Die-casting workpiece production system based on zero compensation

Abstract

The invention discloses a die-casting workpiece production system based on zero compensation. The die-casting workpiece production system comprises die-casting equipment used for preparing die-casting workpieces, a control module used for stacking the die-casting workpieces and a verification module. Relates to the technical field of die casting, and solves the technical problems that in order to facilitate taking of die-casting workpieces, height difference occurs when the workpieces are stacked, and stress impact and falling of the workpieces are possibly caused when the workpieces are stacked. An absolute zero plane and a relative zero plane are introduced on the basis of the height of the movable female die and the height of the fixed male die, and when materials are pressed downwards and a stacking arm is controlled to stack die-casting workpieces subjected to die casting, the absolute zero plane and the relative zero plane serve as references; and damage to the die-casting workpieces caused by height errors when the die-casting workpieces are taken out during subsequent stacking can be avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of die casting, in particular to a die casting workpiece production system based on zero position compensation. Background Art

[0002] The thickness of the die-cast workpiece during the pressing process is affected by the injection volume of the mold cavity and the compaction density (pressure). Its measurement is limited by the zero position of the mold. Generally speaking, the zero position of the mold is adjusted well, and the actual position value of the mold surface after pressing = the thickness of the blank. However, there will be no problem in the automatic blank picking and stacking system based on the actual position value of the mold surface after pressing to automatically pick up and stack the blanks. Due to the debugging accuracy and the removal of the blank from the mold cavity, the bottom surface of the blank must be higher than the zero plane and completely out of the mold cavity, so that the blank is easier to remove. Therefore, the actual position value of the mold surface > the thickness of the blank, resulting in the stacking device positioning and setting the height of the automatic blank picking and stacking based on the actual position value of the mold surface after pressing. There is a height error when the stacking device is automatically picking up and stacking. When stacking to a certain height, the height difference will become larger and larger, which will cause stress shock and falling. For the newly die-cast workpiece, collision will reduce the stress performance of the workpiece. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes a die-casting workpiece production system based on zero-position compensation, which is used to solve the technical problem that in order to facilitate the picking up of the die-casting workpieces, a height difference occurs when the workpieces are stacked, which may cause stress shock and falling of the workpieces during stacking. The present invention solves the above-mentioned problem by using the absolute zero plane and the relative zero plane as reference for calculation when pressing down the material and controlling the stacking arm to stack the die-casting workpieces after die-casting based on the height of the movable die and the fixed punch.

[0004] To achieve the above-mentioned object, a first aspect of the present invention provides a die-casting workpiece production system based on zero-position compensation, comprising: a die-casting device for preparing the die-casting workpiece and a control module for stacking the die-casting workpiece;

[0005] The die-casting equipment comprises a base frame, a lifting cylinder is installed in the base frame, a movable die is arranged on the output end of the lifting cylinder, a material injection plate is arranged on the top of the movable die, a fixed punch matched with the movable die is arranged on the base frame, a hydraulic cylinder is arranged above the base frame, a linkage cylinder capable of driving a feeding mechanism to move is arranged on one side of the hydraulic cylinder, and a stacking arm for clamping the die-casting workpiece is arranged on the other side of the hydraulic cylinder;

[0006] The control module: calibrates the relative zero plane according to the absolute zero plane; wherein the absolute zero plane is the top surface height of the fixed punch, and the relative zero plane is the top surface height of the movable die; and,

[0007] The die-casting workpieces are palletized by controlling the moving height of the palletizing arm according to the calibrated relative zero plane.

[0008] Through the control module and the die casting equipment, the die casting

[0009] Preferably, the calibrating the relative zero plane according to the absolute zero plane comprises:

[0010] Control the hydraulic cylinder to move downward until the difference between the relative zero plane and the absolute zero plane is equal to the zero position compensation value;

[0011] The zero position compensation value is obtained by controlling the lifting cylinder to drive the movable die to move to the bottom, measuring the distance between the absolute zero plane and the relative zero plane and marking it as the zero position compensation value.

