CN1247109A - Steerer tube forming method for long tube body - Google Patents

Abstract

A method for forming a vertical tube of a bicycle handlebar by drawing a tube body. The present invention provides a bicycle handlebar forming method which has the advantages of complete appearance, high strength, no derivation of a large amount of waste materials during forming, time and labor saving and low cost, and the method comprises the steps of placing a material block in a male die and a female die to perform forging forming of a prototype body, placing the prototype body in the male die and the female die, drawing out a solid part to form the prototype body with a tube body section, placing the prototype body in the female die to perform stamping forming to form the prototype body with a rear head section provided with connected lugs and slotted holes, drilling a hole on the front head section, cutting off excess materials, cutting open slots on the rear head section to form two lugs, and drilling holes on two sides of the lugs.

Description

Steerer tube forming method for long tube body

The invention belongs to a method for manufacturing bicycle parts, in particular to a method for forming a handlebar standpipe of a bicycle with an elongated pipe body.

Commonly used bicycle handlebar vertical tubes can be roughly divided into two categories: integrally forged and welded. The former has the advantages of complete appearance, solid strength and no need for surface treatment due to its integral molding. However, in this system, the solid block material is gradually punched and forged into a hollow pipe body and the back end. That is, after hollow punching and forging of solid blocks, a lot of derivative wastes will inevitably be generated, which not only wastes a lot of raw materials, but also causes manufacturers to be deeply troubled by subsequent waste disposal. The latter is to weld the front head section and the back head section at both ends of a pipe body respectively, and then form the handle standpipe through surface treatments such as polishing and baking varnish. Handlebar risers formed in this way. Although it is not derived from waste materials, it is not only labor-intensive and time-consuming to form, but also has poor structural strength.

The object of the present invention is to provide a bicycle handlebar stem tube forming method that not only has a complete product appearance and high strength, but also avoids generating a large amount of waste materials, saves time and labor, and is low in cost.

The present invention comprises the steps:

step one

In order to forge the first prototype body of the standpipe by matching the selected material block with the first male and female molds; the front and rear ends of the first female mold are respectively provided with enlarged notches and conical chambers; the enlarged notches are used to form hand The outer wall of the front head section of the standpipe is formed into two convex parts; the tapered chamber is used to form the prototype of the handle standpipe body and the rear head section; There is a small arc convex part, and a small column block is extended at the front end of the stage column; when forging, the block material is placed in the first female mold, and the material block is pushed by the first male mold stage column After punching and forging, the material block fills the mold-shaped hole of the first female mold, gradually forming the first prototype body of the vertical pipe which is shorter but has the shape of the front section of the vertical pipe of the handle.

step two

In order to put the first prototype body of the standpipe into the second male and female molds to elongate the pipe body; the shape of the second female mold is the same as the lower part of the first female mold; the second male mold has a long rod column; the long rod column The diameter corresponds to the diameter of the slot on the first prototype of the vertical pipe; when forging, the first prototype of the vertical pipe is placed in the second female mold, and the middle of the first prototype of the vertical pipe is solidified by the second male mold. The section is elongated to form a second prototype body of the standpipe having a desired pipe length.

step three

In order to put the second prototype body of the vertical pipe into the third male and female molds to forge the rear head section; the end of the third female mold is provided with a mold hole corresponding to the shape of the rear head section of the vertical pipe; Put it in the third female mold, and use the third male mold to make the rear section of the second prototype body of the standpipe punch and forge to fill the die hole of the third female mold, and gradually form the rear section with connected ears and slots. The third rudimentary body of the vertical pipe in the shape of a head.

step four

In order to drill keyholes on the positive end surfaces of the two convex parts of the outer wall of the front head section respectively; cut off the thin layered material at the bottom of the slot hole in the back section of the third prototype of the vertical pipe, make the slot hole pass through to form a through hole, and connect the lugs Cut the open groove so that the connected lugs are cut into two lugs, and finally drill keyholes on both sides of the two lugs.

in:

The material block is in the shape of a block, and the required material can be accurately calculated according to the shape hole of the first master mold.

The diameter of the step rod of the first male mold must be slightly smaller than the diameter of the material block, so that when the step rod squeezes the material block, the material block can be divided towards the two sides first, so as to form the outer wall of the front head section of the handle vertical pipe first. Two protrusions.

