TWI671143B - Manufacturing method of transmission tube - Google Patents

Abstract

A method for manufacturing a transmission tube suitable for a lock. The lock includes a first handle group and a second handle group, which are respectively installed on opposite sides of the door piece and connected by a transmission pipe. The manufacturing method includes obtaining a first cylindrical workpiece extending in an axial direction, forming a first guide hole at a first end of the first cylindrical workpiece, and extending the first guide hole in the axial direction by a first depth to A first extension hole is formed. The first cylindrical workpiece is extended into a second cylindrical workpiece in the axial direction during the extension process, a second guide hole is formed at the second end of the second cylindrical workpiece, and the second guide hole is extended in the axial direction by the second Depth to form a second extension hole. The second cylindrical workpiece is extended into a third cylindrical workpiece in the axial direction during the extension process, and the first extension hole and the second extension hole communicate with the third cylindrical workpiece to form a transmission tube.

Description

Manufacturing method of transmission tube

The invention relates to a method for manufacturing a transmission tube, and more particularly, to a method for manufacturing a transmission tube suitable for a lock.

Lock is a mechanism product that is widely used in daily life. Generally speaking, the lock includes a first handle group on one side of the door plate, a second handle group on the other side of the door plate, and a transmission tube connected and capable of selectively rotating the two. In the past, when manufacturing a transmission tube, a tubular prototype workpiece was usually heated to a temperature higher than the recrystallization temperature of the workpiece material. After the plasticity of the workpiece was improved, the workpiece was processed to a predetermined shape and size by means of forging or stamping. However, in the above-mentioned processing method, when cutting a required length, burrs are easily generated and difficult to handle, and when the workpiece is returned to normal room temperature, local thermal stress is easily generated, which reduces the service life of the workpiece. In addition, the processor needs to accurately calculate the size of the workpiece that changes due to the thermal expansion of the material when it returns to normal temperature. It is a technical problem for transmission tubes that require a high degree of dimensional accuracy, and the bumps required for the structure of the transmission tube must be Performing secondary processing (such as welding) will add additional manufacturing costs.

The invention provides a method for manufacturing a transmission tube suitable for a lock, which can be applied to cold forging forming technology, reduces burrs during cutting and residual thermal stress of a workpiece after processing, and enables The size is similar to the predetermined size. In addition, the bumps required for the transmission tube can be formed in the forging die, so there is no need for secondary processing, which can reduce costs and improve manufacturing quality.

The manufacturing method of the present invention is applicable to a transmission tube of a lock. The lock includes a first handle group and a second handle group. The first handle group and the second handle group are respectively installed on opposite sides of a door panel and connected by a transmission tube. The manufacturing method includes obtaining a first cylindrical workpiece extending along an axial direction; forming a first guide hole at a first end of the first cylindrical workpiece; A first depth is axially extended to form a first extension hole; the first cylindrical workpiece is axially extended into a second cylindrical workpiece during the extension process, and a second cylindrical workpiece is formed at a second end of the second cylindrical workpiece. A second guide hole; and extending the second guide hole of the second cylindrical workpiece in the axial direction by a second depth to form a second extension hole; the second cylindrical workpiece is axially extended during the extension process to A third cylindrical workpiece and a first extension hole and a second extension hole that communicate with the third cylindrical workpiece to form a transmission tube.

In an embodiment of the present invention, obtaining the first cylindrical workpiece further includes obtaining a prototype workpiece with an original length, and straightening the prototype workpiece in the axial direction to form a first cylindrical workpiece extending in the axial direction.

In an embodiment of the present invention, obtaining the first cylindrical workpiece further includes forging a prototype workpiece having an original length into the first cylindrical workpiece, so that the cross-section of the first cylindrical workpiece is substantially a square and the first column The shaped workpiece has a first length.

In an embodiment of the present invention, obtaining the first cylindrical workpiece further includes forming a rounded corner around one end of the prototype workpiece.

In an embodiment of the invention, the manufacturing method further includes forming a guiding angle around the second end of the first cylindrical workpiece.

In an embodiment of the present invention, the cross-section of the first cylindrical workpiece has a first side length, and an aperture of the first guide hole is smaller than the first side length of the cross-section of the first cylindrical workpiece.

In an embodiment of the present invention, during the extension process, the first cylindrical workpiece is axially extended into a second cylindrical workpiece having a second length, and the cross-section of the second cylindrical workpiece has a second side length. The second length is greater than the first length, and the second side length is greater than the first side length.

In an embodiment of the present invention, during the extension process, the second cylindrical workpiece is axially extended into a third cylindrical workpiece having a third length, and a cross-section of the third cylindrical workpiece has a third side length. The third side is longer than the second side.

