Production process of lock decorative cover inner cover

Abstract

The invention discloses an inner cover of a lock decorative cover, and particularly relates to a production process of the inner cover of the lock decorative cover, which comprises the following steps of: selecting a plate as a blank, punching a circular raw material with a corresponding size by using a punching machine according to the size of the inner cover, and forming a gourd-shaped inner hole inside the circular raw material after the circular raw material is punched by a punching device, a square limiting ring is formed in the inner hole in a stamping mode. And finally, the circular raw material is stretched and shaped into the inner cover, an existing production technology of the lock decorative cover inner cover is perfected, the lock decorative cover inner cover produced through the technology does not need to be manually pasted with a plastic film, time and labor are saved, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to a lock accessory, and more particularly to a production process of a lock decorative cover and inner cover. Background Art

[0002] The existing lock decorative cover inner cover is generally first blanked by stamping and then stretched to obtain a finished product. When the lock decorative cover inner cover is installed on the lock decorative cover, it is necessary to stick a plastic film on the inside of the inner cover, and then dig a positioning square hole in the center of the plastic film to facilitate the positioning of the door lock square bar for subsequent installation. This method requires manual sticking of the plastic film, which is time-consuming and labor-intensive, and the production efficiency is also slow and urgently needs to be improved. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a production process for the inner cover of the lock decorative cover. The inner cover of the lock decorative cover produced by this process does not need to be manually affixed with plastic film, which saves time and labor and greatly improves production efficiency.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a production process for a lock decorative cover inner cover, the process comprising the following steps:

[0005] 1) A sheet material is selected as a blank, and a punching device is used to punch out a circular blank of corresponding size according to the diameter of the inner cover of the decorative cover. After being punched by the punching device, the circular blank has a gourd-shaped inner hole, a square limiting ring is punched into the inner hole, and connecting strips extending to both sides of the inner hole are punched into the ends of the limiting ring. In addition, two symmetrical first tooth grooves are punched into the outer side of the circular blank;

[0006] 2) The round raw material after stamping is subjected to a second stamping. The purpose of the second stamping is to punch out a second tooth groove on the upper and lower sides of the connection between the two connecting strips and the inner hole, so that the limit ring can be easily separated from the fixed fall of the inner hole by external force;

[0007] 3) Punching holes in the circular raw material after secondary stamping, including two fixing holes located on both sides of the inner hole and a mounting hole located directly above the inner hole;

[0008] 4) The punched circular raw material is subjected to a first stretching operation so that the circular raw material can be formed into an inner cover, wherein a horizontal limiting area is formed at the upper end of the inner cover, and the mounting hole is located at the center of the limiting area for fixing and connecting the lock decorative cover;

[0009] 5) The inner cover is subjected to secondary stretching to form two cylindrical protrusions on the outer surface of the inner cover, and the two cylindrical protrusions are located on both sides of the inner hole;

[0010] 6) tapping the two cylindrical protrusions to form internal threads on the inner sides of the cylindrical protrusions to facilitate connection and fixing of the lock;

[0011] 7) The inner cover after secondary stretching is subjected to a punching process so that a downwardly protruding limiting protrusion is formed on the bottom of the cover body, so as to stably fix the inner cover in the lock decorative cover.

[0012] Beneficial effects of the present invention: The present invention improves the existing production process of the lock decorative cover inner cover. The lock decorative cover inner cover produced by this process does not need to be manually pasted with plastic film, which saves time and labor and greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0014] Figure 2 The structure of the present invention is schematically shown Figure 2 .

[0015] 1. Inner cover; 10. Inner hole; 2. Limiting ring; 20. Connecting strip; 21. Second tooth groove; 3. First tooth groove; 4. Fixing hole; 5. Mounting hole; 6. Cylindrical protrusion; 60. Internal thread; 7. Limiting protrusion. DETAILED DESCRIPTION

[0016] Reference Figure 1 and Figure 2 The embodiments of the present invention are further described.

