A high-precision laser cutting fixture for hot-formed parts

Abstract

The present invention relates to the technical field of thermoforming parts processing equipment, and discloses a high-precision thermoforming parts laser cutting fixture, comprising a cutting bracket, a clamping part installed between cutting parts, a positioning pin, an induction component and a magnetic fixing unit. The positioning pin can change its diameter according to the positioning hole on the part. The induction component is provided with a proximity switch and a proximity switch protection box. The magnetic fixing unit includes a strong magnet that can adsorb the part. The present invention increases the limited radius of the positioning pin so that the positioning pin can be tightly clamped on the hole of the semi-finished product to perform secondary positioning of the semi-finished product and ensure positioning accuracy. The magnetic fixing unit fixes the part, thereby improving production efficiency and product size accuracy and reducing scrap rate.

Description

Technical Field

[0001] The invention relates to the technical field of hot-formed part processing equipment, in particular to a high-precision hot-formed part laser cutting fixture. Background Art

[0002] Semi-finished parts after the thermoforming process can only be trimmed and cut by laser cutting due to their high hardness to be finished. Thermoformed parts have been widely used in automobile bodies. On average, there are 20-30 thermoformed parts on each car. At present, the laser cutting process of thermoformed parts places the semi-finished products after thermoforming on the laser cutting fixture, and uses the flanging holes on the parts and the cylindrical pins on the fixture for positioning, or uses the shape of the product for positioning to ensure the stability and dimensional accuracy of laser cutting. After the thermoformed parts are placed, the proximity switch sensors at multiple positions on the fixture sense that the parts are placed, and the corresponding indicator lights on the fixture are all lit, proving that the parts are in place. The fixture clamps clamp the parts to the fixture and start laser cutting.

[0003] The disadvantages of existing laser cutting fixtures are:

[0004] 1. Use cylindrical pins and punched holes for cooperation. Since the surface of the hot-formed semi-finished product is rough, the contact area between the punched hole surface and the pin is large, and the pin is easily stuck. The stuck pin of the part will cause defects such as difficulty in loading and unloading parts and product deformation, which will affect production efficiency and increase product scrap rate.

[0005] 2. Using the product's own shape for positioning will not cause jamming, but due to the individual size differences between the semi-finished products and the use of surface positioning, there will be sliding between the parts and the cutting fixture, which will cause defects such as unstable positioning and poor positioning accuracy, which will have a great impact on the product's dimensional accuracy.

[0006] 3. The proximity switch is placed directly under the part, and the sensing part of the proximity switch is exposed to the working space. It is very easy to be covered by the dust generated during the cutting process, affecting the accuracy of the sensing signal.

[0007] 4. The clamping points of the clamp are few. When the workbench moves quickly, the parts are affected by the inertia of movement and are prone to slight displacement, which affects the cutting accuracy. Summary of the invention

[0008] In order to solve the problem that the existing cutting fixtures in the above background technology have poor positioning accuracy and are prone to defects such as stuck parts, the present invention provides a high-precision thermoformed parts laser cutting fixture that can improve production efficiency and product dimensional accuracy and reduce scrap rate.

[0009] The present invention provides the following technical solutions:

[0010] A high-precision laser cutting fixture for thermoformed parts includes a cutting bracket, a clamp installed between the cutting parts, a positioning pin, an induction component and a magnetic fixing unit. The positioning pin can change its diameter according to the positioning hole on the part. The induction component is provided with a proximity switch and a proximity switch protection box. The magnetic fixing unit includes a strong magnet that can adsorb the part.

[0011] Preferably, the positioning pin includes an outer pin and an inner pin, the outer wall of the outer pin is limited on the pin mounting plate, the outer pin includes two outer pin bodies, the top of the inner pin is arranged between the outer pin bodies, the top of the inner pin is arranged as a cone with a narrow upper part and a wide lower part, and a positioning cylinder is arranged at the bottom of the inner pin.