[0012] Preferably, the method of stacking the die-cast workpieces by controlling the moving height of the stacking arm according to the calibrated relative zero plane comprises:

[0013] S1: Control the picking end of the palletizing arm to move to the top of the movable die, and adjust the height of the picking end on the palletizing arm based on the height of the palletizing arm and the distance relative to the zero plane;

[0014] S2: Control the stacking arm to clamp the die-cast workpiece and move it above the stacking platform; calculate the stacking height H by the formula H=d+i×T+a; where d is the height of the stacking platform, i is the number of stacking times, T is the thickness of the die-cast workpiece, and a is the reserved height; and the thickness T of the die-cast workpiece is the height relative to the zero plane after die-casting is completed minus the absolute zero plane and the zero position compensation value;

[0015] S3: Compare the reserved height with the height threshold; when the reserved height is less than the height threshold, the stacking arm is controlled to move to the stacking position and then put down based on the stacking height; otherwise, the stacking arm is controlled to stack according to the preset interval and the stacking times i are cleared.

[0016] It should be noted that when the stacking height is greater than the height threshold, the stacking height is calculated as the sum of the height of the stacking platform and the reserved height.

[0017] Preferably, the step of adjusting the height of the pickup end on the palletizing arm based on the height of the palletizing arm and the distance relative to the zero plane comprises:

[0018] The height of the palletizing arm and the height relative to the zero plane are obtained and the absolute value of the difference is calculated to obtain the adjusted height, and the picking end on the palletizing arm is controlled to move downward, and the height of the downward movement is the adjusted height.

[0019] Preferably, the die-casting equipment also includes a press feeding pump for feeding, the discharge end of the press feeding pump is connected to a feeding mechanism, the feeding mechanism is located above the injection plate, one side of the hydraulic cylinder is provided with a linkage cylinder capable of driving the feeding mechanism to move, the other side of the hydraulic cylinder is provided with a stacking arm for clamping the die-casting workpiece, the output end of the hydraulic cylinder is installed with a die-casting block for providing pressure, when the movable die is raised, a die-casting groove for placing the material groove is formed between the movable die and the fixed punch, and the die-casting block is used to die-cast the die-casting material in the die-casting groove.

[0020] Preferably, the verification module is also included, and the verification module: determines whether the thickness of the die-cast workpiece is qualified; if yes, controls the stacking arm to take out the die-cast workpiece; otherwise, calculates the injection compensation amount and replenishes the material into the die-casting tank.

[0021] Preferably, the step of judging whether the thickness of the die-cast workpiece is qualified comprises:

[0022] After the die-cast workpiece is completed, the height difference between the top of the die-cast workpiece and the absolute zero plane is obtained to obtain the actual thickness;

[0023] The actual thickness is compared with the thickness standard range. When the actual thickness is within the thickness standard range, the thickness of the die-cast workpiece is marked as qualified; otherwise, the thickness of the die-cast workpiece is marked as unqualified.

[0024] Preferably, the step of calculating the injection compensation amount and performing the filling comprises:

[0025] Obtain the height a1 of the die-cast workpiece relative to the zero plane before die-casting and the height a2 of the die-cast workpiece relative to the zero plane after die-casting; obtain the compression ratio by calculating the ratio of a1 to a2; calculate the product of the difference between the actual thickness and the median of the standard range and the compression ratio to obtain the injection compensation amount; and fill the material according to the injection compensation amount.

[0026] At this time, the sum of the mold injection ejection height and the injection compensation amount is the mold surface ejection height when the next mold is injected. The mold surface ejection height when the next mold is injected is the injection amount of the next mold, thereby realizing automatic adjustment of the thickness of the die-casting workpiece.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: based on the height of the movable die and the fixed punch, an absolute zero plane and a relative zero plane are introduced, and when the material is pressed down and when the stacking arm is controlled to stack the die-cast workpieces after die-casting, the absolute zero plane and the relative zero plane are used as references, so that damage to the die-cast workpiece caused by height errors when taking out the die-cast workpieces can be avoided during subsequent stacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the die-casting equipment in the present invention in a non-die-casting state;

[0030] Figure 2 It is a schematic diagram of the die-casting equipment in the present invention in the die-casting state.