The bottom surface of the slot on the first prototype body of the vertical pipe must be lower than the surface of the second female mold, and has a height difference S.

Step 3 still requires the help of auxiliary male die, auxiliary bump and push rod; the auxiliary male die is provided with a center through hole with reaming at the end; the auxiliary bump is in a step shape corresponding to the end reaming of the auxiliary male die and the central through hole Bump; when implementing the third step, first install the auxiliary bump plug on the end of the auxiliary male mold, and use the slot hole of the second prototype body of the standpipe to cover the auxiliary male mold laterally; and extend the auxiliary male mold with the push rod In the central through hole of the mold and pushed towards the end of the auxiliary male mold for demoulding.

When implementing the third step, a thin layer of residual material remains at the bottom of the slot hole of the rear section of the third prototype body of the standpipe, so as to avoid direct contact between the third male mold and the third female mold.

Because the present invention includes the forging and molding of the first prototype body of the standpipe with the first male and female molds of the material block; the first prototype of the vertical pipe is placed in the second male and female molds, and the vertical pipe is formed by the second male mold. The middle solid part of the first prototype is elongated to form the second blank of the vertical tube with the expected body section; the second blank of the vertical tube is placed sideways in the third female mold, and the vertical tube is made the second blank by the third male mold. The rear part of the second prototype body is punched and forged into the third prototype body of the standpipe in the shape of the back section head with connected ears and slots; the front head section is drilled, the remaining material is cut off, and the opening groove is cut at the back head section to form two ears and a groove. Drill holes on both sides of the lug in four steps. When forming and manufacturing bicycle handlebar vertical pipes, not only the advantages of complete appearance and high strength of conventional forged products can be retained, but also because the pipe body is formed by drawing and forming instead of the conventional method of gradually punching and forging out of solid blocks to form a hollow shape The pipe body section and the required materials can be accurately calculated according to the mold hole of the first master mold, thereby avoiding a large amount of waste, saving time and labor, and low cost.

Fig. 1, is the schematic perspective view of the vertical pipe structure of the bicycle handle made by the present invention.

Fig. 2 is a schematic front view of Step 1 of the present invention.

Fig. 3 is a schematic rear view of Step 1 of the present invention.

Fig. 4 is a schematic front view of Step 2 of the present invention.

Fig. 5 is a schematic rear view of Step 2 of the present invention.

Fig. 6 is a schematic front view of Step 3 of the present invention.

Fig. 7 is a schematic rear view of Step 3 of the present invention.

Fig. 8 is a schematic diagram of demoulding in Step 3 of the present invention.

Fig. 9 is a schematic perspective view of the structure of the half-finished bicycle handlebar standpipe manufactured by the present invention.

The present invention will be further elaborated below in conjunction with the accompanying drawings.

As shown in Figure 1, the front, middle and rear are respectively the front head section 11, the pipe body section 12 and the rear head section 13 of the bicycle handlebar standpipe 1, and its forming method includes four steps:

step one

In order to match the selected aluminum material block 10 with the first male and female molds 21 and 22, the first prototype body 10A of the standpipe is forged and formed. As shown in FIG. 2 , the front and rear ends of the first female mold 22 are respectively provided with an enlarged notch 221 and a tapered chamber 222 . The enlarged notch 221 is used to form two protrusions 111 on the outer wall of the front head section 11 of the handle standpipe, and the tapered chamber 222 is used to form the prototype body of the handle standpipe body section 12 and the rear head section 13 . The first male mold 21 has step poles 211 , and has smaller arc protrusions 212 on both sides of the step portion of the step poles 211 , and a smaller pillar block 213 extending from the front end of the step poles 211 . During forging, the block material 10 is placed in the first female mold 22 . As shown in Figure 3, by pushing the material block 10 through the 21st stage rods 211 of the first male die, the material block 10 is punched and forged to fill the die-shaped hole of the first female die 22, gradually forming a shorter but already There is a first prototype body 10A of a standpipe in the shape of the front section 11 of the handlebar standpipe.

