Automatic punching machine for injection molding water gap

Abstract

The utility model discloses an automatic punching machine for an injection molding water gap, and belongs to the technical field of post-processing equipment for injection molding parts. In order to overcome the defects that burrs are easily generated during cold cutting of TPU materials, the positioning precision is low and potential safety hazards exist in operation, a thermal-mechanical coupling shearing scheme is provided, specifically, a temperature control heating device and a cutter plated with a diamond-like coating work cooperatively, and plastic cutting is completed after a water gap is heated to be in a viscoelastic state; + / -0.1 mm precision positioning is realized through a profiling groove positioning structure and a spring pre-pressing buffer mechanism, and the movement precision is ensured by combining double-cylinder linkage driving; the equipment is integrated with an infrared safety sensing module and a double-hand operation interlocking device, and meets the industrial safety standard. After the device is applied, the burr height of the nozzle is less than or equal to 0.02 mm, the single-piece treatment efficiency is improved by 50%, the manual finishing requirement is thoroughly eliminated, and the device is suitable for automatic nozzle treatment of high-elasticity materials such as TPU soles.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding piece post-processing equipment field, especially injection molding water gap automatic punching machine. BACKGROUND

[0002] In TPU (thermoplastic polyurethane) shoe sole injection molding process, the removal of water gap (pouring gate residual material) is the key process affecting product quality. The traditional technology has the following problems:

[0003] 1. Material characteristics limit: TPU material has high elasticity and viscoelasticity, cold cutting at room temperature easily leads to material rebound, producing burr (burr height generally > 0.1mm), which needs secondary manual finishing, increasing more than 30% of working hour cost; 2. Poor process matching: the existing equipment mostly adopts general punching die, which cannot adapt to the water gap shape diversity (such as curved surface, multi-angle water gap) of TPU injection molding piece, positioning error > ±0.5mm, leading to less than 85% of product qualification rate; Lack of heat management: lack of precise temperature control cutting system, TPU is prone to stick to the cutter at glass transition temperature (about 50-80℃) interval, and the continuous working life of the cutter is less than 100,000 times; Safety hazard: manual operation easily causes industrial accidents, and industry statistics show that the injury rate of water gap processing process accounts for 22% of injection molding workshop. CONTENT OF THE UTILITY MODEL

[0004] The utility model solves the technical problem of overcoming the defects of the prior art and provides an injection molding water gap automatic punching machine.

[0005] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0006] The utility model discloses an injection molding water gap automatic punching machine, which comprises:

[0007] A workbench;

[0008] A lifting mechanism is fixed on the workbench and comprises: a lifting cylinder arranged vertically, the cylinder body of which is fixed on the workbench; two parallel guide columns, which are fixed vertically on the workbench and located on the two sides of the lifting cylinder; a lifting plate, which is connected slidingly on the guide column and fixedly connected with the piston rod of the lifting cylinder;

[0009] An upper die mechanism is fixed below the lifting plate and comprises: a cutter fixing plate rigidly connected with the lifting plate; a cutting knife and a heating rod fixed on the cutter fixing plate; a pre-pressing plate elastically connected with the lifting plate through a pre-pressing spring, and the pre-pressing plate is located below the cutter fixing plate; an upper die plate fixed on the bottom of the pre-pressing plate;

[0010] A pushing mechanism comprises: a guide rail arranged horizontally and fixed on the surface of the workbench; a push plate connected slidingly on the guide rail; a drive cylinder fixed on the side surface of the workbench, and the piston rod of the drive cylinder is connected with the push plate;

[0011] Lower die mechanism, fixed on the push plate, comprising a lower die plate for positioning the injection molded part;

[0012] Stroke adjustment mechanism, comprising an adjustment bolt fixed on the workbench and a stroke limiting block fixed on the bottom of the lifting plate, the lifting stroke is controlled by the contact position of the adjustment bolt and the stroke limiting block.