[0012] Preferably, a limiting groove is provided on the outer side surface of the outer pin body, and the limiting groove matches with the inner edge of the mounting groove in the middle part of the pin mounting plate.

[0013] Preferably, a reset sleeve is provided on the outer side of the inner pin, a slide groove is provided on the reset sleeve, and a limit screw matching the slide groove is provided on the inner pin.

[0014] Preferably, a felt pad is provided at a position where the signal line and the sensing rod pass through the proximity switch protection box.

[0015] Preferably, the magnetic fixing unit comprises a strong magnet and a fixing cylinder, and the strong magnet is mounted on the top of the fixing cylinder.

[0016] Preferably, the strong magnet is arranged in a copper magnet sliding guide sleeve and can slide up and down in the magnet sliding guide sleeve, and the magnet sliding guide sleeve is fixed on a mounting base on the cutting bracket.

[0017] Preferably, an aluminum magnet mounting seat is provided at the bottom of the strong magnet, the top of the magnet mounting seat is fixedly connected to the strong magnet, and a return pull ring is provided at the bottom of the magnet mounting seat, the return pull ring is clamped with the T-head at one end of the push rod, and the other end of the push rod is fixedly connected to the output end of the fixed cylinder through a cylinder connecting nut.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Design a positioning pin with a variable diameter to cooperate with the circular hole (punched out in the hot forming process) on the semi-finished product. When the semi-finished product is put on and off, the pin radius is reduced, and a large gap is maintained between the pin and the hole to prevent jamming, ensuring that the semi-finished product is put in place. When working, the limited radius of the positioning pin becomes larger, so that the pin can be tightly stuck in the hole of the semi-finished product to perform secondary positioning of the semi-finished product and ensure positioning accuracy.

[0020] 2. The present invention adopts the combination of positioning holes and variable diameter positioning pins to solve the defects of unstable positioning and easy jamming of semi-finished products in laser cutting fixtures in the existing laser cutting process, thereby improving production efficiency and product dimensional accuracy and reducing scrap rate.

[0021] 3. The present invention changes the working structure of the proximity switch of the in-place sensor so that the proximity switch will not be affected by cutting dust.

[0022] 4. The present invention increases the part fixing method and uses the new fixing method to increase the fixing points, so that the positioning of the part on the fixture is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 The present invention is a side view Figure 1 ;

[0025] Figure 3 The present invention is a side view Figure 2 ;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the positioning pin in the present invention;

[0027] Figure 5 It is a schematic diagram of the internal structure of the positioning pin in the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the positioning pin limiting groove in the present invention;

[0029] Figure 7 It is a schematic diagram of the internal structure of the sensing component in the present invention;

[0030] Figure 8 It is a schematic diagram of the internal structure of the magnetic fixing unit in the present invention.