In the above steps, the material block 10 is in the shape of a block, and the required material can be accurately calculated according to the shape of the hole of the first female mold 22 . The diameter of the step rod 211 of the first male mold 21 must be slightly smaller than the diameter of the material block 10, so as to ensure that when the step rod 211 first squeezes the material block 10, the material block 10 can be divided toward both sides first. , to first form the two protrusions 111 of the outer wall of the front head section 11 of the handle standpipe, so that the process of extruding the block 10 is smoother.

step two

In order to put the above-mentioned vertical pipe first prototype body 10A into the second male and female molds 31 and 32, the pipe body section 12 is elongated and formed. As shown in FIG. 4 , the shape of the second female mold 32 is the same as that of the lower part of the first female mold 22 . The second male mold 31 has a long rod 311 . The diameter of the long rod 311 corresponds to the diameter of the slot 101A on the blank 10A. When forging, place the first prototype body 10A of the standpipe in the second female mold 32 , and make its upper front section 11 exposed outside the second female mold 32 . As shown in FIG. 5 , the middle solid part 102A of the first blank body 10A of the vertical tube is squeezed by the long rod column 311 of the second male mold 31 corresponding to the slot 101A on the first blank body 10A of the vertical tube. The elongation forms the second standpipe prototype body 10B having the desired pipe body section 12 .

In the above steps, the bottom surface 103A of the slot 101A on the first prototype body 10A of the standpipe must be lower than the surface of the second female mold 32, and have a height difference S, so as to ensure that the second male mold 31 can be pushed and pulled out smoothly. The overall length of standpipe pipe section 12 is expected.

step three

In order to put the above-mentioned vertical pipe second prototype body 10B into the third male and female molds 41 and 42, and carry out the forging and molding of the posterior head section 13 by means of the auxiliary male mold 43, the auxiliary bump 44 and the push rod 45. As shown in FIG. 6 , the end of the third female mold 42 is provided with a mold hole 421 corresponding to the shape of the rear head section 13 of the vertical pipe. The auxiliary male die 43 is provided with a central through hole with a reamed hole, and the reamed hole is located at the end. The outer periphery of the auxiliary protrusion 44 is a step-shaped protrusion corresponding to the enlarged hole at the end of the auxiliary male mold 43 and the central through hole. The diameter of the push rod 45 is smaller than the diameter of the central through hole on the auxiliary male die 43 . During forging, as shown in Figure 6, the auxiliary projection 44 is plugged into the end of the auxiliary male die 42, and the slot 101B of the second prototype body 10B of the vertical pipe is laterally sleeved outside the auxiliary male die 43, and the vertical pipe The second blank body 10B is placed laterally in the third female mold 42 . As shown in FIG. 7 , by means of the die hole 421 of the third male die 41 and the third female die 42, the rear section of the second blank body 10B of the standpipe is punched and forged to fill the die hole 421 of the third female die 42, gradually A third prototype body 10C of the vertical tube in the shape of the rear head section 13 having the connected ear piece 101C and the slot hole 102C is formed. Then, as shown in FIG. 8 , the push rod 45 is inserted into the central through hole of the auxiliary male mold 43 and pushed toward the end of the auxiliary male mold 43 to demould the third prototype body 10C of the standpipe as shown in FIG. 9 .

In the above-mentioned steps, the bottom of the slot 102C of the rear section head 13 of the third prototype body 10C of the standpipe still retains a thin layer of residual material 103C, so as to avoid direct contact between the third male mold 41 and the third female mold 42. cause mold damage.

step four

In order to partially trim the above-mentioned third prototype body 10C of the vertical pipe; and drill keyholes on the positive end faces of the two convex parts 111 of the outer wall of the front head section 11; cut off the bottom thin layer of the slot hole 102C of the rear head section 13 of the third blank body 10C of the vertical pipe Shape surplus material 103C, make the slot 102C pass through to form the through hole 131, and cut the opening groove 132 on the connected ear piece 101C, so that the connected ear piece 101C is cut into two lug pieces 133, and finally drill on both sides of the two ear pieces 133 The lock hole 134 is formed into the bicycle handlebar standpipe 1 as shown in FIG. 1 .

In the above steps, the front head section 11 is locked on the handlebar of the bicycle by means of the locking piece and the locking piece. The through hole 131 formed after the cut-off of the bottom thin-layered residual material 103C of the rear section head 13 is set on the bicycle vertical pipe, and the rear head section 13 is locked with the bicycle vertical pipe by means of bolts screwed in the locking holes 134 of the two lugs 133. Fixed connection.

