JP2005153810A - Method for manufacturing side member for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a side member of a chassis frame by molding it by a metal mold while coping with requirement for increase/decrease of height of cross section. <P>SOLUTION: A pattern including the neighborhoods to vertical ends 11a, 11b of cross sections of a group of holes 15-19 classified in a vertical direction of the cross section every in usage of holes provided on upper and lower flanges 12, 13 and a web 14 at the whole area in a longitudinal direction of the side member is made common in a plurality kinds of vehicles. At machining of the side member 11, predetermined group of holes (18, 19, etc.) from one vertical end of a blank 100 for the side member to the other end are firstly machined, feed pitch of the blank 100 is changed in response to required length of the web 14 of the side member to carry out the feeding and thereafter machining of the remained group of holes (15-17', etc.) and cutting of the end are carried out. Since the side members having different height of cross section can be manufactured by the same blank mold, the cost of metal mold is outstandingly reduced and exchange of the metal mold is not required to become high production operation ratio. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a manufacturing method in which a side member in a chassis frame for trucks can be mainly molded with the same mold in accordance with a request for increase / decrease in cross-sectional height.

  As shown in FIG. 3, a truck generally uses a ladder chassis frame 1 in which two parallel side members 2 and 2 ′ are connected by a plurality of cross members 3. However, the strength and rigidity required for the side members 2 and 2 'are different depending on the load capacity, wheel base, application, destination, and the like. There are various types of holes formed in the side members 2 and 2 '.

  In this case, if there is a large difference in the required performance, (1) change the sectional height of the side member, (2) change the thickness of the side member, (3) implement reinforcement to the side member, etc. However, (1) has the largest contribution to performance change, but conventionally, a blank mold corresponding to the variety of the holes is required for each cross-sectional height. Mold costs were incurred, leading to a significant increase in side member costs.

For this reason, the adoption of the above (2) or (3) is considered, but (2) has a large increase in cost and weight compared to an increase in strength and rigidity due to an increase in plate thickness. In many cases, the relatively small cost increase (3) is adopted. However, the mold cost for molding the side member reinforcing material is still necessary, and the processing and assembling costs of the reinforcing material are required.
Therefore, the present inventor has reached the present invention as a result of conducting research while refocusing on the above (1), which has the greatest contribution to performance change among the required performance.
JP 2002-012164 A

  The hole of the side member extends a. A hole for fastening the cross member, fastening a bodywork, etc. b. Holes for attaching heavy objects such as fuel tanks, c. There are brake piping and control wiring fixing holes, molding location holes, etc. Generally, the above-mentioned a is above and below the web on the lower flange on the U-shaped cross section of the side member ( A hole for fastening a cross member of the above b and a is provided on the side near the upper and lower flanges, and c is provided in the center of the web as a group of holes.

  The problem to be solved by the present invention is to provide a manufacturing method in which a side member in a chassis frame can be molded with the same mold in response to a request for increase or decrease in cross-sectional height.

  The present invention relates to a hole group classified according to use in the longitudinal direction of the cross section among holes formed in the upper and lower flanges and the web in the entire longitudinal direction of the vehicle side member, including at least the vicinity of the longitudinal end portion of the cross section. A pattern is made common to a plurality of vehicle types, and when processing a side member, a predetermined group of holes from one longitudinal end to the other end of the side member blank is processed in advance, A method for producing a side member for a vehicle, characterized in that the blank feed pitch is changed according to the required length of the member web, and then the remaining hole group is processed and the end is cut. .

  The method for manufacturing a vehicle side member according to the present invention includes at least a longitudinal section of a cross section of a group of holes classified by use in the longitudinal direction of the cross section among holes formed in the upper and lower flanges and the web in the entire longitudinal direction of the vehicle side member. The pattern including the vicinity of the direction end is shared by a plurality of vehicle types, and when processing the side member, a predetermined hole group from the one end to the other end in the vertical direction of the side member blank is preceded. After processing, the blank feed pitch is changed according to the required length of the side member web, and then the remaining hole group is processed and the end is cut. , Side members with different cross-sectional heights can be manufactured with the same blank mold, which leads to a significant reduction in mold costs, and there is no need to replace the mold in the press machine as in the past.働率 can be improved greatly. In addition, even when the design is changed such as the addition of holes or the movement of the drilling position, at least one mold needs to be remodeled, so that the cost of remodeling the mold can be greatly reduced.