[0031] In the above drawings, cutting bracket 1, clamping member 2, clamping arm 2-1, clamping cylinder 2-2, positioning pin 3, outer pin 3-1, outer pin body 3-11, limiting groove 3-111, inner pin 3-2, cone 3-21, pin mounting plate 3-3, mounting groove 3-31, positioning cylinder 3-4, reset sleeve 3-5, slide groove 3-51, limiting screw 3-52, induction component 4, proximity switch protection box 4-1, felt pad 4-11, induction Response rod 4-2, sensing rod guide sleeve 4-21, return spring 4-22, proximity switch base 4-3, proximity switch mounting plate 4-31, proximity switch 4-4, magnetic fixing unit 5, strong magnet 5-1, magnet sliding guide sleeve 5-11, magnet mounting seat 5-12, return pull ring 5-13, cylinder connecting nut 5-14, push rod 5-15, fixed cylinder 5-2, mounting base 5-3, anti-slip rubber pad 5-4, part 6. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] like Figure 1-3 As shown, the present invention provides a high-precision laser cutting fixture for hot-formed parts, including a cutting bracket 1, a clamping member 2 installed between the cutting parts, a positioning pin 3, an induction component 4 and a magnetic fixing unit 5. The clamping member 2, the positioning pin 3, the proximity switch 4-4 and the magnetic fixing unit 5 can all be set to corresponding positions and quantities according to the needs of the part 6. The positioning pin 3 can change its diameter according to the positioning hole on the part 6. In the hot-forming process, a positioning hole is punched out in the waste area of ​​the semi-finished product (the part cut off in the cutting process, that is, the unnecessary part in the finished product, or the hole of the part 6 itself). The present invention uses the positioning pin 3 with a variable diameter and the positioning hole 3 to form a positioning hole. The positioning holes cooperate with each other, when the diameter of the positioning pin 3 increases or decreases, the positioning pin 3 is in a reduced state, and there is no obstruction between the upper and lower parts. After the semi-finished product is put in place, the positioning pin 3 expands while the clamping part 2 is clamped, so that the positioning pin 3 is tightly combined with the positioning hole to ensure the positioning effect of the semi-finished product; the sensing component 4 is provided with a proximity switch 4-4 and a proximity switch protection box 4-1, the proximity switch 4-4 is used to sense the position of the part, the proximity switch protection box 4-1 has a dust-proof effect on the signal line passing through it, and the magnetic fixing unit 5 includes a strong magnet 5-1 that can adsorb the part 6, which can strongly adsorb the part 6 and play a role in strongly fixing the part 6.

[0034] Preferably, the clamping member 2 in the present invention comprises a clamping arm 2-1 and a clamping cylinder 2-2, and the clamping arm 2-1 is controlled to rotate and clamp the fixing part 6 by the clamping cylinder 2-2.

[0035] In one embodiment of the present invention, Figure 4-6 As shown, the positioning pin 3 includes an outer pin 3-1 and an inner pin 3-2. The outer wall of the outer pin 3-1 is limited on the pin mounting plate 3-3. The outer pin 3-1 includes two or more outer pin bodies 3-11. The outer pin bodies 3-11 form an inner pin 3-2 accommodating space with equal upper and lower diameters. The top of the inner pin 3-2 is set between the outer pin bodies 3-11. The top of the inner pin 3-2 is set as a cone 3-21 that is narrow at the top and wide at the bottom. When the inner pin 3-2 rises, the inner pin enters the distance between the outer pin bodies 3-11 through the inner pin. As the distance between the inner pins 3-2 and the outer pins 3-1 increases, the outer pin bodies 3-11 move outward, increasing the overall outer diameter of the outer pins 3-1 until the outer pins 3-1 are interference fit with the positioning holes to achieve the positioning of the part 6. When the inner pins 3-2 move downward, the outer pin bodies 3-11 lose the pressure from the inside to the outside and can move inward, thereby reducing the outer diameter of the outer pins 3-1. The part 6 can move up and down according to loading and unloading. A positioning cylinder 3-4 is provided at the bottom of the inner pins 3-2, and the inner pins 3-2 are driven up and down by the positioning cylinder 3-4.

[0036] Preferably, a limiting groove 3-111 is provided on the outer surface of the outer pin body 3-11, and the limiting groove 3-111 cooperates with the inner edge of the mounting groove 3-31 in the middle of the pin mounting plate 3-3, so that the upward and downward movement of the positioning pin 3 is limited by the pin mounting plate 3-3, so that the outer pin 3-1 is always limited to the same horizontal height, and the limiting groove 3-111 can limit the maximum outer diameter of the outer pin 3-1.

[0037] Preferably, a reset sleeve 3-5 is provided on the outer side of the inner pin 3-2, a slide groove 3-51 is provided on the reset sleeve 3-5, a limit screw 3-52 matching with the slide groove 3-51 is provided on the inner pin 3-2, the reset sleeve 3-5 is fixed on the cutting bracket 1, the limit screw 3-52 moves up and down with the inner pin 3-2, and the up and down travel of the inner pin 3-2 is limited by the cooperation of the slide groove 3-51 and the limit screw 3-52.

