A die casting trimming apparatus

Abstract

The utility model discloses a die casting part edge cutting equipment, including lower mould unit and upper mould unit, the upper mould unit includes fixed upper die holder, movable punch, drive mechanism and upper mould clamping subassembly, and the lower mould unit includes lower die holder and the lower mould positioning block on the lower die holder, drive mechanism is located on fixed upper die holder, and its lower extreme connects movable punch and drives movable punch relative lower mould unit up and down motion, is equipped with the limit rod on movable punch, is equipped with the safety hook subassembly on fixed upper die holder, upper mould clamping subassembly is located on movable punch, when movable punch presses down and cuts and completes, upper mould clamping subassembly clamps die casting, and drive mechanism drives movable punch to go up, and die casting goes up with movable punch synchronism to separate lower mould positioning block, when movable punch moves to the preposition, and the safety hook subassembly stretches out to the limit portion below the limit rod, to prevent movable punch from falling due to gravity when mechanical failure.

Description

Technical Field

[0001] This utility model relates to the technical field of die casting processing equipment, and in particular to a die casting edge trimming equipment. Background Technology

[0002] After die casting, die-cast parts often have excess residual structures such as runner systems, sprues, flash, and burrs on their edges. These structures not only affect the appearance and quality of the product but may also hinder subsequent assembly and use. Therefore, they need to be removed and cleaned through a finishing process. In traditional processes, edge trimming machines are often used for automated or semi-automated processing to improve processing efficiency and consistency.

[0003] In existing technologies, trimming machines typically include a mold system consisting of an upper and lower mold, which works in conjunction with a hydraulic or pneumatic drive mechanism to achieve the cutting action. For example, the utility model patent CN223011844U, entitled "A Hydraulic Trimming Mold for Die Castings," discloses a trimming mold comprising a lower mold, an upper mold, a cover plate, a base plate, and a trimming blade. The cover plate and base plate work together to press the workpiece, and the trimming blade removes the protrusions. Another example is the utility model patent CN112605233B, entitled "Trimming Mold for Die Castings," which uses a conformal pressure plate and a conformal support plate to work with the die casting surface, achieving one-time trimming and shaping functions, significantly improving trimming accuracy and workpiece quality. Furthermore, the utility model patent CN222919551U, entitled "A High-Efficiency Trimming Mold for Forgings," uses a reverse-cutting structure and a part ejection mechanism to avoid product jamming and facilitate robotic part removal, further improving the level of automation.

[0004] However, existing edge trimming technology still has the following shortcomings: First, after punching, the processed workpiece needs to be removed from the lower die manually or by a robotic arm before the workpiece to be processed is placed. This process takes a lot of time, resulting in a long equipment cycle time and room for improvement in overall processing efficiency. Second, the upper die is usually driven by a hydraulic cylinder or a pneumatic cylinder. If a pressure loss failure occurs, such as a burst pipe, leakage, or valve core jamming, the upper die and its heavy components may fall unexpectedly under gravity, which can easily cause damage to the die, crushing of the workpiece, or even personal injury accidents, posing significant safety hazards. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an efficient and safe edge-cutting device for die-cast parts.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a die casting edge trimming device, including a lower mold unit and an upper mold unit; the upper mold unit includes a fixed upper mold base, a movable punch, a drive mechanism and an upper mold clamping assembly, and the lower mold unit includes a lower mold base and a lower mold positioning block located on the lower mold base;

[0007] The driving mechanism is mounted on the fixed upper die base, and its lower end is connected to the movable die and drives the movable die to move up and down relative to the lower die unit; the movable die is provided with a limit rod, and the fixed upper die base is provided with a safety hook assembly; the upper die clamping assembly is mounted on the movable die.

[0008] After the movable die presses down and punches, the upper die clamping assembly clamps the die casting, and the driving mechanism drives the movable die to move upward. The die casting moves upward synchronously with the movable die to disengage from the lower die positioning block.

[0009] When the movable die moves to the predetermined position, the safety hook assembly extends below the limiting part of the limiting rod to prevent the movable die from falling due to gravity in the event of mechanical failure.