[0031] In the figure, 1. base frame; 2. lifting cylinder; 3. fixed punch; 4. movable die; 5. hydraulic cylinder; 6. die-casting block; 7. press feed pump; 8. injection plate; 9. feeding mechanism; 10. linkage cylinder; 11. stacking arm; 12. die-casting tank. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 2 , a first aspect of the present invention provides a die-casting workpiece production system based on zero-position compensation, comprising: a die-casting device for preparing a die-casting workpiece, a control module for stacking the die-casting workpiece, and a verification module;

[0034] The die-casting equipment includes a base frame 1 and a press feed pump 7 for feeding materials. A lifting cylinder 2 is installed in the base frame 1. A movable die 4 is arranged on the output end of the lifting cylinder 2. A material injection plate 8 is arranged on the top of the movable die 4. A fixed punch 3 cooperating with the movable die 4 is also arranged on the base frame 1. A hydraulic cylinder 5 is also arranged above the base frame 1. A linkage cylinder 10 capable of driving a feeding mechanism 9 to move is arranged on one side of the hydraulic cylinder 5. A stacking arm 1 for clamping die-casting workpieces is arranged on the other side of the hydraulic cylinder 5. 1, the discharge end of the press pump 7 is connected with a feeding mechanism 9, and the feeding mechanism 9 is located above the injection plate 8. A linkage cylinder 10 capable of driving the feeding mechanism 9 to move is provided on one side of the hydraulic cylinder 5, and a stacking arm 11 for clamping the die-casting workpiece is provided on the other side of the hydraulic cylinder 5. A die-casting block 6 for providing pressure is installed at the output end of the hydraulic cylinder 5. When the movable concave die 4 is raised, a die-casting groove 12 for placing a material groove is formed between the movable concave die 4 and the fixed convex die 3, and the die-casting block 6 is used to die-cast the die-casting material in the die-casting groove 12.

[0035] The control module: calibrates the relative zero plane according to the absolute zero plane; wherein the absolute zero plane is the top surface height of the fixed punch 3, and the relative zero plane is the top surface height of the movable die 4; and,

[0036] The die-cast workpieces are stacked by controlling the moving height of the stacking arm 11 according to the calibrated relative zero plane;

[0037] Specifically, calibrating the relative zero plane according to the absolute zero plane includes:

[0038] The hydraulic cylinder is controlled by the PLC controller to move downward until the difference between the relative zero plane and the absolute zero plane is equal to the zero position compensation value. After completing the above debugging, the material die-casting work can begin;

[0039] In this embodiment, the method for obtaining the zero position compensation value is: control the lifting cylinder 2 to drive the movable die 4 to move to the bottom, measure the distance between the absolute zero plane and the relative zero plane and mark it as the zero position compensation value, and a groove with the same depth as the zero position compensation value begins to appear on the die-casting block 6.

[0040] In order to avoid the error caused by the fixed punch protruding a certain height in order to facilitate the removal of the die-cast workpiece, in this embodiment, the die-cast workpiece is stacked by controlling the moving height of the stacking arm 11 according to the calibrated relative zero plane, including:

[0041] S1: Control the picking end of the palletizing arm 11 to move to the top of the movable die 4, and adjust the height of the picking end on the palletizing arm 11 based on the height of the palletizing arm 11 and the distance relative to the zero plane;

[0042] S2: Control the stacking arm 11 to clamp the die-cast workpiece and move it above the stacking platform; calculate the stacking height H by the formula H=d+i×T+a; wherein d is the height of the stacking platform, i is the number of stacking times, T is the thickness of the die-cast workpiece, and a is the reserved height; and the thickness T of the die-cast workpiece is the height relative to the zero plane after die-casting is completed minus the absolute zero plane and the zero position compensation value; wherein the value of a is greater than or equal to the maximum value of the workpiece error range, and the value of a changes proportionally according to the number of stacking times;

[0043] S3: Compare the reserved height with the height threshold; when the reserved height is less than the height threshold, control the stacking arm to move to the stacking position and then put it down based on the stacking height; otherwise control the stacking arm 11 to stack according to the preset interval, and reset the stacking times i to zero.

