Composite mold and stamping process for asbestos gaskets for ignition engines

Abstract

This invention discloses a composite mold and stamping method for asbestos gaskets used in ignition engines. The asbestos gasket mold can simultaneously complete the punching of the inner hole and the blanking of the outer diameter of the gasket. The specific mold structure includes: a lower mold base; a lower mold backing plate and a protective mold sleeve; a die; an ejector and a compression spring; an ejector rod; a punch base; a punch; a backing plate and screws; a mold shank; an ejector rod; an upper mold plate; a top plate and a push rod; and a stop pin. This mold structure enables simultaneous punching of the inner hole and blanking of the outer diameter of the gasket, resulting in asbestos gaskets with high dimensional accuracy, flatness, and good appearance quality. It is a high-quality and efficient processing method for producing asbestos gaskets. Compared with machining processes, it offers superior quality and higher efficiency.

Description

Technical Field

[0001] This invention belongs to the field of asbestos gasket processing, specifically relating to a composite mold for asbestos gaskets used in ignition engines and a stamping processing method. Background Technology

[0002] Currently, asbestos sheets are widely used in the manufacturing of solid rocket engines. Ignition engine seals utilize asbestos sheets to make gaskets for sealing the air passages. Asbestos gaskets are lightweight and offer good sealing performance. However, due to their thin material and small difference between the inner and outer diameters, asbestos gaskets are easily deformed during processing, resulting in large burrs. Conventional machining methods cannot achieve good flatness, and even asbestos gaskets with acceptable appearance quality cannot guarantee dimensional tolerances. The main drawbacks are: 1) small gasket dimensions, especially narrow planes used for sealing; 2) soft clamping material during machining, leading to easy deformation; 3) deformation of the inner and outer diameters during machining, resulting in large burrs and flash; and 4) low efficiency of conventional machining methods, suitable only for small-batch production, unable to handle large-scale production, and inconsistent dimensional accuracy and quality among individual pieces. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing conventional machined asbestos gaskets, such as deformation of the inner hole and outer circle, large burrs and flash, low efficiency, inability to complete large-scale production, and inconsistent dimensional accuracy and quality of each piece. This invention provides a composite mold and stamping method for efficient and high-quality batch processing of asbestos gaskets.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0005] A composite mold for asbestos gaskets in ignition engines, comprising:

[0006] Lower mold base;

[0007] The lower die pad is fixed on the lower die base. Multiple stop pins are installed on the upper end of the lower die pad. A protective die sleeve for protecting the cutting edge of the die cavity is installed on the lower die pad.

[0008] Die;

[0009] The die cavity is fixed to the punch seat, the backing plate, and the upper template in sequence by the first screw. The upper template has a die handle at the top and a first ejector rod inside the die handle. The cavity at the bottom of the upper template has a top plate that abuts against the lower end of the first ejector rod. The die cavity is used to blank the outer circle of the asbestos gasket under the downward pressure of the first ejector rod.

[0010] punch;

[0011] The upper end of the punch is embedded in the positioning groove at the top of the punch seat, and the top surface of the punch is in contact with the bottom surface of the pad. A push rod is provided through the middle of the punch and the pad. The upper end of the push rod is embedded in the positioning groove at the top of the pad, and the top surface of the push rod abuts against the bottom surface of the top plate. The punch is used to punch the inner hole of the asbestos gasket under the downward pressure of the first push rod and the push rod. The push rod is used to eject the punching residue while punching the inner hole of the asbestos gasket, so as to separate the part from the residue.

[0012] Ejector;

[0013] The ejector is installed between the die and the punch. The top of the ejector is provided with a second ejector rod that passes through the pad and the punch seat. A compression spring is sleeved on the second ejector rod between the ejector and the punch seat. The ejector can unload the asbestos gasket by means of the compression and rebound of the compression spring.

[0014] Preferably, the cutting edge height of the die is 1 mm lower than that of the punch, and both maintain a sharp edge.

[0015] Preferably, the outer wall of the die edge is conical and the inner wall is cylindrical, serving as a guide section for the outer wall of the ejector.

[0016] Preferably, the ejector's ejector working surface is a plane, and its height is flush with the cutting edge of the die.