[0010] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the safety hook assembly includes a first cylinder, a limiting block and a sliding seat, and the front end of the limiting block is provided with an actuating part; the limiting rod is provided with a plurality of spaced and protruding limiting parts along the length direction;

[0011] When the movable die moves upward, the limiting block moves horizontally along the sliding seat towards the direction of the limiting rod under the drive of the first cylinder; when the movable die moves to the predetermined position, the height of at least one limiting part exceeds the limiting block, and the actuating part moves below the limiting part.

[0012] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the limiting part is an annular protrusion arranged around the outer periphery of the limiting rod; the side of the fixed upper mold base is provided with a through hole, and the limiting rod passes through the through hole; the front end of the limiting block is provided with an arc-shaped notch, the diameter of the arc-shaped notch is larger than the diameter of the body of the limiting rod and smaller than the diameter of the annular protrusion, and the working part is the solid of the edge of the arc-shaped notch.

[0013] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a safety neutron is provided on one side of the sliding seat. The safety neutron includes a telescopic sensing part. The telescopic sensing part extends out and its front end is located on the movement trajectory of the limiting block. The front end of the telescopic sensing part cooperates with the side of the limiting block in a contact manner to verify that the limiting block is driven by the first cylinder to move in the direction of the limiting rod.

[0014] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the movable die is provided with a stroke rod, the fixed upper die base is provided with a mechanical limit switch, the stroke rod is provided with a stroke trigger part, and the stroke trigger part contacts the mechanical limit switch to stop the drive mechanism from running.

[0015] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the movable die includes a profile punching part located on the lower surface, and the upper die clamping assembly includes a plurality of clamping units disposed around the profile punching part. Each clamping unit includes a second cylinder, a cylinder support, a pressure head, a stroke neutron, and a neutron support. The second cylinder drives the pressure head to move toward the profile punching part to clamp the die casting on the movable die, and the stroke neutron senses and limits the forward and backward movement distance of the pressure head.

[0016] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the copying punching part is provided with a channel, and the pressure head enters the interior of the copying punching part from the channel and acts on the outer side of the die casting.

[0017] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the lower mold unit further includes a first detection photoelectric group and a second detection photoelectric group. The first detection photoelectric group is used to check whether there is a die-casting part on the lower mold positioning block; the second detection photoelectric group is used to check whether the die-casting part is placed in the standard position of the lower mold positioning block; the upper mold unit further includes a third detection photoelectric group, which is used to check whether there is a die-casting part on the movable punch.

[0018] The preferred technical solution adopted by this utility model to solve the above-mentioned technical problems is: including inclined waste channels located on both sides of the lower mold unit.

[0019] Compared with existing technologies, the advantages of this invention are: by actively clamping the workpiece after punching with the upper die clamping assembly and lifting it with the upper die, active demolding of the die casting is achieved, changing the traditional mode of relying on a robotic arm to forcibly remove the workpiece from the lower die or manual removal by the operator. This not only seamlessly integrates the part removal action into the stamping cycle, but also allows for simultaneous mold opening and placement of the next die casting to be processed, significantly shortening the total processing time of a single workpiece and greatly improving production efficiency. More importantly, it avoids the risk of the robotic arm damaging the workpiece or the lower die positioning block, making it particularly suitable for die castings with large clamping forces or complex structures.

[0020] Furthermore, the safety hook assembly and the limit rod work together to form a purely mechanical fall protection device. Typically, the drive mechanism uses hydraulic, pneumatic, or electric methods to drive and hold the movable die. Therefore, the safety of the equipment depends entirely on the stability of the hydraulic and pneumatic pressures; otherwise, the movable die may fall from a height. However, the safety performance of this equipment does not depend on the pressure maintenance of the hydraulic system of the drive mechanism or the continuous effectiveness of the electrical control signal. In the event of any form of pressure loss failure, such as pipe rupture, leakage, or valve core jamming in the drive cylinder, the movable die and the heavy workpiece it holds will be firmly secured by the mechanical hook block the moment it falls under gravity, effectively preventing major safety accidents such as die impact and structural damage, and providing protection for possible maintenance operations below the equipment. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0022] Figure 1 A schematic diagram of a die-casting part trimming device. Figure 1 ;

[0023] Figure 2 A schematic diagram of a die-casting part trimming device. Figure 2 ;

[0024] Figure 3 A schematic diagram of a die-casting part trimming device. Figure 3 ;

[0025] Figure 4 A die casting trimming device Figure 2 A magnified view of a portion of the image;

[0026] Figure 5 A die casting trimming device Figure 3 A magnified view of a portion of the image;

[0027] Figure 6 This is a schematic diagram of the upper mold clamping assembly of a die-casting trimming device. Detailed Implementation

[0028] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0029] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0030] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the die-cast part of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and cannot be considered as limitations on this utility model.