[0044] In this embodiment, when the stacking height is greater than the height threshold, the stacking height is calculated as the sum of the height of the stacking platform and the reserved height.

[0045] Specifically, adjusting the height of the pickup end on the palletizing arm 11 based on the height of the palletizing arm 11 and the distance relative to the zero plane includes:

[0046] The height of the stacking arm 11 and the height relative to the zero plane are obtained and the absolute value of the difference is calculated to obtain the adjusted height, and the picking end on the stacking arm 11 is controlled to move downward, and the height of the downward movement is the adjusted height.

[0047] Verification module: determine whether the thickness of the die-cast workpiece is qualified; if yes, control the stacking arm 11 to take out the die-cast workpiece; otherwise, obtain the height a1 of the die-cast workpiece relative to the zero plane before die-casting and the height a2 of the die-cast workpiece relative to the zero plane after die-casting; obtain the compression ratio by calculating the ratio of a1 to a2; calculate the difference between the actual thickness and the median of the standard range and the product of the compression ratio to obtain the injection compensation amount; and fill the material according to the injection compensation amount.

[0048] At this time, the sum of the mold injection ejection height and the injection compensation amount is the mold surface ejection height when the next mold is injected. The mold surface ejection height when the next mold is injected is the injection amount of the next mold, thereby realizing automatic adjustment of the thickness of the die-casting workpiece.

[0049] In this embodiment, judging whether the thickness of the die-cast workpiece is qualified specifically includes the following steps:

[0050] After the die-cast workpiece is completed, the height difference between the top of the die-cast workpiece and the absolute zero plane is obtained to obtain the actual thickness;

[0051] The actual thickness is compared with the thickness standard range. When the actual thickness is within the thickness standard range, the thickness of the die-cast workpiece is marked as qualified; otherwise, the thickness of the die-cast workpiece is marked as unqualified.

[0052] Part of the data in the above formula is calculated by removing the dimension and taking its numerical value. The formula is a formula closest to the actual situation obtained by software simulation of a large amount of collected data; the preset parameters and preset thresholds in the formula are set by technical personnel in this field according to actual conditions or obtained through simulation of a large amount of data.

[0053] The working principle of the present invention is as follows: first, the relative zero plane is calibrated according to the absolute zero plane, and then the lifting cylinder 2 is controlled to shrink again, so that a die-casting groove 12 is formed between the movable die 4 and the fixed punch 3. At this time, the material is transported to the feeding mechanism 9 through the press pump 7, and the feeding mechanism 9 is moved on the injection plate 8 by controlling the movement of the linkage cylinder 10 to complete the injection of material into the die-casting groove 12. Then, the pressure head 6 on the hydraulic cylinder 5 is controlled to move downward, and the movable die 4 is pushed downward, so as to apply pressure to the material in the die-casting groove 12 and maintain the pressure. After the die-casting is formed, the height of the stacking arm 11 is controlled to move according to the calibrated relative zero plane to stack the die-casting workpieces.

[0054] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A die-casting workpiece production system based on zero position compensation, characterized in that: include: A die-casting device for preparing die-cast workpieces and a control module for palletizing the die-cast workpieces; The die-casting equipment comprises a base frame (1), a lifting cylinder (2) is installed in the base frame (1), a movable die (4) is arranged on the output end of the lifting cylinder (2), a material injection plate (8) is arranged on the top of the movable die (4), a fixed punch (3) matched with the movable die (4) is also arranged on the base frame (1), a hydraulic cylinder (5) is also arranged above the base frame (1), a linkage cylinder (10) capable of driving a feeding mechanism (9) to move is arranged on one side of the hydraulic cylinder (5), and a stacking arm (11) for clamping the die-casting workpiece is arranged on the other side of the hydraulic cylinder (5); The control module calibrates the relative zero plane according to the absolute zero plane; wherein the absolute zero plane is the top surface height of the fixed punch (3), and the relative zero plane is the top surface height of the movable die (4); as well as, The die-cast workpieces are stacked by controlling the moving height of the stacking arm (11) according to the calibrated relative zero plane.