[0017] Preferably, the outer wall of the punch cutting edge is cylindrical, and the inner wall cutting edge is conical, with a through hole inside. The push rod can move up and down in the through hole to eject the punching residue.

[0018] Preferably, the cavity depth at the bottom of the upper template is greater than the sum of the thickness of the punching washer and the thickness of the backing plate, and the perpendicularity between the center of the mold and the upper end face of the upper template is less than φ0.02mm.

[0019] Preferably, the lower end of the punch seat has an opening for limiting the compression spring, and the compression amount of the compression spring is twice the punching thickness of the asbestos gasket.

[0020] Preferably, the ejector and the stop pin are arranged correspondingly in the vertical direction.

[0021] Preferably, when the upper die assembly of the composite mold is punching the strip, the concave die is made of annealed aluminum plate, which can complete the rapid punching of asbestos gaskets.

[0022] A stamping process for a composite mold for an asbestos gasket used in an ignition engine includes the following steps:

[0023] S1: Install the composite mold onto the press and tighten the mold handle;

[0024] S2: Place the stamping strip at the stop pin, start the press, and the upper die assembly moves downward with the press flywheel. The die first presses the strip and completes the punching of the outer circle of the washer. After the punching is completed, the ejector presses the edge of the punched round material, and then the punch moves down to complete the punching of the center hole of the punched round material. The punched material is separated from the washer and ejected by the push rod.

[0025] S3: Remove and separate the excess material from the outer circle and the center hole of the washer to obtain the punched asbestos washer.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] 1) The present invention provides a composite mold structure for asbestos gaskets for ignition engines, which can simultaneously complete the stamping of the inner hole and outer circle of the gasket. The asbestos gaskets obtained by the stamping process have good flatness, small deformation, high dimensional accuracy, and no burrs or flash.

[0028] 2) A composite mold structure for asbestos gaskets for ignition engines can efficiently complete the processing and production of a large number of gaskets, and each piece has high dimensional accuracy and excellent quality stability and consistency.

[0029] 3) The advantages of using a composite mold for stamping asbestos gaskets are: the composite mold can simultaneously stamp the inner hole and outer diameter of the gasket, resulting in a simple process, high material utilization, reduced production costs, and shorter production cycles. This method belongs to the field of asbestos gasket processing technology and has excellent application prospects in the production of sealing components in the aerospace industry. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the composite mold structure for asbestos gaskets.

[0031] Figure 2 This is a schematic diagram of the planar structure of the processed asbestos gasket.

[0032] Figure 3 This is a schematic diagram of the cross-sectional structure of the processed asbestos gasket.

[0033] In the diagram: 1-Lower mold base; 2-Lower mold pad; 3-Protective mold sleeve; 4-Die; 5-Ejector; 6-Compression spring; 7-Ejector rod; 8-Punch base; 9-Punch; 10-Pad; 11-First screw; 12-Mold shank; 13-Second screw; 14-First ejector rod; 15-Upper mold plate; 16-Pin; 17-Second ejector plate; 18-Push rod; 19-Stop pin; 20-Asbestos washer; δ-Asbestos washer thickness; d-Inner diameter of asbestos washer; D-Outer diameter of asbestos washer. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The following is in conjunction with the appendix Figure 1-3 The embodiments of the present invention will be described in further detail below.

[0036] Example 1

[0037] Prepare an asbestos gasket 20 with a thickness of 1mm, an inner diameter of 22mm, and an outer diameter of 26mm.

[0038] like Figure 1 An embodiment of a composite mold structure for an asbestos gasket for an ignition engine, as shown, includes:

[0039] Lower mold base 1;

[0040] The lower die pad 2 is fixed to the lower die base 1 by bolts, and three stop pins 19 are installed at the upper end. The protective die sleeve 3 is installed on the lower die pad 2 for the protection of the cutting edge of the die 4.

[0041] Die 4;

[0042] The concave die 4 is fixed to the punch seat 8, the backing plate 10, and the upper template 15 by the first screw 11, and is used to blank the outer circle of the asbestos gasket.