When forming and manufacturing bicycle handlebar vertical pipes according to the present invention, not only the advantages of complete appearance and high strength of conventional forged products can be retained, but also because the tube body section 12 is formed by drawing and forming instead of the conventional method of gradually punching and forging out of solid blocks. The hollow pipe body section and the required materials can be accurately calculated according to the mold-shaped hole of the first master mold, thereby avoiding a large amount of waste, saving time and labor, and low cost.

Claims (6)

1, a kind of bicycle handlebar standpipe forming method of elongated pipe stature, is characterized in that it comprises the following steps: step one In order to forge the first prototype body of the standpipe by matching the selected material block with the first male and female molds; the front and rear ends of the first female mold are respectively provided with enlarged notches and conical chambers; the enlarged notches are used to form hand The outer wall of the front head section of the standpipe is formed into two convex parts; the tapered chamber is used to form the prototype of the handle standpipe body and the rear head section; There is a small arc convex part, and a small column block is extended at the front end of the stage column; when forging, the block material is placed in the first female mold, and the material block is pushed by the first male mold stage column After punching and forging, the material block fills the mold-shaped hole of the first female mold, gradually forming the first prototype body of the vertical pipe which is shorter but has the shape of the front section of the vertical pipe of the handle. step two In order to put the first prototype body of the standpipe into the second male and female molds to elongate the pipe body; the shape of the second female mold is the same as the lower part of the first female mold; the second male mold has a long rod column; the long rod column The diameter corresponds to the diameter of the slot on the first prototype of the vertical pipe; when forging, the first prototype of the vertical pipe is placed in the second female mold, and the middle of the first prototype of the vertical pipe is solidified by the second male mold. The section is elongated to form a second prototype body of the standpipe having a desired pipe length. step three In order to put the second prototype body of the vertical pipe into the third male and female molds to forge the rear head section; the end of the third female mold is provided with a mold hole corresponding to the shape of the rear head section of the vertical pipe; Put it in the third female mold, and use the third male mold to make the rear section of the second prototype body of the standpipe punch and forge to fill the die hole of the third female mold, and gradually form the rear section with connected ears and slots. The third rudimentary body of the vertical pipe in the shape of a head. step four In order to drill keyholes on the positive end surfaces of the two convex parts of the outer wall of the front head section respectively; cut off the thin layered material at the bottom of the slot hole in the back section of the third prototype of the vertical pipe, make the slot hole pass through to form a through hole, and connect the lugs Cut the open groove so that the connected lugs are cut into two lugs, and finally drill keyholes on both sides of the two lugs. 2. The bicycle handlebar standpipe forming method according to claim 1, characterized in that said material blocks are in the shape of strips, and the required materials can be precisely formed according to the shape and hole of the first master mold. Calculated. 3. According to claim 1 or 2, the method for forming a bicycle handlebar standpipe with elongated pipe body, is characterized in that the diameter of the step pole of the first male mold must be slightly smaller than the diameter of the material block, so that the step When the rod column extrudes the material block, the material block can be divided towards both sides first, so as to form two convex parts on the outer wall of the front head section of the handle standpipe. 4. According to claim 1 or 2, the bicycle handlebar vertical tube forming method for elongated tube body is characterized in that the bottom surface of the slot on the first prototype body of the vertical tube must be lower than the surface of the second female mold, And has a height difference S. 5. According to claim 1 or 2, the bicycle handlebar standpipe forming method for elongated pipe body is characterized in that the third step still needs to use auxiliary male dies, auxiliary bumps and push rods; the auxiliary male dies are set There is a central through hole with reaming at the end; the auxiliary bump is a stepped bump corresponding to the reaming hole at the end of the auxiliary male die and the central through hole; when implementing the third step, first install the auxiliary bump plug on the auxiliary male die The end of the vertical pipe second prototype body is laterally sleeved outside the auxiliary male mold with the slot hole; and the push rod is inserted into the central through hole of the auxiliary male mold and pushed toward the end of the auxiliary male mold to demould. 6. The bicycle handlebar standpipe forming method according to claim 1 or 2, characterized in that in the implementation of the third step, in the rear section head slot of the third prototype body of the standpipe Bottom still retains thin laminar rest material, to avoid the direct contact of the 3rd male mold and the 3rd female mold.

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