[0013] As a preferred technical scheme of the utility model, the advancing mechanism further comprises cylinder limiting blocks symmetrically arranged on both sides of the push plate, and the piston rod end of the driving cylinder is hinged to the push plate through a floating joint.

[0014] As a preferred technical scheme of the utility model, the cutting blade has a diamond-like coating on the cutting edge surface, the thickness of the coating is 2-5 microns, and the hardness is greater than or equal to 3000 HV.

[0015] As a preferred technical scheme of the utility model, the heating rod is internally provided with a PID temperature control module, the working temperature range is 50-100 DEG C, and the PID temperature control module is connected with a temperature sensor signal; the compression stroke of the pre-pressing spring is adjustable, and the pre-pressing force range is 5-20 N.

[0016] As a preferred technical scheme of the utility model, the lower die plate is provided with a profiling groove matched with the shape of the cutting blade, and the depth of the profiling groove is 3-5 mm.

[0017] As a preferred technical scheme of the utility model, a linear bearing is arranged between the guide column and the lifting plate, the inner ring of the linear bearing is in clearance fit with the guide column, and the clearance amount is 0.02-0.05 mm.

[0018] As a preferred technical scheme of the utility model, infrared sensing devices are arranged on both sides of the workbench, the detection area of the infrared sensing devices covers the movement path of the lifting mechanism, and the infrared sensing devices are interlocked with the control circuit of the lifting cylinder; a double-hand trigger type safety switch is further arranged on the workbench, and the safety switch is connected in series in the driving circuit of the lifting cylinder.

[0019] Compared with the prior art, the utility model has the beneficial effects as follows:

[0020] 1. Through the cooperation of the heating rod and the pre-pressing spring, the TPU water gap can complete plastic deformation in the viscoelastic state, the burr height is reduced to less than or equal to 0.02 mm, and secondary processing is avoided; the PID temperature control module realizes an accuracy of ±0.5 DEG C, and TPU overheating carbonization or cooling hardening is avoided.

[0021] 2. The 3-5 mm profiling groove of the lower die plate is matched with the shape of the cutting blade, and can be compatible with more than eight special-shaped water gaps in combination with the floating joint hinge structure, the positioning accuracy is improved to ±0.1 mm; the diamond-like coating cutter makes the TPU cutting surface roughness Ra less than or equal to 1.6 microns;

[0022] 3, infrared sensing device covers 200mmx200mm area, response time ≤30ms, realize the motion part emergency stop protection; double hand trigger switch and cylinder interlock, meet ISO 13849 PLd level safety standards, injury risk is reduced by 90%. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and are used to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0024] Figure 1 is the overall structure schematic diagram of the present application;

[0025] Figure 2 is the front view of the present application;

[0026] Figure 3 is the top view of the present application;

[0027] Figure 4 is the side view of the present application;

[0028] In the drawings: 1, workbench; 2, lifting mechanism; 3, advancing mechanism; 4, upper die mechanism; 5, lower die mechanism; 6, stroke adjusting mechanism; 7, infrared sensing device; 8, safety switch; 21, lifting cylinder; 22, guide column; 23, lifting plate; 31, push plate; 32, guide rail; 33, driving cylinder; 34, cylinder limiting block; 41, cutter fixing plate; 42, cutter; 43, heating rod; 44, temperature sensor; 45, pre-pressing plate; 46, pre-pressing spring; 47, upper die plate; 51, lower die plate; 61, adjusting bolt; 62, stroke limiting block. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present application will be described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to explain and illustrate the present application, and do not constitute a limitation on the present application.

[0030] The same reference numerals in the drawings all refer to the same parts.

[0031] As shown in Figures 1-4 , the present application provides an automatic punching machine for injection molding water gap, comprising the following main body structure:

[0032] The workbench 1 adopts 6061 aluminum alloy plate, and the surface is calibrated by level gauge, and the flatness error is ≤0.05mm / m².