  The preferred embodiment of the present invention will be described with reference to FIGS. 1 to 2. In the vehicle side member manufacturing method of the present invention, holes formed in the upper and lower flanges 12, 13 and the web 14 in the entire longitudinal direction of the vehicle side member 11. Among the hole groups 15 to 19 classified according to applications in the longitudinal direction of the cross section, the pattern including the vicinity of at least the longitudinal end portions 11a and 11b of the cross section is shared by a plurality of vehicle types, and the side members 11 In processing, a predetermined hole group (for example, 18 and 19) from one longitudinal end to the other end of the side member blank 100 is processed in advance, and then the necessary length of the web 14 of the side member is obtained. Depending on the length, the blank 100 is fed at a different feed pitch, and then the remaining hole group (for example, 15 to 17 ′) is processed and the end is cut. That.

The embodiment will be described in more detail with reference to FIG. 1 showing a plan view for planing and FIG. 2 showing a sectional view of a side member after molding.
The vehicle side member shown in FIGS. 1 and 2 is manufactured by fastening the upper and lower flanges 12 and 13 of a plurality of types of vehicle side members to the members at the upper portion 14a and the center portion 14b of the web 14 therebetween. The patterns of the mounting hole groups 15 and 19 and 16 to 17 'are made common, and when processing the side member, the same kind as the above of the lower flange corresponding portion 13' and the web lower portion corresponding portion 14c 'in the side member blank 100 is used. After the holes 19 and 18 are processed in advance, the blank member 100 is fed at a different feed pitch according to the required length of the web 14 of the side member, and the remaining hole groups 15 to 17 ′). And cutting the end.

  1 and FIG. 2, the breakdown of the arrangement of the hole groups 15 to 19 includes, as described above, the hole group 15 for fastening the cross member 3, fastening of the bodywork, and the like as the upper flange 12 (A part) and In the upper part 14a (B part) of the web 14, the same hole group 19 is provided in the lower flange 13 (E), and the hole groups 16 and 18 for attaching heavy objects such as a fuel tank are provided in the upper part 14a ( B portion) and 14c (D portion), a brake piping and control wiring fixing hole group 17, a molding location hole 17 'and the like are further arranged in the central portion 14b (C portion) of the web 14. ing.

  In FIGS. 1 and 2, X and Y represent the upper and lower ends of the product or the upper and lower ends of the blank 100, and Z represents a cross-sectional length change line at the boundary between the C and D portions. If the feed pitch is made wider in the direction C than the Z line, the web-corresponding portion of the blank 100 becomes larger and the cross-sectional height can be increased.

  The example shown in FIGS. 1 and 2 is a large and long press product such as a side frame of an automobile, but the present invention is not limited to such a large article, and a member such as a reinforcing material is used for the side frame. It can be applied to products whose dimensions change in a certain direction by changing.

It is a partial plan view explanatory drawing of the side frame for vehicles concerning the present invention. It is sectional drawing of the side frame for vehicles by this invention. It is a perspective view of the chassis frame for vehicles which should apply the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ladder-type chassis frame 2, 2 ', 11 Side member 3, 3' Cross member 12 Upper flange 13 Lower flange 14 Web 15-19 Hole group 100 Blank X Product or blank upper end Y Product or blank lower end Z Section Length change line.

Claims (3)

  Among the holes formed in the upper and lower flanges and the web in the entire longitudinal direction of the vehicle side member, a plurality of patterns including at least the vicinity of the longitudinal end portion of the cross section of the hole group classified by use in the vertical direction of the cross section In common with the vehicle model, when processing a side member, a predetermined group of holes from one end to the other end in the vertical direction of the side member blank is processed in advance, and then the web of the side member is processed. A method for manufacturing a side member for a vehicle, wherein the blank is fed while changing the feed pitch according to the required length, and then the remaining hole group is processed and the end is cut.   2. The side member for a vehicle according to claim 1, wherein the hole group for sharing the pattern is for the upper and lower flanges of the side member and the upper and central portions of the web between them. Method. The vehicle side according to claim 1 or 2, wherein the hole group to be processed in advance is intended for a portion corresponding to a lower flange portion and a web lower portion portion of the side member blank. How to make a member.

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