[0038] The present invention uses a positioning pin 3 with a variable diameter to cooperate with the positioning hole. The positioning pin 3 drives the inner pin 3-2 to rise and fall through the positioning cylinder 3-4, thereby controlling the diameter of the outer pin 3-1 to increase or decrease, and the diameter change range is 1mm. When the semi-finished product is in the upper and lower parts, the outer pin 3-1 is in a reduced state. At this time, there is a 0.5mm gap between the semi-finished product aperture and the pin, and there is no obstruction between the upper and lower parts. After the proximity switch 4-4 senses that the semi-finished product is placed in place, the positioning cylinder 3-4 of the positioning pin 3 drives the inner pin 3-2 to rise while the clamping part 2 is clamped, and the outer pin 3-1 expands, so that the positioning pin 3 is tightly combined with the positioning hole to ensure the positioning effect of the semi-finished part 6, and the strong magnet 5-1 is pushed upward to approach the part 6, and the part 6 is fixed by the strong magnet 5-1.

[0039] In one embodiment of the present invention, Figure 7 As shown, a sensing rod 4-2 which can slide up and down and automatically reset is arranged between the proximity switch 4-4 and the part 6. Specifically, a sensing rod guide sleeve 4-21 is arranged on the top of the proximity switch protection box 4-1. The top end of the sensing rod 4-2 passes through the sensing rod guide sleeve 4-21 and can slide up and down. A return spring 4-22 is arranged in the middle of the sensing rod 4-2. The top end of the return spring 4-22 is connected to the side wall of the sensing rod 4-2, and the bottom end of the return spring 4-22 is connected to the inner wall of the proximity switch protection box 4-1. When the part 6 is installed, the part 6 presses the sensing rod 4-2 downward, and the return spring 4-22 is compressed at this time. When the part 6 is disassembled, the sensing rod 4-2 is reset by the return spring 4-22.

[0040] Preferably, a proximity switch base 4-3 is provided at the bottom of the proximity switch protection box 4-1, and the proximity switch protection box 4-1 and the proximity switch 4-4 are fixed on the proximity switch base 4-3 through a proximity switch mounting plate 4-31.

[0041] Preferably, a felt pad 4-11 is provided at the position where the signal line and the sensing rod 4-2 pass through the proximity switch protection box 4-1, and the position where the signal line and the sensing rod 4-2 pass through is dust-proofed by the felt pad 4-11. Specifically, the felt pad 4-11 can be provided between the sensing rod 4-2 and the sensing rod guide sleeve 4-21, and can also be provided between the proximity switch 4-4 and the proximity switch mounting plate 4-31.

[0042] The proximity switch 4-4 and the part 6 rely on a sensing rod 4-2 that can slide up and down as a displacement transmission. After the part 6 is placed on the cutting bracket 1, the part 6 presses the sensing rod 4-2 down, and the sensing rod 4-2 approaches the proximity switch 4-4. When the part 6 is in place, the sensing rod 4-2 reaches a position that can be sensed by the proximity switch 4-4, triggering the proximity switch 4-4 signal, and the signal light representing the position lights up, indicating that the position is in place.

[0043] In one embodiment of the present invention, Figure 7 As shown, the magnetic fixing unit 5 includes a strong magnet 5-1 and a fixed cylinder 5-2. The strong magnet 5-1 is installed on the top of the fixed cylinder 5-2. The fixed cylinder 5-2 drives the strong magnet 5-1 to rise, and fixes the part 6 through the strong suction force of the strong magnet 5-1. The fixed cylinder 5-2 is started to drive the strong magnet 5-1 to descend, and the suction between the strong magnet 5-1 and the part 6 is released.