[0033] The lifting mechanism 2 comprises: a lifting cylinder 21, the cylinder body is fixed on the upper surface of the workbench 1 through bolts, the piston rod stroke is 200mm, and the output thrust is 800N; guide columns 22, two chromium-plated steel columns with a diameter of 30mm are vertically installed on the two sides of the lifting cylinder 21, and the height is 500mm; a lifting plate 23 is made of 6061 aluminum alloy and is slidably connected with the guide columns 22 through linear bearings, the inner ring of the linear bearing is in clearance fit with the guide columns 22, and the clearance is 0.03mm.

[0034] The upper die mechanism 4 comprises: a tool fixing plate 41, which is rigidly connected with the lifting plate 23 through four groups of M12 bolts and is made of SKD11 die steel; a cutter 42, the cutting edge of which is coated with 3um diamond-like coating, the hardness is 3200HV, and the cutting edge angle is 60°±0.5°; a heating rod 43, which is a ceramic heating pipe with a diameter of 8mm, is internally provided with a PID temperature control module, the power is 500W, and the temperature control precision is ±0.5℃; a pre-pressing plate 45, which is elastically connected with the lifting plate 23 through four groups of pre-pressing springs 46, the spring stiffness coefficient is 5N / mm, and the compression stroke is adjustable in the range of 10-30mm; and an upper die plate 47, which is provided with a polytetrafluoroethylene heat insulation layer at the bottom and is connected with the pre-pressing plate 45 through a dovetail groove structure.

[0035] The advancing mechanism 3 comprises: guide rails 32, two parallel arranged ball linear guides, which are installed on the surface of the workbench 1 and have a length of 800mm; a push plate 31, which is slidably connected with the guide rails 32 through a sliding block and has a repeated positioning precision of ±0.02mm; a driving cylinder 33, the cylinder body of which is fixed on the side surface of the workbench 1, the piston rod is hinged with the push plate 31 through a floating joint, and the maximum advancing speed is 200mm / s; and cylinder limiting blocks 34, which are symmetrically arranged on the two sides of the push plate 31 and are made of polyurethane buffer pads, the impact noise is less than or equal to 65dB.

[0036] The lower die mechanism 5 comprises a lower die plate 51, the surface of which is processed with a profiling groove with a depth of 4mm, and the material is S136 corrosion-resistant steel.

[0037] The stroke adjusting mechanism 6 comprises: an adjusting bolt 61, an M10 fine thread bolt with a lead of 0.5mm; and a stroke limiting block 62, a 45# steel block subjected to quenching treatment, and a copper-based wear-resistant gasket is embedded on the contact surface of the adjusting bolt 61.

[0038] The use mode of the utility model is as follows:

[0039] 1, initial state: the lifting cylinder 21 is in the upper limiting position, and the push plate 31 retreats to the end of the guide rail;

[0040] 2, workpiece loading: the TPU injection molded part is placed on the lower die plate 51, and positioning and constraint are completed;

[0041] 3, temperature control: the heating rod 43 is started, the temperature is set to 75℃ (for TPU material), and the PID module is automatically adjusted to ±0.5℃ fluctuation.

[0042] 4. Advancing positioning: the driving cylinder 33 pushes the push plate 31 to move along the guide rail 32 until the lower mold plate 51 reaches the cutting station, and the cylinder limiting block 34 triggers the stop signal;

[0043] 5. Pre-pressing stage: the lifting cylinder 21 drives the lifting plate 23 to descend, and the pre-pressing spring 46 first contacts the workpiece and applies a 15N pre-pressing force;

[0044] 6. Cutting execution: the cutter fixed plate 41 continues to descend by 3mm, the cutter 42 cuts off the water port at a speed of 0.5m / s, and the heating rod 43 synchronously maintains the material viscoelastic state;

[0045] 7. Stroke control: when the stroke limiting block 62 contacts the adjusting bolt 61, the lifting cylinder 21 automatically returns, completing a single operation cycle.

[0046] According to actual measurement, the embodiment realizes the following in the TPU shoe sole water port processing: single piece processing time ≤6 seconds (traditional process needs 12 seconds); burr height ≤0.02mm.