[0043] Punch 9;

[0044] The punch 9 and the punch seat 8 are fixedly installed through the positioning groove. The pressure of the punch press is transmitted through the first ejector rod 14, the top plate 17, the second ejector rod 18, and the pad plate 10 to complete the punching of the inner hole of the asbestos gasket.

[0045] Ejector 5;

[0046] Ejector 5 is installed between the inner wall of die 4 and the outer wall of punch 9, and unloads the asbestos gasket by means of the compression and rebound of the spring.

[0047] Putter 18;

[0048] Under the action of the first push rod 14 and the top plate 17, the push rod 18 punches the inner hole of the asbestos gasket and ejects the punching residue, thereby separating the part from the residue.

[0049] The die 4, ejector 5, punch 9, and push rod 18, under the action of die shank 12 and first ejector 14, synchronously stamp the washer to complete the punching, blanking, and ejection process. The die shank 12 is fixed to the top of the upper template 15 by the second screw 13.

[0050] The height difference between the cutting edge of the die 4 and the cutting edge of the punch 9 is 1mm, and both maintain a sharp edge.

[0051] The outer wall of the cutting edge of the die 4 is conical, and the inner wall is cylindrical, serving as the guide section for the outer wall of the ejector 5.

[0052] Ejector 5 is installed between die 4 and punch 9. Its ejection working surface is a plane and its height is flush with die 4.

[0053] The outer wall of the punch 9 is cylindrical, and the inner wall is conical. It has a through hole, and the push rod 18 moves up and down in the hole to eject the excess material from the punch hole.

[0054] After the punching is completed, the push rod 18 moves upward under the elastic force of the compression spring 6, which drives the pad 10 to return the push rod 18 fixed on the pad 10 to its original position.

[0055] The upper template 15, backing plate 10, top plate 17, punch seat 8, and die 4 are positioned by locating pins 16 and fixed together by the first screw 11 to form the upper mold assembly.

[0056] The compression spring 6 is installed at the lower end of the second push rod 7. The lower end of the punch seat 8 has a hole for limiting the compression spring 6. The compression amount of the compression spring 6 is twice the punching thickness of the asbestos gasket.

[0057] The upper template 15 has a hole at its lower end, and the top plate is installed in the hole. The hole depth is greater than the sum of the thickness of the punching washer and the thickness of the backing plate. The perpendicularity between the center of the mold and the upper end face of the upper template 15 is less than φ0.02mm.

[0058] When the composite upper die assembly is used to punch strips, the die is made of annealed aluminum plate, which can complete the rapid punching of asbestos gaskets.

[0059] The washer punching die is mounted on a press, and the die shank is tightened. The ejector pin inside the die ejects the excess material. The stroke of the punch and die completes the punching of the washer.

[0060] In the stamping process, a 1mm thick and 36mm wide asbestos strip is placed at the stop pin. The press is started, and the upper die assembly moves downward with the press flywheel. The die 4 first presses down on the strip and completes the punching of the outer circle of the washer. After the punching is completed, the ejector 5 presses down on the edge of the punched round material, and then the punch 9 moves down to complete the punching of the center hole of the punched round material. The punched material is separated from the washer and ejected by the push rod 18.

[0061] like Figure 2 and3 As shown, the asbestos gasket removal steps involve separating the excess material from the outer circle and the center hole of the gasket to obtain a punched asbestos gasket with a thickness of 1mm, an inner diameter of φ22mm, and an outer circle of φ26mm.

[0062] Example 2

[0063] Prepare asbestos gaskets with a thickness of 2mm, an inner diameter of 90mm, and an outer diameter of 96mm.

[0064] like Figure 1 The embodiment of the composite mold structure for an asbestos gasket for an ignition engine shown includes:

[0065] Lower mold base 1;

[0066] The lower die pad 2 is fixed to the lower die base 1 by bolts, and three stop pins 19 are installed at the upper end. The protective die sleeve 3 is installed on the lower die pad 2 for the protection of the cutting edge of the die 4.

[0067] Die 4;

[0068] The die 4 is fixed to the punch seat 8, the backing plate 10, and the upper template 15 by the first screw 11, and is used to blank the outer circle of the asbestos gasket.