In an embodiment of the present invention, the cross section of the transmission pipe has a fourth side length, wherein the fourth side length is greater than the third side length.

In an embodiment of the invention, the manufacturing method further includes forging the transmission tube to form a bump on the outer edge of the tube wall of the transmission tube.

Based on the above, the manufacturing method of the present invention can forge the transmission tube of the lock during the cold forging process. Since the processing temperature is kept below the recrystallization temperature of the material, the amount of dimensional change caused by thermal expansion is extremely low, making the workpiece after processing It has a size close to the predetermined size. In addition, after processing, the workpiece can maintain a smooth appearance without deburring, and the thermal stress accumulated in the material due to processing is also significant. Lowering helps to extend the life of the transmission tube. The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the drawings.

10‧‧‧Lock

100‧‧‧ Transmission tube

110‧‧‧ prototype workpiece

120‧‧‧First cylindrical workpiece

130‧‧‧Second cylindrical workpiece

140‧‧‧ the third cylindrical workpiece

A‧‧‧ axis

B‧‧‧ bump

D ₁ ‧‧‧ first depth

D ₂ ‧‧‧Second Depth

D ₃ ‧‧‧ third depth

DH ₁ ‧‧‧ first extension hole

DH ₂ ‧‧‧ second extension hole

E ₁ ‧‧‧ the first end

E ₂ ‧‧‧ second end

G‧‧‧Leading angle

GH ₁ ‧‧‧First guide hole

GH ₂ ‧‧‧Second Guide Hole

J‧‧‧ Aperture

L ₀ ‧‧‧ original length

L ₁ ‧‧‧ first length

L ₂ ‧‧‧ second length

L ₃ ‧‧‧ third length

R‧‧‧ fillet

S ₁ ‧‧‧First side length

S ₂ ‧‧‧Second side length

S ₃ ‧‧‧ Third side length

S ₄ ‧‧‧ Fourth side length

S ₁₁₀ , S ₁₂₀ , S ₁₃₀ , S ₁₄₀ , S ₁₅₀ , S ₁₆₀ , S ₁₇₀ , S ₁₈₀ , S ₁₉₀ ‧‧‧ steps

W‧‧‧Width

FIG. 1 is a schematic view of a lock set combined with a transmission tube manufactured using the manufacturing method of the present invention.

FIG. 2 is (A) a front view and (B) a side view of a prototype workpiece in an embodiment of the manufacturing method of the present invention.

Figure 3 is (A) front view and (B) side view of the prototype workpiece when a rounded corner is formed around the prototype workpiece.

Fig. 4 is a front view (A) and a side view (B) of the first cylindrical workpiece.

Fig. 5 is a front view (A) and a side view (B) of a second cylindrical workpiece.

Fig. 6 is (A) a front view and (B) a side view of a third cylindrical workpiece.

Fig. 7 is a front view (A) and a side view (B) of the transmission pipe.

FIG. 8 is a front view (A) and a side view (B) of the transmission tube when a bump is formed on the outer edge of the tube wall of the transmission tube.

Fig. 9 is a flowchart showing the steps of the manufacturing method of the present invention.

The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, or rear, are only directions referring to the attached drawings. Therefore, the directional terminology used is intended to be illustrative, and not to limit the present invention. In addition, for the convenience of identification, in the following embodiments, the same or similar elements will be given the same or similar reference numerals.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a lock set combined with a transmission tube 100 made using the manufacturing method of the present invention. As shown in FIG. 1, the lock 10 includes a transmission tube 100, a first handle group 200, and a second handle group 300, wherein the first handle group 200 and the second handle group 300 are respectively installed on a door (not shown). The opposite sides are connected by a transmission tube 100. In order to clearly show the connection relationship between the transmission tube 100, the first handle group 200, and the second handle group 300, components such as a bolt, a spring and the like other than the above-mentioned components in the lock 10 are omitted in the figure. In addition, in this embodiment, the first handle group 200 is, for example, an inside handle. The lock knob 10 mechanism can be activated by rotating the lock button on the handle, so that the second handle group 300 as the outside handle is locked or relative to the lock center. Idling to achieve the purpose of locking.

Please refer to FIG. 2 and FIG. 3. FIG. 2 is an (A) front view and (B) a side view of the prototype workpiece 110 in an embodiment of the manufacturing method of the present invention. (A) A front view and (B) a side view of the prototype workpiece 110 when a rounded corner is formed around it. The manufacturing method of the present invention is applicable to cold forging technology. First, a prototype workpiece 110 is obtained with an original length L ₀ . Since the straightness of the prototype workpiece 110 needs to be calibrated, the prototype workpiece 110 needs to be straightened along an axis A, so that the straightness of the prototype workpiece 110 meets the requirements, and a rounded corner R is formed around one end of the prototype workpiece 110 to facilitate Subsequent processing.