[0047] The utility model discloses an automatic punching machine for injection molding water port, aiming at the efficient processing of TPU shoe sole water port, innovatively designs the heating rod + diamond-like coating cutter cutting system, makes the material be in viscoelastic state through accurate temperature control, combines the profiling groove positioning and double-cylinder cooperative drive, realizes burr ≤0.02mm, single piece processing time ≤6 seconds, and integrates infrared induction + double-hand safety switch.

[0048] Finally, it should be noted that: the above only for the preferred embodiment of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. An automatic punching machine for injection molding nozzle, characterized in that, It includes: Workbench (1); lifting mechanism (2), fixed on the workbench (1), including: vertical lifting cylinder (21), its cylinder is fixed on the workbench (1); two parallel guide columns (22) are vertically fixed on the workbench (1) and located on both sides of the lifting cylinder (21); lifting plate (23) is slidably connected with the guide column (22) and is fixedly connected with the piston rod of the lifting cylinder (21); upper die mechanism (4) is fixed below the lifting plate (23), including: cutter fixing plate (41) rigidly connected with the lifting plate (23); cutter (42) and heating rod (43) fixed on the cutter fixing plate (41); pre-pressing plate (45) elastically connected to the lifting plate (23) through pre-pressing spring (46), and the pre-pressing plate (45) is located below the cutter fixing plate (41); upper die plate (47) fixed on the bottom of the pre-pressing plate (45); propulsion mechanism (3) includes: horizontally arranged guide rail (32) fixed on the surface of the workbench (1); push plate (31) is slidably connected with the guide rail (32); drive cylinder (33) is fixed on the side surface of the workbench (1), and the piston rod thereof is connected with the push plate (31); lower die mechanism (5) is fixed on the push plate (31) and includes lower die plate (51) for positioning injection molded parts; stroke adjusting mechanism (6) includes adjusting bolt (61) fixed on the workbench (1) and stroke limiting block (62) fixed on the bottom of the lifting plate (23), and the lifting stroke is controlled by the contact position of the adjusting bolt (61) and the stroke limiting block (62).

2. The automatic punching and cutting machine for injection molding nozzle according to claim 1, characterized in that, The propulsion mechanism (3) further includes cylinder limiting block (34) symmetrically arranged on both sides of the push plate (31), and the end of the piston rod of the drive cylinder (33) is hinged to the push plate (31) through a floating joint.

3. The automatic punching and cutting machine for injection molding nozzle according to claim 1, characterized in that, The cutting edge surface of the cutter (42) is coated with a diamond-like coating, the thickness of the coating is 2-5μm, and the hardness is ≥3000HV.

4. The automatic punching and cutting machine for injection molding nozzle according to claim 1, characterized in that, The heating rod (43) is provided with a PID temperature control module, the working temperature range is 50-100℃, and the temperature sensor (44) signal is connected; the compression stroke of the pre-pressing spring (46) is adjustable, and the pre-pressing force range is 5-20N.

5. The automatic punching and cutting machine for injection molding nozzle according to claim 1, characterized in that, The surface of the lower die plate (51) is provided with a profiling groove matched with the cutter (42), and the depth of the profiling groove is 3-5mm.

6. The automatic punching and cutting machine for injection molding nozzle according to claim 1, characterized in that, Linear bearings are arranged between the guide column (22) and the lifting plate (23), the inner ring of the linear bearing is clearance fitted with the guide column (22), and the clearance amount is 0.02-0.05mm.

7. The automatic punching and cutting machine for injection molding nozzle according to claim 1, characterized in that, Infrared sensing devices (7) are arranged on both sides of the workbench (1), the detection area covers the movement path of the lifting mechanism (2), and is interlocked with the control circuit of the lifting cylinder (21); a double-hand trigger type safety switch (8) is further arranged on the workbench (1), and the safety switch (8) is connected in series in the drive circuit of the lifting cylinder (21).

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