008] It also includes: a telescopic rod is installed on the inner side of the top of the right side of the workbench, and a bending plate is hinged on the top of the telescopic rod, and the bending plate is hingedly connected to the top right side of the workbench;

[0009] The horizontal fixing plate contacts the side surface of the lead frame by horizontal sliding;

[0010] The side surface of the horizontal fixing plate is slidably connected with a vertical fixing plate, and the vertical fixing plate presses the lead frame by vertically sliding.

[0011] Preferably, a rotating rod is connected through the left side of the workbench, and the outer sides of the front and rear sides of the rotating rod are connected to the first reciprocating screw rod through the first ratchet assembly, and the bearing of the first reciprocating screw rod is connected to the slide groove.

[0012] Preferably, the first reciprocating screw drives the horizontal fixing plate to slide horizontally through the slider, and the horizontal fixing plate is configured as an "L"-shaped structure.

[0013] Preferably, the front and rear ends of the rotating rod are connected to the telescopic rod through a sprocket mechanism, the outside of the telescopic rod is set to a circle, and the inside of the telescopic rod is set to a rectangular structure, and the telescopic rod bearing is connected to the front and rear sides of the top left side of the workbench.

[0014] Preferably, the end of the telescopic rod passes through the bearing and is connected to the inner side of the top of the horizontal fixed plate, and the end of the telescopic rod is connected to the vertical rod through a bevel gear connector, and the vertical rod bearing is connected to the middle inner side of the horizontal fixed plate, and the bottom outer side of the vertical rod is connected to the second reciprocating screw through a second ratchet assembly, and the second reciprocating screw bearing is connected to the vertical groove.

[0015] Preferably, the vertical groove is opened on the side of the horizontal fixing plate, and the second reciprocating screw is threadedly connected with a vertical fixing plate, and the vertical fixing plate forms a vertical clamping structure through the second reciprocating screw.

[0016] Preferably, the outer side of the vertical fixed plate is slidably connected to the groove, and the groove is symmetrically opened on the side of the horizontal fixed plate, and an air storage bag is installed in the groove, and the vertical fixed plate is in extrusion contact with the air storage bag, and at the same time, the outlet of the air storage bag is connected to the jet pipe installed on the top of the horizontal fixed plate.

[0017] Compared with the prior art, the bending machine for processing TO-3PH plastic lead frame of the utility model has the following beneficial effects: when in use, the lead frame can be fixed in both horizontal and vertical positions, so that the lead frame will not deviate from the shape when bent and affect the processing quality, thereby effectively avoiding the problem of incomplete filling and melt accumulation marks on the back of the product, improving the product yield, and being able to blow and remove impurities on the surface of the lead frame. The specific contents are as follows:

[0018] 1. By setting the first reciprocating screw and the horizontal fixing plate, the lead frame can be positioned horizontally during processing, and the "L"-shaped horizontal fixing plate can contact the side and bottom of the lead frame to maintain the stability of the contact. Compared with a single clamping, the limiting effect is better;

[0019] Furthermore, when the rotating rod rotates in the forward direction, it will drive the first reciprocating screw to rotate through the first ratchet assembly, and when the first reciprocating screw rotates, it will drive the slider to move in the slide slot, and when the slider moves, it will drive the top horizontal fixing plate to move synchronously, so that the spacing between the horizontal fixing plates on both sides can be adjusted according to the actual width of the lead frame;

[0020] 2. Through the arrangement of the telescopic rod and the second reciprocating screw rod, after the horizontal position is defined, the lead frame can be pressed by the vertical fixing plate, thereby positioning and fixing the vertical position, thereby improving the positioning stability;

[0021] Furthermore, after the rotating rod is reversed, the sprocket mechanism will drive the telescopic rod to rotate, and after the telescopic rod rotates, the vertical rod will be driven to rotate through the bevel gear connector, and after the vertical rod rotates, the second reciprocating screw rod will be driven to rotate through the second ratchet assembly, and after the second reciprocating screw rod rotates, the vertical fixing plate will be driven to move, thereby pressing the lead frame;

[0022] 3. By setting up the air storage bag and the air jet tube, air can be blown on the surface of the lead frame during the bending process to blow away dust or impurities and keep the process clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a schematic diagram of the overall front section structure of the utility model;

[0024] Figure 2 For this utility model Figure 1 The enlarged structural diagram at A in the middle;

[0025] Figure 3 For this utility model Figure 1 The enlarged structural diagram at B in the middle;

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the vertical fixing plate of the utility model;

[0027] Figure 5 This is a schematic diagram of the overall top view structure of the utility model;

[0028] Figure 6 For this utility model Figure 5 The enlarged structural diagram at C in the middle;

[0029] Figure 7 It is a side view structural schematic diagram of the connection between the horizontal fixing plate and the vertical fixing plate of the utility model.