[0031] like Figure 1-3 As shown, this embodiment provides a die-casting part 300 trimming device, including a lower die unit 100 and an upper die unit 200. The upper die unit 200 includes a fixed upper die base 1, a movable punch 2, a drive mechanism 3, and an upper die clamping assembly 4. The lower die unit 100 includes a lower die base 5 and a lower die positioning block 6 located on the lower die base 5.

[0032] like Figure 1-3 As shown, the drive mechanism 3 is mounted on the fixed upper die base 1, and its lower end is connected to the movable die 2, driving the movable die 2 to move up and down relative to the lower die unit 100. The movable die 2 is provided with a limit rod 7, and the fixed upper die base 1 is provided with a safety hook assembly 8. The upper die clamping assembly 4 is mounted on the movable die 2.

[0033] After the movable die 2 completes the downward punching and cutting, the upper die clamping assembly 4 clamps the die casting 300, and the drive mechanism 3 drives the movable die 2 to move upward. The die casting 300 moves upward synchronously with the movable die 2 to disengage from the lower die positioning block 6.

[0034] When the movable die 2 moves to the predetermined position, the safety hook assembly 8 extends below the limiting part 70 of the limiting rod 7 to prevent the movable die 2 from falling due to gravity in the event of mechanical failure.

[0035] The operation method of this 300mm edge trimming equipment for die-cast parts includes the following steps:

[0036] Step 1: The die-cast part 300 is placed on the lower mold positioning block 6 by the robotic arm.

[0037] Step 2: The upper die clamping assembly 4 exits the interference zone of the active punch die 2.

[0038] Step 3: The safety hook assembly 8 retracts and disengages from the limit bar 7.

[0039] Step 4: Drive mechanism 3 drives movable die 2 to descend and act on die casting 300 to complete punching.

[0040] Step 5: The upper mold clamping assembly 4 clamps the die-casting part 300.

[0041] Step 6: Drive mechanism 3 drives movable die 2 and die casting part 300 to rise together.

[0042] Step 7: The safety hook assembly 8 extends below the limiting part 70 of the limiting rod 7.

[0043] Step 8: The robotic arm grips the die-cast part 300.

[0044] Step 9: Release the upper mold clamping assembly 4 from clamping the die-casting part 300.

[0045] Step 10: The robotic arm removes the die-cast part 300 from the movable die 2.

[0046] Therefore, by actively clamping the workpiece after punching with the upper die clamping assembly 4 and lifting it with the upper die, the die casting 300 is actively demolded, changing the traditional mode of relying on a robot to forcibly remove it from the lower die or for the operator to manually remove it. This not only seamlessly integrates the part removal action into the stamping cycle, but also allows for simultaneous mold opening and placement of the next die casting 300 to be processed, significantly shortening the total processing time for a single workpiece and greatly improving production efficiency. More importantly, it avoids the risk of the robot pulling on the workpiece or damaging the lower die positioning block 6, making it particularly suitable for die castings 300 with large clamping forces or complex structures.

[0047] Furthermore, the safety hook assembly 8 and the limit rod 7 work together to form a purely mechanical fall protection device. Normally, the drive mechanism 3 drives and holds the movable die 2 via hydraulic, pneumatic, or electrical means. Therefore, the safety of the equipment depends entirely on the stability of the hydraulic and pneumatic pressures; otherwise, the movable die 2 may fall from a height. However, the safety performance of this equipment does not depend on the pressure maintenance of the hydraulic system of the drive mechanism 3 or the continuous effectiveness of the electrical control signal. In the event of any form of pressure loss failure such as pipe rupture, leakage, or valve core jamming in the drive cylinder or pneumatic cylinder, the movable die 2 and the heavy workpiece it holds will be firmly secured by the mechanical hook block the moment it falls under gravity, effectively preventing major safety accidents such as die smashing and structural damage, and providing protection for possible maintenance operations below the equipment.