[0017] The present invention discloses a production process for a lock decorative cover inner cover, which comprises the following steps:

[0018] 1) A sheet material is selected as a blank, and a circular blank of corresponding size is punched out using a punching device according to the diameter of the inner cover 1 of the lock decorative cover. After being punched by the punching device, a gourd-shaped inner hole 10 is formed inside the circular blank. A square limiting ring 2 is also punched into the inner hole 10. Connecting strips 20 extending to both sides of the inner hole 10 are punched into the ends of the limiting ring 2. In addition, two symmetrical first tooth grooves 3 are punched into the outer side of the circular blank;

[0019] 2) The round raw material after stamping is subjected to a second stamping. The purpose of the second stamping is to stamp out the second tooth grooves 21 on the upper and lower sides of the connection between the two connecting strips 20 and the inner hole 10, so that the limit ring 2 can be easily separated from the fixed inner hole 10 by external force;

[0020] 3) Punching the circular raw material after the secondary stamping, including two fixing holes 4 located on both sides of the inner hole 10 and a mounting hole 5 located directly above the inner hole 10;

[0021] 4) The punched circular material is subjected to a first stretching operation to form an inner cover 1 . A horizontal limiting area is formed at the upper end of the inner cover 1 , and the mounting hole 5 is located at the center of the limiting area for fixing and connecting the lock decorative cover.

[0022] 5) The inner cover 1 is subjected to secondary stretching to form two cylindrical protrusions 6 on the outer surface of the inner cover 1. The two cylindrical protrusions 6 are located on both sides of the inner hole 10;

[0023] 6) tapping the two cylindrical protrusions 6 so that internal threads 60 are formed on the inner sides of the cylindrical protrusions 6 to facilitate connection and fixing of the lock;

[0024] 7) The inner cover 1 after secondary stretching is subjected to a punching process so that a downwardly protruding limiting protrusion 7 is formed on the bottom of the cover body, so as to stably fix the inner cover 1 in the lock decorative cover.

[0025] Through the above 7 steps, a complete lock decorative cover inner cover 1 can be obtained. Figure 1 The inner cover 1 is shown as a circular shape with an inner hole 10 in the middle. A retaining ring 2 is provided in the inner hole 10. The connecting strip 20 of the retaining ring 2 is punched with an indentation groove 21. When the square strip is installed, the retaining ring 2 can be easily removed by shaking it up and down. This eliminates the need to manually attach the plastic film to the inner cover 1. In addition, two symmetrical first tooth grooves 3 are punched out of the outer side of the circular material so that the side cover of the inner cover 1 will not form wrinkles when the circular material is stretched, thereby achieving stable stretching and improving the yield rate.

[0026] Among them, steps 1 and 2 can use common stamping dies to stamp the plate, step 3 can use punching equipment to punch the plate, steps 4 and 5 can use stretching dies to stretch the plate, step 6 can use a tap to tap the cylindrical protrusion 6 to form an internal thread 60, and step 7 can use a punching die to punch the inner cover 1.

[0027] The present invention improves the existing production process of the lock decorative cover inner cover 1. The lock decorative cover inner cover 1 produced by this process does not need to be manually pasted with plastic film, which saves time and labor and greatly improves production efficiency.

[0028] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A production process for a lock decorative cover inner cover, characterized in that: The process includes the following steps: 1) A plate is selected as a blank, and a stamping device is used to stamp out a circular raw material of corresponding size according to the diameter of the inner cover of the lock decorative cover, and the circular raw material has a gourd-shaped inner hole after being stamped by the stamping device, and a square limit ring is also stamped in the inner hole, and connecting strips extending to both sides of the inner hole are stamped at both ends of the limit ring, and two symmetrical first tooth grooves are stamped on the outer side of the circular raw material; 2) The stamped circular raw material is subjected to secondary stamping. The purpose of the secondary stamping is to stamp out second tooth grooves on the upper and lower sides of the connection between the two connecting strips and the inner hole, so that the limit ring can be easily separated from the fixed fall of the inner hole by external force; 3) Punching holes in the circular raw material after the secondary stamping, including two fixing holes located on both sides of the inner hole and a mounting hole located directly above the inner hole; 4) The punched circular raw material is stretched for the first time so that the circular raw material can form an inner cover, a horizontal limiting area is formed on the upper end of the inner cover, and the mounting hole is located at the center of the limiting area for fixing and connecting the lock decorative cover; 5) The inner cover is subjected to secondary stretching to form two cylindrical protrusions on the outer side of the inner cover, and the two cylindrical protrusions are located on both sides of the inner hole; 6) tapping the two cylindrical protrusions so that internal threads are formed on the inner sides of the cylindrical protrusions to facilitate connection and fixing of the lock; 7) The inner cover after secondary stretching is subjected to a punching process so that a downwardly protruding limiting convex point is formed at the bottom of the cover body, so as to stably fix the inner cover in the lock decorative cover.

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