[0069] Punch 9;

[0070] The punch 9 and the punch seat 8 are fixedly installed through the positioning groove. The pressure of the punch press is transmitted through the first ejector rod 14, the top plate 17, the second ejector rod 18, and the pad plate 10 to complete the punching of the inner hole of the asbestos gasket.

[0071] Ejector 5;

[0072] Ejector 5 is installed between the inner wall of the die 4 and the outer wall of the punch 9, and unloads the asbestos gasket by means of the compression and rebound of the spring.

[0073] Putter 18;

[0074] Under the action of the first push rod 14 and the top plate 17, the push rod 18 punches the inner hole of the asbestos gasket and ejects the punching residue, thereby separating the part from the residue.

[0075] Under the action of the die 4, ejector 5, punch 9, and push rod 18, the die 4, ejector 5, punch 9, and push rod 18 simultaneously punch the gasket to complete the punching, blanking, and ejection process.

[0076] The height difference between the cutting edge of the die 4 and the cutting edge of the punch 9 is 1mm, and both maintain a sharp edge.

[0077] The outer wall of the cutting edge of the die 4 is conical, and the inner wall is cylindrical, serving as the guide section for the outer wall of the ejector 5.

[0078] Ejector 5 is installed between die 4 and punch 9. Its ejection working surface is a plane and its height is flush with die 4.

[0079] The outer wall of the punch 9 is cylindrical, and the inner wall is conical. It has a through hole, and the push rod 18 moves up and down in the hole to eject the excess material from the punch hole.

[0080] After the punching is completed, the push rod 18 moves upward under the elastic force of the compression spring 6, which drives the pad 10 to return the push rod 18 fixed on the pad 10 to its original position.

[0081] The upper template 15, backing plate 10, top plate 17, punch seat 8, and die 4 are positioned by locating pins 16 and fixed together by the first screw 11 to form the upper mold assembly.

[0082] The compression spring 6 is installed at the lower end of the second push rod 7. The lower end of the punch seat 8 has a hole for limiting the compression spring 6. The compression amount of the compression spring 6 is twice the punching thickness of the asbestos gasket.

[0083] The upper template 15 has a hole at its lower end, and the top plate is installed in the hole. The hole depth is greater than the sum of the thickness of the punching washer and the thickness of the backing plate. The perpendicularity between the center of the mold and the upper end face of the upper template 15 is less than φ0.02mm.

[0084] When the composite upper die assembly is used to punch strips, the die is made of annealed aluminum plate, which can complete the rapid punching of asbestos gaskets.

[0085] The washer punching die is mounted on a press, and the die shank is tightened. The ejector pin inside the die ejects the excess material. The stroke of the punch and die completes the punching of the washer.

[0086] In the stamping process, a 2mm thick and 106mm wide asbestos strip is placed at the stop pin. The press is started and the upper die assembly moves downward with the press flywheel. The die (4) first presses the strip and completes the punching of the outer circle of the washer. After the punching is completed, the ejector (5) presses the edge of the punched round material, and then the punch (9) moves downward to complete the punching of the center hole of the punched round material. The punched material is separated from the washer and ejected by the push rod (18).

[0087] like Figure 2 and 3 As shown, the asbestos gasket removal steps involve separating the excess material from the outer circle and the center hole of the gasket to obtain a punched asbestos gasket with a thickness of 2mm × φ90mm (inner diameter) × φ96mm (outer circle).

[0088] The advantages of using a composite mold for stamping asbestos gaskets are: the composite mold can simultaneously stamp the inner and outer diameters of the gasket, resulting in a simple process, high material utilization, reduced production costs, and shorter production cycles. This method belongs to the field of asbestos gasket processing technology and has excellent application prospects in the production of sealing components in the aerospace industry.

[0089] This mold structure enables simultaneous punching of the inner hole and blanking of the asbestos gasket, resulting in asbestos gaskets with high dimensional accuracy, flatness, and good appearance quality. It is a high-quality and efficient processing method for producing asbestos gaskets. Compared with machining processes, it offers superior quality and higher efficiency.

[0090] Based on the description and drawings of this invention, those skilled in the art can easily manufacture or use the composite mold and stamping method for asbestos gaskets for ignition engines of this invention, and can achieve the positive effects described in this invention.