[0048] like Figure 1-3 As shown, a die-casting part 300 trimming device also includes inclined scrap channels 400 located on both sides of the lower die unit 100. After punching, the punched-off material stalks and flow channels will slide down along the inclined scrap channels 400 under the action of gravity and directly enter the scrap collection box or conveyor belt. This eliminates the need for manual periodic cleaning of the mold surface for scrap.

[0049] like Figure 2 , 4 As shown, the safety hook assembly 8 includes a first cylinder 81, a limiting block 82, and a sliding seat 83. The front end of the limiting block 82 is provided with an actuating part 820. The limiting rod 7 is provided with a plurality of spaced and protruding limiting parts 70 along its length.

[0050] like Figure 4 As shown, the first cylinder 81 and the sliding seat 83 are fixed to the upper surface of the fixed upper mold base 1, with the sliding seat 83 near the edge of the side where the limiting rod 7 is located. In this embodiment, the limiting block 82 includes a body 821 and a downwardly extending sliding edge 822. The sliding edge 822 is located outside the two straight-extending sides of the sliding seat 83. The limiting block 82 moves back and forth along the straight line of the sliding block, and the sliding seat 83 provides support and guidance for the movement of the limiting block 82.

[0051] The working process of the safety hook assembly 8 is as follows: When the movable die 2 moves upward, the limiting block 82 moves horizontally along the sliding seat 83 towards the direction of the limiting rod 7 under the drive of the first cylinder 81. When the movable die 2 moves to the predetermined position, the height of at least one limiting part 70 exceeds the limiting block 82, and the actuating part 820 moves below the limiting part 70.

[0052] The multiple spaced limiting parts 70 form a multi-level safety step. Even if the movable die 2 does not stop precisely at the preset highest point due to a program error or sensor malfunction, as long as it stops on any of the limiting parts 70, the safety hook can effectively extend and lock it. This greatly reduces the probability of the safety system failing due to a single point of failure and improves the safety margin of the entire device.

[0053] like Figure 4 As shown, the limiting part 70 is an annular protrusion surrounding the outer periphery of the limiting rod 7. A through hole 10 is provided on the side of the fixed upper mold base 1, through which the limiting rod 7 passes. The front end of the limiting block 82 is provided with an arc-shaped notch 824. The diameter of the arc-shaped notch 824 is larger than the diameter of the body of the limiting rod 7 and smaller than the diameter of the annular protrusion. The actuating part 820 is a solid part of the edge of the arc-shaped notch 824.

[0054] The design of the annular protrusion makes the safety protection independent of the circumferential angle of the limiting rod 7. Regardless of whether the movable die 2 rotates during its ascent, the limiting block 82 can effectively hold the annular protrusion at any angle, eliminating the need for additional orientation mechanisms and simplifying the assembly and debugging process. The engagement of the arc-shaped notch 824 with the body of the limiting rod 7 provides excellent guidance and radial positioning during the horizontal movement of the limiting block 82. This ensures that the active part moves smoothly and accurately directly below the annular protrusion, avoiding rigid impacts, wear, or jamming caused by misalignment between the limiting block 82 and the limiting rod 7, thus extending the service life of the components.

[0055] like Figure 4 As shown, a safety neutron 84 is provided on one side of the sliding seat 83. The safety neutron 84 includes a telescopic sensing part 841, which extends out and has its front end positioned on the movement trajectory of the limiting block 82. The front end of the telescopic sensing part 841 engages with the side of the limiting block 82 in a contact manner to verify that the limiting block 82 is driven by the first cylinder 81 to move towards the limiting rod 7. By providing the safety neutron 84, a critical electrical signal can be provided to directly confirm that the limiting block 82 has physically extended into place. This signal is sent to the equipment control system as a necessary prerequisite for allowing the next dangerous action.

[0056] like Figure 4 As shown, the telescopic sensing unit 841 is connected to the base 842 via an elastic element, thereby contacting the limiting block 82 in a flexible manner. In addition, the telescopic sensing unit 841 includes a guide roller 840, which can roll along the side of the limiting block 82 to avoid hard friction between the safety neutron 84 and the limiting block 82 during the movement of the limiting block 82.