Please refer to FIG. 4, which is a front view (A) and a side view (B) of the first cylindrical workpiece 120. When a rounded corner R is formed around one end of the prototype workpiece 110, the prototype workpiece 110 having the original length L ₀ can be placed in a mold, and forged at a processing temperature below the recrystallization temperature to form a first cylindrical workpiece. 120. As shown in FIG. 4, the cross-section of the first cylindrical workpiece 120 is substantially a square, and has a first side length S ₁ . In this embodiment, the first side length S _{1 is,} for example, 7.40 mm and is similar to the diameter of the prototype workpiece 110, but the present invention does not limit this. In addition, the first cylindrical workpiece 120 has a first length L ₁ , wherein the first length L _{1 is} smaller than the original length L ₀ , and then a first guide hole is formed at a first end E _{1 of the} first cylindrical workpiece 120. GH ₁ to facilitate subsequent extension processing, where an aperture J of the first guide hole GH ₁ is smaller than the first side length S ₁ of the cross section of the first cylindrical workpiece 120. In this embodiment, the aperture J is 5.60, for example. Mm. On the other hand, a rounded corner R has been formed around one end of the prototype workpiece 110 (now the second end E ₂ of the first cylindrical workpiece 120) by preliminary processing. At this time, another processing can be performed. A guide angle G is formed around the second end E ₂ to facilitate subsequent processing.

Please refer to FIG. 5, which is (A) a front view and (B) a side view of the second cylindrical workpiece 130. When a first end of the first cylindrical workpiece ₁ E first guide hole 120 is formed after _a GH, a first guide hole 120 of the first cylindrical workpiece ₁ along the axial direction A GH extension a first depth D ₁ To form a first extension hole DH ₁ , and the first cylindrical workpiece 120 is extended into a second cylindrical workpiece 130 along the axial direction A during the extension process. In this embodiment, the first depth D _{1 is,} for example, 23.4 Millimeters, and since the first depth D ₁ is not too large relative to the first length L ₁ , no excessive processing stress is generated. It is worth mentioning that during the extension process, the first length L ₁ is stretched to the second length L ₂ , and the first side length S ₁ of the cross section of the first cylindrical workpiece 120 is enlarged to the second cylindrical shape. The second side length S ₂ of the cross section of the workpiece 130, wherein the second length L _{2 is} greater than the first length L ₁ , and the second side length S _{2 is} greater than the first side length S ₁ . In this embodiment, the second side length S _{2 is,} for example, 7.51 mm. On the other hand, since the steering angle of a previously formed around the first cylindrical workpiece G in the second end 120 of the E _2, and thus can easily be cylindrical workpiece at a second end of the second E ₂ 130 is formed a second Guide hole GH ₂ to facilitate subsequent processing.

Please refer to FIG. 6, which is (A) a front view and (B) a side view of the third cylindrical workpiece 140. When the second end 130 of the second cylindrical piece E ₂ form a second guide hole GH _2, may be a second cylindrical workpiece of the second guide hole 130 in the axial direction A reverse GH ₂ a second extension depth D ₂ to form a second extension hole DH ₂ , and the second cylindrical workpiece 130 is extended to a third cylindrical workpiece 140 along the axial direction A in the process of reverse extension. In this embodiment, the second depth D _{2 is,} for example, 25.2 mm, and since the second depth D ₂ is not too large with respect to the second length L ₂ , no excessive processing stress is generated. It is worth mentioning that during the reverse extension process, the second length L ₂ is stretched to the third length L ₃ , and the first extension hole DH ₁ is also extended from the original first depth D ₁ to the third length L ₃ . Three depths D ₃ and the second side length S ₂ of the cross section of the second cylindrical workpiece 130 is enlarged to the third side length S ₃ of the cross section of the third cylindrical workpiece 140, where the third length L _{3 is} greater than the second length L ₂ , and the third side length S _{3 is} greater than the second side length S ₂ . In this embodiment, the third depth D _{3 is,} for example, 29.1 millimeters, and the third side length S _{3 is,} for example, 7.54 millimeters. The stress is evenly distributed, and the strength of the outer wall of the third cylindrical workpiece 140 is maintained. The dimensions of the third depth D ₃ and the third side length S ₃ may be slightly changed.