[0030] In the figure: 1. workbench; 2. rotating rod; 3. first ratchet assembly; 4. first reciprocating screw rod; 5. slide groove; 6. slider; 7. horizontal fixing plate; 8. telescopic rod; 9. bending plate; 10. telescopic rod; 11. vertical rod; 12. second ratchet assembly; 13. second reciprocating screw rod; 14. vertical groove; 15. vertical fixing plate; 16. groove; 17. air storage bag; 18. jet pipe. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Embodiment 1: In order to solve the problem that the existing TO-3PH plastic lead frame bending machine is not firmly positioned during use, the following solution is proposed. For details, please refer to Figure 1-Figure 3 and Figure 5-Figure 7 As shown,

[0033] The workbench 1 includes a slide groove 5 on the top of the left side of the workbench 1, and a slider 6 is symmetrically slidably connected in the slide groove 5, and a horizontal fixing plate 7 is integrally installed on the top of the slider 6. The workbench 1 also includes: a telescopic rod 10 is installed on the inner side of the top of the right side of the workbench 1, and a bending plate 9 is hinged on the top of the telescopic rod 10, and the bending plate 9 is hingedly connected to the right side of the top of the workbench 1, and the horizontal fixing plate 7 contacts the side of the lead frame through horizontal sliding. During processing, the lead frame to be processed is placed on the workbench 1. After it is fixed, the telescopic rod 10 is extended, thereby driving the bending plate 9 to rotate. After the bending plate 9 rotates, the bending angle of the lead frame is adjusted, thereby effectively avoiding the problem of incomplete filling and melting marks on the back of the product, and improving the product yield;

[0034] Please refer to Figure 1-Figure 3 and Figure 5-Figure 7 As shown, a rotating rod 2 is connected through the left side of the workbench 1, and the outer sides of the front and rear sides of the rotating rod 2 are connected to the first reciprocating screw rod 4 through the first ratchet assembly 3, and the first reciprocating screw rod 4 is connected to the slide groove 5 by a bearing. The first reciprocating screw rod 4 drives the horizontal fixing plate 7 to slide horizontally through the slider 6, and the horizontal fixing plate 7 is set to an "L"-shaped structure. The front and rear ends of the rotating rod 2 are connected to the telescopic rod 10 through a sprocket mechanism, and the outer part of the telescopic rod 10 is set to a circular shape, and the inner part of the telescopic rod 10 is set to a rectangular structure, and the telescopic rod 10 is connected to the front and rear sides of the top of the left side of the workbench 1 by a bearing. The rotating rod 2 on the workbench 1 is rotated, and the rotating rod 2 will drive the first reciprocating screw rod 4 to rotate through the first ratchet assembly 3 after the rotating rod 2 rotates forward. After the first reciprocating screw rod 4 rotates, it drives the slider 6 to move in the slide groove 5. After the slider 6 moves, it will drive the top horizontal fixing plate 7 to move synchronously, thereby positioning and fixing the lead frame in a horizontal position, and contacting the bottom and side of the lead frame.

[0035] Embodiment 2: In order to improve the multiple restrictions on the lead frame and prevent the deviation during bending, the following solution is proposed. For details, please refer to Figure 1 and Figure 3-Figure 7 As shown,

[0036] The side of the horizontal fixing plate 7 is slidably connected with a vertical fixing plate 15, and the vertical fixing plate 15 compresses the lead frame by vertical sliding. The end of the telescopic rod 10 passes through the bearing and is connected to the top inner side of the horizontal fixing plate 7, and the end of the telescopic rod 10 is connected to the vertical rod 11 through a bevel gear connector, and the vertical rod 11 is connected to the middle of the inner side of the horizontal fixing plate 7 by a bearing, and the bottom outer side of the vertical rod 11 is connected to the second reciprocating screw rod 13 through a second ratchet assembly 12, and the second reciprocating screw rod 13 is connected to the vertical groove 14 by a bearing. The vertical groove 14 is opened on the side of the horizontal fixing plate 7, and the second reciprocating screw rod 1 3 is threadedly connected with a vertical fixing plate 15, and the vertical fixing plate 15 forms a vertical pressing structure through the second reciprocating screw rod 13. When the rotating rod 2 is reversed, the telescopic rod 10 will be driven to rotate synchronously through the sprocket mechanism. After the telescopic rod 10 rotates, the vertical rod 11 will be driven to rotate through the bevel gear connector. After the vertical rod 11 rotates, the second reciprocating screw rod 13 will be driven to rotate through the second ratchet assembly 12. After the second reciprocating screw rod 13 rotates, it will drive the vertical fixing plate 15 to slide in the vertical groove 14, so as to compress and fix the lead frame in the vertical position, thereby more comprehensively limiting and fixing the lead frame.