[0057] like Figure 4 As shown, the movable die 2 is provided with a stroke rod 9, the fixed upper die base 1 is provided with a mechanical limit switch 11, the stroke rod 9 is provided with a stroke trigger part 91, and the stroke trigger part 91 contacts the mechanical limit switch 11 to stop the drive mechanism 3 from running.

[0058] The mechanical limit switch 11 and the limit lever 9 work together to determine the upper limit of the movable die 2, thereby stopping the drive mechanism 3 from driving the movable die 2 in a timely manner. It is a physical protection layer independent of the control system positioning program. Even if the drive mechanism 3 program is faulty or the servo driver fails, causing the movable die 2 to exceed the preset upper limit, the command of the mechanical limit switch 11 can act as a defense, cutting off the power source and preventing the movable die 2 from moving excessively upward.

[0059] like Figure 5 As shown, the movable die 2 includes a contouring punching section 20 located on its lower surface. The upper die clamping assembly 4 includes multiple clamping units 40 disposed around the contouring punching section 20. Each clamping unit 40 includes a second cylinder 41, a cylinder support 42, a pressure head 43, a stroke neutron 44, and a neutron support 45. The second cylinder 41 drives the pressure head 43 to move toward the contouring punching section 20 to clamp the die-casting part 300 onto the movable die 2. The stroke neutron 44 senses and limits the forward and backward movement distance of the pressure head 43.

[0060] like Figure 5 , 6As shown, the piston of the second cylinder 41 is a bidirectional piston, with one end connected to the pressure head 43 and the other end connected to a contact block 46. The neutron support 45 is mounted on the cylinder support 42, with the working end of the stroke neutron 44 facing the contact block 46. When the second cylinder 41 drives the pressure head 43 to retract, the contact block 46 moves backward toward the working end of the stroke neutron 44 until the two contact each other, triggering the stroke neutron 44 and stopping the second cylinder 41.

[0061] In this embodiment, the contour-following punching section 20 closely matches the workpiece shape, ensuring uniform force distribution along the punching edge. Multiple independently controlled clamping units 40 can be arranged according to the complex shape of the die-casting part 300, applying clamping force from the optimal angle. This design adapts to slight product deformation, stably gripping various irregularly shaped parts and avoiding interference and dead-angle problems that may exist with a single large gripper. The stroke neutron 44 controls the forward and backward position of the pressure head 43, ensuring that the pressure head 43 clamps the die-casting part 300 while preventing excessive movement and compression of the die-casting part 300. Furthermore, the stroke neutron 44 can be adjusted in front-to-back distance using the neutron support 45.

[0062] like Figure 5 , 6 As shown, the copying punching section 20 is provided with a channel 201. The pressure head 43 enters the interior of the copying punching section 20 through the channel 201 and acts on the outer surface of the die casting 300, thereby accurately clamping it to the appropriate position of the die casting 300.

[0063] like Figure 1 As shown, the lower mold unit 100 also includes a first detection photoelectric group 101 and a second detection photoelectric group 102. The first detection photoelectric group 101 is used to check whether there is a die-cast part 300 on the lower mold positioning block 6, to prevent the equipment from firing without contact and to protect the mold. The second detection photoelectric group 102 is used to check whether the die-cast part 300 is placed in the standard position on the lower mold positioning block 6, which can effectively avoid accidents caused by robot placement deviation or foreign objects on the positioning block, and prevent batch scrap and serious damage to the mold.

[0064] like Figure 1 As shown, the upper die unit 200 also includes a third detection photoelectric group 103, which is used to check whether there is a die-cast part 300 on the movable die 2. This verifies whether the upper die part-removing action is successful. Only after confirming that the workpiece has been reliably clamped and lifted will the system allow the next step to be executed, preventing logical errors such as the upper die not having a part but the system thinking there is a part, which could lead to production interruption or robot abnormality.

[0065] These three sets of sensors provide complete workpiece flow status information for the entire automation unit, which is conducive to achieving unmanned operation and intelligent production, and ensures the continuity and reliability of the production process.

[0066] This article uses specific examples to describe the die-casting trimming device provided by this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

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