[0091] Unless otherwise specified, in this invention, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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, the terms used to describe orientation or positional relationships in this invention are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0092] Unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0093] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A composite mold for an asbestos gasket in an ignition engine, characterized in that, include: Lower mold base (1); The lower die pad (2) is fixed on the lower die base (1). Multiple stop pins (19) are installed on the upper end of the lower die pad (2). A protective die sleeve (3) for protecting the cutting edge of the die cavity (4) is installed on the lower die pad (2). Die (4); The die (4) is fixed to the punch (8), the backing plate (10), and the upper template (15) in sequence by the first screw (11). The upper template (15) is provided with a mold handle (12) at the top. The mold handle (12) is provided with a first ejector rod (14). The cavity at the bottom of the upper template (15) is fitted with a top plate (17) that abuts against the lower end of the first ejector rod (14). The die (4) is used to blank the outer circle of the asbestos gasket under the downward pressure of the first ejector rod (14). The cutting edge height of the die (4) is 1mm lower than that of the punch (9), and both maintain a sharp edge. When the upper die assembly of the composite mold is punching the strip, the die (4) is made of annealed aluminum plate, which can complete the rapid punching of the asbestos gasket. punch (9); The upper end of the punch (9) is embedded in the positioning groove at the top of the punch seat (8). The top surface of the punch (9) is in contact with the bottom surface of the pad (10). A push rod (18) is provided through the middle of the punch (9) and the pad (10). The upper end of the push rod (18) is embedded in the positioning groove at the top of the pad (10). The top surface of the push rod (18) abuts against the bottom surface of the top plate (17). The punch (9) is used to punch the inner hole of the asbestos gasket under the downward pressure of the first push rod (14) and the push rod (18). The push rod (18) is used to punch the inner hole of the asbestos gasket while punching the inner hole of the asbestos gasket, so as to separate the part from the waste material. Ejector (5); The ejector (5) is installed between the die (4) and the punch (9). The top of the ejector (5) is provided with a second ejector rod (7) that passes through the pad (10) and the punch seat (8). A compression spring (6) is sleeved on the second ejector rod (7) between the ejector (5) and the punch seat (8). The ejector (5) can unload the asbestos gasket by means of the compression and rebound action of the compression spring (6). The stamping process for composite dies used in ignition engines for asbestos gaskets includes the following steps: S1: Install the composite mold onto the press and tighten the mold handle; S2: Place the stamping strip at the stop pin, start the press, and the upper die assembly moves downward with the press flywheel. The die (4) first presses the strip and completes the punching of the outer circle of the washer. After the punching is completed, the ejector (5) presses the edge of the punched round material, and then the punch (9) moves downward to complete the punching of the center hole of the punched round material. The remaining material after punching is separated from the washer and ejected by the push rod (18). S3: Remove and separate the excess material from the outer circle and the center hole of the washer to obtain the punched asbestos washer.

2. The composite mold for asbestos gaskets in ignition engines according to claim 1, characterized in that: The outer wall of the die (4) is conical and the inner wall is cylindrical, serving as a guide section for the outer wall of the ejector (5).

3. The composite mold for asbestos gaskets in ignition engines according to claim 1, characterized in that: The ejector (5) has a flat ejector surface, and its height is flush with the cutting edge of the die (4).

4. The composite mold for asbestos gaskets in ignition engines according to claim 1, characterized in that: The outer wall of the punch (9) is cylindrical, and the inner wall is conical. It has a through hole, and the push rod (18) can move up and down in the through hole to eject the punching residue.

5. The composite mold for asbestos gaskets in ignition engines according to claim 1, characterized in that: The cavity depth at the bottom of the upper template (15) is greater than the sum of the thickness of the punching washer and the thickness of the pad (10), and the perpendicularity between the center of the mold and the upper end face of the upper template (15) is less than φ0.02mm.

6. The composite mold for asbestos gaskets in ignition engines according to claim 1, characterized in that: The lower end of the punch seat (8) has an opening for limiting the compression spring (6), and the compression amount of the compression spring (6) is twice the punching thickness of the asbestos gasket.

7. The composite mold for asbestos gaskets in ignition engines according to claim 1, characterized in that: The ejector (5) and the stop pin (19) are arranged correspondingly in the vertical direction.

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