2. The die-casting workpiece production system based on zero position compensation according to claim 1 is characterized in that: The calibrating the relative zero plane according to the absolute zero plane comprises: Control the hydraulic cylinder to move downward until the difference between the relative zero plane and the absolute zero plane is equal to the zero position compensation value; The method for obtaining the zero position compensation value is: controlling the lifting cylinder (2) to drive the movable die (4) to move to the bottom, measuring the distance between the absolute zero plane and the relative zero plane and marking it as the zero position compensation value.

3. The die-casting workpiece production system based on zero position compensation according to claim 1 is characterized in that: The method of stacking the die-cast workpieces by controlling the moving height of the stacking arm (11) according to the calibrated relative zero plane comprises: S1: Control the picking end of the stacking arm (11) to move to the top of the movable die (4), and adjust the height of the picking end on the stacking arm (11) based on the height of the stacking arm (11) and the distance relative to the zero plane; S2: Control the stacking arm (11) to clamp the die-cast workpiece and move it to the top of the stacking platform; calculate the stacking height H by the formula H=d+i×T+a; wherein d is the height of the stacking platform, i is the number of stacking times, T is the thickness of the die-cast workpiece, and a is the reserved height; S3: Compare the reserved height with the height threshold; when the reserved height is less than the height threshold, control the stacking arm to move to the stacking position and then put it down based on the stacking height; otherwise, control the stacking arm (11) to stack according to the preset interval, and reset the stacking times i to zero.

4. The die-casting workpiece production system based on zero position compensation according to claim 3 is characterized in that: The method of adjusting the height of the picking end of the stacking arm (11) based on the height of the stacking arm (11) and the distance relative to the zero plane comprises: The height of the stacking arm (11) and the height relative to the zero plane are obtained and the absolute value of the difference is calculated to obtain the adjustment height, and the picking end on the stacking arm (11) is controlled to move downward, and the height of the downward movement is the adjustment height.

5. The die-casting workpiece production system based on zero position compensation according to any one of claims 1 to 4, characterized in that: The die-casting equipment also includes a press pump (7) for feeding materials. The discharge end of the press pump (7) is connected to a feeding mechanism (9). The feeding mechanism (9) is located above the injection plate (8). A linkage cylinder (10) capable of driving the feeding mechanism (9) to move is provided on one side of the hydraulic cylinder (5). A stacking arm (11) for clamping the die-casting workpiece is provided on the other side of the hydraulic cylinder (5). A die-casting block (6) for providing pressure is installed at the output end of the hydraulic cylinder (5). When the movable die (4) is raised, a die-casting groove (12) for placing a material groove is formed between the movable die and the fixed convex die (3). The die-casting block (6) is used to die-cast the die-casting material in the die-casting groove (12).

6. The die-casting workpiece production system based on zero position compensation according to claim 1 is characterized in that: The invention also includes a verification module, which determines whether the thickness of the die-cast workpiece is qualified; if so, controls the stacking arm (11) to take out the die-cast workpiece; otherwise, calculates the injection compensation amount and performs material replenishment.

7. The die-casting workpiece production system based on zero position compensation according to claim 6 is characterized in that: The method of judging whether the thickness of the die-cast workpiece is qualified includes: After the die-cast workpiece is completed, the height difference between the top of the die-cast workpiece and the absolute zero plane is obtained to obtain the actual thickness; The actual thickness is compared with the thickness standard range. When the actual thickness is within the thickness standard range, the thickness of the die-cast workpiece is marked as qualified; otherwise, the thickness of the die-cast workpiece is marked as unqualified.

8. The die-casting workpiece production system based on zero position compensation according to claim 6 or 7, characterized in that: The method of calculating the injection compensation amount and performing the filling process comprises: Obtain the height a1 of the die-cast workpiece relative to the zero plane before die-casting and the height a2 of the die-cast workpiece relative to the zero plane after die-casting; obtain the compression ratio by calculating the ratio of a1 to a2; calculate the product of the difference between the actual thickness and the median of the standard range and the compression ratio to obtain the injection compensation amount; and fill the material according to the injection compensation amount.

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