Please refer to FIG. 7, which is a front view (A) and a side view (B) of the transmission tube 100. After the third cylindrical workpiece 140 has the first extension hole DH _{1 of the} third depth D ₃ and the second extension hole DH ₂ of the second depth D ₂ , the first extension hole DH of the third cylindrical workpiece 140 can be communicated. ₁ and the second extension hole DH ₂ to form the transmission tube 100. It is worth mentioning that during the connection process, the third side length S ₃ of the cross section of the third cylindrical workpiece 140 is enlarged to the fourth side length S _{4 of the} transmission tube 100, where the fourth side length S _{4 is} greater than the third Side length S ₃ . In this embodiment, the fourth side length S _{4 is,} for example, 7.57 mm.

Please refer to FIG. 8, which is a front view (A) and a side view (B) of the transmission tube 100 when a bump B is formed on the outer edge of the tube wall of the transmission tube 100. After the above-mentioned steps of forging, extension, reverse extension, and communication are completed, in order to make the transmission tube 100 easily snap into the lock 10, the transmission tube 100 may be placed in a forging die to be forged, so as to press the tube wall of the transmission tube 100 A bump B is formed on the outer edge. In this embodiment, the bump B has a width W, and the width W is, for example, 3.00 mm. By forming the bump B, the transmission tube 100 can be a hollow tube with a square cross-section with a clear engagement position, and is used as a transmission mechanism for connecting the first handle group 200 and the second handle group 300 in the lock 10.

Please refer to FIG. 9, which is a flowchart of steps in the manufacturing method of the present invention. The above steps have been shown in the flow blocks of S ₁₁₀ to S ₁₉₀ in FIG. 9, which can make the manufacturing method according to the present invention more clear.

In summary, the method for manufacturing a transmission tube suitable for a lock of the present invention uses cold forging technology to pass a prototype workpiece through steps such as straightening, guide holes, extension, reverse extension, and communication, which can avoid hot forging processing. Possible burrs, reducing local thermal stress and dimensional changes caused by thermal expansion, reducing manufacturing costs and improving the quality of the finished product.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

Claims (9)

A manufacturing method of a transmission tube suitable for a lock includes obtaining a first cylindrical workpiece, including: obtaining a prototype workpiece with an original length, straightening the prototype workpiece in an axial direction, and having the original workpiece. The prototype workpiece is forged into the first cylindrical workpiece, so that the cross-section of the first cylindrical workpiece is substantially a square, wherein the first cylindrical workpiece extends along the axial direction; A first guide hole is formed at a first end; the first guide hole of the first cylindrical workpiece is extended a first depth along the axial direction to form a first extension hole, wherein the first cylindrical shape The workpiece is extended into a second cylindrical workpiece along the axial direction during the extension process; a second guide hole is formed at a second end of the second cylindrical workpiece; the second guide of the second cylindrical workpiece The guide hole extends a second depth along the axial direction to form a second extension hole, wherein the second cylindrical workpiece is extended along the axial direction into a third cylindrical workpiece during the extension process; the third cylindrical shape is communicated with the third cylindrical workpiece. The first extension hole and the second extension hole of the workpiece to form the transmission tube; And forging the drive tube, to form a bump at the outer edge of the wall of the drive tube. The manufacturing method according to claim 1, wherein obtaining the first cylindrical workpiece further comprises: making the first cylindrical workpiece have a first length. The manufacturing method according to claim 1, wherein obtaining the first cylindrical workpiece further comprises: forming a rounded corner around one end of the prototype workpiece. The manufacturing method according to claim 1, further comprising: forming a guiding angle around the second end of the first cylindrical workpiece. The manufacturing method according to claim 1, wherein obtaining the first cylindrical workpiece further comprises: making the first cylindrical workpiece have a first length; wherein the cross-section of the first cylindrical workpiece has a first side length, In addition, an aperture of the first guide hole is smaller than a length of the first side of a cross section of the first cylindrical workpiece. The manufacturing method according to claim 5, wherein the first cylindrical workpiece is extended along the axial direction into the second cylindrical workpiece having a second length during the extension process, and a cross-section of the second cylindrical workpiece has A second side length, wherein the second length is greater than the first length, and the second side length is greater than the first side length. The manufacturing method according to claim 6, wherein the second cylindrical workpiece is extended along the axial direction into the third cylindrical workpiece having a third length during the extension process, and a cross-section of the third cylindrical workpiece has A third side length, wherein the third side length is greater than the second side length. The manufacturing method according to claim 7, wherein a cross section of the transmission pipe has a fourth side length, and the fourth side length is greater than the third side length. The manufacturing method according to claim 1, wherein forming a bump on the outer edge of the pipe wall of the transmission pipe includes the two edges of the first cylindrical workpiece parallel to the intersection of the axial direction and the square diagonal line The bumps are formed separately.