[0044] Preferably, the strong magnet 5-1 is arranged in a copper magnet sliding guide sleeve 5-11 and can slide up and down in the magnet sliding guide sleeve 5-11. The magnet sliding guide sleeve 5-11 is fixed on the mounting base 5-3 on the cutting bracket 1, and the magnet sliding guide sleeve 5-11 guides the strong magnet 5-1.

[0045] Preferably, an aluminum magnet mounting seat 5-12 is provided at the bottom of the strong magnet 5-1, the top of the magnet mounting seat 5-12 is fixedly connected to the strong magnet 5-1, and a return pull ring 5-13 is provided at the bottom of the magnet mounting seat 5-12. The return pull ring 5-13 is clamped with the T-head at one end of the push rod 5-15, and the other end of the push rod 5-15 is fixedly connected to the output end of the fixed cylinder 5-2 through the cylinder connecting nut 5-14. The strong magnet 5-1 is connected to the fixed cylinder 5-2 through the magnet mounting seat 5-12, the return pull ring 5-13 and the push rod 5-15.

[0046] Preferably, a layer of anti-skid rubber pad 5-4 is installed between the strong magnet 5-1 and the product, and the anti-skid rubber pad 5-4 fits tightly with the part 6. The function of the anti-skid rubber pad 5-4 is to increase the friction between the part 6 and the positioned strong magnet 5-1, so that the product positioning is more stable.

[0047] The magnetic fixing unit 5 provided in the present invention is provided with a strong magnet 5-1. When the part 6 is cut, the strong magnet 5-1 moves upward under the action of the fixing cylinder 5-2 to approach and attract the part 6, and the part 6 is fixed by the attraction between the magnet and the part 6. When the cutting is completed, the strong magnet 5-1 is separated from the part 6 through the fixing cylinder 5-2, so that the part is easily removed from the fixture.

Claims

1. A high-precision hot-formed parts laser cutting fixture, characterized in that: It includes a cutting bracket, a clamping piece installed between the cutting parts, a positioning pin, a sensing component and a magnetic fixing unit. The positioning pin can change its diameter according to the positioning hole on the part. The sensing component is provided with a proximity switch and a proximity switch protection box. The magnetic fixing unit includes a strong magnet that can absorb the part. The positioning pin includes an outer pin and an inner pin, the outer wall of the outer pin is limited on the pin mounting plate, the outer pin includes two outer pin bodies, the top of the inner pin is arranged between the outer pin bodies, the top of the inner pin is arranged as a cone with a narrow top and a wide bottom, and a positioning cylinder is arranged at the bottom of the inner pin; A limit groove is arranged on the outer surface of the outer pin body, and the limit groove matches with the inner edge of the mounting groove in the middle of the pin mounting plate; a reset sleeve is arranged on the outer side of the inner pin, and a slide groove is arranged on the reset sleeve; and a limit screw matching with the slide groove is arranged on the inner pin; A felt pad is provided at the position where the signal line and the sensing rod pass through the proximity switch protection box; A non-slip rubber pad is installed between the strong magnet and the product.

2. A high-precision hot-formed parts laser cutting fixture according to claim 1, characterized in that: The magnetic fixing unit includes a strong magnet and a fixing cylinder, and the strong magnet is installed on the top of the fixing cylinder.

3. The high-precision hot-formed parts laser cutting fixture according to claim 1, characterized in that: The strong magnet is arranged in a copper magnet sliding guide sleeve and can slide up and down in the magnet sliding guide sleeve, and the magnet sliding guide sleeve is fixed on a mounting base on the cutting bracket.

4. A high-precision hot-formed parts laser cutting fixture according to claim 3, characterized in that: An aluminum magnet mounting seat is provided at the bottom of the strong magnet, the top of the magnet mounting seat is fixedly connected to the strong magnet, and a return pull ring is provided at the bottom of the magnet mounting seat. The return pull ring is clamped with the T-head at one end of the push rod, and the other end of the push rod is fixedly connected to the output end of the fixed cylinder through a cylinder connecting nut.

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