[0037] Embodiment 3: In order to keep the lead frame neat when being bent, the following solution is proposed. For details, please refer to Figure 1 , Figure 3 and Figure 5-Figure 7 As shown,

[0038] The outer side of the vertical fixing plate 15 is slidably connected to the groove 16, and the groove 16 is symmetrically opened on the side of the horizontal fixing plate 7, and an air bag 17 is installed in the groove 16, and the vertical fixing plate 15 is squeezed and contacted with the air bag 17, and at the same time, the outlet of the air bag 17 is connected to the injection pipe 18 installed on the top of the horizontal fixing plate 7. When the vertical fixing plate 15 slides, the air bag 17 in the groove 16 will be squeezed, and after the air bag 17 is pressurized, the internal gas will be transported to the injection pipe 18, and the injection pipe 18 will spray the gas to the surface of the lead frame, thereby keeping the lead frame clean.

[0039] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0040] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bending machine for processing a TO-3PH plastic lead frame, comprising a workbench (1), wherein a slide groove (5) is provided at the top of the left side of the workbench (1), and a slider (6) is symmetrically slidably connected in the slide groove (5), and a horizontal fixing plate (7) is integrally installed on the top of the slider (6); Features: Also includes: A telescopic rod (10) is installed on the inner side of the top of the right side of the workbench (1), and a bending plate (9) is hingedly connected to the top of the telescopic rod (10), and the bending plate (9) is hingedly connected to the top right side of the workbench (1); The horizontal fixing plate (7) contacts the side surface of the lead frame by horizontal sliding; The side surface of the horizontal fixing plate (7) is slidably connected to a vertical fixing plate (15), and the vertical fixing plate (15) presses the lead frame by vertically sliding.

2. A bending machine for processing a TO-3PH plastic lead frame according to claim 1, characterized in that: A rotating rod (2) is connected through the left side of the workbench (1), and the outer sides of the front and rear sides of the rotating rod (2) are connected to the first reciprocating screw rod (4) through a first ratchet assembly (3), and the bearing of the first reciprocating screw rod (4) is connected to the slide groove (5).

3. A bending machine for processing a TO-3PH plastic lead frame according to claim 2, characterized in that: The first reciprocating screw (4) drives the horizontal fixing plate (7) to slide horizontally via the slider (6), and the horizontal fixing plate (7) is configured as an "L"-shaped structure.

4. A bending machine for processing a TO-3PH plastic lead frame according to claim 2, characterized in that: The front and rear ends of the rotating rod (2) are connected to the telescopic rod (10) via a sprocket mechanism, the outside of the telescopic rod (10) is arranged in a circular shape, the inside of the telescopic rod (10) is arranged in a rectangular structure, and the bearing of the telescopic rod (10) is connected to the front and rear sides of the top of the left side of the workbench (1).

5. A bending machine for processing a TO-3PH plastic lead frame according to claim 4, characterized in that: The end of the telescopic rod (10) passes through a bearing and is connected to the inner side of the top of the horizontal fixed plate (7), and the end of the telescopic rod (10) is connected to the vertical rod (11) through a bevel gear connector, and the vertical rod (11) is connected to the middle part of the inner side of the horizontal fixed plate (7) through a bearing, and the outer side of the bottom of the vertical rod (11) is connected to the second reciprocating screw rod (13) through a second ratchet assembly (12), and the second reciprocating screw rod (13) is connected to the vertical groove (14) through a bearing.

6. A bending machine for processing a TO-3PH plastic lead frame according to claim 5, characterized in that: The vertical groove (14) is opened on the side of the horizontal fixing plate (7), and the second reciprocating screw (13) is threadedly connected with a vertical fixing plate (15), and the vertical fixing plate (15) forms a vertical clamping structure through the second reciprocating screw (13), and the second ratchet assembly (12) and the second ratchet assembly (12) have opposite rotation directions.

7. A bending machine for processing a TO-3PH plastic lead frame according to claim 6, characterized in that: The outer side of the vertical fixing plate (15) is slidably connected to the groove (16), and the groove (16) is symmetrically opened on the side of the horizontal fixing plate (7), and an air storage bag (17) is installed in the groove (16), and the vertical fixing plate (15) is in compression contact with the air storage bag (17), and at the same time, the outlet of the air storage bag (17) is connected to the injection pipe (18) installed on the top of the horizontal fixing plate (7).

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